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为解决热反挤压时坯料定位问题,采用外置定位钳的方式,将直径小于凹模内径的坯料放置在凹模中心,使反挤压过程中凸模的、坯料、凹模的中心在同一轴线上,保证金属均匀受力。运用Deform-3D软件,针对直径小于凹模内径时的坯料反挤压过程进行有限元数值模拟,分析了金属成形过程中的成形效果及应力分布,结果表明:模拟与工艺试验结果基本吻合,在热反挤压过程中,成形效果良好,金属等效应力分布均匀。经工艺试验验证,该定位方式操作简单,工件氧化皮较少,表面精度较高,适用于各类直径小于凹模内径的坯料定位,符合生产要求。
In order to solve the hot and anti-extrusion billet positioning problems, the use of external positioning pliers way, the diameter smaller than the inner diameter of the blank placed in the die center, the anti-extrusion process punch, blank, die in the center of the On the same axis, to ensure uniform metal force. Deform-3D software was used to simulate the anti-extrusion process of billet with the diameter smaller than the inner diameter of the die. The forming effect and stress distribution in the metal forming process were analyzed. The results show that the simulation results are in good agreement with the experimental results. During the hot extrusion process, the forming effect is good and the metal equivalent stress distribution is even. The process test shows that the positioning method is simple, less oxide scale, high surface accuracy, suitable for all types of billet diameter less than the die diameter positioning, in line with production requirements.