Numerical controller

Patent metadata

Field	Value
Publication number	US-2016332245-A1
Application number	US-201615148364-A
Country	US
Kind code	A1
Filing date	May 6, 2016
Priority date	May 13, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

A numerical controller controlling a wire electric discharge machining device of the present invention is configured to perform perpendicular setting of the wire electrode with respect to the workpiece while the wire electrode is inserted into and passed through a machining hole of a workpiece and calculate the inclination of the workpiece; drive an XY axis and detect short-circuit; obtain the diameter of the machining start hole; subsequently drive the upper wire guide and the lower wire guide respectively and detect the short-circuit and calculate the location of the center of the upper portion of the machining start hole and the location of the center of the lower portion of the machining start hole; and, based on these calculated values, calculate the correction amount for the workpiece on the upper wire guide surface of the upper wire guide and the correction amount for the workpiece on the lower wire guide surface of the lower wire guide.

First claim

1 . A numerical controller providing machining for a workpiece by controlling a wire electric discharge machining device, the wire electric discharge machining device having an XY axis adapted to control the workpiece relatively with respect to a wire electrode in a horizontal direction and a UV axis adapted to control at least either one of an upper wire guide and a lower wire guide in the horizontal direction, the numerical controller comprising:
a perpendicular setting control unit configured to cause the wire electrode to be oriented perpendicular to the workpiece by controlling at least either one of the XY axis and the UV axis and causing the wire electrode to be oriented in parallel with a direction in which a machining start hole extends, the wire electrode being inserted into and extending through at least one machining start hole provided in and perpendicular to the workpiece; an inclination degree calculation unit configured to calculate an inclination of the workpiece with respect to the XY axis on the basis of a position of the UV axis in response to the wire electrode being made to be perpendicular to the workpiece by the perpendicular setting control unit; a machining start hole diameter calculation unit configured to calculate a diameter of the machining start hole by controlling the XY axis and detecting a short-circuit state between the wire electrode and an inner wall of the machining start hole; an upper-location-of-center calculation unit configured to obtain a location of a center of an upper portion of the machining start hole by controlling a relative position of the upper wire guide relative to the workpiece and detecting the short-circuit state between the wire electrode inserted into and extending through the machining start hole and the inner wall of the machining start hole; a lower-location-of-center calculation unit configured to obtain a location of a center of a lower portion of the machining start hole by controlling a relative position of the lower wire guide relative to the workpiece and detecting the short-circuit state between the wire electrode inserted into and extending through the machining start hole and the inner wall of the machining start hole; and a workpiece placement error correction amount calculation unit configured to calculate an amount of correction of the upper wire guide with respect to the workpiece on a surface of the upper wire guide and calculate an amount of correction of the lower wire guide with respect to the work piece on a surface of the lower wire guide on the basis of the inclination of the workpiece calculated by the inclination degree calculation unit, the diameter of the machining start hole calculated by the machining start hole diameter calculation unit, the location of the center of the upper portion of the machining start hole calculated by the upper-location-of-center calculation unit, and the location of the center of the lower portion of the machining start hole calculated by the lower-location-of-center calculation unit.

Assignees

• Fanuc Corp

Inventors

• Kurohara Yasuyuki

Classifications

• G05B19/404

  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) · CPC title

• B23H7/20

  for program control, e.g. adaptive · CPC title

• B23H2500/20

  Methods or devices for detecting wire or workpiece position · CPC title

• B23H7/06

  Control of the travel curve of the relative movement between electrode and workpiece · CPC title

• G05B2219/49177

  Runout, eccentricity, imbalance of tool or workpiece · CPC title