Support Point Position Calculation Method and Support Point Position Calculation Device

Abstract

This fulcrum position calculation method for calculating a fulcrum position of a wire electrode (18) of a wire electrical-discharge working machine (10) comprises: acquiring, from a storage unit (32), a table of fulcrum positions that correspond to each of a plurality of angles including a first angle, which is an angle of inclination of the wire electrode (18); tilting the wire electrode (18) by the first angle; measuring the fulcrum position corresponding to the first angle; calculating the correction value on the basis of the fulcrum position corresponding to the first angle in the table and the fulcrum position corresponding to the first angle that has been measured; and calculating fulcrum positions corresponding to respective angles on the basis of the correction value and the fulcrum positions corresponding to respective angles in the table.

Description

Technical Field

[0001] The present disclosure relates to a fulcrum position calculation method and a fulcrum position calculation device.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2006-035395 discloses a wire electrical discharge machining machine. The wire electrical discharge machining machine performs taper machining on a workpiece.

Summary of the Invention

[0003] When taper machining is performed, it is necessary to accurately obtain the fulcrum positions of the wire electrodes in two wire guides. Recently, a better fulcrum position calculation method and a fulcrum position calculation device have been eagerly awaited.

[0004] A first aspect of the present disclosure is a fulcrum position calculation method for calculating the fulcrum positions of wire electrodes in two wire guides of a wire electrical discharge machining machine, the fulcrum position calculation method including: a table acquisition step of acquiring a table from a storage unit that stores, as a table, the fulcrum positions corresponding to each of a plurality of angles including a first angle that is an angle of inclination of the wire electrode with respect to a reference line; a fulcrum position measurement step of inclining the wire electrode at the first angle with respect to the reference line and measuring the fulcrum position corresponding to the first angle; a correction value calculation step of calculating a correction value based on the fulcrum position corresponding to the first angle in the table and the fulcrum position corresponding to the measured first angle; and a fulcrum position calculation step of calculating the fulcrum positions corresponding to the respective angles based on the fulcrum positions corresponding to the respective angles in the table and the correction value.

[0005] A second aspect of the present disclosure is a fulcrum position calculation device that calculates the fulcrum positions of a wire electrode at two wire guides of a wire electrical discharge machining machine. The fulcrum position calculation device includes a table acquisition unit that acquires the table from a storage unit that stores, as a table, the fulcrum positions corresponding to each of a plurality of angles including a first angle that is the angle of inclination of the wire electrode with respect to a reference line; a fulcrum position measurement unit that inclines the wire electrode at the first angle with respect to the reference line and measures the fulcrum position corresponding to the first angle; a correction value calculation unit that calculates a correction value based on the fulcrum position corresponding to the first angle in the table and the fulcrum position corresponding to the measured first angle; and a fulcrum position calculation unit that calculates the fulcrum position corresponding to each angle based on the fulcrum position corresponding to each angle in the table and the correction value.

Brief Description of the Drawings

[0006]

Figure 1

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Embodiments for Carrying Out the Invention

[0007] In order to tilt the wire electrode at an accurate angle, it is necessary to accurately determine the distance between the fulcrums. The distance between the fulcrums is determined from the fulcrum positions of the wire electrode at each of the two wire guides. Since the fulcrum position changes according to the angle of inclination of the wire electrode, it is necessary to obtain the fulcrum positions corresponding to each of a plurality of angles by prior measurement.

[0008] When the wire guide is replaced or the like, the position of the wire guide may change. When the position of the wire guide changes, the fulcrum positions corresponding to the respective angles of inclination of the wire electrode also change. Therefore, conventionally, every time the wire guide is replaced or the like, the fulcrum positions corresponding to each of a plurality of angles are obtained by measurement. However, there is a problem that it takes a long time to obtain the fulcrum positions corresponding to each of a plurality of angles by measurement.

[0009] An object of the present disclosure is to shorten the time required to obtain the fulcrum positions corresponding to each of a plurality of angles.

[0010] 〔First Embodiment〕 [Configuration of Wire Electrical Discharge Machine] FIG. 1 is a schematic diagram of a wire electrical discharge machine 10. The wire electrical discharge machine 10 includes a machine body 12 and a control device 14.

[0011] The machine body 12 applies a voltage between the wire electrode 18 and the workpiece 16 to generate a discharge. Thereby, the workpiece 16 is subjected to electrical discharge machining.

[0012] The control device 14 controls the machine body 12. The control device 14 controls the table drive mechanism 20 to move the table 22. As a result, the wire electrode 18 moves relative to the workpiece 16 installed on the table 22 in the X-axis direction and the Y-axis direction.

[0013] The control device 14 controls the upper nozzle drive mechanism 24 to move the upper nozzle 26a. As a result, the upper nozzle 26a moves in the U-axis direction, V-axis direction, and Z-axis direction. The U-axis direction is a direction parallel to the X-axis direction. The V-axis direction is a direction parallel to the Y-axis direction. The Z-axis direction is a direction orthogonal to the U-axis direction and the V-axis direction.

[0014] The control device 14 includes an arithmetic unit 30 and a storage unit 32. The arithmetic unit 30 is a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), for example. The arithmetic unit 30 includes a fulcrum position measurement unit 34, a table acquisition unit 36, a fulcrum position calculation unit 38, and an angle control unit 40. The fulcrum position measurement unit 34, the table acquisition unit 36, the correction value calculation unit 37, the fulcrum position calculation unit 38, and the angle control unit 40 are realized by a program stored in the storage unit 32 being executed by the arithmetic unit 30. At least a part of the fulcrum position measurement unit 34, the table acquisition unit 36, the correction value calculation unit 37, the fulcrum position calculation unit 38, and the angle control unit 40 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). At least a part of the fulcrum position measurement unit 34, the table acquisition unit 36, the correction value calculation unit 37, the fulcrum position calculation unit 38, and the angle control unit 40 may be realized by an electronic circuit including discrete devices.

[0015] The memory unit 32 is composed of a volatile memory (not shown) and a non-volatile memory (not shown), which are computer-readable storage media. The volatile memory is, for example, a RAM (Random Access Memory) or the like. The non-volatile memory is, for example, a ROM (Read Only Memory), a flash memory, or the like. Data and the like are stored in the volatile memory, for example. Programs, tables, maps, and the like are stored in the non-volatile memory, for example. At least a part of the memory unit 32 may be provided in the above-described processor, integrated circuit, or the like. At least a part of the memory unit 32 may be mounted on a device connected to the wire electrical discharge machine 10 via a network.

[0016] The processing performed in the fulcrum position measurement unit 34, table acquisition unit 36, correction value calculation unit 37, fulcrum position calculation unit 38, and angle control unit 40 of the control device 14 will be described in detail later. The control device 14 corresponds to the fulcrum position calculation device of the present invention.

[0017] [Regarding the inclination of the wire electrode] FIG. 2 is a schematic diagram showing a state in which the wire electrode 18 is inclined. The upper nozzle 26a has an upper wire guide 42a that supports the wire electrode 18. The lower nozzle 26b has a lower wire guide 42b that supports the wire electrode 18. Hereinafter, when the upper wire guide 42a and the lower wire guide 42b are not distinguished, they may be referred to as the wire guide 42.

[0018] Hereinafter, the point where the upper wire guide 42a supports the wire electrode 18 may be described as the upper fulcrum P1. The point where the lower wire guide 42b supports the wire electrode 18 may be described as the lower fulcrum P2. When the upper fulcrum P1 and the lower fulcrum P2 are not distinguished, they may be described as the fulcrum P. Also, the Z-axis coordinate value of the upper fulcrum P1 may be described as the upper fulcrum position z1. The Z-axis coordinate value of the lower fulcrum P2 may be described as the lower fulcrum position z2.

[0019] When the workpiece 16 is tapered or has different shapes on the upper and lower sides, the processing machine main body 12 processes the workpiece 16 with the wire electrode 18 inclined with respect to the reference line 44. The reference line 44 is a line passing through the lower fulcrum P2 and parallel to the Z-axis direction. When the wire electrode 18 is not inclined with respect to the reference line 44, the wire electrode 18 is located on the reference line 44.

[0020] The upper fulcrum P1 moves in the U-axis direction or the V-axis direction together with the upper nozzle 26a. By moving the upper fulcrum P1 in the U-axis direction or the V-axis direction, the wire electrode 18 is inclined with respect to the reference line 44. The moving amount of the upper fulcrum P1 is set according to the inclination angle of the wire electrode 18 with respect to the reference line 44. Hereinafter, when referring to an angle, it indicates the inclination angle of the wire electrode 18 with respect to the reference line 44.

[0021] For example, in order to incline the wire electrode 18 to an angle α, the upper fulcrum P1 is moved in the U-axis direction from above the reference line 44. Let the moving distance be M. Let the distance in the Z-axis direction between the upper fulcrum P1 and the lower fulcrum P2 be the fulcrum distance H. The moving distance M is obtained by the following formula (1) based on the fulcrum distance H and the angle α.

[0022] (Equation 1) M = H × tan α … (1)

[0023] That is, if the fulcrum distance H is known, the moving distance M of the upper nozzle 26a required to incline the wire electrode 18 to the angle α can be obtained. This fulcrum distance H is obtained by the following formula (2) based on the upper fulcrum position z1 and the lower fulcrum position z2.

[0024] (Equation 2) H = z1 - z2 … (2)

[0025] The upper fulcrum position z1 and the lower fulcrum position z2 change according to the inclination angle of the wire electrode 18. That is, the fulcrum distance H changes according to the inclination angle of the wire electrode 18.

[0026] FIG. 3A is a schematic diagram for explaining the upper fulcrum point P1 that changes according to the inclination angle of the wire electrode 18. FIG. 3B is a schematic diagram for explaining the lower fulcrum point P2 that changes according to the inclination angle of the wire electrode 18. As shown in FIG. 3A, as the inclination angle of the wire electrode 18 increases, the upper fulcrum point P1 moves in the negative Z-axis direction. As shown in FIG. 3B, as the inclination angle of the wire electrode 18 increases, the lower fulcrum point P2 moves in the positive Z-axis direction.

[0027] FIG. 4 is a table showing examples of the upper fulcrum point position z1 and the lower fulcrum point position z2 corresponding to the inclination angle of the wire electrode 18. The upper fulcrum point position z1 in FIG. 4 indicates a value based on the Z-axis coordinate value of the reference point Q (FIG. 2) of the upper nozzle 26a. The Z-axis coordinate value of the lower fulcrum point position z2 in FIG. 4 indicates a value based on the origin (Z = 0).

[0028] By performing prior measurement to obtain the upper fulcrum point position z1 and the lower fulcrum point position z2 for each of a plurality of angles of the wire electrode 18, it is possible to accurately obtain the distance H between the fulcrum points corresponding to each angle.

[0029] [Regarding changes in the upper fulcrum point position and the lower fulcrum point position due to replacement of the wire guide, etc.] The user may remove and attach the wire guide 42 by replacing the wire guide 42 or the like.

[0030] When the wire guide 42 is replaced or the like, the position of the wire guide 42 in the Z-axis direction may change. When the position of the wire guide 42 in the Z-axis direction changes, the upper fulcrum point position z1 and the lower fulcrum point position z2 corresponding to each inclination angle of the wire electrode 18 also change. However, even when the upper fulcrum point position z1 and the lower fulcrum point position z2 corresponding to each inclination angle of the wire electrode 18 change, the relative positions of the upper fulcrum point position z1 and the lower fulcrum point position z2 corresponding to each angle are constant.

[0031] Therefore, even when the wire guide 42 is replaced or the like, if the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to one angle are obtained by measurement, it is possible to calculate the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to other angles.

[0032] FIG. 5 is a diagram for explaining how to obtain correction values. The table on the left side of FIG. 5 shows the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to an angle of 10° obtained by prior measurement. The table on the right side of FIG. 5 shows the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to an angle of 10° obtained by measurement after the wire guide 42 is replaced or the like.

[0033] As shown in FIG. 5, the difference between the upper fulcrum position z1 obtained by prior measurement and the upper fulcrum position z1 obtained by measurement after the wire guide 42 is replaced or the like is -0.2000. In this embodiment, this -0.2000 is used as the correction value for the upper fulcrum position z1.

[0034] As shown in FIG. 5, the difference between the lower fulcrum position z2 obtained by prior measurement and the lower fulcrum position z2 obtained by measurement after the wire guide 42 is replaced or the like is +0.1000. In this embodiment, this +0.1000 is used as the correction value for the lower fulcrum position z2.

[0035] FIG. 6 is a diagram for explaining a method of calculating the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle. The table on the left side of FIG. 6 shows the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle obtained by prior measurement. The table on the right side of FIG. 6 shows the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each calculated angle.

[0036] Using the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle obtained by prior measurement and the calculated correction values, the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle after the wire guide 42 is replaced or the like are calculated.

[0037] [Processing in the control device] As described above, the control device 14 includes a fulcrum position measurement unit 34, a table acquisition unit 36, a fulcrum position calculation unit 38, and an angle control unit 40.

[0038] FIG. 7 is a flowchart showing the fulcrum position calculation process executed in the control device 14.

[0039] Prior measurement of the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle is performed by the fulcrum position measurement unit 34 before the fulcrum position calculation process is executed.

[0040] The fulcrum position measurement unit 34 measures the upper fulcrum position z1 and the lower fulcrum position z2 in each case where the inclination of the wire electrode 18 is a plurality of angles including 10°. Since the measurement methods of the upper fulcrum position z1 and the lower fulcrum position z2 are known, the description thereof is omitted.

[0041] The process of pre-measuring the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle may be performed only once in the wire electrical discharge machining machine 10. Alternatively, the process of pre-measuring the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle may be performed for each type of the upper wire guide 42a and the lower wire guide 42b. The pre-measured upper fulcrum position z1 and lower fulcrum position z2 are associated with each angle and stored in the storage unit 32 as a table.

[0042] When the wire guide 42 is replaced or the like, the control device 14 performs the fulcrum position calculation process according to the flowchart shown in FIG. 7.

[0043] In step S1, the table acquisition unit 36 acquires a table from the storage unit 32. Then, the process proceeds to step S2.

[0044] In step S2, the fulcrum position measurement unit 34 measures the upper fulcrum position z1 and the lower fulcrum position z2 when the inclination of the wire electrode 18 is 10°. Then, the process proceeds to step S3.

[0045] In step S3, the correction value calculation unit 37 calculates a correction value. Then, the process proceeds to step S4. The differences between the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the angle of 10° of the table and the upper fulcrum position z1 and the lower fulcrum position z2 in the case of the angle of 10° measured in step S2 are calculated as the correction value.

[0046] In step S4, the fulcrum position calculation unit 38 calculates the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle. Then, the fulcrum position calculation process ends. The upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle are calculated based on the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle in the table and the correction value. The calculated upper fulcrum position z1 and lower fulcrum position z2 may be associated with each angle and stored in the storage unit 32.

[0047] The angle control unit 40 calculates the distance H between the fulcrums according to the above formula (2) based on the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the inclination angle α of the wire electrode 18 specified during machining. The angle control unit 40 calculates the movement distance M of the upper nozzle 26a according to the above formula (1) based on the specified angle α and the distance H between the fulcrums. The angle control unit 40 controls the upper nozzle drive mechanism 24 to move the upper nozzle 26a by the movement distance M from the reference line 44. Thereby, the inclination of the wire electrode 18 becomes the specified angle α.

[0048] In the above, the correction value calculation unit 37 calculates the correction value based on the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the inclination angle of 10° of the wire electrode 18. In contrast, the correction value calculation unit 37 may calculate the correction value based on the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to an angle other than the inclination angle of 10° of the wire electrode 18. In this case, in step S2 above, the fulcrum position measurement unit 34 needs to measure the upper fulcrum position z1 and the lower fulcrum position z2 with respect to the angle of the wire electrode 18 used in the calculation of the correction value.

[0049] [Function and Effect] In order to tilt the wire electrode 18 at an accurate angle, it is necessary to accurately determine the distance H between the fulcrums. The distance H between the fulcrums is determined from the upper fulcrum position z1 and the lower fulcrum position z2. Since the upper fulcrum position z1 and the lower fulcrum position z2 change according to the angle of inclination of the wire electrode 18, it is necessary to obtain the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each of a plurality of angles by prior measurement.

[0050] When the wire guide 42 is replaced or the like, the position of the wire guide 42 in the Z-axis direction may change. When the position of the wire guide 42 in the Z-axis direction changes, the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle of inclination of the wire electrode 18 also change. Therefore, conventionally, every time the wire guide 42 is replaced or the like, the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each of a plurality of angles are obtained by measurement. However, there is a problem that it takes a long time to obtain the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each of a plurality of angles by measurement.

[0051] The inventors of the present invention focused on the fact that even when the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle of inclination of the wire electrode 18 change, the relative positions of the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle are constant.

[0052] In this embodiment, a fulcrum position calculation method for calculating the upper fulcrum position z1 and the lower fulcrum position z2 of the wire electrical discharge machine 10 will be disclosed. In the fulcrum position calculation method, a table is acquired from the storage unit 32. The storage unit 32 stores, as a table, the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each of a plurality of angles including a first angle (for example, an angle of 10°) which is the angle of inclination of the wire electrode 18 with respect to the reference line 44. The wire electrode 18 is inclined to the first angle, and the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the first angle are measured. A correction value is calculated based on the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the first angle in the table and the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the measured first angle. The upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle are calculated based on the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle in the table and the correction value.

[0053] Also, in this embodiment, the control device 14 is disclosed as a fulcrum position calculation device for calculating the upper fulcrum position z1 and the lower fulcrum position z2 of the wire electrical discharge machine 10. In the control device 14, a table acquisition unit 36 acquires a table from the storage unit 32. The storage unit 32 stores, as a table, the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each of a plurality of angles including a first angle (for example, an angle of 10°) which is the angle of inclination of the wire electrode 18 with respect to the reference line 44. A fulcrum position measurement unit 34 inclines the wire electrode 18 to the first angle with respect to the reference line 44 and measures the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the first angle. A correction value calculation unit 37 calculates a correction value based on the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the first angle in the table and the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the measured first angle. A fulcrum position calculation unit 38 calculates the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle based on the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each angle in the table and the correction value.

[0054] Accordingly, when the wire guide 42 is replaced or the like, if the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to the first angle can be obtained by measurement, the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each of a plurality of angles can be calculated. As a result, after the wire guide 42 is replaced or the like, the time required to obtain the upper fulcrum position z1 and the lower fulcrum position z2 corresponding to each of a plurality of angles can be shortened.

[0055] Regarding the above embodiment, the following additional remarks are further disclosed.

[0056] (Supplementary Note 1) A fulcrum position calculation method for calculating the fulcrum positions of the wire electrode 18 in two wire guides 42 of a wire electrical discharge machining machine (10), the fulcrum position calculation method including: a table acquisition step of acquiring the table from a storage unit (32) that stores, as a table, the fulcrum positions corresponding to each of a plurality of angles including a first angle that is the angle of inclination of the wire electrode with respect to a reference line (44); a fulcrum position measurement step of inclining the wire electrode with respect to the reference line at the first angle and measuring the fulcrum position corresponding to the first angle; a correction value calculation step of calculating a correction value based on the fulcrum position corresponding to the first angle in the table and the fulcrum position corresponding to the measured first angle; and a fulcrum position calculation step of calculating the fulcrum positions corresponding to each of the angles based on the fulcrum positions corresponding to each of the angles in the table and the correction value. Thereby, the time required to obtain the fulcrum positions corresponding to each of a plurality of angles can be shortened.

[0057] (Appendix 2) In the fulcrum position calculation method described in Appendix 1, before the wire electrode is removed, the wire electrode is tilted to a plurality of angles including the first angle with respect to the reference line, the fulcrum positions corresponding to the respective angles are measured, and a storage step of storing the fulcrum positions corresponding to the measured respective angles in the storage unit as a table is included. The fulcrum position measurement step may be performed after the removal and attachment of the wire electrode. Thereby, the time required to obtain the fulcrum positions corresponding to the respective angles can be shortened.

[0058] (Appendix 3) A fulcrum position calculation device (14) for calculating the fulcrum positions of the wire electrode in two wire guides of a wire electrical discharge machining machine, the fulcrum position calculation device includes a table acquisition unit (36) that acquires the table from a storage unit that stores, as a table, the fulcrum positions corresponding to each of a plurality of angles including a first angle that is the angle of inclination of the wire electrode with respect to the reference line, a fulcrum position measurement unit (34) that tilts the wire electrode to the first angle with respect to the reference line and measures the fulcrum position corresponding to the first angle, a correction value calculation unit (37) that calculates a correction value based on the fulcrum position corresponding to the first angle in the table and the fulcrum position corresponding to the measured first angle, and a fulcrum position calculation unit (38) that calculates the fulcrum positions corresponding to the respective angles based on the fulcrum positions corresponding to the respective angles in the table and the correction value. Thereby, the time required to obtain the fulcrum positions corresponding to the respective angles can be shortened.

[0059] Although embodiments of the present disclosure have been described in detail, the present disclosure is not limited to the individual embodiments described above. These embodiments can be variously added, replaced, changed, partially deleted, etc., without departing from the gist of the invention, or without departing from the spirit and scope of the invention derived from the content described in the claims and its equivalents. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited thereto. The same applies when numerical values or mathematical formulas are used in the description of the above-described embodiments.

Explanation of Reference Numerals

[0060] 10…Wire electrical discharge machine 14…Support point position calculation device (control device) 18…Wire electrode 32…Storage unit 34…Support point position measurement unit 36…Table acquisition unit 37…Correction value calculation unit 38…Support point position calculation unit 42…Wire guide 44…Reference line

Claims

1. A fulcrum position calculation method for calculating the fulcrum positions of a wire electrode (18) in two wire guides (42) of a wire electrical discharge machining machine (10), comprising: a table acquisition step of acquiring the table from a storage unit (32) that stores, as a table, the fulcrum positions corresponding to each of a plurality of angles including a first angle that is the angle of inclination of the wire electrode with respect to a reference line (44); a fulcrum position measurement step of inclining the wire electrode at the first angle with respect to the reference line and measuring the fulcrum position corresponding to the first angle; a correction value calculation step of calculating a correction value based on the fulcrum position corresponding to the first angle in the table and the fulcrum position corresponding to the measured first angle; a fulcrum position calculation step of calculating the fulcrum positions corresponding to the respective angles based on the fulcrum positions corresponding to the respective angles in the table and the correction value; A fulcrum position calculation method having the above steps.

2. In the fulcrum position calculation method according to Claim 1, before the wire electrode is removed, the wire electrode is inclined at a plurality of angles including the first angle with respect to the reference line, the fulcrum positions corresponding to the respective angles are measured, and a storage step of storing, as a table, the fulcrum positions corresponding to the measured respective angles in the storage unit is provided, wherein the fulcrum position measurement step is performed after the removal and attachment of the wire electrode.

3. A fulcrum position calculation device (14) for calculating the fulcrum positions of a wire electrode in two wire guides of a wire electrical discharge machining machine, comprising: a table acquisition unit (36) that acquires the table from a storage unit that stores, as a table, the fulcrum positions corresponding to each of a plurality of angles including a first angle that is the angle of inclination of the wire electrode with respect to a reference line; a fulcrum position measurement unit (34) that inclines the wire electrode at the first angle with respect to the reference line and measures the fulcrum position corresponding to the first angle; a correction value calculation unit (37) that calculates a correction value based on the fulcrum position corresponding to the first angle in the table and the fulcrum position corresponding to the measured first angle; a fulcrum position calculation unit (38) that calculates the fulcrum positions corresponding to the respective angles based on the fulcrum positions corresponding to the respective angles in the table and the correction value; A fulcrum position calculation device having the above components.

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