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CN-122003307-A - Wire electric discharge machine and wire electric discharge machining method

CN122003307ACN 122003307 ACN122003307 ACN 122003307ACN-122003307-A

Abstract

A wire electric discharge machine for moving a wire electrode along a machining path and machining an object to be machined according to machining conditions includes a1 st wire guide and a2 nd wire guide for supporting the wire electrode, a sensor for detecting the wire electrode along a crossing direction crossing a feeding direction in which the wire electrode is fed, a calculation unit for calculating a displacement amount of a position of the wire electrode in the crossing direction based on a detection result of the sensor, and an adjustment unit for adjusting the machining conditions or the machining path based on the displacement amount.

Inventors

  • Zhou Jiubao Longxi

Assignees

  • 发那科株式会社

Dates

Publication Date
20260508
Application Date
20231013

Claims (9)

  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: a1 st wire guide for supporting the wire electrode below the object to be processed; A2 nd wire guide for supporting the wire electrode above the object to be processed; A sensor provided in at least one of the 1 st wire guide and the 2 nd wire guide, and configured to detect the wire electrode along a crossing direction crossing a feeding direction in which the wire electrode is fed; A calculation unit for calculating the displacement of the position of the wire electrode in the crossing direction based on the detection result of the sensor, and And an adjusting unit that adjusts the machining condition or the machining path based on the displacement amount.
  2. 2. The wire electric discharge machine according to claim 1, wherein, The calculation unit calculates, as the displacement amount, an offset amount of the position of the wire electrode with respect to a reference position Pr, the position 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 in a state in which the object is not processed.
  3. 3. The wire electric discharge machine according to claim 2, wherein, The adjustment unit adjusts the machining condition so that a target distance, which is preset as a distance between the wire electrode and the machined object, is reduced by the displacement amount when the wire electrode is closer to the machined object than the reference position, or adjusts the machining path so that the wire electrode is away from the machined object, and adjusts the machining condition so that the target distance is increased by the displacement amount or adjusts the machining path so that the wire electrode is closer to the machined object than the reference position.
  4. 4. The wire electric discharge machine according to any one of claims 1 to 3, 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 a 2 nd intersecting direction intersecting the feeding direction and orthogonal to the 1 st intersecting direction.
  5. 5. The wire electric discharge machine according to any one of claims 1 to 4, 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 calculation unit calculates the displacement amount based on the light receiving amount of the light received by the light receiving optical fiber.
  6. 6. 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 1 st wire guide supporting a wire electrode below a machining object, a 2 nd wire guide supporting the wire electrode above the machining object, and a sensor provided in at least one of the 1 st wire guide and the 2 nd wire guide and detecting the wire electrode along a crossing direction crossing a feeding direction of the wire electrode, wherein the wire electric discharge machine moves the wire electrode along a machining path relative to the machining object, and causes electric discharge between the machining object and the wire electrode according to machining conditions to machine the machining object, The wire electric discharge machining method includes: A calculation step of calculating a displacement amount of the position of the wire electrode in the crossing direction based on a detection result of the sensor, and And adjusting the processing conditions or the processing paths according to the displacement.
  7. 7. The wire electric discharge machining method according to claim 6, wherein, In the calculating step, the position of the wire electrode supported by the 1 st wire guide and the 2 nd wire guide at positions along the gravity direction in a state where the object is not processed is taken as a reference position, and an offset amount of the position of the wire electrode with respect to the reference position is calculated as the displacement amount.
  8. 8. The wire electric discharge machining method according to claim 7, wherein, In the adjusting step, when the wire electrode is closer to the object to be processed than the reference position, the target distance preset as the distance between the wire electrode and the object to be processed is reduced by the displacement amount by adjusting the processing condition, or the displacement amount is separated from the object to be processed by adjusting the processing path, and when the wire electrode is further away from the object to be processed than the reference position, the target distance is increased by the displacement amount by adjusting the processing condition, or the displacement amount is brought closer to the object to be processed by adjusting the processing path.
  9. 9. The wire electric discharge machining method according to any one of claims 6 to 8, 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 calculating step, the displacement amount is calculated based on the light receiving amount of the light received by the light receiving optical fiber.

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 In international publication No. 2014/068681, a wire electric discharge machining apparatus is disclosed that reduces machining profile errors by correcting positional displacement of a wire electrode. 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 a machining condition to machine the machining object, the wire electric discharge machine including a1 st wire guide that supports the wire electrode below the machining object, a2 nd wire guide that supports the wire electrode above the machining object, a sensor provided in at least one of the 1 st wire guide and the 2 nd wire guide and that detects the wire electrode in a crossing direction intersecting 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 in accordance with a detection result of the sensor, and an adjustment unit that adjusts the machining condition or the machining path in accordance with the displacement amount. A2 nd aspect of the present disclosure is a wire electric discharge machining method performed by a wire electric discharge machine including a1 st wire guide supporting a wire electrode below a machining object, a 2 nd wire guide supporting the wire electrode above the machining object, and a sensor provided in at least one of the 1 st wire guide and the 2 nd wire guide, the wire electrode being detected along a crossing direction crossing a feeding direction of the wire electrode, the wire electric discharge machine moving the wire electrode along a machining path with respect to the machining object and causing electric discharge between the machining object and the wire electrode in accordance with a machining condition to machine the machining object, the wire electric discharge machining method including a calculation step of calculating a displacement amount of a position of the wire electrode in the crossing direction in accordance with a detection result of the sensor, and an adjustment step of adjusting the machining condition or the machining path in accordance with the displacement amount. 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. 6 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 electrode is displaced by an electric discharge operation, a machining fluid pressure, or the like in electric discharge machining, and thus the actual machining shape may be different from the machining shape shown by the information of the machining path. Therefore, for example, in the case of repeating the finish machining for a plurality of cycles on the object to be machined, the machining amount in the machining performed before one cycle may become excessive or insufficient. However, such an actual machining shape is not considered in the subsequent electric discharge machining, and there is a possibility that the machining accuracy of the object to be machined may be lowered. Fig. 1 is a diagram showing a wire electric discharge machine 10 according to an embodiment. The X direction, Y direction, and Z direction shown in fig. 1 are orthogonal to each other, and the Z direction is a gravitational direction. But the positive direction of the Z direction is opposite to the positive direction of the gravitational force. The wire electric discharge machine 10 includes a main body 20, a control device 30, and a machining power source 40. The machining power source 40 applies a voltage across the electrodes between the wire ele