WELDING DEVICE AND WELDING METHOD

摘要

A compact pressing body with a pressing surface smaller in area than a welding range welds together sheet-like members over the whole area of the welding range by pressing the sheet-like members being reliably moved in a direction substantially orthogonal to a pressing direction of the pressing body.

主权项

1. A welding apparatus for welding together a plurality of overlaid sheet-like members by pressing in conjunction with application of vibration, comprising:
a backup member including a backup surface; a pressing body including a pressing surface smaller in area than a welding range of the sheet-like members, and operative to press the sheet-like members against the backup surface in a pressing direction by means of the pressing surface; movement means for moving a portion of the sheet-like members that faces the pressing surface relative to the pressing surface in a direction substantially orthogonal to the pressing direction; and vibration generating means for vibrating the pressing body, wherein the vibration generating means comprises: an oscillator which applies ultrasonic vibration to the sheet-like members from the pressing surface by inducing the ultrasonic vibration in the pressing body; and a pressuring part for pressuring the sheet-like members by pressing the sheet-like members against the backup surface by means of the pressing surface of the ultrasonically vibrating pressing body, and wherein the pressuring part drives the pressing body, ultrasonically vibrated by the oscillator, to repeatedly pressure the sheet-like members during a predetermined pressuring time in one cycle of a preset low-frequency vibration period while maintaining the pressing body in low-frequency vibration with the low-frequency vibration period in a vibrational direction parallel to the pressing direction.