机油泵传动链轮粉末冶金制造及感应热处理的工艺探讨

Investigation on the PM technology and induction heat treatment processes of the dirve sprocket for oil pump

粉末冶金是一种高效低耗、节约材料的绿色制造技术。但粉末冶金零件因存在孔隙,密度不均匀,强度硬度相对较低,限制了其使用范围。本文主要研究了机油泵传动机构中链轮的粉末冶金成形、烧结工艺流程,以及该链轮感应淬火工艺中的感应器设计和感应淬火处理工艺的关键参数。结果表明,制备的链轮压坯密度高于6.7 g/cm^(3),经过1 100~1 120℃渗铜烧结后硬度达到76HRB,60 kW功率感应淬火热处理后齿部形成一层均匀的硬化层,硬度达到71HRA,满足产品性能要求,有效延长了链轮的使用寿命。

Powder metallurgy is a kind of green manufacturing technology with high efficiency,low consumption and material saving.However,the powder metallurgy parts have pores,uneven density,low strength and hardness,which limit its applications.This paper mainly studies the powder metallurgy forming and sintering process flow of the sprocket of the oil pump transmission mechanism,as well as the inductor design and the key parameters of the induction quenching process of the sprocket.The results show that the density of the sprocket compaction is higher than 6.7 g/cm^(3),and the hardness of the sprocket compaction reaches 76 HRB after copper penetration and sintering at 1 100-1 120 ℃.The hardness of the sprocket compaction reaches 71 HRA after induction quenching with 60 kW power,which meets the performance requirements of the product.The service life of sprocket is extended effectively.