1种高精度大型阶梯轴圆柱轮廓测量模型

One kind of High Accuracy Measurement Model of Large Stepped Shaft Cylinder Profile

为了提高大型阶梯轴回转部件圆柱轮廓的测量精度,提出1种考虑偏心量、工件倾斜及传感器测头偏移的3偏置测量模型。分析了综合偏置误差对阶梯轴截面圆柱轮廓残余误差的影响及偏置误差在不同工件半径下对圆柱轮廓测量结果的影响,实现了阶梯轴圆柱轮廓精度的准确评定。为了验证3偏置圆柱轮廓测量模型的有效性,采用超精密航空发动机测量仪对大直径阶梯轴的圆柱轮廓进行了测量与评定。结果表明:与传统双偏置测量模型相比,3偏置圆柱轮廓测量模型所评定的大半径阶梯轴同轴度的准确性提高了9.39μm;阶梯轴半径越大,测量精度越高。

In order to improve the measuring accuracy of cylinder profile of rotating parts with the large stepped shaft,a measurement model with three offset error sconsidering eccentricity,tilt of workpiece and offset of sensor probe was proposed.The influence of the comprehensive offset error on the residual error of the cylinder profile of the step shaft section and the influence of the offset error on the measurement results of the cylinder profile under different workpiece radius were analyzed,and the evaluation of the accuracy of the stepped shaft cylinder profile was realized.In order to verify the validity of the cylinder profile measurement model with three offset errors,the cylinder profile of large diameter stepped shaft was measured and evaluated by ultra-precision aeroengine measuring instrument.The results show that compared with the traditional model with two offset errors,the accuracy of coaxiality of large diameter stepped shaft evaluated by the cylindrical profile measurement model with three offset errors is improved by 9.39μm.The measurement accuracy is increased with the increase of the radius of the stepped shaft.