An Error Area Determination Approach in Machining of Aero-engine Blade

航空发动机叶片数控加工区域误差识别方法

As a result of the recently increasing demands on high-performance aero-engine,the machining accuracy of blade profile is becoming more stringent. However,in the current profile,precision milling,grinding or near-netshape technology has to undergo a tedious iterative error compensation. Thus,if the profile error area and boundary can be determined automatically and quickly,it will help to improve the efficiency of subsequent re-machining correction process. To this end,an error boundary intersection approach is presented aiming at the error area determination of complex profile,including the phaseⅠof cross sectional non-rigid registration based on the minimum error area and the phaseⅡof boundary identification based on triangular meshes intersection. Some practical cases are given to demonstrate the effectiveness and superiority of the proposed approach.

随着对航空发动机性能要求的不断提高,叶片型面加工精度要求愈加严格。然而,目前常用的型面精加工方式中,精密铣削、磨削或近净成形工艺在工艺定形前都需要经过烦琐的迭代误差补偿。而在该过程中若能快速确定误差区域和边界将有助于提高后续迭代过程的效率。为此,本文提出了一种针对叶片复杂型面误差区域自动识别的最小面积误差区域边界求交方法,包括基于最小误差区域的截面非刚性配准和基于三角网格求交的边界识别。应用实例说明了该方法的有效性和优越性。