公开(公告)号：EP1433549A4

公开(公告)日：2005-10-05

申请号：EP02772930

申请日：2002-09-26

申请人： HONDA MOTOR CO LTD

发明人： WATANABE TAKAO ,  ONUMA TOSHIAKI ,  UEDA YOSHIMI ,  SASAKI TAKESHI

IPC分类号： B22D1/00 ,  B22D27/18 ,  B22D27/20 ,  C21C1/04 ,  C21C1/08 ,  C21C7/04 ,  B22D15/00

CPC分类号： B22D1/00 ,  B22D1/007 ,  C21C1/04 ,  C21C1/08 ,  C21C7/04 ,  Y02P10/216

摘要： The melt of cast iron containing a nitrogen-scavenger premixed in the initial material and added through a weighing hopper 26 is cooled and solidified in a cavity mold of a molding apparatus 18 to produce a molded article B. The free N in the melt is rapidly captured by the nitrogen scavenger before the cooling and solidification are progressed, and nitrides are produced resultantly. The chill structure formed in the surface portion of the molded article B is decomposed by subjecting the molded article B to a heat treatment. At the last step, the molded article B subjected to the heat treatment is machined, thus producing a camshaft A as a cast iron member which is a finished article.