| 摘要 |
<p>The object of the present invention is to improve the appearance of a vehicle body and to reduce the manufacturing cost that involves bonding face plates having ribs formed on one side surface thereof through friction stir bonding. Actually, plural extrusion members 100 each having plural ribs 105 formed on one surface of a face plate 101 are mounted on a frame 40 with the surface not having the ribs 105 facing downward, the end regions of the adjacent members 100, 100 being butted to each other, friction stir bonding the end regions of said members 100 from the upper direction with a rotary body 20, and then providing a hairline finish to said surface not having the ribs, which constitutes the exterior surface of the vehicle body. According to the invention, there is substantially no need to cut off the joint bead, which improves the appearance of the vehicle body and reduces the manufacturing cost. <IMAGE></p> |
