面向硬切削的加工过程建模与仿真研究

摘要

In order to research the influence of workpiece hardness on hard cutting processes, the constitu-tive relation , suitable for the hard cutting processes, was transformed into the one that adapts to the ABAQUS interface, and then, the geometry model of two-dimensional orthogonal free cutting and the John-son-Cook material cumulative damage model were also utilized to establish coupled thermal-mechanical finite element models for cutting AISI H13 steel under a wide range of hardness values. Simulations were success-fully achieved in ABAQUS. According to the simulation results, the main cutting forces get a approximately linear increase, the radial forces almost keep constant,and the highest temperature of the tool and chip in-creases,with the increase of AISI H13 steel hardness under a certain condition. It is also found that the PCBN tool can still meet the requirements of cutting when the hardness of AISI H13 is 62HRC,according to the a-nalysis of the temperature distribution of the cutting system and the changes of the highest temperature on the tool and chipwith the changes ofworkpiece hardness.%为了研究工件硬度对硬切削过程的影响,将适用于硬切削加工过程的材料本构关系进行改造,以适应ABAQUS接口,并结合二维正交自由切削几何模型和Johnson-Cook材料累积损伤模型建立了切削不同硬度AISI H13的热力耦合有限元模型,在ABAQUS中实现了仿真。仿真表明,在其他条件不变的情况下,随工件硬度的增加,主切削力近似呈线性关系增加,背向力几乎保持不变,刀具和切屑的最高温度不断增加。通过分析切削系统温度分布和刀屑最高温度随硬度的变化规律发现,当AISI H13的硬度为62HRC时,PCBN刀具仍能满足切削要求。