Patent ID: 6835346
Filing Date: 2004-12-28
Classification: B29C,B29L,B60R

Abstract:
A method of processing a linear groove in an air bag portion of a resin skin for a vehicle, the resin skin having a front face and a rear face, the linear groove being processed in a side of the rear face of the resin skin in a condition where a predetermined thickness is left on a side of the front face thereof, the method utilizing an ultrasonic processing apparatus and comprising the steps of:fixedly holding the front face closely in contact with a flat face; adjusting the position of an oscillating horn of the ultrasonic processing apparatus disposed on the side of the rear face of the resin skin for forming a clearance between a front end of the oscillating horn and the flat face coincident with the predetermined residual thickness on the side of the front face of the skin; relatively moving in a direction of the linear groove to be processed the ultrasonic processing apparatus; sequentially applying ultrasonic vibration to the side of the rear face of the air bag portion of the resin skin, thereby sequentially fusing and removing a resin for the skin of a portion to which the ultrasonic vibration is applied, to process the linear groove, wherein cooling air is blown to a resin skin portion immediately after the linear groove is processed by the ultrasonic vibration, to cool and harden the fused resin portion which is removed to sides of the linear groove.