关于提高活塞销冷挤压凸模寿命的研究

Study on increasing working life of piston pin's cold extruding punch

在简要分析了活塞销冷挤压必要性的基础上，对活塞销冷挤压技术在国内的发展历史及其现状进行了讨论。明确指出妨碍活塞销冷挤压技术在国内推广应用的关键因素是其冷挤压凸模的寿命太短。深入分析了活塞销冷挤压时金属的流动规律，作用在凸模上的力和凸模失效的原因。提出了提高活塞销冷挤压凸模寿命的方法。

On the basis of simply analysing necessity of piston pin's cold extrusion, historical development and present situation of piston pin's cold extruding technique in China is discussed. It is pointed that application and dissemination's key factor of piston pin's cold extruding technique in China is that working life of piston pin's cold extruding punch is too low. Metal flow and force acting on the punch and reason of the punch losing efficacy in the course of piston pin's cold extrusion are thoroughly analysed.Method increasing working life of piston pin's cold extruding punch is put forward.