铜基粉末冶金摩擦材料调速制动摩擦系数试验

Friction coefficient speed-control experiment of Cu-based wet sintered friction material

摘要:

为得到速度和压力边界条件在摩擦元件接合过程中对摩擦特性的影响机制,设计一种变速滑摩的方法,针对径向槽、双圆弧槽和螺旋槽3种沟槽形式,通过不同工况摩滑过程和闭锁过程的摩擦系数试验数据分析,获得了摩擦系数随滑摩速度及压力载荷变化的特性．试验结果表明,变速滑摩试验可以很好地体现摩擦元件制动过程中的流体动力效应、边界摩擦效应和粘附闭锁效应；沟槽形式一定程度上影响摩擦系数随速度的变化趋势,静摩擦系数随载荷的增大而减小最后趋于稳定；在不同载荷条件下,摩擦系数对速度边界的敏感程度存在差异；变速过程静动比分析结果表明,Cu基粉末冶金摩擦材料适合在重载条件下工作,而且双圆弧沟槽摩擦元件的接合平顺性更好．

Abstract:

In order to obtain the friction mechanism of friction element in engagement with the changes of speed and pressure boundary condition, a newer speed control test method for friction characteristic of friction element with different grooves is proposed. The effect of mixed, boundary and adhesion friction can be well embodied in friction and lock-up experimental process of the friction element. The grooves can impact the trends of the friction coefficient curves with the increase of speed. The static friction coefficient declines with the increase of load and tends to be stable in the end. The friction coefficient sensitivity to speed is different. It is verified that Cu-based sintered friction material can work in heavy duty condition and the one with double arc grooves can engage more smoothly by the fiction static and dynamic ratio investigation.