METHOD OF CONTROLLING CUTTING OF FLYING SHEAR

摘要

PURPOSE: To cut a material to be cut into pieces having a set cut length with a high degree of accuracy with the use of a flying shear in which a shear cutter is started from a shear cutter stand-by position and is moved along a circular path by a shear drive motor so that a running material to be cut is cut by the shear cutter. ;CONSTITUTION: A contact between a shear cutter 11 and a steel bar W is detected in accordance with a variation in current value of a motor 13, and a wedge angle of the shear cutter into the steel bar W is obtained from the detection signal and a count value of output pulses from a pulse generator 15 in the motor 13. A distance over which the shear cutter is moved from a stand-by position HP to a position where it makes contact with the steel bar W at a right angle thereto, is calculated from thus obtained wedge angle. Further, the start timing of the shear cutter from the stand-by position HP in next cutting operation is obtained from the distance of the movement of the material to be cut and the set cut length.;COPYRIGHT: (C)1995,JPO