A method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and high-molybdenum alloy steel

Abstract

This invention discloses a method for machining inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel using electrical discharge machining (EDM). The method employs a first set of electrodes, including a first electrode, a second electrode, and a third electrode, to machine each inclined groove. First, roughing is performed using the first electrode, followed by semi-finishing using the second electrode, and finally finishing using the third electrode. After machining several inclined grooves, when the first electrode in the first set wears out, the inclined grooves are machined using a second set of electrodes, including a second electrode, a third electrode, and a fourth electrode. When machining each inclined groove using the second set of electrodes, roughing is performed first with the second electrode, followed by semi-finishing with the third electrode, and finally finishing with the fourth electrode; and so on. When the (n-3)th electrode in the (n-3)th set wears out, the (n-2)th set of electrodes is used to machine the inclined groove. The (n-2)th set of electrodes includes the (n-2)th electrode, the (n-1)th electrode, and the nth electrode. When machining each inclined groove using the (n-2)th set of electrodes, roughing is performed first with the (n-2)th electrode, followed by semi-finishing with the (n-1)th electrode, and finally finishing with the nth electrode. The purpose of this invention is to improve machining efficiency and reduce production costs while ensuring machining quality.

Description

Technical Field

[0001] This invention belongs to the field of high-carbon, high-chromium, and high-molybdenum alloy steel processing technology, specifically relating to a method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and high-molybdenum alloy steel. Background Technology

[0002] High-carbon, high-chromium-molybdenum alloy steel (Cr18Mo16V) is a high-performance material. Due to its hardness (HRC≥58), it exhibits extremely high hardness, wear resistance, and hot hardness in industrial production, making it widely used in applications requiring high loads and extreme temperatures. However, the uneven internal structure of this material leads to poor overall machinability. In traditional machining processes, such as milling Cr18Mo16V alloy steel parts using machining centers, especially when machining materials like… Figure 1 As shown in the three examples of inclined grooves, due to the high hardness and inhomogeneity of the material, chipping is very likely to occur at the junction of the inclined groove with the outer circle and end face, severely affecting the processing accuracy and final quality of the product. This problem not only increases the scrap rate but also reduces production efficiency and increases production costs.

[0003] To overcome the limitations of traditional machining methods, the industry has begun exploring the use of electrical discharge machining (EDM) technology to process these difficult-to-machine hard materials. EDM, with its high energy density during pulsed discharge, enables the machining of special materials and complex-shaped parts that are difficult or impossible to machine using conventional mechanical methods, unaffected by the hardness of the parts. Therefore, replacing milling-based grooving with EDM grooving has become a viable solution. During EDM grooving, the part typically needs to be clamped in a fixture to ensure machining stability. For example, a common method is to mount the part in a triangular square, assemble a fixture with a 7° included angle, and then fix the three squares containing the part in the fixture, machining the grooves one by one using a single electrode. After machining one grooving, the three squares need to be removed from the fixture, the clamping position readjusted, and then the other two grooves are machined in sequence. While this machining method avoids the chipping phenomenon that occurs in traditional milling, the use of a single electrode results in extremely rapid electrode wear. An electrode can only process 1 to 3 parts before needing to be replaced. This not only reduces machining efficiency but also increases production costs, limiting the widespread application of this technology in industrial production. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel, aiming to improve machining efficiency and reduce production costs while ensuring machining quality.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] A method for electrical discharge machining (EDM) of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel involves using a multi-head electrode to perform EDM on the workpiece. The multi-head electrode comprises n electrodes, each with an end face slope identical to the slope of the inclined groove on the workpiece, where n is greater than 3. The machining method includes:

[0007] The first set of electrodes is used to process the inclined groove to be processed. The first set of electrodes includes a first electrode, a second electrode and a third electrode. When processing each inclined groove with the first set of electrodes, the first electrode is used for roughing, the second electrode is used for semi-finishing, and the third electrode is used for finishing.

[0008] After machining several inclined grooves, when the first electrode in the first group of electrodes wears out, the second group of electrodes is used to machine the inclined grooves to be machined. The second group of electrodes includes a second electrode, a third electrode, and a fourth electrode. When machining each inclined groove with the second group of electrodes, the second electrode is used for rough machining, the third electrode is used for semi-finishing, and the fourth electrode is used for finishing.

[0009] Similarly, when the (n-3)th electrode in the (n-3)th group of electrodes wears out, the (n-2)th group of electrodes is used to process the inclined groove to be processed. The (n-2)th group of electrodes includes the (n-2)th electrode, the (n-1)th electrode, and the nth electrode. When processing each inclined groove with the (n-2)th group of electrodes, the (n-2)th electrode is used for roughing first, the (n-1)th electrode is used for semi-finishing, and finally the nth electrode is used for finishing.

[0010] Furthermore, before processing, the multi-head electrode is clamped on the worktable, and the part to be processed is clamped on the spindle;

[0011] For the same part to be processed, after processing one inclined groove, the spindle is rotated by a set angle before processing the next inclined groove.

[0012] Furthermore, the step of clamping the workpiece to be processed onto the spindle specifically involves:

[0013] The workpiece to be processed is clamped on the spindle by using a bushing and a set screw.

[0014] Furthermore, after clamping the workpiece onto the spindle, the process also includes:

[0015] The tool setting between the multi-head electrode and the workpiece is performed by using an edge-touching method.

[0016] Furthermore, the length of each electrode is the same as the designed length of the skew groove to be processed.

[0017] Furthermore, the width of each electrode is 0.06mm to 0.08mm smaller than the designed width of the inclined groove to be processed.

[0018] Furthermore, the multi-head electrode comprises 10 electrodes.

[0019] Furthermore, the multi-head electrode is manufactured using copper-tungsten alloy steel plate.

[0020] Furthermore, the multi-head electrode includes a clamping part and n electrodes disposed at the end of the clamping part.

[0021] Furthermore, the clamping part and the n electrodes disposed at the end of the clamping part are integrated into a single design.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] This invention provides a method for machining inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel using electrical discharge machining (EDM). Compared to single-electrode EDM, this method employs a multi-electrode system, using electrodes in groups of three. Each group performs roughing, semi-finishing, and finishing on a separate basis. When the electrode used for roughing in a group wears out, the next group of electrodes is used, repeating the same process. The electrode used for roughing in the next group uses the same electrode used for semi-finishing in the previous group, the same electrode used for semi-finishing in the next group, and the unused electrode used for finishing in the next group. This staggered machining method not only optimizes electrode utilization but also avoids the decrease in machining accuracy caused by excessive electrode wear, thereby improving the machining accuracy and final quality of the product. Furthermore, the continuous machining method using multiple electrodes reduces the frequency of electrode replacement, maximizing electrode utilization and significantly increasing the number of uses, directly reducing electrode consumption and replacement costs, and ultimately lowering overall production costs. In summary, the method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel proposed in this invention has significant advantages in improving machining efficiency, reducing production costs, enhancing machining accuracy and product quality, increasing machining stability, and broadening the application range.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a flowchart illustrating a method for electrically conductive machining a slanted groove in high-carbon, high-chromium, and molybdenum alloy steel according to an embodiment of the present invention.

[0027] Figure 2 This is an isometric view of a multi-head electrode in a method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel according to an embodiment of the present invention.

[0028] Figure 3 This is an isometric view of the part to be processed in a method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel according to an embodiment of the present invention.

[0029] Figure 4 This is a cross-sectional view of the part to be processed in a method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel according to an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the length setting in a method for machining inclined grooves of high-carbon, high-chromium, and molybdenum alloy steel using electrical discharge machining, according to an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of diameter tool setting in a method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the clamping of the workpiece in a method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel according to an embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the multi-electrode dimensions in a method for machining inclined grooves of high-carbon, high-chromium, and molybdenum alloy steel using electrical discharge machining, according to an embodiment of the present invention.

[0034] In the figure, 1-multi-head electrode; 10-clamping part; 11-electrode; 2-workpiece to be processed; 3-bulb; 4-tightening screw. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Combination Figure 1As shown, this embodiment of the invention provides a method for electrical discharge machining (EDM) of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel. A multi-head electrode 1 is used to perform EDM on the workpiece 2. The multi-head electrode 1 comprises n electrodes 11, each electrode 11 having the same end face slope as the inclined groove of the workpiece 2, where n is greater than 3. This method, by employing a multi-head electrode 1, improves machining efficiency, reduces production costs, and simultaneously ensures machining quality.

[0037] The specific method for EDM machining of inclined grooves in high-carbon, high-chromium, and molybdenum alloy steel is as follows: A first set of electrodes, comprising a first electrode, a second electrode, and a third electrode, is used to machine each inclined groove. First, roughing is performed using the first electrode, followed by semi-finishing using the second electrode, and finally finishing using the third electrode. After machining several inclined grooves, when the first electrode in the first set wears out, the inclined grooves are machined using a second set of electrodes, comprising a second electrode, a third electrode, and a fourth electrode. When machining each slant with two sets of electrodes, the second electrode is used for roughing, the third electrode for semi-finishing, and the fourth electrode for finishing. This process continues until the (n-3)th electrode in the (n-3)th set wears out. The (n-2)th set of electrodes is then used to machine the slant. The (n-2)th set of electrodes includes the (n-2)th electrode, the (n-1)th electrode, and the nth electrode. When machining each slant with the (n-2)th set of electrodes, the (n-2)th electrode is used for roughing, the (n-1)th electrode for semi-finishing, and the nth electrode for finishing.

[0038] Specifically, a multi-head electrode is designed and manufactured according to the specific dimensions and slope requirements of the inclined groove to be processed. The end face slope of each electrode must match the slope of the inclined groove to ensure processing accuracy. The multi-head electrode contains n electrodes (n>3). Considering the high hardness and wear resistance of high-carbon high-chromium-molybdenum alloy steel, the electrode material should be selected from materials with high conductivity, high hardness, and good heat resistance, such as copper-tungsten alloy or silver-tungsten alloy, to ensure the durability of the electrode and processing efficiency. The first set of electrodes (first electrode, second electrode, and third electrode) is used for processing. Roughing is performed using the first electrode to remove most of the material, followed by semi-finishing using the second electrode to further refine the shape and dimensions, and finally finishing using the third electrode to achieve the final dimensions and surface quality requirements. When the first electrode in the first set wears to a certain extent and affects processing accuracy, it is replaced with the second set of electrodes (second electrode, third electrode, and fourth electrode), and processing continues in the order of roughing, semi-finishing, and finishing. Similarly, when the (n-3)th electrode in the (n-3)th group of electrodes wears out, it is replaced with the (n-2)th group of electrodes.

[0039] It should be understood that, based on the actual conditions during the machining process, EDM parameters, such as pulse width, pulse interval, discharge current, and discharge voltage, should be adjusted to optimize machining efficiency and quality. During and after machining, the dimensions, shape, and surface quality of the inclined groove should be inspected to ensure they meet design requirements. Based on the inspection results, feedback analysis should be conducted on machining parameters and electrode wear, and adjustments and optimizations should be made as necessary to improve machining efficiency and quality.

[0040] This invention reduces electrode replacement frequency and downtime by employing a multi-head electrode, thereby lowering production costs. The continuous processing method using multi-head electrodes improves processing efficiency and shortens the production cycle. Grouping the individual electrodes of the multi-head electrode for roughing, semi-finishing, and finishing of the inclined groove allows for staggered processing, maximizing the utilization rate of each electrode and significantly increasing its number of uses.

[0041] In one feasible approach, combining Figure 3 , Figure 4 and Figure 7 As shown, before processing, the multi-head electrode 1 is clamped on the worktable, and the part to be processed is clamped on the spindle. For the same part to be processed, after processing one inclined groove, the spindle is rotated by a set angle before processing the next inclined groove.

[0042] Specifically, before machining begins, the multi-head electrode must first be clamped onto the worktable. Simultaneously, the workpiece to be machined is clamped onto the spindle. It should be understood that clamping the multi-head electrode requires positioning, clamping, and adjustment of its relative position to the worktable.

[0043] For the same part to be machined, after machining one slant, the spindle needs to be rotated to the machining position of the next slant. For example, when three evenly distributed slants need to be machined on the part, the included angle between each slant should be 120°. Therefore, after machining the first slant, the spindle should be rotated 120° to machine the second slant; after machining the second slant, it should be rotated another 120° to machine the third slant.

[0044] During the machining process, roughing, semi-finishing, and finishing should be performed using different groups of multi-head electrodes in the order described in the above embodiments. When an electrode in a group wears down to a certain extent and affects the machining accuracy, it should be replaced with the next group of electrodes in a timely manner.

[0045] In one feasible approach, combining Figure 7 As shown, the part to be processed 2 is clamped on the spindle, specifically by using the bushing 3 and the tightening screw 4 to clamp the part to be processed 2 on the spindle.

[0046] In other words, the part to be processed, 2, is clamped onto the spindle using the bushing 3 and the clamping screw 4. This method combines the supporting function of the bushing with the clamping force of the clamping screw to achieve the clamping of the part onto the spindle. For example, the bushing is made of a wear-resistant, corrosion-resistant material with a certain degree of elasticity, such as copper alloy or stainless steel. Its inner diameter should match the outer diameter of the part to be processed to ensure good contact and support. During installation, the bushing secures the part with the clamping screw before being mounted on the spindle. This clamping method facilitates quick installation and removal of the part to be processed, improving processing efficiency.

[0047] In one feasible approach, combining Figure 5 and Figure 6 As shown, after the workpiece is clamped on the spindle, the process also includes: using an edge-touching method to perform tool setting between the multi-head electrode and the workpiece.

[0048] Before setting the tool, ensure that the multi-head electrode is correctly mounted on the worktable. Edge-touching tool setting is a commonly used method that determines the relative position between the workpiece and the electrode by controlling the slight contact between the edge of the workpiece and the electrode. This method is simple, quick, and provides a clear visual representation of the actual distance between the workpiece and the electrode.

[0049] Specifically, first, the part to be machined is moved close to the multi-head electrode. During this process, the part should be moved slowly and smoothly to avoid damage from collisions. Then, the edge of the part is gradually moved closer to the electrode in small steps until the part makes slight contact with the electrode. Once the part makes contact with the electrode, the movement of the part should be stopped immediately, and the current position information should be recorded. By using an edge-touching method for tool setting between the part to be machined and the multi-head electrode, precise alignment between the electrode and the part is achieved, improving machining accuracy and reducing errors.

[0050] In one feasible approach, the length of each electrode is the same as the design length of the slant to be processed, ensuring that the electrode can completely cover the length of the slant during processing, thereby avoiding problems such as incomplete processing or inconsistent slant shape due to insufficient electrode length.

[0051] In other words, the electrode length is designed based on the specific dimensions and requirements of the inclined groove to be processed, so as to ensure that the length of the electrode matches the design length of the inclined groove. This ensures that the relative positional relationship between the electrode and the inclined groove is stable during the processing, thereby improving processing accuracy and reducing errors.

[0052] In one possible implementation, the existence of a discharge gap is considered, and the width of each electrode is 0.06mm to 0.08mm smaller than the designed width of the inclined groove to be processed. This ensures that the discharge gap between the electrode and the inclined groove is uniform and stable during processing, thereby improving processing accuracy and reducing errors. For example, the width of each electrode is 0.07mm smaller than the designed width of the inclined groove to be processed.

[0053] It should be understood that the discharge gap is an unavoidable phenomenon in the electrical discharge machining (EDM) process. When designing the electrode width, the size of the discharge gap must be fully considered to ensure that the width of the machined groove meets the design requirements. The electrode width design is based on the specific dimensions and requirements of the groove to be machined.

[0054] In one feasible approach, combining Figure 2 As shown, the multi-head electrode comprises 10 electrodes. This number of electrodes ensures high processing efficiency without placing an excessive burden on the equipment. In other words, this embodiment achieves comprehensive optimization of processing efficiency, processing quality, and equipment utilization by employing a multi-head electrode design with 10 electrodes.

[0055] It should be noted that in the design of multi-electrode, the layout of 10 electrodes must ensure that each electrode can participate in the electrical discharge machining evenly and effectively during the processing.

[0056] In one possible implementation, the multi-head electrode is fabricated using a copper-tungsten alloy steel plate. Copper-tungsten alloy is a high-performance composite material made from metallic tungsten and copper powder through high-temperature infiltration. It features a high melting point, high specific heat, and wear resistance, as well as excellent thermal and electrical conductivity. As the material for the multi-head electrode, the copper-tungsten alloy steel plate has high hardness, effectively resisting wear during processing and extending the electrode's service life. Simultaneously, it possesses good electrical conductivity, ensuring discharge efficiency during electrical discharge machining and improving processing speed. The copper-tungsten alloy remains stable at high temperatures and is not easily deformed, thus ensuring machining accuracy.

[0057] In one feasible approach, combining Figure 2 As shown, the multi-head electrode 1 includes a clamping part 10 and n electrodes 11 disposed at the end of the clamping part 10.

[0058] Specifically, the clamping part 10 is a crucial component connecting the electrode and the worktable, responsible for fixing the electrode and transmitting the current and signals required for machining. The design of the clamping part 10 should consider the electrode's stability, ease of replacement, and compatibility with the worktable. n electrodes 11 are evenly distributed at the end of the clamping part 10, forming a multi-head electrode machining surface. In this embodiment, the electrodes 11 and the clamping part 10 are integrally molded.

[0059] For example, copper-tungsten alloy steel plates are selected as electrode materials. First, the upper and lower surfaces of the copper-tungsten alloy steel plates are ground on a surface grinder to ensure their flatness. Finally, a vise is used to clamp and grind the two surfaces. The distance between each electrode, the length and diameter of each electrode, the center alignment zone, and the angle are machined on a machining center.

[0060] In one specific embodiment, the method of the present invention is used in, for example... Figure 3 and Figure 4 The method described above involves machining inclined grooves on high-carbon, high-chromium, and molybdenum alloy steel. The programming utilizes a polarity reversal function (split clamping the part, worktable clamping a multi-head electrode). The first three electrodes of the multi-head electrode (the first group of electrodes, a, b, and c) are used for roughing, semi-finishing, and finishing, respectively. After machining the first inclined groove, the spindle rotates 120° to machine the second inclined groove in the same manner. After completing the second inclined groove, the spindle rotates 120° to machine the third inclined groove in the same way. The first group of electrodes can machine 28-32 parts. After electrode a wears out, the second group of electrodes (b, c, and d) are used for roughing, semi-finishing, and finishing, respectively, and so on. One multi-head electrode can machine 224-256 parts. When all electrodes wear out, the worn electrodes can be cut off, and 10 identical electrodes can be cut from the same electrode plate for machining. This method not only effectively ensures part quality and improves machining efficiency but also reduces production costs and guarantees on-time delivery of parts.

[0061] When processing these types of parts using a single electrode, the electrode wears out quickly. A single electrode can only process 1 to 2 parts before needing to be replaced. In addition, processing a slanted groove requires rotating the part once, resulting in low processing efficiency and high processing costs.

[0062] In this embodiment, combined with Figure 8 As shown, the width B of the entire multi-head electrode is 50mm, the width L of a single electrode is 1.4mm, and the distance L1 from a single electrode to the center of the entire multi-head electrode is 24.3mm.

[0063] The method of this invention was verified by processing inclined grooves and shaped grooves in various high-carbon, high-chromium, and molybdenum alloy steels and similar materials. It facilitates the processing of multiple inclined grooves or shaped grooves that are difficult or impossible to process using conventional methods. The method is simple to operate, has no implementation difficulties, and can effectively guarantee the processing quality and efficiency of parts. Furthermore, this method is convenient to use on the production floor and can be adopted by all high-carbon, high-chromium, and molybdenum alloy steel and similar material inclined groove and shaped groove parts, improving processing efficiency and the pass rate of parts.

[0064] In the description of this invention, it should be understood that the terms "upper", "lower", "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 invention 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 invention.

[0065] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for electrically discharge machining (EDM) of inclined grooves in high-carbon, high-chromium, and high-molybdenum alloy steel, characterized in that, A multi-electrode system is used for electrical discharge machining (EDM) of the workpiece. The multi-electrode system comprises n electrodes, each with an end face slope identical to the slope of the groove to be machined on the workpiece, where n is greater than 3. The machining method includes: The first set of electrodes is used to process the inclined groove to be processed. The first set of electrodes includes a first electrode, a second electrode and a third electrode. When processing each inclined groove with the first set of electrodes, the first electrode is used for roughing, the second electrode is used for semi-finishing, and the third electrode is used for finishing. After machining several inclined grooves, when the first electrode in the first group of electrodes wears out, the second group of electrodes is used to machine the inclined grooves to be machined. The second group of electrodes includes a second electrode, a third electrode, and a fourth electrode. When machining each inclined groove with the second group of electrodes, the second electrode is used for rough machining, the third electrode is used for semi-finishing, and the fourth electrode is used for finishing. Similarly, when the (n-3)th electrode in the (n-3)th group of electrodes wears out, the (n-2)th group of electrodes is used to process the inclined groove to be processed. The (n-2)th group of electrodes includes the (n-2)th electrode, the (n-1)th electrode, and the nth electrode. When processing each inclined groove with the (n-2)th group of electrodes, the (n-2)th electrode is used for roughing first, the (n-1)th electrode is used for semi-finishing, and finally the nth electrode is used for finishing.

2. The method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 1, characterized in that, Before processing, the multi-head electrode is clamped on the worktable, and the part to be processed is clamped on the spindle. For the same part to be processed, after processing one inclined groove, the spindle is rotated by a set angle before processing the next inclined groove.

3. The method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 2, characterized in that, The process of clamping the workpiece onto the spindle specifically involves: The workpiece to be processed is clamped on the spindle by using a bushing and a set screw.

4. The method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 2, characterized in that, After clamping the workpiece onto the spindle, the process also includes: The tool setting between the multi-head electrode and the workpiece is performed by using an edge-touching method.

5. The method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 1, characterized in that, The length of each electrode is the same as the designed length of the skew groove to be processed.

6. The method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 1, characterized in that, The width of each electrode is 0.06mm to 0.08mm smaller than the designed width of the groove to be processed.

7. The method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 1, characterized in that, The multi-head electrode comprises 10 electrodes.

8. The method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 1, characterized in that, The multi-head electrode is manufactured using copper-tungsten alloy steel plate.

9. The method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 1, characterized in that, The multi-head electrode includes a clamping part and n electrodes disposed at the end of the clamping part.

10. A method for electrical discharge machining of inclined grooves in high-carbon, high-chromium, molybdenum alloy steel according to claim 9, characterized in that, The clamping part and the n electrodes disposed at the end of the clamping part are integrated into one unit.

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