| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cross punch capable of suppressing the wear of a punch to make a long life. <P>SOLUTION: The cross punch for forming a cross recess in one end of a forming member includes; a bottom face part 11a corresponding to the form of one end of the forming member: a cross-like part for protruding to make a cross shape from the bottom face part 11a: and a cross arrowhead part 11b as a head part having an apex P projected to have a weight from the edge of the cross-like part. A plane orthogonal to a height direction of the cross arrowhead part 11b and passing the boundary of a cross arrow conical part 11c and the cross arrowhead part 11b passes the apex and the boundary and the angle making a straight line on which the distance between the apex and the boundary is minimum is 0.0-25.0°. <P>COPYRIGHT: (C)2012,JPO&INPIT |
