1、 I 二维硬态切削过程的有限元仿真二维硬态切削过程的有限元仿真 摘摘 要要 本文提供了一个用聚晶立方氮化硼刀具（PCBN）切削淬硬钢的有限 元分析模型。该模型基于自适应网格技术和大变形技术，从而解决了在切 屑变形过程中由于网格变形过大出现的网格畸变问题。在模拟切屑形成的 过程中，使用了纯粹的变形技术来弥补了基于切屑分离准则的传统有限元 模型的不足。这种方法不仅消除了切屑分离准则和预先定义分离线的需 要，同时获得了一个更加真实和合理的切屑成形过程。本文用商业有限元 软件 ABAQUS/Explicit 模拟不同刀具几何参数对切削力的影响，建立了直 角切削时平面应变条件下刀具切削过程的仿真模型，并
2、对不同切削几何参 数（倒棱角度、切削速度）的有限元模型进行了计算分析和比较，并通过 进行正交高速切削实验与仿真结果进行对比，得出了较为合理的硬态切削 过程的刀具几何参数，这对实际切削过程的刀具优化设计和降低成本有着 重要的指导意义。 关键词关键词 切削仿真；ABAQUS/Explicit 软件；自适应网格技术；二维直角 切削 II 2D Cutting Process of Processing and FEM Abstract This paper presents a FEM simulation model for the analysis of cutting hardened ste
3、els using Polycrystalline Cubic Boron Nitride(PCBN) tool. The model is built on an adaptive meshing approach and deformation technique which solves the excessive mesh distortion problem due to large deformation existing in the chip formation process of cutting. In modeling the chip formation, a pure
4、 deformation technique is employed to address the deficiency of the conventional FEM model built based on chip separation criterion. This method not only eliminates the need of the use of the chip sepration criterion and a pre- defined separating line, but also achieves a more realistic and reasonab
5、le chip formatin process. In this paper the different tool geometrical parameters effect upon cutting forces is simulated using commercial FEM code ABAQUS/Explicit. It establishes the emulation of tool cutting process in 2-D orthogonal cutting and plane strain condition, calculates the analytical mo
6、dels and compares the results, achieves a considerable reasonable geometrical parameters and morphological features of chip formation during hardened steel cutting process, which agrees well with the previous experiments. This has a instructional significance in the optimization of tool edge design and helps cutting the cost. Keywords Cutting simulation; ABAQUS/Explicit; Adaptive meshing technique; 2-D orthogonal cutting III 目目 录录 摘 要 . I Abstract II 第 1 章 绪论 1 1.1 课题背景 . 1 1.1.1 课题来源 1 1.1
