A high-efficiency liquid-flushing composite electrode for electrospark machining

Abstract

The present invention relates to the field of composite electrodes and discloses an efficient liquid-flushing electrospark machining composite electrode, comprising a main body, wherein the main body is composed of an electrode connecting rod, an electrode protective sleeve and an electrode, the electrode connecting rod and the electrode protective sleeve are assembled together, the electrode is assembled inside the electrode protective sleeve, a cavity one and a cavity two for flowing working fluid are provided on the electrode connecting rod, the cavity one and the cavity two are kept in communication, a cavity three is provided at a position of the electrode corresponding to the cavity two, a flow channel one is provided on the electrode and is in communication with the cavity three, a gap between the electrode and the electrode protective sleeve forms a flow channel two, and a center hole is provided in the middle area of ​​the cavity three. The efficient liquid-flushing electrospark machining composite electrode can effectively improve the liquid-flushing effect of electrospark milling, increase the electrode life, maintain the electrode shape, realize efficient removal of metal materials, improve production efficiency, reduce processing costs, effectively remove electro-processing erosion products, and improve the surface quality of the machined parts.

Description

Technical Field

[0001] The invention relates to the field of composite electrodes, in particular to a high-efficiency liquid-flushing electrospark machining composite electrode. Background Art

[0002] Effective flushing fluid is very important in EDM, and is also particularly important in EDM milling. Flushing fluid is usually divided into internal and external flushing fluids. The internal flushing fluid passes through the center hole of the electrode to flush the eroded material generated by the discharge away from the discharge zone. The external flushing fluid flows along the guide sleeve along the outer wall of the electrode or through an external nozzle to direct the coolant toward the discharge machining zone. Only a small part of the flushing capacity of the above-mentioned external flushing fluid can reach the discharge zone, so the effect of removing the eroded material is limited. In addition, when graphite is used as the tool electrode for EDM milling, due to the relatively soft physical properties of graphite material, the cylindrical surface features near the end of the electrode are easily scratched by the workpiece material or metal particles adhering to the workpiece surface, which not only affects the processed shape, but also reduces the service life of the electrode. For this reason, we propose an EDM composite electrode with efficient flushing fluid. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In view of the deficiencies in the prior art, the present invention provides a high-efficiency liquid-flushing EDM composite electrode to solve the above-mentioned problems.

[0005] (2) Technical solution

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-efficiency liquid-flushing electrospark machining composite electrode, comprising a main body, the main body consisting of an electrode connecting rod, an electrode protective sleeve and an electrode, the electrode connecting rod and the electrode protective sleeve being assembled together, the electrode being assembled inside the electrode protective sleeve, the electrode connecting rod being provided with cavity one and cavity two for flowing working fluid, cavity one and cavity two being connected, a cavity three being provided at the position of the electrode corresponding to cavity two, a flow channel one being provided on the electrode and being connected to cavity three, a space between the groove on the electrode and the inner wall of the electrode protective sleeve forming flow channel two, a center hole being provided in the middle area of ​​cavity three, during the working discharge process after the composite electrode and the workpiece are energized, the working fluid with a certain pressure enters cavity three of the electrode through cavity one and cavity two in the electrode connecting rod, and then passes through flow channel one, the working fluid shown by the dotted line flows out through flow channel two, and another liquid flows out through the center hole of the electrode.

[0007] Preferably, each flow channel 2 is connected to each flow channel 1 respectively, and flow channel 2 and flow channel 1 can be evenly distributed or unevenly distributed. Flow channel 2 and flow channel 1 are odd numbers of one, three, five or even numbers of two, four, six, or more.

[0008] Preferably, the flow channel 2 and the odd or even number of the flow channel 2 can also be changed along the axial direction as needed, such as the front half is an even number and the back half is an odd number.

[0009] Preferably, the second flow channel is a straight flow channel parallel to the center line of the electrode or a spiral flow channel with an angle along the center line. When the second flow channel forms an angle with the electrode axis, the flushing direction is consistent with the rotation direction of the electrode, so the flushing effect will be further improved.

[0010] Preferably, the cross-sectional shapes and sizes of flow channel 1 and flow channel 2 may be the same or different.

[0011] Preferably, the material of the electrode may be graphite or copper-tungsten alloy, and the material of the electrode protection sleeve may be copper or alloy or other conductive materials.

[0012] Preferably, the center point of the electrode center hole and the axis of the electrode are on the same line or the center point of the electrode center hole and the axis of the electrode are eccentric.

[0013] Preferably, a protrusion is provided at the lower end of the electrode connecting rod, and an external thread is provided on the outer wall surface of the protrusion. A connecting threaded hole is provided in the protrusion area corresponding to the electrode. The protrusion and the connecting threaded hole are threadedly connected together, and the connecting threaded hole is connected to the cavity in three ways. The upper end of the electrode protective cover is pressed by the electrode connecting rod and the electrode.

[0014] Preferably, when the electrode end of the electrode loses cavity three times, a new electrode with an electrode protective sleeve can be replaced.

[0015] Preferably, a centering shoulder is provided on the inner wall of the connecting threaded hole, and a protruding area is provided in the area of ​​the electrode connecting rod corresponding to the centering shoulder. The centering shoulder fits in the protruding area to ensure the coaxiality of the electrode connecting rod and the electrode.

[0016] Preferably, the cavity one and cavity two may be one cavity.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the present invention provides a high-efficiency liquid-flushing EDM composite electrode, which has the following beneficial effects:

[0019] 1. This high-efficiency flushing EDM composite electrode can effectively improve the flushing effect of EDM milling, increase electrode life, maintain electrode shape, achieve efficient removal of metal materials, improve production efficiency, reduce processing costs, effectively remove electro-processing erosion materials, and improve the surface quality of parts being processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 for Figure 1 AA cross-sectional view in FIG;

[0022] Figure 3 for Figure 2 A partial cross-sectional schematic diagram in FIG.

[0023] Figure 4 for Figure 3 The CC cross-sectional view in FIG.

[0024] Figure 5 Schematic cross-sectional view of the electrode structure of the present invention.

[0025] In the figure: 1. main body; 101. centering shoulder; 102. connecting threaded hole; 2. electrode connecting rod; 3. electrode protective cover; 4. electrode; 401. cavity one; 402. cavity two; 403. cavity three; 404. flow channel one; 405. flow channel two; 406. electrode end; 407. upper end. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-4 A high-efficiency flushing electrospark machining composite electrode includes a main body 1, which is composed of an electrode connecting rod 2, an electrode protective sleeve 3 and an electrode 4. The electrode connecting rod 2 and the electrode protective sleeve 3 are assembled together, and the electrode 4 is assembled inside the electrode protective sleeve 3. The electrode connecting rod 2 is provided with a cavity 1 401 and a cavity 2 402 for flowing working fluid. The cavity 1 401 and the cavity 2 402 are kept in communication. The electrode 4 is provided with a cavity 3 403 at a position corresponding to the cavity 2 402. The electrode 4 is provided with a cavity 404. The flow channel 1 404 is connected to the three 403, and the space between the groove on the electrode 4 and the inner wall of the electrode protective sleeve 3 forms a flow channel 2 405. A central hole is opened in the middle area of ​​the cavity 3 403. During the working discharge process after the composite electrode and the workpiece are energized, the working fluid with a certain pressure enters the cavity 3 403 of the electrode 4 through the cavity 1 401 and the cavity 2 402 in the electrode connecting rod 2, and then passes through the flow channel 1 404. The working fluid shown by the dotted line flows out through the flow channel 2 405, and another liquid flows out through the central hole of the electrode 4.

[0028] Each second flow channel 405 is connected to each first flow channel 404 respectively. The second flow channel 405 and the first flow channel 404 can be evenly distributed or unevenly distributed. The number of the second flow channel 405 and the first flow channel 404 can be an odd number of one, three, five or an even number of two, four, six, or more.

[0029] The second flow channel 405 and the odd or even number of the second flow channel 405 can also be changed along the axial direction as needed, such as the front half can be an even number and the back half can be an odd number.

[0030] The second flow channel 405 is a straight flow channel parallel to the center line of the electrode 4 or a spiral flow channel with an angle along the center line. When the second flow channel 405 forms an angle with the axis of the electrode 4, the flushing direction is consistent with the rotation direction of the electrode 4, so the flushing effect will be further improved.

[0031] The cross-sectional shapes and sizes of the flow channel 1 404 and the flow channel 2 405 may be the same or different.

[0032] The material of the electrode 4 can be graphite or copper-tungsten alloy, and the material of the electrode protection cover 3 can be copper or alloy or other conductive materials.

[0033] The center point of the center hole of the electrode 4 and the axis of the electrode 4 are on the same line or the center point of the center hole of the electrode 4 and the axis of the electrode 4 are eccentric.

[0034] The lower end of the electrode connecting rod 2 is provided with a protrusion, and the outer wall surface of the protrusion is provided with an external thread. The electrode 4 is provided with a connecting threaded hole 102 corresponding to the protrusion area. The protrusion and the connecting threaded hole 102 are threadedly connected together. The connecting threaded hole 102 is connected to the cavity three 403. The upper end portion 407 of the electrode protective sleeve 3 is pressed by the electrode connecting rod 2 and the electrode 4.

[0035] When the electrode end 406 of the electrode 4 wears out the cavity 3 403 , a new electrode 4 with an electrode protection sleeve 3 can be replaced.

[0036] A centering shoulder 101 is provided on the inner wall of the connecting threaded hole 102 , and a protruding area is provided on the electrode connecting rod 2 corresponding to the centering shoulder 101 . The centering shoulder 101 fits in the protruding area to ensure the coaxiality of the electrode connecting rod 2 and the electrode 4 .

[0037] When the electrode 4 and the workpiece are working and discharging, the electrode end 406 will be continuously consumed together with the electrode protection sleeve 3 as the discharge progresses, while the shape of the outlet of the flow channel 2 405 between the electrode 4 and the electrode protection sleeve 3 participating in the discharge always remains stable, thereby ensuring that the working fluid pressure and flow rate at the outlet of the flow channel 2 405 do not change with the loss of the electrode. When the electrode 4 and the workpiece are discharging, etching products will be generated. The flushing liquid with a certain pressure can effectively carry away the etching products in the discharge area, thereby reducing the short circuit between the electrode 4 and the workpiece caused by the etching products and improving the material removal efficiency.

[0038] Working principle: During the working discharge process after the composite electrode and the workpiece are energized, the working fluid with a certain pressure enters the cavity 3 403 of the electrode 4 through the cavity 1 401 and the cavity 2 402 in the electrode connecting rod 2, and then passes through the flow channel 1 404. The working fluid shown by the dotted line flows out through the flow channel 2 405, and another liquid flows out through the center hole of the electrode 4.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency liquid-flushing electrospark machining composite electrode, comprising a main body (1), characterized in that: The main body (1) is composed of an electrode connecting rod (2), an electrode protective sleeve (3) and an electrode (4). The electrode connecting rod (2) and the electrode protective sleeve (3) are assembled together, and the electrode (4) is assembled inside the electrode protective sleeve (3). The electrode connecting rod (2) is provided with a cavity 1 (401) and a cavity 2 (402) for flowing working fluid. Cavity 1 (401) and cavity 2 (402) are kept in communication. A cavity 3 (403) is provided at a position of the electrode (4) corresponding to cavity 2 (402). The electrode (4) is provided with a flow channel connected to cavity 3 (403). Channel 1 (404), the space between the groove on the electrode (4) and the inner wall of the electrode protective sleeve (3) forms flow channel 2 (405), a central hole is opened in the middle area of ​​cavity 3 (403), each of the flow channels 2 (405) is connected with each flow channel 1 (404), flow channel 2 (405) and flow channel 1 (404) are evenly distributed or unevenly distributed, flow channel 2 (405) and flow channel 1 (404) are odd numbers of one, three, five or even numbers of two, four, six, and flow channel 2 (405) is a straight flow channel parallel to the center line of the electrode (4) or a spiral flow channel with an angle along the center line.

2. The high-efficiency liquid-flushing EDM composite electrode according to claim 1, characterized in that: The material of the electrode (4) is graphite or copper-tungsten alloy, and the material of the electrode protection sleeve (3) is copper or alloy.

3. The high-efficiency liquid-flushing EDM composite electrode according to claim 1, characterized in that: The center point of the center hole of the electrode (4) and the axis of the electrode (4) are on the same line, or the center point of the center hole of the electrode (4) and the axis of the electrode (4) are eccentric.

4. The high-efficiency liquid-flushing EDM composite electrode according to claim 1, characterized in that: The lower end of the electrode connecting rod (2) is provided with a protrusion, and the outer wall surface of the protrusion is provided with an external thread. The electrode (4) is provided with a connecting threaded hole (102) corresponding to the protrusion area. The protrusion and the connecting threaded hole (102) are threadedly connected together. The connecting threaded hole (102) is connected to the cavity three (403). The upper end portion (407) of the electrode protective sleeve (3) is pressed by the electrode connecting rod (2) and the electrode (4).

5. The high-efficiency liquid-flushing EDM composite electrode according to claim 4, characterized in that: A centering shoulder (101) is provided on the inner wall of the connecting threaded hole (102), and a protruding area is provided on the electrode connecting rod (2) in an area corresponding to the centering shoulder (101), and the centering shoulder (101) fits in the protruding area.

6. The high-efficiency liquid-flushing EDM composite electrode according to claim 1, characterized in that: The cavity one (401) and cavity two (402) are one cavity.

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