航空机匣工件车削加工变形量预测及误差补偿

Deformation prediction and error compensation for turning of aero-engine casing parts

基于车削过程切削力预测模型,采用有限元方法对航空难加工材料薄壁圆筒工件(机匣)的车削变形(让刀)量进行预测,获得了加工变形量与背吃刀量的关系图;进而采用曲线拟合方法,得到了背吃刀量修正函数,利用该修正函数进行刀位点轨迹补偿,可实现提高加工精度、缩短试制周期和降低试制成本的目的。该方法还可应用于其他薄壁圆筒工件的加工变形量预测与误差补偿。

Based on the prediction model of cutting force in turning process, this dissertation uses finite element method to forecast aero-engine difficult machining material thin wall cylinder （casing） turning deformation （cutter）, and gets the relationship graph between the deformation and the cutting depth; then it utilizes the curve fitting method to derive the depth correction function, which is employed for tracking the tool locus after compensation to improve the machining accuracy, shorten the development cycle and reduce the production cost. The research method of this dissertation mentioned above can also be applied to deformation prediction and error compensation of other parts of thin-wall cylinder.