GB881010A - Improvements in power presses - Google Patents

Abstract

881,010. Making vehicle axles; stamping. RUBERY OWEN & CO. Ltd. April 28, 1960 [Jan. 30, 1959], No. 3328/59. Classes 83 (4) and 83 (2). The ram or slide of a power press for the production of pressings each forming one half of a vehicle axle is provided with control pins for the blank which are movable in a direction parallel to the line of movement of the ram or slide and are loaded by compressed-air at substantially constant pressure. The pressing 10 is formed between a stationary bottom tool 11 mounted on a plate 12 secured to a bed 13 and a reciprocable top tool 14, mounted on a top plate 15 actuated by a ram 16. The top tool carries guide pins 17 working through bushes 18 in the bottom tool 11. After the forming operation the pressing is ejected from the bottom tool by lifter pins 19. Control of the pressing is effected by headed control pins 20 which are engaged by pins 22 extending downwardly from a transverse bar 23 vertically slidable in the ram 16. The bar is loaded at its ends by the piston-rods 24 of compressed-air cylinders 25 (Fig. 5), in which the pressure is maintained constant. The pins engage the blank after the top tool has moved downwardly through a predetermined distance and locate the blank positively and accurately in the bottom tool during the rest of the movement of the top tool. On completion of the pressing operation the top tool moves upwardly but the control pins 20 remain in engagement with the pressing and strip the pressing from the top tool. During ejection of the pressing from the bottom die by the lifter pins 19 the control pins continue in engagement with the pressing thus effecting a smooth release of the pressing and minimizing the risk of distortion,