| 摘要 |
PURPOSE:To improve the butting accuracy of a groove by butting a butting surface of a butted following plate, to a preceding plate positioned by a following lower clamper which can move upward and downward, and forward and backward, after its butting surface has been ground by a prescribed finish allowance. CONSTITUTION:The end face of a preceding plate 1 which has been fed to a position of a preceding clamper 3 after cutting it by a cutting means (b) of a shear cutting edge, etc. is pressed against a stopper 8 which has been attached to the side face of a lower clamp base 2 which has been made to ascend, and the rear end part of the preceding plate is positioned. In this case, an adjusting block 9 is interposed in advance between the preceding lower clamp base 2 and the following lower clamp base 2'. Next, a cut surface of the tip part of the following plate 1' is butted to a cut surface of the preceding plate 1, and both the opposed surfaces are ground by a rotary grindstone 11 by leaving only a thickness of the adjusting block 9 as a finish allowance, and butted and welded by a laser. In this way, a groove having a high accuracy can be obtained. |
