Method and apparatus of determining the collapse of plastic...

B - Operations – Transporting – 29 – C

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B29C 65/08 (2006.01) B23K 20/10 (2006.01) B29C 65/82 (2006.01)

Patent

CA 2206906

For accurately determining, in real time, the collapse of a thermoplastic workpiece processed in a press, such as an ultrasonic welding apparatus or a vibration welding apparatus, a two-phase method is used. In the calibration phase signals are generated which are responsive to the yielding or displacement of the movable press portion relative to the substantially stationary portion arising from forced engagement of the workpiece within the press. The force responsive displacement value is stored. In the subsequent workpiece processing phase, when the workpiece collapses due to the softening and flowing of thermoplastic material as the workpiece is coupled to vibrations, the previously stored force responsive displacement value is recalled as a correction signal and subtracted from the newly obtained displacement signal related to the same force. The result of the subtraction is a true on-line signal indicative of the collapse of the workpiece as it occurs. -31-

Afin de déterminer de façon précise et en temps réel l'effondrement de pièces thermoplastiques traitées dans une presse, comme un appareil de soudage par ultrasons ou un appareil de soudage par vibration, on utilise une méthode à deux phases. Pendant la phase d'étalonnage, des signaux sont générés en réaction au flambement et au déplacement de la portion mobile de la presse vers la portion stationnaire causée par l'engagement forcé des pièces dans la presse. La valeur du déplacement réactif de la force est enregistrée. Pendant la phase de traitement ultérieure, lorsque les pièces s'effondrent en raison de l'amollissement et de l'écoulement des matières thermoplastiques, à mesure que la pièce est jumelée aux vibrations, la valeur du déplacement réactif de la force est rappelée comme signal de correction et soustraite du nouveau signal de déplacement associé à cette même force. Le résultat de la soustraction est une indication réelle en ligne de l'effondrement de la pièce à mesure qu'il se produit.

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