| 摘要 |
Accurate dimensional control in ultrasonic welding or upsetting of plastic parts is accomplished by the method and apparatus for monitoring the ultrasonic head displacement and sensing when a predetermined trigger force is applied to the part or parts, turning on the ultrasonic energy at the trigger point and terminating the ultrasonic energy when head displacement from the trigger point reaches an empirically established value, holding the force for a hold time and measuring the maximum displacement value at the end of the hold time, releasing the force when the force returns to the trigger point, measuring the overall displacement, and determining whether the overall displacement is within allowable tolerance values. Weld time and weld energy as well as the overall head displacement are monitored for comparison with preset tolerance values to determine acceptability of the part being processed.
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