对圆柱形工件在弹性工具中镦粗和闭合模镦粗时的回弹和二次屈服进行了分析。
The spring back and secondary yielding of cylindrical billets in elastic tools during upsetting and closed-die upsetting are analyzed.
如果缺少系统的局部镦粗规则的指导，则会造成大量的试模时间和材料的浪费。
In the absence of systematic upsetting instructions, we would waste quite a few materials as well as a great deal of time for model experimenting.
提出了一种浮动凹模芯模闭式镦粗法，以解决厚壁管在单向加压的普通液压机上进行闭式镦粗后壁厚不均的问题。
Using closed die upsetting process to manufacture thick wall tubes on normal hydraulic press may cause the dis uniformity of the thickness along the length of the tube.
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