基体类型对硬质合金刀片铣削模具钢耐磨性能的影响
2020-10-19
作者：张沁春，雷学林，高阳华，何云
单位：华东理工大学机械与动力工程学院
摘要：选用三种相同涂层、不同基体（M25，M30，M35）的硬质合金铣刀片，在相同切削参数下，进行SKD61模具钢的干切削磨损试验，并借助影像仪和SEM扫描电镜对刀片的磨损形貌及基体金相进行观测，研究不同基体对刀片耐磨性能的影响。试验结果表明，在相同切削条件下，三种基体的耐磨性优劣依次是M25>M30>M35。通过显微金相及磨损分析发现，基体WC相晶粒越细小，耐磨性能越好，同时TaC的加入对基体晶粒的细化和耐磨性有很大的影响。刀片的主要磨损形式为后刀面磨损，主要磨损特征为涂层剥落，而高温作用下的粘结和热氧化磨损是刀片失效的根本原因。
关键词：SKD61模具钢；硬质合金刀片；基体晶粒大小；耐磨性能
中图分类号：TG135.5；TH117.1文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.06.001
Effect of Matrix Types on Wear Resistance of Cemented Carbide
Blade Milling Die Steel
Zhang Qinchun，Lei Xuelin，Gao Yanghua，He Yun
Abstract:Three cemented carbide milling blades with the same coating and different substrates(M25，M30 and M35) are selected，and the process of a dry cutting wear experiment on SKD61 mold steel is under the same cutting parameters.At the same time，the wear morphology and matrix metallographic of the blade are observed by means of the imaging instrument and SEM scanning electron microscope，studying the effects of different substrates on the wear resistance of blades.The test results show that，under the same conditions，the abrasion resistance of three kinds of substrates is M25>M30>M35 (in turn).Through microscopic metallographic and wear analysis，it is found that the smaller the matrix WC phase grain is，the better the wear resistance.The addition of TaC has a great influence on the refinement and wear resistance of matrix grains.The wear form of the blade is mainly the wear of the rear knife surface，wear characteristics are peeling mostly.Besides，oxidation under the action of high temperature is the root cause of its wear.
Keywords:SKD61 mold steel；cemented carbide blade；matrix grain size；wear resistance