Back to results
US 7,482,776 B2Granted
Controlling relative movement between a workpiece and a tool of a machine tool
AssigneeTRUMPF Werkzeugmaschinen GmbH + Co. KG
InventorWolfgang Scholich-Tessmann
Life of this patent
Estimating the term…
Abstract
Devices and related methods of controlling relative movement between a tool of a machine tool and a work piece including dividing a total desired relative tool to workpiece movement in a direction of an axis into a first movement component and a second movement component; controlling the first movement component with a first closed-loop axis control; determining a resulting movement quantity corresponding to the first movement component; feeding a position error from the first closed-loop axis control to the second closed-loop axis control controlling the second movement component in a closed-loop with the second closed-loop axis control, including adjusting for the position error of the first movement component.
Claims25
A method of controlling relative movement between a tool of a machine tool and a work piece, the method comprising:
- dividing a total desired relative tool to workpiece movement in a direction of an axis into a first movement component and a second movement component;
- controlling the first movement component with a first closed-loop axis control performed by a first position controller configured to control the first movement component;
- determining a first resulting movement quantity corresponding to the first movement component;
- feeding a position error from the first closed-loop axis control to a second closed-loop axis control, the position error comprising a difference between the total desired relative tool to workpiece movement and the first resulting movement quantity, wherein the feeding includes adapting the position error before the second closed-loop axis control, thereby generating an adapted quantity being proportional to the position error;
- controlling the second movement component with the second closed-loop axis control performed by a second position controller configured to control the second movement component, wherein controlling the second movement component includes adjusting for the position error of the first closed-loop axis control;
- determining a second resulting movement quantity corresponding to the second movement component;
- and
- determining a second input quantity for the second position controller by subtracting the second resulting movement quantity from the adapted quantity.
5 more elements
A method of controlling relative movement between a tool of a machine tool and a workpiece, the method comprising:
- dividing a total desired relative tool to workpiece movement in a direction of an axis into a first movement component and a second movement component;
- controlling the first movement component with a first closed-loop axis control performed by a position controller configured to control the first movement component;
- feeding a value from the first closed-loop axis control to a second closed-loop axis control;
- controlling the second movement component with the second closed-loop axis control, wherein controlling the second movement component includes performing a follow-up control of the second movement component using a follow-up controller configured to control the second movement component;
- determining an actual quantity comprising a resulting movement quantity corresponding to the total relative movement through the first and second movement components of a first movement cycle;
- and
- determining an input quantity for the position controller, the input quantity comprising the difference between the total desired relative tool to workpiece movement and the actual quantity.
4 more elements
A machine tool comprising:
- first and second axis drives each configured to move a tool or a work piece in respective movement components of a total desired relative tool to workpiece movement along a common axis direction;
- and
- an adjusting system configured to adjust the respective movement components by controlling the second axis drive according to a closed-loop control based on an adapted position error of the first axis drive, the adjusting system comprising:
- a determination device configured to
- multiply the position error of the first axis drive by a factor having a value between 0 and 1, thereby generating the adapted position error that is proportional to the position error, wherein the position error comprises the difference between the total desired relative tool to workpiece movement and a resulting movement quantity corresponding to the movement of the first axis drive, and
- determine an input quantity for the closed loop control from the adapted position error and a resulting movement quantity corresponding to the movement of the second axis drive;
- and
- a position controller configured to receive the input quantity from the determination device and control the second axis drive based at least in part on the input quantity from the determination device.
5 more elements
A machine tool comprising:
- first and second axis drives each configured to move a tool or a work piece in respective movement components of a total desired relative tool to workpiece movement along a common axis direction;
- a third axis drive configured to move the tool or the workpiece along a second axis direction;
- and
- an adjusting system configured to adjust the respective movement components by controlling the second axis drive according to a closed-loop control based on an adapted position error that is proportional to a position error, wherein the position error comprises the difference between the total desired relative tool to workpiece movement and a resulting movement quantity corresponding to the movement of the first axis drive, the adjusting system comprising:
- a determination device configured to determine an input quantity from the adapted position error and a resulting movement quantity corresponding to the movement of the second axis drive;
- and
- a position controller configured to receive the input quantity from the determination device and control the second axis drive based at least in part on the input quantity from the determination device,
- wherein the determination device comprises an adaptation device configured to generate the adapted position error by adapting the position error of the first axis drive, such that a combined steady state behavior of the first and second axis drives is substantially equal to a steady state behavior of the third axis drive.
5 more elements
Dependencies are inferred from the claim text.