Machine tool and control apparatus of the machine tool
AssigneesCitizen Watch Co., Ltd., Citizen Machinery Co., Ltd.
InventorsKazuhiko Sannomiya, Takaichi Nakaya
Life of this patent
Estimating the term…
Abstract
A machine tool and a control apparatus thereof include an amplitude control unit to control the amplitude of reciprocal vibration by a vibration unit. The amplitude control unit is configured to reduce the amplitude of the reciprocal vibration by the vibration unit as a cutting tool is fed in a feeding direction when the cutting tool reaches a predetermined cutting tool work stopping position on a workpiece in the feeding direction (Z-axis direction) to prevent the cutting tool from cutting the workpiece beyond the cutting tool work stopping position.
Claims7
A machine tool comprising:
- a workpiece holding unit to hold a workpiece;
- a tool rest to hold a cutting tool for cutting the workpiece;
- a feeding unit to feed the cutting tool toward the workpiece in a predetermined feeding direction via relative movement between the workpiece holding unit and the tool rest;
- a vibration unit to relatively vibrate the workpiece holding unit and the tool rest so that the cutting tool is fed in the feeding direction while reciprocally vibrating in the feeding direction;
- and
- a rotating unit to relatively rotate the workpiece and the cutting tool,
- the machine tool being capable of cutting the workpiece via the relative rotation between the workpiece and the cutting tool and via the feeding of the cutting tool toward the workpiece with the reciprocal vibration in the feeding direction,
- wherein the machine tool comprises an amplitude control unit to control an amplitude of the reciprocal vibration by the vibration unit, and
- the amplitude control mean is configured to reduce the amplitude of the reciprocal vibration by the vibration unit while the cutting tool is fed in the feeding direction when the cutting tool reaches a predetermined cutting tool work stopping position on the workpiece in the feeding direction.
3-6. (canceled)
A control apparatus provided in a machine tool comprising:
- a workpiece holding unit to hold a workpiece;
- a tool rest to hold a cutting tool for cutting the workpiece;
- a feeding unit to feed the cutting tool toward the workpiece in a predetermined feeding direction via relative movement between the workpiece holding unit and the tool rest;
- a vibration unit to relatively vibrate the workpiece holding unit and the tool rest so that the cutting tool is fed in the feeding direction while reciprocally vibrating in the feeding direction;
- and
- a rotating unit to relatively rotate the workpiece and the cutting tool,
- the machine tool being capable of cutting the workpiece via the relative rotation between the workpiece and the cutting tool and via the feeding of the cutting tool toward the workpiece with the reciprocal vibration in the feeding direction,
- wherein the control apparatus comprises an amplitude control unit to control an amplitude of the reciprocal vibration by the vibration unit, and
- the amplitude control mean is configured to reduce the amplitude of the reciprocal vibration by the vibration unit while the cutting tool is fed in the feeding direction when the cutting tool reaches a predetermined cutting tool work stopping position on the workpiece in the feeding direction.
Dependencies are inferred from the claim text.