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为了使齿轮变形减少到最低限度,可采用双分级淬火法,即在Ar_1分级预冷后再放入熔盐中分级淬火,可使变形量达到最低限度,但硬度要比直接熔盐淬火的略低一些。 如某齿轮材料为45钢,要求硬度HRC40～45。因该齿轮淬前已加工至尺寸,仅留有少量研磨余量。如果按水淬会使其内孔胀0.14～0.16mm,高度已要胀大0.04～0.05mm。若采用双分级淬火,即先用820℃加热,在700℃盐浴中分级预冷60s,再淬火120～140℃熔盐中冷却,这样,齿部及端面硬度达到HRC50～54,内孔变形量仅为±0.005mm,高度变形量为-0.01mm,稍加研磨好可达到其要求。
In order to reduce gear deformation to a minimum, the double classification quenching method can be used, that is, after pre-Ar1 classification and then into the molten salt classification quenching, deformation can be achieved to a minimum, but the hardness than the direct quenching of molten salt slightly Lower. If a gear material is 45 steel, require hardness HRC40 ~ 45. Because the gear hardened before processing to size, leaving only a small amount of grinding allowance. If you press the water quench will make its hole swell 0.14 ~ 0.16mm, the height has to swollen 0.04 ~ 0.05mm. If the use of double-grade quenching, that is, first with 820 ℃ heating, pre-cooling in the 700 ℃ salt bath pre-cooling 60s, and then quenched molten salt 120 ~ 140 ℃ cooling, so that the Ministry of teeth and face hardness HRC50 ~ 54, The amount of only ± 0.005mm, height deformation of -0.01mm, a little grinding can meet its requirements.