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活塞销是汽车发动机精密另件之一。外圆精度要求一级,不圆度不能大于0.0025毫米,而表面光洁度要求(?)(?)(?)(?)_(10)以上。为了达到这些技术要求,活塞销在表面淬火后,外圆须经几次无心磨削和光整加工。如第一汽车厂的活塞销在淬火后经过六次无心磨削和二次无心抛光。而根据一些国外资料介绍,有些活塞销是超过六次磨削的。该厂活塞销的热处理原来是渗炭淬火,然后经六次无心磨削。现在采用了高频淬
Piston pin is one of the precision parts of automobile engine. Cylindrical requirements of a precision, non-circularity can not be greater than 0.0025 mm, while the surface finish requirements (?) (?) (?) (?) _ (10) above. In order to meet these technical requirements, after the piston pin surface quenching, the outer cylinder to go through several centreless grinding and finishing. Such as the first automobile factory piston pin after quenching after six unmotivated grinding and the second centerless polishing. According to some foreign information, some of the piston pin is more than six grinding. The factory piston pin heat treatment turned out to be carburizing quenching, and then after six heartless grinding. Now using high-frequency quenching