1.绪言自汽车往复式发动机问世以来,发动机活塞环的可靠性与耐久性,一直受到人们的关注。活塞环形状虽简单,但其设计和制造工艺必须具有一定的实践经验。它已经成为当今发动机的关键结构零件之一。因为,它的摩擦特性直接影响发动机的动力性与经济性。活塞环在实际使用中,工况甚为苛刻,即活塞环的运动方向、速度及受到的气体压力皆在周期变化中,经常处于高温燃气和润滑不足下,致使活塞环和气缸套间的磨损很复杂。在发动机所有 1. INTRODUCTION Since the advent of car reciprocating engines, the reliability and durability of engine piston rings have drawn the attention of people. Piston ring shape is simple, but its design and manufacturing process must have some practical experience. It has become one of the key structural parts of today’s engines. Because of its friction characteristics directly affect the engine’s power and economy. Piston ring in actual use, the working conditions are very harsh, that the piston ring movement direction, speed and gas pressure are in the cycle of change, often in the high temperature gas and insufficient lubrication, resulting in wear between the piston ring and cylinder liner is very complex. All in the engine