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  • 1.
    Abebe, Abay Damte
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    He, Qikang
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Foam Behavior Analysis Based On A Force Measurement System2018Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Abstract

    In the world where every sector of industrial manufacturing is being converted toautomated systems, surface finishing processes like sanding and polishing seem to lag.This phenomenon is not surprising as these processes are complex to optimize. Therehave been projects going on with the support of European Commission to findsolutions under SYMPLEXITY (Symbiotic Human-Robot Solutions for ComplexSurface Finishing Operations). One of the projects in under this include poliMATIC(Automated Polishing for the European Tooling Industry). Halmstad University isinvolved in doing projects.

    This project took a portion of this study in aim to understand a foam material’s behavior used for sanding tool at the tip of a robotic arm. This is studied using a forcemeasurement system developed at Halmstad University. The project has two sectionsand starts with one; Understanding the force measurement system and upgrading innecessary ways. Two; studying how the foam material compressive hardness propertyis affected when the material is fit with sandpaper for sanding operation using theforce measurement system. The study finally revealed how the combination of thefoam with sandpaper affects the robustness of the material, and significantlyimproved the output of the system with by reducing the noise level with 40%.

  • 2.
    Anderberg, Cecilia
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Cabanettes, Frederic
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Dimkovski, Zlate
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Liner Surface Improvements for Low Friction Piston Ring Packs2009Ingår i: Society of Tribologists and Lubrication Engineers annual meeting & exhibition 2009: Lake Buena Vista, Florida, USA, 17 - 21 May 2009, Red Hook, NY: Curran Associates, Inc., 2009, s. 455-459Konferensbidrag (Refereegranskat)
  • 3.
    Anderberg, Cecilia
    et al.
    Volvo Cars Corporation, Gothenburg, Sweden.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Thomas, Tom R.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Low friction and emission cylinder liner surfaces and the influence of surface topography and scale2019Ingår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 133, s. 224-229Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A low friction piston ring pack, with tangential load halved, was tested in engines with four different cylinder liner finishes. Oil consumption, oil temperature and liner surface temperature were monitored at different load and speed levels, under similar test conditions. The two smoother surfaces generally kept lower oil consumption compared to the two rougher ones. Results were correlated using an area-fractal analysis. The relative area of the surface was calculated at different scales and the result was compared with the level of oil consumption for the different liner surfaces at different engine speeds. It was found that oil consumption was strongly correlated with scale for areas of above 1000 μm2 and below 20 μm2.

  • 4.
    Berglund, Johan
    et al.
    Sandvik Tooling.
    Brown, Christopher A.
    Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Bay, Niels
    Department of Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark.
    Milled die steel surface roughness correlation with steel sheet friction2010Ingår i: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604, Vol. 59, nr 1, s. 577-580Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This work investigates correlations between the surface topography of milled steel dies and friction with steel sheet. Several die surfaces were prepared by milling. Friction was measured in bending under tension testing. Linear regression coefficients (R2) between the friction and texture characterization parameters were tested. None of the height, spacing, material volume, void or segmentation parameters showed good correlations. Developed area, rms surface gradient, relative area and complexity showed strong correlations (R2 > 0.7). For area-scale fractal complexity the correlation increases markedly at scales below 200 μm2, with a maximum R2 of 0.9 at 50 μm2.

  • 5.
    Bergman, Martin
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Eriksson, Lars
    Mechanical Engineering Industrial Design, Jönköping University, Jönköping, Sweden.
    Surface appearance and impression2012Ingår i: KEER 2012: Proceedings of the International Conference on Kansei Engineering and Emotion Research, KEER 2012 / [ed] Feng-Tyan Lin Ph.D., Tainan: Department of Industrial Design, National Cheng Kung University , 2012Konferensbidrag (Refereegranskat)
  • 6.
    Berrimi, Chihab Eddine
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Chaparala, Anish
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    A STUDY ON THE SURFACE TOPOGRAPHY AND DIMENSIONAL ACCURACY OF FUSED DEPOSITION MODELING: THE EFFECTS OF SURFACE ORIENTATION AND DIFFERENT PRINT SETTINGS2017Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The ease of manufacturing complex geometries using fused deposition modeling (FDM) 3D-Printing reduces the overall production cost compared with the traditional manufacturing techniques. Because of the benefits of 3D printing technologies, it is proposed to be used in the manufacturing of different products. But there is still no definite characterization of the surface quality of objects manufactured by 3D printing. Hence in order to define the texture of the surfaces produced, measurements from different samples are taken and quantified.In this study, a 3D test model consisting of various slopes is printed at different layer thicknesses and different print speeds using different 3D printers.Thus, the effect of the surface orientation on the surface roughness was studied in relation to the different layer thicknesses and different print speeds. The study samples are measured using the state of the art equipment at Halmstad University.This thesis studies the surface roughness at different slopes of FDM models.A related study on the dimensional variation between the CAD model and the actual3D printed model, and causes/reasons for the variations are analyzed.It is observed that FDM produced part surface topography is directly affected by the orientation of the surface. Also, the surface roughness increases with increase in layer thickness. The observed correlations between surface roughness and layer thickness and surface orientation could be used to better understand the behavior of FDM surfaces, thus to better quantify the surface roughness. To improve quality, it must first be quantified. It is well observed that dimensional inaccuracy exists between the CAD model and the printed part. These results suggest that there is a lot of work and improvements to be done in order to close the gap of dimensional inaccuracy and achieve a high precision commercial FDM 3Dprinting.

  • 7.
    Bååth, Lars
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Fotonik.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Towards New Interferometer Technology for Surface Metrology2012Ingår i: Proceedings of the 12th International Conference of the European Society for Precision Engineering and Nanotechnology: June 4th - 7th [8th] 2012, Stockholm, Sweden. Vol. 1 / [ed] P. Shore, H. Spaan & T. Burke, Bedford: EUSPEN , 2012, Vol. 1, s. 158-161Konferensbidrag (Refereegranskat)
    Abstract [en]

    There is an increasing requirement from manufacturing industries for improved technologies to measure surface topography. New instruments have to be accurate; robust to be used on the industry floor; non-invasive; automatic; and sufficiently fast to be used in real time as well as to simultaneously measure over a large area. The industrial applications are plenty:

    • On-line quality control of machined parts,
    • Direct feed back to the manufacturing process,
    • Analysis and selection of surface texture/structure.

    This paper presents new developments in interferometer techniques for new robust area-based topographic instruments.

  • 8.
    Cabanettes, Frederic
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Fahlgren, Lars
    Volvo Car Corporation, Gothenburg, Sweden .
    Hoerig, Torsten
    Nanofocus AG, Oberhausen, Germany.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Global and local mapping of motor blocks liners roughness for the analysis of honing performance2014Ingår i: Journal of physics, ISSN 1742-6588, Vol. 483, nr 1, artikel-id 012009Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The manufacturing and finishing (honing) of cylinder liners for the automotive industry is a constant challenge in order to reduce friction losses and oil consumption. A better knowledge of surfaces generated during plateau honing is then required for optimization of the process. Despite a well-known and controlled honing process, variations in surface roughness appear at both global (due to honing tool wear) and local (TDC, middle stroke, BDC) scales and need to be mapped and analysed. The following paper proposes to map the global and local variations in roughness by using a confocal 3D measuring equipment able to measure and scan any area of a cylinder liner. Six motor blocks (five liners each) are evaluated with twenty topography measurements per liner. In total, six hundred 3D measurements of size 1×1 mm are performed and roughness parameters are computed. The results show that some parameters do correlate with the honing tool wear specific to each cylinder. Experimental models could be built. Furthermore surface roughness varies significantly over the axial length of the liners due to waviness deviations combined with a lack of flexibility of the honing tool in axial direction. © Published under licence by IOP Publishing Ltd.

  • 9.
    Cabanettes, Frederic
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). Halmstad Univ, Sch Business & Engn, SE-30118 Halmstad, Sweden..
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Topography changes observation during running-in of rolling contacts2014Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 315, nr 1-2, s. 78-86Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The automotive industry and the design of engines are strongly ruled by performance and legislation demands. In the valve train, besides the main function (transformation of rotation to translation movements) to fulfill, new requirements in environmental demands and performance in terms of wear are leading to more and more detailed studies of the cams and rollers. Wear reduction studies for prolonging lifetime of these components require decreasing the scale of observation down to roughness. Among the different wear stages of a component, the running-in is a crucial period which will greatly influence the lifetime and performance of components. The aim of this paper is to analyze the topography variations observed during the running-in of a camshaft on a valve train rig test. A truck engine's camshaft is run under realistic conditions and 3D surfaces are measured before and after the test by using relocation techniques. By measuring the very same surfaces before and after the experiment, a deep analysis of the running-in effects on surfaces can be performed. 3D surface roughness parameters are used in parallel with new proposed methods of analysis. As a result, the mechanisms involved during running-in are emphasized and can be used for further simulations and optimization of the cam roller contact. (C) 2014 Elsevier B.V. All rights reserved.

  • 10.
    Cabanettes, Frédéric
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Alessi, Julien
    Bonomi, T.
    Faure, N.
    Mohlin, Johan
    Finnveden Powertrain, Lidköping, Sweden.
    Rosén, B-G
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK).
    Testing functional surfaces of heavy duty valve train components under realistic operating conditions2012Ingår i: 15th Nordic Symposium on Tribology, 12-15 June 2012, Trondheim, Norway, 2012Konferensbidrag (Refereegranskat)
  • 11.
    Cabanettes, Frédéric
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Anderberg, Cecilia
    Volvo Cars Corp..
    Dimkovski, Zlate
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Optimizing the Manufacturing of Driveline Surfaces Roughness Parameters and Rough Contact Modeling2009Ingår i: Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces: July 8th - 10th 2009, Rzeszów, Poland / [ed] P. Pawlus, L. Blunt, B.-G. Rosén, T. Thomas, M. Wieczorowski, H. Zahouani, Rzeszòv, Poland: Rzeszow University of Technology , 2009Konferensbidrag (Refereegranskat)
  • 12.
    Cabanettes, Frédéric
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Claret-Tournier, Julien
    Mohlin, Johan
    Nilsson, Per Henrik
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Xiao, Li
    The evolution of surface topography of injection cams2007Ingår i: Proceedings of the 11th International Conference on Metrology and Properties of Engineering Surfaces: July 17th - 20th 2007, Huddersfield, UK / [ed] Liam Blunt, Huddersfield: Huddersfield University , 2007Konferensbidrag (Refereegranskat)
  • 13.
    Cabanettes, Frédéric
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Löfgren, Hans Bertil
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Evaluation of manufacturing processes for cam/roller contact2011Konferensbidrag (Refereegranskat)
  • 14.
    Cabanettes, Frédéric
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Löfgren, Hans Bertil
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    The impact of manufacturing processes on Automotive Cam/Roller Contact2011Konferensbidrag (Refereegranskat)
  • 15.
    Cabanettes, Frédéric
    et al.
    University of Lyon, ENISE LTDS, Saint-Etienne, France.
    Rolland, Julian
    University of Lyon, ENISE LTDS, Saint-Etienne, France.
    Dumont, Florian
    University of Lyon, ENISE LTDS, Saint-Etienne, France.
    Rech, Joël
    University of Lyon, ENISE LTDS, Saint-Etienne, France.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Influence of Minimum Quantity Lubrication on Friction Characterizing Tool–Aluminum Alloy Contact2016Ingår i: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 138, nr 2, artikel-id 021107Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The possibility to reduce the amount of cutting fluids from machining processes is actively studied by the industrials and researchers. Minimum Quantity Lubrication (MQL) is a solution towards cutting fluids reduction. This article investigates the consequences on friction coefficient induced by the use of MQL. A tribometer is used in order to simulate experimentally the tribological conditions encountered during machining. As the cutting speed increases a lower amount of oil is deposited on the rough surfaces. Depending on the MQL operating conditions and sliding velocities it is plausible to reach starvation by leaving the real rough contact partly dry. A model computing a starvation percentage by filling an estimated oil amount in a deformed topography correlates with the experimental results. © 2015 by ASME

  • 16.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Characterization of Engineering Surfaces Having Linear Features2012Ingår i: Proceedings of the 2nd Seminar on Surface Metrology for the Americas, Worcester: Worcester Polytechnic Institute , 2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    There is a variety of engineering surfaces having linear scratches/grooves of different density, width and depth, some parts covered by folded metal, and some parts totally interrupted and unbalanced as a result of the machining or wear process. These grooves are critical for good function of the surface, and need to be quickly and objectively quantified for an efficient surface finish development. A suitable way to do this is to use optical 3D measurements and to combine the profile and image analysis. In this tutorial extraction and quantification of grooves/wear scratches of machined (honed and polished) and worn (honed) surfaces will be presented. In particular, it will be shown how the features, such as width, height, and distance between grooves, honing angle, balance of honing texture, and groove interrupts can be successively characterized.

  • 17.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Optimization of the Triboconditioning Process for Low Friction Surfaces2015Konferensbidrag (Refereegranskat)
  • 18.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Process Optimization of Low Friction Surfaces in Pin-Roller Contacts2014Konferensbidrag (Refereegranskat)
  • 19.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Recent R&D on Engine Cylinders2013Konferensbidrag (Övrig (populärvetenskap, debatt, mm))
  • 20.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Reduced engine friction for low climate impact2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Reducing friction in the Piston-Cylinder Unit - PCU is one of the priorities in the automotive industry as it is the largest contributor to the frictional losses and hence the fuel consumption of the internal combustion engines. Not only fuel consumption, but also the oil consumption and emissions are largely affected by the piston-ring-liner interactions. Therefore, from an optimized PCU, competitive, economic and environmental benefits would be gained.  In this project, fuel/oil consumption and emissions of car and truck engines were reduced by using different cylinder liner finishes and different ring designs/loads. Experimental and theoretical studies have been performed by simulating and testing the behaviour of various oil control rings and cylinder liner surfaces in reciprocating tribotesters. Several full-scale engine tests were performed to verify the improvements. The engine tests showed up to 1.8% reduction of the fuel consumption while keeping low oil consumption by using smoothly honed liner surfaces and low ring loads/widths. Further reduction of the oil consumption was shown in the tribotests and simulations when textured liner surfaces were used. To accomplish this, a cost-effective texturing process has to be found and to be confirmed in the engine tests.

  • 21.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Guilbert, Franck
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor. Ecole Nationale Supérieure d'Arts et Métiers, Centre Arts et Métiers ParisTech, Aix en Provence, France.
    Lundmark, Jonas
    Applied Nano Surfaces Sweden AB, Uppsala, Sweden.
    Mohlin, Johan
    Gnutti Carlo Sweden AB, Gothenburg, Sweden.
    Rosén, B.-G.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Optimization of the Triboconditioning Process on External Cylindrical Surfaces2015Ingår i: Proceedings of the 15th International Conference on Metrology and Properties of Engineering Surfaces, Raleigh, NC: American Society for Precision Engineering (ASPE) , 2015Konferensbidrag (Refereegranskat)
    Abstract [en]

    The use of tungsten disulfide in tribofilms on functional surfaces has been a proven way to reduce the frictional losses in rolling and sliding contacts, especially in lubricated contacts at boundary and mixed regime. A suitable and cost-effective process to deposit tungsten disulfide is by ANS Triboconditioning, the mechano-chemical surface finishing process for improving the tribological properties of mechanical components made of steel or cast iron. However, it is not known what are the optimal process parameters, speeds and pressures, to achieve an optimal surface treatment. In this paper, the modifications of the work-piece surfaces under Triboconditioning have been tracked to optimize the process parameters. To closely control the conditions, a commercial tribometer with a block-on-ring configuration was used. Cylindrical tungsten carbide samples (representing the tool) were rubbed against steel rings (representing the work-piece) under two different loads and speeds. The ring surfaces of two different finishes (ground and honed) were measured on the same place before and after treatment to track the surface modifications. At last, the treated rings were rubbed against a flat steel surface in start-stop sequences that resemble pin-roller operating conditions of a truck valve train and the friction behavior was screened. The results show a reduction of the core roughness of the ring surfaces with the lowest friction for the ground rings treated by low load and low speed.

  • 22.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Kofod, Guggi
    InMold Biosystems, Farum & Høje-Taastrup, Denmark.
    Rebeggiani, Sabina
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Evaluation of Durability of SOG-layers on Steel Surfaces by Wear and Scratch Tests2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Steel moulds with high precision surfaces are being used in various branches. Process aspects, like tool life and tribological properties, as well as design issues are of great importance. This work summarises experimental studies performed to test durability properties of SOG (spin-on-glass)-layers on steel surfaces. This coating technique is based on a newly developed method for surface preparation of tools which has been demonstrated to be durable for more than 66.000 replications in injection moulding processes without loss of surface fidelity. The procedure allows surface roughness reduction from approximately 200 nm Ra down to some few nm for high gloss applications, as well as easy transfer of large-area functional nanostructures on complex 3D surfaces.

    Three different types of surfaces were investigated: SOG-layered metal surfaces with three different layer thicknesses, one ingot casted and one electro slag remelted material (with hardness level of 950 and 2500 MPa, respectively). The metal surfaces were ground and polished to mirrorlike finishes.

    Three circular samples of each type were rubbed against a hard steel ball of 6.35 mm radius on a commercial pin-on-disk tribometer. To resemble the molding process a sliding speed of 2 mm/s and a load of 8 N were chosen. The tests were performed with 5 minutes intervals until the first damage on the surface were observed. In parallel, scratch tests were performed in the same tribometer. The surfaces were measured in-situ by a portable microscope and a stylus, and afterwards by a white light interferometer and scanning electron microscope to evaluate the size of the wear/scratch traces.

    The surface type with the longest time to damage and/or smallest wear/scratch traces was considered to be the most durable one.

  • 23.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lööf, Pär-Johan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Dumbreville, Lucas
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap. École nationale d'ingénieurs de Saint-Étienne (ENISE), Saint-Étienne, France.
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Nilsson, Per
    Volvo Group Trucks Technology, Gothenburg, Sweden.
    Functional Parameters Screening for Predicting Wear between Two Cylindrical Surfaces with Different Finishes2017Ingår i: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, s. 75-76Konferensbidrag (Refereegranskat)
  • 24.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lööf, Pär-Johan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Nilsson, Per
    Volvo Group Trucks Technology, Gothenburg, Sweden.
    Functional parameter screening for predicting durability of rolling sliding contacts with different surface finishes2018Ingår i: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 6, nr 2, artikel-id 024005Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The reliability and lifetime of machine elements such as gears and rolling bearings depend on their wear and fatigue resistance. In order to screen the wear and surface damage, three finishing processes: (i) brushing, (ii) manganese phosphating and (iii) shot peening were applied on three disc pairs and long-term tested on a twin-disc tribometer. In this paper, the elastic contact of the disc surfaces (measured after only few revolutions) was simulated and a number of functional and roughness parameters were correlated. The functional parameters consisted of subsurface stresses at different depths and a new parameter called 'pressure spikes' factor'. The new parameter is derived from the pressure distribution and takes into account the proximity and magnitude of the pressure spikes. Strong correlations were found among the pressure spikes' factor and surface peak/height parameters. The orthogonal shear stresses and Von Mises stresses at the shallowest depths under the surface have shown the highest correlations but no good correlations were found when the statistics of the whole stress fields was analyzed. The use of the new parameter offers a fast way to screen the durability of the contacting surfaces operating at similar conditions. © 2018 IOP Publishing Ltd.

  • 25.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Ohlsson, Robert
    Volvo Group Trucks Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Effect of the Measurement Size on the Robustness of the Assessment of the Features Specific for Cylinder Liner Surfaces2013Ingår i: Metrology and Properties of Engineering Surfaces, 2013: Proceedings of the 14th International Conference on Metrology and Properties of Engineering Surfaces, 2013, s. 377-381Konferensbidrag (Refereegranskat)
    Abstract [en]

    The quality of the cylinder liner surface is of great importance due to the impact on the fuel/oil consumption and emissions of the internal combustion engines. A good liner function depends on the size and distribution of the deep honing grooves and amount of the cold work material (Blechmantel) left inside the grooves after finishing. A fast evaluation of these features requires optical 3D measurements with a larger area and good resolution, but the commercial interferometers used today are with limited resolution when measuring larger areas. To find out how the measurement size and resolution would affect the quantification and number of measurements needed for a robust assessment, two objectives, 2.5x and 10x, were used for measuring a cylinder liner from a truck engine. The Blechmantel was of a special interest as it first comes into a contact with piston/rings, detaches in particles and wears the running surfaces. The 2.5x objective showed more robust assessment than the 10x one manifested with lower number of measurements needed for the parameters describing the features: Blechmantel, groove width and height, groove balance and number of grooves.

  • 26.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Ohlsson, Robert
    Volvo Power Train Corp Sweden.
    Rosén, Stefan
    Toponova AB, Sweden.
    Rosén, B.-G.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Characterisation of transparent deposits on cylinder liner surfaces of HDD truck engines2009Konferensbidrag (Refereegranskat)
  • 27.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Tomanik, Eduardo
    MAHLE Metal Leve, Jundiai, Sao Paulo, Brazil; University of Sao Paulo, Sao Paulo, Brazil.
    Grange, Simon
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap. École nationale d'ingénieurs de Saint-Étienne (ENISE), Saint-Étienne, France.
    Epinat, Flavien
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap. École nationale d'ingénieurs de Saint-Étienne (ENISE), Saint-Étienne, France.
    Novel Testing Methods for Screening the Tribological Performance of Ring-Liner Surfaces2017Ingår i: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, s. 59-60Konferensbidrag (Refereegranskat)
  • 28.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Tomanik, Eduardo
    University of Sao Paulo, Sao Paulo, Brazil.
    Grange, Simon
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap. ENISE, St. Étienne, France.
    Epinat, Flavien
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap. ENISE, St. Étienne, France.
    Novel testing methods for screening the tribological performance of ring-liner surfaces2018Ingår i: Surface Topography: Metrology and Properties, E-ISSN 2051-672X, Vol. 6, nr 3, artikel-id 034017Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The piston system accounts for about the half of the frictional losses of internal combustion engines and requires special testing methods to understand and improve its function. The most common way to screen the surface performance is to rub ring/liner segments against each other in a reciprocating manner. However, short reciprocating tests have intrinsic low sliding speeds, unable to reach the mixed/hydrodynamic regimes found in the engine, especially at the mid-stroke. This paper presents a rotating test for the oil control ring, which has the largest frictional losses of all other rings. Both reciprocating and rotating tests were conducted using different in-house developed modules and fixtures. Twin land oil control rings against liners with two different finishes commonly used in heavy duty diesel truck engines were tested under similar loads and speeds as in a real engine. Engine oil 5W-30 and room temperature was used for all the tests. Sliding speed, load, friction force and electrical resistance were recorded during the tests. The results show a clear discrimination of the different liner finishes depending on the lubrication regime present.

  • 29.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Tomanik, Eduardo
    MAHLE Metal Leve, Jundiai, Sao Paulo, Brazil.
    Profito, Francisco
    University of Sao Paulo, Sao Paulo, Brazil.
    Influence of measurement and filtering type on friction predictions between cylinder liner and oil control ring2016Ingår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 100, s. 7-17Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It is of a vital importance to reduce the frictional losses in the engines and hence the fuel/energy consumption. The major contributors to this are the oil control ring and cylinder liner interactions difficult to understand when comparing the experimental and theoretical results. The latter largely depend on the liner surface measurement and filtering type used in the simulations. Therefore, low-pass and high-pass filtrations were applied and the friction behaviors between the filtered liner surfaces and a perfectly flat ring surface were simulated for different engine speeds. The surfaces low-pass filtered by lower cutoffs showed higher friction, while the type of de-noising revealed about two and a half times higher friction. Stylus surfaces showed larger friction than the interference ones. © 2015 Elsevier Ltd. All rights reserved.

  • 30.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Tomanik, Eduardo
    Mahle Metal Leve, Jundiai - Sao Paulo, Brazil.
    Profito, Francisco
    University of Sao Paulo, Sao Paulo – SP, Brazil.
    Influence of Surface Waviness on Predictions of Friction between Cylinder Liner and Oil Control Ring2015Ingår i: Proceedings of the 42nd Leeds – Lyon Symposium on Tribology, September 7-9, 2015, Lyon, France, 2015Konferensbidrag (Refereegranskat)
    Abstract [en]

    It is of a vital importance for automotive industry to reduce the frictional losses in internal combustion engines and hence their fuel consumption and CO2 emissions. The major contributors to this are the oil control ring (OCR) and cylinder liner interactions. These interactions are of complex multi-physics and multi-scale nature and many attempts have been made to improve the modelling and understanding of the phenomena involved. Even though continuous improvements have been made (see for ex. [1-3]), the form, waviness and roughness variation of real engineering surfaces still cause a large scatter in the results. The most of the models include measured liner surfaces, which are then filtered to capture the micro-effects of the roughness scale. However, by doing this, the contact conditions change (asperity contact distributes more evenly, see Fig. 1) such that the part of the boundary friction reduces and the part of the hydrodynamic friction increases accordingly for a given engine speed. This study focuses on one of these multi-scale problems, namely on how the 3D measurement type/size and filtering affects the predictions of friction between cylinder liner and OCR of truck engines. Two types of 3D liner surface measurements were investigated: (i) interference (with an objective of 2.5x, size of 2.5x3.3mm) and (ii) 4x8mm stylus measurement. The form was removed by fitting and subtracting a 2nd order polynomial and the waviness was filtered out by using a robust Gaussian filter with three different cutoffs: 2.5mm, 0.8mm and 0.25mm. The friction behaviours (i.e. the Friction Mean Effective Pressure-FMEP) between the primary/ filtered liner surfaces and a perfectly flat ring surface were then simulated for different engine speeds. The relative errors of the OCR’s FMEPs with respect to the primary surface were evaluated and results discussed.

  • 31.
    Dimkovski, Zlate
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Yoann, Charon
    Perrier, Maxime
    Cabanettes, Frédéric
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    A Sensitivity Study of the Tribotesting Setup to Rate Different Liner Surfaces2012Ingår i: 15th Nordic Symposium on Tribology: NordTrib 2012, Trondheim, 2012Konferensbidrag (Refereegranskat)
  • 32.
    Elghoul, zoelfikar
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    John, Shobin
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Surface Topographical  Analysis Of Cutting Inserts2016Självständigt arbete på avancerad nivå (magisterexamen), 40 poäng / 60 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The following report conducted with collaboration of the University of Halmstad and ABSandvik Coromant.The focus of the project is characterizing the surface topography of different surface treatmentvariants before and after chemical vapor deposition (CVD).As a part of improving the knowledge about the surface area characterization and accomplisha better knowledge and understanding about surfaces and its relation to wear of uncoatedWC/Co cutting tools The project initiated in February 2016 and end date was set to May2016.The methodology used in this thesis based on the statistical analysis of surface topographicalmeasurements obtained from interferometer and SEM by using Digital-Surf-MountainsMapsoftware.The finding from this thesis showed that Mean and Standard deviation method, Spearman’scorrelation analysis and Standard deviation error bar followed by ANOVA and T-test areeffective and useful when comparing between different variants.The thesis resulted in a measurement approach for characterizing different surfacetopographies using interferometer and SEM together with statistical analysis.Keywords: 3D-Surfaces Texture, CVD coating inserts, Interferometer, Spearman’s correlation andANOVA & T-test.

  • 33.
    El-Ghoul, Zoel-Fikar
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    John, Shobin
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lööf, Pär-Johan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lundmark, Jonas
    Applied Nano Surfaces AB, Uppsala, Sweden.
    Mohlin, Johan
    Gnutti Carlo Sweden AB, Gothenburg, Sweden.
    Wear Analysis of Pin and Roller Surfaces2017Ingår i: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, s. 190-192Konferensbidrag (Refereegranskat)
  • 34.
    Johansson, Staffan G.
    et al.
    Volvo Technology, Gothenburg, Sweden.
    Nilsson, Per H.
    Volvo Technology, Gothenburg, Sweden.
    Ohlsson, Robert
    Volvo Powertrain, Gothenburg, Sweden.
    Anderberg, Cecilia
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Optimization of the cylinder liner surface for reduction of oil consumption2005Ingår i: Proceedings of the World Tribology Congress III, 2005, s. 559-560Konferensbidrag (Refereegranskat)
    Abstract [en]

    A decrease of oil consumption in the modern truck engine would mean decrease of particulate matter and hydrocarbon emissions. This decrease has a positive impact on the environment. One important source of oil consumption is the piston/piston-ring/liner system. One way of decreasing oil consumption is to optimize the surface topography of the liner. In this study different liner surfaces and different piston rings were investigated. The investigation shows that it is possible to decrease both the oil film thickness and the friction without sacrificing wear properties of the piston-liner system. A new surface parameter for quick wear estimation of this system is presented. Copyright © 2005 by ASME.

  • 35.
    Johansson, Staffan
    et al.
    Volvo Technology AB, Gothenburg, Sweden.
    Nilsson, Per H
    Volvo Technology AB, Gothenburg, Sweden.
    Ohlsson, Robert
    Volvo Technology AB, Gothenburg, Sweden.
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Simulation and experimental analysis of the contact between oil control ring and cylinder liner in a heavy duty diesel engine2013Ingår i: Tribologie und Schmierungstechnik, ISSN 0724-3472, Vol. 60, nr 3, s. 23-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In heavy-duty diesel engines the piston system is the largest source of frictional losses, accounting for about 50 % of the total frictional losses. Due to the high tangential force of the oil control piston ring this component is responsible for a considerable amount of the total friction losses. The primary aim of this study was to determine the correlation between different cylinder liner surface morphology and friction; the secondary aim was to validate the simulation model using reciprocating tribometer experiments. A novel deterministic simulation approach was used to analyse the frictional interaction between oil control ring and cylinder. Multi variate analysis was used to analyse the effect of different cylinder liner surfaces on frictional outcome. Simulated results were compared to tribometer experiments. The simulation results show that a smaller honing angle decreases both hydrodynamic and boundary friction and that average level of plateau amplitude is most beneficial to decrease frictional losses. The simulation result also helps gaining insight into previous engine test result. Future work includes additional verification of the positive simulation result.

  • 36.
    Johansson, Staffan
    et al.
    Volvo Technology AB.
    Nilsson, Per
    Volvo Technology AB.
    Ohlsson, Robert
    Volvo Powertrain AB.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Experimental friction evaluation of cylinder liner/piston ring contact2011Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 271, nr 3-4, s. 625-633Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fuel consumption is an extremely important parameter for the automotive industry today. Anticipated emission legislative demands in combination with a rising oil price are true motivators. In engines the piston system is the largest source of frictional losses, accounting for about 50% of the total frictional losses, thus it is important to optimize. Apart from frictional losses the piston system is a large consumer of lubricating oil, a considerable contributor to the total amount of particulate emissions (PM). New materials, coatings and high-tech machining processes that previously were considered to be too expensive and therefore only used in complex applications are today becoming more affordable. It is important to develop reliable test methods to study these new concepts. The reciprocating tribometer at Volvo Technology has been updated to better evaluate the frictional difference between material combinations/surfaces; it is possible to evaluate a number of operational parameters in each experiment. The components that were studied were a piston ring running against a cylinder liner. Friction, wear and change in surface morphology were studied in the experiments. It is shown that for the introduced DoE based tribometer test the interaction of dynamic viscosity, velocity and contact pressure can be studied within one experiment. The results show differences in friction which could be explained as the surface creating beneficial contact conditions for oil film build-up. It is also apparent that surface roughness is important regardless of material properties. To better understand the correlations between friction and surface roughness a future study should include a study of similar materials with different roughness values.

  • 37.
    Johansson, Staffan
    et al.
    Volvo Technology AB.
    Nilsson, Per
    Volvo Technology AB.
    Ohlsson, Robert
    Volvo Powertrain AB.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Experimental friction evaluation of cylinder liner/piston ring contact: Results2009Ingår i: Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces / [ed] P. Pawlus, L. Blunt, B.-G. Rosen, T. Thomas, M. Wieczorowski, H. Zahouani, Rzeszow: Rzeszow University of Technology , 2009, s. 193-199Konferensbidrag (Refereegranskat)
  • 38.
    John, Shobin
    et al.
    Högskolan i Halmstad.
    Cabanettes, Frederic
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). University of Lyon – ENISE, Saint-Etienne, France.
    Etievant, Lucas
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap. University of Lyon – ENISE, Saint-Etienne, France.
    Lööf, Pär-Johan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Running in of superfinishing surfaces in lubricated rolling sliding contacts2017Ingår i: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, s. 62-64Konferensbidrag (Refereegranskat)
  • 39.
    John, Shobin
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    El-Ghoul, Zoel
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lööf, Pär-Johan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lundmark, Jonas
    Applied Nano Surfaces AB, Uppsala, Sweden.
    Mohlin, Johan
    Gnutti Carlo Sweden AB, Gothenburg, Sweden.
    Friction between pin and roller of a truck's valvetrain2019Ingår i: Surface Topography: Metrology and Properties, E-ISSN 2051-672X, Vol. 7, nr 1, artikel-id 014001Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In order to minimize the fuel consumption in internal combustion engines, the frictional losses must be minimized between the moving parts such as the sliding bearings. In this study, the sliding friction between the pin and roller in a heavy duty truck engine's valvetrain has been investigated. Three combinations of production components with different surface treatment were used: steel pin with steel roller, steel pin with WS2 coating inside the roller and PVD coated steel pin with steel roller. In-house test rig was used, enabling controlled conditions close to the real engine. A new method for alignment using a laser scanner was introduced together with high resolution tactile measurements of radial displacement during test. Surface topography of pins and rollers was measured before test with a mechanical stylus instrument. The WS2 showed 3.1 times and the PVD showed 2.5 times lower friction than the steel type at low speeds. Even though the friction reduction of WS2 over the PVD is not large, the important advantage is that the WS2 can be manufactured at lower costs than the PVD one. Good correlations among the friction, initial roughness and radial displacements were also found.

  • 40.
    John, Shobin
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    El-Ghoul, Zoel-Fikar
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lööf, Pär-Johan
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lundmark, Jonas
    Applied Nano Surfaces AB, Uppsala, Sweden.
    Mohlin, Johan
    Gnutti Carlo Sweden AB, Gothenburg, Sweden.
    Friction between Pin and Roller of a Truck’s Valvetrain2017Ingår i: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, s. 193-194Konferensbidrag (Refereegranskat)
  • 41.
    KUMAR, BHARGAV
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    MAZZA, FEDERICO
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Enhancing Filament Quality and Investigations on Print Quality of Thermoplastic Elastomer (TPE) products manufactured by Fused Deposition Modeling (FDM)”: Developing a robust methodology by optimizing the respective process variables2018Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Additive manufacturing is gaining popularity at a rapid rate and has been a resourceful production process to reduce material usage, wastage (scrap) and manufacturing costs for various applications. The project conducted, emphasizes on Thermoplastic Elastomer (TPE SE6300C-65A) material, which is a highly versatile compound, and has the ability to exhibit properties of both rubber (Elastomers) in terms of flexibility and plastic (Polymers) in terms of recyclability. Cost reduction without compromising quality is one of the important factors for industries. The project involves the use of TPE pellets to extrude filaments that could be used for 3D Printing. Filament extrusion involves process variables like Nozzle Temperature, De-humidification of pellets, Diameter of the nozzle, Distance of collection, Cooling and Angle of inclination of the extruder. These process variables are optimized to accomplish the desired quality of filament. The filament produced through extrusion is further used to make products using Fused Deposition Modeling (FDM). FDM also involves numerous process variables like Layer Thickness, Build Orientation, Print Infill, Print Speed etc. In this study, different test specimens, in terms of geometrical shapes are printed from the material, TPE SE6300C-65A and tested in order to understand how the surface features as well as the dimensional accuracy change with different process variables.

    It is observed that the surface topography produced throughout FDM process is majorly affected by the angle of orientation of the printed part. The main goal of this thesis is to give the reader a better understanding on which process variable, such as layer thickness, temperature and print speed affect the surface roughness of the models and also a comparison between these three variables, highlighting which is more or less affecting. It is also observed the dimensional accuracy of the real specimen deviate from the value input into the CAD software. The results obtained in this study clearly suggest that there is a lot of opportunities for future improvements especially regarding the dimensional accuracy, it is imperative to achieve the highest precision possible in order to have commercial values for the FDM 3D printing.

  • 42.
    Löfgren, Hans
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    A first order friction model for lubricated sheet metal forming2018Ingår i: Theoretical and Applied Mechanics Letters, ISSN 2095-0349, Vol. 8, nr 1, s. 57-61Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents the derivation of a first order friction model for lubricated sheet metal forming. Assuming purely plastic real contacts, Newton's law of viscosity, and a square root behavior of the hydrodynamic coefficient of friction with respect to the hydrodynamic Hersey parameter an analytic model is found. The model predicts the coefficient of friction as a function of the relative pressure, the relative Hersey parameter and the real contact coefficient of friction. Questions about local and global friction are raised in the validation of the model against flat tool sheet experiments. For some flat tool sheet experiments reasonable agreements are obtained assuming a rigid punch pressure distribution. The restricted number of user inputs makes the model useful in early tool design simulations. © 2018 The Authors. Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics

  • 43.
    Löfgren, Hans Bertil
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    A solution to the hydrodynamic lubrication of a circular point contact sliding over a flat surface with cavitation2012Ingår i: Theoretical and Applied Mechanics Letters, ISSN 2095-0349, Vol. 2, nr 3, artikel-id 032004Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This letter presents an analytical solution to the hydrodynamic lubrication of a circular point contact sliding over a flat surface with cavitation. The solution is found by solving the Reynolds equation with Reynolds boundary condition for cavitation. The cavitation boundary is shown to be straight lines directed 108.4° against the sliding direction. The result is experimentally verified in the limit of large values of viscosity, sliding velocity and radius of a spherical ball. The solution raises questions about the coupling between cavitation and film rupture and can be used as an independent check on the validity of numerical solutions.

  • 44.
    Lööf, Pär-Johan
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Dambreville, Lucas
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). École Nationale d’Ingénieurs de Saint-Étienne, Saint-Étienne, France.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Nilsson, Per H.
    Volvo Group Trucks Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Evaluation of Surface Changes under Twin Disc Tests2016Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    In order to choose the right manufacturing process in terms of costs and component performance, three differently manufactured surfaces were investigated: brushed, multiple shot-peened and phosphated surfaces. In-house twin disc tribometer was used to test the wear and fatigue performance of the different surfaces. The evoution of the surface topography has been evaluated by in-line stylus and microscope image measurements as well as interference measurements of replicas taken at various test intervals. The form changes has been assessed by stylus measurements. The results have shown that the surface roughness played the major role to wear and fatigue performance.

  • 45.
    Lööf, Pär-Johan
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Cabanettes, Frederic
    ENISE, Saint-Étienne, France.
    Nilsson, Per H.
    Volvo Group Trucks Technology, ATR, Göteborg, Sweden.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Virtual Evaluation of Gear Manufacture – To Use 3D Surface Data to Predict Performance2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    The manufacturing and finishing of gears include several processes such as grinding, hobbing, shaving, honing, shot peening and phosphating. For the automotive industry it is a constant challenge to improve the durability and reduce the fuel consumption in a cost effective way by using robust processes for mass manufacturing. A better knowledge of the properties of the manufactured surfaces in gears, and especially how they interact in different combinations is an important knowledge when designing gearboxes for the future. The following paper proposes an efficient way for choosing the better manufacturing and predicting the behavior of new combinations of process parameters in the early stage of the design process based on simulations of 3D surface measurements. The simulation model uses two rough surfaces of counterpart gear teeth contacting and deforming elastically under a typically critical load during operation. Outputs from the simulations are the pressure distribution and real contact area later used for ranking the differently manufactured surfaces. Four different types of surfaces were taken from manufacturing; samples were extracted and measured on a coherence scanning interferometer. Two surface types were ground differently and two were shot-peened with different process parameters. The results show the shot-peened surfaces, especially the double shot-peened type B1, performed better than the ground ones manifested in larger real contact areas and lower/fewer pressure spikes. Based on the correlations of the 3D roughness parameters with the simulation outputs, some roughness parameters are suggested for more robust quality control.

  • 46.
    Nilsson, Bertil
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Hansbo, Peter
    Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, Sweden.
    A goal oriented adaptive finite element method for hydrodynamic lubricationManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    We present a goal-oriented adaptive finite element method for a cavitation model based on Reynolds' equation. A posteriori error estimates and adaptive algorithms are derived, and numerical examples illustrating the theory are supplied.

  • 47.
    Nilsson, Bertil
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Hansbo, Peter
    Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, Sweden.
    Adaptive finite element solution of a cavitation problem in hydrodynamic lubricationManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    We present an adaptive finite element method for a cavitation model based on Reynolds' equation. A posteriori error estimates and adaptive algorithms are derived, and numerical examples illustrating the theory are supplied.

  • 48.
    Ohlsson, Robert
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Westberg, John
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    The interrelationship of 3D surface characterisation techniques with standardised 2D techniques2003Ingår i: Advanced techniques for assessment surface topography: development of a basis for 3D surface texture standards "SURFSTAND" / [ed] Liam Blunt, Xiangqian Jiang, London: Kogan Page Science , 2003, s. 197-220Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    The objectives and main aim of the work discussed in this chapter is to compare 2D with 3D surface roughness parameters measured on functional surfaces. The functional surfaces provided were automotive cylinder liners, steel sheet product and ball bearings. Tests designed to throw light on the dispersion and variability, when measuring and calculating 2D and 3D parameters, were also carried out. These results indicated the number of measurement needed for a surface to receive a stable mean value for the topography. Additionally, work is discussed which shows the functional relationship between traditional 2D surface parameters and a range of the newly developed 3D parameters. This study allowed a deeper understanding of the functionality of automotive cylinder bores, and empirical wear relationships are proposed. Finally, studies were carried out on sheet steel for the purpose of comparing optical and tactile measurement techniques

  • 49.
    Pawlus, Paweł
    et al.
    Rzeszóv University of Technology.
    Blunt, LiamHuddersfield University.Rosén, Bengt-GöranHögskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.Thomas, TomHögskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.Wieczorowski, MichalPoznan University of Technology.
    Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces2009Proceedings (redaktörskap) (Refereegranskat)
  • 50.
    Rebeggiani, Sabina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Dimkovski, Zlate
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Kofod, Guggi
    InMold Biosystems, Taastrup, Denmark.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Empirical Evaluation of Spin-on-Glass-Layers on Steel Surfaces by Wear Tests2014Ingår i: Tribologia Finnish Journal of Tribology, ISSN 0780-2285, Vol. 32, nr 1, s. 19-24Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Dies and moulds with high precision surfaces are being used in various branches, e.g. in the plastic industry where the surface finish are conventionally performed by manual polishers. With ever increasing demands of shorter lead times and reduced costs, efforts have been made to automate this finishing process. This paper presents an empirical study performed to test durability properties of SOG (spin-on-glass)-layers on steel surfaces. The results showed that the thin coating last longer than the thicker ones, and that the harder coatings withstood wear significantly better than the steel reference samples thus motivating further investigations.

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