在多工位自动冷镦机上生产台阶杆形工件易产生如图1A所示的缺陷。怎样才能解决这一问题呢?几年来我们结合生产进行试验,取得了一定经验。一、镦锻过程中的金属流动规律图2表示冷镦锻汽车轮壳螺柱(毛坯)时金属在模具内的流动情况。由于选用的坯料与凹模腔直径d接近(略小0.05～0.1毫米),所以在镦锻过程中,坯料首先在凹模端面形成环 In the multi-station automatic cold heading machine to produce step bar-shaped workpiece is easy to produce defects as shown in Figure 1A. How can we solve this problem? In recent years, we have experimented with production and gained some experience. First, the upsetting process of metal flow rule Figure 2 shows the upset forging car wheel stud (blank) metal flow in the mold. As the selection of the blank and the cavity diameter d close to (slightly smaller than 0.05 to 0.1 mm), so upsetting process, the blank first in the die face to form a ring