# US 2012/0296449 A1 · Positioning Control Apparatus and Machine Tool Provided Therewith

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- Number: US 2012/0296449 A1
- Document ID: US20120296449A1
- Status: Published application
- Kind: A1
- Application number: 13/349,783
- Filed: 2012-01-13
- Published: 2012-11-22
- Earliest claimed: 2011-05-19
- Assignees: Mori Seiki Co., Ltd.
- Inventors: Akira Kimura; Koji Yamamoto; Katsuhiko Ono; Kimiyuki Nishimura; Kenichiro Ueno; Keiichi Nakamachi
- Web page: https://patentgrep.com/patent/US20120296449A1

## CPC

- G05B 19/404: characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia (G05B19/19, G05B19/41 take precedence)
- G05B 2219/41056: Compensation for changing stiffness, deformation of workpiece
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)

## Abstract

A positioning control apparatus has a moving body, a feed device having a guide mechanism for guiding the moving body in the direction of its feed axis and a drive mechanism for moving the moving body, a structural body supporting the feed device and a controller for controlling a moving position of the moving body with respect to a reference position on a machine tool by controlling the operation of the drive mechanism, and further has a calculating section calculating displacement of the feed device in the feed-axis direction with respect to the reference position caused by displacement of the structural body and a compensating section receiving the displacement data measured by the calculating section and adding modification data for eliminating the displacement to a control signal in the controller.

## Claims

### Claim 1

A positioning control apparatus comprising:
a moving body;
a feed device having a guide mechanism for guiding the moving body in a predetermined feed-axis direction and a drive mechanism for moving the moving body;
a structural body supporting the feed device; and
a controller for controlling a moving position of the moving body with respect to a predetermined reference position by controlling the operation of the drive mechanism;
wherein the positioning control apparatus has:
a calculating section which calculates displacement of the feed device in the feed-axis direction with respect to the reference position caused by displacement of the structural body, and
a compensating section which receives the displacement data calculated by the calculating section and adds modification data for eliminating the displacement of the feed device in the feed-axis direction with respect to the reference position to a control signal for controlling the drive mechanism in the controller.

### Claim 2 (depends on 1)

The positioning control apparatus of claim 1, wherein the calculating section directly or indirectly measures the displacement of the feed device in the feed-axis direction with respect to the reference position caused by displacement of the structural body, and outputs the measured displacement at predetermined time intervals.

### Claim 3 (depends on 1)

The positioning control apparatus according to claim 1, wherein the calculating section directly or indirectly measures at least one of a force applied to the moving body and acceleration of the moving body as well as acceleration of the structural body, calculates the displacement of the feed device in the feed-axis direction with respect to the reference position caused by displacement of the structural body on the basis of the equation of motion of the structural body, and outputs the calculated displacement at predetermined time intervals.

### Claim 4 (depends on 1)

A machine tool having the positioning control apparatus according to claim 1, wherein a tool or a workpiece is attached to the moving body.