Control apparatus and method for progressive fracture of...

B - Operations – Transporting – 23 – D

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B23D 36/00 (2006.01) B21D 28/20 (2006.01) B23D 31/00 (2006.01) B26D 5/00 (2006.01) B30B 15/22 (2006.01) B30B 15/26 (2006.01)

Patent

CA 2045637

A control apparatus (10) and method for progressively fracturing a workpiece from a material sheet in a press (12) in which a ram (28) is progressively advanced through the thickness of the material sheet in discrete steps, each of the discrete steps including an advance of the ram (28) into the material sheet a predetermined distance less than the total thickness of the sheet, a stopping of the advance of the ram (28), a relief of the pressure built up in the press (12) due to the pressurized advance of the ram (28) and a subsequent advance of the ram (28) through the material sheet. A distance measuring transducer (48) generates an output indicative of the position of the piston (24) of the cylinder (14) and the ram (28) during movement of the ram. A controller (34), in response to a stored control program and the output of the distance measuring transducer (48), controls the operation of fluid valves (57, 62) to supply pressurized fluid to the cylinder (14) to reciprocate the ram (28). The controller (34) controls pressure regulating valves (114, 116, 118, 120, 122) to supply fluid at a plurality of discrete pressures to the cylinder (14) throughout each cycle of operation of the press (12).

Appareil de contrôle (10) et méthode de fragmentation progressive d'une pièce à partir de matériau en feuille dans une presse (12) dans laquelle un bélier (28) pénètre progressivement, pas à pas, à travers l'épaisseur de matériau en feuilles, chacun des pas comportant un mouvement d'avance de piston (28) dans la feuille de matériau sur une distance prédéterminée moins l'épaisseur totale de la feuille, un arrêt de l'avance du piston (28), un relâchement de la pression dans la presse (12) à cause de l'avance pressurisée du piston (28) et une avance subséquente du piston (28) à travers la feuille de matériau. Un transducteur de mesure de distance (48) génère une sortie indiquant la position du piston (24) du cylindre (14) et du bélier (28) durant le mouvement du bélier. Un contrôleur (34), en réaction aux commandes d'un logiciel en mémoire et à la sortie du transducteur de mesure de distance (48) commande le fonctionnement de robinets de fluide (57, 62) afin d'alimenter le cylindre (14) en fluide sous pression pour imprimer au bélier (28) un mouvement de va et vient. Le contrôleur (34) commande les soupapes de régulation de pression (114, 116, 118, 120, 122) afin d'alimenter le cylindre (14) en fluide à une pluralité de pressions discrètes, à chaque cycle de fonctionnement de la presse (12).

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