端铣加工工件变形仿真预测方法研究

A Study on Prediction Approach of the Workpiece's Face Milling Deformation

研究端铣加工变形的仿真预测方法.将理论计算与有限元方法相结合,提出采用加工过程离散与载荷等效的方法将瞬态铣削力和瞬态铣削热作为动态载荷施加于工件的有限元模型上,应用间接热结构耦合场分析方法,模拟复杂工件的三维铣削加工过程.预测了工件在铣削力和铣削热作用下的变形情况.通过实例仿真及分析结果与实际加工情况的对比,验证了所提出的仿真预测方法的可行性与有效性.

Studies the prediction approach of workpiece in face milling deformation. Combining the analytical method and finite element method, a finite element model for 3D milling process is set up considering the primary factors to the workpiece＇s deformation. An effective algorithm of equivalent load and discrete process is proposed to put the transient cutting force and cutting heat on the finite element model. And through the indirect thermo-mechanical coupled finite element method, the milling process is simulated. The behavior of deformation of the complex workpiece under the effects of cutting force and cutting heat is thus predicted. By comparison of the analysis with that of simulation, the feasibility and validity of the proposed prediction approach were verified.