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本文概述了挤压件的主要类型,提出所有冷挤件在冷挤压中都存在需要退料这一共同问题。在现通行的两大类退料方法中,大都较简单,只有当挤压件下段为管形时所用的环形顶件器(外顶式顶件器)较复杂,这种顶料方法有模具闭合高度大、模具零件多和结构复杂等缺点,同时,不适用于薄壁件的顶料。为了解决这些问题,本文介绍一种新的顶料方法(或称内顶式顶料法),它没有外顶式顶件器的缺点:结构简单、模具闭合高度小、模具零件少,能顶薄壁件。在采用这种新顶料方式时,要进行一些核算,本文介绍了核算办法和应用实例。在航空工业中应用冷挤压技术时的三大难题(即材料硬、形状复杂和批量小)中,解决挤压形状复杂的零件的问题,在很大程度上与模具结构的发展有关,本文介绍的新型顶件器,就是属于这类发展。
This article outlines the main types of extrusion and suggests the common problem that all cold extrusions need to be withdrawn during cold extrusion. In the current two major types of material withdrawal methods, most of the more simple, only when the lower part of the extrusion tube used when the ring top (top-top device) is more complex, this method of top mold material Closed height, mold parts and more complex and other shortcomings, at the same time, does not apply to the thin-walled parts of the top expected. In order to solve these problems, this paper introduces a new method of toping (or top-inpping method), which does not have the disadvantages of the top-top device: simple structure, small mold closing height, few mold parts, Thin-walled pieces. In the use of this new way to the top of the jacking, to carry out some accounting, this article describes the accounting methods and application examples. In the aviation industry in the application of cold extrusion technology, the three major problems (that is, hard materials, complex shapes and small batch size) to solve the problem of extrusion of complex parts, to a large extent with the development of mold structure, The introduction of the new top device, is the fall of this type of development.