Research of Precision Measurement Method of Coordinate System Shift for Four-axis Noncontact Measuring Machine
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摘要: 温度变化是引起测量误差的一个重要因素，对于带立式转台的四轴测量机来说，温度变化会造成转台轴线相对于测量机零点的位置变化，即将之前的转台坐标系进行了平移，这样就给测量结果带来了误差。为了测量计算转台坐标系发生的偏移，本文对比了旋转转台多角度测棒法和固定转台单角度测棒法两种方法，最终确定了利用非接触测头在固定转台不旋转的情况下通过标准棒测轴线法来获得转台坐标系偏移，进而实现对测量数据的温度补偿，从而提高测量精度。Abstract: The temperature change is an important factor to cause measurement error. For the four-axis noncontact coordinate measuring machine with vertical rotary table, it will make the location of the rotary table axial line to change with respect to the original point of measuring machine. So the coordinate system based on the rotary table will be translated, and this will bring the measurement error. In order to measure the offset of the coordinate system, the method of measuring cylinder for table rotating with multi angle and the method of measuring cylinder for table not rotating with single angle are compared. At last, the optical probe method to measure the axial line of standard cylinder without the rotary table rotating is used. Then the measuring data can be compensated to improve the accuracy of measurement.
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表 1 旋转转台多角度测棒法测量结果
mm 温度/℃ 轴线偏移或直径差 18.9 21.1 轴线坐标X -0.072 7 -0.073 2 -0.000 5 轴线坐标Y 0.702 5 0.702 4 -0.000 1 轴线坐标Z 102.002 1 102.002 1 0.000 0 标准棒直径D 19.120 1 19.151 3 0.031 2 
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表 2 固定转台单角度测棒法
mm 温度/℃ 轴线偏移或直径差 18.9 21.1 轴线坐标X -0.072 7 -0.091 8 -0.019 1 轴线坐标Y 0.702 5 0.700 8 -0.001 7 轴线坐标Z 102.002 1 102.002 1 0.000 0 标准棒直径D 19.120 1 19.122 0.002
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