虚拟加工中薄壁基本元变形算法及其实验校验的研究

Research on Algorithm of Deformation of Workpiece Thin-walled Element in Virtual Machining Process and Experimental Verification

提出了“局部基本元素解析估算+关键点有限元分析”的技术途径。首先从通用性虚拟铣削过程变形量快速分析技术的需求出发,研究了薄壁基本元素的典型类别和相应的变形算法,在此基础上构建了基本元素及变形算法库。为减小快速分析带来的误差,提出对关键点变形量进行有限元和实验校核以获得校正系数的方法。预测变形与实验对比表明提出的技术途径高效可行。

It is infeasible to analyze the deformation of thin - walled workpiece in whole cutting process depend on FEM totally, because of its low efficiency. In this paper, a new method is proposed to realize rapid simulation and analysis of workpiece deformation in virtual machining process. The new method computes the deformation of thin - walled component rapidly with analytical algorithms and analyzes the deformation at key position accurately with FEM. For this requirement, typical thin - wall elements in peripheral milling and the analytical deformation algorithms for them are studied. Then a library of elements and algorithms is established. The deformation at key position is calibrated to compensate the inaccuracy of the rapid analytical algorithms. The experimental results show the new method is efficient and feasible.