公开(公告)号：US5297409A

公开(公告)日：1994-03-29

申请号：US902248

申请日：1992-06-22

申请人： Danny L. Beaman ,  Kenneth R. Christie ,  Dennis M. Cordy ,  Craig W. Graham ,  Steven W. Lightle ,  Michael L. Watts

发明人： Danny L. Beaman ,  Kenneth R. Christie ,  Dennis M. Cordy ,  Craig W. Graham ,  Steven W. Lightle ,  Michael L. Watts

IPC分类号： B23P9/02 ,  B21D39/08

CPC分类号： B23P9/025 ,  Y10T29/49863

摘要： A hole is formed in a high-strength steel part and a lubricant consisting essentially of one or more metal powders, preferably of nickel or molybdenum; a metal powder which is more reactive than the steel of the workpiece such as zinc; and an organic medium is applied. A forming mandrel having a generally cylindrical shape with a frustoconical portion on either end is centered over the hole. The mandrel is pushed through the hole at a rate such that the steel adjacent the hole is coldworked and its microstructure is transformed from an austenitic to a normal tempered martensitic structure.

摘要翻译： 在高强度钢部分和基本上由一种或多种金属粉末，优选镍或钼组成的润滑剂中形成孔; 比锌等工件的钢更具反应性的金属粉末; 并施加有机介质。 具有大致圆柱形形状的成形心轴，其两端具有截头圆锥形部分，位于孔的上方。 心轴以一定的速度推动穿过孔，使得邻近孔的钢被冷加工并且其微结构从奥氏体转变为正常回火马氏体结构。