电子柱气电测微仪在测量薄壁管材中的应用

主要研究了分辨率均为1μm的电子柱气电测微仪和数显千分尺测量工具对Φ8.45 mm×0.2 mm(公差±0.02 mm)薄壁管材外径测量结果的影响。通过环规验证薄壁管材外径尺寸测量的准确性,实验结果表明,数显千分尺测量薄壁管材外径尺寸的测量值偏小,因此采用电柱气电测微仪作为薄壁管材外径尺寸的测量工具更为合理。

三坐标测量机动态误差的建模方法

为了提高三坐标测量机的测量速度，缩短测量周期，分析了影响给定的三坐标测量机动态误差的因素。对三坐标测量机的具体结构作了分析，用电感测微仪进行了动态偏转角误差的测量，并推导出由动态偏转误差得到测头处的动态位移误差的方法。同时，对由导轨的直线度造成的误差进行了讨论。指出动态误差主要是由各构件绕气浮导轨连接处的偏转和各运动构件本身的弯曲变形造成的。从理论上可以证明，在气浮导轨力矩刚度和横梁弯曲刚度已知的情况下，只要测量出两侧气浮导轨滑架的偏转角误差。

ANALYSIS AND MEASUREMENT FOR THE DYNAMIC ERRORS OF COORDINATE MEASURING MACHINES

The analysis and calculating method of dynamic errors of CMMs during probing are discussed.To relate the dynamic displacement errors with the dynamic rotational errors a method for obtaining the displacement errors at the probing position from dynamic rotational errors is presented.It is pointed out that the finite element method might be used for modeling dynamic errors.However,dynamic errors are difficult to be modeled so a combined practical and theoretical approach is needed.In addition,the dynamic errors are measured with inductive position sensors.