Experimental system and method for polishing aluminum alloy sheet in vacuum cavity

Abstract

The invention discloses an experiment system and method for polishing an aluminum alloy sheet in a vacuum cavity. The experiment system comprises an experiment device and an electrical control system. The experimental device comprises a vacuum arc-extinguishing chamber, an anode static conducting rod and a cathode static conducting rod are arranged on the inner side of a top anode and the inner side of a bottom cathode of the vacuum arc-extinguishing chamber respectively, the bottom of the anode static conducting rod is movably connected with an anode movable conducting rod, and the top of the cathode static conducting rod is movably connected with a cathode movable conducting rod. The bottom of the anode moving conductive rod is connected with an anode contact through a conductive clamp, and the top of the cathode moving conductive rod is connected with a T-shaped metal sheet. The electrical control system comprises a direct current charger, a voltage divider, a high-speed camera, an oscilloscope and a computer. According to the method, the burrs, caused by milling, of the aluminum alloy can be accurately positioned and removed through multiple times of small-energy discharging, and a new way is developed for researching polishing of the metal thin-wall part.

Description

Technical Field

[0001] The present invention belongs to the field of polishing aluminum alloy thin sheets, and particularly relates to an experimental system and method for polishing aluminum alloy thin sheets in a vacuum chamber. Background Art

[0002] With the rapid development of military technology, modern warfare has increasingly high requirements for the accuracy and reliability of weapon systems. As an important air strike and self-defense system, the processing ability to precisely polish aviation thin-walled structures with weak rigidity has become a key factor in improving the overall performance. However, traditional polishing methods such as ultrasonic cleaning, chemical mechanical deburring, high-pressure water jet deburring, and manual microscopic deburring face several limitations when dealing with precision aviation components:

[0003] 1) Although ultrasonic cleaning can remove some surface contaminants and minor burrs, it may not be effective enough to achieve a highly smooth surface.

[0004] 2) Chemical mechanical deburring may damage the inherent properties of the material due to the uncontrollability of chemical reactions, especially on precision components, which may lead to unpredictable material damage.

[0005] 3) Although high-pressure water jet deburring can remove burrs on hard materials, it may cause deformation or damage to components of thin-walled structures with weak rigidity.

[0006] 4) Manual microscopic deburring is extremely precise, but has extremely low efficiency, high costs, and extremely high requirements for the skills of operators, and is not suitable for large-scale production.

[0007] On the other hand, currently, the method of using plasma for polishing is mainly applied to the surface polishing of copper contacts. The contact objects for polishing are mostly cylindrical, highlighting the limitations of the current technology in terms of application scope. Especially when dealing with metal thin sheets of different materials and shapes, such as aluminum alloy thin sheets, the existing plasma polishing technology faces great challenges. The high reactivity and easy oxidation properties of aluminum alloy also bring additional complexity in a vacuum plasma environment. Aluminum alloy has higher surface concentrated stress during aging compared to copper contacts, and at this time, the large-current aging method of current arc ignition commonly used for copper contacts is no longer applicable. At the same time, the placement of aluminum alloy thin sheets in a vacuum chamber is also a major problem that needs to be solved.

[0008] In summary, existing polishing methods such as ultrasonic cleaning, chemical mechanical deburring, high-pressure water jet deburring, and manual microscopic deburring all have their respective limitations when dealing with precision aviation components, such as low efficiency, high costs, and possible damage to material properties. Although the current plasma polishing technology shows certain potential, when applied to metal thin sheets of different materials and shapes, such as highly reactive and easily oxidized aluminum alloy, it still faces technical challenges and application scope limitations. Summary of the Invention

[0009] The object of the present invention is to provide an experimental system and method for polishing aluminum alloy thin sheets in a vacuum chamber to solve the problems existing in the prior art.

[0010] To achieve the above object, the present invention adopts the following technical solutions:

[0011] An experimental system for polishing aluminum alloy thin sheets in a vacuum chamber, comprising an experimental device and an electrical control system;

[0012] The experimental device includes a vacuum interrupter. An anode static conducting rod and a cathode static conducting rod are respectively arranged inside the top positive electrode and the bottom negative electrode of the vacuum interrupter. The bottom of the anode static conducting rod is movably connected to an anode moving conducting rod, the top of the cathode static conducting rod is movably connected to a cathode moving conducting rod, the bottom of the anode moving conducting rod is connected to an anode contact through a conductive clamp, and the top of the cathode moving conducting rod is connected to a T-shaped metal sheet;

[0013] The electrical control system includes a DC charger, a voltage divider, a high-speed camera, an oscilloscope and a computer;

[0014] The DC charger and the voltage divider are both connected to the top positive electrode and the bottom negative electrode of the vacuum interrupter through wires, and the DC charger is connected to the computer through a data line. An observation window is arranged on the side of the vacuum interrupter, the high-speed camera is arranged opposite to the observation window, and the high-speed camera is connected to the computer through a data line. The oscilloscope is connected to the voltage divider through one probe and to the high-speed camera through another probe.

[0015] Further, the anode static conducting rod is threadedly connected to the anode moving conducting rod, and the cathode static conducting rod is threadedly connected to the cathode moving conducting rod.

[0016] Further, the free end of the anode contact is flat or hemispherical.

[0017] Further, an installation groove is arranged at the top of the cathode moving conducting rod, the bottom of the T-shaped metal sheet is placed in the installation groove, and the T-shaped metal sheet is fixed by a clamping screw on the side of the installation groove.

[0018] Further, the top shape of the T-shaped metal sheet is square or circular;

[0019] The top surface of the T-shaped metal sheet is a milled flat surface or a surface with protrusions.

[0020] Further, the discharge form between the anode contact and the T-shaped metal sheet is pulsed discharge, the discharge interval is 0.7 - 1 s, and the discharge voltage is 5 kV - 40 kV;

[0021] The voltage divider adopts a resistive-capacitive 50 kV voltage divider.

[0022] Further, the conductive fixture includes a fixing plate, and an integrally formed anode limiting member is arranged on the side surface of the fixing plate. The anode limiting member includes two vertical plates and a horizontal plate. The fixing plate is fixedly connected to the side surface of the vertical plates. Grooves are arranged on one side of the two vertical plates close to the horizontal plate, and the two grooves are arranged oppositely. An activity gap is formed between the two grooves, and an activity block is arranged in the activity gap. A first mounting hole for cooperating with the anode moving conductive rod is arranged on the horizontal plate, and a second mounting hole for cooperating with the anode contact is arranged on the activity block.

[0023] Further, a first gap extending to the first mounting hole is arranged at the free end of the horizontal plate, and a first fastening hole capable of adjusting the first gap is arranged at the free end of the horizontal plate;

[0024] A second gap extending to the second mounting hole is arranged at the free end of the activity block, and a second fastening hole capable of adjusting the second gap is arranged at the free end of the activity block.

[0025] Further, waist-shaped holes are arranged at positions of the vertical plates corresponding to the grooves, threaded holes for cooperating with the waist-shaped holes are arranged on the activity block, and the position of the activity block is adjusted by bolts cooperating with the waist-shaped holes and the threaded holes.

[0026] An experimental method for polishing an aluminum alloy thin sheet in a vacuum chamber includes:

[0027] Adjust the distance and relative position between the anode contact and the T-shaped metal thin sheet. When the preset distance and position are reached, evacuate the vacuum interrupter. When the predetermined vacuum degree is reached, use a computer to control the DC charger to discharge according to the set parameters, accurately locate the weak point on the T-shaped metal thin sheet. The vacuum gap between the anode contact and the T-shaped metal thin sheet is broken down under the charging high voltage of the DC charger, and the voltage of the vacuum gap rapidly drops to 0 to generate a falling edge signal. After the oscilloscope receives the falling edge signal, it is transmitted to the high-speed camera through a probe, triggering the high-speed camera to start taking pictures after receiving the falling edge signal. The pictures are read on the computer. After the discharge of the T-shaped metal thin sheet is completed, the surface of the T-shaped metal thin sheet is characterized by a scanning electron microscope to check the polishing effect.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] The present invention provides an experimental system for polishing aluminum alloy thin sheets in a vacuum chamber. An anode static conducting rod, an anode moving conducting rod, a cathode moving conducting rod, and a cathode static conducting rod are arranged in a vacuum interrupter. The anode static conducting rod is movably connected to the anode moving conducting rod, and the cathode moving conducting rod is movably connected to the cathode static conducting rod, so that the distance between the anode contact and the T-shaped metal sheet can be adjusted. The DC charger contains a capacitor inside. After breakdown discharge, re-discharge requires a set protection time and capacitor charging time. The discharge form between the anode contact and the T-shaped metal sheet is pulsed discharge. Therefore, each discharge will find the weak point on the surface of the T-shaped metal sheet for breakdown polishing. By means of multiple small-energy discharges, the burrs caused by milling of the aluminum alloy can be accurately located and removed. In addition, by setting up a high-speed camera, an oscilloscope, a computer, etc., electrical information such as breakdown voltage can be captured and the discharge process can be photographed, and the influence rules of discharge parameters such as atmosphere conditions, electrode materials and shapes, distance between the electrode and the sample, polishing time, etc. on the polishing characteristics of different metal surfaces can be studied, opening up a new way for the study of polishing of metal thin-walled parts.

[0030] Further, an installation groove is provided at the top of the cathode moving conducting rod, and the bottom of the T-shaped metal sheet is placed in the installation groove. The T-shaped metal sheet is fixed by a clamping screw on the side of the installation groove, enabling the aluminum alloy thin sheet to be placed simply and easily.

[0031] Further, by designing the structure of the conductive fixture, it can be ensured that the anode contact is directly opposite to the T-shaped metal sheet, and the fastening of the anode contact and the anode moving conducting rod can be ensured.

[0032] The present invention proposes an experimental method for polishing aluminum alloy thin sheets in a vacuum chamber. On the one hand, by improving the original discharge method between contacts, a simple and easy method for placing aluminum alloy thin sheets is realized; on the other hand, a small-capacitance high-voltage discharge method is designed. By using the local distortion of the electric field caused by different defects on the metal surface, the burrs caused by milling of the aluminum alloy can be accurately located and removed through multiple small-energy discharges. At the same time, the measurement circuit can capture electrical information such as breakdown voltage and photograph the discharge process, and the influence rules of discharge parameters such as atmosphere conditions, electrode materials and shapes, distance between the electrode and the sample, polishing time, etc. on the polishing characteristics of different metal surfaces can be studied, opening up a new way and method for the study of polishing of metal thin-walled parts. Description of the Drawings

[0033] The accompanying drawings in the specification are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0034] Figure 1 It is a schematic structural diagram of the experimental device of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the movable block of the conductive fixture;

[0036] Figure 3 Schematic diagram of the fixed plate structure of the conductive fixture;

[0037] Figure 4 Schematic diagram of the limiting member structure of the conductive fixture;

[0038] Figure 5 Schematic diagram of the conductive fixture structure;

[0039] Figure 6 Schematic diagram of the overall structure of the experimental system of the present invention;

[0040] Figure 7 Low - voltage discharge diagram, where (a) is the low - voltage discharge Figure 1 , (b) is the low - voltage discharge Figure 2 ;

[0041] Figure 8 Electron microscope image of the untreated thin sheet, where (a) is the electron microscope image of the untreated thin sheet Figure 1 , (b) is the electron microscope image of the untreated thin sheet Figure 2 ;

[0042] Figure 9 Electron microscope image of the thin sheet after discharge treatment, where (a) is the electron microscope image of the thin sheet after discharge treatment Figure 1 , (b) is the electron microscope image of the thin sheet after discharge treatment Figure 2 .

[0043] Among them, 1. Anode static conductive rod; 2. Anode moving conductive rod; 3. Conductive fixture; 4. Anode contact; 5. T - shaped metal sheet; 6. Clamping screw; 7. Cathode moving conductive rod; 8. Cathode static conductive rod; 9. Vacuum arc - quenching chamber; 10. DC charger; 11. Voltage divider; 12. High - speed camera; 13. Oscilloscope; 14. Computer; 15. Fixed plate, 16. Anode limiting member; 17. Movable block; 18. First mounting hole; 19. Second mounting hole. Detailed implementation manners

[0044] In order to enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0046] Embodiment 1

[0047] The present invention provides an experimental system for polishing aluminum alloy thin sheets in a vacuum chamber. The experimental system involves an experimental device and an electrical control system.

[0048] See Figure 1 , the experimental device mainly includes an anode static conductive rod 1, an anode moving conductive rod 2, a conductive fixture 3, an anode contact 4, a T-shaped metal sheet 5 (i.e., the aluminum alloy thin sheet to be tested), a clamping screw 6, a cathode moving conductive rod 7, a cathode static conductive rod 8, and a vacuum interrupter 9. Among them, the anode static conductive rod 1 and the cathode static conductive rod 8 are fixed to the vacuum interrupter 9, and the anode moving conductive rod 2 is fixedly connected to the conductive fixture 3.

[0049] The anode static conductive rod 1 and the anode moving conductive rod 2, and the cathode moving conductive rod 7 and the cathode static conductive rod 8 are all connected by screw threads, and the distance between the anode contact 4 and the T-shaped metal sheet 5 can be adjusted.

[0050] See Figure 2 , Figure 3 , Figure 4 and Figure 5, the conductive fixture 3 includes a fixing plate 15, and an integrally formed anode limiting member 16 is provided on the side surface of the fixing plate 15. The anode limiting member 16 includes two vertical plates and a horizontal plate. The fixing plate 15 is fixedly connected to the side surface of the vertical plate. Specifically, threaded holes can be provided on the side surface of the vertical plate, and threaded holes are provided at corresponding positions on the fixing plate 15, and they are fixed by the cooperation of the threaded holes on the vertical plate and the fixing plate 15. Grooves are provided on one side of both vertical plates close to the horizontal plate, and the two grooves are arranged oppositely, and an activity gap is formed between the two grooves. An activity block 17 is arranged in the activity gap. A first mounting hole 18 for cooperating with the anode moving conductive rod 2 is provided on the horizontal plate. A second mounting hole 19 for cooperating with the anode contact is provided on the activity block 17. A first gap extending to the first mounting hole 18 is provided at the free end of the horizontal plate. A first fastening hole capable of adjusting the first gap is provided at the free end of the horizontal plate. Specifically, internal threads can be provided in the first fastening hole and fastened by bolts; a second gap extending to the second mounting hole 19 is provided at the free end of the activity block 17. A second fastening hole capable of adjusting the second gap is provided at the free end of the activity block 17. Specifically, internal threads can be provided in the second fastening hole and fastened by bolts. Waist-shaped holes are provided at the positions of the vertical plates corresponding to the grooves, and threaded holes for cooperating with the waist-shaped holes are provided on the activity block 17. The position of the activity block 17 is adjusted by bolts cooperating with the waist-shaped holes and the threaded holes. The activity block 17 can move two-dimensionally to ensure that the anode contact 4 is directly opposite to the T-shaped metal sheet 5. The anode contact 4 specifically adopts but is not limited to shapes such as a plane and a hemisphere.

[0051] The T-shaped metal sheet 5 is fixed on the cathode moving conductive rod 7 by a clamping screw 6. The shape of the sheet is not limited to regular shapes such as a square and a circle; the surface is not limited to a plane after milling and a surface with protrusions; the position can be parallel to or at a certain angle to the anode contact 4.

[0052] The T-shaped metal sheet 5, the clamping screw 6 and the cathode moving conductive rod 7 can be replaced with traditional contacts, conductive rods and conductive fixtures for traditional polishing experiments.

[0053] See Figure 6 , the electrical control part mainly includes a DC charger 10, a voltage divider 11, a high-speed camera 12, an oscilloscope 13 and a computer 14. The computer 14 can specifically adopt a laptop computer during use. The DC charger 10 is connected to the positive and negative electrodes of the vacuum interrupter 9 through wires, and is simultaneously connected to the computer 14 through a data cable. The voltage divider 11 is connected to the positive and negative electrodes of the vacuum interrupter 9 through wires. The high-speed camera 12 is directly opposite to the observation window of the vacuum interrupter 9. The observation window can adopt quartz glass and is simultaneously connected to the computer 14 through a data cable. The oscilloscope 13 is connected to the voltage divider 11 through a probe, and is simultaneously connected to the high-speed camera 12 through another probe.

[0054] The charging method of the DC charger 6 is that the upper computer software of the computer 10 sets the charging voltage, current and time. The maximum charging voltage is 50 kV and the maximum charging current is 80 mA. The DC charger 6 contains capacitors inside. After breakdown discharge, the capacitor needs to be charged again after a set protection time and capacitor charging time. The discharge form of the anode contact 4 and the T-shaped metal sheet 5 is pulsed discharge. Therefore, each discharge will find the weak point on the surface of the T-shaped metal sheet 5 for breakdown and polishing. The voltage divider 7 is a pulsed discharge according to the discharge characteristics. The discharge interval is 0.7 - 1 s, and the discharge voltage is 5 kV - 40 kV. It is a capacitive voltage divider of 50 kV selected.

[0055] The triggering moment of the oscilloscope 13 is that the vacuum gap between the anode contact 4 and the T-shaped metal sheet 5 is broken down under the charging high voltage of the DC charger 10, and the voltage of the vacuum gap drops rapidly to 0, generating a falling edge. After receiving this falling edge signal, the oscilloscope 13 is transmitted to the high-speed camera 12 through the probe, and the high-speed camera starts taking pictures after receiving the falling edge trigger signal.

[0056] During use, first adjust the distance and relative position between the anode contact 4 and the T-shaped metal sheet 5, evacuate the vacuum interrupter 9. When the predetermined vacuum degree is reached, use the upper computer of the computer 14 to control the DC charger 10 to discharge according to the set parameters, accurately locate the weak point on the T-shaped metal sheet 5. At the same time, the voltage divider 11 measures the breakdown waveform of the vacuum gap and records it on the oscilloscope 13. The oscilloscope 13 triggers the high-speed camera 12 to start taking pictures. The pictures are read by a specific upper computer on the computer 14. After the discharge is completed, the surface of the T-shaped metal sheet 2 can be characterized by a scanning electron microscope to check the polishing effect, that is, flat areas appear on the rough plane.

[0057] Embodiment 2

[0058] The present invention proposes an experimental method for polishing an aluminum alloy sheet in a vacuum chamber. Adjust the distance and relative position between the anode contact 4 and the T-shaped metal sheet 5. When the preset distance and position are reached (specifically, the relative position remains parallel and the preset distance is 1.3 mm), evacuate the vacuum interrupter 9. When the predetermined vacuum degree is reached (specifically, when the vacuum degree drops to 5*10 -3Below Pa (it is considered to reach the low-pressure state), the computer 14 is used to control the DC charger 10 to discharge according to the set parameters (specifically, set the initial current to 80 mA, the voltage to 25 kV, the discharge time to 30 s each time, and the preset discharge times to 20 times), accurately locate the weak points on the T-shaped metal sheet 5, and the vacuum gap between the anode contact 4 and the T-shaped metal sheet 5 is broken down under the charging high voltage of the DC charger 10. The voltage of the vacuum gap drops rapidly to 0 to generate a falling-edge signal. After the oscilloscope 13 receives the falling-edge signal, it is transmitted to the high-speed camera 12 through the probe, triggering the high-speed camera 12 to start taking pictures after receiving the falling-edge signal. The pictures are read on the computer 14. After the discharge is completed, the surface of the T-shaped metal sheet 2 is characterized by a scanning electron microscope to check the polishing effect.

[0059] Figure 7 It is the discharge diagram of the T-shaped thin sheet taken by the high-speed camera under low-pressure conditions. The parameters of the high-speed camera are set as the resolution of 800*600, the sampling rate of 5000 fps, and the exposure time of 200 μs. Due to the too thin thickness, the plane is curled, and at the same time, the tip discharge effect occurs. For the square thin sheet, the discharge always occurs at the four corners. Figure 8 and Figure 9 They are the SEM images of the surface of the thin sheet before and after discharge (different shooting directions of the same thin sheet). The magnification of the scanning electron microscope is set to 100 times, and the acceleration voltage is 15 kV. When the brightness and contrast are adjusted to achieve the expected effect, SEM shooting is carried out. Before the discharge, the surface of the thin sheet shows obvious roughness, and the height differences at each point are relatively large, resulting in the irregularity of the surface. However, after the discharge treatment, especially at the corner positions of the thin sheet, obvious large flat areas appear. This change reflects the influence of the discharge process on the surface microstructure, successfully reduces the height difference, improves the overall smoothness of the surface, and proves the actual effect of this method in optimizing the surface properties of materials.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent replacements to the specific implementation manners of the invention, but these changes, modifications or equivalent replacements are all within the protection scope of the pending claims of the invention.

Claims

1. An experimental system for polishing aluminum alloy thin slices in a vacuum chamber, characterized in that: Including experimental equipment and electrical control system; The experimental device comprises a vacuum interrupter (9), wherein an anode static conductive rod (1) and a cathode static conductive rod (8) are respectively arranged on the inner side of the top positive pole and the inner side of the bottom negative pole of the vacuum interrupter (9), the bottom of the anode static conductive rod (1) is movably connected to an anode dynamic conductive rod (2), the top of the cathode static conductive rod (8) is movably connected to a cathode dynamic conductive rod (7), the bottom of the anode dynamic conductive rod (2) is connected to an anode contact (4) via a conductive clamp (3), and the top of the cathode dynamic conductive rod (7) is connected to a T-shaped metal sheet (5); The electrical control system comprises a DC charger (10), a voltage divider (11), a high-speed camera (12), an oscilloscope (13) and a computer (14); The DC charger (10) and the voltage divider (11) are both connected to the top positive electrode and the bottom negative electrode of the vacuum interrupter (9) through wires, and the DC charger (10) is connected to a computer (14) through a data line. An observation window is provided on the side of the vacuum interrupter (9), and the high-speed camera (12) is arranged opposite to the observation window, and the high-speed camera (12) is connected to the computer (14) through a data line. The oscilloscope (13) is connected to the voltage divider (11) through a probe, and is connected to the high-speed camera (12) through another probe.

2. The experimental system for polishing aluminum alloy slices in a vacuum chamber according to claim 1, characterized in that: The anode static conductive rod (1) is threadedly connected to the anode dynamic conductive rod (2), and the cathode static conductive rod (8) is threadedly connected to the cathode dynamic conductive rod (7).

3. The experimental system for polishing aluminum alloy thin slices in a vacuum chamber according to claim 1, characterized in that: The free end of the anode contact (4) is planar or hemispherical.

4. The experimental system for polishing aluminum alloy thin slices in a vacuum chamber according to claim 1, characterized in that: The top of the cathode moving conductive rod (7) is provided with a mounting groove, the bottom of the T-shaped metal sheet (5) is placed in the mounting groove, and the T-shaped metal sheet (5) is fixed by a clamping screw (6) on the side of the mounting groove.

5. The experimental system for polishing aluminum alloy thin slices in a vacuum chamber according to claim 4, characterized in that: The top shape of the T-shaped metal sheet (5) is square or circular; The top surface of the T-shaped metal sheet (5) is a milled flat surface or a surface with protrusions.

6. The experimental system for polishing aluminum alloy thin slices in a vacuum chamber according to claim 1, characterized in that: The discharge form between the anode contact (4) and the T-shaped metal sheet (5) is pulse discharge, the discharge interval is 0.7-1s, and the discharge voltage is 5kV-40kV; The voltage divider (7) is a 50 kV resistor-capacitor voltage divider.

7. The experimental system for polishing aluminum alloy thin slices in a vacuum chamber according to claim 1, characterized in that: The conductive clamp (3) comprises a fixed plate (15), and an integrally formed positive limit position member (16) is arranged on the side of the fixed plate (15). The positive limit position member (16) comprises two vertical plates and a horizontal plate. The fixed plate (15) is fixedly connected to the side of the vertical plate. A groove is arranged on one side of the two vertical plates close to the horizontal plate. The two grooves are arranged opposite to each other, and a movable gap is formed between the two grooves. A movable block (17) is arranged in the movable gap. A first mounting hole (18) cooperating with the anode movable conductive rod (2) is arranged on the horizontal plate, and a second mounting hole (19) cooperating with the anode contact is arranged on the movable block (17).

8. The experimental system for polishing aluminum alloy slices in a vacuum chamber according to claim 7, characterized in that: The free end of the horizontal plate is provided with a first slit extending to a first mounting hole (18), and the free end of the horizontal plate is provided with a first fastening hole capable of adjusting the first slit; The free end of the movable block (17) is provided with a second slit extending to the second mounting hole (19), and the free end of the movable block (17) is provided with a second fastening hole capable of adjusting the second slit.

9. The experimental system for polishing aluminum alloy thin slices in a vacuum chamber according to claim 7, characterized in that: The vertical plate is provided with a waist-shaped hole at a position corresponding to the groove, and the movable block (17) is provided with a threaded hole matching the waist-shaped hole. The movable block (17) is adjusted in position by a bolt matching the waist-shaped hole and the threaded hole.

10. An experimental method for polishing aluminum alloy thin slices in a vacuum chamber, based on the experimental system according to any one of claims 1 to 9, characterized in that: include: The spacing and relative position between the anode contact (4) and the T-shaped metal sheet (5) are adjusted. When the preset spacing and position are reached, the vacuum interrupter (9) is evacuated. When the preset vacuum degree is reached, the DC charger (10) is controlled by a computer (14) to discharge according to the set parameters, and the weak point on the T-shaped metal sheet (5) is accurately located. The vacuum gap between the anode contact (4) and the T-shaped metal sheet (5) is broken down under the charging high voltage of the DC charger (10), and the vacuum gap voltage drops rapidly to 0 to generate a falling edge signal. The oscilloscope (13) receives the falling edge signal and transmits it to the high-speed camera (12) through the probe, triggering the high-speed camera (12) to start taking pictures after receiving the falling edge signal. The pictures are read on the computer (14). After the discharge is completed, the surface of the T-shaped metal sheet (2) is characterized by a scanning electron microscope to check the polishing effect.

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