轮廓度约束下近净成形叶片余量优化方法

针对近净成形的叶片在自适应精加工中余量不均这一问题,提出了考虑叶型截面线轮廓度公差约束的余量优化方法。在设计基准与加工基准配准的条件下,改变工件做刚性位移的余量优化思路,建立一种新的叶身优化模型,避免优化后叶片检测处的截面线超出轮廓度公差,提升叶片余量优化阶段寻找到目标加工曲面的能力。最后以某压气机叶片为例进行验证,此方法不仅能够保证叶身加工余量,还能同时满足型面检测处的轮廓度公差,为近净成形的叶片在自适应加工中提供一种新的余量优化方法。

Anallowance optimization method for near-net shape blade under profile tolerance constraints

To solve the problem of non-uniform machining allowance of the near-net shape blade in adaptive finish machining,an allowance optimization method is put forward considering the profile tolerance constraints of the blade cross curve.When the design datum is matched with the machining datum,the allowance optimization theory that the workpiece makes rigid displacement is modified to establish a new optimization model for the blade.The method proposed prevents the inspection section curve of the blade after optimization from going beyond the profile tolerance,and improves the ability of identifying the surface to be machined in the allowance optimization stage.A compressor blade is taken as an example to validate the method.Analysis shows that the method can meet the requirements of blade machining allowance and can also satisfy the profile tolerance of the inspection section curve,providing a new approach of allowance optimization for near-net shape blade in the adaptive machining process.