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US 10,442,050 B2Granted
Rotary table device and method of controlling the rotary table device
AssigneeFanuc Corporation
InventorZhizhen Xia
Life of this patent
Estimating the term…
Abstract
In a method of controlling a rotary table device, a clamp mechanism drive unit is controlled to unclamp a brake disk. Thereafter, a pressure of working fluid supplied to an unclamp fluid chamber is decreased, and a motor drive unit is controlled to rotate a motor. Then, the abrasion quantity of the piston and the clamp member is calculated based on a reference pressure and a pressure when the load torque of a spindle exceeded a reference load torque.
Claims14
A rotary table device including a clamp mechanism, the clamp mechanism comprising:
- a brake disk configured to rotate together with a spindle which rotates a workpiece;
- a piston configured to move in a clamping direction in which the brake disk is clamped and an unclamping direction in which the brake disk is unclamped;
- a clamp member configured to hold the brake disk between the clamp member and the piston which has moved in the clamping direction;
- and
- a biasing member configured to bias the piston by a restoration force of elastic deformation in the clamping direction,
- the rotary table device comprising:
- a clamp mechanism drive unit configured to supply working fluid to a clamp fluid chamber to move the piston in the clamping direction, in a case of clamping the brake disk, and supply the working fluid to an unclamp fluid chamber to move the piston in the unclamping direction and change a pressure of the supplied working fluid, in a case of unclamping the brake disk,
- a motor drive unit configured to drive the motor which rotates the spindle;
- a pressure detection unit configured to detect the pressure of the working fluid;
- a load detection unit configured to detect the load torque of the spindle;
- a drive control unit configured to control the clamp mechanism drive unit to unclamp the brake disk, and thereafter, decrease the pressure of the working fluid supplied to the unclamp fluid chamber and control the motor drive unit to rotate the motor;
- and
- an abrasion quantity calculation unit configured to calculate an abrasion quantity of the piston and the clamp member based on a reference pressure and the pressure of the working fluid when the load torque of the spindle exceeded the reference load torque.
10 more elements
A method of controlling a rotary table device including a clamp mechanism, the clamp mechanism comprising:
- a brake disk configured to rotate together with a spindle which rotates a workpiece;
- a piston configured to move in a clamping direction in which the brake disk is clamped and an unclamping direction in which the brake disk is unclamped;
- a clamp member configured to hold the brake disk between the clamp member and the piston which has moved in the clamping direction;
- and
- a biasing member configured to bias the piston by a restoration force of elastic deformation in the clamping direction,
- the rotary table device comprising:
- a clamp mechanism drive unit configured to supply working fluid to a clamp fluid chamber to move the piston in the clamping direction, in a case of clamping the brake disk, and supply the working fluid to an unclamp fluid chamber to move the piston in the unclamping direction and change a pressure of the supplied working fluid, in a case of unclamping the brake disk;
- and
- a motor drive unit configured to drive the motor which rotates the spindle;
- the method comprising the steps of:
- detecting the pressure of the working fluid;
- detecting the load torque of the spindle;
- controlling the clamp mechanism drive unit to unclamp the brake disk, and thereafter, decrease the pressure of the working fluid supplied to the unclamp fluid chamber and control the motor drive unit to rotate the motor;
- and
- calculating an abrasion quantity of the piston and the clamp member based on a reference pressure and the pressure of the working fluid when the load torque of the spindle exceeded the reference load torque.
12 more elements
Dependencies are inferred from the claim text.