A micro-spark multi-stage disc electrode grinding device and its use method

Abstract

The present invention discloses a micro-electro-spark multi-stage disc electrode grinding device and its use method. The grinding device comprises an external cylindrical grinding mechanism and an internal cylindrical grinding mechanism, which respectively grind the outer and inner circumferences of a disc electrode for grinding the micro-electrode. The positioning portion, roughing portion, and first finishing portion of the external cylindrical grinding mechanism are all disposed on a first main body. The roughing portion is positioned by the positioning portion, and the disc electrodes of the roughing portion and the first finishing portion sequentially perform roughing and finishing on the micro-electrode. The second finishing portion of the internal cylindrical grinding mechanism is disposed on a second main body, and the disc electrodes of the second finishing portion sequentially perform roughing and finishing on the micro-electrode. The present invention employs two working modes, internal and external, to simultaneously perform roughing and finishing on the micro-electrode, solving the problems of low efficiency and difficult control in the micro-electrode preparation process.

Description

Technical Field

[0001] The present invention relates to the field of electrical machining technology, in particular to a micro-electrical spark multi-stage disc electrode grinding device and a use method thereof. Background Art

[0002] As the size and precision requirements for micro-cavities and flow channels in fields such as aerospace continue to increase, conventional processes are unable to effectively address these challenges. Due to its adaptability, non-contact nature, and zero cutting force, electrospark machining (EDM) is widely used in micromachining applications such as small hole machining. For high-precision small hole machining, the tool electrode also requires extremely high precision. Therefore, ensuring the shape and dimensional accuracy of the micro-electrode has become a key research topic in micro-EDM.

[0003] The working principle of EDM is to generate a pulsed electric spark discharge between the tool and the workpiece, using the localized, instantaneous high temperatures generated during the discharge to remove the metal. During the EDM process, the tool electrode inevitably wears out, necessitating machining and trimming of the micro-tool electrode. Due to the small diameter and high surface quality requirements of micro-tool electrodes, their machining has always been a crucial technology in the field of micro-EDM.

[0004] The current EDM micro-electrode processing mainly includes block electrode grinding and wire electrode grinding. Block electrode grinding uses the reverse copying method to process the electrode. The electrode to be processed rotates and feeds along with it, which has high processing efficiency, but the chips are not easy to be discharged and the shape accuracy is poor. Wire electrode grinding uses point discharge processing, which has high processing accuracy, but very low processing efficiency. In the early experiments, we tried to use wire electrodes to grind micro-electrodes under flushing conditions. Due to the error of servo feed control and the wire electrode jitter caused by the flushing liquid, the micro-electrode appeared gourd-shaped after grinding, and the verticality of the electrode surface was low. Summary of the Invention

[0005] The purpose of the present invention is to provide a micro-spark multi-stage disk electrode grinding device and its use method, which can adopt two working modes: inner circle and outer circle, and simultaneously realize rough processing and fine processing of micro-electrodes through disk electrodes of different widths. Two electrolyte supply methods, namely flushing and immersion, are adopted respectively, which combines the advantages of block electrodes and wire electrodes and solves the problems of low efficiency and difficult control in the preparation process of micro-electrodes.

[0006] To achieve the above object, the present invention provides the following solutions: The present invention provides a micro-spark multi-stage disc electrode grinding device, comprising

[0007] An external cylindrical grinding mechanism, the external cylindrical grinding mechanism comprising a first finishing portion, a roughing portion, a positioning portion, and a first main body portion, the positioning portion being mounted on the first main body portion and used to adjust the relative position of the roughing portion on the first main body portion, the first finishing portion being disposed on the first main body portion; the first finishing portion and the roughing portion being respectively located on either side of a micro-electrode to be machined, the roughing portion and the first finishing portion being respectively used to perform roughing and finishing of external cylindrical grinding on the micro-electrode to be machined;

[0008] The internal cylindrical grinding mechanism includes a second finishing part and a second main body part, the second finishing part is installed on the second main body part, and the second finishing part is used to perform rough and finishing of internal cylindrical grinding on the micro-electrode to be processed under oil bath conditions.

[0009] In one embodiment, the first main body part includes an external cylindrical grinding base plate, which can be used as a liquid storage tank; the positioning part includes a positioning stepper motor, a ball screw, a screw nut, a sliding rail, a screw nut bracket and a slider; the positioning stepper motor is installed on the external cylindrical grinding base plate through a positioning motor seat, and the output end of the positioning stepper motor drives the ball screw to rotate through a coupling, and the screw nut bracket is installed at the screw nut on the ball screw, and the top of the screw nut bracket is fixed to the rough-processing part; the number of the sliders and the sliding rails are both two, and the sliders are fixed on both sides of the bottom surface of the rough-processing part, and the sliders are assembled in the sliding rails.

[0010] In one embodiment, the roughing part includes a roughing platform, a roughing motor, a roughing outer disc-shaped electrode and a roughing shaft; the roughing outer disc-shaped electrode and the roughing shaft are both conductors; the roughing platform is connected to the positioning part through a slider and a screw nut bracket; the roughing motor is installed on the roughing platform through a roughing motor seat, and the output shaft of the roughing motor drives the roughing shaft to rotate through a roughing synchronous belt; the roughing outer disc-shaped electrode is fastened to the roughing shaft through a roughing fastening nut and rotates with the shaft; the roughing outer disc-shaped electrode is used for rough processing of external cylindrical grinding of the micro-electrode to be processed.

[0011] In one embodiment, the first finishing part includes a finishing outer disc electrode, a finishing motor, a finishing platform and a finishing shaft; the finishing outer disc electrode and the finishing shaft are both conductors; the finishing platform is fixed to the outer cylindrical grinding base plate of the first main body part through support studs; the finishing motor is installed on the finishing platform through a finishing motor seat, and the output shaft of the finishing motor drives the finishing shaft to rotate through a finishing synchronous belt, and the finishing outer disc electrode is fastened to the finishing shaft through a finishing fastening nut and rotates with the shaft; the finishing outer disc electrode is used for finishing the outer cylindrical grinding of the micro-electrode to be processed.

[0012] In one embodiment, there is a height difference between the rough-machined outer disc-shaped electrode and the fine-machined outer disc-shaped electrode, and the height of the rough-machined outer disc-shaped electrode is higher than that of the fine-machined outer disc-shaped electrode; when the outer cylindrical grinding method is adopted, the fine electrode to be machined moves vertically downward in the axial direction, and the fine electrode to be machined passes through the rough-machined outer disc-shaped electrode and the fine-machined outer disc-shaped electrode in sequence;

[0013] The edge widths of the rough-machined outer disc-shaped electrode and the fine-machined outer disc-shaped electrode are different; the edge width of the rough-machined outer disc-shaped electrode is greater than the edge width of the fine-machined outer disc-shaped electrode; according to the surface quality requirements of the fine electrode, the rough-machined outer disc-shaped electrode and the fine-machined outer disc-shaped electrode with different edge width specifications can be selected.

[0014] In one embodiment, the rotation speed of the rough-machining outer disc-shaped electrode is coprime with the rotation speed of the fine electrode to be machined, and the rotation speed of the fine-machining outer disc-shaped electrode is also coprime with the rotation speed of the fine electrode to be machined.

[0015] In one embodiment, the second main body portion includes an internal cylindrical grinding base plate, and the second finishing portion includes a roughing inner disc electrode, a disc electrode holder, a finishing inner disc electrode, an oil plug, a finishing motor, a finishing platform and a finishing shaft; the roughing inner disc electrode, the disc electrode holder, the finishing inner disc electrode and the finishing shaft are all conductors; the roughing inner disc electrode is connected to the disc electrode holder via a keyway; the oil plug is threadedly connected to the disc electrode holder, and the finishing inner disc electrode is connected to the disc electrode holder via a keyway; the finishing platform is arranged on the internal cylindrical grinding base plate, the finishing motor is installed on the finishing platform via a finishing motor seat, the output shaft of the finishing motor drives the finishing shaft to rotate via a finishing synchronous belt, and the disc electrode holder is fastened to the finishing shaft via an electrode holder coupling and a fastening nut and rotates with the shaft.

[0016] In one embodiment, when internal grinding is adopted, the rough-machining inner disc-shaped electrode and the fine-machining inner disc-shaped electrode can be stacked and connected to the disc-shaped electrode holder through a keyway; during grinding, the fine electrode to be processed performs circumferential rotation and axial feeding motion, and rough machining is performed when passing through the rough-machining inner disc-shaped electrode, and fine machining is performed when the electrode reaches the fine-machining inner disc-shaped electrode.

[0017] In one embodiment, the rotation speed of the rough-machining inner disk-shaped electrode is coprime with the rotation speed of the fine electrode to be machined, and the rotation speed of the fine-machining inner disk-shaped electrode is also coprime with the rotation speed of the fine electrode to be machined.

[0018] The present invention also provides a method for using a micro-spark multi-stage disc electrode grinding device, which is applied to the above-mentioned micro-spark multi-stage disc electrode grinding device and includes the following steps:

[0019] Step 1: Preparation

[0020] The whole micro-EDM multi-stage disc electrode grinding device is fixed on the working table of the processing machine tool, and the whole device is turned on and is in a processing preparation state;

[0021] Step 2: Workpiece positioning

[0022] The position of the micro-electrode to be processed is moved horizontally, and the initial coordinates are set through contact sensing between the micro-electrode and the fine processing outer disc electrode or the fine processing inner disc electrode;

[0023] Step 3: Positioning the rough machining part

[0024] Adjust the position of the rough machining part according to the size of the fine electrode required for rough machining;

[0025] Step 4: Processing

[0026] The positive electrode of the pulse power supply for electric spark is connected to the fine electrode to be machined, and the negative electrode of the power supply is connected to the roughing outer disc electrode and the fine machining outer disc electrode; the motor parameters of the roughing motor and the fine machining motor are set so that the roughing outer disc electrode and the fine machining outer disc electrode or the disc-shaped electrode holder and the fine machining inner disc electrode rotate circumferentially, and the fine electrode to be machined moves vertically downward while rotating around its own axis, passing through the roughing part and the fine machining part of the external grinding mechanism and the internal grinding mechanism in sequence, thereby achieving roughing and fine machining;

[0027] Step 5: Detection

[0028] Online measurement is used to detect whether the diameter of the micro-electrode meets the requirements. If not, it is re-positioned and processed. If it meets the requirements, the processing is completed.

[0029] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0030] The present invention provides a micro-electric spark multi-stage disk electrode grinding device and a method of using the same, wherein the grinding device portion includes an outer cylindrical grinding mechanism and an inner cylindrical grinding mechanism, which respectively grind the outer and inner circumferences of the disk electrode to grind the micro-electrode, wherein the outer cylindrical grinding mechanism includes a first main body portion, a positioning portion, a rough machining portion and a first fine machining portion, the first main body portion serving as a carrier, the positioning portion, the rough machining portion and the first fine machining portion are all arranged on the first main body portion, the rough machining portion is position-adjusted by the positioning portion, and then the disk electrodes of the rough machining portion and the first fine machining portion perform rough machining and fine machining on the micro-electrode in sequence; the inner cylindrical grinding mechanism includes a second main body portion and a second fine machining portion, the second fine machining portion is arranged on the second main body portion, and then the disk electrodes of the second fine machining portion perform rough machining and fine machining on the micro-electrode in sequence. The present invention adopts two working modes, inner circle and outer circle, and realizes rough processing and fine processing of microelectrodes simultaneously through disk electrodes of different widths. It adopts two electrolyte supply methods, namely flushing and immersion, respectively, combining the advantages of block electrodes and wire electrodes, and solving the problems of low efficiency and difficult control in the preparation process of microelectrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 Schematic diagram of the overall structure of the cylindrical grinding mechanism of the present invention;

[0033] Figure 2 A side view of the cylindrical grinding mechanism with the cylindrical grinding base plate and part of the nut hidden;

[0034] Figure 3 The movement process of the micro-electrode in external cylindrical machining;

[0035] Figure 4 Schematic diagram of the overall structure of the internal grinding mechanism of the present invention;

[0036] Figure 5 It is a side view of the internal grinding mechanism of the present invention;

[0037] Figure 6 is a cross-sectional view of the internal grinding mechanism of the present invention;

[0038] In the figure: 1. External cylindrical grinding base plate; 2. Positioning stepper motor; 3. Positioning motor seat; 4. Coupling; 5. Ball screw fixing seat; 6. Ball screw; 7. Screw nut; 8. Sliding rail; 9. Roughing platform; 10. Roughing motor seat; 11. Roughing motor; 12. Roughing fastening nut; 13 Roughing outer disc electrode; 14. Finishing fastening nut; 15. Finishing outer disc electrode; 16. Finishing electrode Machine; 17. Finishing motor seat; 18. Finishing platform; 19. Screw nut bracket; 20. Slider; 21. Roughing timing belt; 22. Roughing shaft; 23. Finishing shaft; 24. Finishing timing belt; 25. Support stud; 26. Disc electrode holder; 27. Roughing inner disc electrode; 28. Finishing inner disc electrode; 29. ​​Electrode holder coupling; 30. Oil plug; 31. Internal grinding base plate; 32. Bearing. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 efforts are within the scope of protection of the present invention.

[0040] The purpose of the present invention is to provide a micro-spark multi-stage disk electrode grinding device and its use method, which can adopt two working modes: inner circle and outer circle, and simultaneously realize rough processing and fine processing of micro-electrodes through disk electrodes of different widths. Two electrolyte supply methods, namely flushing and immersion, are adopted respectively, which combines the advantages of block electrodes and wire electrodes and solves the problems of low efficiency and difficult control in the preparation process of micro-electrodes.

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] like Figures 1-6 As shown, the present invention provides a micro-electric spark multi-stage disc electrode grinding device, comprising

[0043] The cylindrical grinding mechanism includes a first finishing portion, a roughing portion, a positioning portion, and a first body portion. The positioning portion is mounted on the first body portion, and the positioning portion is used to adjust the relative position of the roughing portion on the first body portion. The first finishing portion is disposed on the first body portion. The first finishing portion and the roughing portion are respectively located on both sides of the micro-electrode to be machined. The roughing portion and the first finishing portion are respectively used for roughing and finishing the cylindrical grinding of the micro-electrode to be machined.

[0044] The internal grinding mechanism includes a second finishing part and a second main body part. The second finishing part is installed on the second main body part and is used for roughing and finishing the internal grinding of the micro-electrode to be processed under oil bath conditions.

[0045] In one embodiment, the first main body portion includes an external cylindrical grinding base plate 1, which can serve as a fluid reservoir. The first main body portion is equipped with a positioning portion, a first fine machining portion, and a rough machining portion, which can collect working fluid. The positioning portion includes a positioning stepper motor 2, a ball screw 6, a screw nut 7, a sliding track 8, a screw nut bracket 19, and a slider 20. The positioning stepper motor 2 is mounted on the external cylindrical grinding base plate 1 via a positioning motor base 3. The output end of the positioning stepper motor 2 drives the ball screw 6 to rotate through a coupling 4, converting the rotation of the ball screw 6 into horizontal movement of the screw nut 7. A screw nut bracket 19 is mounted on the screw nut 7 on the ball screw 6, and the top of the screw nut bracket 19 is fixed to the rough machining portion. There are two sliders 20 and two sliding tracks 8. Sliders 20 are fixed on both sides of the bottom surface of the rough machining portion, and the sliders 20 are assembled in the sliding track 8.

[0046] In one embodiment, the roughing part includes a roughing platform 9, a roughing motor 11, a roughing outer disc electrode 13 and a roughing shaft 22; the roughing outer disc electrode 13 and the roughing shaft 22 are both conductors; the roughing platform 9 is connected to the positioning part through a slider 20 and a screw nut bracket 19; the roughing motor 11 is installed on the roughing platform 9 through a roughing motor seat 10, and the output shaft of the roughing motor 11 drives the roughing shaft 22 to rotate through a roughing synchronous belt 21; the roughing outer disc electrode 13 is fastened to the roughing shaft 22 through a roughing fastening nut 12 and rotates with the shaft; the roughing outer disc electrode 13 is used for rough processing of external cylindrical grinding of the micro-electrode to be machined.

[0047] In one embodiment, the first finishing part includes a finishing outer disc electrode 15, a finishing motor 16, a finishing platform 18 and a finishing shaft 23; the finishing outer disc electrode 15 and the finishing shaft 23 are both conductors; the finishing platform 18 is fixed to the outer cylindrical grinding base plate 1 of the first main body part through a support stud 25; the finishing motor 16 is installed on the finishing platform 18 through a finishing motor seat 17, and the output shaft of the finishing motor 16 drives the finishing shaft 23 to rotate through a finishing synchronous belt 24, and the finishing outer disc electrode 15 is fastened to the finishing shaft 23 through a finishing fastening nut 14 and rotates with the shaft; the finishing outer disc electrode 15 is used for finishing the outer cylindrical grinding of the micro-electrode to be machined.

[0048] like Figure 3As shown in the figure, the movement process of the micro-electrode in external cylindrical machining is marked. The movement direction of the micro-electrode to be machined is marked. The micro-electrode performs circumferential rotation and axial feeding motion. Rough machining is performed when it passes through the rough-machining outer disc-shaped electrode 13, and fine machining is achieved when it feeds to the fine-machining outer disc-shaped electrode 15.

[0049] In one embodiment, there is a height difference between the rough-machined outer disc-shaped electrode 13 and the fine-machined outer disc-shaped electrode 15, and the rough-machined outer disc-shaped electrode 13 is slightly higher than the fine-machined outer disc-shaped electrode 15. When the outer cylindrical grinding method is adopted, the axial vertical downward movement of the fine electrode to be machined is used, and the fine electrode will pass through the rough-machined outer disc-shaped electrode 13 and the fine-machined outer disc-shaped electrode 15 in turn, so that the rough machining and fine machining of the electrode can be achieved at the same time.

[0050] The edge widths of the rough-machining outer disk-shaped electrode 13 and the fine-machining outer disk-shaped electrode 15 are different; the edge thickness of the rough-machining outer disk-shaped electrode 13 is wide, and it rotates counter-rotating with the fine electrode, and is used for more efficient rough machining of the fine electrode; the edge thickness of the fine-machining outer disk-shaped electrode 15 is narrow, and it rotates counter-rotating with the fine electrode to form a discharge process grinding, and is used for fine machining of the fine electrode; different disk-shaped electrodes have different edge widths, and can be matched with each other to achieve different surface quality requirements.

[0051] In one embodiment, the rotation speed of the rough-machining outer disc-shaped electrode 13 is coprime with the rotation speed of the fine electrode to be machined, and the rotation speed of the fine-machining outer disc-shaped electrode 15 is also coprime with the rotation speed of the fine electrode to be machined.

[0052] In one embodiment, the second main body portion includes an internal grinding base plate 31, and the second finishing portion includes a roughing inner disc electrode 27, a disc electrode holder 26, a finishing inner disc electrode 28, an oil plug 30, a finishing motor 16, a finishing platform 18, and a finishing shaft 23; the roughing inner disc electrode 27, the disc electrode holder 26, the finishing inner disc electrode 28, and the finishing shaft 23 are all conductors; the roughing inner disc electrode 27 is connected to the disc electrode holder 26 through a keyway. The oil plug 30 is threadedly connected to the disc electrode holder 26, and the inner disc electrode 28 for finishing is connected to the disc electrode holder 26 through a keyway; the finishing platform 18 is arranged on the inner cylindrical grinding base plate 31, and the finishing motor 16 is installed on the finishing platform 18 through the finishing motor seat 17. The output shaft of the finishing motor 16 drives the finishing shaft 23 to rotate through the finishing synchronous belt 24, and the disc electrode holder 26 is fastened to the finishing shaft 23 through the electrode holder coupling 29 and the fastening nut and rotates with the shaft.

[0053] When internal grinding is adopted, the rough-machining inner disc-shaped electrode 27 and the fine-machining inner disc-shaped electrode 28 can be stacked and connected to the disc-shaped electrode holder 26 through the keyway; during grinding, the fine electrode to be processed is rotated circumferentially and fed axially, and rough machining is performed when passing through the rough-machining inner disc-shaped electrode 27, and fine machining is performed when the electrode reaches the fine-machining inner disc-shaped electrode 28. In this way, the fine electrode can be formed in one step, and rough machining and fine machining can be performed simultaneously.

[0054] In one embodiment, the rotation speed of the rough-machining inner disk-shaped electrode 27 is coprime with the rotation speed of the fine electrode to be machined, and the rotation speed of the fine-machining inner disk-shaped electrode 28 is also coprime with the rotation speed of the fine electrode to be machined.

[0055] In some embodiments, the cylindrical grinding base plate 1 of the first body portion can serve as a fluid reservoir, suitable for use in the wide range of applications where cylindrical grinding involves EDM flushing. During cylindrical machining, the roughing section can be horizontally moved by the positioning portion, adjusting the radial feed rate of the roughing disc electrode and enabling roughing of fine electrodes of varying sizes. During internal grinding, machining can be performed in an oil bath, resulting in a superior surface finish. The disc-shaped electrode holder 26 acts as an oil cup to store the EDM working fluid.

[0056] After each disc electrode is worn, the electrode polarity can be reversed and the original electrode to be processed can be replaced to repair the disc electrode, or the worn disc electrode can be replaced regularly to improve processing efficiency.

[0057] The present invention also provides a method for using a micro-spark multi-stage disc electrode grinding device, which is applied to the above-mentioned micro-spark multi-stage disc electrode grinding device and includes the following steps:

[0058] S1: Preparation: The entire micro-EDM multi-stage disc electrode grinding device is fixed on the workbench of the processing machine tool, and the entire device is turned on and is in a processing preparation state.

[0059] S2: Workpiece positioning: Move the position of the micro-electrode to be processed in the horizontal direction, and set the initial coordinates through the contact sensing between the micro-electrode and the finishing disk-shaped electrode 15 or the finishing inner disk-shaped electrode 28.

[0060] S3: Positioning of the rough machining part: Set the parameters of the positioning stepper motor 2, and the positioning part of the overall micro-EDM multi-stage disc electrode grinding device moves horizontally, and adjust the position of the rough machining part according to the size of the micro electrode required for rough machining.

[0061] S4: Machining: The positive pole of the pulse power supply for electric spark is connected to the micro-electrode to be machined, and the negative pole of the power supply is connected to the rough machining outer disc electrode 13 and the fine machining outer disc electrode 15; the motor parameters of the rough machining motor 11 and the fine machining motor 16 are set so that the rough machining outer disc electrode 13 and the fine machining outer disc electrode 15 or the disc electrode holder 26 and the fine machining inner disc electrode 28 rotate circumferentially, and the micro-electrode to be machined moves vertically downward and rotates around its own axis at the same time, passing through multiple rough machining parts and fine machining parts in turn to realize rough machining and fine machining.

[0062] S5: Detection: Online measurement is performed to detect whether the diameter of the microelectrode meets the requirements. If it does not meet the requirements, the microelectrode needs to repeat the steps of S1-S4 for re-positioning processing. If it meets the requirements, the processing is completed.

[0063] The micro-EDM multi-stage disc electrode grinding device and its use method of the present invention have the following characteristics:

[0064] 1. The present invention uses a rotating disk electrode instead of a block electrode, which is beneficial for the discharge of cutting chips and also helps to overcome the surface quality problem caused by the uneven surface of the block electrode, thereby improving the dimensional accuracy and processing accuracy;

[0065] 2. The present invention uses a rotating disk electrode instead of a wire electrode and utilizes extremely fine edge discharge, thereby reducing the difficulty of servo control, simplifying the processing procedure, and improving processing efficiency.

[0066] 3. The micro-EDM multi-stage disc electrode grinding device of the present invention integrates the rough machining part and the fine machining part, which can realize the integrated micro-electrode machining, greatly improve the working efficiency and reduce the electrode clamping error.

[0067] 4. The micro-EDM multi-stage disc electrode grinding device of the present invention can use disc electrodes with different edge widths to match each other to produce micro-electrodes with different materials, specifications and processing requirements.

[0068] 5. In the micro-EDM multi-stage disc electrode grinding device of the present invention, the rotation speed of the disc electrode is mutually proportional to the rotation speed of the micro-electrode to be machined, thereby avoiding the micro-electrode surface machining quality problems caused by electrode loss of the disc electrode and improving the size and shape accuracy of the machined electrode.

[0069] 6. The outer cylindrical grinding bottom plate of the main body of the micro-EDM multi-stage disc electrode grinding device of the present invention can be used as a liquid storage tank, which can be applied to the working environment of EDM flushing and has a wide range of applications.

[0070] 7. When the micro-EDM multi-stage disc electrode grinding device of the present invention adopts the internal cylindrical grinding method, the disc-shaped electrode holder 26 can be used as an oil cup to store the working fluid of the EDM, so that the EDM discharge process can be carried out in an oil bath environment. The oil bath environment can improve the stability of the discharge process and solve problems such as wire electrode jitter caused by the flushing liquid. According to previous experiments, the roughness Ra of the EDM in the oil bath environment can reach below 0.1. The oil bath environment greatly improves the surface quality of the micro-electrode.

[0071] 8. The size of the present invention is 100*100*300mm, the overall structure volume is small, and it can be directly set on the working platform of the machine tool, and is suitable for accessories of micro-EDM machine tools.

[0072] 9. The present invention utilizes external fluid flushing for rough and fine grinding, making it easy to implement and environmentally friendly for industrial implementation. Internal grinding utilizes an oil bath for rough and fine grinding, improving the surface quality of the processed microelectrode. If the disc electrode, after rough and fine grinding, wears out over time, the electrode polarity can be reversed and replaced with the original electrode to be machined. Alternatively, the worn disc electrode can be repaired or replaced regularly, improving machining efficiency.

[0073] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0074] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A micro-spark multi-stage disc electrode grinding device, characterized by: The invention comprises an external cylindrical grinding mechanism, wherein the external cylindrical grinding mechanism comprises a first finishing part, a roughing part, a positioning part and a first main body part, wherein the positioning part is mounted on the first main body part and is used to adjust the relative position of the roughing part on the first main body part, and the first finishing part is arranged on the first main body part; the first finishing part and the roughing part are respectively located on both sides of the micro-electrode to be machined, and the roughing part and the first finishing part are respectively used to perform roughing and finishing of external cylindrical grinding on the micro-electrode to be machined; an internal cylindrical grinding mechanism, wherein the internal cylindrical grinding mechanism comprises a second finishing part and a second main body part, wherein the second finishing part is mounted on the second main body part, and the second finishing part is used to perform roughing and finishing of internal cylindrical grinding on the micro-electrode to be machined under oil bath conditions; The second main body part includes an internal cylindrical grinding base plate, and the second finishing part includes a roughing inner disc electrode, a disc electrode holder, a finishing inner disc electrode, an oil plug, a finishing motor, a finishing platform and a finishing shaft; the roughing inner disc electrode, the disc electrode holder, the finishing inner disc electrode and the finishing shaft are all conductors; the roughing inner disc electrode is connected to the disc electrode holder through a keyway; the oil plug is threadedly connected to the disc electrode holder, and the finishing inner disc electrode is connected to the disc electrode holder through a keyway; the finishing platform is arranged on the internal cylindrical grinding base plate, the finishing motor is installed on the finishing platform through a finishing motor seat, the output shaft of the finishing motor drives the finishing shaft to rotate through a finishing synchronous belt, and the disc electrode holder is fastened to the finishing shaft through an electrode holder coupling and a fastening nut and rotates with the shaft.

2. The micro-EDM multi-stage disc electrode grinding device according to claim 1, characterized in that: The first main body part includes an external cylindrical grinding base plate, which can be used as a liquid storage tank; the positioning part includes a positioning stepper motor, a ball screw, a screw nut, a sliding rail, a screw nut bracket and a slider; the positioning stepper motor is installed on the external cylindrical grinding base plate through a positioning motor seat, and the output end of the positioning stepper motor drives the ball screw to rotate through a coupling, and the screw nut bracket is installed at the screw nut on the ball screw, and the top of the screw nut bracket is fixed to the rough-processed part; the number of the sliders and the sliding rails are both two, and the sliders are fixed on both sides of the bottom surface of the rough-processed part, and the sliders are assembled in the sliding rails.

3. The micro-EDM multi-stage disc electrode grinding device according to claim 1, characterized in that: The roughing part includes a roughing platform, a roughing motor, a roughing outer disc-shaped electrode and a roughing shaft; the roughing outer disc-shaped electrode and the roughing shaft are both conductors; the roughing platform is connected to the positioning part through a slider and a screw nut bracket; the roughing motor is installed on the roughing platform through a roughing motor seat, and the output shaft of the roughing motor drives the roughing shaft to rotate through a roughing synchronous belt; the roughing outer disc-shaped electrode is fastened to the roughing shaft through a roughing fastening nut and rotates with the shaft; the roughing outer disc-shaped electrode is used for rough processing of external cylindrical grinding of the micro-electrode to be processed.

4. The micro-EDM multi-stage disc electrode grinding device according to claim 3, characterized in that: The first finishing part includes a finishing outer disc-shaped electrode, a finishing motor, a finishing platform and a finishing shaft; the finishing outer disc-shaped electrode and the finishing shaft are both conductors; the finishing platform is fixed to the outer cylindrical grinding base plate of the first main body part through support studs; the finishing motor is installed on the finishing platform through a finishing motor seat, and the output shaft of the finishing motor drives the finishing shaft to rotate through a finishing synchronous belt, and the finishing outer disc-shaped electrode is fastened to the finishing shaft through a finishing fastening nut and rotates with the shaft; the finishing outer disc-shaped electrode is used for finishing the outer cylindrical grinding of the micro-electrode to be processed.

5. The micro-EDM multi-stage disc electrode grinding device according to claim 4, characterized in that: There is a height difference between the rough-machined outer disc-shaped electrode and the fine-machined outer disc-shaped electrode, and the height of the rough-machined outer disc-shaped electrode is higher than that of the fine-machined outer disc-shaped electrode; when the outer cylindrical grinding method is adopted, the fine electrode to be machined moves vertically downward in the axial direction, and the fine electrode to be machined will pass through the rough-machined outer disc-shaped electrode and the fine-machined outer disc-shaped electrode in turn; the edge widths of the rough-machined outer disc-shaped electrode and the fine-machined outer disc-shaped electrode are different; the edge width of the rough-machined outer disc-shaped electrode is greater than the edge width of the fine-machined outer disc-shaped electrode; according to the surface quality requirements of the fine electrode, the rough-machined outer disc-shaped electrode and the fine-machined outer disc-shaped electrode with different edge width specifications can be selected.

6. The micro-EDM multi-stage disc electrode grinding device according to claim 4, characterized in that: The rotation speed of the rough-machining outer disc-shaped electrode is mutually prime to the rotation speed of the fine electrode to be machined, and the rotation speed of the fine-machining outer disc-shaped electrode is also mutually prime to the rotation speed of the fine electrode to be machined.

7. The micro-EDM multi-stage disc electrode grinding device according to claim 1, characterized in that: When internal grinding is adopted, the rough-machining inner disc-shaped electrode and the fine-machining inner disc-shaped electrode can be stacked and connected to the disc-shaped electrode holder through a keyway; during grinding, the fine electrode to be processed performs circumferential rotation and axial feeding motion, and rough machining is performed when passing through the rough-machining inner disc-shaped electrode, and fine machining is performed when the electrode reaches the fine-machining inner disc-shaped electrode.

8. The micro-EDM multi-stage disc electrode grinding device according to claim 1, characterized in that: The rotation speed of the rough-machining inner disk-shaped electrode is mutually prime to the rotation speed of the fine electrode to be machined, and the rotation speed of the fine-machining inner disk-shaped electrode is also mutually prime to the rotation speed of the fine electrode to be machined.

9. A method for using a micro-spark multi-stage disc electrode grinding device, applied to the micro-spark multi-stage disc electrode grinding device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Preparation The whole micro-EDM multi-stage disc electrode grinding device is fixed on the working table of the processing machine tool, and the whole device is turned on and is in a processing preparation state; Step 2: Workpiece positioning The position of the micro-electrode to be processed is moved horizontally, and the initial coordinates are set through contact sensing between the micro-electrode and the fine processing outer disc electrode or the fine processing inner disc electrode; Step 3: Positioning the rough machining part Adjust the position of the rough machining part according to the size of the fine electrode required for rough machining; Step 4: Processing The positive electrode of the pulse power supply for electric spark is connected to the fine electrode to be machined, and the negative electrode of the power supply is connected to the roughing outer disc electrode and the fine machining outer disc electrode; the motor parameters of the roughing motor and the fine machining motor are set so that the roughing outer disc electrode and the fine machining outer disc electrode or the disc-shaped electrode holder and the fine machining inner disc electrode rotate circumferentially, and the fine electrode to be machined moves vertically downward while rotating around its own axis, passing through the roughing part and the fine machining part of the external grinding mechanism and the internal grinding mechanism in sequence, thereby achieving roughing and fine machining; Step 5: Detection Online measurement is used to detect whether the diameter of the micro-electrode meets the requirements. If not, it is re-positioned and processed. If it meets the requirements, the processing is completed.

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