发明名称 |
Verfahren zur Herstellung von geripptem Metallrohr |
摘要 |
1,240,380. Making tubes; drawing. NIPPON KOKAN K.K. 11 July, 1969 [13 July, 1968], No. 34949/69. Headings B3A and B3P. A longitudinally finned metal tube 2, Fig. 6, is made from a tube blank by forming a thickened portion on the tube at the region where each fin is to be formed and cold drawing the formed tube through a fin-forming die 5 using a cylindrical plug 11. The tube is formed with the thickened portions by rolling or drawing. In the latter case a circular die 8, Fig. 3, is used with a shaped plug 7, the plug may have an elliptical, generally rectangular or sector crosssection. |
申请公布号 |
DE1935357(A1) |
申请公布日期 |
1970.10.29 |
申请号 |
DE19691935357 |
申请日期 |
1969.07.11 |
申请人 |
NIPPON KOKAN KABUSHIKI KAISHA |
发明人 |
ODAKI,MASAHARU;KONNO,TAKASHI;MOCHIZUKI,TATSUYA;YOKOHAMA,KANAGAWA;NAKAHARA,OSAMU;HASHIMOTO,MAKOTO |
分类号 |
B21C1/00;B21C37/20;B21H7/14 |
主分类号 |
B21C1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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