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由于冷镦滚子型号繁多,而所选用的原材料(棒料)的规格有限,过去我们采用无心磨削法改制棒料规格,这样,不但材料利用率低,而且改制后的棒料表面硬度增高,影响冲模寿命。 我们根据国外经验,试验了磷化处理新工艺。这就是用化学方法在滚子料表面生成一种海绵状磷酸盐薄膜,这种磷化薄膜呈灰色片状结晶,质地疏松,有吸附力,能将肥皂水吸到海绵体内,这就使处在高压下的坯料在模腔内顺利地流动。由于坯料和下模腔之间隔了一层海绵润滑体。二者不能直接接触,降低了金属变形阻力(据上海科技交流
Due to the variety of cold forging rollers and the limited selection of raw materials (bar stock), in the past we used a centerless grinding method to reform the bar stock specifications so that not only the material utilization is low but also the surface hardness of the bar stock after the reforming is increased , Affect die life. According to foreign experience, we tested the new phosphating process. This is the chemical method to generate a sponge-like phosphated film on the surface of the roller material. The phosphatized film has a gray flaky crystal texture and is loose in texture and has an adsorptive force that sucks the soapy water into the sponge, The blank under high pressure smoothly flows in the mold cavity. As a result of the blank and the lower cavity between the sponge lubrication body. The two can not be direct contact, reducing the resistance of metal deformation (according to Shanghai Science and Technology Exchange