For the low accuracy and bad consistency of blade edges in aero engines ,a non-contact opti-cal measuring system was established to measure the geometric dimensions and contour shapes of blade edges in a rapid and accurate way .In the system ,a traditional coordinate measuring machine was taken as a platform ,a special sensing device composed of two laser scanning sensors fixed at a certain angle to each other was taken as the front-end sensor and several data post-processing algo-rithms were integrated .In the measuring procedure ,five transversals at the leading and trailing edges were selected and their contour information was measured to determine the geometric dimensions and machining allowance of the measured blade edges .The system could be used as a component of the manufacturing system to link the segments of designing ,manufacturing and measuring of blades to-gether .Finally ,the leading and trailing edges of three sections of a blade after precision forging are measured by the system .The measuring results verify the effectiveness and practicability of the opti-cal measuring system and show that the repeatability of the system meets the requirements for design and measuring of blade edges .In conclusion ,the system could serve as an evaluating means for the machining quality of the leading and trailing edges of blades .%针对航空发动机叶片进排气边的制造精度和一致性较差等问题,搭建了非接触式的叶片进排气边光学测量系统,以实现叶片进排气边的几何尺寸和轮廓形状的快速精确测量.该系统以传统的三坐标测量机框架为平台,采用由两个互成一定角度的新型激光扫描测头构成的专用测头作为前端传感器,并且内置了多种数据后置处理算法.在测量过程中,在每个叶片截面的进排气边处选取5条截线,分别测量这5条截线上的轮廓信息,从而确定叶片进排气边的几何尺寸和加工余量.该系统可以作为叶片加工系统的组成部分,从而将叶片的设计、制造和测量3个环节紧密地联系在一起.最后,应用该系统对某一精锻叶片的3个等高截面上的进排气边进行了多次测量实验,结果验证了所搭建的叶片进排气边光学测量系统的实用性和有效性,而且测量结果的重复性精度能够满足系统的设计要求和叶片进排气边的检测需求.该项研究为叶片进排气边的加工质量提供了一种高效率、高精度和高一致性的评定手段.
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