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汽车、拖拉机后桥中的从动螺旋齿轮和从动伞齿轮的热处理,国内外基本上都是采用低合金钢渗碳、压床淬火的方法。我厂生产这两种齿轮,一直也是采用18CrMnTi 钢渗碳、坑冷、重新保护加热、脉动压床淬火的工艺。18CrMnTi 等本质细晶粒钢,在920℃左右进行渗碳直接淬火,晶粒度不致粗大,压床淬火的目的完全是为了防止变形。可是在实际生产中,齿轮涨大、失圆、挠曲等,有时仍较严重。另一方面,有时齿轮平放着在柴油中淬火,也并未
Automobile, tractor rear axle driven helical gear and driven bevel gear heat treatment, at home and abroad are basically low carbon steel carburizing, press hardening method. I plant the production of these two kinds of gear, has been using 18CrMnTi steel carburizing, cold pit, re-heating, pulsating press quenching process. 18CrMnTi and other essential fine grain steel, carburizing direct quenching at about 920 ℃, the grain size is not coarse, the purpose of press hardening is completely to prevent deformation. However, in the actual production, the gear goes up, missing a circle, flexing, etc., and sometimes still more serious. On the other hand, sometimes the gear is quenched flat in diesel fuel and it is not