非调质塑料模具钢的机械加工性能

The Machinability of Unquenched and Untempered Die Steel for Plastic Moulding

研究了非调质塑料模具钢的机械加工性能，通过切削加工性能对比实验证实，该塑料模具钢的可切削加工性能优于经调质处理的４５号钢及Ｐ２０塑料模具钢，并通过磨削、抛光性能实验证明该钢具有良好的磨、抛性能，经一般的磨削和抛光加工其粗糙度分别达到Ｒａ＜０．０３μｍ和Ｒａ＜０．００６μｍ，分析了Ｓ系，Ｓ－ＲＥ系以及Ｓ－Ｃａ－ＲＥ系钢的易切削相，探讨了易切削机理。

The machirnability of unquenched and untempered die steel for plastic mouming is stud-ied.Compared with the commercially available quenched and tempered 0. 45 wt% carbonsteel and die steel P20 for plastic mouding, the steels developed are found to be superior inmachinability including chip breakability,cutting force,tool life,etc,It is also found thatthe steels are of good grindability and stability.After grinding and polishing,the surfaceroughness Ra<0.03 μm and<0.006 μm respectively are achieved.The free-cutting phasesin the S steel,S-RE steel and S-Ca-RE steel are analyzed and the free-cutting mechanism discussed.