塑性加工における被加工材料表面微細凹部の潤滑効果に及ぼす滑り条件の影響

概要

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A series of experiments have been conducted using a rolling-type tribometer to investigate the mechanism and lubricating effects of the outflow behavior of lubricant trapped in a pit. Experiments using aluminum and mild steel sheets with regularly arranged pits showed that lubricant flows out along the friction stress direction and moves larger distance with increasing sliding ratio. The outflow trace becomes deeper with increasing the forming velocity or oil viscosity. Based on these facts, it was concluded that lubricant trapped in a pit flows out by MPHL(Micro Plasto-Hydrodynamic Lubrication mechanism. With an increase of sliding ratio, the friction coefficient of both the pit region and blank region increses when the blank surface is smooth, but decreases when the blank surface is rough. The lubricating improvement effects of pits are largely dependent on the lubricating regime in the blank region and disappear rapidly with the shift of the lubricating regime in the blank region from the boudary lubrication to the hydrodynamic lubrication.
一般社団法人日本機械学会の論文
2000-06-25