EP 0589104 A1 19940330 - Method of producing tubing.
Title (en)
Method of producing tubing.
Title (de)
Verfahren zum Herstellen eines Rohrs.
Title (fr)
Procédé de fabrication d'un tube.
Publication
Application
Priority
EP 92308616 A 19920922
Abstract (en)
The invention relates to steel tubing having a contoured pattern embossed on its external surface and is particularly concerned to provide such patterns on mild steel tubing. A method is provided, of making mild steel tubing(21) having a contoured pattern(11) on its external surface, in which flat mild steel strip(10) of width corresponding to the outside diameter of the desired tubing(21) is passed through embossing rolls which emboss a contoured pattern(11) on one surface of the strip, the embossed strip is passed through shaping rolls(13, 14) which shape the strip to tubular form(21) with the embossed pattern outermost, the opposed longitudinal edges(16, 17) of the tubular form are subjected to high frequency induction heating and the heated edges are press-forged together to form a longitudinally-extending welded joint(20). <IMAGE>
IPC 1-7
IPC 8 full level
B21C 37/08 (2006.01); B21C 37/083 (2006.01)
CPC (source: EP)
B21C 37/08 (2013.01); B21C 37/083 (2013.01)
Citation (search report)
- [X] US 3918626 A 19751111 - MCLAIN CHARLES D
- [Y] DE 3326010 A1 19850124 - MANNESMANN AG [DE]
- [X] US 3858785 A 19750107 - MCLAIN CHARLES D
- [X] EP 0164233 A2 19851211 - ALLIED TUBE & CONDUIT CORP [US]
- [X] CH 433168 A 19670415 - HACKETHAL DRAHT & KABELWERK AG [DE]
- [X] PATENT ABSTRACTS OF JAPAN vol. 7, no. 44 (M-195)22 February 1983 & JP-A-57 193 226 ( SUMITOMO KINZOKUKOGYO ) 27 November 1982
- [X] PATENT ABSTRACTS OF JAPAN vol. 9, no. 191 (M-402)(1914) 7 August 1985 & JP-A-60 56 418 ( SANOU KOGYO K.K. ) 2 April 1985
Designated contracting state (EPC)
DE ES FR GB IT NL SE
DOCDB simple family (publication)
EP 0589104 A1 19940330; EP 0589104 B1 19971126; DE 69223320 D1 19980108; DE 69223320 T2 19980409
DOCDB simple family (application)
EP 92308616 A 19920922; DE 69223320 T 19920922