Bengtgoran Rosen - Academia.edu (original) (raw)
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Papers by Bengtgoran Rosen
Medical Engineering Physics, 1996
Threedimensional measurements of surface topography were pe$%rrned using a confocal laser scanner... more Threedimensional measurements of surface topography were pe$%rrned using a confocal laser scanner and a contact stylus instrument.
Advanced Techniques for Assessment Surface Topography, 2003
Friction and wear are constant problems encountered in camshaft development. Among a wide amount ... more Friction and wear are constant problems encountered in camshaft development. Among a wide amount of factors, surface topography is an important feature to improve in this complex system. Four parts of different shapes can be differentiated on an injection cam profile. Therefore the machining of such component is quite particular. Considering the complex shape of an injection cam, this paper is divided in two studies: 1. Variations of surface topography around freshly produced cams in order to emphasize the particular profile of cams which leads to a complex machining. 2. Evolution of surfaces during run-in in order to discover the effects of wear process on a group of roughness parameters. The results show a variation of density of peaks along the freshly produced cam surface and highlight also the importance of roller type on the evolution of topography. Further results show that summits of the surface are rounded off during run-in. Concerning the future, results of the study are encouraging to investigate more deeply the tribological behaviour (contact mechanic, oil film thickness) of the surfaces.
ABSTRACT La superfinition par pierrage des chemises de cylindre est un challenge constant pour l’... more ABSTRACT La superfinition par pierrage des chemises de cylindre est un challenge constant pour l’industrie automobile afin de réduire la friction et la consommation d’huile. Il est nécessaire d’acquérir de meilleures connaissances sur les mécanismes de formation des surfaces afin d’optimiser le procédé de pierrage. En effet des variations de l’état de surface existent à cause de l’usure des pierres de rodoirs. L’article propose donc de mesurer par microscopie confocale ces variations d’état de surface. Six blocs moteurs sont évalués grâce à vingt mesures topographiques par chemise. Ainsi six cent mesures de topographies 3D (1mm par 1mm) ont été effectuées. L’analyse de paramètres 3D de rugosité et de paramètres créés sur mesure a mené aux observations suivantes: une usure des outils de pierrage entraîne la génération de surfaces aux plateaux et piques plus rugueux. Dans le futur, des modèles expérimentaux permettraient d’optimiser la fonctionnalité des cylindres produits.
The friction is of critical importance to sheet metal forming operations. It affects the flow of ... more The friction is of critical importance to sheet metal forming operations. It affects the flow of material in the tool and thereby the scrap rate and final quality of products. In the experimental work the frictional response was measured in a bending under tension (BUT) test under mixed lubricated conditions. The study includes stainless steel, but previous research on carbon steels, coated and uncoated, are discussed also. The experimental results could be explained by the theory of pad bearings. The frictional response showed a correlation to the surface topography, e.g. the amplitude parameter (S q ) and texture aspect ratio parameter (S tr ). When predicting the frictional response of surfaces with multi-component distributions, the standard deviation of the distribution above the mean line could be used.
Medical Engineering Physics, 1996
Threedimensional measurements of surface topography were pe$%rrned using a confocal laser scanner... more Threedimensional measurements of surface topography were pe$%rrned using a confocal laser scanner and a contact stylus instrument.
Advanced Techniques for Assessment Surface Topography, 2003
Friction and wear are constant problems encountered in camshaft development. Among a wide amount ... more Friction and wear are constant problems encountered in camshaft development. Among a wide amount of factors, surface topography is an important feature to improve in this complex system. Four parts of different shapes can be differentiated on an injection cam profile. Therefore the machining of such component is quite particular. Considering the complex shape of an injection cam, this paper is divided in two studies: 1. Variations of surface topography around freshly produced cams in order to emphasize the particular profile of cams which leads to a complex machining. 2. Evolution of surfaces during run-in in order to discover the effects of wear process on a group of roughness parameters. The results show a variation of density of peaks along the freshly produced cam surface and highlight also the importance of roller type on the evolution of topography. Further results show that summits of the surface are rounded off during run-in. Concerning the future, results of the study are encouraging to investigate more deeply the tribological behaviour (contact mechanic, oil film thickness) of the surfaces.
ABSTRACT La superfinition par pierrage des chemises de cylindre est un challenge constant pour l’... more ABSTRACT La superfinition par pierrage des chemises de cylindre est un challenge constant pour l’industrie automobile afin de réduire la friction et la consommation d’huile. Il est nécessaire d’acquérir de meilleures connaissances sur les mécanismes de formation des surfaces afin d’optimiser le procédé de pierrage. En effet des variations de l’état de surface existent à cause de l’usure des pierres de rodoirs. L’article propose donc de mesurer par microscopie confocale ces variations d’état de surface. Six blocs moteurs sont évalués grâce à vingt mesures topographiques par chemise. Ainsi six cent mesures de topographies 3D (1mm par 1mm) ont été effectuées. L’analyse de paramètres 3D de rugosité et de paramètres créés sur mesure a mené aux observations suivantes: une usure des outils de pierrage entraîne la génération de surfaces aux plateaux et piques plus rugueux. Dans le futur, des modèles expérimentaux permettraient d’optimiser la fonctionnalité des cylindres produits.
The friction is of critical importance to sheet metal forming operations. It affects the flow of ... more The friction is of critical importance to sheet metal forming operations. It affects the flow of material in the tool and thereby the scrap rate and final quality of products. In the experimental work the frictional response was measured in a bending under tension (BUT) test under mixed lubricated conditions. The study includes stainless steel, but previous research on carbon steels, coated and uncoated, are discussed also. The experimental results could be explained by the theory of pad bearings. The frictional response showed a correlation to the surface topography, e.g. the amplitude parameter (S q ) and texture aspect ratio parameter (S tr ). When predicting the frictional response of surfaces with multi-component distributions, the standard deviation of the distribution above the mean line could be used.