发明名称 |
METHOD OF PRESS-FORMING TUBULAR MEMBER HAVING IRREGULAR CROSS-SECTIONAL SHAPE, AND TUBULAR MEMBER HAVING IRREGULAR CROSS-SECTIONAL SHAPE, FORMED BY THE PRESS-FORMING METHOD |
摘要 |
<p>A method of press-forming a tubular part having a cross section of an irregular shape crushes a steel tube between an upper die and a lower die in order to form a V-shaped cross section. When the curvature radius of a tip of the upper die is defined as R 1 , the curvature radius of a bottom portion of the lower die corresponding to the tip of the upper die is defined as R 2 , and the wall thickness of the steel tube is defined as t; R 1 , R 2 , and t satisfy R 1 +2t=R 2 and 1.5t‰¤R 1 ‰¤3t.</p> |
申请公布号 |
KR20100123749(A) |
申请公布日期 |
2010.11.24 |
申请号 |
KR20107021850 |
申请日期 |
2009.05.12 |
申请人 |
NIPPON STEEL CORPORATION |
发明人 |
FUKUSHI TAKAAKI;ANAI ISAO;YAMAMOTO YASUSHI;NAKAMURA HIDEYUKI;KADOMA YOSHIAKI;HORI NAOKI |
分类号 |
B21D22/02;B21D7/00;B21D53/88;B60G9/04 |
主分类号 |
B21D22/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|