A multi-energy field composite drilling and milling processing tool and processing method

Abstract

The present invention discloses a multi-energy field composite drilling and milling tool and a processing method, belonging to the field of arc processing technology. The device includes a tool rod, a guide groove, an electrode, a flushing hole, a blade, a locking nut, a flushing hole inlet tube, a linear drive device, a tool handle shell, a tool handle flushing hole inlet tube and a tool handle shell through hole. The method performs drilling or milling processing through the above device. The present invention improves the processing efficiency of difficult-to-cut materials. The arc energy density is high, and the efficiency of processing difficult-to-cut materials is much higher than that of traditional cutting processing, thereby reducing the processing cost. Efficient and high-quality processing is achieved, and the secondary clamping error caused by the roughing-first and then fine-division processing is avoided. And the coupling effect of the multi-energy field is fully utilized to realize composite processing, which is not only efficient, but also uses electroplasticity to reduce the hardness of the workpiece material, further improving the processing efficiency and effect.

Description

Technical Field

[0001] The invention relates to the technical field of arc processing, and in particular to a multi-energy field composite drilling and milling processing tool and a processing method. Background Art

[0002] Arc discharge is a phenomenon in which two electrodes are maintained conductive by gaseous charged particles, such as electrons or ions, at a certain voltage. The sample is excited to produce a spectrum. Arc discharge mainly emits atomic spectral lines and is a commonly used excitation light source for emission spectroscopy analysis. It is usually divided into DC arc discharge and AC arc discharge. Arc discharge is the strongest self-sustaining discharge in gas discharge. When the power supply provides a large amount of electric energy, the inter-electrode voltage does not need to be too high (about tens of volts), and a strong current (several amperes to tens of amperes) can continue to pass through the gas or metal vapor between the two electrodes, emitting a strong glow and generating high temperatures (thousands to tens of thousands of degrees). This is arc discharge. Arc is a common thermal plasma (see plasma applications).

[0003] At present, the existing technology still has the following deficiencies and defects: 1) Problems in the processing of brittle and hard materials. A large number of materials with high hardness and high rigidity, such as nickel-based high-temperature alloys, titanium-aluminum intermetallic compounds, high-strength steels, and metal-based composite materials, are used in the aerospace, nuclear power and other industries. These components usually have a large amount of removal, which brings great challenges to traditional cutting processing, resulting in a series of problems such as low processing efficiency, short tool life, and high processing costs. It is difficult to meet the rapidly growing demand for processing difficult-to-cut materials by using only traditional cutting processing, and it is urgent to solve this problem. 2) Advantages and problems of arc processing. Arc discharge processing is a new processing method that uses the high temperature (tens of thousands of degrees) of the plasma arc column generated between the electrode and the workpiece to quickly etch away the material. It has high energy density, and the material removal rate of difficult-to-cut materials is much higher than that of traditional cutting processing. In addition, the electrode and the workpiece do not contact during the processing, and no cutting stress is generated. It is a special processing method with great application prospects. However, due to the large single discharge energy during arc processing, the volume of the etch pit generated is also large, resulting in a relatively rough processing surface, and it is impossible to complete the fine processing with arc processing alone. 3) Problems in deep hole processing: Deep hole processing has always been a difficult problem in processing. Using long rods and large allowances for cutting can easily cause dimensional deviations due to poor tool bar rigidity, and only a feed rate far lower than conventional cutting can be used, resulting in very low processing efficiency.

[0004] In the closest comparative document to this application: an arc milling composite tool electrode (CN202210835288.9), the disclosed technical effect can only perform arc and milling composite processing, and there is no internal flushing hole at the electrode, which is not conducive to the stability of processing, and the electrode is difficult to servo compensate, affecting the continuous processing time; and the effective use of electroplasticity is not considered. In addition, the electrode cannot perform deep hole processing.

[0005] Another comparative document similar to this application: Arc Grinding Composite Tool Electrode (CN201910101580.6), the technical effect disclosed in it can only perform arc and grinding composite processing, but not arc and drilling or milling composite, and grinding and drilling or milling belong to different types of processing methods. In addition, it is impossible to perform continuous feeding compensation of the electrode, which affects the continuous processing time. The overall length of the tool electrode is short, and deep holes cannot be processed. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-energy field composite drilling and milling tool and processing method, which solves the problems existing in the processing of brittle and hard materials, the advantages and problems of arc processing, and the problems existing in deep hole processing.

[0007] To achieve the above objectives, the present invention provides a multi-energy field composite drilling and milling tool, including a tool rod and a shank, wherein the shank is sleeved on one end of the tool rod through a locking nut, and the shank includes a shank shell and a drive structure, and the drive structure is located inside the shank shell.

[0008] Preferably, a flushing hole penetrating the tool rod is provided at the end surface of the tool rod, and electrode grooves penetrating the tool rod are also provided at both end surfaces of the tool rod, and the electrode grooves are used to constrain the electrode to only move up and down in a controlled manner. Two guide grooves evenly arranged with the tool rod are provided at one end of the tool rod away from the tool handle shell, and a blade is provided at the edge of the end of the guide groove away from the tool handle shell. An electrode penetrated by the flushing hole is provided at the end of the tool rod away from the tool handle shell and is located in the electrode groove.

[0009] Preferably, the driving structure comprises a linear driving device, and flushing hole inlet tubes connected to the flushing hole are arranged on both sides of the linear driving device, and the two flushing hole inlet tubes converge at one end of the linear driving device and are connected to the flushing hole inlet tube of the tool handle.

[0010] Preferably, the linear drive device of the driving structure may adopt a structure with a push rod such as a micro hydraulic cylinder, a cylinder or a micro motor plus a lead screw pair, and the linear drive device in the present invention takes a voice coil motor as an example.

[0011] Preferably, a through hole of the tool handle shell for the tool handle flushing hole inlet pipe to pass through is provided in the center of the tool handle shell away from the tool rod.

[0012] A method for processing a multi-energy field composite drilling tool comprises the following steps:

[0013] S1. Install the workpiece on the workbench, install the blade and electrode, and complete the assembly of the composite processing tool;

[0014] S2. Install the composite machining tool on the tool holder clamping head, and the tool holder is driven by the spindle to rotate to provide cutting force;

[0015] S3, the electrode in the tool is connected to the power supply, the workpiece is connected to the power supply, and the electrode flushing hole, the tool bar flushing hole and the flushing pipe in the clamping head are connected;

[0016] S4, turn on the power, start the internal flushing, start the spindle rotation, and the composite processing tool is fed under the control of the CNC system;

[0017] S5, during the processing stage, the electrode extension must exceed the sum of the pit depth and the discharge gap, and the electrode discharges with the workpiece surface to remove most of the material;

[0018] S6. The radial extension distance of the drill bit cutting edge exceeds the sum of the pit depth and the discharge gap, and the material is cut while the discharge machining is performed to obtain a smooth surface;

[0019] S7. When drilling a blind hole, when the depth of the target hole is close to the sum of the pit depth and the discharge gap, the electrode is retracted, arc discharge is not performed, and the drill bit completes the processing of the remaining margin;

[0020] S8. In step S6 and step S7, the electrode loss length is calculated according to the material removal amount, and the driving module in the tool holder is controlled to push the electrode downward to compensate for the electrode loss and realize continuous processing.

[0021] Preferably, in step S1, after the assembly of the composite processing tool is completed, the extension or retraction amount of the electrode end is set according to processing requirements to ensure that discharge etching is performed first during processing.

[0022] Preferably, in step S6, the electric pulse frequency of the arc-electroplastically composite effect is 10 Hz-50 KHz, the current is 10-4000 A, the open circuit voltage is higher than 40 V, and the working voltage range during arc discharge machining is 15-50 V.

[0023] A processing method of a multi-energy field composite milling tool comprises the following steps:

[0024] S101, installing the workpiece on the workbench, installing the blade and the electrode, and completing the assembly of the composite processing tool;

[0025] S102, installing the composite machining tool on the tool holder clamping head, and the tool holder is driven by the spindle to rotate to provide cutting force;

[0026] S103, connecting the electrode in the tool to a power source, connecting the workpiece to a power source, and connecting the electrode flushing hole, the tool bar flushing hole and the flushing pipe in the clamping head;

[0027] S104, turning on the power supply, starting the internal flushing liquid, starting the main axis rotation, and the composite machining tool feeding under the control of the CNC system;

[0028] S105, in the rough machining stage, the electrode extension must exceed the sum of the pit depth and the discharge gap, and the electrode discharges with the workpiece surface to etch away the material;

[0029] S106, in the finishing stage, the electrode is retracted a small amount so that the milling cutter cutting edge performs cutting processing on the material;

[0030] S107. In step S105 and step S106, the electrode loss length is calculated according to the material removal amount, and the driving module in the tool holder is controlled to push the electrode to move downward along the electrode groove to compensate for the electrode loss and realize continuous processing.

[0031] Preferably, in step S105, the electric pulse frequency of the arc-electroplastically combined effect is 10 Hz-50 KHz, the current is 10-4000 A, the open circuit voltage is higher than 40 V, and the working voltage range during arc discharge machining is 15-50 V.

[0032] Preferably, in step S106, during the finishing stage, the cutting edge of the milling cutter performs cutting processing on the material, and the cutting depth is not less than the pit depth.

[0033] Therefore, the present invention adopts a multi-energy field composite drilling and milling tool and processing method of the above structure, which has the following beneficial effects:

[0034] (1) The present invention improves the processing efficiency of difficult-to-cut materials. The arc energy density is high, and the efficiency of processing difficult-to-cut materials is much higher than that of traditional cutting.

[0035] (2) The present invention reduces processing costs. Electrodes can be mass-produced and standardized, and can be replaced. The cost of a single electrode is much lower than that of a tool. The amount of tools used is greatly reduced, further reducing costs.

[0036] (3) The present invention realizes efficient and high-quality processing and avoids secondary clamping errors caused by roughing-then-fine processing.

[0037] (4) The present invention makes full use of the coupling effect of multi-energy fields to achieve composite processing, which is not only highly efficient, but also uses electroplasticity to reduce the hardness of the workpiece material, further improving the processing efficiency and effect, and achieving an effect of one plus one being greater than two.

[0038] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a multi-energy field composite drilling and milling tool and a processing method of the present invention;

[0040] Figure 2 A schematic diagram of the driving structure of a multi-energy field composite drilling and milling tool and a processing method of the present invention;

[0041] Figure 3 A schematic diagram of a tool bar of a multi-energy field composite drilling and milling tool and a processing method of the present invention;

[0042] Reference numerals

[0043] 1. Tool rod, 2. Guide groove, 3. Electrode, 4. Flushing hole, 5. Blade, 6. Locking nut, 7. Flushing hole inlet pipe, 8. Linear drive device, 9. Tool handle housing, 10. Tool handle flushing hole inlet pipe, 11. Tool handle housing through hole. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0045] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] Example

[0047] like Figure 1-3 As shown, the present invention provides a multi-energy field composite drilling and milling tool, including a tool rod 1 and a tool handle. The tool handle is sleeved on one end of the tool rod 1 through a locking nut 6. The tool handle includes a tool handle shell 9 and a driving structure. The driving structure is located inside the tool handle shell 9.

[0048] The end surface of the tool rod 1 is provided with a flushing hole 4 penetrating the tool rod 1. There may be only one flushing hole 4, or there may be no flushing hole 4 on the tool rod 1 and the hole of the electrode 3 may be directly used to achieve flushing. Electrode grooves penetrating the tool rod 1 are also provided at both end surfaces of the tool rod 1. The electrode grooves are used to constrain the electrode to move up and down in a controlled manner. Two guide grooves 2 are arranged evenly with the tool rod 1 at one end of the tool rod 1 away from the handle housing 9. A blade 5 is arranged at the edge of the end of the guide groove 2 away from the handle housing 9. The electrode 3 penetrating the flushing hole 4 is arranged at the end of the tool rod 1 away from the handle housing 9 and is located in the electrode groove.

[0049] The driving structure includes a linear driving device 8, and a flushing hole inlet pipe 7 connected to the flushing hole 4 is arranged on both sides of the linear driving device 8. The two flushing hole inlet pipes 7 are connected to the tool handle flushing hole inlet pipe 10 at one end of the linear driving device 8. The linear driving device 8 in the present invention takes a voice coil motor as an example.

[0050] A through hole 11 for a flushing hole inlet pipe 10 of the tool handle is provided at the center of the tool handle housing 9 away from the tool rod 1 .

[0051] A method for processing a multi-energy field composite drilling tool comprises the following steps:

[0052] S1. Install the workpiece on the workbench, install the blade and electrode, and complete the assembly of the composite processing tool;

[0053] S2. Install the composite machining tool on the tool holder clamping head, and the tool holder is driven by the spindle to rotate to provide cutting force;

[0054] S3, the electrode in the tool is connected to the power supply, the workpiece is connected to the power supply, and the electrode flushing hole, the tool bar flushing hole and the flushing pipe in the clamping head are connected;

[0055] S4, turn on the power, start the internal flushing, start the spindle rotation, and the composite processing tool is fed under the control of the CNC system;

[0056] S5, during the processing stage, the electrode extension must exceed the sum of the pit depth and the discharge gap, and the electrode discharges with the workpiece surface to remove most of the material;

[0057] S6. The radial extension distance of the drill bit cutting edge exceeds the sum of the pit depth and the discharge gap, and the material is cut while the discharge machining is performed to obtain a smooth surface;

[0058] S7. When drilling a blind hole, when the depth of the target hole is close to the sum of the pit depth and the discharge gap, the electrode is retracted, arc discharge is not performed, and the drill bit completes the processing of the remaining margin;

[0059] S8. In step S6 and step S7, the electrode loss length is calculated according to the material removal amount, and the driving module in the tool holder is controlled to push the electrode downward to compensate for the electrode loss and realize continuous processing.

[0060] In step S1, after the assembly of the composite machining tool is completed, the extension or retraction amount of the electrode end is set according to the machining requirements to ensure that discharge etching is performed first during machining.

[0061] In step S6, the electric pulse frequency of the arc-electroplastic composite effect is 10Hz-50KHz, the current size is 10-4000A, the open circuit voltage is higher than 40V, and the working voltage range during arc discharge machining is 15-50V.

[0062] A processing method of a multi-energy field composite milling tool comprises the following steps:

[0063] S101, installing the workpiece on the workbench, installing the blade and the electrode, and completing the assembly of the composite processing tool;

[0064] S102, installing the composite machining tool on the tool holder clamping head, and the tool holder is driven by the spindle to rotate to provide cutting force;

[0065] S103, connecting the electrode in the tool to a power source, connecting the workpiece to a power source, and connecting the electrode flushing hole, the tool bar flushing hole and the flushing pipe in the clamping head;

[0066] S104, turning on the power supply, starting the internal flushing liquid, starting the spindle rotation, and the composite machining tool feeding under the control of the CNC system;

[0067] S105, in the rough machining stage, the electrode extension must exceed the sum of the pit depth and the discharge gap, and the electrode discharges with the workpiece surface to etch away the material;

[0068] S106, in the finishing stage, the electrode is retracted a small amount so that the milling cutter cutting edge performs cutting processing on the material;

[0069] S107. In step S105 and step S106, the electrode loss length is calculated according to the material removal amount, and the driving module in the tool holder is controlled to push the electrode to move downward along the electrode groove to compensate for the electrode loss and realize continuous processing.

[0070] In step S105, the electric pulse frequency of the arc-electroplastic composite effect is 10Hz-50KHz, the current size is 10-4000A, the open circuit voltage is higher than 40V, and the working voltage range during arc discharge machining is 15-50V.

[0071] In step S106, in the finishing stage, the milling cutter cutting edge performs material cutting, and the cutting depth is not less than the pit depth.

[0072] Working principle: A gap is maintained between the workpiece and the drilling and milling head electrodes, with working fluid in between, which is kept in a deionized state between pulses.

[0073] The front end of the drilling and milling head electrode maintains a through hole, which can be a single hole or multiple holes, to achieve high-pressure internal flushing.

[0074] The drilling and milling head electrode and the drilling and milling head body can be moved in a controlled manner, and the elongation of the drilling head electrode is controlled by a control system and an actuator.

[0075] During processing, the power supply outputs direct current, which can be pulsed or pulse-free, and discharges between the drilling and milling head electrode and the workpiece to form a plasma channel. The current forms a loop through the drilling and milling head electrode, the discharge plasma channel, and the workpiece.

[0076] One end of the drilling and milling head electrode is connected to a power source, and the drilling and milling head electrode is insulated from surrounding areas.

[0077] The high temperature of the plasma channel, combined with the flushing and rotation effects, enables efficient removal of workpiece materials.

[0078] The discharge current flows through the workpiece, and under the action of Joule heat and electron wind, the surface hardness of the workpiece decreases, the cutting force is reduced, and the work hardening is alleviated. However, no current passes through the tool and it will not soften, thereby increasing the hardness difference between the tool and the workpiece, improving the cutting effect and tool life.

[0079] The cutting part of the drilling and milling head is connected to the workpiece through a wire to maintain the same potential to avoid breakdown discharge.

[0080] The surface after EDM is cut by a drilling and milling head to obtain high-quality surface and high machining accuracy.

[0081] When the drilling and milling head rotates, the outer diameter of the electrode circumference is smaller than the outer diameter of the cutting edge circumference. When used for arc milling composite processing, the axial extension of the electrode is less than the sum of the depth of the etch pit formed by the discharge and the discharge gap, and the tool mainly cuts the workpiece material after end face discharge processing; when used for arc drilling composite processing, the axial extension of the electrode is greater than 1mm, which is used to remove the material in the center to reduce the drilling processing amount. The radial protrusion of the tool is greater than the sum of the depth of the etch pit formed by the discharge and the discharge gap compared to the outer side of the electrode, and it mainly cuts the workpiece material after side discharge processing.

[0082] The cutting inserts of drilling and milling heads can be integral or replaceable.

[0083] Electric current can repair microscopic defects such as dislocations inside the workpiece material, and can obtain refined grains, which helps to improve the surface quality of processing.

[0084] The electrode has a flushing hole in the axial direction, the top of which is connected to the flushing pipe of the tool handle as the inlet of the working fluid; the bottom is the outlet, which is used for internal flushing during processing to ensure the stability of processing. The flushing hole can also be a flushing tank.

[0085] The drilling and milling head arbor is provided with a flushing hole, the top of which is connected to the shank flushing tube as the working fluid inlet; the bottom is the outlet, which is used for internal flushing during processing, or directly using the electrode internal flushing hole to achieve internal flushing to ensure processing stability; (combining the above two points, the electrode or arbor must have at least one flushing hole).

[0086] The side of the tool bar is grooved to create a gap in its cross section for the discharge of working fluid and processed products to ensure processing stability.

[0087] The upper end of the electrode is connected to the feeding mechanism, and the feeding mechanism performs servo compensation according to the electrode loss during the processing.

[0088] The electrode of the present application may be single or multiple, and may or may not have a flushing hole. When the electrode does not have a flushing hole, the milling drill bit arbor must have a flushing hole to realize the flushing function.

[0089] The tool rod material is tool steel or other high-strength alloys, the electrode is graphite, copper and its alloys or other materials with high melting point, good thermal conductivity and electrical conductivity, and the milling cutter or drill bit blade is high-speed steel, cemented carbide, diamond, cubic boron nitride or ceramic and other high-strength and high-hardness tool materials.

[0090] The working fluid is an insulating or weakly conductive water-based or oil-based working fluid.

[0091] Therefore, the present invention adopts the above-mentioned multi-energy field composite drilling and milling processing tool and processing method to improve the processing efficiency of difficult-to-cut materials. The arc energy density is high, and the efficiency of processing difficult-to-cut materials is much higher than that of traditional cutting processing, which reduces the processing cost. High-efficiency and high-quality processing is achieved, avoiding the secondary clamping error caused by the roughing and then fine separation process. And make full use of the coupling effect of the multi-energy field to achieve composite processing, which is not only efficient, but also uses electroplasticity to reduce the hardness of the workpiece material, further improving the processing efficiency and effect, and achieving the effect of one plus one being greater than two.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A multi-energy field composite drilling and milling tool, characterized in that: It comprises a tool rod and a tool handle, wherein the tool handle is sleeved on one end of the tool rod through a locking nut, and the tool handle comprises a tool handle shell and a driving structure, wherein the driving structure is located inside the tool handle shell; A through-flushing hole is provided at the end surface of the tool rod, and electrode grooves penetrating the tool rod are also provided at both end surfaces of the tool rod, the electrode grooves are used to constrain the electrode to move up and down in a controlled manner, and two guide grooves are provided at one end of the tool rod away from the handle shell and are evenly arranged with the tool rod, a blade is provided at the edge of one end of the guide groove away from the handle shell, and an electrode penetrated by the flushing hole is provided at one end of the tool rod away from the handle shell and is located in the electrode groove; Flushing hole inlet tubes connected to the flushing hole are arranged on both sides of the driving device, and two flushing hole inlet tubes are gathered at one end of the driving device and connected to the flushing hole inlet tubes. A through hole of the tool handle shell for the flushing hole inlet tube to pass through is opened at the center of one end of the tool handle shell away from the tool rod.

2. A multi-energy field composite drilling and milling tool according to claim 1, characterized in that: The driving structure comprises a linear driving device.

3. A drilling method using the multi-energy field composite drilling and milling tool according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Install the workpiece on the workbench, install the blade and electrode, and complete the assembly of the composite processing tool; S2. Install the composite machining tool on the tool holder clamping head, and the tool holder is driven by the spindle to rotate to provide cutting force; S3, the electrode in the tool is connected to the power supply, the workpiece is connected to the power supply, and the flushing hole is connected to the flushing tube in the clamping head; S4, turn on the power, start the internal flushing, start the spindle rotation, and the composite processing tool is fed under the control of the CNC system; S5, during the processing stage, the electrode extension must exceed the sum of the pit depth and the discharge gap, and the electrode discharges with the workpiece surface to remove most of the material; S6. The radial extension distance of the drill bit cutting edge exceeds the sum of the pit depth and the discharge gap, and the material is cut while the discharge machining is performed to obtain a smooth surface; S7. When drilling a blind hole, when the depth of the target hole is close to the sum of the pit depth and the discharge gap, the electrode is retracted, arc discharge is not performed, and the drill bit completes the processing of the remaining margin; S8. In step S6 and step S7, the electrode loss length is calculated according to the material removal amount, and the driving module in the tool holder is controlled to push the electrode downward to compensate for the electrode loss and realize continuous processing.

4. A drilling method according to claim 3, characterized in that: In step S1, after the assembly of the composite machining tool is completed, the extension or retraction amount of the electrode end is set according to the machining requirements to ensure that discharge etching is performed first during machining.

5. A drilling method according to claim 3, characterized in that: In step S6, the electric pulse frequency of the arc-electroplastic composite effect is 10Hz-50KHz, the current size is 10-4000A, the open circuit voltage is higher than 40V, and the working voltage range during arc discharge machining is 15-50V.

6. A milling method using the multi-energy field composite drilling and milling tool according to any one of claims 1 to 2, characterized in that: The following steps are involved: S101, installing the workpiece on the workbench, installing the blade and the electrode, and completing the assembly of the composite processing tool; S102, installing the composite machining tool on the tool holder clamping head, and the tool holder is driven by the spindle to rotate to provide cutting force; S103, connecting the electrode in the tool to a power source, connecting the workpiece to a power source, and connecting the flushing hole to the flushing tube in the clamping head; S104, turning on the power supply, starting the internal flushing liquid, starting the main axis rotation, and the composite machining tool feeding under the control of the CNC system; S105, in the rough machining stage, the electrode extension must exceed the sum of the pit depth and the discharge gap, and the electrode discharges with the workpiece surface to etch away the material; S106, in the finishing stage, the electrode is retracted a small amount so that the milling cutter cutting edge performs cutting processing on the material; S107. In step S105 and step S106, the electrode loss length is calculated according to the material removal amount, and the driving module in the tool holder is controlled to push the electrode to move downward along the electrode groove to compensate for the electrode loss and realize continuous processing.

7. A milling method according to claim 6, characterized in that: In step S105, the electric pulse frequency of the arc-electroplastic composite effect is 10Hz-50KHz, the current size is 10-4000A, the open circuit voltage is higher than 40V, and the working voltage range during arc discharge machining is 15-50V.

8. A milling method according to claim 6, characterized in that: In step S106, the finishing stage, the milling cutter cutting edge performs cutting of the material, and the cutting depth is not less than the pit depth.

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