Document Type and Number:
Japanese Patent JPS4834664
Kind Code:
B1
Abstract:
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.
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Application Number:
JP4884568A
Publication Date:
October 23, 1973
Filing Date:
July 13, 1968
Export Citation:
International Classes:
B21C37/20; B21C1/00; B21H7/14; (IPC1-7): B21C37/20