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冷挤压压模寿命低是妨碍广泛采用这种先进挤压方法的原因之一。将阴模镶上硬质合金,可将这种压模的寿命提高39～59倍。硬质合金阴模应当以较大的公盈压入模框内,这样可以在硬质合金中产生予压应力,以抵消挤压时所产生的危险拉应力。硬质合金阴模的配合部分应设计成圆形,以便能以较大的公盈装入模框内。公盈量的选择应使硬质合金在压装后所产生的压应力大于挤压时作用在阴模材料上的拉力(或者最低限度也应相等)。实际上,阴模与模框的第一层之间的公盈为阴模外径的0.55～0.7%。为了提高模框的强度,必须将模框设计成两层的或三层的。第
Cold extrusion die low life is one of the reasons that hinder the widespread use of this advanced extrusion method. The negative metal inlaid carbide, can increase the life of this die 39 to 59 times. Carbide female mold should be larger public indentation into the mold, which can be generated in the carbide pre-stress, to offset the danger of tensile stress generated. Carbide die with the mating part should be designed into a circular, so that a larger public surplus into the mold box. The amount of equity should be chosen so that the compressive stress on the cemented carbide after press-fitting is greater than the tensile force acting on the matrix material during pressing (or at least, it should be equal). In fact, the male die between the male mold and the first layer of the mold is 0.55 to 0.7% of the female mold outer diameter. In order to improve the strength of the formwork, the formwork must be designed in two or three layers. No.