In-line electrode deep hole electrolytic electrospark machining device and machining method

Abstract

The application discloses an inlaid electrode deep hole electrolytic electric spark processing device and a processing method. The device comprises a working power source, an electrode feeding unit, an electrode rotating unit, an inlaid electrode, an auxiliary electrode, an electrolyte tank, a processing tank and an electrolyte supply system. The electrolyte supply system supplies electrolyte in the electrolyte tank to the inlaid electrode. The inlaid electrode is arranged on the electrode rotating unit and is driven to rotate by the electrode rotating unit. The electrode rotating unit is arranged on the electrode feeding unit and is driven by the electrode feeding unit to drive the inlaid electrode to make lifting motion relative to a workpiece. The inlaid electrode comprises an insulating electrode tube, a wire and a tool electrode. The wire is arranged in the insulating electrode tube and is connected with the working power source negative pole at one end and with the tool electrode at the other end. The insulating electrode tube is provided with an electrolyte injection hole, and one end of the insulating electrode tube is communicated with the electrolyte supply system and the other end is connected with the tool electrode. The auxiliary electrode is connected with the working power source positive pole. The method adopts the device to process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of processing of insulating hard and brittle materials, and particularly to a deep hole electrolytic electro-spark processing device with embedded electrodes and a processing method. BACKGROUND

[0002] Electrolytic electro-spark processing is a relatively new technology in the field of special processing, which is suitable for processing insulating hard and brittle materials such as heat-resistant glass, ceramics, industrial diamond, quartz, etc. Electrolytic electro-spark processing is a non-contact processing technology based on electrochemical corrosion and discharge effect around the tool electrode. This processing technology uses conductive electrolyte solution as working fluid. The tool electrode is connected to the negative electrode, and the auxiliary electrode immersed in the electrolyte is connected to the positive electrode. After a voltage is applied between the positive and negative electrodes, a hydrogen gas film will be formed on the surface of the tool electrode. When the voltage exceeds the breakdown voltage of the gas film, the gas film will be broken down and discharge occurs. The workpiece material is removed by the high temperature of the discharge arc column and the explosion at the end of the discharge, achieving the purpose of processing.

[0003] In electrolytic electro-spark processing, the formation of a stable gas film on the surface of the tool electrode is a necessary condition for the discharge processing to proceed. The geometric, physical and dynamic properties of the gas film have an important influence on the processing process. However, the formation of the gas film depends on the full contact between the electrolyte and the tool electrode. However, as the hole processing depth increases, spark discharge becomes unpredictable, making it difficult to obtain good geometric shape and high processing speed. One of the main reasons is that it is difficult for the electrolyte to flow into the small gap between the tool electrode and the workpiece when the hole depth increases. For this reason, many researchers have made many explorations on how to improve the flow of electrolyte between the two. For example: magnetic fluid assisted processing can improve the flow ability of the electrolyte, improve the processing accuracy and efficiency; ultrasonic vibration assisted processing is beneficial to promote the flow of electrolyte between the tool electrode and the workpiece, thereby realizing stable and continuous discharge and improving the depth of electrolytic electro-spark drilling; using the method of processing the workpiece and the tool electrode upside down is beneficial to the accumulation of the gas film under the action of buoyancy to the electrode end, promoting the end discharge, which can effectively improve the processing efficiency.

[0004] In the aforementioned studies on electrolytic electrical discharge machining (EDM), regardless of the improvement methods employed, a recurring phenomenon occurs: bubbles, driven by buoyancy, always move upwards, escaping the machining area and gradually increasing in size during this upward movement. This results in bubbles constantly being lost within the machining area, making it difficult to retain them at the electrode tip where bubbles are most needed. Consequently, discharge occurs primarily on the electrode side, leading to the phenomenon reported in many studies where machining is "neither deep enough nor deep enough, and produces a large taper and flared opening." Furthermore, since current machining processes utilize monolithic metal electrodes, as machining depth increases, the electrode length in contact with the electrolyte increases, increasing the bubble generation area and reducing discharge energy. Simultaneously, it induces discharge across the entire electrode surface immersed in the electrolyte, with a weakened discharge at the electrode tip, further amplifying the "taper and flared opening" phenomenon in the machined hole. Due to gravity, some of the machining debris generated by the discharge remains in the machining gap, making chip removal more difficult the deeper the hole. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing electrolytic discharge machining (EDM) for insulating and brittle materials by proposing an embedded electrode deep-hole EDM apparatus and method. When using this apparatus, the electrolyte supplied through the inclined hole during the initial stage of EDM prevents the escape of air bubbles from the tool electrode surface, which is beneficial for the stable formation of the gas film. Furthermore, when the machining hole depth is large, sufficient electrolyte can be provided between the deep-hole electrodes to ensure the stable formation of the gas film on the tool electrode surface, ultimately facilitating deep-hole machining of insulating and brittle materials.

[0006] This invention is achieved through the following technical solution:

[0007] An embedded electrode deep hole electrolytic electrical discharge machining apparatus includes: a working power supply, an electrode feeding unit, an electrode rotation unit, an embedded electrode, an auxiliary electrode, an electrolyte tank, a machining tank, and an electrolyte supply system.

[0008] The electrolyte supply system is used to supply the electrolyte in the electrolyte tank to the embedded electrode; the embedded electrode is disposed on the electrode rotating unit and driven to rotate by it; the electrode rotating unit is disposed on the electrode feeding unit and driven by it, thereby causing the embedded electrode to move up and down relative to the workpiece to be processed.

[0009] The inner-embedded electrode comprises an insulated electrode tube, a wire and a tool electrode; the wire is arranged in the insulated electrode tube; the insulated electrode tube is provided with a plurality of electrolyte injection holes, one end of the insulated electrode tube is communicated with the electrolyte supply system, and the other end is connected with the tool electrode; one end of the wire is connected with the negative pole of the working power supply, and the other end is connected with the tool electrode; the auxiliary electrode is connected with the positive pole of the working power supply.

[0010] Specifically, the wire in the application is provided with an insulation protective layer, is arranged in the interior of the insulated electrode tube, one end of the wire is connected with the tool electrode, and the other end is connected with the negative pole of the working power supply through the electrode rotating unit.

[0011] Further, the inner-embedded electrode deep hole electrolytic electrospark machining device further comprises a sliding block and a guide block; the sliding block is arranged on the electrode feeding unit and is driven to slide by the electrode feeding unit; the electrode rotating unit is fixedly arranged on the sliding block; the guide block is arranged on the sliding block, and one end of the insulated electrode tube penetrates through the guide block and is connected to the electrode rotating unit.

[0012] Further, the inner-embedded electrode deep hole electrolytic electrospark machining device further comprises a liquid supply pipe; two ends of the liquid supply pipe are respectively communicated with the insulated electrode tube and the electrolyte supply system.

[0013] Further, the inner-embedded electrode deep hole electrolytic electrospark machining device is characterized in that the material of the insulated electrode tube is selected from polytetrafluoroethylene, epoxy resin, epoxy glass fiber, quartz glass or stainless steel with an insulation layer on the surface.

[0014] Specifically, the insulated electrode tube used in the application can avoid the discharge phenomenon between the side surface of the inner-embedded electrode and the hole wall during deep hole machining, thereby avoiding the phenomenon that the deep hole machining by electrolytic electrospark machining cannot be deepened and a large taper and trumpet mouth are generated.

[0015] Further, the inner-embedded electrode deep hole electrolytic electrospark machining device is characterized in that the tool electrode is arranged in a "convex" structure, and the convex part of the tool electrode is embedded in the interior of the insulated electrode tube; the material of the tool electrode is selected from any one of stainless steel, tungsten, tungsten copper, red copper and titanium alloy.

[0016] Specifically, the diameter of the upper end convex part of the tool electrode in the "convex" structure is designed to be the same as the inner diameter of the insulated electrode tube, so that the tool electrode can be embedded in the interior of the insulated electrode tube; meanwhile, the lower segment of the tool electrode in the "convex" structure is designed to be the same as the outer diameter of the insulated electrode tube.

[0017] Further, the embedded electrode deep hole electrolytic electro-spark machining device is characterized in that: a plurality of electrolyte injection holes are arranged around the circumference of the insulated electrode tube, and the electrolyte injection holes are arranged as inclined holes with an inclination angle of 10°-70°.

[0018] Specifically, the number of electrolyte injection holes is 2-6 and the electrolyte injection holes are uniformly distributed around the circumference of the insulated electrode tube. The electrolyte injection holes are arranged at a position about 2-10 mm away from the end of the insulated electrode tube, and the position of the electrolyte injection holes can be slightly higher than the upper end of the tool electrode by about 1-5 mm.

[0019] Further, the embedded electrode deep hole electrolytic electro-spark machining device is characterized in that: the rotating speed of the embedded electrode driven by the electrode rotating unit is 0-20000 rpm.

[0020] Further, the embedded electrode deep hole electrolytic electro-spark machining device is characterized in that: the flow rate of the electrolyte supplied by the electrolyte supply system into the insulated electrode tube is 0.1-15.0 L / min; and the concentration of the electrolyte is 1.0-40.0 wt%.

[0021] Preferably, the flow rate of the electrolyte should not be too large, otherwise the disappearance of bubbles will be caused, which is not conducive to the smooth progress of the machining.

[0022] Specifically, the electrolyte can be one of NaOH solution, KOH solution, Na2CO3 solution, NaCl solution or a two-by-two mixed solution of two of them.

[0023] Further, the embedded electrode deep hole electrolytic electro-spark machining device is characterized in that: the electrolyte tank is in communication with the machining tank, and the communication is controlled by a valve.

[0024] An embedded electrode deep hole electrolytic electro-spark machining method, which adopts the machining device described above, and the method is used to machine a deep hole on a workpiece to be machined, and the method comprises the following specific steps:

[0025] S1, preparation stage:

[0026] First, according to the size requirements of the deep hole, an embedded electrode with a suitable size is prepared, and one end of the embedded electrode is connected with the electrode rotating unit, and the embedded electrode is connected with the negative pole of the power supply through the wire therein; the auxiliary electrode is connected with the positive pole of the power supply;

[0027] The workpiece and the auxiliary electrode are immersed in the electrolyte in the machining tank, and the tool electrode is extended to the initial machining position of the deep hole of the workpiece;

[0028] S2, initial machining stage:

[0029] Turning on the working power, starting the electrode rotation unit to drive the embedded electrode to rotate, starting the electrolyte supply system to provide low flow rate electrolyte to the insulated electrode tube and to the machining end of the tool electrode through the electrolyte injection hole;

[0030] In the initial machining: the hole with certain depth has not been formed on the surface of the workpiece, at this time, there is enough electrolyte between the tool electrode and the workpiece, and a large number of bubbles will be generated on the surface of the tool electrode during machining, at this time, the bubbles will float and escape, and the low flow rate electrolyte flowing along the surface of the tool electrode can prevent the bubbles from floating and escaping, which is beneficial to the formation of the hydrogen gas film on the surface of the tool electrode, when the voltage exceeds the breakdown voltage of the gas film, the gas film will be broken down and discharge phenomenon occurs, the workpiece material is removed by the high temperature of the discharge arc column and the explosion effect at the end of the discharge, and the purpose of hole machining is achieved, and with the continuous machining, a hole with gradually increasing depth can be formed on the surface of the workpiece;

[0031] S3, deep hole machining stage:

[0032] With the increase of the machining hole depth, the flow rate of the electrolyte is increased, the electrolyte is provided between the tool electrode and the workpiece through the electrolyte injection hole on the inner wall of the insulated electrode tube (the electrolyte with large flow rate has certain impact force, and the electrolyte itself has gravity, which can break through the small gap between the side surface of the tool electrode and the hole wall, and reach between the machining end of the tool electrode and the bottom of the deep hole), so that the stable generation of the gas film on the surface of the tool electrode is ensured, and the electrode feeding unit is used to drive the tool electrode to feed;

[0033] S4, machining end:

[0034] After machining to the specified depth, the machining is stopped, the embedded electrode is retreated to the initial position by the electrode feeding unit, and the electrolyte supply and the embedded electrode rotation are stopped, and the deep hole machining is completed.

[0035] Advantages of the present application:

[0036] (1) In the embedded electrode deep hole electrochemical spark machining device designed in the present application, the surface of the insulated electrode tube has insulation, and the discharge phenomenon between the side surface of the embedded electrode and the hole wall can be avoided during deep hole machining, so that the phenomenon of "neither deepening nor generating large taper and horn mouth" during electrochemical spark machining can be avoided.

[0037] (2) The application provides a built-in electrode deep hole electrolytic electrospark machining device and method. In the initial machining stage of the deep hole, the low-flow electrolyte provided by the electrolyte injection hole arranged on the wall of the insulating electrode can prevent the bubbles on the surface of the tool electrode from floating and escaping, promote the stable formation of the gas film on the tool electrode, and be beneficial to the formation of spark discharge, so that the stability of the discharge machining can be effectively improved. In addition, the high-speed rotation of the built-in electrode is beneficial to the formation of a thin gas film on the surface of the tool electrode, so that the machining precision of the inlet of the deep hole can be improved.

[0038] (3) As the depth of the machined hole increases, the advantage of the built-in electrode deep hole electrolytic electrospark machining is more obvious. The electrolyte can be provided between the machining end of the tool electrode and the workpiece (the bottom of the deep hole) through the electrolyte injection hole arranged on the wall of the insulating electrode. Under the premise of ensuring the continuous supply of the electrolyte for the stable generation of the gas film, the fine debris generated during the machining of the tool electrode can be effectively discharged from the deep hole under the double action of the reciprocating motion of the electrode feeding unit and the electrolyte flushing, which is beneficial to the stability of the deep hole machining process.

[0039] (4) The built-in electrode deep hole electrolytic electrospark machining method of the application benefits from the use of the insulating electrode pipe. Although the insulating electrode pipe is also immersed in the electrolyte, it is made of insulating material, and the outer wall does not undergo electrolysis, so that the spark discharge phenomenon on the side of the built-in electrode can be avoided, and the side wall precision and overall forming quality of the deep hole machining can be effectively improved.

[0040] (5) The built-in electrode deep hole electrolytic electrospark machining device designed by the application can supply electrolyte to the bottom of the deep hole during the deep hole machining process, which can effectively improve the machining efficiency, improve the forming precision of the deep hole machining, and increase the depth-diameter ratio. The method for deep hole machining provided by the application can solve the problem of "not deep and large taper and horn mouth" existing in the existing electrolytic electrospark machining technology, realize high-quality and large-depth-diameter-ratio deep hole machining of insulating hard and brittle materials, and ensure the machining precision and forming quality of the deep hole. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0042] Fig. 1 The structure diagram of the built-in electrode deep hole electrolytic electrospark machining device designed by the application;

[0043] Fig. 2 Fig. 1 is a schematic diagram of the inner-embedded electrode and the workpiece during deep hole processing;

[0044] Fig. 3 Fig. 4 is a left view of the electrode feeding unit and the electrode rotating unit.

[0045] Fig. 1 is a schematic diagram of the inner-embedded electrode and the workpiece during deep hole processing; DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work under the premise of the present application, all belong to the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and do not necessarily be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0048] Example 1

[0049] As Figs. 1-3As shown, the embedded electrode deep hole electrolytic electro-spark machining device comprises a working power supply 1, an electrode feeding unit 2, an electrode rotating unit 3, an embedded electrode 4, an auxiliary electrode 5, an electrolyte tank 6, a machining tank 7, an electrolyte supply system 8, a sliding block 11, a guide block 12 and a liquid supply pipe 13; the electrolyte tank 6 is in communication with the machining tank 7 and is controlled by a valve 14 to be opened or closed;

[0050] The embedded electrode 4 comprises an insulated electrode tube 4-1, a wire 4-2 and a tool electrode 4-3 (the tool electrode is in a "convex" structure); the wire 4-2 is arranged in the insulated electrode tube 4-1, one end of the wire 4-2 is connected with the negative pole of the working power supply 1, and the other end is connected with the tool electrode 4-3; one end of the insulated electrode tube 4-1 is in communication with the electrolyte supply system 8 through the liquid supply pipe 13, and the other end is connected with the tool electrode 4-3; 2-6 electrolyte injection holes 4-1-1 are arranged around the circumference of the insulated electrode tube 4-1, and the electrolyte injection holes 4-1-1 are located about 1-5 mm above the tool electrode 4-1; the electrolyte injection holes 4-1-1 are arranged as downwardly inclined holes, and the angle between the holes and the vertical direction is 10-70°; the auxiliary electrode 5 is connected with the positive pole of the working power supply 1;

[0051] The electrolyte supply system 8 supplies the electrolyte 9 in the electrolyte tank 6 to the embedded electrode 4 (specifically to the insulated electrode tube 4-1) through the liquid supply pipe 13;

[0052] The sliding block 11 is arranged on the electrode feeding unit 2 and is driven to slide by the electrode feeding unit 2; the electrode rotating unit 3 and the guide block 12 are fixedly arranged on the sliding block 11; one end of the insulated electrode tube 4-1 penetrates through the guide block 12 and is connected with the electrode rotating unit 3 and is driven to rotate by the electrode rotating unit 3; the insulated electrode tube 4-1 (embedded electrode 4) is driven by the electrode feeding unit 2 to make lifting movement relative to the workpiece 10 to be machined.

[0053] Specifically, the material of the insulated electrode tube 4-1 in the above embodiment 1 can be polytetrafluoroethylene, epoxy resin, epoxy glass fiber, quartz glass or stainless steel with an insulating layer on the surface; the tool electrode 4-3 is arranged in a "convex" structure, and the convex part of the tool electrode 4-3 is embedded in the inside of the insulated electrode tube 4-1; the material of the tool electrode 4-3 can be any one of stainless steel, tungsten, tungsten copper, red copper or titanium alloy; the wire 4-2 is provided with an insulating protective layer; the working power supply 1 can be a pulse power supply or a direct current power supply.

[0054] Embodiment 2

[0055] The method is used for machining a deep hole 10-1 on a workpiece 10 to be machined, and comprises the following specific steps:

[0056] S1, preparation stage:

[0057] Firstly, according to the size requirement of the deep hole 10-1, an inlaid electrode 4 (insulating electrode tube 4-1) with a suitable size is prepared, and one end of the inlaid electrode 4 is connected with the electrode rotating unit 3, and the inlaid electrode 4 is connected with the negative pole of the power supply 1 through the wire 4-2 therein; the auxiliary electrode 5 is connected with the positive pole of the power supply 1;

[0058] The workpiece 10 and the auxiliary electrode 5 are immersed in the electrolyte 7 in the machining tank 7, and the tool electrode 4-3 is driven by the electrode feeding unit 2 to extend to the initial machining position of the deep hole 10-1 of the workpiece 10, and machining is started from the surface of the workpiece 10 to the specified hole depth;

[0059] S2, initial machining stage:

[0060] The power supply 1 is turned on, the electrode rotating unit 3 is started to drive the inlaid electrode 4 to rotate (the rotating speed is 0-20000 rpm, 0 represents that the inlaid electrode 4 can not rotate when no rotation machining is needed), and the electrolyte supply system 8 is started to provide low-flow (0.1-5.0 L / min) electrolyte into the insulating electrode tube 4-1 through the liquid supply pipe 13 and to the machining end of the tool electrode through the electrolyte injection hole;

[0061] In the initial machining stage: the surface of the workpiece 10 has not formed a hole with a certain depth, at this time, since the workpiece 10 and the auxiliary electrode 5 are immersed in the electrolyte 9, there is enough electrolyte between the tool electrode 4-3 and the workpiece 10, and a large amount of bubbles will be generated on the surface of the tool electrode 4-3 during machining, at this time, since the tool electrode 4-3 has not entered the machining hole, there is no small gap between the tool electrode and the hole wall, and therefore the bubbles on the surface of the tool electrode 4-3 can easily float and escape, and the low-flow electrolyte can prevent the bubbles from floating and escaping, and can help to form a hydrogen gas film on the surface of the tool electrode 4-3, when the voltage exceeds the breakdown voltage of the gas film, the gas film will be broken down and discharge occurs, and the explosion at the end of the discharge removes the workpiece material, so as to achieve the purpose of hole machining, and a gradually deepening hole can be formed on the surface of the workpiece 10 as the machining continues;

[0062] S3, deep hole machining stage:

[0063] With the increase of the machining hole depth, the embedded electrode 4 gradually extends into the hole, so the electrolyte supply flow rate (5.0-15.0 L / min) needs to be increased, and the electrolyte is provided between the tool electrode 4-3 and the workpiece 10 through the electrolyte injection hole 4-1-1 on the side wall of the insulating electrode tube 4-1 (specifically, the electrolyte with a larger flow rate has a certain impact force, and the gravity of the electrode liquid itself can make the electrolyte break through the small gap between the side of the tool electrode 4-3 and the hole wall, and reach between the machining end 4-3-1 of the tool electrode 4-3 and the bottom of the deep hole), which guarantees the stable generation of the gas film on the surface of the tool electrode 4-3, and at the same time, the electrode feeding unit 2 drives the tool electrode 4-3 to feed machining;

[0064] S4, machining is completed:

[0065] After machining to the specified depth, stop machining, drive the embedded electrode back to the initial position by the electrode feeding unit, stop the electrolyte supply and the rotation of the embedded electrode, and complete the deep hole machining.

[0066] The machining debris generated in the deep hole machining stage can be effectively discharged from the deep hole by the reciprocating motion of the embedded electrode 4 driven by the electrode feeding unit 2 and the impact of the electrolyte with a large flow rate, which is beneficial to the stability of the deep hole machining process.

[0067] Among them: the reciprocating motion of the embedded electrode 4 driven by the electrode feeding unit 2 can be regarded as the compression process of the air cylinder, and the negative pressure generated in the process of pressing down can discharge the fine debris from the gap between the side of the embedded electrode 4 and the hole wall.

[0068] The above is only used to explain the preferred embodiment of the present application, and is not used to limit the present application. Any obvious changes or variations derived from the technical solutions of the present application are still within the protection scope of the present application.

Claims

1. A method for deep-hole electrolytic electrical discharge machining with an embedded electrode, characterized in that, include: The system includes a power supply (1), an electrode feeding unit (2), an electrode rotating unit (3), an embedded electrode (4), an auxiliary electrode (5), an electrolyte tank (6), a processing tank (7), and an electrolyte supply system (8). The electrolyte supply system (8) supplies the electrolyte (9) in the electrolyte tank (6) to the embedded electrode (4). The embedded electrode (4) is mounted on the electrode rotating unit (3) and driven to rotate. The electrode rotating unit (3) is mounted on the electrode feeding unit (2) and driven by it, thereby causing the embedded electrode (4) to move up and down relative to the workpiece (10) to be processed. The embedded electrode (4) includes: an insulating electrode tube (4-1), a wire (4-2), and a tool electrode (4-3); the wire (4-2) is disposed in the insulating electrode tube (4-1); the insulating electrode tube (4-1) is provided with a plurality of electrolyte spray holes (4-1-1); one end of the insulating electrode tube (4-1) is connected to the electrolyte supply system (8), and the other end is connected to the tool electrode (4-3); one end of the wire (4-2) is connected to the negative terminal of the working power supply (1), and the other end is connected to the tool electrode (4-3); the auxiliary electrode (5) is connected to the positive terminal of the working power supply (1); A plurality of electrolyte nozzles (4-1-1) are arranged circumferentially around the insulating electrode tube (4-1), and the electrolyte nozzles (4-1-1) are set as oblique holes with an inclination angle of 10° to 70°; the electrolyte supply system (8) supplies electrolyte to the insulating electrode tube (4-1) at a flow rate of 0.1 to 15.0 L / min, and the concentration of the electrolyte is 1.0 to 40.0 wt%; An embedded electrode deep hole electrolytic electrical discharge machining method is used to machine a deep hole (10-1) on the workpiece (10) to be machined, including the following steps: S1. Preparation Phase: First, according to the size requirements of the deep hole (10-1), an embedded electrode (4) of suitable size is prepared and one end of it is connected to the electrode rotating unit (3), and at the same time, it is connected to the negative terminal of the working power supply (1) through the wire (4-2); the auxiliary electrode (5) is connected to the positive terminal of the working power supply (1); The workpiece (10) and the auxiliary electrode (5) are immersed in the electrolyte (9) in the processing tank (7), and the tool electrode (4-3) is extended to the initial processing point of the deep hole (10-1) of the workpiece (10). S2, Initial Processing Stage: Turn on the power supply (1), start the electrode rotation unit (3) to drive the embedded electrode (4) to rotate, turn on the electrolyte supply system (8) to provide a low flow rate of electrolyte (9) to the insulating electrode tube (4-1) and flow to the processing end of the tool electrode (4-3) through the electrolyte spray hole (4-1-1); S3, Deep Hole Machining Stage: As the depth of the machined hole increases, the flow rate of the electrolyte (9) is increased, and the tool electrode (4-3) is fed by the electrode feed unit (2); S4. Machining End: After machining to the specified depth, the machining is stopped. The inlaid electrode (4) is retracted to the initial position by the electrode feeding unit (2). Meanwhile, the electrolyte supply and the rotation of the inlaid electrode (4) are stopped, and the deep-hole machining is completed.

2. The method for deep-hole electrolytic electrical discharge machining with an embedded electrode according to claim 1, characterized in that, It further includes a slider (11) and a guide block (12); the slider (11) is arranged on the electrode feeding unit (2) and is driven to slide by it, and the electrode rotating unit (3) is fixedly arranged on the slider (11); The guide block (12) is arranged on the slider (11), and one end of the insulating electrode tube (4-1) passes through the guide block (12) and is connected to the electrode rotating unit (3).

3. The method for deep-hole electrolytic electrical discharge machining with an embedded electrode according to claim 1, characterized in that, It further includes a liquid supply pipe (13); both ends of the liquid supply pipe (13) are respectively communicated with the insulating electrode tube (4-1) and the electrolyte supply system (8).

4. The method for deep-hole electrolytic electrical discharge machining with an embedded electrode according to claim 1, characterized in that, The insulating electrode tube (4-1) is made of polytetrafluoroethylene, epoxy resin, epoxy glass fiber, quartz glass or stainless steel with an insulating layer on its surface.

5. The method for deep-hole electrolytic electrical discharge machining with an embedded electrode according to claim 1, characterized in that, The tool electrode (4-3) is set to a "convex" shape structure, and the protruding part of the tool electrode (4-3) is embedded inside the insulating electrode tube (4-1); the tool electrode (4-3) is made of any one of stainless steel, tungsten, tungsten copper, copper or titanium alloy.

6. The method for deep-hole electrolytic electrical discharge machining with an embedded electrode according to claim 1, characterized in that, The rotation speed of the electrode rotating unit (3) driving the inlaid electrode (4) is 0-20000 rpm.

7. The method for deep-hole electrolytic electrical discharge machining with an embedded electrode according to claim 1, characterized in that, The electrolyte tank (6) is communicated with the machining tank (7), and its on-off is controlled by a valve (14).

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