BOTH- SIDE FRICTION STIR BONDING METHOD, BONDING DEVICE, BONDING METHOD OF METAL PLATE IN COLD ROLLING FACILITY AND COLD ROLLING FACILITY

摘要

Disclosed is a both-side friction stir bonding method wherein a bonding strength is increased and the reliability of the bonding strength is enhanced by minimizing fracture and poor bonding of a metal plate when the metal plate having a thickness smaller than the diameter at the shoulder portion of a rotary tool is subjected to both-side friction stir bonding, and furthermore the lifetime of the tool is improved and the economy of the rotary tool is improved. Rotary tools (5, 6), which are arranged opposite to the front surface side and the back surface side at the joint (J) of two metal plates (1, 2), respectively, are moved to approach each other while the front and back surfaces of the metal plates (1, 2) are grasped by means of grasping devices (7, 8) on the input and output sides, to thereby provide a predetermined clearance δ between the distal ends of the probes (13a, 13b) of the upper and lower rotary tools (5, 6) and press the shoulder portions (5b, 6b) of the rotary tools (5, 6) against the front and back surface sides at the joint (J). In this state, the upper and lower rotary tools (5, 6) are moved along the butting portion (J) while rotated, thus performing friction stir bonding. Friction stir bonding is carried out while the shaft center (14) of the upper and lower rotary tools (5, 6) is inclined with respect to the advancing direction of the rotary tools (5, 6) in the direction in which the respective probes (13a, 13b) precede.