Patent ID: 6832713
Filing Date: 2004-12-21
Classification: B23K

Abstract:
A spot joining device comprising:a joining tool having a column-shaped shoulder portion at a tip end portion thereof and a pin protruding from an end face of the shoulder portion along an axis thereof; a frame having a first portion and a second portion fixed to a lower end of the first portion to extend downwardly in a substantially L-shape; a linear guide provided on the first portion of the frame for guiding the joining tool to be movable upwardly and downwardly along the axis thereof; a rotation motor for rotating the joining tool around the axis thereof; a motion motor for moving the joining tool along the axis thereof, and a column shaped receiving member provided in a tip end portion of the second portion of the frame such that an upper end surface thereof is opposed to the joining tool, and configured to receive lapped works, wherein the joining tool is moved along the axis by the motion motor while the joining tool is rotated by the rotation motor, the pin and the shoulder portion are pressed against a predetermined joint spot of the lapped works to be joined and inserted into the predetermined joint spot heated and softened due to friction heat, portions of the lapped works that are in the vicinity of the predetermined joint spot are stirred by using the rotating pin and shoulder portion, thereby leading to the lapped works being fused at the predetermined joint spot, the joining tool is then pulled out along the axis by the motion motor, the joining tool is substantially prevented from moving in a direction crossing an axial direction thereof with respect to the lapped works from the time when the pin and the shoulder portion are pressed against the predetermined joint spot of the lapped works to the time when the joining tool is pulled out, and whereby the lapped works are spot-joined at the predetermined joint spot.