Device and method for removing carbon deposition in electric spark machining

Abstract

The invention belongs to the technical field of electromachining, and particularly relates to a device and method for removing electrosparking carbon deposition. The device comprises an electrode mounting device and a pipeline fixing device, the electrode mounting device is connected with a machine tool through a machine tool connecting part, and an electrode matched with a workpiece to be machined is fixed to the electrode mounting device; the pipeline fixing device is fixed to the machine tool, an inlet pipeline is fixed to the pipeline fixing device, an inner outlet pipeline and an outer outlet pipeline are detachably connected to the inlet pipeline, and the inner outlet pipeline and the outer outlet pipeline are arranged close to the electrode and used for washing the electrode and a workpiece to be machined; according to the device, corresponding inner and outer outlet pipelines can be flexibly designed according to different machining structures and material characteristics, efficient and directional carbon deposit washing and discharging are achieved, the consistency of the machining size and the surface integrity of parts are remarkably improved, and the parts meet the strict acceptance standard.

Description

Technical Field

[0001] This invention belongs to the field of electrical discharge machining technology, specifically relating to an apparatus and method for removing carbon deposits from electrical discharge machining. Background Technology

[0002] High-pressure guide vane assemblies for aero-engines are typically manufactured using cast high-temperature alloy materials, such as K40M and DZ40M. These assemblies have complex structures, consisting of upper and lower edge plates and rear-view left and right blades. The edge plates often feature various groove shapes, including semi-circular, V-shaped, and long straight grooves. Due to the narrow groove structure and large machining depth, traditional machining methods are difficult to implement, thus electrical discharge machining (EDM) is frequently used. However, these high-temperature alloy materials have a high carbon content (typically 0.45%–0.55%), large machining allowances, and narrow structures. During EDM, carbide deposition, or carbon buildup, easily occurs on the electrode and part surfaces. Excessive carbon buildup can lead to short circuits, machining abnormalities, and consequently, surface burns, excessively thick remelted layers, and cracks, severely impacting surface quality and service performance, and failing to meet the high reliability requirements of aero-engines.

[0003] To address the aforementioned challenges of carbon buildup and chip removal, existing technologies have proposed an electrical discharge machining (EDM) method for deep and narrow venting grooves in guide vanes. This method involves pre-setting several bottom holes in the machining area using high-speed small-hole EDM, followed by EDM forming using hollow forming electrodes. Combined with lateral flushing and full immersion machining, this significantly improves chip removal and cooling conditions, thereby increasing machining efficiency and surface quality. While this approach alleviates carbon buildup and abnormal discharge issues to some extent and enhances the machining stability of deep and narrow grooves, it still has certain limitations. For example, the alignment accuracy between the pre-set bottom holes and the final groove shape is extremely high; the hollow electrodes are complex to manufacture and prone to wear; and the lateral flushing method is specific to the internal flow channel structure and is not suitable for all types of deep and narrow structures. Furthermore, the risk of carbon buildup is not completely eliminated when dealing with materials with higher carbon content or more complex groove structures, and the control and consistency of the surface remelted layer still need improvement.

[0004] Therefore, there is an urgent need to develop a process method that can comprehensively solve the problems of carbon buildup, chip removal difficulties, low processing efficiency, and difficulty in surface quality control in electrical discharge machining of high-carbon materials, so as to be applicable to the deep and narrow groove machining needs of high-temperature alloy parts for aero-engines, and improve the processing reliability and service performance of parts. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus and method for removing carbon deposits from electrical discharge machining (EDM), thereby solving the technical problems of carbon accumulation, chip removal difficulties, low processing efficiency, and difficulty in surface quality control in the EDM of high-carbon materials in the prior art.

[0006] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, this application discloses an apparatus for removing carbon deposits from electrical discharge machining (EDM), comprising: an electrode mounting device and a pipeline fixing device. The electrode mounting device is connected to a machine tool via a machine tool connection part, and an electrode adapted to the workpiece is fixed on the electrode mounting device. The pipeline fixing device is fixed on the machine tool, and an inlet pipeline is fixed on the pipeline fixing device. An internal outlet pipeline and an external outlet pipeline are detachably connected to the inlet pipeline. The internal outlet pipeline and the external outlet pipeline are disposed close to the electrode and are used to flush the electrode and the workpiece.

[0007] Preferably, the shape of the electrode is adapted to the workpiece to be processed, including V-shaped and semi-circular shapes.

[0008] Preferably, the internal outlet pipe, the external outlet pipe, and the inlet pipe are connected by threads.

[0009] Preferably, the inlet pipe is used for the inflow of flushing medium, and the inlet pipe has a diameter of 8 mm and an inlet pressure of 0.2 MPa.

[0010] Preferably, the rinsing medium is electrical discharge oil.

[0011] Preferably, the external outlet pipe has an external outlet for flushing medium near the workpiece to be processed. The external outlet for flushing medium consists of a number of holes evenly distributed on the external outlet pipe, with the holes facing downwards at a 45-degree angle to the horizontal.

[0012] Preferably, an internal outlet for flushing medium is provided on the internal outlet pipe near the workpiece to be processed. The internal outlet for flushing medium consists of holes evenly distributed on the internal outlet pipe, with the holes oriented at a 45-degree angle downwards from the horizontal direction.

[0013] Preferably, the shapes of the internal and external outlet pipes are adapted to the workpiece to be processed, including oblique elongated and semi-circular shapes.

[0014] Secondly, this application discloses a method for removing carbon deposits from electrical discharge machining, implemented using the apparatus described in any one of the above claims, comprising: The electrode is installed on the EDM machine tool, and the device for removing carbon deposits from EDM is fixed on the EDM machine tool above the workpiece to be processed, so that the closest point of the internal outlet pipe to the electrode is mm, and the closest point of the external outlet pipe to the electrode is mm. When finishing the workpiece, the device for removing carbon deposits from EDM is turned on, and the flushing medium enters the external outlet pipe and the internal outlet pipe through the inlet pipe. The flushing medium in the external outlet pipe flushes the outside of the electrode and the workpiece, while the flushing medium in the internal outlet pipe flushes the inside of the electrode and the workpiece.

[0015] Preferably, the shape of the electrode is adapted to the workpiece to be processed, including V-shaped and semi-circular shapes; the shapes of the internal outlet pipe and the external outlet pipe are adapted to the workpiece to be processed, including oblique elongated and semi-circular shapes, then including: Install a semi-circular electrode on an EDM machine tool, and fix a device for removing carbon deposits from EDM on the EDM machine tool above the workpiece to be processed, such that the inner outlet pipe of the semi-circular electrode is closest to the electrode at mm, and the outer outlet pipe is closest to the electrode at mm. When finishing the semi-circular groove of the workpiece, the device for removing carbon deposits from EDM is turned on, and the flushing medium enters the external outlet pipe and the internal outlet pipe through the inlet pipe respectively. The flushing medium in the external outlet pipe flushes the outside of the semi-circular electrode and the semi-circular groove, and the flushing medium in the internal outlet pipe flushes the inside of the semi-circular electrode and the semi-circular groove. Disassemble the semi-circular internal outlet pipe and replace it with a long, slanted internal outlet pipe; replace the electrode with a V-shaped electrode, and repeat the above steps to machine the V-groove of the workpiece.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a dedicated carbon removal device and method, effectively solving the problems of short circuits, surface burns, and quality defects caused by carbon buildup in complex groove shapes such as semi-circular grooves, V-grooves, and long straight grooves of high-conductivity blades during electrical discharge machining (EDM). The device can flexibly design corresponding internal and external outlet pipes to suit different machining structures and material characteristics, achieving efficient and directional carbon flushing and removal. This significantly improves the consistency of part dimensions and surface integrity, enabling parts to meet stringent acceptance standards. Furthermore, its flushing method is universally applicable, and the device structure has good replaceability and adaptability, providing a universal and reliable technical means to solve the carbon buildup problem in narrow groove EDM of high-temperature alloys. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a diagram of the high-conductivity blade groove structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of electrode installation according to an embodiment of the present invention; Figure 3 This is a diagram of a semi-circular carbon removal device according to an embodiment of the present invention; Figure 4 This is a diagram of a V-shaped carbon removal device according to an embodiment of the present invention.

[0019] Wherein: 1-Semi-circular groove; 2-Long straight groove; 3-V-shaped groove; 4-Machine tool connection part; 5-Electrode; 6-Electrode mounting device; 7-Inlet pipe; 8-Pipe fixing device; 9-External outlet pipe; 10-Internal outlet pipe; 11-Scrubbing medium; 12-External outlet of flushing medium; 13-Internal outlet of flushing medium. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: High-pressure guide vane assembly slot dimensions and surface quality requirements like Figure 1 As shown, the high-conductivity blade groove structure includes a semi-circular groove 1 with a groove dimension requirement of R9mm and a surface roughness requirement of Ra6.3μm; a long straight groove 2 with a groove width of 1.2mm, a groove depth of 3.25mm, and a groove length of approximately 36mm, and a surface roughness requirement of Ra6.3μm; and a V-shaped groove 3 with a groove width of 0.7mm, a groove depth of 3.75mm, and a groove length of approximately 12mm, and a surface roughness requirement of Ra6.3μm. No carbon buildup is allowed after electrical discharge machining (EDM) of any of the groove structures.

[0027] See Figures 2-4 This application discloses a device for removing carbon deposits from electrical discharge machining (EDM). The device comprises an electrode mounting device 6 and a pipeline fixing device 8. The electrode mounting device 6 is connected to a machine tool via a machine tool connection part 4, and an electrode 5 adapted to the workpiece is fixed on the electrode mounting device 6. The pipeline fixing device 8 is fixed to the machine tool, and an inlet pipeline 7 is fixed on the pipeline fixing device 8. An internal outlet pipeline 10 and an external outlet pipeline 9 are detachably connected to the inlet pipeline 7. The internal outlet pipeline 10 and the external outlet pipeline 9 are positioned close to the electrode 5 for flushing the electrode 5 and the workpiece. This invention effectively solves the problems of short circuits, surface burns, and quality defects caused by carbon deposits in complex groove types such as semi-circular grooves, V-grooves, and long straight grooves of high-conductivity blades during EDM by providing a dedicated carbon removal device and method. This device can flexibly design corresponding internal and external outlet pipelines for different machining structures and material characteristics, achieving efficient and directional carbon flushing and removal, significantly improving the consistency of part machining dimensions and surface integrity, and enabling it to meet stringent acceptance standards. Meanwhile, its flushing method has universal applicability, and the device structure has good replaceability and adaptability, providing a universal and reliable technical means to solve the problem of carbon buildup in narrow-slot EDM of high-temperature alloys.

[0028] In some embodiments, the shape of the electrode 5 is adapted to the workpiece to be processed, including V-shape and semi-circular shape.

[0029] In some embodiments, the internal outlet pipe 10, the external outlet pipe 9, and the inlet pipe 7 are connected by threads.

[0030] In some embodiments, such as Figure 2 As shown, the electrode is installed in the machine tool connection part 4, the electrode 5, and the electrode mounting device 6. The electrode mounting device 6 is connected to the machine tool via the machine tool connection part 4 and is used to fix the electrode 5. The shape of the electrode 5 is designed according to the groove type and groove size, and is used to process different sizes of semi-circular, V-shaped, long straight, and other groove structures of high-pressure guide vane assemblies. Figure 3 As shown, the carbon removal device includes an inlet pipe 7, a pipe fixing device 8, a semi-circular external outlet pipe 9, a semi-circular internal outlet pipe 10, a flushing medium 11, an external outlet 12 for the flushing medium, and an internal outlet 13 for the flushing medium. The internal outlet pipe 10, the external outlet pipe 9, and the inlet pipe 7 are connected by threads, facilitating the replacement of internal outlet pipes 10 and external outlet pipes 9 with different shapes and sizes. Figure 4 As shown, the carbon removal device includes an inlet pipe 7, a pipe fixing device 8, an external outlet pipe 9 (V-shaped structure), an internal outlet pipe 10 (V-shaped structure), a flushing medium 11, an external outlet of the flushing medium 12, and an internal outlet of the flushing medium 13. The internal outlet pipe 10, the external outlet pipe 9, and the inlet pipe 7 are connected by threads, facilitating the replacement of internal outlet pipes 10 and external outlet pipes 9 with different shapes and sizes.

[0031] In some embodiments, the inlet pipe 7 is used for the inflow of flushing medium 11, and the pipe diameter of the inlet pipe 7 is 8 mm and the inlet pressure is 0.2 MPa.

[0032] More preferably, the scouring medium 11 is electrical discharge oil.

[0033] In some embodiments, an external outlet 12 for flushing medium is provided on the external outlet pipe 9 near the workpiece to be processed. The external outlet 12 for flushing medium consists of a number of holes evenly distributed on the external outlet pipe 9, with the holes facing downwards at a 45-degree angle to the horizontal.

[0034] In some embodiments, an internal outlet 13 for flushing medium is provided on the internal outlet pipe 10 near the workpiece to be processed. The internal outlet 13 for flushing medium is a hole evenly distributed on the internal outlet pipe 10, and the hole is oriented at an angle downwards at a 45-degree offset from the horizontal direction.

[0035] In some embodiments, the shapes of the internal outlet pipe 10 and the external outlet pipe 9 are adapted to the workpiece to be processed, including oblique elongated type and semi-circular type.

[0036] In some embodiments, the flushing medium 11 uses EDM oil; the inlet pipe 7 is used for the inflow of the flushing medium 11, the inlet pipe 7 has a diameter of 8 mm and an inlet pressure of 0.2 MPa; the internal outlet pipe 10 is used for the outflow of the flushing medium 11, the internal outlet pipe 10 has a diameter of 4 mm; the external outlet pipe 9 is used for the outflow of the flushing medium 11, the external outlet pipe 9 has a diameter of 6 mm; the flushing medium internal outlet 13 hole is used for flushing the interior of the semi-circular, V-shaped, and long straight electrodes and The internal outlet pipe 10 near the electrode side of the component has a number of holes evenly distributed on its wall. The holes are oriented at a 45-degree angle downwards from the horizontal direction, with a diameter of φ1mm and a spacing of 1.5mm. The external outlet 12 holes of the flushing medium are used to flush the exterior of the semi-circular, V-shaped, and long straight electrodes and the component. The external outlet pipe 9 near the electrode side has a number of holes evenly distributed on its wall. The holes are oriented at a 45-degree angle downwards from the horizontal direction, with a diameter of φ1mm and a spacing of 1.5mm.

[0037] This application also discloses a method for removing carbon deposits from electrical discharge machining, comprising: The electrode 5 is installed on the EDM machine tool, and the device for removing carbon deposits from EDM is fixed on the EDM machine tool above the workpiece to be processed, so that the inner outlet pipe 10 is 2mm away from the electrode 5 and the outer outlet pipe 9 is 1mm away from the electrode 5. When finishing the workpiece, the device for removing carbon deposits from EDM is turned on, and the flushing medium 11 enters the external outlet pipe 9 and the internal outlet pipe 10 through the inlet pipe 7. The flushing medium in the external outlet pipe 9 flushes the outside of the electrode 5 and the workpiece, while the flushing medium 11 in the internal outlet pipe 10 flushes the inside of the electrode 5 and the workpiece.

[0038] In some embodiments, a semi-circular electrode 5 is mounted on an electrical discharge machine tool, and a device for removing carbon deposits from electrical discharge machining is fixed on the electrical discharge machine tool above the workpiece to be processed, such that the inner outlet pipe 10 of the semi-circular inner outlet pipe 10 is 2 mm away from the electrode 5, and the outer outlet pipe 9 is 1 mm away from the electrode 5. When finishing the semi-circular groove 1 of the workpiece, the device for removing carbon deposits from electrical discharge machining is turned on, and the flushing medium 11 enters the external outlet pipe 9 and the internal outlet pipe 10 through the inlet pipe 7 respectively. The flushing medium in the external outlet pipe 9 flushes the outside of the semi-circular electrode 5 and the semi-circular groove 1, and the flushing medium 11 in the internal outlet pipe 10 flushes the inside of the semi-circular electrode 5 and the semi-circular groove 1. Disassemble the semi-circular internal outlet pipe 10 and replace it with an obliquely long internal outlet pipe 10; replace the electrode 5 with a V-shaped electrode 5, and repeat the above steps to machine the V-shaped groove of the workpiece.

[0039] In some embodiments, a semi-circular electrode is mounted on an EDM machine and fixed using an electrode fixing device; the lower ends of the upper and lower edge plates are fixed on a fixture, and the gap between each positioning point is checked to be less than 0.03 mm; a semi-circular carbon removal device is mounted on the fixture, located 2 mm above the semi-circular groove of the part, with the inner outlet pipe 10 being 2 mm from the electrode 5 and the outer outlet pipe 9 being 1 mm from the electrode 5.

[0040] During the finishing of the semi-circular groove, the device is opened, and the flushing medium 11 enters the external outlet pipe 9 and the internal outlet pipe 10 along the inlet pipe 7. The flushing medium in the external outlet pipe 9 is sprayed out from the external outlet hole, flushing the outside of the semi-circular electrode and the semi-circular groove of the high-conductivity blade; the flushing medium 11 in the internal outlet pipe 10 is sprayed out from the internal outlet hole, flushing the inside of the semi-circular electrode and the semi-circular groove of the high-conductivity blade.

[0041] Disassemble the semi-circular inner and outer outlet pipes, and install the obliquely long inner and outer outlet pipes on the inlet pipe through threaded connection.

[0042] Install the V-shaped electrode on the EDM machine tool and fix it using the electrode fixing device; fix the lower end of the upper and lower edge plates on the fixture and check that the gap between each positioning point is less than 0.03mm; install the V-shaped carbon removal device on the fixture, located 2mm above the V-groove of the part, with the internal outlet pipe 2mm from the electrode and the external outlet pipe 1mm from the electrode.

[0043] During the finishing of the V-groove, the device is opened, and the flushing medium enters the external outlet pipe and the internal outlet pipe respectively through the inlet pipe. The flushing medium in the external outlet pipe is sprayed out from the external outlet hole, flushing the outside of the V-shaped electrode and the V-groove of the high-conductivity blade; the flushing medium in the internal outlet pipe is sprayed out from the internal outlet hole, flushing the inside of the V-shaped electrode and the V-groove of the high-conductivity blade.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An apparatus for removing carbon deposits from electrical discharge machining, characterized in that, include: Electrode mounting device (6) and pipeline fixing device (8). Electrode mounting device (6) is connected to machine tool via machine tool connection part (4). Electrode (5) adapted to workpiece is fixed on electrode mounting device (6). Pipeline fixing device (8) is fixed on machine tool. Inlet pipeline (7) is fixed on pipeline fixing device (8). Inlet pipeline (7) is detachably connected to internal outlet pipeline (10) and external outlet pipeline (9). Internal outlet pipeline (10) and external outlet pipeline (9) are set close to electrode (5) for flushing electrode (5) and workpiece.

2. The apparatus for removing carbon deposits from electrical discharge machining according to claim 1, characterized in that, The shape of the electrode (5) is adapted to the workpiece to be processed, including V-shaped and semi-circular shapes.

3. The apparatus for removing carbon deposits from electrical discharge machining according to claim 1, characterized in that, The internal outlet pipe (10), external outlet pipe (9), and inlet pipe (7) are connected by threads.

4. The apparatus for removing carbon deposits from electrical discharge machining according to claim 1, characterized in that, The inlet pipe (7) is used for the inflow of flushing medium (11). The pipe diameter of the inlet pipe (7) is 8mm and the inlet pressure is 0.2Mpa.

5. The apparatus for removing carbon deposits from electrical discharge machining according to claim 4, characterized in that, The scouring medium (11) is EDM oil.

6. The apparatus for removing carbon deposits from electrical discharge machining according to claim 1, characterized in that, On the external outlet pipe (9), near the workpiece to be processed, there is an external outlet (12) for flushing medium. The external outlet (12) for flushing medium consists of a number of holes evenly distributed on the external outlet pipe (9), with the holes facing downwards at a 45-degree angle to the horizontal.

7. The apparatus for removing carbon deposits from electrical discharge machining according to claim 1, characterized in that, On the internal outlet pipe (10), near the workpiece to be processed, there is an internal outlet (13) for flushing medium. The internal outlet (13) for flushing medium is a hole evenly distributed on the internal outlet pipe (10), and the hole is oriented 45 degrees downwards along the horizontal direction.

8. The apparatus for removing carbon deposits from electrical discharge machining according to claim 1, characterized in that, The shapes of the internal outlet pipe (10) and the external outlet pipe (9) are adapted to the workpiece to be processed, including oblique elongated type and semi-circular type.

9. A method for removing carbon deposits from electrical discharge machining, characterized in that, Implemented using the apparatus according to any one of claims 1 to 8, comprising: Install the electrode (5) on the EDM machine tool, fix the device for removing carbon deposits from EDM on the EDM machine tool above the workpiece, so that the inner outlet pipe (10) is 2mm away from the electrode (5) and the outer outlet pipe (9) is 1mm away from the electrode (5). When finishing the workpiece, the device for removing carbon deposits from EDM is turned on, and the flushing medium (11) enters the external outlet pipe (9) and the internal outlet pipe (10) respectively through the inlet pipe (7). The flushing medium in the external outlet pipe (9) flushes the outside of the electrode (5) and the workpiece, and the flushing medium (11) in the internal outlet pipe (10) flushes the inside of the electrode (5) and the workpiece.

10. A method for removing carbon deposits from electrical discharge machining according to claim 9, characterized in that, The shape of the electrode (5) is adapted to the workpiece to be processed, including V-shaped and semi-circular shapes; the shapes of the internal outlet pipe (10) and the external outlet pipe (9) are adapted to the workpiece to be processed, including oblique elongated and semi-circular shapes, and thus include: Install the semi-circular electrode (5) on the EDM machine tool, and fix the device for removing carbon deposits from EDM on the EDM machine tool above the workpiece to be processed, so that the inner outlet pipe (10) of the semi-circular inner outlet pipe (10) is 2mm away from the electrode (5) and the outer outlet pipe (9) is 1mm away from the electrode (5). When finishing the semi-circular groove (1) of the workpiece, the device for removing carbon deposits from EDM is turned on, and the flushing medium (11) enters the external outlet pipe (9) and the internal outlet pipe (10) respectively through the inlet pipe (7). The flushing medium in the external outlet pipe (9) flushes the outside of the semi-circular electrode (5) and the semi-circular groove (1), and the flushing medium (11) in the internal outlet pipe (10) flushes the inside of the semi-circular electrode (5) and the semi-circular groove (1). Remove the semi-circular internal outlet pipe (10) and replace it with a long, slanted internal outlet pipe (10); replace the electrode (5) with a V-shaped electrode (5), and repeat the above steps to process and finish the V-groove of the workpiece.

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