复杂薄壁零件数控加工变形误差控制补偿技术研究

高性能航空发动机整体叶盘、大小叶片转子、离心叶轮、叶片等零件广泛采用钛合金薄壁结构。加工过程中的切削力、残余应力将产生零件加工变形及加工误差。本文重点讨论了薄壁零件加工过程中的切削力建模和工件加工表层残余应力的分布规律，提出了对叶盘零件加工变形误差的补偿方案。通过建立精确的切削力、残余应力预报模型，对切削加工过程进行力学仿真，优化切削参数、补偿刀位轨迹，进而实现薄壁结构叶盘零件的精密数控加工。

A Scheme for the Compensation of Deformation Error in NC Machining of Thin-walled Complex Parts

Aeroengine blisk and blades widely use thin-walled parts. The cutting force and residual stress have considerable influence on the distortion of thin-walled parts. Achieving the right profile in such parts increasingly depends on the accurate modeling of cutting force and residual stress and the physical simulation of machining process. The cutting force modeling methodes and the residual stress distribution were discussed. A feasible accuracy NC machining scheme composed of optimization methods for cutting strategy, tool path, and the control and compensation of machining deformation was proposed.