The pressure hardening process of carburized steel bearing rings hasshort process procedures,high production efficiency, fine hardened quality and other advantages, Some key teehnique of the process, such as movable hardening dies, "die limit"regu-larities and press adjustment are in troduced in details in the paper.
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No wonder many of today's philanthropists aim, as Carnegie did, to give away all their money by the time they die, or at least put a time limit on the lifespan of their foundation after their death.
难怪今天很多慈善家像卡耐基那样立志在离开人世前散尽家财，或者至少为他们死后其基金会的寿命画上一个时间界限。
Limit location pole was designed complementally, which played an important role in the normal work of the die and the material flow inside the workpiece.
补充设计了限位柱，对于模具的正常工作和工件内部的材料流动起到了重要的作用。
Through theoretical analysis, probability revisal and experimental test, the limit drawing ratio of a tapered cup drawn by cylinder convex punch and tapered concave die is determined in tis paper.
通过理论分析，概率修正和实验验证，确定出利用柱形凸模、锥形凹模一次拉深锥形件的极限拉深比。
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