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随着科学技术的发展,越来越多的粉末冶金用于各种产品,但也促进机械加工采用新工艺方法。我们厂生产的某种产品上的零件,材料为钨基密度重合金,在加工M3—6H内螺纹中,经常断丝锥,废品率很高。后来,我们经过观察发现,加工其他材料时,加工完螺纹底孔φ2.5_0~(+0.08)mm后,基本上没有什么变化。而加工这种材料时,由于丝锥的挤切,使螺纹底孔变小,紧
With the development of science and technology, more and more powder metallurgy is used in various products, but also promote the use of new technology and methods of machining. Parts of our factory produce a kind of product, the material is heavy density tungsten alloy, in the processing of M3-6H internal thread, often broken tap, rejection rate is very high. Later, we observed that when processing other materials, after processing the bottom hole φ2.5_0 ~ (+0.08) mm, basically no change. The processing of this material, due to the tap squeeze, so that the bottom of the screw hole smaller, tight