CHUCKING DEVICE AND CHUCKING METHOD FOR MACHINE TOOL

摘要

The present invention relates to a chucking device (10) and a chucking method for a machine tool (76) to grip a workpiece (12) to be machined by the machine tool (76). In this case, gripping units (28, 48) grip the workpiece (12) at a certain position (the position of the center (80) of an axis) by controlling a first cylinder (14) and a second cylinder (16) based on the position of a piston (18) of the first cylinder (14) and the position of a piston (38) of the second cylinder (16) detected by a length measuring sensor (34).