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在冷挤压中,经常会遇到这样一个问题,即某一吨位压力机所能加工毛坯的最大截面是多少,冷挤压方式一般分为反挤压、正挤压和复合挤压(见图1)。由于复合挤压的单位挤压力是由单向正挤压或单向反挤压所决定的,因此对复合挤压而言,在不同吨位挤压设备上所允许的模具工作部分最大尺寸,也与单向正挤压或单向反挤压时相同,所以这里只讨论反挤压和正挤压两种情形。一、反挤压的计算方法冷挤压时计算所需设备吨位由下式求得: P=C·p·F_凸式中:P——所需设备吨位[kg]; p——单位挤压力[kgf/mm~2];
In the cold extrusion, often encountered such a question, that is, a tonnage presses can be processed rough is the largest cross-section, cold extrusion methods are generally divided into reverse extrusion, extrusion and composite extrusion (see figure 1). As the compound extrusion unit squeeze pressure by the one-way forward extrusion or one-way reverse extrusion decision, so the composite extrusion, extrusion equipment in different tonnage allowed the maximum working part of the mold size, Also with one-way forward extrusion or one-way reverse extrusion the same, so here only discuss the anti-extrusion and extrusion are two cases. First, the calculation method of anti-extrusion Cold extrusion equipment required tonnage calculated by the following formula: P = C · p · F_ convex in: P - tonnage required equipment [kg]; p - unit Extrusion pressure [kgf / mm ~ 2];