Electrical discharge machining method and electrical discharge machining device

Abstract

The application belongs to the technical field of electric spark machining, and discloses an electric spark machining method and an electric spark machining device. The electric spark machining method comprises the following steps: dividing a workpiece to be machined into a plurality of spliced and connected machining areas, and disassembling an electric spark electrode into a plurality of independent electrode modules, the plurality of electrode modules correspond to the plurality of machining areas one by one, and each electrode module processes a corresponding machining area; the plurality of electrode modules sequentially process the corresponding machining areas until the machining of each machining area is completed. The electric spark machining method provided by the application reduces the discharge area of each electrode module on the machining area in the machining process by sequentially processing the corresponding machining area by the plurality of electrode modules, avoids a large instantaneous fluid negative pressure generated by each electrode module when the electrode is lifted, ensures that the working fluid fully penetrates and infiltrates the machining area in the machining process, avoids damaging the workpiece to be machined, and ensures the machining quality.

Description

Technical Field

[0001] This invention relates to the field of electrical discharge machining (EDM) technology, and more particularly to an EDM method and an EDM apparatus. Background Technology

[0002] In related technologies, when machining large-area hard and brittle material workpieces using electrical discharge electrodes (EDE), the large discharge area of ​​the EDE during machining—meaning a large area between the EDE and the workpiece—makes it difficult for the working fluid to penetrate to the central region or micro-dead corners of the discharge gap. This results in insufficient wetting of the machining area of ​​the hard and brittle material workpiece by the working fluid. Poor wetting can easily lead to insufficient cooling of the discharge area, and the erosion products (carbon deposits) generated during machining cannot be discharged with the working fluid, easily causing short circuits, arcing, or carbon buildup. Ultimately, this can cause the EDE to stop discharging and result in hard extrusion, damaging the hard and brittle material workpiece. Furthermore, because hard and brittle material workpieces are prone to brittle fracture under external forces, when machining large-area hard and brittle material workpieces using EDE, a very strong instantaneous fluid negative pressure (i.e., vacuum adsorption effect) is generated between the EDE and the hard and brittle material workpiece during the tool retraction. This fluid negative pressure can easily tear apart the micro-array structure machined on the surface of the hard and brittle material workpiece.

[0003] Therefore, there is an urgent need for an electrical discharge machining method and an electrical discharge machining apparatus to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an electrical discharge machining method and an electrical discharge machining apparatus to reduce the discharge area of ​​each electrode module in the area to be machined during the machining process, avoid generating a large instantaneous fluid negative pressure when each electrode module is lifted, ensure that the working fluid fully penetrates and wets the area to be machined during the machining process, avoid damage to the workpiece, and ensure machining quality.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electrical discharge machining method includes the following steps:

[0007] The workpiece to be processed is divided into multiple interconnected processing areas, and the electrical discharge electrode is disassembled into multiple independent electrode modules. Each of the multiple electrode modules corresponds to one of the multiple processing areas, and each electrode module processes the corresponding processing area.

[0008] Multiple electrode modules sequentially process the corresponding areas to be processed until the processing of each area to be processed is completed.

[0009] As an optional solution, during the processing of the corresponding processing area of ​​each electrode module, it is necessary to periodically lift the electrode module.

[0010] When the processing depth of the electrode module on the area to be processed is less than the preset depth, the electrode module lifts the tool in two stages, including the following steps:

[0011] The electrode module is raised at a constant speed of a first speed V1. When the electrode module is raised to a preset height at a constant speed of the first speed V1, the electrode module is raised at a constant speed of a second speed V2 until the electrode module reaches the standby position.

[0012] Wherein, the second speed V2 is greater than the first speed V1.

[0013] As an optional option, the preset height is 0.4mm to 1mm.

[0014] As an optional solution, when the processing depth of the electrode module on the area to be processed is not less than the preset depth, the electrode module lifts the tool in multiple segments, and the lifting speed of each segment is greater than the lifting speed of the previous segment. Furthermore, the electrode module lifts the tool in advance at a third speed V3, and the third speed V3 is less than the first speed V1.

[0015] As an optional solution, when the electrode module's processing depth on the area to be processed is not less than the preset depth, the electrode module lifts the tool in three stages, including the following steps:

[0016] The electrode module raises the blade at a constant speed of the third speed V3 in advance. When the electrode module raises the blade to a first preset height at a constant speed of the third speed V3 in advance, the electrode module then raises the blade at a constant speed of the fourth speed V4.

[0017] When the electrode module raises the blade to the second preset height at a constant speed of the fourth speed V4, the electrode module finally raises the blade at a constant speed of the fifth speed V5 until the electrode module reaches the standby position.

[0018] Wherein, the third speed V3 is less than the first speed V1, the fourth speed V4 is greater than the third speed V3, and the fifth speed V5 is greater than the fourth speed V4.

[0019] As an optional feature, the first preset height is 0.1mm to 0.3mm, and the second preset height is 0.4mm to 0.8mm.

[0020] As an optional solution, the preset depth is 50% to 70% of the actual processing depth of the area to be processed.

[0021] As an optional solution, after the electrode module stops feeding the area to be processed and before the electrode module lifts the tool, the flushing module is started so that the flushing module flushes the area to be processed between the electrode module and the area to be processed.

[0022] When the electrode module completes the lifting of the blade, the flushing module is closed.

[0023] As an optional solution, when the workpiece to be processed is divided into multiple interconnected processing areas, the processing structure on each processing area is in a complete state.

[0024] An electrical discharge machining (EDM) apparatus is provided, wherein the EDM apparatus processes the workpiece to be processed using the EDM method described above. The EDM apparatus includes an EDM machine tool and an EDM electrode. The EDM electrode is disassembled into multiple independent electrode modules, each of which is detachably mounted on the EDM machine tool. The EDM machine tool is configured to drive the electrode modules to move.

[0025] The beneficial effects of this invention are:

[0026] This invention provides an electrical discharge machining (EDM) method. The workpiece is divided into multiple interconnected processing areas, and the EDM electrode is disassembled into multiple independent electrode modules. Each electrode module corresponds one-to-one with a processing area. Each electrode module processes its corresponding processing area sequentially until all processing areas are completed. This reduces the discharge area of ​​each electrode module and the relative area between each module and the processing area during machining. This ensures that the working fluid fully penetrates and wets the processing area, effectively cools it, and promptly removes etching products, preventing damage to the workpiece and ensuring machining quality. Furthermore, by reducing the relative area between each electrode module and the processing area, large instantaneous negative fluid pressure is avoided when the electrode module is lifted, preventing damage to the workpiece and further ensuring machining quality.

[0027] This invention also provides an electrical discharge machining (EDM) apparatus. By employing the aforementioned EDM method to process the workpiece, this apparatus reduces the discharge area of ​​each electrode module in the processing area and the relative area between each electrode module and the processing area. This ensures that the working fluid fully penetrates and wets the processing area during processing, adequately cools the processing area, and promptly removes erosion products, preventing damage to the workpiece and guaranteeing processing quality. Furthermore, by reducing the relative area between each electrode module and the processing area, it also avoids generating large instantaneous negative fluid pressure when each electrode module is lifted, thus preventing damage to the workpiece due to negative fluid pressure and further ensuring processing quality. Attached Figure Description

[0028] Figure 1 This is a flowchart of the electrical discharge machining method provided in the embodiments of the present invention;

[0029] Figure 2 This is an isometric view of the workpiece to be processed provided in an embodiment of the present invention;

[0030] Figure 3 This is a top view of the workpiece to be processed provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of one of the electrode modules provided in an embodiment of the present invention;

[0032] Figure 5 This is a flowchart of lifting the electrode module in the electrical discharge machining method provided in this embodiment of the invention.

[0033] In the picture:

[0034] 100. Workpiece to be processed; 110. Area to be processed; 111. Processing structure;

[0035] 210. Electrode module; 211. Connecting part; 212. Electrode part. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] In related technologies, when machining large-area hard and brittle material workpieces using electrical discharge electrodes (EDE), the large discharge area of ​​the EDE during machining—meaning a large area between the EDE and the workpiece—makes it difficult for the working fluid to penetrate to the central region or micro-dead corners of the discharge gap. This results in insufficient wetting of the machining area of ​​the hard and brittle material workpiece by the working fluid. Poor wetting can easily lead to insufficient cooling of the discharge area, and the erosion products (carbon deposits) generated during machining cannot be discharged with the working fluid, easily causing short circuits, arcing, or carbon buildup. Ultimately, this can cause the EDE to stop discharging and result in hard extrusion, damaging the hard and brittle material workpiece. Furthermore, because hard and brittle material workpieces are prone to brittle fracture under external forces, when machining large-area hard and brittle material workpieces using EDE, a very strong instantaneous fluid negative pressure (i.e., vacuum adsorption effect) is generated between the EDE and the hard and brittle material workpiece during the tool retraction. This fluid negative pressure can easily tear apart the micro-array structure machined on the surface of the hard and brittle material workpiece.

[0041] To solve the above problems, such as Figure 1 As shown, this embodiment provides an electrical discharge machining (EDM) method, which includes the following steps:

[0042] The workpiece 100 to be processed is divided into multiple spliced ​​and connected processing areas 110, and the electric discharge electrode is disassembled into multiple independent electrode modules 210. The multiple electrode modules 210 correspond one-to-one with the multiple processing areas 110, and each electrode module 210 processes the corresponding processing area 110.

[0043] Multiple electrode modules 210 sequentially process the corresponding areas to be processed 110 until the processing of each area to be processed 110 is completed.

[0044] The electrical discharge machining method provided in this embodiment, by having multiple electrode modules 210 sequentially process the corresponding areas 110 to be processed until the processing of each area 110 is completed, reduces the discharge area of ​​each electrode module 210 in the area 110 to be processed during the processing of the workpiece 100. This reduces the relative area between each electrode module 210 and the area 110 to be processed, ensuring that the working fluid fully penetrates and wets the area 110 during processing, effectively cooling the area 110 and promptly removing erosion products, thus preventing damage to the workpiece 100 and ensuring processing quality. Furthermore, by reducing the relative area between each electrode module 210 and the area 110 to be processed, a large instantaneous negative fluid pressure is avoided when each electrode module 210 is lifted, preventing damage to the workpiece 100 due to negative fluid pressure and further ensuring processing quality.

[0045] It should be noted that when the electrode module 210 processes the corresponding processing area 110, there is a small gap between the electrode module 210 and the processing area 110, that is, the electrode module 210 performs non-contact processing.

[0046] Optionally, in this embodiment, as Figure 2 and Figure 3 As shown, when the workpiece 100 to be processed is divided into multiple interconnected processing areas 110, the processing structure 111 on each processing area 110 is in a complete state, thereby ensuring the reliability of processing each processing structure 111.

[0047] Optionally, when dividing the workpiece 100 to be processed into regions, the division is based on the size and shape of the workpiece 100. Optionally, the number of processing structures 111 on each processing region 110 is 5 to 15, and the total area of ​​the processing structures 111 on each processing region 110 is no greater than 60mm × 60mm, thereby ensuring processing quality. Optionally, in this embodiment, when dividing the workpiece 100 to be processed into regions, the shape of each processing region 110 is as regular as possible, and the shape of the processing region 110 can be circular, square, or square-like, etc. It should be noted that during the process of disassembling the electrical discharge electrode into multiple independent electrode modules 210, it is sufficient to ensure that each electrode module 210 is compatible with the corresponding processing region 110. For example, in this embodiment, the workpiece 100 to be processed is a disc structure, and the processing region 110 is square or square-like.

[0048] Specifically, in this embodiment, during the process of dividing and disassembling the workpiece 100 to be processed and the electrical discharge electrode, the center point of the workpiece 100 to be processed is taken as the zero point of the coordinate system, and the workpiece 100 to be processed is divided into several blocks around the zero point of the coordinate system.

[0049] Reference Figure 4 As shown, the electrode module 210 includes a connecting portion 211 and a plurality of electrode portions 212 spaced apart on the connecting portion 211. Based on the number, shape, and size of the processing structures 111 on the processing area 110, the number, shape, and size of the corresponding electrode portions 212 on the electrode module 210 are designed to ensure that the plurality of electrode portions 212 correspond one-to-one with and are adapted to the plurality of processing structures 111. Optionally, in this embodiment, the electrode portion 212 is a copper tube, and the connecting portion 211 is square.

[0050] It should be noted that during the processing, the workpiece 100 to be processed is placed on the processing platform of the electrical discharge machining device. The bottom plane of the processing structure 111 is taken as the zero point of the Z-axis. The electrode modules 210 are installed sequentially on the electrical discharge machining machine tool of the electrical discharge machining device. The height between the electrode part 212 and the workpiece 100 to be processed relative to the Z-axis is determined according to the length of the electrode part 212 to ensure the accuracy of the processing.

[0051] Optionally, in this embodiment, when manufacturing each electrode module 210, a wear allowance is reserved on each electrode module 210 to facilitate the trimming of the worn portion of the electrode module 210 after a single machining operation. Before reusing the electrode module 210 after wear trimming, the relative zero point position of the reference plane of the electrode module 210 in the Z-axis direction needs to be corrected to determine the standby position of the electrode module 210 in the Z-axis. Therefore, an electrode recycling process with reference correction function can be designed in the electrical discharge machining method to achieve high-precision reuse of the electrode module 210.

[0052] It should be noted that during the processing of each electrode module 210 and the corresponding processing area 110, the electrode module 210 needs to be lifted periodically so that the working fluid can promptly remove the erosion products generated during the processing.

[0053] In addition, it should be noted that before the electrode module 210 processes the processing area 110 in the workpiece 100, the processing structure 111 in the processing area 110 has been preliminarily made and has a certain margin.

[0054] In this embodiment, as Figure 5 As shown, when lifting the electrode module 210, if the machining depth of the area 110 to be machined is less than the preset depth, the electrode module 210 is lifted in two stages, including the following steps:

[0055] The electrode module 210 raises the blade at a constant speed of the first speed V1. When the electrode module 210 raises the blade to a preset height at a constant speed of the first speed V1, the electrode module 210 raises the blade at a constant speed of the second speed V2 until the electrode module 210 reaches the standby position.

[0056] The second speed V2 is greater than the first speed V1.

[0057] The above configuration allows the electrode module 210 to be slowly raised at a first speed V1 during the tool lifting process, thereby breaking the vacuum adsorption effect between the electrode module 210 and the processing area 110 and reducing the instantaneous fluid negative pressure between the electrode module 210 and the processing area 110. Then, the electrode module 210 is rapidly raised to the standby position at a second speed V2. In addition, by having the electrode module 210 first open the gap between the electrode module 210 and the processing area 110 at a low speed and then raise the tool at a high speed, sufficient time is provided for the working fluid to flow into the gap between the electrode module 210 and the processing area 110, further reducing the negative pressure.

[0058] Optionally, in this embodiment, the preset height is 0.4mm to 1mm. Specifically, it can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. Optionally, the first speed V1 is 5mm / min to 30mm / min, and the second speed V2 is 30mm / min to 50mm / min. Optionally, the electrode module 210 raises the blade at a uniform speed of the second speed V2 to a height of 0.5mm to 1mm.

[0059] It should be noted that as the processing depth of the electrode module 210 in the area 110 to be processed increases, the gap between the electrode module 210 and the hole wall of the area 110 to be processed further decreases, and the etch products generated during processing are more likely to accumulate in the hole, resulting in a more pronounced vacuum adsorption effect than in shallow holes. Furthermore, the accumulation of etch products to a certain extent will trigger secondary discharge and burn the hole wall. In addition, in the deep hole of the area 110 to be processed, the vacuum zone is not uniformly distributed, exhibiting a "bottom reinforcement" effect. In the orifice area, the working fluid can partially flow back, and the pressure recovers quickly after the vacuum bubbles generated during the discharge process collapse, resulting in a short duration and low intensity of negative pressure. However, in the bottom area of ​​the deep hole, the liquid return path of the working fluid is severely blocked due to the sealing of the hole wall. After the vacuum bubbles collapse, a "stagnant low-pressure cavity" is formed, extending the duration of negative pressure and becoming the most significant negative pressure peak area in the entire deep hole. Because the vacuum zone is not uniformly distributed, the negative pressure is more unstable. In summary, as the processing depth of the electrode module 210 in the processing area 110 increases, the negative pressure between the electrode module 210 and the processing area 110 becomes larger and more unstable. Furthermore, at this processing depth, when the electrode module 210 first lifts the tool, the vacuum level in the deep hole suddenly decreases, and the high-speed influx of outside air impacts the electrode module 210 and the hole wall. The slender electrode module 210 will wobble due to the sudden change in force, which may scratch the processed hole wall or even break it directly. The rapid vacuum break will cause the etched products that were originally adsorbed by the negative pressure to instantly lose their restraint and fall to the bottom of the deep hole in large quantities. In particular, the etched products of hard and brittle materials have high hardness and density, making them easier to deposit, and their sharp edges are easy to get stuck in the gaps. Subsequent feeding may block the gaps and cause secondary discharge.

[0060] To address the aforementioned issues, in this embodiment, when the machining depth of the area 110 to be machined by the electrode module 210 is not less than a preset depth, the electrode module 210 performs a multi-segment lifting motion, with each segment's lifting speed exceeding that of the preceding segment. Furthermore, the electrode module 210 initially lifts the electrode at a third speed V3, which is less than the first speed V1. This configuration, as the machining depth of the area 110 to be machined increases, reduces the initial lifting speed of the electrode module 210 (ensuring the third speed V3 is less than the first speed V1), thereby breaking the vacuum more slowly. This allows for a more stable pressure change within the hole, preventing significant impact and reducing the amount of etched products accumulating at the bottom of the hole. It also facilitates the orderly flow of the working fluid into the deep hole, carrying away the etched products, and prevents disorderly splashing of etched products that could damage the machined surface. In addition, by increasing the number of rising segments of the electrode module 210, sufficient time is provided for the working fluid to flow into the gap between the electrode module 210 and the area to be processed 110. Furthermore, by gradually increasing the lifting speed, the lifting of the tool not only ensures work efficiency but also helps to maintain the stability of the fluid pressure in the discharge gap, so that the electro-erosion products can be completely discharged.

[0061] Specifically, such as Figure 5 As shown, when the machining depth of the electrode module 210 in the area 110 to be machined is not less than the preset depth, the electrode module 210 lifts the tool in three stages, including the following steps:

[0062] The electrode module 210 raises the blade at a constant speed of the third speed V3. When the electrode module 210 raises the blade to a first preset height at a constant speed of the third speed V3, the electrode module 210 then raises the blade at a constant speed of the fourth speed V4.

[0063] When the electrode module 210 raises the blade to the second preset height at a constant speed of the fourth speed V4, the electrode module 210 finally raises the blade at a constant speed of the fifth speed V5 until the electrode module 210 reaches the standby position.

[0064] In this sequence, the third speed V3 is less than the first speed V1, the fourth speed V4 is greater than the third speed V3, and the fifth speed V5 is greater than the fourth speed V4. That is, V5 > V4 > V3, and V2 > V1 > V3. It should be noted that there is no strict requirement regarding the relative magnitudes of the first and fourth speeds V1 and V4, as long as V5 > V4 > V3, V2 > V1, and V1 > V3.

[0065] Optionally, in this embodiment, the first preset height is 0.1mm to 0.3mm, specifically 0.1mm, 0.2mm, or 0.3mm. Optionally, the second preset height is 0.4mm to 0.8mm, specifically 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm. The above settings ensure that the second preset height is slightly greater than the first preset height, that is, the rising height of the middle section is greater than the rising height of the first section. Furthermore, the rising height of the tail section is 0.6mm to 1mm.

[0066] Optionally, in this embodiment, the third speed V3 is 2 mm / min to 4 mm / min, specifically 2 mm / min, 3 mm / min, or 4 mm / min. Optionally, the fourth speed V4 is 5 mm / min to 30 mm / min, and the fifth speed V5 is 30 mm / min to 50 mm / min.

[0067] Optionally, in this embodiment, the preset depth is 50% to 70% of the actual processing depth of the area to be processed 110. Specifically, the preset depth is 50%, 55%, 60%, 65%, or 70% of the actual processing depth of the area to be processed 110.

[0068] It should be noted that when the electrode module 210 completes the tool lifting operation and needs to move towards the processing area 110 for feeding, the electrode module 210 feeds at a constant speed until it reaches the processing position.

[0069] Optionally, in this embodiment, after the electrode module 210 stops feeding the processing area 110 and before the electrode module 210 lifts its tool, the flushing module is activated to flush the area between the electrode module 210 and the processing area 110 with fluid; when the electrode module 210 completes lifting its tool, the flushing module is closed. This configuration ensures that before lifting its tool, the electrode module 210 flushes the area between itself and the processing area 110 with fluid, further reducing the negative pressure between them. Optionally, the flushing module is activated within 0.1s to 0.3s before the electrode module 210 lifts its tool.

[0070] This embodiment also provides an electrical discharge machining (EDM) apparatus. This EDM apparatus uses the aforementioned EDM method to process the workpiece 100. The EDM apparatus includes an EDM machine tool and EDM electrodes. The EDM electrodes are disassembled into multiple independent electrode modules 210. Each electrode module 210 is detachably mounted on the EDM machine tool, which is configured to drive the electrode modules 210 to move. By employing the aforementioned EDM method to process the workpiece 100, the EDM apparatus provided in this embodiment reduces the discharge area of ​​each electrode module 210 in the processing area 110, and reduces the relative area between each electrode module 210 and the processing area 110. This ensures that the working fluid fully penetrates and wets the processing area 110 during processing, effectively cools the processing area 110, and promptly removes erosion products, thus avoiding damage to the workpiece 100 and ensuring processing quality. By reducing the relative area between each electrode module 210 and the processing area 110, a large instantaneous fluid negative pressure is avoided when each electrode module 210 is lifted, thereby preventing fluid negative pressure from damaging the workpiece 100 and further ensuring the processing quality.

[0071] It should be noted that the electrical discharge machining (EDM) machine tool can drive the electrode module 210 to move horizontally, ensuring that the electrode module 210 is directly above the corresponding processing area 110. Furthermore, the EDM machine tool can also drive the electrode module 210 to move vertically, ensuring the feed and lifting of the electrode module 210. Since the specific structure and motion principle of the EDM machine tool are existing technology, they will not be described in detail here.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An electrical discharge machining method, characterized in that, Includes the following steps: The workpiece (100) to be processed is divided into multiple spliced ​​processing areas (110), and the electric discharge electrode is disassembled into multiple independent electrode modules (210). Each electrode module (210) corresponds to one of the multiple processing areas (110), and each electrode module (210) processes the corresponding processing area (110). Multiple electrode modules (210) sequentially process the corresponding areas to be processed (110) until the processing of each area to be processed (110) is completed; During the processing of the corresponding processing area (110) of each electrode module (210), the electrode module (210) needs to be lifted at regular intervals; When the processing depth of the electrode module (210) on the area to be processed (110) is less than the preset depth, the electrode module (210) lifts the tool in two stages, including the following steps: The electrode module (210) raises the blade at a first speed V1 at a constant speed. When the electrode module (210) raises the blade at a preset height at the first speed V1 at a constant speed, the electrode module (210) raises the blade at a second speed V2 at a constant speed until the electrode module (210) reaches the standby position. Wherein, the second speed V2 is greater than the first speed V1.

2. The electrical discharge machining method according to claim 1, characterized in that, The preset height is 0.4mm to 1mm.

3. The electrical discharge machining method according to claim 1, characterized in that, When the processing depth of the electrode module (210) on the area to be processed (110) is not less than the preset depth, the electrode module (210) lifts the tool in multiple segments, and the lifting speed of each segment is greater than the lifting speed of the previous segment. The electrode module (210) lifts the tool in advance at a third speed V3, and the third speed V3 is less than the first speed V1.

4. The electrical discharge machining method according to claim 3, characterized in that, When the electrode module (210) processes the area to be processed (110) to a depth not less than the preset depth, the electrode module (210) lifts the tool in three stages, including the following steps: The electrode module (210) raises the blade at a constant speed of the third speed V3 in advance. When the electrode module (210) raises the blade to a first preset height at a constant speed of the third speed V3 in advance, the electrode module (210) then raises the blade at a constant speed of the fourth speed V4. When the electrode module (210) raises the blade to the second preset height at a constant speed of the fourth speed V4, the electrode module (210) finally raises the blade at a constant speed of the fifth speed V5 until the electrode module (210) reaches the standby position. Wherein, the third speed V3 is less than the first speed V1, the fourth speed V4 is greater than the third speed V3, and the fifth speed V5 is greater than the fourth speed V4.

5. The electrical discharge machining method according to claim 4, characterized in that, The first preset height is 0.1mm to 0.3mm, and the second preset height is 0.4mm to 0.8mm.

6. The electrical discharge machining method according to any one of claims 1 to 5, characterized in that, The preset depth is 50% to 70% of the actual processing depth of the area to be processed (110).

7. The electrical discharge machining method according to any one of claims 1 to 5, characterized in that, After the electrode module (210) stops feeding the processing area (110) and before the electrode module (210) lifts the tool, the flushing module is started so that the flushing module flushes between the electrode module (210) and the processing area (110); When the electrode module (210) completes the lifting of the blade, the flushing module is closed.

8. The electrical discharge machining method according to any one of claims 1 to 5, characterized in that, When the workpiece (100) to be processed is divided into multiple spliced ​​processing areas (110), the processing structure (111) on each processing area (110) is in a complete state.

9. An electrical discharge machining apparatus, characterized in that, The electrical discharge machining apparatus uses the electrical discharge machining method as described in any one of claims 1 to 8 to process the workpiece (100). The electrical discharge machining apparatus includes an electrical discharge machining machine tool and an electrical discharge electrode. The electrical discharge electrode is disassembled into multiple independent electrode modules (210). Each electrode module (210) can be detachably installed on the electrical discharge machining machine tool. The electrical discharge machining machine tool is configured to drive the electrode module (210) to move.

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