随形固定自适应夹具加工变形控制方法

叶片的加工精度及其稳定性对航空发动机的性能有直接的影响,由于叶片的薄壁和曲率多变特点,易受装夹、切削力和残余应力的影响而产生弯曲、扭转变形。针对该问题,本文提出了一种随形固定自适应夹具加工变形控制方法,可以将叶片无应力装夹,并将加工过程中产生的变形逐层消除。实验结果表明,采用随性固定自适应夹具加工变形控制方法,可以有效控制叶片加工过程中产生的变形,提高加工精度。

Control Method of Machining Distortion Using Adaptive Fixture with Shape

The machining precision and stability of blade have direct influence on the performance of aircraft engine.Blade is easily affected by clamping,cutting force and residual stress which result in warp and torsion due to thin-walled and free surface of blade.A methodology for the control of machining distortion that eliminates surface errors by using an adaptive fixture with the shape is presented.The fixture can achieve unstressed fixing and stress releasing.Machining distortion can be eliminated without multiple repairing datum and changing machine.The experimental results shows that the adaptive fixture can eliminate effectively surface errors in machining,and the precision of test blade machined this way is improve obviously.