| 摘要 |
PURPOSE:To enable increase of an open-loop gain and to prevent the occurrence of an error in positioning, by a method wherein, in a machine tool, the inertial reaction force of a moving body is burdened by a second drive device, and resilient displacement of a first drive device for positioning the moving body is decreased. CONSTITUTION:A first feed screw 3 is coupled to a moving body 5 through a nut, and a second feed screw 4 is coupled to a piston 6 of a hydraulic cylinder 6, secured to the moving body 5, through a nut. The second feed screw 4 applies a target set pressure Pmc, responding to a position deviation E, on the cylinder 6 through an external compensator 8, and burdens the inertia reaction force of the moving body 5. Acceleration of the moving body 5 is made equal to the conversion value in a moving direction of angular acceleration of a feed motor 2. Namely, the inertia reaction force of the moving body 5 exerted on the first feed screw 3 is reduced to zero, resilient deformation is decreased, and an apparent rigidity value is set to infinity. Since stability of a control system is increased, this constitution enables improvement of response through increase of a gain, and enables improvement of positioning precision during high response operation. |
