Auto-tool changer of machine tool and control method for auto-tool changer
AssigneeDn Solutions Co., Ltd.
InventorJooyoung JUNG
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to an automatic tool changer for a machine tool and a method of controlling the same, in which a tool change may be automatically performed without being stopped when one of tool pots moves even though a gear motor is used by changing the number of rotations of a dog part in multiple stages in accordance with the number of counted rotations of the dog part and the sequential number of change target tool pots in case that a tool change command is created.
Claims15
An automatic tool changer for a machine tool, the automatic tool changer comprising:
- a tool magazine having a plurality of tool pots and disposed rotatably;
- a drive part configured to generate rotational power for the tool magazine;
- a rotation part configured to rotate the tool magazine in conjunction with a rotation of the drive part;
- a dog part disposed on the rotation part and configured to rotate in conjunction with the rotation part;
- a sensing part disposed adjacent to the dog part and configured to detect the dog part;
- an inverter part configured to operate the drive part by applying an electric current to the drive part;
- and
- a control unit configured to control a tool change,
- wherein when a tool change command is created, the control unit identifies an exact position and the number of counted rotations of the dog part from the sensing part and performs a tool change by rotating the tool magazine while changing a rotational speed of the drive part in multiple stages by adjusting hertz to be applied to the drive part from the inverter part.
A method of controlling an automatic tool changer for a machine tool, in which a tool change is performed as tool pots of a tool magazine move one by one each time a rotation part rotates by one turn, the method comprising:
- storing data for allowing the rotation part to perform the tool change while identifying the number of rotations of a first dog part from a first sensing part, identifying an exact position of a second dog part from a second sensing part, and changing a rotational speed of a drive part in multiple stages by adjusting an electric current to be applied to a motor of the drive part from an inverter part when a tool change command is created;
- creating the tool change command for the tool change of the tool magazine;
- calculating the number of rotations one less than the sequential number of change target tool pots in response to the created tool change command;
- releasing a motor brake;
- rotating the drive part by operating the motor at a basic speed;
- counting the number of rotations by detecting, by the first sensing part, whether the first dog part rotates;
- decelerating the motor to a first stage deceleration speed and decelerating the rotation part to the first stage deceleration speed when a counting result indicates that the first dog part completely rotates by a number of turns one less than the sequential number of change target tool pots;
- activating the second sensing part to detect a rotation of the second dog part by the second sensing part;
- decelerating the motor to a second stage deceleration speed at the moment when a first sensing section of the first dog part enters the first sensing part while the first dog part performs a final rotation of the sequential number of change target tool pots at the first stage deceleration speed in accordance with the counting result;
- positioning a change target tool pot at an exact position by stopping the motor when the second sensing part detects a second sensing section of the second dog part;
- stopping the rotation of the tool magazine by operating direct current braking of the inverter part;
- and
- performing the tool change in response to the tool change command.
Dependencies are inferred from the claim text.