基于坐标检测的蜗杆齿形精密测量分析

Precise Inspection of Worm Tooth Profile Based on Coordinate Measurements

分析了几种常见蜗杆类型与测量有关的参数计算方法,阐述了测量蜗杆齿形时干涉误差产生的原因和计算方法。分析计算结果表明:对渐开线蜗杆,其测量干涉误差值为0;对法向直廓蜗杆和阿基米德蜗杆,其测量干涉误差值随蜗杆螺旋线升角的增大而急剧增加,愈接近蜗杆齿根,干涉误差值愈大。因而提出用坐标测量系统测量精密蜗杆齿形时,应根据实际蜗杆螺旋面参数及探头参数计算不同测量点的干涉误差值,并消除其对测量结果的影响。

Parameters relating to inspection of some familiar worm gear forms are analyzed, and the interventional error calculation algorithms are expatiated. The computing results show that： for involute helicoidal worms, the inspecting interventional error is zero; for straight-sided in normal section worms and straight-sided in axial section worms （Archimedes） , the interventional error increases rapidly when the helical uplifted angle increases; and the interventional errors are different from different radial positions, the nearer to the root of the tooth, the bigger of interventional errors. So, it is necessary to deduct the interventional errors when computing the tooth profile inspecting data.