关键词: 三维螺纹综合测量机, 接触式测头, 结构优化, 正交试验, 标定

Abstract: In order to reduce the influences of the contact probes on the accuracy of the high-precision three-dimensional thread measuring machines， an optimization plan for the structure and size of the contact probes was designed， and the corresponding calibration method was proposed. The structural parameters of the probes were optimized through finite element simulation and orthogonal experiments to determine the optimal structural parameters. The calibration model of the probes was established by the coordinate transformation theory and the principle of least square method and the calibration experiments were carried out. The optimized probes were tested through the screw plug gauge comparison experiments and the screw ring gauge and plug gauge comparison experiments under different preloads. The results show that the standard deviation of the parameters of the contact probe measuring thread plug gauge and ring gauge is about 1 μm， which meets the measurement accuracy requirements of the contact probes of the three-dimensional thread comprehensive measuring machines. The optimization scheme and calibration method provide important theoretical basis for the design of the probe structures. 

Key words: three-dimensional thread comprehensive measuring machine, contact probe, structure optimization, orthogonal test, calibration