PATH DISPLAY APPARATUS CONSIDERING CORRECTION DATA

• US 20130169208A1
• Filed: 12/05/2012
• Published: 07/04/2013
• Est. Priority Date: 12/28/2011
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: TEZUKA, Junichi, OGAWA, Hajime
• Granted Patent: US 8,970,156 B2
• Time in Patent Office: Days
• US Class Current: 318/570
• CPC Class Codes: G05B 19/19 characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
• CPC Class Codes: G05B 2219/41032 Backlash
• CPC Class Codes: G05B 2219/41055 Kind of compensation such as pitch error compensation
• CPC Class Codes: Y10T 409/300896 with sensing of numerical information and regulation without mechanical connection between sensing means and regulated means [i.e., numerical control]
• CPC Class Codes: Y10T 483/17 including machine tool or component
• CPC Class Codes: Y10T 483/1702 Rotating work machine tool [e.g., screw machine, lathe, etc.]
• CPC Class Codes: Y10T 483/1729 Reciprocating tool machine tool [e.g., broaching machine, shaping machine, etc.]
• CPC Class Codes: Y10T 483/1733 Rotary spindle machine tool [e.g., milling machine, boring, machine, grinding machine, etc.]

Abstract

A path display apparatus includes a first position command acquiring unit that acquires first position command for motors, a first position feedback acquiring unit that acquires first position feedback of each of the motors, a correction data acquiring unit that acquires correction data generated for each of the motors, a second position command calculating unit that subtracts the correction data from the first position command to calculate a second position command, a second position feedback calculating unit that subtracts the correction data from the first position feedback to calculate second position feedback, a command path display unit that displays a command path of the tip point of the tool, based on the second position command; and a feedback path display unit that displays a feedback path of the tip point of the tool, based on the second position feedback.

Claims

1. A path display apparatus that displays a path of a tip point of a tool of a machine tool that controls the position and posture of the tool by a plurality of drive axes, the path display apparatus comprising:

a first position command acquiring unit that acquires first position command, generated by a numerical control apparatus, for a plurality of motors that drive the plurality of drive axes, respectively;

a first position feedback acquiring unit that acquires first position feedback of each of the plurality of motors, from a plurality of position detectors that detect the respective positions of the plurality of motors every predetermined control cycle;

a correction data acquiring unit that acquires correction data generated for each of the plurality of motors;

a second position command calculating unit that subtracts the correction data from the first position command to calculate a second position command;

a second position feedback calculating unit that subtracts the correction data from the first position feedback to calculate second position feedback;

a command path display unit that displays a command path of the tip point of the tool, based on the second position command calculated by the second position command calculating unit; and

a feedback path display unit that displays a feedback path of the tip point of the tool, based on the second position feedback calculated by the second position feedback calculating unit.

2. The path display apparatus as defined in claim 1, further comprising a second correction data calculating unit that calculates second correction data including control delay, using correction data acquired by the correction data acquiring unit and a transfer function indicating responses of respective position loops of the plurality of motors,

wherein the second position feedback calculating unit calculates second position feedback by subtracting the second correction data from the first position feedback.

3. The path display apparatus as defined in claim 2, wherein the second correction data calculating unit uses a first-order lag filter corresponding to a position gain, as the transfer function.

4. The path display apparatus as defined in claim 1, wherein the first position command is generated by adding the correction data to a position command read from an operation program of the machine tool.