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CN-122028997-A - Wire electric discharge machine and wire electric discharge machining method

CN122028997ACN 122028997 ACN122028997 ACN 122028997ACN-122028997-A

Abstract

A wire electric discharge machine that moves a wire electrode along a machining path and machines a machining object according to machining conditions includes a sensor that detects the wire electrode along a crossing direction crossing a feeding direction in which the wire electrode is fed, a calculation unit that calculates a displacement amount of a position of the wire electrode in the crossing direction based on a detection result of the sensor, and a correspondence relation between the detection result and the displacement amount, and a calibration execution unit that corrects the correspondence relation stored in the storage unit based on the detection result when the wire electrode is tilted.

Inventors

  • Zhou Jiubao Longxi

Assignees

  • 发那科株式会社

Dates

Publication Date
20260512
Application Date
20231013

Claims (14)

  1. 1. A wire electric discharge machine for machining an object by moving a wire electrode along a machining path relative to the object and generating electric discharge between the object and the wire electrode according to machining conditions, The wire electric discharge machine is characterized by comprising: a pair of wire guides that support the wire electrode above and below the object to be processed; A sensor that detects the wire electrode along a crossing direction crossing a feeding direction in which the wire electrode is fed, at an arbitrary position between the 1 st wire guide, which is one of the pair of wire guides, and the 2 nd wire guide, which is the other wire guide; a storage unit that stores in advance a correspondence relation between a detection result of the sensor and a displacement amount of a position of the wire electrode in the intersecting direction; A calculation section that calculates the displacement amount based on the detection result and the correspondence relation stored in the storage section, and And a calibration execution unit that corrects the correspondence relationship stored in the storage unit, based on the detection result when the wire electrode is tilted by moving the 2 nd wire guide relative to the 1 st wire guide.
  2. 2. The wire electric discharge machine according to claim 1, wherein, The calibration executing section calculates the displacement amount based on a movement amount of the 2 nd wire guide when the wire electrode is tilted, a distance between the 1 st wire guide and the 2 nd wire guide, and a distance between the 1 st wire guide and the sensor, and corrects the correspondence stored in the storage section based on the detection result and the displacement amount when the wire electrode is tilted.
  3. 3. The wire electric discharge machine according to claim 2, wherein, The calibration executing section calculates the displacement amount every time the 2 nd wire guide is moved by a prescribed amount.
  4. 4. A wire electric discharge machine according to claim 2 or 3, wherein, The displacement amount is an amount of displacement of the position of the wire electrode with respect to a reference position when the positions of the wire electrode supported by the 1 st wire guide and the 2 nd wire guide positioned in a position along a gravitational direction are set as the reference positions in a state in which the object is not processed.
  5. 5. The wire electric discharge machine according to any one of claims 1 to 4, wherein, The sensor is disposed on the 1 st wire guide.
  6. 6. The wire electric discharge machine according to any one of claims 1 to 5, wherein, Two of the sensors are provided and, One of the two sensors detects the wire electrode along a 1 st intersecting direction intersecting the feeding direction, and the other sensor detects the wire electrode along a2 nd intersecting direction intersecting the feeding direction and orthogonal to the 1 st intersecting direction.
  7. 7. The wire electric discharge machine according to any one of claims 1 to 6, wherein, The machining apparatus further includes an adjusting unit that adjusts the machining condition or the machining path based on the displacement calculated by the calculating unit.
  8. 8. The wire electric discharge machine according to any one of claims 1 to 7, wherein, The sensor is a fiber optic sensor having a light projecting fiber that projects light from a light source and a light receiving fiber that receives the light projected by the light projecting fiber, The calibration executing section corrects the correspondence relation based on the detection result using the light receiving amount of the light received by the light receiving optical fiber when the wire electrode is inclined as the detection result.
  9. 9. A wire electric discharge machining method performed by a wire electric discharge machine, the wire electric discharge machining method characterized in that, The wire electric discharge machine includes a pair of wire guides that support a wire electrode above and below a workpiece, a sensor that detects the wire electrode at any position between a1 st wire guide, which is one of the pair of wire guides, and a 2 nd wire guide, which is the other wire guide, along a crossing direction crossing a feeding direction in which the wire electrode is fed, and a storage unit that stores in advance a correspondence relation between a detection result of the sensor and a displacement amount of a position of the wire electrode in the crossing direction, the wire electric discharge machine moves the wire electrode relative to the workpiece along a machining path, and causes electric discharge between the workpiece and the wire electrode in accordance with machining conditions, The wire electric discharge machining method includes: a calculation step of calculating the displacement amount based on the detection result and the correspondence relation stored in the storage section, and And a calibration execution step of correcting the correspondence relationship stored in the storage unit, based on the detection result when the wire electrode is tilted by moving the 2 nd wire guide relative to the 1 st wire guide.
  10. 10. The wire electric discharge machining method according to claim 9, wherein, In the calibration executing step, the displacement amount is calculated based on a movement amount of the 2 nd wire guide when the wire electrode is tilted, a distance between the 1 st wire guide and the 2 nd wire guide, and a distance between the 1 st wire guide and the sensor, and the correspondence stored in the storage unit is corrected based on the detection result and the displacement amount when the wire electrode is tilted.
  11. 11. The wire electric discharge machining method according to claim 10, wherein, In the calibration executing step, the displacement amount is calculated every time the 2 nd wire guide is moved by a prescribed amount.
  12. 12. The wire electric discharge machining method according to claim 11, wherein, The displacement amount is an amount of displacement of the position of the wire electrode with respect to a reference position when the positions of the wire electrode supported by the 1 st wire guide and the 2 nd wire guide positioned in a position along a gravitational direction are set as the reference positions in a state in which the object is not processed.
  13. 13. The wire electric discharge machining method according to any one of claims 9 to 12, characterized in that, And an adjustment step of adjusting the machining condition or the machining path according to the displacement calculated in the calculation step.
  14. 14. The wire electric discharge machining method according to any one of claims 9 to 13, characterized in that, The sensor is a fiber optic sensor having a light projecting fiber that projects light from a light source and a light receiving fiber that receives the light projected by the light projecting fiber, In the calibration execution step, the corresponding relation is corrected based on the detection result with the light receiving amount of the light received by the light receiving optical fiber when the wire electrode is inclined as the detection result.

Description

Wire electric discharge machine and wire electric discharge machining method Technical Field The present disclosure relates to a wire electric discharge machine and a wire electric discharge machining method. Background Japanese patent application laid-open No. 2014-133293 discloses a wire electric discharge machine in which the displacement of a wire electrode is corrected by correcting the position of a wire guide in accordance with a change in the hydraulic pressure of a machining liquid. The relation between the hydraulic pressure of the working fluid and the displacement amount of the wire guide is stored in the storage device in advance in the form of a mathematical expression. Disclosure of Invention It is desirable to suppress a decrease in machining accuracy caused by displacement of a wire electrode in electric discharge machining. A1 st aspect of the present disclosure is a wire electric discharge machine that moves a wire electrode along a machining path relative to a machining object and that causes electric discharge between the machining object and the wire electrode in accordance with machining conditions to machine the machining object, the wire electric discharge machine including a pair of wire guides that support the wire electrode above and below the machining object, a sensor that detects the wire electrode along a cross direction intersecting a wire feeding direction from one wire guide of the pair of wire guides, i.e., a 1 st wire guide, to the other wire guide, i.e., a2 nd wire guide, in accordance with a cross direction intersecting the wire feeding direction, a storage that stores in advance a correspondence relation between a detection result of the sensor and a displacement amount of a position of the wire electrode in the cross direction, a calculation unit that calculates the displacement amount in accordance with the detection result and the correspondence relation stored in the storage, and a calibration execution unit that stores the correction result when the wire guide 2 nd wire guide is tilted relative to the first wire guide. A2 nd aspect of the present invention is a wire electric discharge machining method performed by a wire electric discharge machine including a pair of wire guides supporting a wire electrode above and below a machining object, a sensor for generating electric discharge between the machining object and the wire electrode in accordance with machining conditions, the wire electric discharge machining method including a calculation step of detecting the wire electrode along a crossing direction crossing a wire feeding direction of the wire electrode from a 1 st wire guide, which is one of the pair of wire guides, to a2 nd wire guide, and a storage unit storing in advance a correspondence relation between a detection result of the sensor and a displacement amount of the wire electrode in the crossing direction, the wire electric discharge machining machine moving the wire electrode with respect to the machining object along a machining path, and performing machining of the machining object by generating electric discharge between the machining object and the wire electrode in accordance with machining conditions, the wire electric discharge machining method including a calculation step of calculating the correspondence relation between the detection result and the wire electrode in accordance with a wire guide stored in the storage unit, and a correction step of correcting the wire electrode by storing the correction result in accordance with the first wire guide and the correction result stored in the storage unit by the correction unit. Drawings Fig. 1 is a diagram showing a wire electric discharge machine according to an embodiment. Fig. 2 is an enlarged view of the sensor holding portion. Fig. 3 is a block diagram showing a part of the structure of the wire electric discharge machine. Fig. 4A, 4B, and 4C are diagrams for explaining detection results of the sensor corresponding to the displacement amount of the position of the wire electrode in processing. Fig. 5 is a diagram illustrating a process performed as adjustment of processing conditions. Fig. 6A is a diagram for explaining calibration. Fig. 6B is a diagram illustrating a correspondence relationship between a detection result of a sensor and a displacement amount. Fig. 7 is a flowchart showing an example of a processing procedure of the calibration method before wire electric discharge machining. Fig. 8 is a flowchart showing an example of a processing procedure of the wire electric discharge machining method. Detailed Description In a conventional wire electric discharge machine, machining conditions are changed during electric discharge machining based on information on a machining path determined by a machining program stored in advance. However, the actual machining shape may be different from the machining shape shown in the information of the machining path. For example, the wire elect