1979年我厂对195B挖掘机回转大齿圈进行细致的分析、研究,决定改进主要参数和加工工艺。一、存在问题分析 1、齿廓塑性变形该大齿圈是英制的(DP1〃,Z=154),因无标准刀具,采用单齿分度成形铣齿法。与其啮合的小齿轮(DP1〃,Z=12),外圆小,模数大,受设备条件的限制,采用划线刨齿法,所以造成周节,齿廓误差大。又由于大齿轮和小齿轮硬度差大(HB302-168=134),影响着 In 1979 I 195G excavator rotary gear ring for detailed analysis, research, decided to improve the main parameters and processing technology. First, the existing problems analysis 1, the plastic profile of tooth profile The ring gear is imperial (DP1〃, Z = 154), because there is no standard tool, the use of single-tooth indexing forming milling method. The meshing pinion (DP1〃, Z = 12), the outer circle is small, the module is large, limited by the equipment conditions, the use of scribing tooth planing method, resulting in weeks, tooth profile error. And because of the large gear and pinion hardness difference (HB302-168 = 134), affecting