Micro-hole electric spark forming machining device and method

Abstract

The invention relates to the technical field of micropore electric spark forming machining, in particular to a micropore electric spark forming machining device and method.The device comprises an electric spark machine tool spindle, a zero-point positioner, a zero-point positioning chuck and a device body, the zero-point positioner is installed at the tail end of the electric spark machine tool spindle, and one end of the zero-point positioning chuck is connected with the zero-point positioner; the device body is installed on the connecting shaft, and a wheel set formed by a first driven wheel and a second driven wheel, a wheel set formed by a third driven wheel and a driving wheel and a wheel set formed by a fourth driven wheel and a fifth driven wheel are arranged on the outer side face of the device body. Gaps for micro electrodes with the diameter smaller than 0.1 mm to pass through are formed between the first driven wheel and the second driven wheel, between the third driven wheel and the driving wheel and between the fourth driven wheel and the fifth driven wheel, a conductive clamping device is arranged at the tail end of the device body, and the micro electrodes penetrate through the gaps of the wheel sets and the conductive clamping device. Machining current is transmitted to the micro electrode through the electric spark machine tool spindle and the conductive clamping device.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-hole electrospark forming processing, and in particular to a micro-hole electrospark forming processing device and method, and in particular to an electrode positioning, clamping, compensation device and processing method in electrospark forming processing of micro-holes less than φ0.1 mm. Background Art

[0002] Microholes usually refer to holes smaller than φ0.1 mm. Microhole processing technology can generally be divided into two categories: mechanical processing and special processing. Among them, mechanical processing is mainly based on high-speed drilling. The main difficulties of microhole drilling technology are: (1) The rigidity of micro drills is poor and they are very easy to break. In addition, the chips are very easy to wrap around the drills due to the small chip removal space during processing, which has a great impact on the stability of the processing process; (2) Micro drills have low chip cutting force and require a higher linear speed. Generally, the processing speed is required to be above 30,000 r / min, which places high requirements on the precision of the machine tool spindle and tool installation. Generally, it is difficult for machine tool working conditions to meet the requirements of stable processing; (3) Since the diameter of the chip cutting tool is small, it is generally limited by the difficulty of tool manufacturing and processing, and the processing depth-to-diameter ratio is difficult to reach more than 20.

[0003] Special processing mainly includes EDM, which is suitable for conductive metal materials. EDM is a non-contact discharge processing with no chip force, and can be used for thin-walled parts processing. However, for micro-hole EDM of less than φ0.1mm, considering the discharge gap, the electrode diameter is about 0.005mm~0.008mm, and the length is 300mm. The electrode wire material is cemented carbide, and the electrode wire diameter is the same as a hair, which is easy to break and very difficult to clamp. At the same time, the electrode clamping mechanism has a great influence on the stability of the discharge. The mechanism not only needs to have high-precision positioning and clamping functions, but also needs to realize the length compensation function according to the discharge wear of the electrode wire. Therefore, the electrode clamping mechanism in micro-hole EDM is required to have high precision, good reliability, and the ability to compensate according to the amount of wear.

[0004] The existing high-speed drilling methods for micro-hole processing at home and abroad can achieve hole processing of >0.1mm. For micro-holes <0.1mm, there are problems such as expensive processing equipment, low hardness of processing materials, and small processing depth. When processing micro-holes <0.1mm by electroforming, there is currently no installation device for 0.005mm-0.008mm fine carbide processing electrodes. At the same time, the length of the processing electrode is 300mm, which is easy to break and difficult to clamp and feed. At the same time, compensation adjustment during the processing process is realized. Summary of the invention

[0005] The purpose of the present invention is to propose a micro-hole electric spark machining device and a machining method, which are easy to operate, have good stability, good precision control, high machining efficiency, stable and reliable quality, and can be used for clamping electrodes when electromachining micro-holes less than 0.1mm, meeting the micro-hole electrode installation, positioning, clamping and compensation requirements for mass production of parts.

[0006] Technical solution:

[0007] A micro-hole electrospark forming processing device comprises an electrospark machine tool spindle 1, a zero point locator 2, a zero point positioning chuck 3 and a device body 5, wherein the zero point locator 2 is mounted at the end of the electrospark machine tool spindle 1, one end of the zero point positioning 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 mounted on the connecting shaft 4, and the outer side surface of the device body 5 is provided with a driven wheel 1 9, a driven wheel 2 10 formed by a wheel group, a driven wheel 3 11, a driving wheel 14 formed by a wheel group and a driven wheel 10 formed by a driven wheel 10 from top to bottom. A wheel group is formed by wheel four 12 and driven wheel five 13, gaps for fine electrodes with a diameter less than 0.1 mm to pass through are arranged between driven wheel one 9 and driven wheel two 10, between driven wheel three 11 and driving wheel 14, and between driven wheel four 12 and driven wheel five 13, a conductive clamping device 16 is arranged at the end of the device body 5, and the fine electrode 17 passes through the gap of the wheel group and the conductive clamping device 16, and the machining current is transmitted to the working end of the fine electrode 17 through the spindle 1 of the EDM machine tool and the conductive clamping device 16.

[0008] Furthermore, a linear frame 6 is provided at the upper end of the device body 5, a wire lead terminal 7 is provided at the upper end of the linear frame 6, and a fixed wire terminal 8 is provided at the lower end, and the fine electrode 17 can pass through the wire lead terminal 7 and the fixed wire terminal 8.

[0009] Furthermore, a second fixed wire end 15 is provided at the lower end of the connecting shaft 4 , and the fine electrode 17 can pass through the second fixed wire end 15 .

[0010] Furthermore, the part 18 to be processed is installed on the machine tool worktable 20 through the part positioning tool 19 , and the part 18 to be processed is located directly below the end of the fine electrode 17 .

[0011] Further, the driven wheel 1 9, the driven wheel 2 10, the driven wheel 4 12, and the driven wheel 5 13 are all installed on the side of the device body 5 through the middle support 22 and the long support 23, and an insulating sleeve 21 is arranged between the driven wheel 1 9, the driven wheel 2 10, the driven wheel 4 12, and the driven wheel 5 13 and the middle support 22; the driven wheel 3 11 is installed on the side of the device body 5 through the short support 25, and an insulating sleeve 21 is arranged between the driven wheel 3 11 and the short support 25;

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

[0013] Furthermore, a mounting hole for mounting the output shaft of the servo motor 28 is provided on the device body 5, and two symmetrical elastic adjustment devices 26 are provided in the mounting hole, and a circular channel is provided between the two elastic adjustment devices 26, and the circular channel 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, and the channel distance between the two elastic adjustment devices 26 is adjusted by rotating the screws, thereby adjusting the distance between the driving 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. Symmetrical bosses are arranged on the outer circle of the guide sleeve 27. The two bosses are respectively connected one by one with the springs arranged in the inner holes of the two elastic adjustment devices 26. By adjusting the spring clamping force, the gap between the driving wheel 14 and the driven wheel 11 can be fine-tuned.

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

[0016] A micro-hole electrospark machining method, which is performed using the machining device, comprises the following steps:

[0017] Step 1: Set the coordinate zero points X0, Y0 and Z0 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, so 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 point X01, Y01 and Z01 of the part 18 to be processed. After the part 18 to be processed is mounted on the machine tool worktable 20, the center of the part 18 to be processed is aligned by the machine tool probe, and X01, Y01 and Z01 of the part 18 to be processed are set;

[0020] Step 3: Set EDM parameters:

[0021] First, define the materials of the micro-electrode 17 and the part to be processed 18 in the machine tool processing program. The material of the micro-electrode 17 is selected as carbide material, and the material of the part to be processed 18 is selected as steel material. In the machine tool program, the processing cavity selects the small hole processing mode, the processing lightness selects Ra0.32, and the surface area of ​​the cavity is defined as 0.005cm 2 , the discharge gap is selected as 0.02mm, and the processing depth is selected according to the drawing requirements;

[0022] Step 4, editing the relative position coordinates of the EDM hole with respect to the part to be processed 18, and then using the EDM machine tool system to generate an EDM program;

[0023] Step 5: The EDM machine starts processing, the EDM machine spindle 1 is powered on, and the EDM machine spindle 1 moves up and down in the vertical Z direction, and discharges the workpiece 18 through the fine electrode 17, and the workpiece 18 is subjected to electro-corrosion forming processing;

[0024] Furthermore, during the processing of step five, when the fine electrode 17 is worn, the machine tool processing program is suspended, and the servo motor 28 is started, the conductive clamping device 16 is opened, and the fine electrode 17 is driven by the driving wheel 14 to compensate downward.

[0025] Beneficial effects:

[0026] The present invention proposes a micro-hole electric spark machining device and a machining method. The device and the method are easy to operate, have good stability, good precision control, high machining efficiency, stable and reliable quality, and can be used for clamping electrodes when electromachining micro-holes less than 0.1 mm, meeting the micro-hole electrode installation, positioning, clamping and compensation requirements for mass production of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. It is obvious that 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 work.

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

[0029] Among them, 1-spark spindle, 2-zero point positioning device, 3-zero point positioning chuck, 4-connecting shaft, 5-device body, 6-linear frame, 7-wire lead end, 8-fixed wire end one, 9-driven wheel one, 10-driven wheel two, 11-driven wheel three, 12-driven wheel four, 13-driven wheel five, 14-driving wheel, 15-fixed wire end two, 16-conductive holding device, 17-fine electrode, 18-parts to be processed, 19-part positioning tooling, 20-machine tool worktable, 21-insulating sleeve, 22-middle support, 23-long support, 24-driving shaft, 25-short support, 26-elastic adjustment device, 27-guide sleeve, 28-servo electrode, 29-push rod type electromagnetic suction mechanism;

[0030] Figure 2 for Figure 1 Cross-sectional view along AA or CC direction;

[0031] Figure 3 for Figure 1 Cross-sectional view along direction BB;

[0032] Figure 4 This is a schematic diagram of the push rod type electromagnetic suction mechanism in the open state;

[0033] Figure 5 It is a schematic diagram of the closed state of the push rod type electromagnetic suction mechanism. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] One embodiment of the present invention is to provide a micro-hole electric spark forming processing device, including an electric spark machine tool spindle 1, a zero point locator 2, a zero point positioning chuck 3 and a device body 5, the zero point locator 2 is installed at the end of the electric spark machine tool spindle 1, one end of the zero point positioning chuck 3 is connected to the zero point locator 2, and the other end is connected to the connecting shaft 4, the device body 5 is installed on the connecting shaft 4, and the outer side surface of the device body 5 is provided with a wheel group formed by a driven wheel 1 9 and a driven wheel 2 10 from top to bottom, a wheel group formed by a driven wheel 3 11 and a driving wheel 14, and a wheel group formed by a driven wheel 4 12 and a driven wheel 5 13, and a straight line is provided between the driven wheel 1 9 and the driven wheel 2 10, between the driven wheel 3 11 and the driving wheel 14, and between the driven wheel 4 12 and the driven wheel 5 13. A conductive clamping device 16 is provided at the end of the device body 5, and the fine electrode 17 passes through the gap of the wheel group and the conductive clamping device 16. The machining current is transmitted to the working end of the fine 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 device body 5, a wire lead terminal 7 is provided at the upper end of the linear frame 6, and a fixed wire terminal 8 is provided at the lower end, and the fine electrode 17 can pass through the wire lead terminal 7 and the fixed wire terminal 8; a fixed wire terminal 2 15 is provided at the lower end of the connecting shaft 4, and the fine electrode 17 can pass through the fixed wire terminal 2 15; the part 18 to be machined is installed on the machine tool workbench 20 through the part positioning tool 19, and the part 18 to be machined is located directly below the end of the fine electrode 17.

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

[0039] Among them, a mounting hole for mounting the output shaft of the servo motor 28 is provided on the device body 5, and two symmetrical elastic adjustment devices 26 are provided in the mounting hole, and a circular channel is provided between the two elastic adjustment devices 26, and the circular channel 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, and the channel distance between the two elastic adjustment devices 26 is adjusted by rotating the screws, so as to adjust the distance between the driving 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. Symmetrical bosses are arranged on the outer circle of the guide sleeve 27. The two bosses are respectively connected to the springs arranged in the inner holes of the two elastic adjustment devices 26 in a one-to-one correspondence. By adjusting the spring clamping force, the gap between the driving wheel 14 and the driven wheel 11 can be fine-tuned.

[0041] The conductive holding device 16 is a push rod type electromagnetic attraction mechanism 29 .

[0042] The spindle 1 of the EDM machine tool in the present invention is the main body that supports and connects various functional components of the micro-hole EDM device, and plays a role in positioning and aligning the processing of the micro-hole. The zero-point positioning device 2 is installed at the end of the spindle, and high-precision repeated positioning accuracy is achieved through the zero-point positioning chuck 3. The device body 1 of the micro-hole EDM device is installed in the mounting hole of the zero-point positioning chuck 3 and is installed and clamped by a precision clip. The electric fine electrode 17 less than 0.1mm is introduced into the device body 5 through the lead wire end 8, and extends to the driven wheel 19 and the driven wheel 2 10 at CC through the fixed wire end 8. After passing through the driven wheel 19 and the driven wheel 2 10, it continues to pass through the driving wheel 14 and the driven wheel 3 11 at BB at the lower end, and under the drive of the driving wheel 14, it passes through the driven wheel 4 12 and the driven wheel 5 13 at AA. The electrode passes through the fixed wire end 2 15, and then the electrode is led out through the conductive clamping device 16 to achieve the installation and support of the fine electrode 17. The parts mounted on the machine tool workbench are processed by the Z-direction reciprocating motion of the EDM machine tool spindle 1.

[0043] In addition, since the fine electrode 17 is very easy to break, the driving wheel 14 and the driven wheel in the device are both made of non-metallic materials with a certain elasticity, which can play a good guiding and transmission role and will not break the fine electrode 17. The driven wheels of the AA view and the CC view are installed on the middle support 22 and the long support 23 of the device body. At the same time, the non-metallic driving wheel 14 and the driven wheel will not generate gap discharge with the fine electrode 17, preventing the fine electrode 17 from breaking due to abnormal discharge.

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

[0045] Among them, the driving wheel 14 of the driving part of the micro-electrode of the device of the present invention has an elastic adjustment device 26, which can fine-tune 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 cause the micro-electrode 17 to break when moving due to excessive or insufficient clamping force.

[0046] The device of the present invention realizes the discharge machining part as the conductive holding device 16. The conductive holding device 16 is the only device in the entire device of the present invention that provides current and voltage to the fine electrode 17. This part cannot have a discharge gap, otherwise abnormal discharge will occur and the wire will be broken. Therefore, the conductive holding device 16 is a push rod type electromagnetic suction mechanism 19. This device realizes the function that it must be completely clamped during the electric spark forming machining, and can be released when the fine electrode 17 moves in compensation. The conductive holding device 16 in the device of the present invention is a push rod type electromagnetic suction mechanism 29, the opening and closing voltage signal of the mechanism is connected to the electrical signal of the servo electrode 28 on the driving wheel 14. When the servo motor 28 is not working, it is in a power-off state, and the push rod type electromagnetic suction mechanism 29 is in a clamping holding state, thereby clamping the fine electrode 17. When the servo electrode 28 moves, it is in a power-on state, and the push rod type electromagnetic suction mechanism 29 is in a loose state, realizing the automatic compensation function of the fine electrode 17.

[0047] This embodiment also provides a micro-hole electrospark machining method, which is performed using the machining device, and includes the following steps:

[0048] Step 1: Set the coordinate zero points X0, Y0 and Z0 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, so 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 point X01, Y01 and Z01 of the part 18 to be processed. After the part 18 to be processed is mounted on the machine tool worktable 20, the center of the part 18 to be processed is aligned by the machine tool probe, and X01, Y01 and Z01 of the part 18 to be processed are set;

[0051] Step 3: Set EDM parameters:

[0052] First, define the materials of the micro-electrode 17 and the part to be processed 18 in the machine tool processing program. The material of the micro-electrode 17 is selected as carbide material, and the material of the part to be processed 18 is selected as steel material. In the machine tool program, the processing cavity selects the small hole processing mode, the processing lightness selects Ra0.32, and the surface area of ​​the cavity is defined as 0.005cm 2, the discharge gap is selected as 0.02mm, and the processing depth is selected according to the drawing requirements;

[0053] Step 4, editing the relative position coordinates of the EDM hole with respect to the part to be processed 18, and then using the EDM machine tool system to generate an EDM program;

[0054] Step 5: The EDM machine starts processing, the EDM machine spindle 1 is powered on, and the EDM machine spindle 1 moves up and down in the vertical Z direction, and discharges the workpiece 18 through the fine electrode 17, and the workpiece 18 is subjected to electro-corrosion forming processing; during the processing of step 5, when the fine electrode 17 is worn, the machine processing program is suspended, and the servo motor 28 is started, the conductive clamping device 16 is opened, and the fine electrode 17 is driven by the driving wheel 14 to compensate downward.

[0055] The micro-electrode 17 can quickly realize clamping and positioning and find the coordinate zero point of the electrode, wherein the micro-electrode is installed in a 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, and the height of the micro-hole EDM device is fixed, so the spindle height plus the height of the EDM device can determine the electrode Z0.

[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 technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A micro-hole electrospark forming processing device, characterized in that: The invention comprises an electric discharge machine spindle, a zero point locator, a zero point locating chuck and a device body. The zero point locator is installed at the end of the electric discharge machine spindle. One end of the zero point locating chuck is connected to the zero point locator, and the other end is connected to the connecting shaft. The device body is installed on the connecting shaft. From top to bottom, the outer side surface of the device body is provided with a wheel group formed by a driven wheel 1 and a driven wheel 2, a wheel group formed by a driven wheel 3 and a driving wheel, and a wheel group formed by a driven wheel 4 and a driven wheel 5. Gaps for passing a fine electrode with a diameter less than 0.1 mm are provided between the driven wheel 1 and the driven wheel 2, between the driven wheel 3 and the driving wheel, and between the driven wheel 4 and the driven wheel 5. A conductive clamping device is provided at the end of the device body. The fine electrode passes through the gap of the wheel group and the conductive clamping device. The machining current is transmitted to the working end of the fine electrode through the electric discharge machine spindle and the conductive clamping device.

2. The micro-hole electric spark forming processing device according to claim 1 is characterized in that: A linear frame is arranged at the upper end of the device body, a wire lead end is arranged at the upper end of the linear frame, and a fixed wire end one is arranged at the lower end, and the fine electrode can pass through the wire lead end and the fixed wire end one.

3. The micro-hole electric spark forming processing device according to claim 1 is characterized in that: A second fixed wire end is arranged at the lower end of the connecting shaft, and the fine electrode can pass through the second fixed wire end.

4. The micro-hole electric spark forming processing device according to claim 1, characterized in that: The part to be processed is installed on the workbench of the machine tool through a part positioning tool, and the part to be processed is located directly below the end of the micro-electrode.

5. The micro-hole electrospark forming processing device according to claim 1, characterized in that: The driven wheel 1, the driven wheel 2, the driven wheel 4 and the driven wheel 5 are all installed on the side of the device body through the middle support and the long support, and an insulating sleeve is provided between the driven wheel 1, the driven wheel 2, the driven wheel 4 and the driven wheel 5 and the middle support; the driven wheel 3 is installed on the side of the device body through the short support, and an insulating sleeve is provided between the driven wheel 3 and the short support; The driving wheel is connected to the output shaft of the servo motor through a driving shaft, and the driving wheel is made of insulating resin material.

6. The micro-hole electric spark forming processing device according to claim 5, characterized in that: The device body is provided with a mounting hole for mounting the output shaft of the servo motor, and two symmetrical elastic adjustment devices are arranged in the mounting hole, and a circular channel is provided between the two elastic adjustment devices, and the circular channel is connected to the mounting hole; the two elastic adjustment devices are installed in the mounting hole of the device body by screws, and the channel distance between the two elastic adjustment devices is adjusted by rotating the screws, thereby achieving the adjustment of the distance between the driving wheel and the driven wheel three.

7. The micro-hole electric spark forming processing device according to claim 6, characterized in that: It also includes a guide sleeve, which is connected to the output shaft of the servo motor. Symmetrical bosses are arranged on the outer circle of the guide sleeve. The two bosses are respectively connected to the springs arranged in the inner holes of the two elastic adjustment devices in a one-to-one correspondence. By adjusting the clamping force of the springs, the gap between the driving wheel and the driven wheel can be fine-tuned.

8. The micro-hole electric spark forming processing device according to claim 7, characterized in that: The conductive holding device is a push rod type electromagnetic suction mechanism.

9. A micro-hole electrospark machining method, using the machining device according to any one of claims 1 to 8, characterized in that: The following steps are involved: 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 spindle 1. 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 device is fixed, so the Z0 of the micro-electrode is determined by adding the height of the EDM machine spindle to the height of the EDM device body. Step 2: Set the coordinate zero points X01, Y01 and Z01 of the part to be processed. After the part to be processed is mounted on the machine tool worktable, the center of the part to be processed is aligned by the machine tool probe, and X01, Y01 and Z01 of the part to be processed are set. Step 3: Set EDM parameters: First, define the materials of the micro-electrode and the part to be processed in the machine tool processing program. The material of the micro-electrode is selected as carbide material, and the material of the part to be processed is selected as steel material. In the machine tool program, the processing cavity selects the small hole processing mode, the processing brightness selects Ra0.32, and the surface area of ​​the cavity is defined as 0.005cm 2 , the discharge gap is selected as 0.02mm, and the processing depth is selected according to the drawing requirements; Step 4, editing the relative position coordinates of the EDM hole with respect to the part to be processed, and then using the EDM machine tool system to generate an EDM program; Step 5: The EDM machine starts processing, the EDM machine spindle is powered on, and the EDM machine spindle moves up and down in the vertical Z direction, discharges the workpiece through the micro-electrode, and performs electro-corrosion forming processing on the workpiece.

10. The method according to claim 9, characterized in that During the processing of step five, when the fine electrode is worn, the machine tool processing program is suspended, and the servo motor is started, the conductive clamping device is opened, and the fine electrode is driven by the driving wheel to compensate downward.

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