Abstract Effects of working speed (v) of die and lubricant on frictional characteristics of C5191 copper alloy during cold forming process are studied. The friction on contact surface is mainly caused by slight ploughing in small deformation and tearing after adhesion in large deformation, which translates at a critical deformation (deformation threshold (DT)). DT increases with increasing v. Lubricants have little effect on DT at 0.15 and 15 mm/s, but have a significant effect at 1.5 mm/s. Lubricating effect of oil and Molykote is equivalent at low v, especially before the DT, but has notable difference at high v. However, the ploughing action and tearing area by adhesive friction at high speed are smaller than those at low speed.

中文翻译：

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成形条件对铜合金冷体成形过程摩擦特性的影响

摘要 研究了冷成形过程中模具工作速度(v)和润滑剂对C5191铜合金摩擦特性的影响。接触面的摩擦主要是小变形时的轻微犁沟和大变形时的粘附后撕裂引起的，在临界变形（变形阈值（DT））处转化。DT 随 v 的增加而增加。润滑剂在 0.15 和 15 mm/s 时对 DT 影响不大，但在 1.5 mm/s 时有显着影响。油和Molykote的润滑效果在低v时相当，特别是在DT之前，但在高v时有显着差异。但高速下的犁地作用和粘附摩擦的撕裂面积小于低速时的。