GB968374A - Workpiece indexing means in stud welding apparatus - Google Patents

Abstract

968,374. Welding by pressure. BIRWELCO Ltd. Jan. 16, 1961 [Oct. 15, 1959], No. 34931/59. Heading B3R. Apparatus for effecting axial and rotary movement of a cylindrical workpiece in an apparatus for welding studs to and in angularly spaced positions on the exterior of the workpiece comprising a fixed welding head and means for gripping the workpiece and for turning it about its axis through a predetermined angle after each welding operation includes an abutment angularly and axially offset relative to the welding head and adapted to be engaged by a stud which has been welded to the workpiece so that as the workpiece is turned the engagement of the stud with the abutment causes the workpiece to be advanced axially. A tube 1 supported on adjustable rollers 18, 19 extends through a pair of shoes 12 mounted on arms 13 pivoted at 14 above the tube and acted on by a piston-and-cylinder 15 below the tube for moving the shoes into and out of gripping engagement with the tube. An extension 16 on one arm 13 is coupled to another piston and cylinder device which turns the arms and shoes about the tube axis when the shoes grip the tube. A welding head 8 having means for gravity feeding studs 2 and refractory ferrules 3, is provided above the tube. The spindle 5 supporting the roller 18 carries a smaller roller 4, out of contact with the tube, whose axis is inclined to the tube axis. In operation studs welded to the tube engage the roller 4 which causes the tube to be moved axially forward and the ferrules 3 are broken under the roller 4. Instead of the roller 4 an inclined plate &c., a frusto-conica roller, a cylindrical or frusto-conical roller with its axis intersecting the axis of the workpiece at other than a right-angle &c. may be employed.