| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a heading method by which a plurality of members containing washers can efficiently be produced from one piece of blank without producing scraps by utilizing a multistage former. <P>SOLUTION: In the first process S1, the blank A which has been cut off to a prescribed size is punched to form one piece of a heading blank 1 composed of a disk part 1a and a columnar part 1b projected in a concentric and a unified manner therewith, and in the second process S2, the columnar part 1b is punched out with a piercing tool 17 and cut into a ring-like washer 2 and a columnar body 1c. Thereafter, the washer 2 is taken out while only the residual columnar body 1c is shifted to the third process S3, and in and after the third process S3, the columnar body 1c is formed by the heading into a prescribed shape-cap nut 3 step by step without producing scraps. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
