Patent GB-1080325-A (GB)
Title: Friction welding
IPC: B23K20/12
Filed: 1964-09-16
Abstract: 1,080,325. Welding by pressure. AMERICAN MACHINE & FOUNDRY CO. Sept. 16, 1964 [Oct. 2, 1963], No. 37790/64. Heading B3R. A friction welding machine comprises a headstock in which a first workpiece holding chuck is rotatably mounted, tubular guides extending from the headstock on which guides is slidably mounted a tailstock carrying a second workpiece holding chuck, transverse pins extending through the tailstock and through longitudinal slots in the guides and a fluid pressure cylinder within each guide, the pistons of the cylinders being attached to the transverse pins. The headstock 10 comprises a horizontal bottom wall 13 and a vertical back wall 14 which support cylindrical portions 17, 18 in which are fixed the tubular guides 19, 20. A notched foot 12 supports the free ends of the guides 19, 20 and the tailstock 11 is slidably arranged on the guides by means of cylindrical portions 42, 43. An hydraulic advance and pneumatic return cylinder is arranged in the headstock end of each guide, being fixed to an end cap 21, 22 and the piston rods of the cylinders are connected to pins 45 fixed transversely in the portions 42, 43 and slidable in the slots 40 in the guides. Bosses 28, 29 in the headstock house bearings to rotatably support a tubular arbor 32 carrying a chuck 33 at one end and a pulley 35 at the other. A pneumatic motor of the vane or piston type is bolted to the headstock 10 and drives the arbor by a belt 39. Flywheels 54 are clamped to the arbor and a chuck 51 is secured to the tailstock. A control system, Fig. 7 (not shown) is provided wherein air flows from filter (61), through pipes (63), (64) to valves (65), (66), the valve (65) supplying the pneumatic arbor driving motor (36) through a pressure regulating valve (69) and an intensifier (79) through a valve (70). The valve (66) supplies air to the return end of the cylinders (25) in the guides and to an air-oil pump (89) for exerting a low pressure on oil flowing through a two-way valve (91) connected to the supply pipes (82), (84) from the intensifier to the working side of the cylinders (25). In operation, the valve (91) is opened to connect the pump 89) with the intensifier (79) and valve (66) is operated to supply air to the cylinders (25) to move the tailstock from the headstock, hydraulic fluid from the cylinders (25) forcing the piston (94) of the pump (89) to the left and the piston of the intensifier to the right. The workpieces, e.g. steel and titanium are fitted in the chucks and valve (66) is operated to direct air through pipe (88) to the pump (89) which causes the piston in the cylinders (25) to bring the tailstock towards the headstock and with the workpieces spaced the valve vents the cylinder (25) and pump (89) and valve (91) is closed. Valve (65) is then operated to direct air to the motor (36) to bring the workpiece up to the desired speed and valve (65) then is operated to supply air to the intensifier which causes the workpieces to be brought into contact. The motor may be shut off or allowed to stall, the inertia in the flywheel etc. completing the weld. A hand-operated lever device operating in an H-slot may be employed to operate the valves.