GB1209106A - Automatic machine for preparing the ends of metal tubes for a drawing operation - Google Patents

Abstract

1,209,106. Drawing. SOC METALLURGICA ITALIANA. 8Nov., 1968 [9 Nov., 1967], No. 53054/68. Heading B3P. A machine for preparing a tube 6 for drawing comprises a lower die 4 for seating the tube end 5, a pair of side punches 18 for producing a pair of depressions in the tube to locate a mandrel 10 pushed into the tube from a magazine 9 by a bar 28 having a central bore 29 through which lubricant is fed into the tube by feeding means 25 prior to introducing the mandrel 10, an upper die 15 to lock the tube end against the lower die 4 and two side punches 21<SP>1</SP> to laterally deform the tube, which side punches 21<SP>1</SP> and the upper die 15 are movable downwardly to reduce the tube diameter. In operation, the upper die 15 and side punches 18 are actuated by hydraulic cylinders 13 and 16 respectively, after which a piston 25 is displaced to cause a rod 26 to slide within a rod 27 thereby ejecting oil through the bore 29 and into the tube end. After returning the piston 25 to its initial position, the bar 28 is moved to the left by a piston 22 to allow the lowermost mandrel 10 in the magazine 9 to drop into register therewith, the mandrel 10 being subsequently pushed into the tube by the bar 28 into contact with the previously formed depressions. Thereafter, the tube end is deformed into an 8-shaped form by the punches 211 operated by hydraulic cylinders 19, and simultaneously cylinder 11 is moved downwards by oil under pressure to cause attached cylinders 19 and 13 to also move downwards thereby deforming the tube end into a cylindrical shape of reduced diameter.