| 摘要 |
PROBLEM TO BE SOLVED: To inhibit a imeaningless motion of a back gauge and to appropriately drop off and carry out pieces to be cut by changing and adjusting a pull back amount of the back gauge corresponding to an evaluation value determined by a ratio of a cutting width dimension against a plate thickness dimension when a shearing processing is carried out after a plate material is positioned. SOLUTION: A servo motor 29 is driven and a back gauge 27 is moved in a forward and backward direction to adjust a position. An end surface of a plate material W is abutted to an abutting surface 27a of the back gauge 27 and the plate material W is positioned in a forward and backward direction against both upper and lower blades 7, 11. Thereafter, a hydraulic cylinder 13 is driven to descend a ram 9 and the plate material W is subjected to a shearing processing by both upper and lower blades 7, 11. At this time, in the case where an evaluation value determined by a ratio of a cutting width dimension against a plate thickness dimension is larger than a set value, a pull back amount of the back gauge 27 is made less. Whereas, in the case where the evaluation value is smaller than the set value, it is controlled such that the pull back amount is made larger.
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