弱刚度零件热力耦合建模及其加工变形分析  

Analysis of Machining Deformation of Low-rigidity Parts based on Coupled Thermal-mechanical Model

作　　者：庞璐[1] 左建华[1] 卢继平[1] 王菲菲[1] 张纯喜[1] 

机构地区：[1]北京理工大学,北京100081

出　　处：《新技术新工艺》2015年第1期43-46,共4页New Technology & New Process

摘　　要：弱刚度零件刚度小,加工时在切削力和切削热等多种因素的影响下易发生变形,变形形式复杂多样,不易控制,这类问题成为近年来研究的热点。以简单的框类弱刚度零件为代表,确定其材料本构关系,建立零件的热力耦合模型,并利用有限元分析软件模拟其加工过程,得出零件加工过程中的温度场和应力场的分布并预测其变形。通过对比大切深和分层铣削2种加工方式得出在一定范围内减小切削深度ap可有效控制弱刚度零件变形的结论。Because of its poor rigidity, Low-rigidity parts are more likely to appearing deformation in machining due to cutting force, cutting heat and other factors. And it is difficulty to control, which attracts much attention in recent years. In the paper, the constitutive relation and coupled thermal-mechanical model of a simple frame low-rigidity part were made to simulate the machining process by using the finite element method, and drew the distribution of temperature field and stress field and predict its deformation. By comparing the large depth of cut and layered milling processing methods, a conclusion was made that reducing the cutting depth can effectively control deformation of the low-rigidity parts within a certain range.

关 键 词：弱刚度件 有限元 热力耦合 加工变形 

分 类 号：TG506.4[金属学及工艺—金属切削加工及机床]