象图1所示的零件,由干杆部很长,用一般方法在摩擦压力机上镦制是不可能的。我们起初接到这批零件时,不得不采用手工锻造法。后来经过赵子文等同志研究,改进一付模具,终于可以在摩擦压 Parts like the one shown in Fig. 1 are very long by the stem, which is not possible with the usual method of upsetting on a friction press. When we first received these parts, we had to use the manual forging method. Later, after comrades Zhao Zicheng and other studies to improve a pair of molds, and finally friction pressure