A micro-holes electric spark forming machining device and method

Abstract

The present application relates to the technical field of micro-hole electric spark forming machining, and particularly relates to a micro-hole electric spark forming machining device and method, which comprises an electric spark machine tool spindle, a zero point positioner, a zero point positioning chuck and a device main body, the zero point positioner is installed at the end of the electric spark machine tool spindle, one end of the zero point positioning chuck is connected with the zero point positioner, the other end is connected with a connecting shaft, the device main body is installed on the connecting shaft, a wheel set formed by a driven wheel one and a driven wheel two, a wheel set formed by a driven wheel three and a driving wheel, and a wheel set formed by a driven wheel four and a driven wheel five are arranged on the outer side of the device main body, gaps for passing through micro-electrodes with a diameter less than 0.1 mm are arranged between the driven wheel one and the driven wheel two, between the driven wheel three and the driving wheel, and between the driven wheel four and the driven wheel five, a conductive clamping device is arranged at the end of the device main body, the micro-electrode passes through the gaps of the wheel set and the conductive clamping device, and a machining current is transmitted to the micro-electrode through the electric spark machine tool spindle and the conductive clamping device.

Description

Technical Field

[0001] This invention relates to the field of micro-hole electrical discharge machining technology, specifically to a micro-hole electrical discharge machining apparatus and method, and more particularly to an electrode positioning, clamping, compensation device and machining method for electrical discharge machining of micro-holes smaller than φ0.1mm. Background Technology

[0002] Microholes typically refer to holes smaller than φ0.1mm. Microhole machining technology can generally be divided into two categories: machining and special machining. Among them, machining mainly involves high-speed drilling. The main difficulties of microhole drilling technology are: (1) Micro drill bits have poor rigidity and are very easy to break. During the machining process, due to the narrow chip removal space, the chips are very easy to wrap around the drill bit, which has a significant impact on the stability of the machining process; (2) Micro drill bits have low chip cutting force and require high linear speed. Generally, the machining speed is required to be above 30,000 r / min. The precision requirements for the machine tool spindle and tool installation are very high. It is generally difficult to achieve stable machining under normal machine tool conditions; (3) Due to the small diameter of the cutting tool, it is generally limited by the difficulty of tool manufacturing and machining. The machining depth-to-diameter ratio is difficult to reach above 20.

[0003] Specialized machining primarily involves electrical discharge machining (EDM). This method is suitable for conductive metal materials and, being a non-contact process with no cutting force, can be used for machining thin-walled parts. However, for EDM machining of micro-holes smaller than φ0.1mm, considering the discharge gap, the electrode diameter is approximately 0.005mm to 0.008mm, while the length is 300mm. The electrode wire is made of cemented carbide, with a diameter similar to a human hair, making it prone to breakage and extremely difficult to clamp. Furthermore, the electrode clamping mechanism significantly impacts the stability of the discharge. This mechanism not only needs high-precision positioning and clamping capabilities but also requires length compensation based on electrode wire wear. Therefore, the electrode clamping mechanism in micro-hole EDM requires high precision, high reliability, and the ability to compensate for wear.

[0004] Existing high-speed drilling methods for micro-hole machining, both domestically and internationally, can achieve hole machining greater than 0.1 mm. However, for micro-holes smaller than 0.1 mm, there are issues such as expensive machining equipment, low material hardness, and limited machining depth. While electrical discharge machining (EDM) can machine micro-holes smaller than 0.1 mm, current methods lack a device for mounting fine cemented carbide electrodes (0.005 mm to 0.008 mm in diameter). Furthermore, these electrodes are 300 mm long, which presents challenges such as breakage, difficulty in clamping, and feeding, while also requiring compensation and adjustment during the machining process. Summary of the Invention

[0005] The purpose of this invention is to provide a micro-hole electrical discharge machining (EDM) device and method. This device and method are easy to operate, have good stability, good precision control, high processing efficiency, and stable and reliable quality. It can be applied to clamping electrodes when forming micro-holes <0.1mm using EDM, meeting the needs of mass production of parts for micro-hole electrode installation, positioning, clamping, and compensation.

[0006] Technical solution:

[0007] A micro-hole electrical discharge machining (EDM) device includes an EDM machine spindle 1, a zero-point locator 2, a zero-point locating chuck 3, and a device body 5. The zero-point locator 2 is installed at the end of the EDM machine spindle 1. One end of the zero-point locating chuck 3 is connected to the zero-point locator 2, and the other end is connected to a connecting shaft 4. The device body 5 is installed on the connecting shaft 4. From top to bottom, the outer side of the device body 5 is provided with a wheel assembly formed by driven wheel 1 9 and driven wheel 2 10, a wheel assembly formed by driven wheel 3 11 and driving wheel 14, and a driven wheel... The wheel assembly formed by wheel 4 12 and driven wheel 5 13 has gaps between driven wheel 1 9 and driven wheel 2 10, between driven wheel 3 11 and driving wheel 14, and between driven wheel 4 12 and driven wheel 5 13 for micro-electrodes with a diameter of less than 0.1 mm to pass through. A conductive clamping device 16 is provided at the end of the main body 5 of the device. The micro-electrode 17 passes through the gaps in the wheel assembly and the conductive clamping device 16. The machining current is transmitted to the working end of the micro-electrode 17 through the spindle 1 of the EDM machine tool and the conductive clamping device 16.

[0008] Furthermore, a straight frame 6 is provided at the upper end of the main body 5 of the device, a wire-leading end 7 is provided at the upper end of the straight frame 6, and a wire-fixing end 8 is provided at the lower end. The micro electrode 17 can pass through the wire-leading end 7 and the wire-fixing end 8.

[0009] Furthermore, a wire end 2 15 is provided at the lower end of the connecting shaft 4, through which the micro electrode 17 can pass.

[0010] Furthermore, the part to be processed 18 is mounted on the machine tool table 20 by the part positioning fixture 19, and the part to be processed 18 is located directly below the end of the micro electrode 17.

[0011] Furthermore, driven wheels 1-9, 2-10, 4-12, and 5-13 are all mounted on the side of the main body 5 of the device via intermediate support 22 and long support 23. Insulating sleeves 21 are provided between driven wheels 1-9, 2-10, 4-12, and 5-13 and intermediate support 22. Driven wheel 3-11 is mounted on the side of the main body 5 of the device via short support 25. Insulating sleeves 21 are provided between driven wheel 3-11 and short support 25.

[0012] The drive wheel 14 is connected to the output shaft of the servo motor 28 via the drive shaft 24, and the drive wheel 14 is made of insulating resin material.

[0013] Furthermore, the main body 5 of the device is provided with a mounting hole for mounting the output shaft of the servo motor 28. Two symmetrical elastic adjustment devices 26 are provided in the mounting hole, and there is a circular channel between the two elastic adjustment devices 26, which communicates with the mounting hole. The two elastic adjustment devices 26 are installed in the mounting hole of the main body 5 of the device by screws. By rotating the screws, the distance between the channel between the two elastic adjustment devices 26 is adjusted, thereby adjusting the distance between the drive wheel 14 and the driven wheel 11.

[0014] Furthermore, it also includes a guide sleeve 27, which is sleeved on the output shaft of the servo motor 28. The guide sleeve 27 has symmetrical bosses on its outer circle. The two bosses are respectively connected to springs in the inner holes of the two elastic adjustment devices 26. By adjusting the spring clamping force, the gap between the drive wheel 14 and the driven wheel 11 can be finely adjusted.

[0015] Furthermore, the conductive holding device 16 is a push rod type electromagnetic attraction mechanism.

[0016] A micro-hole electrical discharge machining method, using the aforementioned machining apparatus, includes the following steps:

[0017] Step 1: Set the zero points X0, Y0, and Z0 of the coordinate system of the micro-electrode 17 on the machine tool:

[0018] The center of the micro-electrode 17 is the same as the center of the EDM machine spindle 1. The X0 and Y0 of the micro-electrode 17 are determined by the alignment function of the machine tool probe. At the same time, the height of the micro-hole EDM device is fixed. Therefore, the Z0 of the micro-electrode 17 is determined by adding the height of the EDM machine spindle 1 to the height of the EDM device body 5.

[0019] Step 2: Set the coordinate zero points X01, Y01 and Z01 of the part to be processed 18. After installing the part to be processed 18 on the machine tool worktable 20, use the machine tool probe to align the center of the part to be processed 18 and set the X01, Y01 and Z01 of the part to be processed 18.

[0020] Step 3, set the electrical discharge machining parameters:

[0021] First, the materials of the micro-electrode 17 and the part to be machined 18 are defined in the machine tool program. The material of the micro-electrode 17 is selected as cemented carbide, and the material of the part to be machined 18 is selected as steel. In the machine tool program, the small hole machining mode is selected for machining the cavity, the machining surface degree is selected as Ra0.32, and the cavity surface area is defined as 0.005cm². 2 The discharge gap is selected as 0.02mm, and the machining depth is selected according to the drawing requirements;

[0022] Step 4: Edit the relative position coordinates of the EDM hole with respect to the workpiece 18, and then use the EDM machine tool system to generate the EDM program;

[0023] Step 5: Start the EDM machine tool. The EDM machine tool spindle 1 is energized and moves up and down in the vertical Z direction. It discharges through the micro electrode 17 to the workpiece 18 and performs electro-erosion forming on the workpiece 18.

[0024] Furthermore, during the processing in step five, when the micro-electrode 17 wears out, the machine tool processing program is paused, and the conductive clamping device 16 is opened by starting the servo motor 28. The micro-electrode 17 is then driven downward by the drive wheel 14 to compensate.

[0025] Beneficial effects:

[0026] This invention proposes a micro-hole electrical discharge machining (EDM) device and method. The device and method are easy to operate, have good stability, good precision control, high processing efficiency, and stable and reliable quality. They can be applied to clamping electrodes when forming micro-holes <0.1mm using EDM, meeting the needs of batch production of parts for micro-hole electrode installation, positioning, clamping, and compensation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a micro-hole electrical discharge machining device according to the present invention:

[0029] Among them, 1-EDM spindle, 2-Zero point positioning device, 3-Zero point positioning chuck, 4-Connecting shaft, 5-Main body of device, 6-Linear frame, 7-Wire drawing end, 8-Fixing end one, 9-Driven wheel one, 10-Driven wheel two, 11-Driven wheel three, 12-Driven wheel four, 13-Driven wheel five, 14-Drive wheel, 15-Fixing end two, 16-Conductive holding device, 17-Micro electrode, 18-Workpiece to be processed, 19-Workpiece positioning fixture, 20-Machine tool table, 21-Insulating sleeve, 22-Middle support, 23-Long support, 24-Drive shaft, 25-Short support, 26-Elastic adjustment device, 27-Guide sleeve, 28-Servo electrode, 29-Push rod type electromagnetic attraction mechanism;

[0030] Figure 2 for Figure 1 A sectional view along the AA or CC direction;

[0031] Figure 3 for Figure 1 A cross-sectional view along the BB direction;

[0032] Figure 4 A schematic diagram of the open state of the push rod type electromagnetic attraction mechanism;

[0033] Figure 5 This is a schematic diagram of the closed state of the push rod type electromagnetic attraction mechanism. Detailed implementation method:

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0036] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] One embodiment of the present invention provides a micro-hole electrical discharge machining (EDM) device, comprising an EDM machine spindle 1, a zero-point locator 2, a zero-point locating chuck 3, and a device body 5. The zero-point locator 2 is installed at the end of the EDM machine spindle 1. One end of the zero-point locating chuck 3 is connected to the zero-point locator 2, and the other end is connected to a connecting shaft 4. The device body 5 is installed on the connecting shaft 4. From top to bottom, the outer side of the device body 5 is provided with a wheel set consisting of driven wheel 1 9 and driven wheel 2 10, a wheel set consisting of driven wheel 3 11 and driving wheel 14, and a wheel set consisting of driven wheel 4 12 and driven wheel 5 13. A straight-through feed line is provided between driven wheel 1 9 and driven wheel 2 10, between driven wheel 3 11 and driving wheel 14, and between driven wheel 4 12 and driven wheel 5 13. The gap through which a micro-electrode with a diameter less than 0.1 mm passes is provided. A conductive clamping device 16 is provided at the end of the main body 5 of the device. The micro-electrode 17 passes through the gap of the wheel set and the conductive clamping device 16. The machining current is transmitted to the working end of the micro-electrode 17 through the spindle 1 of the EDM machine tool and the conductive clamping device 16. A linear frame 6 is provided at the upper end of the main body 5. A wire-leading end 7 is provided at the upper end of the linear frame 6 and a wire-fixing end 1 8 is provided at the lower end. The micro-electrode 17 can pass through the wire-leading end 7 and the wire-fixing end 1 8. A wire-fixing end 2 15 is provided at the lower end of the connecting shaft 4. The micro-electrode 17 can pass through the wire-fixing end 2 15. The workpiece 18 to be processed is mounted on the machine tool worktable 20 through the workpiece positioning fixture 19, and the workpiece 18 to be processed is located directly below the end of the micro-electrode 17.

[0038] Among them, driven wheel 1 9, driven wheel 2 10, driven wheel 4 12, and driven wheel 5 13 are all mounted on the side of the main body 5 of the device via the middle support 22 and the long support 23. An insulating sleeve 21 is provided between driven wheel 1 9, driven wheel 2 10, driven wheel 4 12, and driven wheel 5 13 and the middle support 22. Drive wheel 3 11 is mounted on the side of the main body 5 of the device via the short support 25. An insulating sleeve 21 is provided between driven wheel 3 11 and the short support 25. Drive wheel 14 is connected to the output shaft of servo motor 28 via drive shaft 24. Drive wheel 14 is made of insulating resin material.

[0039] The device body 5 is provided with a mounting hole for mounting the output shaft of the servo motor 28. Two symmetrical elastic adjustment devices 26 are provided in the mounting hole, and there is a circular channel between the two elastic adjustment devices 26, which is connected to the mounting hole. The two elastic adjustment devices 26 are installed in the mounting hole of the device body 5 by screws. By rotating the screws, the distance between the channel between the two elastic adjustment devices 26 is adjusted, thereby adjusting the distance between the drive wheel 14 and the driven wheel 11.

[0040] It also includes a guide sleeve 27, which is sleeved on the output shaft of the servo motor 28. The guide sleeve 27 has symmetrical bosses on its outer circle. The two bosses are respectively connected to springs in the inner holes of the two elastic adjustment devices 26. By adjusting the spring clamping force, the gap between the drive wheel 14 and the driven wheel 11 can be finely adjusted.

[0041] Among them, the conductive holding device 16 is a push rod type electromagnetic attraction mechanism 29.

[0042] The EDM spindle 1 of this invention serves as the main body supporting and connecting the various functional components of the micro-hole EDM device, playing a role in positioning and aligning the micro-hole machining. A zero-point positioning device 2 is installed at the end of the spindle, achieving high-precision repeatability through a zero-point positioning chuck 3. The main body 1 of the micro-hole EDM device is installed in the mounting hole of the zero-point positioning chuck 3 and clamped by a precision spring clip. A micro-electrode 17 smaller than 0.1 mm is fed into the main body 5 through the lead wire end 8, extends through the fixed wire end 8 to the driven wheels 9 and 10 at CC, and after passing through them, continues downwards through the drive wheel 14 and 11 at BB. Driven by the drive wheel 14, it passes through the driven wheels 12 and 13 at AA. The electrode passes through the fixed wire end 15 and is then led out through the conductive clamping device 16, thus achieving the installation and clamping of the micro-electrode 17. The workpiece mounted on the machine tool worktable is processed by the Z-axis reciprocating motion of the spindle 1 of the EDM machine tool.

[0043] Furthermore, since the microelectrode 17 is very prone to breakage, the drive wheel 14 and driven wheel in this device are both made of non-metallic materials with a certain degree of elasticity, which can play a good guiding and conveying role and will not crush the microelectrode 17 wire. In the AA and CC views, the driven wheel is mounted on the middle support 22 and the long support 23 of the main body of the device. At the same time, the non-metallic drive wheel 14 and driven wheel will not generate gap discharge with the microelectrode 17, preventing the microelectrode 17 from breaking due to abnormal discharge.

[0044] In the device of the present invention, the compensation method of the micro electrode 17 is to generate power through the servo electrode 28 in the BB view. The guide sleeve 27 is installed at the front of the spindle of the servo motor 28. The guide sleeve 27 is connected to the drive shaft 24. The drive wheel 14 is installed on the drive shaft 24 to generate rotational motion. The drive wheel 14 drives the driven wheel 3 11 to rotate through friction, thereby driving the micro electrode 17 between the drive wheel 14 and the driven wheel 3 11 to move downward, compensating for the wear caused by the micro electrode 17 processing the parts.

[0045] In this invention, the drive wheel 14 of the drive part of the micro electrode has an elastic adjustment device 26. The elastic adjustment device 26 can finely adjust the gap according to the different diameters of the electrode wire, so that the micro electrode 17 has a suitable clamping force and will not break the wire when the micro electrode 17 moves due to excessive or insufficient clamping force.

[0046] The electrical discharge machining (EDM) part of the device of this invention is a conductive clamping device 16. This conductive clamping device 16 is the only device in the entire device that provides current and voltage to the micro-electrode 17. This part cannot have a discharge gap, otherwise abnormal discharge will occur and the wire will break. Therefore, the conductive clamping device 16 is a push-rod type electromagnetic attraction mechanism 19. This device achieves the function of being fully clamped during EDM and being able to be released when the micro-electrode 17 is compensating for movement. The conductive clamping device 16 in the device of this invention is a push-rod type electromagnetic attraction mechanism 29. The opening and closing voltage signal of this mechanism is connected to the electrical signal of the servo electrode 28 on the drive wheel 14. When the servo motor 28 is not working, it is in a de-energized state, and the push-rod type electromagnetic attraction mechanism 29 is in a clamping state, thereby clamping the micro-electrode 17. When the servo electrode 28 is moving, it is in an energized state, and the push-rod type electromagnetic attraction mechanism 29 is in a released state, realizing the automatic compensation function of the micro-electrode 17.

[0047] This embodiment also proposes a micro-hole electrical discharge machining method, which is performed using the aforementioned machining apparatus and includes the following steps:

[0048] Step 1: Set the zero points X0, Y0, and Z0 of the coordinate system of the micro-electrode 17 on the machine tool:

[0049] The center of the micro-electrode 17 is the same as the center of the EDM machine spindle 1. The X0 and Y0 of the micro-electrode 17 are determined by the alignment function of the machine tool probe. At the same time, the height of the micro-hole EDM device is fixed. Therefore, the Z0 of the micro-electrode 17 is determined by adding the height of the EDM machine spindle 1 to the height of the EDM device body 5.

[0050] Step 2: Set the coordinate zero points X01, Y01 and Z01 of the part to be processed 18. After installing the part to be processed 18 on the machine tool worktable 20, use the machine tool probe to align the center of the part to be processed 18 and set the X01, Y01 and Z01 of the part to be processed 18.

[0051] Step 3, set the electrical discharge machining parameters:

[0052] First, the materials of the micro-electrode 17 and the part to be machined 18 are defined in the machine tool program. The material of the micro-electrode 17 is selected as cemented carbide, and the material of the part to be machined 18 is selected as steel. In the machine tool program, the small hole machining mode is selected for machining the cavity, the machining surface degree is selected as Ra0.32, and the cavity surface area is defined as 0.005cm². 2The discharge gap is selected as 0.02mm, and the machining depth is selected according to the drawing requirements;

[0053] Step 4: Edit the relative position coordinates of the EDM hole with respect to the workpiece 18, and then use the EDM machine tool system to generate the EDM program;

[0054] Step 5: Start the EDM machine. The EDM machine spindle 1 is energized and moves up and down in the vertical Z direction. The micro-electrode 17 discharges onto the workpiece 18 to be machined, and the workpiece 18 is electro-etched and shaped. During the machining process in Step 5, when the micro-electrode 17 wears, the machine tool machining program is paused. The servo motor 28 is started, the conductive clamping device 16 is opened, and the micro-electrode 17 is driven downward by the drive wheel 14 to compensate.

[0055] The micro-electrode 17 can quickly achieve clamping and positioning and find the zero point of the electrode coordinates. The micro-electrode is installed in the micro-hole EDM device. The center of the micro-hole electrode and the center of the machine tool spindle are on the same axis. The X0 and Y0 of the EDM electrode can be quickly found. The height of the micro-hole EDM device is fixed. Therefore, the Z0 of the electrode can be determined by adding the height of the spindle to the height of the EDM device.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A microporous electrical discharge machining (EDM) device, characterized in that, The device includes an EDM machine spindle, a zero-point positioner, a zero-point positioning chuck, and a main body. The zero-point positioner is installed at the end of the EDM machine spindle. One end of the zero-point positioning chuck is connected to the zero-point positioner, and the other end is connected to a connecting shaft. The main body is installed on the connecting shaft. From top to bottom, the outer side of the main body is provided with a wheel group formed by driven wheel 1 and driven wheel 2, a wheel group formed by driven wheel 3 and driving wheel, and a wheel group formed by driven wheel 4 and driven wheel 5. Gap gaps are provided between driven wheel 1 and driven wheel 2, between driven wheel 3 and driving wheel, and between driven wheel 4 and driven wheel 5 to allow micro-electrodes with a diameter of less than 0.1 mm to pass through. The driving wheel and driven wheels 1, 2, 3, 4, and 5 are all made of non-metallic materials with a certain degree of elasticity. A conductive clamping device is provided at the end of the main body. The micro-electrode passes through the gaps in the wheel groups and the conductive clamping device. The machining current is transmitted to the working end of the micro-electrode through the EDM machine spindle and the conductive clamping device. The conductive clamping device is a push rod type electromagnetic attraction mechanism. The opening and closing voltage signal of this mechanism is connected to the electrical signal of the servo motor on the drive wheel. When the servo motor is not working, it is in a de-energized state, and the push rod type electromagnetic attraction mechanism is in a clamping state, thereby clamping the micro electrode. When the servo motor is moving, it is in an energized state, and the push rod type electromagnetic attraction mechanism is in a released state, realizing the automatic compensation function of the micro electrode. The main body of the device is provided with a mounting hole for mounting the output shaft of the servo motor. Two symmetrical elastic adjustment devices are provided in the mounting hole, and there is a circular channel between the two elastic adjustment devices, which is connected to the mounting hole. The two elastic adjustment devices are installed in the mounting hole of the main body of the device by screws. By rotating the screws, the distance between the two elastic adjustment devices is adjusted, thereby adjusting the distance between the drive wheel and the driven wheel. It also includes a guide sleeve, which is sleeved on the output shaft of the servo motor. The outer circle of the guide sleeve is provided with symmetrical bosses. The two bosses are respectively connected to springs set in the inner holes of two elastic adjustment devices. By adjusting the spring clamping force, the gap between the drive wheel and the driven wheel can be finely adjusted.

2. The microporous electrical discharge machining apparatus according to claim 1, characterized in that, The main body of the device is equipped with a linear frame at the top, with a wire-leading end at the top and a wire-fixing end at the bottom. The micro-electrode can pass through the wire-leading end and the wire-fixing end.

3. The microporous electrical discharge machining apparatus according to claim 1, characterized in that, A second fixed wire end is provided at the lower end of the connecting shaft, through which the micro-electrode can pass.

4. The microporous electrical discharge machining apparatus according to claim 1, characterized in that, The part to be processed is mounted on the machine tool table using a part positioning fixture, and the part to be processed is located directly below the end of the micro electrode.

5. The microporous electrical discharge machining apparatus according to claim 1, characterized in that, Driven wheels one and four are mounted on the side of the device body via a central support. Driven wheels two and five are mounted on the side of the device body via a long support. Insulating sleeves are installed between driven wheels one and four and the central support, and between driven wheels two and five and the long support. Driven wheel three is mounted on the side of the device body via a short support, and an insulating sleeve is installed between driven wheel three and the short support. The drive wheel is connected to the output shaft of the servo motor via a drive shaft, and the drive wheel is made of insulating resin material.

6. A method for micro-hole electrical discharge machining, performed using the machining apparatus as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Set the zero points X0, Y0 and Z0 of the micro-electrode coordinate system on the machine tool; the center of the micro-electrode is the same as the center of the EDM machine tool spindle. The X0 and Y0 of the micro-electrode are determined by the alignment function of the machine tool probe. At the same time, the height of the micro-hole EDM forming processing device is fixed. Therefore, the height of the EDM machine tool spindle plus the height of the main body of the EDM device is determined as the Z0 of the micro-electrode. Step 2: Set the zero points X01, Y01 and Z01 of the coordinates of the part to be processed. After the part to be processed is installed on the machine tool worktable, the center of the part to be processed is found by the machine tool probe, and the X01, Y01 and Z01 of the part to be processed are set. Step 3, set the EDM parameters: First, define the micro-electrode and the material of the workpiece in the machine tool program. Select cemented carbide for the micro-electrode and steel for the workpiece. In the machine tool program, select small hole machining mode for the cavity, Ra0.32 for the machining brightness, define the cavity surface area as 0.005cm², select 0.02mm for the discharge gap, and select the machining depth according to the drawing requirements. Step 4: Edit the relative position coordinates of the EDM hole with respect to the workpiece, and then use the EDM machine tool system to generate the machine tool machining program; Step 5: Start the EDM machine. The EDM machine spindle is energized and moves up and down in the vertical Z direction. It discharges onto the workpiece through a micro-electrode, performing electro-erosion forming on the workpiece.

7. The method according to claim 6, characterized in that, During the processing in step five, when the micro-electrode wears out, the machine tool processing program is paused. The servo motor is started, the conductive clamping device is opened, and the micro-electrode is driven downward to compensate.

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