Patent ID: 7383976
Filing Date: 2008-06-10
Classification: B23K

Abstract:
1. A friction stir spot joining device for softening and stirring workpieces to be joined by frictional heat generated by rotation of a pin, comprising: a stirring motor for rotating a joining tool holding the pin; a pressure application motor for linearly driving the joining tool; a pin extraction motor for causing the pin to move axially in and out of a tip end portion of the joining tool and connected to a rear end portion of the stirring motor along a common axis line to be integrated therewith; a driving unit body housing the integrated pin extraction motor and stirring motor and a direct action bearing rail therein; and a direct action bearing body fixedly attached to a side of the pin extraction motor, wherein the stirring motor is retained by the direct action bearing rail and the pressure application motor is disposed at the rear of the pin extraction motor such that the pin extraction motor and the stirring motor are simultaneously moved when the pressure application motor is driven.