航空薄壁零件数控铣削加工仿真与误差控制

NC Milling Simulation and Error Control of Aerial Thin Wall Workpieces

薄壁零件机械加工变形和误差是难以解决的课题。以高精密薄壁零件天线底板的数控加工为研究对象,进行建模、仿真、分析、加工试验与测试,研究了航空薄壁件数控加工误差控制方法。以主动预防和控制加工误差的思想为指导,将几何仿真与物理仿真融为一体,综合采用切削参数局部调整、刀具路径修正改进等改进方法,减小加工变形,改进工艺质量。改变传统加工中依赖经验、定性和保守的工艺方案,有效减少物理加工实验次数。采用优化工艺方案,大大减少工艺质量成本,缩短制造周期。

The deformation and errors of thin wall workpieces machining are difficult to control and minish. NC machining of a high precision thin wall antenna soleplate was modeled, simulated, analyzed and tested to investigate machining error control methods of aerial thin wall workpreces in NC milling. An active precaution and control approach of machining errors was adopted. Geometric simulation was integrated with physical simulation to predict antenna soleplate machining deformation and error. Local modification of cutting parameters, cutter path correction and so on were synthetically applied to minish machining errors and improve machining quality. The approach modifies the traditional empirical process scheme that is qualitative and conservative, and effectively reduce machining emperiments. An optimal process scheme was achieved to reduce machining costs and shorten manufacturing cycle.