Stacked electrode, electric spark device, working fluid, and electric spark device control method

Abstract

This application relates to the field of electrical discharge machining (EDM) equipment technology, and provides a multilayer electrode, an EDM device, a working fluid, and an EDM device control method. The multilayer electrode includes multiple electrode foils and multiple insulating portions. The multiple electrode foils are spaced apart along the thickness direction of the electrode foils, and the multiple insulating portions are correspondingly disposed between two adjacent electrode foils. The two opposite sidewalls of the insulating portions respectively abut against the two adjacent electrode foils, and the polarities of the two adjacent electrode foils are opposite. The multilayer electrode provided by this application can perform spark discharge on the sidewalls in the thickness direction, thereby enabling the multilayer electrode provided by this application to process non-conductive workpieces.

Description

Technical Field

[0001] This application belongs to the technical field of electrical discharge machining equipment, and more specifically, relates to a multilayer electrode, an electrical discharge machine, a working fluid, and a control method for the electrical discharge machine. Background Technology

[0002] Electrical discharge machining (EDM) is a new machining process that utilizes electrical and thermal energy, and is commonly used to manufacture and process various high-hardness, high-precision parts. Its principle is based on the discharge phenomenon between the tool electrode and the workpiece electrode, forming an electric spark between the two electrodes, thereby machining the workpiece.

[0003] However, existing electrical discharge machining (EDM) equipment can only process conductive materials in principle and cannot process non-conductive materials. Summary of the Invention

[0004] The purpose of this application is to provide a multilayer electrode, an electrical discharge machining (EDM) device, a working fluid, and an EDM device control method, in order to solve the technical problem that existing EDM devices cannot process non-conductive materials.

[0005] To achieve the above objectives, according to one aspect of this application, a stacked electrode is provided for electrical discharge machining of non-conductive materials. The stacked electrode includes: a plurality of electrode foils and a plurality of insulating portions. The plurality of electrode foils are spaced apart along the thickness direction of the electrode foils. The plurality of insulating portions are disposed one-to-one between two adjacent electrode foils. The two opposite sidewalls of the insulating portions abut against two adjacent electrode foils respectively to separate the two adjacent electrode foils. The polarities of the two adjacent electrode foils are opposite.

[0006] Optionally, the stacked electrode has a clamping end and a forming end. An external clamping device can clamp the stacked electrode through the clamping end. When the forming end is immersed in a preset working fluid, two adjacent electrode foils can perform spark discharge on the forming end.

[0007] Optionally, the electrode foil is provided with a power connection structure for connecting to an external pulse power supply. The power connection structures on two adjacent electrode foils are located on opposite sides of the stacked electrode.

[0008] According to another aspect of this application, an electrical discharge machining (EDM) device is provided for performing EDM on workpieces made of non-conductive materials. The EDM device includes a pulse power supply device and a stacked electrode, wherein the stacked electrode is the aforementioned stacked electrode. The pulse power supply device is used to provide pulse power to the stacked electrode so that the stacked electrode can perform EDM on workpieces made of non-conductive materials immersed in a preset working fluid.

[0009] Optionally, the EDM equipment also includes a frame, a feeding device, and a clamping device. The feeding device is mounted on the frame, and the clamping device is mounted on the output end of the feeding device for clamping the stacked electrodes. The clamping device can move towards the non-conductive workpiece under the drive of the feeding device.

[0010] Optionally, the EDM equipment also includes a working fluid tank, which is mounted on the frame and corresponds to the position of the feed device, for containing a preset working fluid and a non-conductive workpiece.

[0011] Optionally, the EDM equipment also includes a workpiece mounting device, which is set in a working fluid tank for fixing and mounting non-conductive workpieces. The preset working fluid in the working fluid tank can immerse the non-conductive workpieces on the workpiece mounting device.

[0012] Optionally, the EDM equipment also includes a liquid driving device, which is disposed in the working fluid tank and is used to drive the preset working fluid in the working fluid tank so that the preset working fluid flows in the working fluid tank.

[0013] According to another aspect of this application, a working fluid is provided for spark discharge at the forming end of a stacked electrode. Optionally, the working fluid includes an insulating liquid medium and conductive particles, wherein the conductive particles are mixed in the insulating liquid medium, and the specific gravity of the conductive particles is greater than that of the insulating liquid medium. Two adjacent electrode foils having opposite polarity can perform spark discharge under the bridging of the conductive particles. The working fluid is the aforementioned preset working fluid.

[0014] According to another aspect of this application, an electrical discharge machining (EDM) equipment control method is provided. The EDM equipment control method is applied to the aforementioned EDM equipment. The EDM equipment control method includes: supplying power to the stacked electrodes through a pulse power supply device so that two adjacent electrode foils have opposite power polarities; performing EDM processing on a non-conductive workpiece immersed in a preset working fluid through the stacked electrodes, and periodically changing the power polarities of the two adjacent electrode foils.

[0015] The beneficial effects of the stacked electrode provided in this application are as follows: Compared with the prior art, the stacked electrode provided in this application arranges multiple electrode foils at intervals along the thickness direction of the electrode foils, and arranges multiple insulating portions one-to-one between two adjacent electrode foils. At the same time, the two opposite sidewalls of the insulating portions abut against the two adjacent electrode foils respectively, so that the two adjacent electrode foils can be separated by the insulating portions, thereby avoiding spark discharge between the two adjacent electrode foils and their close sidewalls. Meanwhile, by setting the polarity of the two adjacent electrode foils to opposite and separating the two adjacent electrode foils by the insulating portions, the stacked electrode provided in this application can perform spark discharge on the sidewalls in the thickness direction, thereby enabling the stacked electrode provided in this application to process non-conductive workpieces. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the stacked electrode provided in the embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the structure of the stacked electrode from another perspective, as provided in the embodiments of this application.

[0019] Figure 3 This is a schematic diagram of the structure of a non-conductive workpiece after processing, provided in an embodiment of this application.

[0020] Figure 4 This is a control flowchart of an electrical discharge device provided in an embodiment of this application;

[0021] The details of the reference numerals used in the above figures are as follows:

[0022] 10. Workpieces made of non-conductive materials; 11. Cavities;

[0023] 20. Electrode foil; 21. Electrical connection structure;

[0024] 30. Insulating film;

[0025] 40. Clamping end;

[0026] 50. Forming end; 51. Preset forming structure; 52. Electrode working surface. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to that other element. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] As described in the background section, electrical discharge machining (EDM) is a novel machining process that utilizes electrical and thermal energy, commonly used to manufacture and process various high-hardness, high-precision parts. Its principle involves using the discharge phenomenon between the tool electrode and the workpiece electrode to create an electric spark, thereby machining the workpiece. However, existing EDM equipment, in principle, can only process conductive materials and cannot process non-conductive materials.

[0032] See Figures 1 to 4As shown, in order to solve the above problems, according to one aspect of this application, an embodiment of this application provides a stacked electrode for performing electrical discharge machining on a non-conductive workpiece 10. The stacked electrode includes: a plurality of electrode foils 20 and a plurality of insulating portions. The plurality of electrode foils 20 are spaced apart along the thickness direction of the electrode foils 20. The plurality of insulating portions are disposed one-to-one between two adjacent electrode foils 20. The two opposite sidewalls of the insulating portions abut against the two adjacent electrode foils 20 respectively. The polarities of the two adjacent electrode foils 20 are opposite. The stacked electrode provided in this embodiment arranges multiple electrode foils 20 at intervals along the thickness direction of the electrode foils 20, and arranges multiple insulating portions one-to-one between adjacent electrode foils 20. At the same time, the two opposite sidewalls of the insulating portions abut against the two adjacent electrode foils 20, so that the two adjacent electrode foils 20 can be separated by the insulating portions, thereby preventing spark discharge between the two adjacent electrode foils 20 and their close sidewalls. Meanwhile, by setting the polarity of the two adjacent electrode foils 20 to opposite and separating the two adjacent electrode foils 20 by the insulating portions, the stacked electrode provided in this embodiment can perform spark discharge on the sidewalls in the thickness direction, thereby enabling the stacked electrode provided in this embodiment to process non-conductive workpieces 10.

[0033] In one optional embodiment, the material of the non-conductive workpiece 10 provided in this embodiment is glass. Of course, in other embodiments, the material of the non-conductive workpiece 10 provided in this embodiment can also be non-conductive materials such as ceramics.

[0034] In one optional embodiment, the electrode foil 20 provided in this embodiment is made of copper and its alloys. Of course, in other embodiments, the electrode foil 20 provided in this embodiment can also be made of tungsten and its alloys, nickel and its alloys, molybdenum and its alloys, graphite, etc.

[0035] In one alternative embodiment, the electrode foil 20 provided in this embodiment has a thickness of less than 100 micrometers.

[0036] In one optional embodiment, the electrode foil 20 provided in this embodiment is a beryllium copper foil with a thickness of 40 micrometers.

[0037] See Figure 1 and Figure 2As shown, in a specific embodiment, during the spark discharge process, the discharge loss of the two adjacent ends of the two adjacent electrode foils 20 in the thickness direction is greater than the discharge loss of the two adjacent ends of the two electrode foils 20 in the thickness direction. Therefore, when the thickness of the electrode foil 20 is greater than or equal to 100 micrometers, the end face of the stacked electrode in the thickness direction may exhibit uneven discharge loss, thereby affecting the processing quality of the non-conductive workpiece 10 by the stacked electrode.

[0038] See Figure 1 and Figure 2 As shown, in a specific embodiment, the stacked electrode in this embodiment has a clamping end 40 and a forming end 50. An external clamping device can clamp the stacked electrode through the clamping end 40. When the forming end 50 is immersed in a preset working solution, two adjacent electrode foils 20 can perform spark discharge on the forming end 50.

[0039] In an optional embodiment, the forming end 50 of the stacked electrode provided in this embodiment is provided with an electrode working surface 52. The electrode working surface 52 can contact the non-conductive material workpiece 10 in the preset working fluid and perform spark discharge to realize the electrical discharge machining of the non-conductive material workpiece 10.

[0040] In one optional embodiment, the forming end 50 of the stacked electrode provided in this embodiment is provided with a preset forming structure 51. The stacked electrode provided in this embodiment can process a cavity 11 of a preset shape on a non-conductive workpiece 10 through the preset forming structure 51.

[0041] In one specific embodiment, the preset working fluid provided in this embodiment includes an insulating liquid medium and conductive particles. The conductive particles are mixed in the insulating liquid medium, and the specific gravity of the conductive particles is greater than that of the insulating liquid medium. After being energized, two adjacent electrode foils 20 with opposite polarities can perform spark discharge under the bridging of the conductive particles.

[0042] See Figure 1 and Figure 2As shown, to facilitate the connection of the electrode foil 20 provided in this embodiment, a connection structure 21 is provided on the electrode foil 20. The connection structure 21 is used to connect to an external pulse power supply. The connection structures 21 on two adjacent electrode foils 20 are respectively located on opposite sides of the stacked electrode. By providing the connection structure 21 on the electrode foil 20 provided in this embodiment, the electrode foil 20 can be electrically connected to the external pulse power supply through the connection structure 21. At the same time, since the connection polarities of two adjacent electrode foils 20 are opposite, by setting the connection structures 21 on two adjacent electrode foils 20 to be respectively located on opposite sides of the stacked electrode, the connection of the electrode foil 20 provided in this embodiment can be facilitated.

[0043] In one specific embodiment, two electrical connection structures 21 on two adjacent electrode foils 20 are respectively connected to the two poles of an external pulse power supply.

[0044] In one specific embodiment, the insulating part provided in this embodiment includes at least one insulating film 30. When there is only one insulating film 30, the two opposite sidewalls of the insulating film 30 abut against two adjacent electrode foils 20 respectively to separate the two adjacent electrode foils 20. When there are multiple insulating films 30, the multiple insulating films 30 are stacked along the thickness direction of the insulating film 30, and the mutually distant sidewalls of the two insulating films 30 located at the ends can abut against two adjacent electrode foils 20 respectively.

[0045] In one optional embodiment, the insulating film 30 provided in this embodiment is a plastic tape.

[0046] In one optional embodiment, the thickness of the insulating film 30 provided in this embodiment is 15 to 45 micrometers.

[0047] In one optional embodiment, the insulating film 30 provided in this embodiment is a single-sided plastic tape with a thickness of 25 micrometers.

[0048] In one specific embodiment, when the thickness of the insulating film 30 provided in this embodiment is less than 15 micrometers, a breakdown short circuit may occur between two adjacent electrode foils 20; when the thickness of the insulating film 30 provided in this embodiment is greater than 45 micrometers, a phenomenon that cannot produce normal spark discharge may occur between adjacent electrode foils 20.

[0049] In one optional embodiment, the stacked electrode provided in this embodiment is composed of beryllium copper foil and single-sided plastic tape. When processing the stacked electrode provided in this embodiment, firstly, according to the shape and size requirements of the three-dimensional microcavity to be processed, a corresponding electrical discharge machining (EDM) microstructure electrode needs to be designed. Then, the microstructure electrode design model is discretized into a sheet-like model of alternatingly stacked electrode foil 20 and insulating film 30. Next, according to the sheet-like model, single-sided plastic tape is sequentially pasted onto one side of the beryllium copper foil, and the beryllium copper foil with the pasted single-sided plastic tape is stacked to form a stacked electrode blank. After the beryllium copper foil with the pasted single-sided plastic tape is stacked, the stacked electrode blank and the stacked electrode can be... One end of the electrode clamping end 40 is clamped to prevent misalignment between the layers of the stacked electrode blank. After clamping the stacked electrode blank, the beryllium copper foil with single-sided plastic tape is sequentially wire-cut according to the contour data of each layer in the sheet model. While the beryllium copper foil obtains a two-dimensional microstructure, the single-sided tape on its surface also obtains the same two-dimensional microstructure due to the discharge spark. Before cutting each layer of electrode foil 20, the remaining electrode foils 20 need to be bent up or down to avoid the wire cutting electrode wire. After all the electrode foils 20 are sequentially wire-cut, the two-dimensional microstructures of each layer can be stacked and fitted to form a three-dimensional microstructure, and the processing of the stacked electrode is completed.

[0050] In an optional embodiment, when using the stacked electrode provided in this embodiment to perform electrical discharge machining on a non-conductive workpiece 10, the entire stacked electrode must be firmly clamped, with only the electrode working surface 52 of the stacked electrode exposed.

[0051] According to another aspect of this application, an electrical discharge machining (EDM) device is provided for performing EDM on a non-conductive workpiece 10. The EDM device in this embodiment includes a pulse power supply device and a stacked electrode. The stacked electrode is the aforementioned stacked electrode. The pulse power supply device is used to provide pulse power to the stacked electrode so that the stacked electrode can perform EDM on the non-conductive workpiece 10 immersed in a preset working fluid.

[0052] In one specific embodiment, the EDM equipment further includes a frame, a feeding device, and a clamping device. The feeding device is mounted on the frame, and the clamping device is mounted on the output end of the feeding device for clamping the multilayer electrode. The clamping device can move towards the non-conductive workpiece 10 under the drive of the feeding device. By providing a clamping device on the output end of the feeding device provided in this embodiment, the EDM equipment provided in this embodiment can clamp the multilayer electrode through the clamping device. At the same time, by providing the clamping device on the output end of the feeding device, the clamping device provided in this embodiment can move towards or away from the non-conductive workpiece 10 under the drive of the feeding device, thereby allowing the position of the multilayer electrode clamped on the clamping device to be adjusted in the direction of approaching or moving away from the non-conductive workpiece 10.

[0053] In one optional embodiment, the pulse power supply device provided in this embodiment is mounted on a rack. By mounting the pulse power supply device provided in this embodiment, the electrical discharge equipment provided in this embodiment can supply pulse power to the stacked electrodes.

[0054] In one specific embodiment, the electrical discharge machining (EDM) equipment further includes a working fluid tank, which is mounted on a frame and corresponds to the position of the feed device. The working fluid tank is used to contain a preset working fluid and a non-conductive workpiece 10. By mounting the working fluid tank on the frame and aligning its position with the feed device, the stacked electrode provided in this embodiment can, under the influence of the feed device, immerse its electrode working surface 52 in the preset working fluid within the working fluid tank, and abut against the non-conductive workpiece 10 within the working fluid tank. This allows the stacked electrode to perform EDM on the non-conductive workpiece 10.

[0055] In one specific embodiment, to fix the non-conductive workpiece 10 provided in this embodiment, the EDM equipment in this embodiment further includes a workpiece mounting device. The workpiece mounting device is disposed in a working fluid tank and is used to fix the non-conductive workpiece 10. The preset working fluid in the working fluid tank can immerse the non-conductive workpiece 10 on the workpiece mounting device. By setting the workpiece mounting device in the working fluid tank provided in this embodiment, the EDM equipment provided in this embodiment can fix the non-conductive workpiece 10 through the workpiece mounting device. At the same time, by setting the preset working fluid in the working fluid tank to be able to immerse the non-conductive workpiece 10 on the workpiece mounting device, the working surface of the stacked electrode provided in this embodiment can perform spark discharge under the bridging of the preset working fluid, thereby realizing the EDM machining of the non-conductive workpiece 10.

[0056] In one optional embodiment, the workpiece mounting device provided in this embodiment is a worktable. The specific structure of the worktable is a conventional technical means in the prior art, and will not be described in detail here.

[0057] In one optional embodiment, the workpiece mounting device provided in this embodiment is located at the bottom of the working fluid tank.

[0058] In one specific embodiment, the EDM device further includes a liquid driving device disposed within a working fluid tank. This liquid driving device drives a preset working fluid within the working fluid tank, causing the preset working fluid to flow within the tank. By providing a liquid driving device within the working fluid tank in this embodiment, the preset working fluid can flow within the tank under the drive of the liquid driving device, thereby ensuring sufficient contact between the preset working fluid and the stacked electrodes.

[0059] In one optional embodiment, the liquid drive device provided in this embodiment is an oil pump.

[0060] In one optional embodiment, the pulse power supply device provided in this embodiment has a processing open-circuit voltage of 100V, a pulse length of 30 microseconds, a pulse interval of 30 microseconds, and the positive and negative polarities are reversed in each pulse cycle.

[0061] In one specific embodiment, according to another aspect of this application, a working fluid is provided for spark discharge at the forming end 50 of a stacked electrode. In this embodiment, the working fluid includes an insulating liquid medium and conductive particles. The conductive particles are mixed in the insulating liquid medium, and the specific gravity of the conductive particles is greater than that of the insulating liquid medium. Two adjacent electrode foils 20 with opposite polarity can perform spark discharge under the bridging of the conductive particles. The working fluid is the aforementioned preset working fluid.

[0062] In one specific embodiment, the specific gravity mentioned above is also called relative density. The specific gravity of a solid or liquid is the ratio of the density of the substance (in a completely dense state) to the density of pure H2O at standard atmospheric pressure and temperature of 3.98°C (999.972 kg / m3). The specific gravity of a liquid or solid indicates whether it sinks or floats in another fluid. The working fluid provided in this embodiment sets the specific gravity of the conductive particles to be greater than that of the insulating liquid medium, so that the conductive particles provided in this embodiment can sink in the insulating liquid medium.

[0063] In one specific embodiment, the bridging of conductive particles in the above embodiment refers to the ability of two adjacent electrode foils 20 to transmit electrical energy through conductive particles located near the two adjacent electrode foils 20 as a medium for electrical energy transmission.

[0064] In one optional embodiment, the insulating liquid medium provided in this embodiment is spark oil. Of course, in other embodiments, the insulating liquid medium provided in this embodiment can also be kerosene, pure water, or other insulating liquids.

[0065] In one optional embodiment, the conductive particles provided in this embodiment are copper powder with an average diameter of 1 micrometer.

[0066] In one optional embodiment, the copper powder content in the working fluid provided in this embodiment is 5 g / L.

[0067] See Figures 1 to 4 As shown, according to another aspect of this application, an electrical discharge machining (EDM) equipment control method is provided. The EDM equipment control method is applied to the aforementioned EDM equipment. The EDM equipment control method includes: S101, supplying power to the stacked electrodes through a pulse power supply device so that two adjacent electrode foils 20 have opposite power polarities; S103, performing EDM processing on a non-conductive workpiece 10 immersed in a preset working fluid through the stacked electrodes, and periodically changing the power polarities of two adjacent electrode foils 20.

[0068] In one specific embodiment, since the discharge loss of electrode foils 20 with different power polarities is different, by periodically changing the power polarity of two adjacent electrode foils 20, the wear degree of the two adjacent electrode foils 20 can be kept consistent, thereby improving the service life of the stacked electrode provided in this embodiment.

[0069] In one specific embodiment, when performing electrical discharge machining (EDM) on a non-conductive workpiece 10 using the EDM equipment provided in this embodiment, the non-conductive workpiece 10 is first fixedly installed in a working fluid tank using a workpiece mounting device. Then, the working fluid in the tank is used to immerse the non-conductive workpiece 10. Next, a liquid driving device drives the working fluid in the tank, causing it to flow. Because the specific gravity of conductive particles in the working fluid is greater than that of the insulating liquid medium, the conductive particles in the flowing working fluid can be deposited towards the bottom of the working fluid tank in real time under the influence of gravity. Since the working fluid is flowing, the conductive particles will not deposit on the surface of the non-conductive workpiece 10, but the closer to the non-conductive workpiece 10... On the surface, the content of conductive particles increases sharply, providing favorable conditions for spark discharge of the multilayer electrode. After the working fluid flows, the multilayer electrode can be clamped by the clamping device, and the clamping device can be driven by the feeding device to make the electrode working surface 52 of the multilayer electrode on the clamping device have a preset distance with the non-conductive workpiece 10. At this time, the multilayer electrode can be powered by the pulse power supply device. Since the content of conductive particles near the surface of the non-conductive workpiece 10 is high, the multilayer electrode with pulse power can perform spark discharge under the bridging of conductive particles. The strong discharge energy generated by the spark discharge can erode the material on the non-conductive workpiece 10 to realize the electrical discharge machining of the non-conductive workpiece 10.

[0070] In one specific embodiment, the stacked electrode provided in this embodiment needs to use conductive particles for bridging during spark discharge. However, the heat generated during spark discharge of the stacked electrode causes some of the insulating liquid medium and conductive particles to vaporize, resulting in a sudden increase in volume and forming bubbles in the discharge gap. This causes the conductive particles near the electrode working surface 52 of the stacked electrode to be pushed away. At this time, the flowing working fluid can replenish the conductive particles near the electrode working surface 52 of the stacked electrode in real time, so that the stacked electrode can work in real time.

[0071] In one specific embodiment, the discharge gap between two adjacent electrode foils 20 provided in this embodiment is approximately 10 micrometers. The size of the discharge gap varies depending on the electrode material, working fluid, and electrical parameters. The distance between two adjacent electrode foils 20 provided in this embodiment is 15 to 45 micrometers. Therefore, under normal circumstances, the stacked electrode provided in this embodiment will not perform spark discharge after being energized. However, when the stacked electrode of the pulse power supply device is located near the non-conductive workpiece 10, due to the high content of conductive particles near the surface of the non-conductive workpiece 10, the two adjacent electrode foils 20 can be bridged by the conductive particles, causing the discharge gap between the two adjacent electrode foils 20 to expand to between 15 and 45 micrometers, thereby causing spark discharge between the two adjacent electrode foils 20.

[0072] In one specific embodiment, when using the EDM equipment provided in this embodiment to perform micro-cavity processing on a non-conductive workpiece 10, the stacked electrode will gradually wear down over time, and the material on the non-conductive workpiece 10 will also be gradually eroded away, resulting in a gradual increase in the distance between the stacked electrode and the non-conductive workpiece 10. When the distance between the stacked electrode and the non-conductive workpiece 10 reaches a certain distance, the number of conductive particles near the stacked electrode will decrease significantly. When the number of conductive particles can no longer bridge and induce spark discharge between adjacent electrode foils 20, the stacked electrode will stop working. At this time, the clamping device can be driven by the feeding device to move the stacked electrode closer to the non-conductive workpiece 10. When the stacked electrode approaches the non-conductive workpiece 10 again, the stacked electrode will continue to perform EDM processing. This process is repeated until the micro-cavity forming processing of the non-conductive workpiece 10 is completed.

[0073] In summary, implementing the stacked electrode, EDM equipment, working fluid, and EDM equipment control method provided in this embodiment has at least the following beneficial technical effects: The stacked electrode provided in this embodiment, by arranging multiple electrode foils 20 at intervals along the thickness direction of the electrode foils 20, and by arranging multiple insulating portions one-to-one between adjacent electrode foils 20, and by having two opposite sidewalls of the insulating portions respectively abut against the two adjacent electrode foils 20, allows the two adjacent electrode foils 20 to be separated by the insulating portions, thereby preventing spark discharge between the two adjacent electrode foils 20 and their adjacent sidewalls. At the same time, by setting the polarity of the two adjacent electrode foils 20 to opposite and separating the two adjacent electrode foils 20 by the insulating portions, the stacked electrode provided in this embodiment can perform spark discharge on the sidewalls in the thickness direction, thereby enabling the stacked electrode provided in this embodiment to process non-conductive workpieces 10.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control method for an electrical discharge machining (EDM) device, applied to an EDM device for EDM machining of a non-conductive workpiece (10), characterized in that, The electrical discharge machining (EDM) equipment includes a pulse power supply device and a stacked electrode. The stacked electrode is used to perform EDM on a non-conductive workpiece (10). The stacked electrode includes multiple electrode foils (20) and multiple insulating portions. The multiple electrode foils (20) are spaced apart along the thickness direction of the electrode foils (20). The multiple insulating portions are arranged one-to-one between two adjacent electrode foils (20). The two opposite sidewalls of the insulating portions abut against two adjacent electrode foils (20) to separate the two adjacent electrode foils (20). The polarities of the two adjacent electrode foils (20) are opposite. The pulse power supply device is used to provide pulse power to the stacked electrode so that the stacked electrode can perform EDM on the non-conductive workpiece (10) immersed in a preset working fluid. The EDM equipment control method includes: The stacked electrodes are powered by the pulse power supply device so that two adjacent electrode foils (20) have opposite power polarities; The non-conductive workpiece (10) immersed in the preset working fluid is subjected to electrical discharge machining by the stacked electrodes, and the power polarity of two adjacent electrode foils (20) is periodically changed; wherein, the working fluid includes an insulating liquid medium and conductive particles, the conductive particles are mixed in the insulating liquid medium, the specific gravity of the conductive particles is greater than that of the insulating liquid medium, and two adjacent electrode foils (20) with opposite polarities can perform spark discharge under the bridging of the conductive particles.

2. The electrical discharge machining (EDM) equipment control method according to claim 1, characterized in that, The stacked electrode has a clamping end (40) and a forming end (50). An external clamping device can clamp the stacked electrode through the clamping end (40). When the forming end (50) is immersed in the working fluid, two adjacent electrode foils (20) can perform spark discharge on the forming end (50).

3. The electrical discharge machining (EDM) equipment control method according to claim 2, characterized in that, The electrode foil (20) is provided with a power connection structure (21), which is used to connect to an external pulse power supply. The power connection structures (21) on two adjacent electrode foils (20) are located on opposite sides of the stacked electrode.

4. The electrical discharge machining (EDM) equipment control method according to claim 1, characterized in that, The EDM equipment also includes a frame, a feeding device and a clamping device. The feeding device is mounted on the frame, and the clamping device is mounted on the output end of the feeding device for clamping the stacked electrodes. The clamping device can move towards or away from the non-conductive workpiece (10) under the drive of the feeding device.

5. The electrical discharge machining (EDM) equipment control method according to claim 4, characterized in that, The EDM equipment also includes a working fluid tank, which is disposed on the frame and corresponds to the position of the feeding device, for accommodating the preset working fluid and the non-conductive workpiece (10).

6. The electrical discharge machining (EDM) equipment control method according to claim 5, characterized in that, The EDM equipment also includes a workpiece mounting device, which is set in the working fluid tank for fixing the non-conductive workpiece (10). The preset working fluid in the working fluid tank can immerse the non-conductive workpiece (10) on the workpiece mounting device.

7. The electrical discharge machining (EDM) equipment control method according to claim 6, characterized in that, The EDM equipment also includes a liquid driving device, which is disposed in the working fluid tank and is used to drive the preset working fluid in the working fluid tank so that the preset working fluid flows in the working fluid tank.

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