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齿轮热处理不仅要获得一定的金相组织、渗层深度和硬度,还要保证几何精度。在生产中,应根据工件的尺寸、形状和材质确定淬火方式。现将我厂齿轮生产中所采用的几种淬火方式及其变形情况介绍如下。1.毛坯的预备热处理。齿轮在渗碳或碳氮共渗前,进行两次正火或调质,以消除应力,可以减少淬火变形。20CrMnTi钢齿轮毛坯锻造后正火,出炉后堆放,其硬度为HB≤160。毛坯锻造及粗加工后各进行一次正火,硬度可提高至HB180～200,有助于提高插齿或滚齿后齿面的光洁度,一般可达▽6。
Gear heat treatment not only to obtain a certain degree of microstructure, infiltration depth and hardness, but also to ensure geometric accuracy. In production, should be based on the size of the workpiece, shape and material to determine the quenching method. Now my factory gears used in the production of several quenching methods and their deformation are described below. 1. Blank pre-heat treatment. Gear carburizing or carbonitriding before, twice normalizing or quenching to eliminate stress, can reduce the quenching deformation. 20CrMnTi steel gear blank forging after normalizing, stacked after the release, the hardness of HB ≤ 160. Blank forging and roughing after each conducted a normalizing, hardness can be increased to HB180 ~ 200, help to improve gear or hobbing tooth surface finish, generally up to ▽ 6.