公开(公告)号：US20170326620A1

公开(公告)日：2017-11-16

申请号：US15264754

申请日：2016-09-14

申请人： Hyundai Motor Company

发明人： Sung-Hwan Kim ,  Pil-Sung Jang ,  Cha-Hwan Lee

IPC分类号： B21K1/08 ,  B21D28/24

CPC分类号： B21K1/08 ,  B21D28/24 ,  B21D53/845 ,  F16C3/08 ,  F16C3/20

摘要： A method of manufacturing a crankshaft having weight-reducing forged holes can achieve lightening and precise forming by additionally including a punching process of using an individual hydraulic press. The method includes steps of: heating a steel bar, performing busting such that the heated steel bar is disposed in a cavity of a mold to be produced as a first intermediate shape of a crankshaft, performing brokering such that the first intermediate shape is produced as a second intermediate shape, performing finishing such that the second intermediate shape is produced as a third intermediate shape, performing trimming such that the third intermediate shape is produced as a complete shape of the crankshaft by cutting portions other than the shape of the crankshaft, and performing punching such that holes are formed in the complete shape of the crankshaft.