| 摘要 |
PURPOSE: To provide such an edge preparation method that reduces flash formed by the edge preparation as less as possible so as to reduce working load. CONSTITUTION: When edge preparation is performed on shaped steel by a cutting means 7L, 7R consisting of drive-in cutters 9L, 9R, scallop cutters 11L, 11R, and edge preparation cutters 13L, 13R, edge preparation is performed by the drive-in cutters 9L, 9R, the scallop cutters 11L, 11R, and the edge preparation cutters 13L, 13R in such a state as driving in the shaped steel by drive-in quantity (Lo-α), which is less than a preset set quantity Lo by a finely little quantity, and secondarily the shaped steel (W) is edge prepared by the cutting means 7L, 7R in such a state as driving in the shape steel (W) by drive-in quantityα.
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