Machine tool and machining method
AssigneesCitizen Holdings Co., Ltd., Citizen Machinery Co., Ltd.
InventorHikaru Takahashi
Life of this patent
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Abstract
A machine tool includes a main spindle (10) which holds a workpiece (200, object to be machined) and is rotatable about the shaft center (C1), a main spindle motor (20, main spindle driver) which rotates the main spindle (10), a rotary guide bush (30, eccentric guide bush) which supports the workpiece (200) projecting from a leading end of the main spindle (10) to be rotatable in a state of being eccentric relative to the shaft center (C1) by a length E, a guide bush servomotor (40, guide bush driver) which rotates the rotary guide bush (30) about the shaft center (C1) in synchronization with the main spindle (10), and a controller (50) which controls the rotation and driving of the guide bush servomotor (40), so as to selectively switch between the rotation state and the stop state of the rotation.
Claims4
A machine tool comprising:
- a main spindle having a shaft center which fastens an object to be machined such that the shaft center is aligned with a center of the object to be machined, and rotates integrally with the object to be machined;
- an eccentric guide bush which supports the object to be machined projecting from a leading end of the main spindle in a state of being eccentric relative to the shaft center of the main spindle, wherein the eccentric guide bush is switched between a rotation state rotating about the shaft center of the main spindle and a stop state;
- a main spindle driver which rotates the main spindle about the shaft center;
- a guide bush driver which rotates the eccentric guide bush about the shaft center;
- and
- a controller configured to control the guide bush driver so as to switch the eccentric guide bush between the rotation state rotating about the shaft center in synchronization with the main spindle and the stop state.
Dependencies are inferred from the claim text.