基于Deform的筒形件冷挤压数值模拟分析

Numerical Simulation Analysis of Cold Extrusion of Tube Workpieces Based on Deform

长径比大且壁厚较薄的筒形件,采用常规锻造一次成形无法满足其变形程度大的要求。基于此,本文提出了二次成形的锻造工艺,首先对坯料热锻获得预制坯,而后对预制坯料进行冷挤压,仅小部分变形。本文模拟了筒形件锻件的冷挤压变形规律,并优化了其工艺参数。结果表明,凸模与凹模间距最小处以及坯料与凹模初始接触部位容易产生应力集中,入模角11°~13°为最佳工艺参数。

The one step forming of conventional forging of tube workpieces with large aspect ratio and thin wall thickness can not meet the requirements of large deformation degree. Based on this, the forging technology of two-step forming was put forward. Firstly, the preform was obtained by hot forging, then cold extrusion was carried out, and it had a small part of deformation. The deformation law of cold extrusion of cylindrical forging was simulated and its technological parameters were optimized. The minimum distance between the punch and the die and the initial contact position between the blank and the die are easy to produce stress concentration. The entry angle of 11°-13° is the best process parameter.