Machine tool

摘要

A machine tool including: a table disposed on a saddle movable along an X-axis; a pair of linear motors that moves the table along a Y-axis; position detectors that detect a first position and a second position of the table on the Y-axis; a pair of guide rails attached to the saddle; and four bearings engaged with the pair of guide rails, is provided. The machine tool includes a connecting unit connecting the table to the four bearings such that the table is rotatable relative to the four bearings, and a control unit that controls the pair of linear motors on the basis of the first and second positions.

主权项

1. A machine tool, comprising:
a saddle movable along a first axis; a table disposed on the saddle and movable along a second axis orthogonal to the first axis; a first linear motor installed at one side of the saddle along a direction of the first axis and moving the table along the second axis, wherein the first linear motor comprises a first mover and a first stator, the first mover is attached to a bottom surface of the table, and the first stator is attached to a top surface of the saddle, and a predetermined gap is formed between the first mover and the first stator; a second linear motor installed in parallel to the first linear motor with an interval therebetween at the other side of the saddle along the direction of the first axis and moving the table along the second axis, wherein the second linear motor comprises a second mover and a second stator, the second mover is attached to the bottom surface of the table, and the second stator is attached to the top surface of the saddle, and a predetermined gap is formed between the second mover and the second stator; a first position detector detecting a first position of the table in the second axis at the one side of the saddle along the direction of the first axis; a second position detector detecting a second position of the table in the second axis at the other side of the saddle along the direction of the first axis; a first guide rail installed at one side of the saddle along the direction of the first axis and extending in a direction of the second axis; a second guide rail installed at the other side of the saddle along the direction of the first axis and extending in the direction of the second axis; at least two first bearings engaged with the first guide rail; at least two second bearings engaged with the second guide rail; a connecting unit, wherein the table is fixed to the at least two first bearings and the at least two second bearings in the direction of the first axis through the connecting unit, so that the table is rotatable around a vertical axis relative to the direction of the first axis and the direction of the second axis, and wherein the table is rotatable relative to the saddle by having the connecting unit as a support; and a control unit controlling the first linear motor based on the first position and controlling the second linear motor based on the second position.