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一、问题的提出为提高冷挤压凹模的承载能力,通常必须采用预应力组合凹摸。经验表明,三层组合凹模是冷挤压模具的最好结构形式之一,它既能使组合凹模有较好的通用性和强度,又可节约较昂贵的凹模材料,而且凹模外径减小,为凹模的加工工艺提供了有利条件。工具钢的组合凹模一般都由外向内依次冷压法装配,压装后凹模内径及中套内径均会收缩。在生产实践中,此收缩量的确定往往是一项不容忽视的工作,尤其合金工具钢的凹模收缩量比硬质合金凹模的收缩量大得多。
First, the issue raised In order to improve the bearing capacity of cold extrusion die, usually must be pre-stressed combination of concave touch. Experience has shown that the three-layer composite die is one of the best structural forms of cold extrusion die, which not only makes the composite die has good versatility and strength, but also save more expensive die material, and the die The outer diameter is reduced, which provides favorable conditions for the processing of the die. The combination of tool steel die are generally from outside to inside the cold press assembly, after pressing the die diameter and the sleeve diameter will shrink. In production practice, the shrinkage is often determined to be a job that can not be ignored. In particular, the shrinkage of the die of alloy tool steel is much larger than that of the cemented carbide die.