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US 10,610,990 B2Granted
Machine tool and control method of machine tool
AssigneeToshiba Kikai Kabushiki Kaisha
InventorsAtsushi Tada, Takuma Miyamoto
Life of this patent
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Abstract
A control system of a machine tool includes a hydraulic pressure adjuster. The hydraulic pressure adjuster includes a sequence program controller that includes components for adding a function of adjusting a hydrostatic pressure of a static pressure oil supplied to a hydrostatic pressure guide mechanism, which are a pressure setting unit, a constant acceleration motion controller, a workpiece-weight calculator and a supply state adjuster.
Claims6
A machine tool comprising:
- a guide member;
- a movement member configured to move with respect to the guide member;
- a driving mechanism configured to move the movement member;
- a hydrostatic pressure guide mechanism provided between a guide surface of the guide member and a smooth surface of the movement member;
- and
- a control system configured to control a supply state of a static pressure oil supplied to the hydrostatic pressure guide mechanism, the control system comprising:
- a setting unit configured to set a supply pressure of the static pressure oil supplied to the hydrostatic pressure guide mechanism at a predetermined pressure;
- a constant acceleration motion unit configured to cause a constant acceleration motion of the movement member, on which a workpiece is placed, with respect to the guide member by the driving mechanism;
- a workpiece-weight estimation unit configured to estimate a weight of the workpiece from an operation state of the driving mechanism during the constant acceleration motion;
- and
- a supply state adjusting unit configured to adjust the supply state of the static pressure oil controlled by the control system depending on the weight of the workpiece estimated by the workpiece-weight estimation unit.
8 more elements
A control method of a machine tool, the machine tool comprising:
- a guide member;
- a movement member configured to move with respect to the guide member;
- a driving mechanism configured to move the movement member;
- a hydrostatic pressure guide mechanism provided between a guide surface of the guide member and a smooth surface of the movement member;
- and
- a control system configured to control a supply state of a static pressure oil supplied to the hydrostatic pressure guide mechanism, the method comprising:
- placing a workpiece on the movement member;
- setting a supply pressure of the static pressure oil supplied to the hydrostatic pressure guide mechanism at a predetermined pressure;
- causing a constant acceleration motion of the movement member, on which a workpiece is placed, with respect to the guide member by the driving mechanism;
- estimating a weight of the workpiece from an operation state of the driving mechanism during the constant acceleration motion;
- and
- adjusting the supply state of the static pressure oil controlled by the control system depending on the estimated weight of the workpiece.
9 more elements
Dependencies are inferred from the claim text.