| 摘要 |
PROBLEM TO BE SOLVED: To provide a fusion cutting system for a steel plate capable of quickly recovering from cutting off of arc discharge, without deterioration in a shape of a product.SOLUTION: When a torch 22 for performing arc discharge is moved on the basis of a fusion cutting route A for fusing and cutting a steel plate 5, and cutting off of the arc discharge from the torch 22 is detected by a monitoring function of a plasma generator, a control unit stores a position where the cutting off of the arc discharge occurs as a discharge cutting off point P2. Next, the control unit calculates one position in unnecessary parts 52 avoiding already fused and cut parts 501 and a part 502 to be fused and cut in the fusion cutting route A, as a resumption point P3 of the fusion cutting. After that, the control unit calculates a corrected route B passing from the resumption point P3, through the discharge cutting off point P2 and returning to the part 502 to be fused and cut, moves the torch 22 for performing arc discharge on the basis of the corrected route B, and makes the torch return to the fusion cutting route A. |
