| 摘要 |
PURPOSE:To improve operation performance and working efficiency by varying the feed speed by detecting that each cutter reaches the prescribed work starting and completion positions, during the feed operation of a gear box onto which a plurality of cutters having different feed speed are installed. CONSTITUTION:When working is performd for an H-steel 6 fixed on a table 4 by a stock vice, a gear box 8 equipped with a variable pole-quantity type induction motor 7 as power source is set at a work starting position, and fed in the direction of arrow 9. When a detection means detects that a cutter 12 for edge preparation part 2 reaches the edge preparation position, said gear box 8 is advanced at an edge preparation speed in substitution for the full-speed advance operation. When, a cutter 10 for scallop work 1 reaches the web part 14 of the H-steel 6, the gear box 8 is advanced at a scallop cutting speed, and when the cutter 10 passes through the web part 14, the gear box 8 is advanced again at the edge preparation speed. |
