Wire Electrical Discharge Machine, Correction Device, and Correction Method

Abstract

The present invention provides a wire electrical discharge machining apparatus (10), a correction apparatus (12), and a correction method for accurately correcting position information (60) indicating the positions of the fulcrums of an upper guide member (40) and a lower guide member (48) respectively. The correction apparatus (12) includes: a storage unit (66) that stores the position information (60); an inclination control unit (72) that inclines a wire electrode (14) at a prescribed angle (α); a measurement unit (76) that measures a relative movement amount from a state where the lower guide member (48) and a measurement site (28a) are separated by a prescribed distance in a relative movement direction until the wire electrode (14) inclined at the prescribed angle (α) reaches the measurement site (28a); and an information correction unit (80) that corrects the position information (60) in the storage unit (66) based on the prescribed angle (α) and the relative movement amount.

Description

Technical Field

[0001] The present invention relates to a wire electrical discharge machining machine, a correction device applied to the wire electrical discharge machining machine, and a correction method. Background Art

[0002] In the field of wire electrical discharge machining machines, a technique is known in which the wire electrode is inclined at a specified angle by making the relative positions of the upper guide member and the lower guide member different. An example thereof is disclosed in, for example, Japanese Patent Laid-Open No. 11-070415. Summary of the Invention

[0003] Japanese Patent Laid-Open No. 11-070415 uses the technique of inclining the wire electrode in a method for measuring the wear amounts of the upper and lower guide members, but the technique of inclining the wire electrode can also be applied to taper machining for imparting a tapered shape to a workpiece.

[0004] However, in taper machining, deviations in position information indicating the positions of the fulcrums of the upper and lower guide members respectively have a large influence on the shape of the workpiece after machining. Therefore, in order to perform taper machining with high precision, it is not sufficient to merely incline the electrode wire, and it is preferable to make the position information indicating the positions of the fulcrums of the upper and lower guide members respectively as accurate as possible.

[0005] Therefore, an object of the present invention is to provide a wire electrical discharge machining machine, a correction device, and a correction method for accurately correcting position information indicating the positions of the fulcrums of the upper guide member and the lower guide member respectively.

[0006] One aspect of the present invention is a correction device that corrects position information indicating the position of the upper fulcrum of the upper guide member and the position of the lower fulcrum of the lower guide member of a wire electrical discharge machining machine that supports a wire electrode. The wire electrical discharge machining machine includes a support table having a support surface that supports a measurement object having a measurement part, and is disposed between the upper guide member and the lower guide member in the vertical direction of the support surface. The correction device includes a storage unit that stores the position information, an inclination control unit that, in a state where the measurement part of the measurement object supported on the support surface and the wire electrode face each other in a relative movement direction orthogonal to the vertical direction, positions the upper guide member closer to the measurement part than the lower guide member in the relative movement direction, thereby inclining the wire electrode at a specified angle, a measurement unit that measures the relative movement amounts of the upper guide member, the lower guide member, and the wire electrode with respect to the measurement part from a state where the lower guide member and the measurement part are separated by a specified distance in the relative movement direction until the wire electrode inclined at the specified angle reaches the measurement part by relatively moving the upper guide member and the lower guide member along the relative movement direction, and an information correction unit that corrects the position information in the storage unit based on the specified angle and the relative movement amount.

[0007] Another aspect of the present invention is a wire electrical discharge machining machine including an upper guide member having an upper fulcrum that supports a wire electrode, a lower guide member having a lower fulcrum that supports the wire electrode together with the upper guide member, a support table having a support surface that supports a measurement object having a measurement part, and being disposed between the upper guide member and the lower guide member in the vertical direction of the support surface, a storage unit that stores position information indicating the position of the upper fulcrum and the position of the lower fulcrum, an inclination control unit that, in a state where the measurement part of the measurement object supported on the support surface and the wire electrode face each other in a relative movement direction orthogonal to the vertical direction, positions the upper guide member closer to the measurement part than the lower guide member in the relative movement direction, thereby inclining the wire electrode at a specified angle, a measurement unit that measures the relative movement amounts of the upper guide member, the lower guide member, and the wire electrode with respect to the measurement part from a state where the lower guide member and the measurement part are separated by a specified distance in the relative movement direction until the wire electrode inclined at the specified angle reaches the measurement part by relatively moving the upper guide member and the lower guide member along the relative movement direction, and an information correction unit that corrects the position information in the storage unit based on the specified angle and the relative movement amount.

[0008] Another aspect of the present invention is a correction method for correcting position information indicating the position of the upper fulcrum of the upper guide member and the position of the lower fulcrum of the lower guide member of a wire electrical discharge machining machine for supporting a wire electrode. The wire electrical discharge machining machine includes a support table having a support surface for supporting a measurement object having a measurement portion, and is disposed between the upper guide member and the lower guide member in the vertical direction of the support surface. The correction method includes: a storage step of storing the position information; an inclination control step of inclining the wire electrode at a predetermined angle by positioning the upper guide member closer to the measurement portion than the lower guide member in the relative movement direction while the measurement portion of the measurement object supported on the support surface and the wire electrode face each other in a relative movement direction orthogonal to the vertical direction; a measurement step of measuring the relative movement amounts of the upper guide member, the lower guide member, and the wire electrode with respect to the measurement portion from a state where the lower guide member and the measurement portion are separated by a predetermined distance in the relative movement direction until the wire electrode inclined at the predetermined angle reaches the measurement portion by relative movement of the upper guide member and the lower guide member along the relative movement direction; and an information correction step of correcting the position information stored in the storage step based on the predetermined angle and the relative movement amount.

[0009] According to the present invention, there are provided a wire electrical discharge machining machine, a correction device, and a correction method for accurately correcting position information indicating the positions of the fulcrums of the upper guide member and the lower guide member, respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is an overall structural diagram of a wire electrical discharge machining machine according to an embodiment.

[0011] Figure 2 is a connection structural diagram of a support table, a support table drive mechanism, and a control device.

[0012] In FIG. 3, Figure 3A is a schematic structural diagram of the upper guide member, Figure 3B is a schematic structural diagram of the lower guide member.

[0013] Figure 4 is a connection structural diagram of the upper guide member, the lower guide member, a wire guide member drive mechanism, and a control device.

[0014] Figure 5 is a schematic structural diagram of a correction device according to an embodiment.

[0015] Figure 6 is a flowchart illustrating the process of a correction method according to an embodiment.

[0016] In FIG. 7, Figure 7AIt is the first figure for explaining the tilt control step of the embodiment. Figure 7B It is the second figure for explaining the tilt control step of the embodiment.

[0017] Figure 8 It is the figure for explaining the estimation step of the embodiment.

[0018] Figure 9 It is the figure for explaining the information correction step of the embodiment.

[0019] Figure 10 It is the schematic structural diagram of the correction device of Modification 1.

[0020] Figure 11 It is the flowchart exemplifying the process of the correction method of Modification 1.

[0021] Figure 12 It is the figure for explaining the calculation step of Modification 1. Detailed implementation manners

[0022] Hereinafter, preferred embodiments will be listed to explain in detail the wire electrical discharge machining apparatus, the correction device, and the correction method according to the present invention.

[0023] [Embodiment]

[0024] Figure 1 It is the overall structural diagram of the wire electrical discharge machining apparatus 10 of the embodiment.

[0025] Before explaining the wire electrical discharge machining apparatus 10, the correction device 12, and the correction method of the present embodiment, the Figure 1 arrows in Figure 1 will be explained. In

[0026] the three directions respectively represented by the arrows X, Y, and Z are the axial directions of the wire electrical discharge machining apparatus 10 and are orthogonal to each other. Figure 1 Hereinafter, the wire electrical discharge machining apparatus 10 of

[0027] will be explained. The wire electrical discharge machining apparatus 10 is a machine tool that performs electrical discharge machining on a workpiece by generating an electric discharge between a wire electrode 14 and the workpiece.

[0028] The wire electrical discharge machining apparatus 10 includes a machining machine main body 16, a support table drive mechanism 17, a control device 18, and a wire guide drive mechanism 19. Among them, the machining machine main body 16 is a machine that performs electrical discharge machining by the wire electrode 14. The machining machine main body 16 of the present embodiment includes a machining tank 20, a support table 22, a supply system 24, and a recovery system 26.

[0029] The support table 22 is a base that is disposed in the machining groove 20 and immersed in the machining fluid, and has a support surface 22a with the XY directions as the planar directions and the Z direction as the vertical direction ( Figure 7A ). The support table 22 supports an object in the machining fluid through this support surface 22a.

[0030] The object supported on the support surface 22a of the support table 22 is a machining object during electrical discharge machining, but in this embodiment, it is a measurement object (fixture) 28 having a measurement part 28a protruding in the X direction or the Y direction on the support surface 22a ( Figure 7A ).

[0031] Figure 2 is a connection structure diagram of the support table 22, the support table drive mechanism 17, and the control device 18.

[0032] The support table 22 is connected to the support table drive mechanism 17. The support table drive mechanism 17 is a mechanism that can move the support table 22 in the machining groove 20 along each of the XYZ directions. In the structure of such a support table drive mechanism 17, for example, there is a servo motor X that moves the support table 22 along the X direction 22 , a servo motor Y that moves along the Y direction 22 , and a servo motor Z that moves along the Z direction 22 .

[0033] Among the multiple servo motors (servo motor X 22 , servo motor Y 22 , and servo motor Z 22 ) provided in the support table drive mechanism 17, encoders (not shown) are respectively provided. Thereby, signals indicating the rotation amounts of the servo motor X 22 , servo motor Y 22 , and servo motor Z 22 can be output to the control device 18 and the correction device 12.

[0034] The supply system 24 includes: a spool 30, a first motor 32, a brake roller 34, a second motor 36, a tension detection unit 38, and an upper guide 40. Among them, the spool 30 is a rotatable spool around which the unused wire electrode 14 is wound. The first motor 32 is a motor that applies torque to the spool 30.

[0035] In addition, the brake roller 34 is a rotatable roller that applies a braking force generated by friction to the wire electrode 14 stretched from the spool 30. The second motor 36 is a motor that applies a braking torque to the brake roller 34. And the tension detection unit 38 is a detector that detects the magnitude of the tension of the wire electrode 14.

[0036] The upper guide 40 is a wire guide that supports the wire electrode 14 that has passed through the braking roller 34 and guides it to the lower guide 48 described later. The upper guide 40 is disposed on the (upper) side of the support surface 22a with respect to the support table 22 in the vertical direction (Z direction) of the support surface 22a.

[0037] Figure 3A is a schematic structural diagram of the upper guide 40.

[0038] The upper guide 40 has a reference point 42 and an upper side fulcrum 44. Among them, the reference point 42 is a predetermined point that represents the reference position when indicating the position of the upper guide 40 in the Z direction. For example, it is known that the distance between the upper guide 40 and the support table 22 in the Z direction can be measured by a detector or the like, but the measured distance at this time is the distance between the reference point 42 and the support table 22. As an example, the reference point 42 of the present embodiment is located at the same position as the opening 46 provided at the lower end of the upper guide 40 in the Z direction.

[0039] The upper side fulcrum 44 is the fulcrum when the upper guide 40 supports the wire electrode 14. In addition, it is actually difficult to uniformly determine the position of the upper side fulcrum 44 in the Z direction in the upper guide 40. This difficulty is due to the individual differences of the upper guide 40 or the influence of the force received from the wire electrode 14 as the object to be supported, so the designed position is inconsistent with the actual position of the upper side fulcrum 44.

[0040] The recovery system 26 includes a lower guide 48, pinch rollers 50, feed rollers 52, a third motor 54, and a recovery box 56. Among them, the lower guide 48 is a wire guide that supports the wire electrode 14 passing through the upper guide 40 of the supply system 24 and guides it to the pinch rollers 50 and the feed rollers 52. The lower guide 48 is disposed on the opposite side (lower side) of the upper guide 40 across the support table 22 in the vertical direction (Z direction) of the support surface 22a.

[0041] Figure 3B is a schematic structural diagram of the lower guide 48.

[0042] The lower guide 48 has a lower side fulcrum 58. The lower side fulcrum 58 is the fulcrum when the lower guide 48 supports the wire electrode 14. In addition, regarding the lower side fulcrum 58, it is known that it is actually difficult to uniformly determine the position in the Z direction for the same reason as the upper side fulcrum 44.

[0043] The pinch rollers 50 and the feed rollers 52 are rollers that can grip and rotate the wire electrode 14 passing through the lower guide 48. The third motor 54 is a motor that applies torque to the feed rollers 52. The recovery box 56 is a box that recovers the wire electrode 14 that has passed through the pinch rollers 50 and the feed rollers 52.

[0044] The supply system 24 and the recovery system 26 are configured to sequentially convey the electrode wire 14 from the spool 30 to the brake roller 34, the upper guide 40, the lower guide 48, the feed roller 52, the pinch roller 50, and the recovery box 56.

[0045] Figure 4 It is a connection structure diagram of the upper guide 40, the lower guide 48, the wire guide drive mechanism 19, and the control device 18.

[0046] The upper guide 40 and the lower guide 48 are connected to the wire guide drive mechanism 19. The wire guide drive mechanism 19 is a mechanism capable of moving the upper guide 40 and the lower guide 48 in the machining groove 20 along the X direction (U direction parallel to the X direction), the Y direction (V direction parallel to the Y direction), and the Z direction, respectively. In the structure of such a wire guide drive mechanism 19, there are a servo motor X for moving the upper guide 40 along the XYZ directions 40 a servo motor Y 40 and a servo motor Z 40 . In addition, there are also a servo motor X for moving the lower guide 48 along the XYZ directions 48 a servo motor Y 48 and a servo motor Z 48 .

[0047] On each of the servo motor X 40 a servo motor Y 40 a servo motor Z 40 a servo motor X 48 a servo motor Y 48 and a servo motor Z 48 , encoders (not shown) are provided in the same way as the multiple servo motors of the support table drive mechanism 17. Thus, signals representing the respective rotation amounts of the servo motor X 40 a servo motor Y 40 a servo motor Z 40 a servo motor X 48 a servo motor Y 48 and a servo motor Z 48 can be output to the control device 18 and the correction device 12.

[0048] The above is an example of the structure of the processing machine main body 16. Next, the control device 18 and the correction device 12 of the present embodiment provided in the control device 18 will be described.

[0049] The control device 18 is, for example, a numerical control device and is a device for controlling the processing machine main body 16. The correction device 12 of the present embodiment is integrally provided on the control device 18.

[0050] Figure 5 This is a schematic structural diagram of the correction device 12 of the embodiment.

[0051] The correction device 12 is provided to correct the position information 60 indicating the positions of the fulcrums of the upper guide member 40 and the lower guide member 48 respectively, and includes a display unit 62, an operation unit 64, a storage unit 66, and an arithmetic unit 68.

[0052] Among them, the display unit 62 is a display device having a screen for displaying information. The screen of the display unit 62 is not limited, for example, it is a liquid crystal screen.

[0053] The operation unit 64 is provided for an operator to input information to the correction device 12, and is composed of, for example, a keyboard, a mouse, or a touch panel installed on the screen of the display unit 62.

[0054] The storage unit 66 stores information. The storage unit 66 is composed of hardware such as a RAM (Random Access Memory) and a ROM (Read Only Memory), for example. The storage unit 66 pre-stores the above-mentioned position information 60 and a prescribed correction program 70.

[0055] The position information 60 is the object of correction implemented by the correction device 12. Therefore, it is not necessary to require high precision of the information in the position information 60 at the time of pre-storing in the storage unit 66, and it is sufficient to prepare information with a certain degree of precision as in the past.

[0056] The correction program 70 is a program that prescribes a correction method for accurately correcting the position information 60. This correction method will be described in detail later.

[0057] The arithmetic unit 68 processes information through arithmetic operations. The arithmetic unit 68 is composed of hardware such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), for example.

[0058] In addition, the arithmetic unit 68 of the present embodiment includes an inclination control unit 72, a movement control unit 74, a measurement unit 76, an estimation unit 78, and an information correction unit 80. These units are implemented by the arithmetic unit 68 reading and executing the aforementioned correction program 70.

[0059] In a state where the wire electrode 14 faces the measurement site 28a on the support surface 22a in the relative movement direction, the upper guide member 40 is positioned closer to the measurement site 28a than the lower guide member 48 in the relative movement direction by the tilt control unit 72, thereby tilting the wire electrode 14 at a prescribed angle α. Further, in the present embodiment, the relative movement direction refers to the X direction or the Y direction, which is the direction in which the wire electrode 14 faces the measurement site 28a on the support table 22.

[0060] The tilt control unit 72 positions the upper guide member 40 closer to the measurement site 28a than the lower guide member 48 in the relative movement direction by controlling the aforementioned wire guide drive mechanism 19. At this time, relative movement between the upper guide member 40 and the lower guide member 48 is required, but the amount of this relative movement can be grasped based on signals output from encoders of a plurality of servo motors respectively provided in the wire guide drive mechanism 19.

[0061] The movement control unit 74 relatively moves the upper guide member 40 and the lower guide member 48 along the relative movement direction with respect to the support table 22 by controlling the aforementioned support table drive mechanism 17. After the tilt control unit 72 tilts the wire electrode 14, the movement control unit 74 relatively moves the wire electrode 14 while maintaining the tilt. Further, the movement control unit 74 may also move the upper guide member 40 and the lower guide member 48 along the relative movement direction by controlling the wire guide drive mechanism 19.

[0062] The measurement unit 76 measures the relative movement amounts of the upper guide member 40, the lower guide member 48, and the wire electrode 14 with respect to the measurement site 28a until the wire electrode 14 reaches the measurement site 28a. In particular, the measurement unit 76 in the present embodiment measures the relative movement amount from a state where the lower guide member 48 is separated from the measurement site 28a by a prescribed distance L ini in the relative movement direction until the wire electrode 14 tilted at the prescribed angle α reaches the measurement site 28a (see Figure 8 ).

[0063] The relative movement amount can be measured based on signals output from encoders of a plurality of servo motors respectively provided in the support table drive mechanism 17. Further, at the time of measurement, it is necessary to detect whether the wire electrode 14 has reached the measurement site 28a after starting the relative movement. This detection can be achieved, for example, by relatively moving while applying a prescribed voltage to the electrode 14 and reading the change in the voltage value.

[0064] Hereinafter, the prescribed distance L ini is also referred to as the initial separation distance L ini . Further, from the state where the lower guide member 48 is separated from the measurement site 28a by the initial separation distance L iniThe relative movement amount from the state until the wire electrode 14 inclined at a prescribed angle α reaches the measurement part 28a is also recorded as the arrival movement amount u.

[0065] Based on the estimated separation distance which is the estimated value of the separation distance in the Z direction between the lower fulcrum 58 and the measurement part 28a and the prescribed angle α, the estimation unit 78 obtains an estimated movement amount u'. The estimated movement amount u' is the estimated value of the relative movement amount until the inclined wire electrode 14 reaches the measurement part 28a. In addition, the estimated separation distance used for estimating the estimated movement amount u' is a value estimated by the operator in advance.

[0066] The information correction unit 80 corrects the position information 60 based on the inclination angle of the wire electrode 14 and the arrival movement amount u. Specifically, as will be described later, the information correction unit 80 of the present embodiment corrects the position information 60 based on the difference between the arrival movement amount u measured by the measurement unit 76 and the estimated movement amount u' estimated by the estimation unit 78 and the prescribed angle α.

[0067] The above is a structural example of the correction device 12 of the present embodiment. Next, a correction method of the wire electrical discharge machine 10 executed by the correction device 12 will be described.

[0068] Figure 6 is a flowchart illustrating the flow of the correction method of the embodiment.

[0069] The correction method includes a storage step (S1), an inclination control step (S2), a measurement step (S4), and an information correction step (S5). In addition, in the present embodiment, as Figure 6 shown, as a step performed before the information correction step, it further includes an estimation step (S3). Hereinafter, each of the steps will be described.

[0070] In addition, in the following description of the correction method, the above-mentioned relative movement direction is set as the X direction for description. The measurement part 28a of the measurement object (fixture) 28 is placed on the support surface 22a so as to protrude in the X direction.

[0071] The storage step is a step of storing the position information 60. The position information 60 is stored by the storage unit 66. As described above, the position information 60 is information to be corrected. Therefore, the accuracy of the information stored as the position information 60 at this time can be the same as before.

[0072] The inclination control step is a step of inclining the wire electrode 14 at a prescribed angle α by making the upper guide member 40 located closer to the measurement part 28a than the lower guide member 48 in the relative movement direction in a state where the measurement part 28a and the wire electrode 14 face each other in the X direction. This step is executed by the inclination control unit 72.

[0073] Figure 7A It is the first figure for explaining the tilt control step of the embodiment. Figure 7B It is the second figure for explaining the tilt control step of the embodiment. These figures schematically show the situation when observing the upper guide 40, the lower guide 48, the support table 22, and the jig 28 along the Y direction.

[0074] As Figure 7A shown, in a state where the jig 28 is supported by the support surface 22a of the support table 22 and the wire electrode 14 is opposed to the measurement part 28a of the jig 28 in the X direction, the tilt control step is performed.

[0075] If the wire electrode 14 is tilted at a prescribed angle α, it becomes Figure 7B the state of. In addition, the specific control when tilting the wire electrode 14 at the prescribed angle α is known in the technical field to which the wire electrical discharge machining machine 10 belongs, and thus will not be described in the present embodiment.

[0076] The estimation step is a step of obtaining the aforementioned estimated movement amount u'. This step is executed by the estimation unit 78.

[0077] Figure 8 It is a figure for explaining the estimation step.

[0078] Hereinafter, an example of the arithmetic processing performed by the estimation unit 78 in the estimation step will be described. After the estimation step starts, the estimation unit 78 first, as Figure 8 shown, defines a right triangle ABC with ∠ACB being a right angle. Among the three vertices A, vertex B, and vertex C of the right triangle ABC, vertex A is the lower fulcrum 58. In addition, vertex B is the intersection point of the virtual line extending in the X direction from the measurement part 28a and the tilted wire electrode 14. Moreover, vertex C is the intersection point of this virtual line and the vertically state wire electrode 14. The length of the side AC of the right triangle ABC is equal to the aforementioned estimated interval distance.

[0079] Here, the estimated separation distance can be an approximate value based on the position information 60 before correction in the present embodiment. In the present embodiment, the separation distance (distance between fulcrums) L 44，58 between the upper fulcrum 44 and the lower fulcrum 58 in the Z direction and the separation distance (height of the position of the upper guide 40) H 40 between the reference point 42 of the upper guide 40 and the support base 22 are set as the estimated separation distance. In addition, the method of measuring the distance between fulcrums L 44，58 and the height H of the position of the upper guide 40 40 is known, and thus will not be described in the present embodiment.

[0080] Next, the estimation unit 78 calculates the length of side BC based on the length of side AC (estimated interval distance) and a specified angle α. At this time, the length of side BC can be easily calculated based on the length of side AC and the tangent of right triangle ABC (BC = AC × tan α).

[0081] Then, the estimation unit 78 calculates the difference between the calculated length of side BC and the initial separation distance L ini as the estimated movement amount u' (u' = L ini - BC). The estimation unit 78 temporarily stores the calculated estimated movement amount u' in the storage unit 66. Thus, the estimation step ends.

[0082] The measurement step is a step of measuring the above-mentioned arrival movement amount u. This step is executed by the measurement unit 76.

[0083] In the measurement step, the measurement unit 76 first separates the lower guide member 48 from the measurement portion 28a by an initial separation distance L in the X direction ini . The control at this time can be achieved, for example, by previously storing the position of the lower guide member 48 with a separation distance of the initial separation distance L in the X direction relative to the measurement portion 28a in the storage unit 66. The position of this lower guide member 48 can be directly determined as the position that has retreated by the initial separation distance L, for example, after temporarily reaching the measurement portion 28a by relatively moving the wire electrode 14 without tilting. ini ini

[0084] After separating the lower guide member 48 from the measurement portion 28a by an initial separation distance L in the X direction ini , the measurement unit 76 measures the arrival movement amount u by relatively moving the wire electrode 14 inclined at a specified angle α along the X direction. The relative movement at this time can be achieved by requesting the movement control unit 74. The measurement unit 76 temporarily stores the measured arrival movement amount u in the storage unit 66. Thus, the measurement step ends.

[0085] The information correction step is a step of correcting the position information 60 stored in the storage step based on the specified angle α and the relative movement amount. This step is executed by the information correction unit 80.

[0086] Figure 9 is a diagram for explaining the information correction step. In addition, in Figure 9 , the upper support point 44, the lower support point 58, and the wire electrode 14 supported by them determined by the position information 60 of the storage unit 66 are shown by solid lines, and the actual upper support point 44, the lower support point 58, and the wire electrode 14 supported by them are shown by dashed lines. In addition, for the reference numerals of the actual upper support point 44, the lower support point 58, and the wire electrode 14 supported by them, ['] is added for distinction.

[0087] Next, an example of the arithmetic processing performed by the information correction unit 80 will be described. First, as Figure 9 shown, the information correction unit 80 defines a right triangle DB'B with ∠DBB' being a right angle. Among the three vertices B, vertex B', and vertex D of the right triangle DB'B, vertex B is the intersection point of the virtual line extending in the X direction from the measurement part 28a and the wire electrode 14. In addition, vertex B' is the intersection point of this virtual line and the wire electrode 14'. Moreover, vertex D is the intersection point of the virtual line extending in the Z direction from point B and the wire electrode 14'.

[0088] The length of the side BB' of the right triangle DB'B is equal to the difference between the estimated movement amount u' and the arrival movement amount u. Here, since the magnitude of ∠BDB' is a prescribed angle α, the length of the side BD can be easily obtained based on the length of the side BB' and the tangent of the right triangle DB'B (BD = BB' / tanα).

[0089] The length of the side BD thus obtained is equal to the difference in the positions of the lower fulcrum 58 (upper fulcrum 44) and the lower fulcrum 58' (upper fulcrum 44') in the Z direction. Therefore, if this difference is reflected in the position information 60 of the storage unit 66, the position information 60 is corrected to information with good accuracy.

[0090] In addition, observing Figure 9 it can be seen that when the arrival movement amount u is greater than the estimated movement amount u', it is necessary to correct the upper fulcrum 44 and the lower fulcrum 58 to a more upward position. On the other hand, assuming that the arrival movement amount u is smaller than the estimated movement amount u', it is necessary to correct the upper fulcrum 44 and the lower fulcrum 58 to a more downward position. The corrected position information 60 is stored (updated) in the storage unit 66. Thus, the information correction step is completed, and the correction method of the present embodiment ends.

[0091] As described above, according to the present embodiment, there are provided a wire electrical discharge machining machine 10, a correction device 12, and a correction method for accurately correcting the position information 60 representing the positions of the fulcrums of the upper guide member 40 and the lower guide member 48, respectively.

[0092] In addition, as long as the measurement step can be performed after the tilt control step, the estimation step can be performed before the tilt control step or after the measurement step.

[0093] [Modification Example]

[0094] As described above, an embodiment has been described as an example of the present invention. Various changes or improvements can be made to the embodiment. In addition, according to the description of the scope of patent protection, it is clear that the embodiments with such changes or improvements can also be included in the technical scope of the present invention.

[0095] (Modification Example 1)

[0096] Hereinafter, the correction device 12 of Modification Example 1 will be described. However, the same reference numerals are given to the elements already described in the embodiment, and the description thereof will be appropriately omitted.

[0097] Figure 10 It is a schematic structural diagram of the correction device 12 of Modification Example 1.

[0098] The correction device 12 of this modification has substantially the same structure as the correction device 12 of the embodiment, but is different at least in that the information correction unit 80 has a calculation unit 82 and a correction unit 84. Hereinafter, for convenience, the information correction unit 80 of this modification will be referred to as the information correction unit 80'.

[0099] In addition, when applying this modification, the storage unit 66 further stores the first height H in addition to the information described in the embodiment. 28a , the second height H 40 , and the distance L between the fulcrums 44、58 . Among them, the first height H 28a (see Figure 12 ) is the height of the measurement part 28a on the support surface 22a in the vertical direction with respect to the support surface 22a. In addition, the second height H 40 is the separation distance (the height of the position of the upper guide member 40) between the reference point 42 of the upper guide member 40 and the support table 22, which is also described in the embodiment.

[0100] Among the elements included in the information correction unit 80', the calculation unit 82 calculates the first distance L representing the distance between the lower fulcrum 58 and the measurement part 28a in the vertical direction based on the difference between the initial separation distance L ini and the arrival movement amount u and a specified angle α. 28a、58 (see Figure 12 ). At the same time, based on the first height H 28a , the second height H 40 , the distance L between the fulcrums 44、58 and the first distance L 28a、58 , the second distance L representing the distance between the reference point 42 and the upper fulcrum 44 in the vertical direction is calculated. 42、44 (see Figure 12 ).

[0101] Then, the correction unit 84 corrects the information indicating the position of the upper fulcrum 44 in the display position information 60 based on the second height H 40 and the second distance L 42，44 In addition, at the same time, based on the position of the corrected upper fulcrum 44 and the distance between the fulcrums L 44、58 the information indicating the position of the lower fulcrum 58 in the display position information 60 is corrected.

[0102] Figure 11 is a flowchart illustrating the process of the correction method of Modification Example 1.

[0103] Hereinafter, the correction method of this modification example will be described. As Figure 11 shown, the correction method of this modification example includes a storage step (S1'), an inclination control step (S2'), a measurement step (S3'), and an information correction step (S4'). The estimation step described in the embodiment is not required in this modification example.

[0104] In the above steps, in the storage step, in addition to the information stored in the storage step of the embodiment, the above-described first height H 28a , second height H 40 , and the distance between the fulcrums L 44、58 are also stored. In addition, the inclination control step and the measurement step are performed in the same manner as in the embodiment.

[0105] The information correction step has a calculation step (S5') and a correction step (S6). Among them, the calculation step is a step of calculating the first distance L 28a、58 and the second distance L 42、44 , and is a step executed by the calculation unit 82.

[0106] Figure 12 is a diagram for explaining the calculation step of Modification Example 1. In addition, Figure 12 the vertical direction in Figure 9 is the Z direction in the same manner as Figure 9 . In addition, the relative movement direction is also the X direction in the same manner as

[0107] Hereinafter, an example of the arithmetic processing in the calculation step will be described. As a premise, first, as Figure 12 shown, the calculation unit 82 defines a right triangle A'B'C with ∠A'CB' being a right angle. Among the three vertices A', B', and C of the right triangle A'B'C, the vertex B' is the intersection of the virtual straight line extending in the X direction from the measurement part 28a and the wire electrode 14. In addition, the vertex C is the intersection of this virtual straight line and the wire electrode 14 in the vertical state. And the vertex A' is the lower fulcrum 58.

[0108] The length of the side B'C of the right triangle A'B'C is equal to the initial separation distance Lini The difference from the measured arrival movement amount u in the measurement step. Additionally, the length of side A'C is equal to the above-described first distance L 28a，58 is equal. Here, since the magnitude of ∠B'A'C is a prescribed angle α, the length of side A'C can be easily obtained based on the length of side B'C and the tangent of right triangle A'B'C (A'C = B'C / tanα). The first distance L 28a、58 can be obtained in this way.

[0109] If the first distance L 28a、58 is obtained, then the first height H 28a , the second height H 40 , and the distance between the fulcrums L 44、58 are stored in the storage unit 66. Therefore, the calculation unit 82 can further obtain the above-described second distance L 42、44 based on these values. For example, by subtracting the first height H 28a，58 from the first distance L 28a to obtain the distance in the Z direction between the support surface 22a and the lower fulcrum 58, and subtracting the sum of this distance and the second height H 44，58 from the distance between the fulcrums L 40 , the second distance L 42，44 is obtained. The obtained second distance L 42，44 is temporarily stored in the storage unit 66. Thus, the calculation step is completed.

[0110] The correction step is a step of correcting the position information 60 based on the values calculated in the calculation step and the information stored in the storage unit 66, and is a step executed by the correction unit 84.

[0111] When the correction unit 84 corrects the position of the upper fulcrum 44 in the position information 60 in the correction step, as described above, it can be based on the second height H 40 and the second distance L 42，44 . Additionally, when the correction unit 84 corrects the position of the lower fulcrum 58 in the position information 60 in the correction step, it can be based on the information indicating the position of the corrected upper fulcrum 44 and the distance between the fulcrums L 44，58 . Thus, the position information 60 is corrected to information with good accuracy.

[0112] (Modification Example 2)

[0113] Regarding the correction device 12, in the embodiment, it has been described as being integrally formed with the control device 18 of the wire electrical discharge machining machine 10, but the structure of the correction device 12 is not limited thereto. That is, the correction device 12 may also be configured as a device different from the control device 18 and provided in the wire electrical discharge machining machine 10.

[0114] [The Invention Obtained from the Embodiment]

[0115] Hereinafter, the invention that can be grasped according to the above-described embodiments and modifications will be described.

[0116] <First Invention>

[0117] A correction device (12) that corrects position information (60) indicating the position of an upper fulcrum (44) of an upper guide member (40) and the position of a lower fulcrum (58) of a lower guide member (48) of a wire electrical discharge machining machine (10) that supports a wire electrode (14). The wire electrical discharge machining machine (10) includes: a support table (22) having a support surface (22a) that supports a measurement object (28) having a measurement part (28a), and is disposed between the upper guide member (40) and the lower guide member (48) in the vertical direction of the support surface (22a). The correction device (12) includes: a storage unit (66) that stores the position information (60); an inclination control unit (72) that, in a state where the measurement part (28a) of the measurement object (28) supported on the support surface (22a) and the wire electrode (14) face each other in a relative movement direction orthogonal to the vertical direction, positions the upper guide member (40) closer to the measurement part (28a) than the lower guide member (48) in the relative movement direction, thereby inclining the wire electrode (14) at a predetermined angle (α); a measurement unit (76) that measures the relative movement amount (u) of the upper guide member (40), the lower guide member (48), and the wire electrode (14) with respect to the measurement part (28a) from a state where the lower guide member (48) and the measurement part (28a) are separated by a predetermined distance (L ini ) until the wire electrode (14) inclined at the predetermined angle (α) reaches the measurement part (28a) by relatively moving the upper guide member (40) and the lower guide member (48) along the relative movement direction; and an information correction unit (80) that corrects the position information (60) in the storage unit (66) based on the predetermined angle (α) and the relative movement amount (u).

[0118] Thereby, a correction device (12) that accurately corrects the position information (60) indicating the positions of the fulcrums of the upper guide member (40) and the lower guide member (48) is provided.

[0119] Alternatively, the correction device (12) further includes: an estimation unit (78) that calculates an estimated movement amount (u') as an estimated value of the relative movement amount (u) based on an estimated separation distance, which is an estimated value of the separation distance in the vertical direction between the lower fulcrum (58) and the measurement part (28a), and the specified angle (α), and an information correction unit (80) that corrects the position information (60) based on the difference between the relative movement amount (u) and the estimated movement amount (u') and the specified angle (α). Thereby, a correction device (12) is provided that can accurately correct the position information (60) indicating the positions of the fulcrums of the upper guide member (40) and the lower guide member (48).

[0120] Alternatively, the upper guide member (40) has: a reference point (42) that serves as a reference when indicating the position of the upper guide member (40) in the vertical direction, and the storage unit (66) further stores: a first height (H 28a ), which represents the height of the measurement part (28a) in the vertical direction relative to the support surface (22a); a second height (H 40 ), which represents the height of the reference point (42) relative to the support surface (22a) in the vertical direction; a distance between fulcrums (L 44、58 ), which represents the distance in the vertical direction between the upper fulcrum (44) and the lower fulcrum (58), and the information correction unit (80) has: a calculation unit (82) that calculates a first distance (L ini ) representing the distance in the vertical direction between the lower fulcrum (58) and the measurement part (28a) based on the difference between the specified distance (L 28a、58 ) and the relative movement amount (u) and the specified angle (α), and calculates a second distance (L 28a ) representing the distance in the vertical direction between the reference point (42) and the upper fulcrum (44) based on the first height (H 40 ), the second height (H 44、58 ), the distance between fulcrums (L 28a、58 ) and the first distance (L 42、44 ); a correction unit (84) that corrects the information indicating the position of the upper fulcrum (44) in the position information (60) based on the second height (H 40 ) and the second distance (L 42、44 ), and corrects the position information (60) based on the corrected position of the upper fulcrum (44) and the distance between fulcrums (L 44、58)To correct the information indicating the position of the lower fulcrum (58) in the position information (60). Thereby, a correction device (12) is provided that can correct the position information (60) indicating the positions of the fulcrums of the upper guide member (40) and the lower guide member (48) with high precision.

[0121] <Second Invention>

[0122] A wire electrical discharge machining machine (10) includes: an upper guide member (40) having an upper fulcrum (44) that supports a wire electrode (14); a lower guide member (48) having a lower fulcrum (58) that supports the wire electrode (14) together with the upper guide member (40); a support table (22) having a support surface (22a) that supports a measurement object (28) having a measurement part (28a), and being disposed between the upper guide member (40) and the lower guide member (48) in the vertical direction of the support surface (22a); a storage unit (66) that stores position information (60) indicating the position of the upper fulcrum (44) and the position of the lower fulcrum (58); an inclination control unit (72) that, in a state where the measurement part (28a) of the measurement object (28) supported on the support surface (22a) and the wire electrode (14) face each other in a relative movement direction orthogonal to the vertical direction, positions the upper guide member (40) closer to the measurement part (28a) than the lower guide member (48) in the relative movement direction, thereby inclining the wire electrode (14) at a specified angle (α); a measurement unit (76) that measures the relative movement amount (u) of the upper guide member (40), the lower guide member (48), and the wire electrode (14) with respect to the measurement part (28a) from a state where the lower guide member (48) and the measurement part (28a) are separated by a specified distance (L ini ) until the wire electrode (14) inclined at the specified angle (α) reaches the measurement part (28a) by relatively moving the upper guide member (40) and the lower guide member (48) along the relative movement direction; and an information correction unit (80) that corrects the position information (60) of the storage unit (66) based on the specified angle (α) and the relative movement amount (u).

[0123] Alternatively, the wire discharge machining machine (10) further comprises: an estimating unit (78) for obtaining an estimated movement amount (u') as an estimated value of the relative movement amount (u) based on an estimated separation distance, which is an estimated value of the separation distance between the lower support point (58) and the measuring portion (28a) in the vertical direction, and the predetermined angle (α); and the information correction unit (80) for correcting the position information (60) based on a difference between the relative movement amount (u) and the estimated movement amount (u') and the predetermined angle (α). Thus, a wire discharge machining machine (10) is provided that can accurately correct the position information (60) indicating the position of each support point of the upper guide (40) and the lower guide (48).

[0124] Alternatively, the upper guide member (40) may include a reference point (42) which is a reference for indicating the position of the upper guide member (40) in the vertical direction, and the storage unit (66) may further store a first height (H 28a ), which indicates the height of the position of the measuring part (28a) in the vertical direction relative to the supporting surface (22a); a second height (H 40 ), which indicates the height of the reference point (42) in the vertical direction relative to the support surface (22a); the distance between the fulcrums (L 44、58 ), which represents the distance between the upper support point (44) and the lower support point (58) in the vertical direction, the information correction unit (80) comprises: a calculation unit (82), which calculates the distance based on the specified distance (L ini ) and the relative movement amount (u) and the predetermined angle (α) to calculate a first distance (L) representing the distance between the lower support point (58) and the measuring part (28a) in the vertical direction. 28a、58 ), and based on the first height (H 28a ), the second height (H 40 ), the distance between the fulcrums (L 44、58 ) and the first distance (L 28a、58 ), to calculate a second distance (L) representing the distance between the reference point (42) and the upper support point (44) in the vertical direction. 42、44 ); a correction unit (84), which is based on the second height (H 40 ) and the second distance (L 42、44 ) to correct the information indicating the position of the upper support point (44) in the position information (60), and based on the corrected position of the upper support point (44) and the inter-support point distance (L 44、58)To correct the information indicating the position of the lower fulcrum (58) in the position information (60). Thus, a wire electrical discharge machining apparatus (10) is provided that can correct with high precision the position information (60) indicating the positions of the fulcrums of the upper guide member (40) and the lower guide member (48) respectively.

[0125] <Third Invention>

[0126] A correction method for correcting position information (60) indicating the positions of the upper fulcrum (44) of the upper guide member (40) and the lower fulcrum (58) of the lower guide member (48) of a wire electrical discharge machining apparatus (10) that supports a wire electrode (14), wherein the wire electrical discharge machining apparatus (10) includes: a support table (22) having a support surface (22a) that supports a measurement object (28) having a measurement part (28a), and being disposed between the upper guide member (40) and the lower guide member (48) in the vertical direction of the support surface (22a), the correction method includes: a storage step of storing the position information (60); an inclination control step of, in a state where the measurement part (28a) of the measurement object (28) supported on the support surface (22a) and the wire electrode (14) face each other in a relative movement direction orthogonal to the vertical direction, making the upper guide member (40) be located closer to the measurement part (28a) than the lower guide member (48) in the relative movement direction, thereby inclining the wire electrode (14) at a specified angle (α); a measurement step of measuring the relative movement amounts (u) of the upper guide member (40), the lower guide member (48), and the wire electrode (14) with respect to the measurement part (28a) from a state where the lower guide member (48) and the measurement part (28a) are separated by a specified distance (L ini ) until the wire electrode (14) inclined at the specified angle (α) reaches the measurement part (28a) by relatively moving the upper guide member (40) and the lower guide member (48) along the relative movement direction; and an information correction step of correcting the position information (60) stored in the storage step based on the specified angle (α) and the relative movement amount (u).

[0127] Thus, a correction method is provided that can correct with high precision the position information (60) indicating the positions of the fulcrums of the upper guide member (40) and the lower guide member (48) respectively.

[0128] Alternatively, the correction method may further include: a presumption step of obtaining a presumed movement amount (u') as a presumed value of the relative movement amount (u) based on a presumed separation distance, which is a presumed value of the separation distance in the vertical direction between the lower fulcrum (58) and the measurement part (28a), and the specified angle (α), and in the information correction step, correcting the position information (60) based on the difference between the relative movement amount (u) and the presumed movement amount (u') and the specified angle (α). Thereby, a correction method is provided for accurately correcting the position information (60) representing the positions of the fulcrums of the upper guide member (40) and the lower guide member (48) respectively.

[0129] Alternatively, the upper guide member (40) has: a reference point (42), which is a reference when representing the position of the upper guide member (40) in the vertical direction. In the storage step, the following are further stored: a first height (H 28a ), which represents the height of the measurement part (28a) in the vertical direction relative to the support surface (22a); a second height (H 40 ), which represents the height of the reference point (42) relative to the support surface (22a) in the vertical direction; a distance between fulcrums (L 44、58 ), which represents the distance between the upper fulcrum (44) and the lower fulcrum (58) in the vertical direction. The information correction step includes: a calculation step of calculating a first distance (L ini ), which represents the distance between the lower fulcrum (58) and the measurement part (28a) in the vertical direction, based on the difference between the specified distance (L 28a、58 ) and the relative movement amount (u) and the specified angle (α), and calculating a second distance (L 28a ), which represents the distance between the reference point (42) and the upper fulcrum (44) in the vertical direction, based on the first height (H 40 ), the second height (H 44、58 ), the distance between fulcrums (L 28a、58 ) and the first distance (L 42、44 ); and a correction step of correcting the information representing the position of the upper fulcrum (44) in the position information (60) based on the second height (H 40 ) and the second distance (L 42、44 ), and correcting the position information (60) based on the corrected position of the upper fulcrum (44) and the distance between fulcrums (L 44、58)To correct the information indicating the position of the lower fulcrum (58) in the position information (60). Thereby, a correction method for accurately correcting the position information (60) indicating the positions of the fulcrums of the upper guide member (40) and the lower guide member (48) respectively is provided.

Claims

1. A correction device (12) that corrects position information (60) indicating the position of an upper fulcrum (44) of an upper guide member (40) and the position of a lower fulcrum (58) of a lower guide member (48) of a wire electrical discharge machining machine (10) that supports a wire electrode (14), characterized in that the wire electrical discharge machining machine includes: a support table (22) having a support surface (22a) that supports a measurement object (28) having a measurement part (28a), and being disposed between the upper guide member and the lower guide member in the vertical direction of the support surface; the correction device includes: a storage unit (66) that stores the position information; an inclination control unit (72) that, in a state where the measurement part of the measurement object supported on the support surface and the wire electrode face each other in a relative movement direction orthogonal to the vertical direction, positions the upper guide member closer to the measurement part than the lower guide member in the relative movement direction, thereby inclining the wire electrode at a prescribed angle (α); Measuring unit (76) that measures the relative movement amount (u) of the upper guide member, the lower guide member, and the wire electrode with respect to the measurement site from a state where the lower guide member and the measurement site are separated by a predetermined distance (L ini ) until the wire electrode that is inclined at the predetermined angle reaches the measurement site by relatively moving the upper guide member and the lower guide member along the relative movement direction; and an information correction unit (80) that corrects the position information in the storage unit based on the prescribed angle and the relative movement amount.

2. The correction device according to claim 1, characterized in that the correction device further includes an estimation unit (78) that obtains an estimated movement amount (u') as an estimated value of the relative movement amount based on an estimated separation distance, which is an estimated value of the separation distance in the vertical direction between the lower fulcrum and the measurement part, and the prescribed angle, and the information correction unit corrects the position information based on the difference between the relative movement amount and the estimated movement amount and the prescribed angle.

3. The correction device according to claim 1, characterized in that the upper guide member has a reference point (42) that is a reference when indicating the position of the upper guide member in the vertical direction, The storage unit also stores: a first height (H 28a ), which represents the height of the measurement part relative to the support surface in the vertical direction; a second height (H 40 ), which represents the height of the reference point relative to the support surface in the vertical direction; the distance between the fulcrums (L 44、58 ), which represents the distance between the upper fulcrum and the lower fulcrum in the vertical direction, the information correction unit includes: A calculation unit (82) that calculates a first distance (L 28a、58 ) representing the distance between the lower fulcrum and the measurement part in the vertical direction based on the difference between the specified distance and the relative movement amount and the specified angle, and calculates a second distance (L 42、44 ) representing the distance between the reference point and the upper fulcrum in the vertical direction based on the first height, the second height, the distance between the fulcrums, and the first distance; a correction unit (84) that corrects information indicating the position of the upper fulcrum in the position information based on the second height and the second distance, and corrects information indicating the position of the lower fulcrum in the position information based on the corrected position of the upper fulcrum and the distance between the fulcrums.

4. A wire electrical discharge machining machine (10), characterized in that, includes: an upper guide member (40) having an upper fulcrum (44) that supports a wire electrode (14); a lower guide member (48) having a lower fulcrum (58) that supports the wire electrode together with the upper guide member; a support table (22) having a support surface (22a) that supports a measurement object (28) having a measurement part (28a), and being disposed between the upper guide member and the lower guide member in the vertical direction of the support surface; a storage unit (66) that stores position information (60) indicating the position of the upper fulcrum and the position of the lower fulcrum; An inclination control unit (72) that inclines the wire electrode at a prescribed angle (α) by positioning the upper guide member closer to the measurement part in the relative movement direction than the lower guide member in a state where the measurement part of the measurement object supported on the support surface and the wire electrode face each other in a relative movement direction orthogonal to the vertical direction; Measuring unit (76) that measures the relative movement amount (u) of the upper guide, the lower guide, and the wire electrode with respect to the measurement part from a state where the lower guide and the measurement part are separated by a predetermined distance (L ini ) in the relative movement direction until the wire electrode that is inclined at the predetermined angle reaches the measurement part by relatively moving the upper guide and the lower guide along the relative movement direction; and an information correction unit (80) that corrects the position information in the storage unit based on the prescribed angle and the relative movement amount.

5. The wire electrical discharge machining apparatus according to claim 4, wherein the wire electrical discharge machining apparatus further includes an estimation unit (78) that obtains an estimated movement amount (u') as an estimated value of the relative movement amount based on an estimated separation distance, which is an estimated value of the separation distance in the vertical direction between the lower support point and the measurement part, and the prescribed angle, and the information correction unit corrects the position information based on the difference between the relative movement amount and the estimated movement amount and the prescribed angle.

6. The wire electrical discharge machining apparatus according to claim 4, wherein the upper guide member has a reference point (42) that is a reference when indicating the position of the upper guide member in the vertical direction, The storage unit also stores: a first height (H 28a ), which represents the height of the measurement part relative to the support surface in the vertical direction; a second height (H 40 ), which represents the height of the reference point relative to the support surface in the vertical direction; a distance between the fulcrums (L 44、58 ), which represents the distance between the upper fulcrum and the lower fulcrum in the vertical direction, and the information correction unit includes A calculation unit (82) that calculates a first distance (L 28a、58 ) representing the distance in the vertical direction between the lower fulcrum and the measurement part based on the difference between the specified distance and the relative movement amount and the specified angle, and calculates a second distance (L 42、44 ) representing the distance in the vertical direction between the reference point and the upper fulcrum based on the first height, the second height, the distance between the fulcrums, and the first distance; a correction unit (84) that corrects information indicating the position of the upper support point in the position information based on the second height and the second distance, and corrects information indicating the position of the lower support point in the position information based on the corrected position of the upper support point and the distance between the support points.

7. A correction method for correcting position information (60) indicating the position of an upper support point (44) of an upper guide member (40) and a lower support point (58) of a lower guide member (48) of a wire electrical discharge machining apparatus (10) that supports a wire electrode (14), characterized in that the wire electrical discharge machining apparatus includes a support table (22) that has a support surface (22a) for supporting a measurement object (28) having a measurement part (28a) and is disposed between the upper guide member and the lower guide member in the vertical direction of the support surface, and the correction method includes a storage step of storing the position information; an inclination control step of inclining the wire electrode at a prescribed angle (α) by positioning the upper guide member closer to the measurement part in the relative movement direction than the lower guide member in a state where the measurement part of the measurement object supported on the support surface and the wire electrode face each other in a relative movement direction orthogonal to the vertical direction; Measuring step of measuring the relative movement amount (u) of the upper guide member, the lower guide member, and the wire electrode with respect to the measurement site from a state where the lower guide member and the measurement site are separated by a predetermined distance (L ini ) in the relative movement direction until the wire electrode inclined at the predetermined angle reaches the measurement site by relatively moving the upper guide member and the lower guide member along the relative movement direction; and an information correction step of correcting the position information stored in the storage step based on the prescribed angle and the relative movement amount.

8. The correction method according to claim 7, wherein The correction method further includes: a presumption step of obtaining a presumed movement amount (u') as a presumed value of the relative movement amount based on a presumed separation distance which is a presumed value of a separation distance between the lower fulcrum and the measurement part in the vertical direction and the specified angle. In the information correction step, the position information is corrected based on a difference between the relative movement amount and the presumed movement amount and the specified angle.

9. The correction method according to claim 7, wherein the upper guide member has a reference point (42) which is a reference when indicating the position of the upper guide member in the vertical direction. In the storing step, the following are also stored: a first height (H 28a ), which represents the height of the measured part relative to the support surface in the vertical direction; a second height (H 40 ), which represents the height of the reference point relative to the support surface in the vertical direction; a distance between the fulcrums (L 44、58 ), which represents the distance between the upper fulcrum and the lower fulcrum in the vertical direction, The information correction step includes: Calculation step, based on the difference between the specified distance and the relative movement amount and the specified angle, to calculate a first distance (L 28a、58 ) representing the distance between the lower fulcrum and the measurement part in the vertical direction, and based on the first height, the second height, the distance between the fulcrums, and the first distance, to calculate a second distance (L 42、44 ) representing the distance between the reference point and the upper fulcrum in the vertical direction; and a correction step of correcting information indicating the position of the upper fulcrum in the position information based on the second height and the second distance, and correcting information indicating the position of the lower fulcrum in the position information based on the corrected position of the upper fulcrum and the distance between the fulcrums.

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