Abstract
The purpose of this paper is to clarify the mechanism and lubricating effects of the outflow behavior of lubricant trapped in pits. The pits regularly arranged on a workpiece surface were produced by coining a die surface topograghy. The effects of pit size, array and area ratio of pits on the friction behavior were investigated by using a roiling type tribometer. Lubricant flows out from oil pits in the direction of the friction stress. The outflow trace becomes deeper for the lubricant of higher viscosity or for the annealed workpiece. With increasing the area ratio of pits or decreasing the pit size or arranging the pits to cross array, the outflow lubricant from pits covers wider surface area and the lubricating effects of the pits become larger. The lubricating effects of the pit also become larger with decreasing viscosity of the lubricant or roughness of the surface around the pit and with increasing the hardness of the workpiece.
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