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活塞是内燃机中一个很重要的另件。它承受发动机汽缸内气体的压力,并将压力经过活塞和连杆传给曲轴,驱使机器运转。活塞工作的主要特点:在高温高压下,作长期连续变负荷的往复运动。因此,活塞必须具有高的强度、导热性、轻的质量和高的精度等,使活塞既有良好的工作性能,又有很长的工作寿命。活塞的主要表面进行加工时,其尺寸精度、几何形状精度、相对位置精度和表面光洁度都应满足产品图纸的技术条件要求。
The piston is a very important part of the internal combustion engine. It withstands the pressure of the gas in the engine cylinder, and the pressure is transmitted to the crankshaft through the piston and connecting rod, to drive the machine running. The main features of the piston work: Under high temperature and pressure, for long-term continuous variable load reciprocating motion. Therefore, the piston must have high strength, thermal conductivity, light weight and high precision, so that the piston has both good working performance, but also a long working life. The main surface of the piston for processing, the dimensional accuracy, geometry accuracy, relative position accuracy and surface finish should meet the technical requirements of product drawings.