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细长螺钉(图1)是采用正挤压和一次镦头两道工序加工而成的。正挤压的变形量高达83.6%。本文重点介绍黑色金属变形量这么大的冷挤压经验。一、变形程度的校核如果采用一次正挤压变形工艺(冷挤压件图见图2)。由直径9.85毫米挤成直径3.45毫米的断面缩减率为ε_F=88%。这样大的变形程度如果在条件较为有利的情况是可能达到的。但是考虑到由直径9.85毫米到
Slim screw (Figure 1) is a positive extrusion and a heading two processes processed. The deformation of the extrusion is as high as 83.6%. This article focuses on such a large amount of black metal deformation of cold extrusion experience. First, the degree of deformation of the check If you are using a positive extrusion process (cold extrusion pieces see Figure 2). The reduction ratio of the section extruded from a diameter of 9.85 mm to a diameter of 3.45 mm is ε_F = 88%. Such a large degree of deformation if the conditions are more favorable circumstances may be achieved. But considering the diameter from 9.85 mm to