| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide presses for use in ultrasonic welding or other systems for vibrating joining of plastic parts. <P>SOLUTION: The method includes the steps 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, initiating the weld, outputting energy from the ultrasonic welding stack 10 to the first workpiece. The method further includes the steps of sensing, with at least one sensor, a control variable, outputting a signal corresponding to the sensed control variable to a controller, maintaining a weld distance at 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 the first workpiece to energize the first workpiece against a second workpiece to which the first workpiece is to be joined following satisfaction of the predetermined condition. <P>COPYRIGHT: (C)2010,JPO&INPIT |
