Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for Manufacture of tubes of special shape

BPERFORMING OPERATIONS TRANSPORTING B21Mechanical metalworking B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL

B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for Manufacture of tubes of special shape

B21C37/02of sheets B21C37/04of bars or wire B21C37/042Manufacture of coated wire or bars B21C37/045Manufacture of wire or bars with particular section or properties B21C37/047of fine wires B21C37/06of tubes or metal hoses Combined procedures for making tubes B21C37/065starting from a specific blank B21C37/08Making tubes with welded or soldered seams B21C37/0803the tubes having a special shape B21C37/0807Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines B21C37/0811removing or treating the weld bead B21C37/0815without continuous longitudinal movement of the sheet during the bending operation B21C37/0818Manufacture of tubes by drawing of strip material through dies B21C37/0822Guiding or aligning the edges of the bent sheet B21C37/0826Preparing the edges of the metal sheet with the aim of having some effect on the weld B21C37/083Supply, or operations combined with supply, of strip material B21C37/087using rods or strips of soldering material B21C37/09of coated strip material; Making multi-wall tubes B21C37/10Making tubes with riveted seams or with non-welded and non-soldered seams B21C37/101Making of the seams B21C37/102of coated strip material (making multi-wall tubes) B21C37/104the tubes having a special shape B21C37/105Supply, or operations combined with supply, of strip material B21C37/107Tube treating or manipulating combined with or specially adapted for use in connection with tube-making machines B21C37/108without continuous longitudinal movement of the sheet during the bending operation B21C37/12Making tubes or metal hoses with helically arranged seams B21C37/121with non-welded and non-soldered seams B21C37/122with welded or soldered seams B21C37/123of coated strip material; Making multi-wall tubes B21C37/124the tubes having a special shape B21C37/125curved section B21C37/126Supply, or operations combined with supply, of strip material B21C37/127Tube treating or manipulating combined with or specially adapted for use in connection with tube making machines B21C37/128Control or regulating devices B21C37/14Making tubes from double flat material B21C37/15Making tubes of special shape Making tube fittings B21C37/151Making tubes with multiple passages B21C37/152Making rifle and gunbarrels B21C37/153Making tubes with inner- and/or outer guides B21C37/154Making multi-wall tubes B21C37/155Making tubes with non circular section B21C37/156Making tubes with wall irregularities B21C37/157Perforations B21C37/158Protrusions B21C37/16Making tubes with varying diameter in longitudinal direction B21C37/18conical tubes B21C37/185starting from sheet material B21C37/20Making helical or similar guides in or on tubes without removing material B21C37/202with guides parallel to the tube axis B21C37/205with annular guides B21C37/207with helical guides B21C37/22Making finned or ribbed tubes by fixing strip or like material to tubes B21C37/225longitudinally-ribbed tubes B21C37/24annularly-ribbed tubes B21C37/26helically-ribbed tubes B21C37/28Making tube fittings for connecting pipes B21C37/283Making U-pieces B21C37/286starting from sheet material B21C37/29Making branched pieces B21C37/292Forming collars by drawing or pushing a rigid forming tool through an opening in the tube wall B21C37/294Forming collars by compressing a fluid or a yieldable or resilient mass in the tube B21C37/296Making branched pieces starting from strip material; Making branched tubes by securing a secondary tube in an opening in the undeformed wall of a principal tube B21C37/298Forming collars by flow-drilling B21C37/30Finishing tubes