螺纹综合测量机的扫描原理与误差分析

Analysis of Scanning Principle and Measurement Uncertainty of Thread Comprehensive Measuring Machine

检测圆柱螺纹的主要方法有螺纹综合测量机的轮廓扫描法和测长机的三针法、量球法,这些检测方法的测量结果存在一些差异。通过论述螺纹综合测量机检测圆柱螺纹的结构原理,构建轮廓扫描几何模型,设计针尖半径补偿算法,并对检测方法的误差影响因素进行了分析。经研究,所提出的螺纹综合测量机的轮廓扫描法具有测量精度高、速度快、参数全面、检测过程自动化、受人为因素干扰小的特点,是螺纹综合参数测量的优选方法。

At present,there are two major methods to measure the cylindrical threads.One is the contact method by thread measuring machine,and the other is the three-wire method(and two-ball method)by length measuring machine.However,the measurement results by the two methods are different in some ways,which leads to controversy.This paper presents the structural principles of cylindrical screw thread measurement by thread measuring machine,constructs the geometric model of profile scanning,designs the algorithm of tip radius compensation,and analyzes the error factors of the testing method.The profile scanning method of thread comprehensive measuring machine proposed in this paper has the characteristics of high measurement accuracy,high speed,comprehensive parameters,automatic detection process and little human interference.It is the best method of thread comprehensive parameter measurement.