为了平顺地传递运动，齿轮齿的接触面必须精加工成特殊齿廓。
To transmit motion smoothly, the contacting surfaces of gear teeth must be carefully shaped to a specific profile.
工艺：铸铁加热板它把预制好的加热管弯曲成所需要求。放入模具中，用铁水浇铸而成，然后进行精加工，从而得到理想的产品。
Technology: cast iron heating it to good precast bent for the heating requirements. Add to die, from using hot metal casting, then finished, to be the ideal product.
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