公开(公告)号：US20010002559A1

公开(公告)日：2001-06-07

申请号：US09774050

申请日：2001-01-31

申请人： MITSUBISHI MATERIALS CORPORATION

发明人： Yasuyoshi Fujii ,  Seiji Matsuura ,  Kazuhiro Kaneko

IPC分类号： B21K005/04

CPC分类号： B23B31/005 ,  B23B51/00 ,  B23B51/02 ,  B23B2231/0204 ,  B23B2240/28 ,  B23B2251/02 ,  B23B2251/426 ,  B23P15/32 ,  Y10T29/49833 ,  Y10T29/49945 ,  Y10T403/4949 ,  Y10T403/4966 ,  Y10T408/907

摘要： A method for producing cutting tools incorporated in the present invention is carried out as follows: a shank portion and a drill portion are formed separately such that the inner diameter of a hole made in the shank portion is slightly smaller than the outer diameter of the drill portion. The rear of the drill portion is forcibly inserted into the hole of the shank portion at normal temperature which is room temperature. The diameter of the inner wall of the hole is thereby enlarged, resulting in a tight fitting. After the insertion of the drill portion in the shank portion, the drill portion may be ground to form a drill edge. Before the insertion of the drill portion in the shank portion, the shank portion may be quenched under vacuum or the like, or the surface of the shank portion may be hardened by nitriding.