초록 ▼

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

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.

대표청구항 ▼

A method of dimensional control in ultrasonic processing of work comprising one or more plastic parts to be deformed, comprising the steps of; applying force to a surface of the work and sensing a preset force value, when the preset force value is attained, measuring the surface position to establis

A method of dimensional control in ultrasonic processing of work comprising one or more plastic parts to be deformed, comprising the steps of; applying force to a surface of the work and sensing a preset force value, when the preset force value is attained, measuring the surface position to establish an initial dimension and initiating ultrasonic energy application to the work, monitoring surface displacements occurring after initiating the ultrasonic energy, terminating ultrasonic energy when the surface displacement reaches a preset value, then maintaining force on the surface for a hold period and thereafter releasing the force, and measuring overall surface displacement after the hold period when the force is at the preset value, thereby determining the dimensional change due to deformation of the work.