Positioning device for three-dimensional hole machining and three-dimensional hole machining method based on three coordinates

Abstract

This application relates to a positioning device for three-dimensional hole machining and a three-dimensional hole machining method based on a three-coordinate system. The positioning device for three-dimensional hole machining includes a base, a support member, and a reference member. The base is used to be fixed on a workpiece. The reference member includes a reference ball and a reference rod. The reference rod is a straight rod. The reference ball is fixed at one end of the reference rod. A first threaded hole penetrating along a direction perpendicular to the length direction of the reference rod is formed at the other end of the reference rod. A second threaded hole is formed at one end of the support member. The reference rod is fixedly installed at one end of the support member through a bolt. The bolt is screwed and installed in the first threaded hole and the second threaded hole. The other end of the support member is fixed on the base. The bolt is arranged in a horizontal state. The positioning device for three-dimensional hole machining in this application can assist in measuring the three-dimensional coordinates of a marked position on a workpiece to be machined in a numerically controlled electro-discharge drilling machine. The measured three-dimensional coordinates have high precision and small errors, thereby improving the machining precision of the three-dimensional holes machined on the workpiece.

Description

Technical Field

[0001] The present application relates to the field of three-dimensional hole machining, and particularly to a positioning device for three-dimensional hole machining and a three-dimensional hole machining method based on a three-coordinate system. Background Art

[0002] During the production and machining process of automotive parts, it is sometimes necessary to machine three-dimensional holes on the automotive parts. In the prior art, when machining three-dimensional holes on a workpiece, a numerically controlled electric discharge drilling machine is usually used for discharge drilling. The numerically controlled electric discharge drilling machine includes a machine body, a workbench, a controller, a three-dimensional coordinate moving mechanism, a chuck, and an electrode. A three-dimensional space coordinate system is established on the machine body, and the controller has a three-dimensional coordinate servo control system for controlling the movement of the three-dimensional coordinate moving mechanism. Both the workbench and the three-dimensional coordinate moving mechanism are arranged on the machine body, the chuck is installed on the three-dimensional coordinate moving mechanism, and the electrode is installed on the chuck. In the prior art, when using the numerically controlled electric discharge drilling machine to machine three-dimensional holes on a workpiece, the following method is adopted: Step 1: First, mark the position on the workpiece to be drilled, then place the workpiece to be machined on the workbench, and then adjust the drilling direction of the electrode and the position of the workpiece to be machined so that the drilling direction of the electrode is consistent with the direction of the hole to be drilled on the workpiece to be machined, and then fixedly install the workpiece to be machined on the workbench; Step 2: Manually measure the three-dimensional coordinates of the marked position on the workpiece to be machined in the three-dimensional space coordinate system, and then control the three-dimensional coordinate moving mechanism to drive the chuck to drive the electrode to move in the three-dimensional space coordinate system through the three-dimensional coordinate servo control system of the controller. Finally, the electrode moves to the marked position corresponding to the workpiece to be machined, and then the electrode works for drilling.

[0003] The problem existing in the above workpiece three-dimensional hole machining method in the prior art is that the three-dimensional coordinate accuracy of the marked position on the workpiece to be machined measured in the three-dimensional space coordinate system is low and the error is large, resulting in low machining accuracy of the three-dimensional holes machined on the workpiece. Summary of the Invention

[0004] In order to improve the machining accuracy of the three-dimensional holes machined on a workpiece, the present application provides a positioning device for three-dimensional hole machining and a three-dimensional hole machining method based on a three-coordinate system.

[0005] In the first aspect, the positioning device for three-dimensional hole machining provided by the present application adopts the following technical solution:

[0006] Positioning device for three-dimensional hole machining, comprising a base, a support member and a reference member. The base is used to be fixed on a workpiece. The reference member includes a reference ball and a reference rod. The reference rod is a straight rod. The reference ball is fixed at one end of the reference rod. A first threaded hole penetrating along a direction perpendicular to the length direction of the reference rod is formed at the other end of the reference rod. A second threaded hole is formed at one end of the support member. The reference rod is fixedly installed at one end of the support member through a bolt. The bolt is screwed and installed in the first threaded hole and the second threaded hole. The other end of the support member is fixed on the base. The bolt is arranged in a horizontal state.

[0007] By adopting the above technical solution, when the positioning device for three-dimensional hole machining of the present application is in use, the positioning device is placed on the upper surface of the workpiece, and the positions where holes need to be drilled are marked on the workpiece surface. The angle of the reference rod is adjusted so that the length direction of the reference rod is consistent with the extension direction of the holes to be machined on the workpiece. Then, the base of the positioning device is fixed on the upper surface of the workpiece. The workpiece with the positioning device fixed is placed in a coordinate measuring machine. The placement state of the workpiece is adjusted so that the length direction of the reference rod is parallel to the XZ plane in the three-dimensional space coordinate system of the coordinate measuring machine. The three-dimensional coordinates (Xa, Ya, Za) of the center of the reference ball and the three-dimensional coordinates (Xb, Yb, Zb) of the marked position on the workpiece are measured by the coordinate measuring machine, and the three-dimensional coordinates (Xa - Xb, Ya - Yb, Za - Zb) of the marked position on the workpiece relative to the center of the reference ball are calculated. The measured workpiece is placed on the workbench of a numerically controlled electric discharge drilling machine. The angle of the electrode of the numerically controlled electric discharge drilling machine is calibrated so that the perforation direction of the electrode is parallel to the XZ plane in the three-dimensional space coordinate system of the numerically controlled electric discharge drilling machine. The placement state of the workpiece is adjusted so that the length direction of the reference rod is parallel to the XZ plane in the three-dimensional space coordinate system of the numerically controlled electric discharge drilling machine. The angle of the electrode is adjusted so that the perforation direction of the electrode is consistent with the length direction of the reference rod. Then, the workpiece is fixedly installed on the workbench. Manually move the center of the electric discharge outlet end face of the electrode to abut against the upper front end of the reference ball. At this time, the controller of the numerically controlled electric discharge drilling machine displays and records the three-dimensional coordinates (X1, Y1, Z1) of the current electrode; manually adjust the position of the electrode in the XZ plane so that the side of the electrode abuts against the upper end of the reference ball. At this time, the controller of the numerically controlled electric discharge drilling machine displays and records the three-dimensional coordinates (X2, Y2, Z2) of the current electrode; manually adjust the position of the electrode in the XZ plane so that the side of the electrode abuts against the lower end of the reference ball. At this time, the controller of the numerically controlled electric discharge drilling machine displays and records the three-dimensional coordinates (X3, Y3, Z3) of the current electrode. Calculate the three-dimensional coordinates of the center of the reference ball in the numerically controlled electric discharge drilling machine. The three-dimensional coordinates of the center of the reference ball are Calculate the three-dimensional coordinates of the marked position on the workpiece in the numerically controlled electric discharge drilling machine. The three-dimensional coordinates of the marked position are The electrode is controlled by a numerically controlled electric discharge drilling machine to move to the three-dimensional coordinates of the marked position on the workpiece, and then the electrode works to drill holes on the workpiece. The positioning device for three-dimensional hole machining in this application can assist in measuring the three-dimensional coordinates of the marked position on the workpiece to be machined in the numerically controlled electric discharge drilling machine. The measured three-dimensional coordinates have high accuracy and small error, thereby improving the machining accuracy of the three-dimensional holes machined on the workpiece.

[0008] Preferably, the reference rod is cylindrical, and the center line of the reference rod passes through the center of the reference sphere.

[0009] Preferably, a flat plate-shaped connecting portion is fixedly provided at one end of the reference rod for connecting with the support member. The center line of the reference rod is parallel to the plane where the connecting portion is located. One end of the support member for connecting with the reference rod is formed with a fitting surface adapted to fit with the connecting portion. The first threaded hole is located on the connecting portion, and the second threaded hole is located on the fitting surface.

[0010] By adopting the above technical solution, it is convenient to connect the reference rod and the support member with bolts.

[0011] Preferably, the support member is perpendicular to the base. A positioning plane is formed on one side of the support member opposite to the connecting portion, and the positioning plane is parallel to the plane where the connecting portion is located.

[0012] By adopting the above technical solution, the positioning plane can assist in adjusting the placement state of the workpiece, and it is convenient to adjust so that the length direction of the reference rod is parallel to the XZ plane in the three-dimensional space coordinate system. When the positioning plane is parallel to the XZ plane in the three-dimensional space coordinate system, the length direction of the reference rod is parallel to the XZ plane in the three-dimensional space coordinate system.

[0013] In the second aspect, the three-dimensional hole machining method based on three coordinates provided in this application adopts the following technical solution:

[0014] The three-dimensional hole machining method based on three coordinates includes the steps of S1. Place the positioning device on the upper surface of the workpiece. The positioning device is the above-mentioned positioning device for three-dimensional hole machining. Mark the position where the hole needs to be drilled on the workpiece surface. Adjust the angle of the reference rod so that the length direction of the reference rod is consistent with the extension direction of the hole to be machined on the workpiece, and then fix the base of the positioning device on the upper surface of the workpiece;

[0015] S2. Place the workpiece with the positioning device fixed in a three-coordinate measuring instrument. Adjust the placement state of the workpiece so that the length direction of the reference rod is parallel to the XZ plane in the three-dimensional space coordinate system of the three-coordinate measuring instrument. Measure the three-dimensional coordinates (Xa, Ya, Za) of the center of the reference sphere and the three-dimensional coordinates (Xb, Yb, Zb) of the marked position on the workpiece with the three-coordinate measuring instrument, and calculate the three-dimensional coordinates (Xa - Xb, Ya - Yb, Za - Zb) of the marked position on the workpiece relative to the center of the reference sphere;

[0016] S3. Place the measured workpiece on the workbench of the CNC electric discharge drilling machine, and calibrate the angle of the electrode of the CNC electric discharge drilling machine so that the perforation direction of the electrode is parallel to the XZ plane in the three-dimensional space coordinate system of the CNC electric discharge drilling machine. Adjust the placement state of the workpiece so that the length direction of the reference rod is parallel to the XZ plane in the three-dimensional space coordinate system of the CNC electric discharge drilling machine;

[0017] S4. Adjust the angle of the electrode so that the perforation direction of the electrode is consistent with the length direction of the reference rod;

[0018] S5. Fix and install the workpiece on the workbench;

[0019] S6. Manually move the center of the electric discharge outlet end face of the electrode to abut against the upper front end of the reference ball. At this time, the controller of the CNC electric discharge drilling machine displays and records the three-dimensional coordinates (X1, Y1, Z1) of the current electrode; Manually adjust the position of the electrode in the XZ plane so that the side of the electrode abuts against the upper end of the reference ball. At this time, the controller of the CNC electric discharge drilling machine displays and records the three-dimensional coordinates (X2, Y2, Z2) of the current electrode; Manually adjust the position of the electrode in the XZ plane so that the side of the electrode abuts against the lower end of the reference ball. At this time, the controller of the CNC electric discharge drilling machine displays and records the three-dimensional coordinates (X3, Y3, Z3) of the current electrode;

[0020] S7. Calculate the three-dimensional coordinates of the center of the reference ball in the CNC electric discharge drilling machine. The three-dimensional coordinates of the center of the reference ball are

[0021] S8. Calculate the three-dimensional coordinates of the marked position on the workpiece in the CNC electric discharge drilling machine. The three-dimensional coordinates of the marked position are

[0022] S9. Control the electrode to move to the three-dimensional coordinates of the marked position on the workpiece through the CNC electric discharge drilling machine, and the electrode works to perforate the workpiece.

[0023] By adopting the above technical solution, the three-dimensional hole processing method based on three coordinates of the present application can accurately measure the three-dimensional coordinates of the marked position on the workpiece to be processed in the CNC electric discharge drilling machine, thereby improving the processing accuracy of the three-dimensional holes processed on the workpiece.

[0024] Preferably, in S1, the base of the positioning device is fixed on the upper surface of the workpiece by an adhesive method.

[0025] By adopting the above technical solution, the base can be fixed on the upper surface of the workpiece, the upper surface of the workpiece will not be damaged, and the base can be conveniently removed from the workpiece.

[0026] Preferably, in step S3, a dial indicator is used to calibrate the angle of the electrode of the numerically controlled electric discharge drilling machine.

[0027] By adopting the above technical solution, the calibration accuracy is higher.

[0028] Preferably, in step S1, the positioning device is placed on the workpiece within 15 cm from the position where the hole needs to be drilled.

[0029] By adopting the above technical solution, placing the positioning device near the position where the hole needs to be drilled can facilitate the measurement of the three-dimensional coordinates of the position where the hole needs to be drilled on the workpiece relative to the center of the reference sphere. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram when the positioning device for three-dimensional hole machining in the embodiment of the present application is used in cooperation with a numerically controlled electric discharge drilling machine;

[0031] Figure 2 is Figure 1 an enlarged view of the structure at A in

[0032] Figure 3 is a schematic structural diagram of the positioning device for three-dimensional hole machining in the embodiment of the present application;

[0033] Figure 4 is a schematic diagram when the electrode abuts against the upper front end of the reference sphere;

[0034] Figure 5 is a schematic diagram when the electrode abuts against the upper end of the reference sphere;

[0035] Figure 6 is a schematic diagram when the electrode abuts against the lower end of the reference sphere.

[0036] Description of the reference numerals: 1. Base; 2. Support member; 21. Fitting surface; 22. Positioning plane; 3. Reference member; 31. Reference sphere; 32. Reference rod; 33. Connecting portion; 4. Bolt; 5. Workpiece; 51. Marked position; 6. Numerically controlled electric discharge drilling machine; 61. Electrode; 62. Workbench. Detailed Description of the Embodiment

[0037] The following further describes the present application in detail with reference to the drawings.

[0038] Referring to Figure 1 and Figure 2 , the embodiment of the present application discloses a positioning device for three-dimensional hole machining, including a base 1, a support member 2 and a reference member 3. The base 1 is used to be fixed on the workpiece 5. The reference member 3 includes a reference sphere 31 and a reference rod 32. The reference rod 32 is a straight rod, and the reference sphere 31 is fixed at one end of the reference rod 32. In this embodiment, the reference rod 32 has a cylindrical structure, and the center line of the reference rod 32 passes through the center of the reference sphere 31. Referring again toFigure 3 , a first threaded hole penetrating in a direction perpendicular to the length direction of the reference rod 32 is formed at the other end of the reference rod 32, a second threaded hole is formed at one end of the support member 2, and the reference rod 32 is fixedly installed at one end of the support member 2 through a bolt 4, and the bolt 4 is screwed into the first threaded hole and the second threaded hole. In this embodiment, a flat plate-shaped connecting portion 33 is fixedly provided at one end of the reference rod 32 for connecting with the support member 2, the central axis of the reference rod 32 is parallel to the plane where the connecting portion 33 is located, a fitting surface 21 adapted to fit with the connecting portion 33 is formed at one end of the support member 2 for connecting with the reference rod 32, the first threaded hole is located on the connecting portion 33, and the second threaded hole is located on the fitting surface 21. The other end of the support member 2 is fixed on the base 1, the bolt 4 is arranged horizontally, the support member 2 is perpendicular to the base 1, and a positioning plane 22 is formed on one side of the support member 2 facing away from the connecting portion 33, and the positioning plane 22 is parallel to the plane where the connecting portion 33 is located.

[0039] The implementation principle of the positioning device for three-dimensional hole machining in the embodiment of the present application is as follows: When the positioning device for three-dimensional hole machining in the present application is in use, the positioning device is placed on the upper surface of the workpiece 5, the position where the hole needs to be drilled is marked on the surface of the workpiece 5, and the angle of the reference rod 32 is adjusted so that the length direction of the reference rod 32 is consistent with the extension direction of the hole to be machined on the workpiece 5. Then, the base 1 of the positioning device is fixed on the upper surface of the workpiece 5, and the workpiece 5 with the positioning device fixed is placed in a coordinate measuring machine. The placement state of the workpiece 5 is adjusted so that the length direction of the reference rod 32 is parallel to the XZ plane in the three-dimensional space coordinate system of the coordinate measuring machine. The three-dimensional coordinates (Xa, Ya, Za) of the center of the reference sphere 31 and the three-dimensional coordinates (Xb, Yb, Zb) of the marked position 51 on the workpiece 5 are measured by the coordinate measuring machine, and the three-dimensional coordinates (Xa - Xb, Ya - Yb, Za - Zb) of the marked position 51 on the workpiece 5 relative to the center of the reference sphere 31 are calculated. The measured workpiece 5 is placed on the workbench 62 of the numerically controlled electric discharge drilling machine 6, and the angle of the electrode 61 of the numerically controlled electric discharge drilling machine 6 is calibrated so that the perforation direction of the electrode 61 is parallel to the XZ plane in the three-dimensional space coordinate system of the numerically controlled electric discharge drilling machine 6. The placement state of the workpiece 5 is adjusted so that the length direction of the reference rod 32 is parallel to the XZ plane in the three-dimensional space coordinate system of the numerically controlled electric discharge drilling machine 6, the angle of the electrode 61 is adjusted so that the perforation direction of the electrode 61 is consistent with the length direction of the reference rod 32, and then the workpiece 5 is fixedly installed on the workbench 62. Refer to Figure 4 , manually move the center of the spark outlet end face of the electrode 61 to abut against the upper front end of the reference sphere 31, and at this time, the controller of the numerically controlled electric discharge drilling machine 6 displays and records the three-dimensional coordinates (X1, Y1, Z1) of the current electrode 61. Refer to Figure 5, manually adjust the position of the electrode 61 within the XZ plane so that the side surface of the electrode 61 abuts against the upper end of the reference sphere 31. At this time, the controller of the CNC electric discharge drilling machine 6 displays and records the three-dimensional coordinates (X2, Y2, Z2) of the current electrode 61. Refer to Figure 6 , manually adjust the position of the electrode 61 within the XZ plane so that the side surface of the electrode 61 abuts against the lower end of the reference sphere 31. At this time, the controller of the CNC electric discharge drilling machine 6 displays and records the three-dimensional coordinates (X3, Y3, Z3) of the current electrode 61. Calculate the three-dimensional coordinates of the center of the reference sphere 31 in the CNC electric discharge drilling machine 6. The three-dimensional coordinates of the center of the reference sphere 31 are Calculate the three-dimensional coordinates of the marked position 51 on the workpiece 5 in the CNC electric discharge drilling machine 6. The three-dimensional coordinates of the marked position 51 are Control the electrode 61 to move to the three-dimensional coordinates of the marked position 51 on the workpiece 5 through the CNC electric discharge drilling machine 6, and then the electrode 61 works to drill holes in the workpiece 5. The positioning device for three-dimensional hole machining of the present application can assist in measuring the three-dimensional coordinates of the marked position on the workpiece 5 to be machined in the CNC electric discharge drilling machine 6. The measured three-dimensional coordinates have high accuracy and small error, thereby improving the machining accuracy of the three-dimensional holes machined on the workpiece 5.

[0040] The embodiment of the present application also discloses a three-dimensional hole machining method based on three coordinates, including the steps: S1. Place the positioning device on the upper surface of the workpiece 5. The positioning device is the positioning device for three-dimensional hole machining in the above embodiment. Mark the position on the workpiece 5 where holes need to be drilled. Adjust the angle of the reference rod 32 so that the length direction of the reference rod 32 is consistent with the extension direction of the holes to be machined on the workpiece 5. Then fix the base 1 of the positioning device on the upper surface of the workpiece 5 by gluing. The positioning device is placed within 15 cm of the position where holes need to be drilled on the workpiece 5.

[0041] S2. Place the workpiece 5 fixed with the positioning device in a coordinate measuring machine. Adjust the placement state of the workpiece 5 so that the length direction of the reference rod 32 is parallel to the XZ plane in the three-dimensional space coordinate system of the coordinate measuring machine. Use the coordinate measuring machine to measure the three-dimensional coordinates (Xa, Ya, Za) of the center of the reference sphere 31 and the three-dimensional coordinates (Xb, Yb, Zb) of the marked position 51 on the workpiece 5, and calculate the three-dimensional coordinates (Xa - Xb, Ya - Yb, Za - Zb) of the marked position 51 on the workpiece 5 relative to the center of the reference sphere 31.

[0042] S3. Place the measured workpiece 5 on the workbench 62 of the CNC electric discharge drilling machine 6, and use a dial indicator to calibrate the angle of the electrode 61 of the CNC electric discharge drilling machine 6 so that the perforation direction of the electrode 61 is parallel to the XZ plane in the three-dimensional space coordinate system of the CNC electric discharge drilling machine 6. Adjust the placement state of the workpiece 5 so that the length direction of the reference rod 32 is parallel to the XZ plane in the three-dimensional space coordinate system of the CNC electric discharge drilling machine 6.

[0043] S4. Adjust the angle of the electrode 61 so that the perforation direction of the electrode 61 is consistent with the length direction of the reference rod 32.

[0044] S5. Fix and install the workpiece 5 on the workbench 62.

[0045] S6. Manually move the center of the electric discharge outlet end face of the electrode 61 to abut against the upper front end of the reference sphere 31. At this time, the controller of the CNC electric discharge drilling machine 6 displays and records the three-dimensional coordinates (X1, Y1, Z1) of the current electrode 61; manually adjust the position of the electrode 61 in the XZ plane so that the side surface of the electrode 61 abuts against the upper end of the reference sphere 31. At this time, the controller of the CNC electric discharge drilling machine 6 displays and records the three-dimensional coordinates (X2, Y2, Z2) of the current electrode 61; manually adjust the position of the electrode 61 in the XZ plane so that the side surface of the electrode 61 abuts against the lower end of the reference sphere 31. At this time, the controller of the CNC electric discharge drilling machine 6 displays and records the three-dimensional coordinates (X3, Y3, Z3) of the current electrode 61.

[0046] S7. Calculate the three-dimensional coordinates of the center of the reference sphere 31 in the CNC electric discharge drilling machine 6. The three-dimensional coordinates of the center of the reference sphere 31 are

[0047] S8. Calculate the three-dimensional coordinates of the marked position 51 on the workpiece 5 in the CNC electric discharge drilling machine 6. The three-dimensional coordinates of the marked position 51 are

[0048] S9. Control the electrode 61 to move to the three-dimensional coordinates of the marked position 51 on the workpiece 5 through the CNC electric discharge drilling machine 6, and the electrode 61 works to perforate on the workpiece 5.

[0049] The three-dimensional hole machining method based on three coordinates of the present application can accurately measure the three-dimensional coordinates of the marked position on the workpiece 5 to be machined in the CNC electric discharge drilling machine 6, thereby improving the machining accuracy of the three-dimensional holes machined on the workpiece 5.

[0050] The embodiments of the specific implementation manners are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A three-dimensional hole machining method based on three coordinate axes, characterized in that: Including steps: S1. Place the positioning device on the upper surface of the workpiece (5), mark the positions on the surface of the workpiece (5) where holes need to be drilled. Adjust the angle of the reference rod (32) so that the length direction of the reference rod (32) is consistent with the extension direction of the holes to be machined on the workpiece (5). Then fix the base (1) of the positioning device on the upper surface of the workpiece (5). The positioning device for three-dimensional hole machining includes a base (1), a support member (2), and a reference member (3). The base (1) is used to be fixed on the workpiece (5). The reference member (3) includes a reference ball (31) and a reference rod (32). The reference rod (32) is a straight rod. The reference ball (31) is fixed at one end of the reference rod (32). A first threaded hole penetrating along the direction perpendicular to the length direction of the reference rod (32) is provided at the other end of the reference rod (32). A second threaded hole is provided at one end of the support member (2). The reference rod (32) is fixedly installed at one end of the support member (2) through a bolt (4). The bolt (4) is screwed and installed in the first threaded hole and the second threaded hole. The other end of the support member (2) is fixed on the base (1). The bolt (4) is arranged in a horizontal state. S2. Place the workpiece (5) with the positioning device fixed in a coordinate measuring machine. Adjust the placement state of the workpiece (5) so that the length direction of the reference rod (32) is parallel to the XZ plane in the three-dimensional space coordinate system of the coordinate measuring machine. Use the coordinate measuring machine to measure the three-dimensional coordinates (Xa, Ya, Za) of the center of the reference ball (31) and the three-dimensional coordinates (Xb, Yb, Zb) of the marked position (51) on the workpiece (5), and calculate the three-dimensional coordinates (Xa - Xb, Ya - Yb, Za - Zb) of the marked position (51) on the workpiece (5) relative to the center of the reference ball (31). S3. Place the measured workpiece (5) on the workbench (62) of the CNC electric discharge drilling machine (6). Calibrate the angle of the electrode (61) of the CNC electric discharge drilling machine (6) so that the drilling direction of the electrode (61) is parallel to the XZ plane in the three-dimensional space coordinate system of the CNC electric discharge drilling machine (6). Adjust the placement state of the workpiece (5) so that the length direction of the reference rod (32) is parallel to the XZ plane in the three-dimensional space coordinate system of the CNC electric discharge drilling machine (6). S4. Adjust the angle of the electrode (61) so that the drilling direction of the electrode (61) is consistent with the length direction of the reference rod (32). S5. Fix the workpiece (5) on the workbench (62). S6. Manually move the center of the spark discharge outlet end face of the electrode (61) to abut against the upper front end of the reference sphere (31). At this time, the controller of the numerically controlled electric discharge drilling machine (6) displays and records the three-dimensional coordinates (X1, Y1, Z1) of the current electrode (61); manually adjust the position of the electrode (61) in the XZ plane so that the side surface of the electrode (61) abuts against the upper end of the reference sphere (31). At this time, the controller of the numerically controlled electric discharge drilling machine (6) displays and records the three-dimensional coordinates (X2, Y2, Z2) of the current electrode (61); manually adjust the position of the electrode (61) in the XZ plane so that the side surface of the electrode (61) abuts against the lower end of the reference sphere (31). At this time, the controller of the numerically controlled electric discharge drilling machine (6) displays and records the three-dimensional coordinates (X3, Y3, Z3) of the current electrode (61). S7. Calculate the three-dimensional coordinates of the center of the reference sphere (31) in the CNC electric discharge drilling machine (6). The three-dimensional coordinates of the center of the reference sphere (31) are S8. Calculate the three-dimensional coordinates of the marked position (51) on the workpiece (5) in the CNC electric discharge drilling machine (6). The three-dimensional coordinates of the marked position (51) are S9. Control the electrode (61) to move to the three-dimensional coordinates of the marked position (51) on the workpiece (5) through the numerically controlled electric discharge drilling machine (6), and the electrode (61) works to drill a hole in the workpiece (5).

2. The three-dimensional hole machining method based on three coordinates according to claim 1, characterized in that: In step S1, the base (1) of the positioning device is fixed on the upper surface of the workpiece (5) by means of gluing.

3. The three-dimensional hole machining method based on three coordinates according to claim 1, characterized in that: In step S3, a dial indicator is used to calibrate the angle of the electrode (61) of the numerically controlled electric discharge drilling machine (6).

4. The three-dimensional hole machining method based on three coordinates according to claim 1, characterized in that: In step S1, the positioning device is placed within 15 cm of the position where the hole needs to be drilled on the workpiece (5).

5. The three-dimensional hole machining method based on three coordinates according to claim 1, characterized in that: The reference rod (32) is cylindrical, and the center line of the reference rod (32) passes through the center of the reference sphere (31).

6. The three-dimensional hole machining method based on three coordinates according to claim 5, wherein: One end of the reference rod (32) for connecting with the support member (2) is fixedly provided with a flat plate-shaped connecting portion (33). The center line of the reference rod (32) is parallel to the plane where the connecting portion (33) is located. One end of the support member (2) for connecting with the reference rod (32) is formed with a fitting surface (21) adapted to fit the connecting portion (33). The first threaded hole is located on the connecting portion (33), and the second threaded hole is located on the fitting surface (21).

7. The three-dimensional hole machining method based on three coordinates according to claim 6, characterized in that: The support member (2) is perpendicular to the base (1). A positioning plane (22) is formed on the side of the support member (2) facing away from the connecting portion (33), and the positioning plane (22) is parallel to the plane where the connecting portion (33) is located.

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