GB883118A - Hot brass stamping presses - Google Patents

Abstract

883,118. Forging. WILKINS & MITCHELL Ltd., and BAILEY, W. May 30, 1960 [June 6, 1959], No. 19436/59. Class 83 (4). In a press for forming multi-cored brass articles comprising two horizontally opposed dies 10, 11 adapted to be closed upon a hot workpiece by slide means 12 mounted on die plate 17, and opposed slides 18 for core punches operable in the vertical joint plane of the dies, substantially the whole of the closing movement of the dies and the major part of the inward movement of the core punch slides is derived from a double-acting fluid pressure cylinder 31, the final inward movements of the core punch slides and the start of the outward movements of all the slides are derived from the downward and upward strokes of the main press ram 36 and the completion of the outward movements of all the slides is effected by the fluid pressure cylinder. Die 11 is fixed to the plate 17 and die 10 is mounted on a slide 12 coupled through yoke 26, parallel slides 27 and yoke 29 to the piston 30 of double-acting air cylinder 31. Cam blocks 33 on the slides 27 co-operate with inclined cam tracks 34 on the core slides 18 to move the latter inwards simultaneously with the die slide 12. The fixed die 11 and the slides 12, 18 have arcuate inclined surfaces 37 which co-operate with a conical bore on ring 35 carried by the ram 36 to complete the instrokes of the slides. The die plate 17 is supported through rods 24 on a cushion platen 25 which yields during the final part of the downstroke whereby the workpiece held by the dies is pressed over a stationary bottom punch 21. Lever arms 38 on the ring 35 move the slides 12, 18 outwardly on the upstroke of the ram and the final part of the outstroke of the slides is performed by the air cylinder 31. Ejectors 16 actuated by yoke 29 remove the pressing from the die 11.