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一、前言 1984年为了解决齿轮热处理后变形的问题,决定将我厂生产的T140-1型推土机终传动齿轮齿形精加工改为在YC7150型链面砂轮磨齿机上进行磨削加工。终传动齿轮如图1所示,模数10mm、齿数12、压力角20°,精度为按机械工业部标准JB179-83“渐开线圆柱齿轮精度”规定的9-8-8FH级,齿形表面光洁度(?)_7,材料为20CrMnTi合金钢,热处理要求渗碳淬硬:渗碳层深度1.6～2.0mm(为了留磨削
I. Foreword In order to solve the problem of deformation after gear heat treatment in 1984, it was decided to change the final gear tooth profile finishing of T140-1 bulldozer manufactured by our factory to grinding on YC7150 chain gear grinding machine. The final drive gear as shown in Figure 1, the modulus 10mm, the number of teeth 12, the pressure angle of 20 °, the accuracy of mechanical industry standards JB179-83 “involute cylindrical gear accuracy” provisions of 9-8-8FH level, tooth Surface finish (?) _ 7, the material is 20CrMnTi alloy steel, heat treatment requires carburizing hardened: carburized layer depth of 1.6 ~ 2.0mm (to stay grinding