摘要: |
针对采用三坐标测量机测量曲面轮廓度问题,分析两件航天产品工装在有基准约束、无基准约束条件下的轮廓度测量方法差异。不完全基准约束的曲面轮廓度测量,测量点与被测件理论模型只能在公差带未被约束方向最佳拟合;完全基准约束曲面轮廓度测量,应按照被测曲面的设计基准建立测量坐标系,且不应对测量点与被测件理论模型最佳拟合;无基准约束曲面轮廓度测量,应对测量点与被测件理论模型六自由度无约束最佳拟合;不同的测量坐标系建立方法对无基准约束的曲面轮廓度的实测值无影响。 |
关键词: 三坐标测量机;曲面轮廓度;坐标测量技术 |
基金项目: |
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Measuring Technique of Surface Profile Based on Coordinate Measurement Machines |
Ouyang Tingting, Liu Yanping, Peng Jiangtao, Ning Lixia, Han Jin
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Tianjin Long March Rocket Aerospace Manufacturing Co., Ltd., Tianjin 300462
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Abstract: |
Aiming to solve the problems in measuring surface profile with three dimensional coordinate measuring machine, the paper analyzes the differences between the methods with and without datum constraints in measuring two aerospace product toolings. When the surface profile is measured with incomplete datum constraint, the measured point and the theoretical model can be best fit in the tolerance zone without constraint, while in the condition of complete datum constraint, the best fitting shall not be processed and measuring coordinate system shall be set up according to the designed datum of the measured surface. In the surface profile measuring without datum constraint, 6-DOF best fitting shall be processed, and various measuring methods have no influence on the measured surface. |
Key words: three-dimensional measuring machine;surfaceprofile;coordinate measuring technique |