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我厂生产的螺旋伞齿轮有6～7种,材质为18CrMnTi 或22CrMnM_0,一般经渗碳淬火处理。淬火处理采用转底式煤气炉加热,老式气动淬火压床淬火。该压床精度差,上下两平面平行度达不到要求。淬火后零件合格率低,存在一些问题。如外圈挠曲、内孔涨大或椭圆、接触压痕偏一头、零件表面氧化或磨蚀、小头齿部硬度不好等。我们利用现有设备,改革了模具结构,注意了工艺操作,基本上解决了上述问题。以东方红75拖拉机大圆锥齿轮(见图1)热处理为例,简介淬火压模(见图2)。
I plant the production of spiral bevel gear 6 to 7, the material is 18CrMnTi or 22CrMnM_0, usually by carburizing and quenching. Quenching treatment using rotary hearth furnace heating, old-fashioned pneumatic hardening quenching press. The precision of the press is poor, the parallelism of the two planes can not reach the requirement. Qualified parts after quenching low, there are some problems. Such as the outer ring flexion, the hole up large or oval, contact indentation partial head, parts of the surface oxidation or abrasion, small tooth hardness is not good. We use the existing equipment, reform the mold structure, pay attention to the process operation, basically solve the above problems. To East Hong 75 tractor bevel gear (see Figure 1) heat treatment as an example, the introduction of quenching stamper (see Figure 2).