金属切削变形本构方程的研究

State-of-the-art of Constitutive Equations in Metal Cutting Operations

金属切削过程的本构关系与应变、应变率、温度等多种因素有关,建立切削变形区内工件材料的本构方程是研究切削变形的关键。本文在文献综述的基础上,首先给出金属切削本构方程的试验研究方法,然后给出金属切削工件材料的典型本构方程,并给出Usui本构方程中不同工件材料的特性系数,以及同一工件材料AISI52100(HRC62)的不同本构方程。经对比分析可见,金属切削过程中变形区内的应力—应变关系除与试验方法、切削条件有关外,还与工件材料的组分和微观晶格结构密切相关。本文最后分析了金属切削变形本构方程研究中存在的问题,并指出发展趋势。

To understand the effect of workpiece material properties upon chip deformation, it is necessary to investigate the material properties at high strain, high strain rate and high temperature. A thorough literature review indicates that the material properties for metal cutting have been obtained mainly using four methods： high-speed compression tests, Hopkinson＇s bar tests, practical machining tests and reverse engineering using the FEM technique. The constitutive relationships are presented. Flow stress parameters for several workpiece materials in Usui＇ s constitutive equation are given. Several constitutive equations for the same workpiece material AISI 52100（HRC 62） are also presented. The flow stress data obtained from literature review are. influenced many factors, such as measurement methods, cutting conditions, material components, and crystal microstructures. The barriers and future in the fields of research on constitutive equations in metal cutting operations are analyzed.