工农12型手扶拖拉机中的尾轮总成外套管组合件中有一个圆环,是用直径5毫米的A3圆钢弯成为内径50毫米的环。为制造此环,我们设计了一副冲环模,经生产实践证明效果很好。卷料是用圆钢切断模在15吨冲床上下成172.7~(±0.5)毫米的坯料。模具结构与原理(见图):模具由上模的冲头、下模的活动凹模组成。下模中的活动凹模16是两个φ112厚30毫米的活动转子,它固定在凹模固定 The tail wheel assembly in the Worker-Peasant Type 12 Walking Tractor has a ring in the outer sleeve assembly bent into a 50 mm ID with a 5-mm diameter A3 round. To create this ring, we designed a punch die, the production proved very effective. Roll material is cut with a round steel punch in the 15 tons up and down into a 172.7 ~ (± 0.5) mm of the blank. Die structure and principle (see photo): Die by the punch on the die, the die activities Die. The movable die 16 in the lower die is two movable rotors, φ112 and 30 mm thick, which are fixed in a die holder