Wire electric discharge machine having corner shape compensation function
AssigneeFanuc Corporation
InventorsYan NIU, Koji SUZUKI
Life of this patent
Estimating the term…
Abstract
In wire electric discharge machining performed with a wire electrode moved relative to a workpiece based on a desired shape, a command speed is controlled so that the discharge densities per unit distance in circular-arc and straight portions of the desired shape are equal, in consideration of the difference in arc length between a circular-arc portion in a desired shape and the corresponding portion of a machining path, whereby the shape accuracy of the circular-arc portion is improved.
Claims8
A wire electric discharge machine which performs machining by relatively moving a wire electrode and a workpiece based on a desired shape, the wire electric discharge machine comprising:
- a desired-shape creation unit configured to create a desired shape with reference to a drawing;
- a machining path creation unit configured to create a machining path based on a discharge gap and/or a wire diameter in addition to the created desired shape;
- a machining speed calculation unit configured to calculate a machining speed based on a detected value of a machining voltage and/or a discharge pulse;
- a circular-arc determination unit configured to determine a circular-arc portion in the desired shape;
- a circular-arc speed control unit configured to control a command speed on the machining path, for a circular-arc portion in the desired shape that is determined to be a circular-arc portion by the circular-arc determination unit, based on a difference between an arc length of the desired shape and arc length on the machining path corresponding to the desired shape;
- and
- a wire movement control unit configured to move the wire electrode relative to the workpiece along the machining path, based on the command speed controlled by the circular-arc speed control unit.
A wire electric discharge machine which performs machining by relatively moving a wire electrode and a workpiece based on a desired shape, the wire electric discharge machine comprising:
- a desired-shape creation unit configured to create a desired shape with reference to a drawing;
- a machining path creation unit configured to create a machining path based on a discharge gap and/or a wire diameter in addition to the created desired shape;
- a machining speed calculation unit configured to calculate a machining speed based on a detected value of a machining voltage and/or a discharge pulse;
- a circular-arc determination unit configured to determine a circular-arc portion in the machining path;
- a circular-arc speed control unit configured to control a command speed on the machining path, for a circular-arc portion in the machining path that is determined to be a circular-arc portion by the circular-arc determination unit, based on a difference between an arc length on the machining path and arc length of the desired shape corresponding to the machining path;
- and
- a wire movement control unit configured to move the wire electrode relative to the workpiece along the machining path, based on the command speed controlled by the circular-arc speed control unit.
Dependencies are inferred from the claim text.