Soft metal metallographic sample grinding and polishing platform based on anode dissolution principle

Abstract

The invention provides a soft metal metallographic sample grinding and polishing platform based on an anode dissolution principle, which is characterized in that a working table (11) is provided with a water collecting tank (12); the conductive grinding and polishing disc (31) is driven by a rotary table motor (34) to rotate in the water collecting tank (12); the first longitudinal adjusting part can drive the metallographic sample clamp (27) to move up and down, so that the sample can form contact pressure with the conductive grinding and polishing disc (31); the second longitudinal adjusting part can drive the cathode (41) to move up and down so as to adjust the distance between the cathode (41) and the conductive grinding and polishing disc (31); the positive electrode of the high-frequency direct-current pulse power supply (7) is connected with a rotary table motor (34) and a conductive grinding and polishing disc (31) through an anode electric brush (8); the cathode is connected with the cathode (41); and electrolyte is sprayed to a gap between the cathode (41) and the conductive grinding and polishing disc (31) from the electrolyte supply assembly (9) through an electrolyte outlet of the cathode (41). The quality and efficiency of preparing the soft metal metallographic sample can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical parts processing, in particular to a soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle. Background Art

[0002] Soft metals such as aluminum, magnesium, and copper are widely used in aerospace, transportation, power electronics, and other fields due to their excellent performance, and have played an indispensable role in promoting industrial innovation and enhancing product competitiveness. Metallographic analysis occupies an important position in the field of materials research. High-quality metallographic samples are the basis of material characterization technology and the prerequisite for identifying internal microstructure information of materials (including crystal defects, grain boundary characteristics, and atomic arrangement). They are crucial for studying the phase change behavior of materials, performance optimization, and the development of new quality materials. For example, X-ray diffraction and transmission electron microscopy tests usually require the surface of metallographic samples to reach submicron level flatness, while Raman spectroscopy and infrared spectroscopy tests require metallographic samples to have nanometer-level surface finish.

[0003] The traditional method of preparing metallographic samples is to use grinding and polishing, using conservative material removal parameters and frequently changing grinding discs (or sandpaper) to ensure the final processing quality of metallographic samples. This traditional method of preparing metallographic samples by grinding and polishing not only has low processing efficiency, but also in the process of preparing metallographic samples of soft metals such as aluminum, magnesium, and copper, the surface of the grinding disc is prone to adhesion. The adhered metal will passivate the abrasive particles and block the pores of the grinding disc, which can easily lead to serious wear of the grinding disc and scratches or redeposition on the processed surface, which ultimately affects the surface flatness, surface finish, integrity of the crystal structure and processing consistency of the sample, making subsequent metal body characterization technology difficult to carry out.

[0004] To this end, some studies have attempted to add a high-pressure jet system to an ordinary grinding and polishing test machine to clean the grinding wheel with a high-pressure water jet. However, this method is difficult to remove the cold-welded metal on the surface of the grinding wheel, and the high-pressure impact may cause the processing system to vibrate, thus affecting the final processing quality.

[0005] Therefore, it is urgent to develop a grinding and polishing platform for the preparation of soft metal metallographic samples to improve the preparation quality and efficiency of soft metal metallographic samples. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a soft metal metallographic sample grinding and polishing platform based on the principle of anodic dissolution, which can solve the problem of grinding and polishing disc adhesion during the preparation of soft metal metallographic samples such as aluminum, magnesium, and copper, thereby improving the preparation quality and efficiency of soft metal metallographic samples.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] The present invention provides a soft metal metallographic sample grinding and polishing platform based on the principle of anodic dissolution, wherein:

[0009] The soft metal metallographic sample grinding and polishing platform comprises: a workbench component, a sample clamping end component, a grinding and polishing end component, an electrochemical cleaning end component, a motor and cylinder control system, a high-frequency DC pulse power supply, and an electrolyte supply component;

[0010] The workbench assembly is the supporting structure of the entire grinding and polishing platform, which includes a workbench and a water collection tank, and has a shaft hole for installing the grinding and polishing end assembly;

[0011] The grinding and polishing end assembly includes a conductive grinding and polishing disc and a turntable motor, wherein the conductive grinding and polishing disc is driven by the turntable motor to rotate in the water collection tank;

[0012] The sample clamping end assembly includes a longitudinal adjustment component and a metallographic sample clamp; the longitudinal adjustment component can drive the metallographic sample clamp to move up and down, so that the soft metal metallographic sample clamped by the metallographic sample clamp can contact with the conductive polishing disc and form a certain pressure;

[0013] The electrochemical cleaning end assembly includes a longitudinal adjustment component and a cathode; the longitudinal adjustment component can drive the cathode to move up and down, so that the distance between the cathode and the conductive polishing disc can be adjusted;

[0014] The positive electrode of the high-frequency DC pulse power supply is connected to the turntable spindle and the conductive polishing disc via the anode brush; the negative electrode is connected to the cathode;

[0015] The electrolyte is sprayed from the electrolyte supply assembly to the gap between the cathode and the conductive polishing disc;

[0016] The motor and cylinder control system is connected to the control end of the sample clamping end assembly, the grinding and polishing end assembly, and the electrochemical cleaning end assembly in a wireless or wired manner.

[0017] More preferred:

[0018] The sample clamping end assembly also includes: a grinding and polishing motor;

[0019] The metallographic sample fixture is connected to the output end of the grinding and polishing motor and can perform rotational motion under the drive of the grinding and polishing motor.

[0020] More preferred:

[0021] The longitudinal adjustment components include: a guide rail, a slider, a feed motor, and a connecting rod;

[0022] The guide rail is fixed on the workbench; the slider cooperates with the guide rail, and one end of the connecting rod is fixed on the slider; the feed motor is fixed on the guide rail, and its output end is connected to the slider and can drive the slider to move up and down along the guide rail.

[0023] More preferred:

[0024] The guide rail is a dovetail structure, and a dovetail groove matching the dovetail structure is arranged inside the slider.

[0025] More preferred:

[0026] The sample holding end assembly further comprises: a pressure-adjustable cylinder;

[0027] The output end of the pressure-adjustable cylinder is connected to the metallographic sample fixture for adjusting the contact pressure between the metallographic sample fixture and the conductive polishing disc; the motor and cylinder control system is connected to the control end of the pressure-adjustable cylinder in a wireless or wired manner.

[0028] More preferred:

[0029] The conductive polishing disc is formed by mixing and pressing abrasive grains, conductive fillers and non-metallic binders.

[0030] More preferred:

[0031] The grinding and polishing end assembly also includes: a turntable and a turntable spindle;

[0032] The conductive polishing disc is installed on the upper surface of the turntable; the turntable main shaft is vertically installed in the rotating shaft hole of the worktable of the worktable assembly through a bearing assembly, its upper end is connected to the turntable, and the lower end is connected to the output shaft of the turntable motor, and can be driven to rotate by the turntable motor.

[0033] More preferably: the turntable is a marble turntable or a cast iron turntable.

[0034] More preferred:

[0035] The workbench and the water collecting tank are provided with water collecting holes for collecting electrolyte and draining the electrolyte to the electrolyte supply assembly;

[0036] The electrolyte supply assembly includes a water storage tank, an electrolyte supply pump and a water pipe;

[0037] The electrolyte is supplied by the electrolyte supply pump, through the water pipe and cathode, sprayed to the gap between the cathode and the conductive polishing disc, and drained into the water storage tank through the water collection holes on the workbench and the water collection tank.

[0038] More preferred:

[0039] The cathode is composed of a cathode body and a cathode pressing plate. The upper surface of the cathode body is provided with a circular hole as an electrolyte inlet and a cathode terminal, and the lower surface is provided with a micro groove as an electrolyte injection outlet.

[0040] It can be seen from the above technical solutions of the present invention that the present invention has the following technical effects:

[0041] The present invention designs a non-metallic binder conductive polishing disc based on the conductive percolation mechanism of polymer-based conductive composite materials and the principle of electrochemical dissolution of metal anodes, and connects the polishing disc to the positive electrode of a high-frequency DC pulse power supply as an inert anode. Through the anodic electrochemical dissolution of the adherents on the surface of the polishing disc, the instant, efficient and non-destructive cleaning of the polishing disc is achieved, so that the cutting ability can be stably maintained for a long time, thereby reducing the replacement frequency of the polishing disc and improving the processing quality of soft metal metallographic samples.

[0042] The present invention can improve the efficiency of soft metal sample preparation: the platform execution end includes a metallographic sample grinding and polishing part and a grinding and polishing disc electrochemical cleaning part. During the processing, the adhered metal generated on the surface of the grinding and polishing disc of the metallographic sample will be timely and locally removed in the cleaning area, so that the cutting performance of the grinding and polishing disc can be maintained stably for a long time, thereby realizing the efficient preparation of soft metal metallographic samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of a soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle in the present invention;

[0044] Figure 2 It is a structural schematic diagram of the workbench assembly in the present invention;

[0045] Figure 3 It is a schematic structural diagram of the sample clamping end assembly in the present invention;

[0046] Figure 4 It is a schematic diagram of the structure of the grinding and polishing end assembly in the present invention;

[0047] Figure 5 It is a structural schematic diagram of the electrochemical cleaning end assembly in the present invention;

[0048] Figure 6 It is a structural schematic diagram of the electrolyte supply assembly in the present invention;

[0049] Figure 7 (a) The electrochemical dissolution principle of metal adhered to the surface of the conductive polishing disc;

[0050] Figure 7 (b) Schematic diagram of the dissolution process of metal adhered to the surface of the conductive polishing disc.

[0051] Description of reference numerals:

[0052] Workbench assembly 1, sample clamping end assembly 2, grinding and polishing end assembly 3, electrochemical cleaning end assembly 4, motor and cylinder control system 5, wire 6, high-frequency DC pulse power supply 7, anode brush 8, electrolyte supply assembly 9;

[0053] Workbench 11, water collection tank 12;

[0054] Sample end guide rail 21, sample end slide block 22, sample end feed motor 23, sample end connecting rod 24, grinding and polishing motor 25, pressure adjustable cylinder 26, metallographic sample fixture 27;

[0055] Conductive polishing disc 31, turntable 32, turntable spindle 33, turntable motor 34;

[0056] Cathode 41, cleaning end connecting rod 42, cleaning end feeding motor 43, cleaning end slider 44, cleaning end guide rail 45;

[0057] Water storage tank 91 , electrolyte supply pump 92 , and water pipe 93 . DETAILED DESCRIPTION

[0058] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0059] The embodiment of the present invention provides a soft metal metallographic sample grinding and polishing platform based on the principle of anodic dissolution, and the execution end of the platform includes a metallographic sample grinding and polishing part and a grinding and polishing disc electrochemical cleaning part. During the processing, the adhered metal generated on the surface of the grinding and polishing disc of the metallographic sample will be timely and locally removed in the cleaning area, so that the cutting performance of the grinding and polishing disc can be maintained stably for a long time, thereby realizing the efficient preparation of soft metal metallographic samples.

[0060] The structure of the soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle of the present invention is as follows: Figure 1 As shown, the grinding and polishing platform includes:

[0061] Workbench assembly 1, sample clamping end assembly 2, grinding and polishing end assembly 3, electrochemical cleaning end assembly 4, motor and cylinder control system 5, wire 6, high-frequency DC pulse power supply 7, anode brush 8, electrolyte supply assembly 9.

[0062] The workbench assembly 1 is the supporting structure of the entire polishing platform, which includes a workbench 11 and a water collecting tank 12, and the water collecting tank 12 is located above the workbench 11; the workbench 11 and the water collecting tank 12 are provided with coaxial water collecting holes for collecting electrolyte and draining the electrolyte to the water storage tank 91 of the electrolyte supply assembly 9; the workbench 11 and the water collecting tank 12 are both provided with coaxial shaft holes for installing the polishing end assembly 3;

[0063] The polishing end assembly 3 includes a conductive polishing disc 31 and a turntable motor 34. The conductive polishing disc 31 is driven by the turntable motor 34 to rotate in the water collection tank 12.

[0064] The sample clamping end assembly 2 includes a longitudinal adjustment component and a metallographic sample clamp 27; the longitudinal adjustment component can drive the metallographic sample clamp 27 to move up and down, so that the soft metal metallographic sample clamped by the metallographic sample clamp 27 can contact with the conductive polishing disc 31 and form a certain pressure;

[0065] The electrochemical cleaning end assembly 4 includes a longitudinal adjustment component and a cathode; the longitudinal adjustment component can drive the cathode to move up and down, so that the distance between the cathode and the conductive polishing disc 31 can be adjusted;

[0066] The positive electrode of the high-frequency DC pulse power supply 7 is connected to the turntable spindle 33 and the conductive polishing disc 31 via the wire 6, the anode brush 8; the negative electrode is connected to the cathode 41 via the wire 6;

[0067] The motor and cylinder control system 5 is connected to the control ends of the sample clamping end assembly 2, the grinding and polishing end assembly 3, and the electrochemical cleaning end assembly 4 in a wireless or wired manner.

[0068] The electrolyte is sprayed from the electrolyte supply assembly 9 to the gap between the cathode 41 and the conductive polishing disc 31 .

[0069] The detailed structure and function of each component are as follows:

[0070] Workbench component 1:

[0071] The workbench assembly 1 is the supporting structure of the entire grinding and polishing platform. Figure 2 As shown, the workbench assembly 1 includes a workbench 11 and a water collecting tank 12, and the water collecting tank 12 is located above the workbench 11. Water collecting holes are provided on the workbench 11 and the water collecting tank 12, and the two water collecting holes are coaxial, connected to the drainage pipe, and are used to collect electrolyte and drain the electrolyte to the water storage tank 91 of the electrolyte supply assembly 9; shaft holes are provided on the workbench 11 and the water collecting tank 12, and the two shaft holes are coaxial, for installing the polishing end assembly 3.

[0072] Sample holding end assembly 2:

[0073] The sample clamping end assembly 2 is used to clamp the soft metal metallographic sample to be polished, and includes a longitudinal adjustment component and a metallographic sample clamp 27; the longitudinal adjustment component can drive the metallographic sample clamp 27 to move up and down, so that the soft metal metallographic sample clamped by the metallographic sample clamp 27 can contact the conductive polishing disc 31 and form a certain pressure.

[0074] The structure of the sample clamping end assembly 2 is as follows: Figure 3As shown, the sample clamping end assembly 2 is an n-shaped structure as a whole, including a sample end guide rail 21, a sample end slider 22, a sample end feed motor 23, a sample end connecting rod 24, a grinding and polishing motor 25, a pressure-adjustable cylinder 26 and a metallographic sample fixture 27. The sample end guide rail 21, the sample end slider 22, the sample end feed motor 23 and the sample end connecting rod 24 constitute a longitudinal adjustment component.

[0075] Driven by the sample end feed motor 23, the sample end slider 22 moves up and down along the sample end guide rail 21, and drives the sample end connecting rod 24, the polishing motor 25, the pressure adjustable cylinder 26 and the metallographic sample fixture 27 to move up and down along the Y direction.

[0076] The sample end guide rail 21 is fixed to the left side of the workbench 11, and the sample end slider 22 cooperates with the sample end guide rail 21 to move up and down;

[0077] The detailed structure is as follows:

[0078] The sample end guide rail 21 is fixed to the left side of the workbench 11; the sample end slider 22 cooperates with the sample end guide rail 21 to be able to move up and down; the sample end feed motor 23 is installed on the sample end guide rail 21, and its output end is directly or indirectly connected to the sample end slider 22, which can drive the sample end slider 22 to slide along the sample end guide rail 21 in the Y-axis direction.

[0079] One end of the sample end connecting rod 24 is fixed on the sample end slider 22, and the other end is installed with a grinding and polishing motor 25; the output end of the grinding and polishing motor 25 is connected to the metallographic sample fixture 27 via a pressure-adjustable cylinder 26. The output end of the pressure-adjustable cylinder 26 is connected to the metallographic sample fixture 27, which is used to adjust the contact pressure between the metallographic sample fixture 27 and the conductive grinding and polishing disc 31; the motor and cylinder control system 5 is connected to the control end of the pressure-adjustable cylinder 26 in a wireless or wired manner. The metallographic sample fixture 27 can rotate under the drive of the grinding and polishing motor 25.

[0080] The lower surface of the metallographic sample holder 27 is provided with a sample slot for mounting the soft metal metallographic sample to be ground and polished.

[0081] Since it is necessary to ensure that a certain contact pressure is always maintained between the soft metal metallographic sample and the polishing disc of the polishing end assembly 3 during the polishing process, in the present invention, it is more preferred to set the dovetail structure of the sample end guide rail 21 to cooperate with the dovetail groove provided in the sample end slider 22, which can ensure that the two are closely fitted, avoid the two being easily loosened during the polishing process, thereby ensuring the quality of the metallographic structure of the polished sample.

[0082] Grinding and polishing end component 3:

[0083] The polishing end assembly 3 is used for polishing soft metal metallographic samples. The polishing end assembly 3 is vertically mounted on the workbench 11 of the workbench assembly 1. The structure of the polishing end assembly 3 is as follows: Figure 4 As shown, the grinding and polishing end assembly 3 includes: a conductive grinding and polishing disc 31 , a turntable 32 , a turntable spindle 33 , and a turntable motor 34 .

[0084] The conductive polishing disc 31 is arranged on the upper surface of the turntable 32; the turntable main shaft 33 is vertically installed in the rotating shaft hole of the worktable 11 of the worktable assembly 1 through a bearing assembly, and its upper end is connected to the turntable 32, and the lower end is connected to the output shaft of the turntable motor 34, and can be driven to rotate by the turntable motor 34, thereby driving the turntable 32 to rotate; the conductive polishing disc 31 rotates with the turntable 32.

[0085] The turntable 32 can be a marble turntable or cast iron. The conductive polishing disc 31 can be bonded to the upper surface of the turntable 32 or fixed to the upper surface of the turntable 32 by bolts.

[0086] The conductive polishing disc 31 is formed by mixing and pressing abrasive grains, conductive fillers, and non-metallic binders, and is a polymer-based conductive high polymer material. The abrasive grains play the role of cutting metallographic sample materials, and can be aluminum oxide, cerium oxide, silicon carbide, cubic boron nitride (CBN), diamond, etc.; the conductive particles play the role of enhancing the conductive properties of the polishing disc, and can be graphite, carbon black, carbon nanotubes, graphene, carbon fiber, etc.; the non-metallic binder plays the role of bonding the abrasive grains and conductive particles, and can be phenolic resin, epoxy resin, polyimide resin, nitrile rubber, etc.

[0087] Electrochemical cleaning end assembly 4:

[0088] The electrochemical cleaning end assembly 4 is used to form an electrical path for electrochemically removing the adhesion on the surface of the conductive polishing disc 31, and includes a longitudinal adjustment component and a cathode; the longitudinal adjustment component can drive the cathode to move up and down, so that the distance between the cathode and the conductive polishing disc 31 can be adjusted;

[0089] The detailed structure of the electrochemical cleaning end assembly 4 is as follows Figure 5 As shown, the whole is an n-type structure, including a cathode 41, a cleaning end connecting rod 42, a cleaning end feeding motor 43, a cleaning end slider 44, and a cleaning end guide rail 45. The cleaning end connecting rod 42, the cleaning end feeding motor 43, the cleaning end slider 44, and the cleaning end guide rail 45 constitute a longitudinal adjustment component.

[0090] Driven by the cleaning end feed motor 43 , the cleaning end slider 44 can drive the cleaning end connecting rod 42 and the cathode 41 to move up and down along the Y direction, so as to adjust the distance between the cathode 41 and the conductive polishing disc 31 .

[0091] The cathode 41 may be a copper cathode, which is a hollow structure, such as Figure 5As shown, it consists of a cathode body and a cathode pressing plate. The upper surface of the cathode body is provided with a circular hole as an electrolyte inlet and a cathode terminal, and the lower surface is provided with a micro groove as an electrolyte injection outlet.

[0092] The cleaning end guide rail 45 is fixed to the right side of the workbench 11; the cleaning end slider 44 cooperates with the cleaning end guide rail 45; the cleaning end feed motor 43 is installed on the cleaning end guide rail 45, and its output end is directly or indirectly connected to the cleaning end slider 44, which can drive the cleaning end slider 44 to slide along the cleaning end guide rail 45 in the Y-axis direction.

[0093] The cleaning end guide rail 45 is a dovetail structure, and the cleaning end slider 44 is provided with a dovetail groove that cooperates with the dovetail structure; the dovetail structure of the cleaning end guide rail 45 cooperates with the dovetail groove of the cleaning end slider 44 to ensure that the two fit closely, avoiding the metallographic quality of the polished sample being affected due to looseness between the two during the polishing process.

[0094] Electrolyte supply assembly 9:

[0095] The electrolyte supply assembly 9 is used to supply electrolyte. The structure of the electrolyte supply assembly 9 is as follows: Figure 6 As shown, it includes a water storage tank 91, an electrolyte supply pump 92 and a water pipe 93.

[0096] The water storage tank 91 is placed at the lower left of the workbench 11; the electrolyte is supplied by the electrolyte supply pump 92, and is sprayed into the gap between the cathode 41 and the conductive polishing disc 31 through the water pipe 93 and the cathode 41, and is drained into the water storage tank 91 through the water collection holes on the workbench 11 and the water collection tank 12, thereby completing the electrolyte circulation.

[0097] Power supply components:

[0098] The high-frequency DC pulse power supply 7 is placed at the lower right of the workbench 11; its positive electrode is connected to the turntable spindle 33 and the conductive polishing disc 31 via the wire 6 and the anode brush 8; and its negative electrode is connected to the cathode 41 via the wire 6.

[0099] The motor and cylinder control system 5 is placed on the right side of the workbench 11, and is connected to the control ends of the sample end feed motor 23, the grinding and polishing motor 25, the turntable motor 34, the cleaning end feed motor 43, and the pressure-adjustable cylinder 26 by wireless or wired means, and is used to adjust the rotation speed of the sample end feed motor 23, the grinding and polishing motor 25, the turntable motor 34, and the cleaning end feed motor 43, as well as the pressure of the pressure-adjustable cylinder 26.

[0100] Working principle of the present invention:

[0101] Step S01: Mount the metallographic sample to be processed in the sample slot of the metallographic sample fixture 27 .

[0102] Step S02: Adjust the motor and cylinder control system 5 so that the sample end feed motor 23 runs at a certain speed, driving the sample end slider 22 to move downward along the Y direction on the surface of the sample end guide rail 21; when the metallographic sample contacts the conductive polishing disc 31, the sample end feed motor 23 stops working immediately.

[0103] Step S03: adjusting the motor and cylinder control system 5 to move the pressure-adjustable cylinder 26 downward along the Y direction, so that a certain contact pressure is formed between the metallographic sample and the conductive polishing disc 31 .

[0104] Step S04: Adjust the motor and cylinder control system 5 so that the cleaning end feed motor 43 runs at a certain speed, driving the cleaning end slider 44 to move downward along the Y direction on the surface of the cleaning end guide rail 45; when the distance between the lower surface of the cathode 41 and the conductive polishing disc 31 reaches the electrode gap threshold (the electrode gap threshold is 0.1-0.7mm), the cleaning end feed motor 43 stops working immediately.

[0105] The electrode gap is an important factor affecting the electrochemical cleaning efficiency of adhered metals. The smaller the electrode gap, the higher the current density and the higher the cleaning efficiency.

[0106] Step S05: Turn on the electrolyte supply pump 92 to spray the electrolyte from the water storage tank 91 through the water pipe 93 to the electrolyte outlet of the cathode 41. The sprayed electrolyte is collected by the water collection tank 12 and flows into the water storage tank 91 through the water collection holes on the workbench 11 and the water collection tank 12. In this way, the electrolyte forms a circulation.

[0107] Step S06: Turn on the high-frequency DC pulse power supply 7, set the working voltage, and make the current pass through the electrical path formed by the high-frequency DC pulse power supply 7, the conductive polishing disc 31, the turntable spindle 33, the anode brush 8, the copper cathode 41 and the wire 6. Thus, the electrical path for electrochemical cleaning of the conductive polishing disc 31 is formed.

[0108] Step S07: Adjust the motor and cylinder control system 5 to make the polishing motor 25 rotate at a certain speed n w The motor and cylinder control system 5 are adjusted to make the turntable motor 34 rotate at a certain speed n. s The turning table spindle 33 and the conductive polishing disc 31 are driven to rotate. Thus, the soft metal metallographic sample begins to be polished.

[0109] During the grinding and polishing process (i.e., step S07), soft metal abrasive chips will adhere to the surface of the conductive grinding and polishing disc 31, causing the surface abrasive particles to be passivated and the pores to be blocked. When the blocked area rotates with the conductive grinding and polishing disc 31 to the surface of the copper cathode 41, the adhesion in the blocked area will be electrochemically dissolved through step S06, achieving instant, efficient and non-destructive cleaning of the conductive grinding and polishing disc 31, so that its cutting ability can be maintained stably for a long time. Figure 7 shown.

[0110] Although the present invention has been disclosed as above with preferred embodiments, the embodiments are not intended to limit the present invention. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the content defined by the claims of this application.

Claims

1. A soft metal metallographic sample grinding and polishing platform based on the principle of anodic dissolution, characterized by: The soft metal metallographic sample grinding and polishing platform comprises: a workbench component (1), a sample clamping end component (2), a grinding and polishing end component (3), an electrochemical cleaning end component (4), a motor and cylinder control system (5), a high-frequency DC pulse power supply (7, an anode brush (8), and an electrolyte supply component (9); The workbench assembly (1) is the supporting structure of the entire grinding and polishing platform, and comprises a workbench (11) and a water collecting tank (12), and is provided with a rotating shaft hole for installing the grinding and polishing end assembly (3); The grinding and polishing end assembly (3) comprises a conductive grinding and polishing disc (31) and a turntable motor (34), wherein the conductive grinding and polishing disc (31) is driven by the turntable motor (34) to rotate in the water collecting tank (12); The sample clamping end assembly (2) comprises a longitudinal adjustment component and a metallographic sample clamp (27); the longitudinal adjustment component can drive the metallographic sample clamp (27) to move up and down, so that the soft metal metallographic sample clamped by the metallographic sample clamp (27) can contact with the conductive polishing disc (31) and form a certain pressure; The electrochemical cleaning end assembly (4) comprises a longitudinal adjustment component and a cathode (41); the longitudinal adjustment component can drive the cathode (41) to move up and down, so that the distance between the cathode (41) and the conductive polishing disc (31) can be adjusted; The positive electrode of the high-frequency DC pulse power supply (7) is connected to the turntable spindle (33) and the conductive polishing disc (31) via the anode brush (8); the negative electrode is connected to the cathode (41); The electrolyte is sprayed from the electrolyte supply assembly (9) to the gap between the cathode (41) and the conductive polishing disc (31); The motor and cylinder control system (5) is connected to the control ends of the sample clamping end assembly (2), the grinding and polishing end assembly (3), and the electrochemical cleaning end assembly (4) in a wireless or wired manner.

2. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 1 is characterized by: The sample clamping end assembly (2) further comprises: a grinding and polishing motor (25); The metallographic sample fixture (27) is connected to the output end of the grinding and polishing motor (25), and can perform rotational motion under the drive of the grinding and polishing motor (25).

3. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 1 or 2, characterized in that: The longitudinal adjustment components include: a guide rail, a slider, a feed motor, and a connecting rod; The guide rail is fixed on the workbench (11); the slider cooperates with the guide rail, and one end of the connecting rod is fixed on the slider; the feed motor is fixed on the guide rail, and its output end is connected to the slider and can drive the slider to move up and down along the guide rail.

4. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 3 is characterized by: The guide rail is a dovetail structure, and a dovetail groove matching the dovetail structure is arranged inside the slider.

5. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 3 is characterized by: The sample clamping end assembly (2) further comprises: a pressure-adjustable cylinder (26); The output end of the pressure-adjustable cylinder (26) is connected to a metallographic sample fixture (27) for adjusting the contact pressure between the metallographic sample fixture (27) and the conductive polishing disc (31); the motor and cylinder control system (5) is connected to the control end of the pressure-adjustable cylinder (26) in a wireless or wired manner.

6. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 1 is characterized by: The conductive polishing disc (31) is formed by mixing and pressing abrasive grains, conductive fillers and non-metallic binders.

7. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 1 is characterized by: The grinding and polishing end assembly (3) further comprises: a turntable (32) and a turntable spindle (33); The conductive polishing disc (31) is mounted on the upper surface of a turntable (32); the turntable main shaft (33) is vertically mounted in the rotating shaft hole of the worktable (11) of the worktable assembly (1) through a bearing assembly, the upper end of which is connected to the turntable (32), and the lower end of which is connected to the output shaft of the turntable motor (34), and can be driven to rotate by the turntable motor (34).

8. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 7 is characterized by: The turntable (32) is a marble turntable or a cast iron turntable.

9. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 1, characterized in that: The workbench (11) and the water collecting tank (12) are provided with water collecting holes for collecting electrolyte and draining the electrolyte to the electrolyte supply assembly (9); The electrolyte supply assembly (9) comprises a water storage tank (91), an electrolyte supply pump (92) and a water pipe (93); The electrolyte is supplied by an electrolyte supply pump (92), and is sprayed onto the gap between the cathode (41) and the conductive polishing disc (31) through a water pipe (93) and a cathode (41), and is then drained into the water storage tank (91) through water collection holes on the workbench (11) and the water collection tank (12).

10. The soft metal metallographic sample grinding and polishing platform based on the anodic dissolution principle according to claim 1, characterized in that: The cathode (41) is composed of a cathode body and a cathode pressing plate. The upper surface of the cathode body is provided with a circular hole as an electrolyte inlet and a cathode terminal, and the lower surface is provided with a micro groove as an electrolyte injection outlet.

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