为了防止活塞的开裂,将配置于燃烧室喉口部的铜合金镶嵌物的固定部分与活塞主体进行整体浇铸,利用这种牢固的装配结构,防止由于活塞顶部产生的高温、高应力引起镶嵌物松弛的现象。图示为该活塞实例。 活塞主体1的材料为铝硅合金,在活塞顶2上开有燃烧室3、喉口部4,并形成一凹状轮廓。喉口部4是由含0.5％铍和2.5％钴的铜合金环状镶嵌物5构成的,镶嵌物 In order to prevent cracking of the piston, the fixed portion of the copper alloy insert arranged at the throat of the combustion chamber is integrally cast with the piston main body. With this strong fitting structure, the high temperature and high stress caused by the piston crown are prevented from causing the inlay Relaxation phenomenon. Illustrated as this piston example. The main body of the piston 1 is made of aluminum-silicon alloy, and the combustion chamber 3 and the throat portion 4 are opened on the piston top 2 and form a concave contour. The throat portion 4 is made of a copper alloy ring inlay 5 containing 0.5% beryllium and 2.5% cobalt, and the inlay