高速切削数值模拟技术浅析

Research on Numerical Simulation of High-speed Machining

依据大变形理论和虚功原理对高速切削过程进行分析,建立了基于拉格朗日描述的有限元控制方程并采用二维有限元模型进行模拟。有限元模型综合考虑了热力耦合,材料本构关系,接触规律,分离准则及切削过程中动态因素的影响。数值模拟重点考察了非稳态的切屑形成过程及切削过程中的应力、温度、切削力的分布情况,并对模拟结果进行分析和验证,指出所建立的有限元模型是合理的。

Large deformation theory and virtual work principle were applied to analyses high - speed machining process, the finite element governing equation was approached based on Lagrangian description. A two - dimensional finite element model was developed, which takes into account dynamic effects, thermal - mechanical coupling, constitutive law and contact with friction. The simulations mainly concern the study of the unsteady - state process of chip formation. An attempt has been made in the present investigation to predict analytical the distribution of Misses stress, temperature and cutting forces for the orthogonal cutting process. In the end, a high - speed machining case was/dmulated and the finite elemem model was proved to be reasonable by analyzing and validating some results of simulation.