GB783043A - Improvements relating to the grooving of pipe by rolling - Google Patents

Abstract

783,043. Rolling; shearing. VICTAULIC CO. OF AMERICA. Dec. 8, 1955, No. 35275/55. Class 83 (4). [Also in Group XXVIII] Annular pipe coupling grooves 4, Fig. 2, of rectangular section are accurately formed on the outer surface of a pipe 1 by a roll 7 with an annular rib 8 while the flow of metal from the groove is controlled as by a supporting roll 11 which engages the pipe on each side of the groove. Alternatively the groove may be progressively formed by a series of rolls 35, Fig. 4, 42, Fig. 5, radially disposed about the tube and having progressively wider annular ribs 38, 43. Cylindrical portions 39, 44 serve to work back any metal flowing outwardly from the groove. In another example the groove is formed by a roll 54, Fig. 7, having cut-away grooves 56 on each side of the rib 55 which permit radial outward flow of metal near the edges of the groove. A backing roll 58 with a concave section 60 controls the outward flow to form thickened portions 62 on each side of the groove. The inside of the tube may be supported by a mandrel 52 but this may be omitted in larger diameter tubes where a reduction of internal diameter is permissible. A tool for carrying the rollers comprises a housing 26, Fig. 14, with a slidable holder 28 actuated by a screw 29. The pipe end is located by an adjustable end stop comprising a threaded bolt 80 in an end-plate 75 attached to one end of a roll shaft 71 by threaded nut 76. In a further modification a roll shaft 81, Fig. 15, has a pipe end cutter 83 attached at one end so that the operations of cutting and grooving may be carried out simultaneously.