| 摘要 |
PURPOSE:To secure a smooth weld with nonconcentration of stress, by first grinding the weld of special steel strips connected by laser beam welding with a grinding wheel large in grains size and then grinding it with such one as being small in the grain size. CONSTITUTION:Sf shows a preceding strip, Sb a succeeding strip and W a weld line after being welded by laser beam, respectively. A rough grinding device is provided with a rough grinding wheel 1a at 1a-10a while a finish grinding device with a finishing grinding wheel 1b at 1b-10b in the same construction, respectively, and both are situated at the upper side of these strips. At the underside of the strip, there is possible for only finish grinding. And, each grinding wheel is moved along a weld line W pointing to a steel strip width direction, thus grinding takes place. In this case, the moving direction is made to be such one as being ground first with the rough grinding wheel 1a and then with the finish grinding wheel 1b. With this constitution, at various continuous welding line for these steel strips, stop time at the lead-in side of a line is shortened, whereby continuous feed to a processing section is performable and, what is more, there is no plate breakdown, thus rolling and bending are attainable and not only productivity but yield rate are improved. |
