Ultrasonic press using servo motor with delayed motion

Details Ultrasonic press using servo motor with delayed motion Ultrasonic press using servo motor with delayed motion

2009-04-03

2011-11-08

Koch, George (Department: 1745)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S073100, C156S073400

Reexamination Certificate

active

08052816

ABSTRACT:
An ultrasonic welding method includes the acts of pressing an ultrasonic welding stack mounted for linear movement against a first workpiece using an electrical servo motor, applying a predetermined initial load to the first workpiece, and initiating a weld, the initiating of the weld comprising outputting energy from the ultrasonic welding stack to the first workpiece. The method further includes sensing, with at least one sensor, a control variable, outputting a signal corresponding to the sensed control variable to a controller, simultaneously outputting energy from the ultrasonic welding stack to the first workpiece and maintaining a weld distance at or near zero until the signal corresponding to the sensed control variable satisfies a predetermined condition, and applying a controlled force, speed, or a combination of force and speed to said first workpiece with an electrically powered linear actuator to urge said first workpiece against a second workpiece to which said first workpiece is to be joined following satisfaction of said predetermined condition.

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Michaeli W et al.: “Bessere Nahtqualitaet Beim Ultraschallschweissen.\Better Weld Quality in Ultrasonic Welding”, Kunststoffe, Carl Hanser Verlag, Munchen, DE, vol. 83, No. 9, Sep. 1, 1993, pp. 667-670.
“Ultrasonic Metal Bonding System Bonding Process.” ULTEX: Ultrasonic Laboratory. Sep. 7, 2005 (1 page).

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