Metallographic sample cleaning device and method suitable for full-automatic sample preparation

Abstract

The embodiment of the invention provides a metallographic specimen cleaning device and method suitable for full-automatic sample preparation, and the metallographic specimen cleaning device comprises a container which is of a cylindrical opening structure, the middle part of the bottom of the container is a circular plane, and an annular conical groove is formed between the cylindrical wall of the container and the circular plane; a vibration panel of the ultrasonic cleaning unit is the circular plane; the nozzles are arranged on the two side walls of the conical groove in pairs; the air compression unit is used for providing high-pressure gas for the nozzle; a pump body is arranged between the output end of the cleaning liquid unit and the nozzle and used for providing cleaning liquid for the nozzle, and the input end of the cleaning liquid unit communicates with the conical groove and used for filtering the cleaning liquid discharged from the conical groove; the nozzle is connected with the cleaning liquid unit and the air compression unit in a switchable mode. According to the embodiment of the invention, an efficient and thorough cleaning effect is brought to the metallographic sample for full-automatic sample preparation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallographic sample preparation, and in particular relates to a metallographic sample cleaning device and method suitable for full-automatic sample preparation. BACKGROUND

[0002] In order to improve the sample preparation efficiency and quality, and reduce the influence of the experience level of the operator on the sample, the metallographic sample preparation technology gradually develops from manual sample preparation to semi-automatic sample preparation, and then to the latest full-automatic metallographic sample preparation. The full-automatic metallographic sample preparation integrates rough grinding, fine grinding, rough polishing, fine polishing, and sample cleaning and drying. The full-automatic sample preparation technology sets the process parameters in advance, and grinds and polishes multiple samples on the chuck at one time. Therefore, the full-automatic sample preparation has very high requirements for the sample cleaning quality. If the sample is not cleaned or not cleaned completely after the completion of the previous process, the residual debris, particles or grinding fluid on the sample will contaminate the grinding and polishing disc of the subsequent process, which will result in the existence of shallow and disordered scratches on the metallographic sample, and finally affect the subsequent metallographic analysis result. In summary, in the full-automatic sample preparation process, the sample cleaning is a key link to ensure the quality of the metallographic sample preparation.

[0003] However, the full-automatic metallographic grinding and polishing technology has the following problems in the actual operation process: 1) the cleaning medium will be quickly contaminated by the debris, slag and polishing agent generated in the grinding and polishing process, so that the cleaning capacity will rapidly decrease, and the cleaning medium has to be frequently replaced; 2) for the cracked sample and the gap between the sample and the clamp, the cleaning capacity is not enough, and the contaminants in the cracks or gaps will gradually seep out in the later period, which will affect the final sample preparation quality; 3) the cleaning and drying capacity is low, which will not only affect the sample preparation efficiency, but also easily cause the rusting of the sample surface; and 4) when the compressed air is used for cleaning and drying, the oil stains, dust and water vapor in the compressed air will contaminate the metallographic surface of the sample, which will cause the defects such as round pits, round dots and local water yellowing on the metallographic surface of the sample. SUMMARY

[0004] In view of the above problems, the present application provides a metallographic sample cleaning device and method suitable for full-automatic sample preparation.

[0005] The object of the present application can be achieved by the following scheme:

[0006] In a first aspect, the present application provides a metallographic sample cleaning device suitable for full-automatic sample preparation, comprising:

[0007] The container is a cylindrical open structure, the middle part of the bottom of the container is a circular plane, and the cylindrical wall of the container and the circular plane form an annular conical groove;

[0008] The ultrasonic cleaning unit has a vibrating panel, and the vibrating panel is the circular plane;

[0009] An even number of nozzles are arranged in pairs on the two side walls of the conical groove;

[0010] An air compression unit is configured to provide high-pressure gas to the nozzles;

[0011] A cleaning liquid unit is configured to provide cleaning liquid to the nozzles via a pump body, and to filter the cleaning liquid discharged from the conical groove via a communication between an input end of the cleaning liquid unit and the conical groove;

[0012] The nozzles are switchably connected to the cleaning liquid unit and the air compression unit, respectively.

[0013] Further, the ultrasonic cleaning unit further comprises a transducer and a generator.

[0014] The transducer is connected to the generator, and is configured to convert a high-frequency electromagnetic oscillation signal transmitted by the generator into a high-frequency vibration and transmit the high-frequency vibration to the vibration panel.

[0015] Further, the cleaning liquid unit comprises a tank, a magnetic water separator, and a microporous filter.

[0016] The tank is configured to contain cleaning liquid.

[0017] The microporous filter is arranged at a side of a liquid outlet of the tank and inside the tank, and is configured to filter particulate matter and non-magnetic impurities in the cleaning liquid, wherein a minimum filter pore size of the microporous filter is 1 μm.

[0018] The magnetic water separator is arranged at a side of a liquid inlet of the tank and outside the tank, and is configured to filter metal impurities in the cleaning liquid discharged from the conical groove.

[0019] Further, the magnetic water separator is in communication with the conical groove and the liquid inlet of the tank via a hose, respectively; the pump body is in communication with the nozzles via a hose, and the pump body is in communication with the microporous filter via a hose passing through the liquid outlet of the tank.

[0020] Further, the pump body is a plunger pump.

[0021] Further, the air compression unit comprises a screw air compressor and an air filter device.

[0022] The air filter device is arranged at an air inlet of the screw air compressor, and is configured to filter particulate matter in air, wherein a minimum filter pore size of the air filter device is 1 μm.

[0023] The screw air compressor has a gas storage capacity of 100 L to 200 L, a maximum exhaust pressure of 10×105 Pa, and a maximum exhaust temperature of 100℃.

[0024] Further, the air outlet of the screw air compressor is communicated with the nozzle through a hose.

[0025] Further, the number of the nozzles is 8, and the nozzles are evenly distributed in 4 pairs at 90° in the circumferential direction of the conical groove.

[0026] In the second aspect, the application provides a metallographic specimen cleaning method suitable for full-automatic sample preparation, which is realized based on the metallographic specimen cleaning device of any one of the first aspect.

[0027] After the coarse grinding process is completed, the cleaning liquid unit sprays cleaning liquid on the metallographic specimen rotating above the container through the nozzle;

[0028] After the fine grinding process is completed, the metallographic specimen is moved into the cleaning liquid in the container, the ultrasonic cleaning unit is started, and cleaning is performed for a first preset time; after cleaning is completed, the metallographic specimen rises and rotates, the cleaning liquid in the container is discharged through the cleaning liquid unit, and the cleaning liquid unit sprays cleaning liquid on the metallographic specimen through the nozzle;

[0029] After the coarse polishing process is completed, the cleaning liquid unit sprays cleaning liquid on the metallographic specimen rotating above the container through the nozzle;

[0030] After the fine polishing process is completed, the metallographic specimen is moved into the cleaning liquid in the container, the ultrasonic cleaning unit is started, and cleaning is performed for a second preset time; after cleaning is completed, the metallographic specimen rises and rotates, the cleaning liquid in the container is discharged through the cleaning liquid unit, and the cleaning liquid unit sprays cleaning liquid on the metallographic specimen through the nozzle; the air compression unit sprays compressed air on the metallographic specimen through the nozzle for a third preset time, to complete cleaning and drying.

[0031] Further, before the cleaning liquid unit sprays cleaning liquid on the metallographic specimen rotating above the container through the nozzle after the coarse grinding process is completed, the method further includes:

[0032] According to the coarse grinding, fine grinding, coarse polishing, and fine polishing processes, cleaning parameters of the metallographic specimen are set; wherein the cleaning parameters include: cleaning liquid type, cleaning liquid spraying pressure, cleaning liquid cleaning time, compressed air spraying pressure, compressed air spraying time, and ultrasonic cleaning time.

[0033] Compared with the prior art, the application has the following beneficial effects:

[0034] The embodiment of the present application can continuously provide filtered cleaning liquid for the nozzle through the cleaning liquid unit, without frequent replacement of the cleaning liquid, thereby ensuring the continuous stability of the cleaning capacity; the ultrasonic cleaning unit can deeply clean the pollutants in the crack sample and the stains in the gap between the metallographic sample and the clamp, thereby avoiding the seepage problem of the later pollutants and ensuring the cleanliness of the metallographic sample and the accuracy of the subsequent analysis; the air compression unit can provide pressurized air for the nozzle, which not only rapidly dries the residual liquid on the surface of the metallographic sample, but also effectively blows away the fiber debris and other stains remaining on the surface of the metallographic sample, thereby improving the cleaning effect.

[0035] Further, the cleaning liquid unit, the ultrasonic cleaning unit and the air compression unit are integrated in the same station in the embodiment of the present application, thereby avoiding the repeated movement of the sample chuck between different stations, significantly improving the cleaning efficiency, simplifying the operation process, and reducing the risk of damage to the metallographic sample caused by frequent movement. The integrated design, continuous and stable cleaning capacity and targeted deep cleaning of the embodiment of the present application bring efficient and thorough cleaning effect to the full-automatic sample preparation metallographic sample.

[0036] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and achieved by the structures indicated in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0038] Figure 1 It is a structure schematic view of a metallographic sample cleaning device suitable for full-automatic sample preparation in the embodiment of the present application;

[0039] Figure 2 It is a top view of the nozzle position at the bottom of the container in the embodiment of the present application;

[0040] Figure 3 It is a polished state microscopic photograph of the metallographic sample finally obtained after preparation in the third embodiment of the present application;

[0041] Figure 4 It is a polished state microscopic photograph of the crack metallographic sample finally obtained after preparation in the fourth embodiment of the present application;

[0042] In the figure, 1-container; 2-nozzle; 3-pump body; 4-ultrasonic cleaning unit; 41-vibration panel; 42-transducer; 43-generator; 5-cleaning liquid filtering unit; 51-tank; 52-magnetic water separator; 53-micro-porous filter; 54-tank liquid inlet; 55-tank liquid outlet; 6-air compression unit; 61-screw air compressor; 62-air filter; 7-hose; 8-metallographic sample; 9-sample chuck. DETAILED DESCRIPTION

[0043] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0044] The embodiments of the present application provide a metallographic sample cleaning device and method suitable for full-automatic sample preparation, and the metallographic sample cleaning device comprises:

[0045] The container is a cylindrical open structure, the middle part of the bottom of the container is a circular plane, and an annular conical groove is arranged between the cylindrical wall of the container and the circular plane;

[0046] The ultrasonic cleaning unit has a vibration panel which is the circular plane;

[0047] An even number of nozzles are arranged in pairs on the two side walls of the conical groove;

[0048] An air compression unit is arranged to provide high-pressure gas to the nozzles;

[0049] A cleaning liquid unit is arranged, and a pump body is arranged between the output end of the cleaning liquid unit and the nozzles to provide cleaning liquid to the nozzles, and the input end of the cleaning liquid unit is communicated with the conical groove to filter the cleaning liquid discharged from the conical groove;

[0050] The nozzles are switchably connected to the cleaning liquid unit and the air compression unit respectively.

[0051] The embodiment of the present invention can continuously provide filtered cleaning liquid to the nozzle through the cleaning liquid unit, without the need for frequent replacement of the cleaning liquid, thereby ensuring the continuous stability of the cleaning ability; the ultrasonic cleaning unit is adopted, which can deeply clean the contaminants in the crack sample and the stains in the gap between the metallographic sample and the fixture, thereby avoiding the problem of late seepage of contaminants, ensuring the cleanliness of the metallographic sample and the accuracy of subsequent analysis; the air compressor unit can provide pressurized air to the nozzle, which not only allows the residual liquid on the surface of the metallographic sample to be quickly dried, but also can effectively blow away stains such as fiber debris remaining on the surface of the metallographic sample, thereby improving the cleaning effect.

[0052] Furthermore, the embodiments of the present invention integrate the cleaning fluid unit, ultrasonic cleaning unit, and air compressor unit into the same workstation, eliminating the need for repeated movement of the sample chuck between different workstations. This significantly improves cleaning efficiency, simplifies the operational process, and reduces the risk of damage to metallographic specimens caused by frequent movement. Through its integrated design, sustained and stable cleaning capabilities, and targeted deep cleaning, the embodiments of the present invention achieve efficient and thorough cleaning results for fully automated metallographic specimen preparation.

[0053] Example 1

[0054] The following combination Figure 1 and Figure 2 , the structure and working principle of a metallographic sample cleaning device suitable for fully automatic sample preparation provided by the present invention are explained.

[0055] In conjunction with the embodiments of the present invention, refer to Figure 1 The metallographic sample cleaning device includes a container 1, an even number of nozzles 2, a pump body 3, an ultrasonic cleaning unit 4, a cleaning liquid unit 5, an air pressure unit 6 and a plurality of connecting hoses 7.

[0056] Container 1 is a cylindrical open structure with a diameter of 150mm-200mm and a depth of 100mm-150mm. The center of the bottom of container 1 is a circular plane. Between the cylindrical wall of container 1 and the circular plane is an annular conical groove. The cone apex angle of the conical groove is 130°-160°, and the cone top surface is flush with the circular plane of container 1.

[0057] An even number of nozzles 2 are arranged in pairs on both side walls of the tapered groove. Figure 2 The number of nozzles 2 is 8 and they are divided into 4 pairs and evenly distributed at 90 degrees around the circumference of the tapered groove. The direction of the nozzles 2 is adjustable, which can focus on cleaning the metallographic sample 8 on the sample chuck 9, ensuring a uniform and thorough cleaning effect.

[0058] The ultrasonic cleaning unit 4 comprises a vibrating panel 41, a transducer 42 and a generator 43; the vibrating panel 41 is a circular plane at the bottom of the container 1, which is compact in structure and has good ultrasonic cleaning effect; the transducer 42 is arranged between the vibrating panel 41 and the generator 43 and connected with both, and is used to convert the high-frequency electromagnetic oscillation signal transmitted by the generator 43 into high-frequency vibration and transmit the high-frequency vibration to the vibrating panel 41. In use, when the container 1 is filled with cleaning liquid and the liquid level in the container 1 reaches a certain height, the sample chuck 9 immerses the metallographic sample into the cleaning liquid, and the ultrasonic cleaning unit 4 is started to deeply clean the metallographic sample 8. The pollutants in the crack sample and the stains in the gap between the sample and the clamp can be deeply cleaned, so that the problem of seepage of the later pollutants is avoided, and the cleanliness of the metallographic sample and the accuracy of the subsequent analysis are ensured.

[0059] In combination with the embodiments of the present application, refer to Figure 1 The output end of the cleaning liquid unit 5 is provided with the pump body 3 between the pump body 3 and the nozzle 2, which is used to provide uniform and stable high-pressure cleaning liquid to the nozzle 2; the input end of the cleaning liquid unit 5 is communicated with the conical groove, which is used to filter the cleaning liquid discharged from the conical groove. The pump body 3 can be a plunger pump, which can provide a maximum pressure of 7x10 5 Pa.

[0060] Specifically, the cleaning liquid unit 5 comprises a box body 51, a magnetic water separator 52 and a microporous filter 53; the box body 51 is used to contain cleaning liquid, and the capacity of the box body 51 is 20-30L; the box body 51 comprises a box body liquid outlet 55 arranged at the upper portion and a box body liquid inlet 54 arranged at the lower portion and the side edge. The microporous filter 53 is arranged inside the box body 51 and at the side edge of the box body liquid outlet 55, and is used to filter the small particles and non-magnetic impurities in the cleaning liquid; the minimum filter pore size of the microporous filter 53 is 1μm. The magnetic water separator 52 is arranged outside the box body 51 and at the side edge of the box body liquid inlet 54, and is used to filter the metal impurities such as iron slag generated in the grinding process. Therefore, the cleaning liquid unit can continuously provide filtered cleaning liquid to the nozzle, and the cleaning liquid does not need to be frequently replaced, so that the continuous and stable cleaning ability is ensured.

[0061] The output end of the cleaning liquid unit 5 is provided with the pump body 3, specifically, the pump body 3 is communicated with the nozzle 2 through the hose 7, the pump body 3 is communicated with the microporous filter 53 through the hose 7 passing through the box body liquid outlet 55, and the microporous filter 53 is communicated with the cleaning liquid inside the box body 51 through the hose 7. The input end of the cleaning liquid unit 5 is communicated with the conical groove, specifically, the magnetic water separator 52 is communicated with the conical groove and the box body liquid inlet 54 through the hose 7.

[0062] The cleaning liquid unit 5 is arranged in parallel as multiple groups, which is used to store different kinds of cleaning liquid, such as water, ethanol or soap water, etc.

[0063] In use, the cleaning liquid unit 5 can provide uniform, stable high-pressure cleaning liquid to the nozzle 2 through the pump body 3, and the cleaning liquid in the container 1 is filtered by the magnetic water separator 52 through the hose 7 and then returned to the tank 51; wherein the tank inlet 54 of the cleaning liquid unit 5 can be selected to be opened or closed according to actual use. The cleaning liquid unit 5 can also continuously add cleaning liquid, such as anhydrous ethanol, into the container 1 through the nozzle 2, so as to perform deep cleaning after the ultrasonic cleaning unit 4 is started, at which time the cleaning liquid unit 5 closes the inlet 54, and the use pressure of the pump body 3 is adaptively adjusted.

[0064] In combination with the embodiments of the present application, reference is made to Figure 1 The air compression unit 6 includes a screw air compressor 61 and an air filter device 62; the air filter device 62 is arranged at the air inlet of the screw air compressor 61 and is used to filter small particulate matters in the air, and the minimum filter aperture of the air filter device 61 is 1 μm; the gas storage capacity of the screw air compressor 61 is 100 L-200 L, the maximum exhaust pressure is 10×10 5 Pa, and the maximum exhaust temperature is 100℃. The air outlet of the screw air compressor 61 is communicated with the nozzle 2 through a hose, which is used to provide clean and dry high-pressure gas to the nozzle 2. The air compression unit can provide pressurized air to the nozzle, which not only rapidly dries the residual liquid on the surface of the metallographic sample, but also effectively blows away the fiber debris and other stains remaining on the surface of the metallographic sample, thereby improving the cleaning effect.

[0065] The nozzle 2 is switchably connected with the cleaning liquid unit 5 and the air compression unit 6. Specifically, when it is needed to spray cleaning liquid on the metallographic sample 8, and when it is needed to add cleaning liquid into the container 1, the nozzle 2 is communicated with the cleaning liquid unit 5; when it is needed to spray compressed air with certain pressure and temperature on the metallographic sample 8, the nozzle 2 is communicated with the air compression unit 6.

[0066] Embodiment two

[0067] In combination with the embodiments of the present application, a metallographic sample cleaning method suitable for full-automatic sample preparation is described. The method is realized based on the metallographic sample cleaning device described in the above embodiment one.

[0068] Step S100: after the rough grinding process is completed, the cleaning liquid unit 5 sprays cleaning liquid on the metallographic sample 8 rotating above the container 1 through the nozzle 2;

[0069] Before step S100, the cleaning parameters are set according to the rough grinding, fine grinding, rough polishing and fine polishing processes; the cleaning parameters include: cleaning liquid type, cleaning liquid spraying pressure, cleaning liquid cleaning time, compressed air spraying pressure, compressed air spraying time, ultrasonic cleaning time. The directions of the nozzles 2 arranged in pairs at the bottom of the container 1 are adjusted to ensure that they can accurately spray the multiple metallographic samples 8 on the sample chuck 9.

[0070] In step S100, after the rough grinding process is completed, the metallographic sample 8 is moved above the cleaning container 1 and rotates at a certain speed, and then slowly descends.

[0071] The cleaning liquid unit 5 is started, and a certain pressure of water flow is continuously sprayed to the metallographic sample 8 through the nozzle 2 for about 10s to 30s. After step S100 is completed, the sample enters the fine grinding process.

[0072] Step S200: After the fine grinding process is completed, the metallographic sample is moved into the cleaning liquid in the container, and the ultrasonic cleaning unit is started to clean for a first preset time; after cleaning is completed, the metallographic sample rises and rotates, the cleaning liquid in the container is discharged through the cleaning liquid unit, and the cleaning liquid unit sprays the cleaning liquid to the metallographic sample through the nozzle;

[0073] The cleaning liquid unit 5 closes the liquid inlet 54 of the box body, and continuously adds anhydrous ethanol into the container 1 until the liquid level reaches 30mm to 50mm.

[0074] After the fine grinding is completed, the metallographic sample 8 is moved downward into the cleaning liquid.

[0075] The ultrasonic cleaning unit 4 is started to deeply clean the sample 8 for about 30s to 60s. After cleaning is completed, the sample chuck 9 rises and starts to rotate.

[0076] At the same time, the cleaning liquid filtering unit 5 discharges the cleaning liquid to expose the nozzles 2 at the bottom. The cleaning liquid unit 5 sprays a certain pressure of anhydrous ethanol to the metallographic sample 8 through the nozzles 2 for about 10s to 30s. Thereafter, the sample enters the rough polishing process.

[0077] Step S300: After the rough polishing process is completed, the cleaning liquid unit sprays the cleaning liquid to the metallographic sample rotating above the container through the nozzle;

[0078] After the rough polishing process is completed, the sample 8 is again moved above the container 1 to rotate at a certain speed and descend. The cleaning liquid filtering unit 5 sprays soap water or anhydrous ethanol to the sample 8 through the nozzles 2 for about 10s to 30s.

[0079] Subsequently, the sample rises and rotates at a high speed for 10s to 30s. After this step is completed, the sample enters the fine polishing process.

[0080] Step S400: After the fine polishing process is completed, the metallographic sample is moved to the cleaning liquid in the container, the ultrasonic cleaning unit is started, and cleaning is performed for a second preset time; after cleaning is completed, the metallographic sample rises and rotates, the cleaning liquid in the container is discharged through the cleaning liquid unit, and the cleaning liquid unit sprays the cleaning liquid to the metallographic sample through the nozzle; the air compression unit sprays compressed air to the metallographic sample through the nozzle for a third preset time, completing cleaning and drying.

[0081] The cleaning liquid unit 5 closes the tank liquid inlet 54, and continues to add anhydrous ethanol or soap water into the container 1 until the set liquid level is reached.

[0082] After fine polishing, the metallographic sample 8 is immersed in the cleaning liquid and ultrasonic cleaning is performed for about 30 to 60 seconds.

[0083] After cleaning is completed, the metallographic sample 8 rises and rotates. The cleaning liquid is discharged, and the bottom nozzle 2 is exposed. Then, a certain pressure of anhydrous ethanol is sprayed to the metallographic sample 8 through the nozzle 2 for the last cleaning, lasting about 10 to 30 seconds.

[0084] Finally, the air compression unit 6 sprays compressed air of a certain pressure and temperature to the metallographic sample 8 through the nozzle 2, lasting about 10 to 30 seconds, and the sample completes the final cleaning and drying.

[0085] Example Three

[0086] The device described in Example One and the method described in Example Two are applied to clean a group of pipe body metallographic samples with a specification of Ф244.48x8.94mm LC J55 casing during preparation, and the specific steps are as follows:

[0087] 1) Step 1: Set parameters and adjust nozzles;

[0088] According to the metallographic samples in different processing stages (coarse grinding, fine grinding, rough polishing, and fine polishing), the corresponding cleaning parameters are set. The specific cleaning parameters are shown in Table 1.

[0089] Table 1 Cleaning parameters of different processing stages in Example Three

[0090]

[0091] Adjust the direction of the four pairs of nozzles at the bottom of the cleaning container to ensure that they can accurately spray the multiple samples on the clamp.

[0092] 2) Step 2: Cleaning after coarse grinding;

[0093] After the coarse grinding process is completed, the sample is moved above the cleaning container and rotates at a certain speed, and then slowly descends.

[0094] The cleaning liquid unit is activated and the sample is continuously sprayed through the nozzles with 6 x 10 5 Pa pressure for approximately 15 s. After this step, the sample enters the fine grinding process.

[0095] 3) Step 3: Cleaning after fine grinding;

[0096] During fine grinding, the cleaning liquid unit closes the tank inlet and continuously adds anhydrous ethanol into the container until the liquid level reaches 40 mm. After fine grinding, the sample is lowered into the cleaning liquid.

[0097] The ultrasonic cleaning unit is activated and the sample is deeply cleaned for approximately 30 s.

[0098] After cleaning, the sample holder is raised and starts to spin.

[0099] At the same time, the cleaning liquid filter unit discharges the cleaning liquid and exposes the nozzles at the bottom. The cleaning liquid filter unit again sprays the sample through the nozzles with 5 x 10 5 Pa pressure of anhydrous ethanol for approximately 15 s. After this, the sample enters the rough polishing process.

[0100] 4) Step 4: Cleaning after rough polishing;

[0101] After the rough polishing process, the sample is again moved above the container and spins at a certain speed while descending. The cleaning liquid unit sprays the sample through the nozzles with 6 x 10 5 Pa pressure of anhydrous ethanol for approximately 15 s. Subsequently, the sample is raised and spins at high speed for 15 s. After this step, the sample enters the fine polishing process.

[0102] 5) Step 5: Cleaning and drying after fine polishing;

[0103] During fine polishing, the cleaning liquid unit closes the tank inlet and continuously adds anhydrous ethanol or soap water into the container until the set liquid level is reached.

[0104] After fine polishing, the sample is immersed in the cleaning liquid and ultrasonically cleaned for approximately 30 s. After cleaning, the sample is raised and spins. The cleaning liquid is discharged and the nozzles at the bottom are exposed.

[0105] Then, the sample is sprayed through the nozzles with 5 x 10 5 Pa pressure of anhydrous ethanol for the final cleaning for approximately 15 s.

[0106] Finally, the air pressure unit sprays the sample through the nozzles with 6 x 10 5 Pa pressure of dry compressed air for approximately 20 s, completing the final cleaning and drying of the sample.

[0107] The polished state morphology of the metallographic sample is observed under a metallurgical microscope at 200 times, and the metallographic photograph is as shown in Figure 3 .

[0108] Example Four

[0109] The device described in Example One and the method described in Example Two are applied to the cleaning of a pipe body crack metallographic sample of steel grade L360 during preparation, and the specific steps are as follows:

[0110] 1) Step 1: Setting parameters and nozzle adjustment;

[0111] According to the metallographic samples of different processing stages (coarse grinding, fine grinding, coarse polishing, and fine polishing), the corresponding cleaning parameters are set. The specific cleaning parameters are shown in Table 2.

[0112] Table 2: Cleaning parameters of different processing stages in Example Four

[0113]

[0114] The directions of the four pairs of nozzles at the bottom of the cleaning container are adjusted to ensure that they can accurately spray the multiple samples on the fixture.

[0115] 2) Step 2: Cleaning after coarse grinding;

[0116] After the coarse grinding process is completed, the sample is moved above the cleaning container and rotates at a certain speed, and then slowly descends. The cleaning liquid unit is started, and the nozzle continuously sprays a water flow with a pressure of 6×10 5 Pa for about 30s. After this step is completed, the sample enters the fine grinding process.

[0117] 3) Step 3: Cleaning after fine grinding;

[0118] During fine grinding, the cleaning liquid unit closes the liquid inlet of the box and continuously adds anhydrous ethanol into the container until the liquid level reaches 40mm. After fine grinding is completed, the sample is moved down to the cleaning liquid. The ultrasonic cleaning unit is started to clean the sample deeply for about 50s.

[0119] After cleaning is completed, the sample fixture rises and starts to rotate. At the same time, the cleaning liquid filtration unit discharges the cleaning liquid, exposing the nozzles at the bottom. The cleaning liquid filtration unit again sprays anhydrous ethanol with a pressure of 5×10 5 Pa through the nozzles to the sample for about 20s. After that, the sample enters the coarse polishing process.

[0120] 4) Step 4: Cleaning after coarse polishing;

[0121] After the coarse polishing process is completed, the sample is again moved above the container and rotates at a certain speed and descends. The cleaning liquid unit sprays 6×10 5Pa pressure of absolute ethanol for about 30 s. Subsequently, the sample is raised and spun at high speed for 15 s. After this step, the sample enters the final polishing process.

[0122] 5) Step 5: cleaning and drying after polishing;

[0123] During the polishing process, the cleaning liquid unit closes the tank inlet and continuously adds absolute ethanol or soapy water into the container until the set liquid level is reached. After the polishing is completed, the sample is immersed in the cleaning liquid and ultrasonic cleaning is performed for about 50 s. After cleaning is completed, the sample is raised and spun. The cleaning liquid is discharged and the bottom nozzle is exposed. Then, 5 x 10 5 Pa pressure of absolute ethanol for about 20 s.

[0124] Finally, the air pressure unit sprays 6 x 10 5 Pa pressure of dry compressed air for about 50 s, and the sample is finally cleaned and dried.

[0125] The polished state morphology of the sample is observed under a metallurgical microscope at 100 times, and the metallurgical photograph is shown in Fig. 2. Figure 4

[0126] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.​

Claims

1. A metallographic specimen cleaning device suitable for full automation of specimen preparation, characterized in that, The method comprises the following steps: A container (1) is provided, which is a cylindrical open structure, the middle part of the bottom of the container (1) is a circular plane, and an annular conical groove is formed between the cylindrical wall of the container (1) and the circular plane; An ultrasonic cleaning unit (4) is provided, the vibration panel (41) of the ultrasonic cleaning unit (4) is the circular plane; An even number of nozzles (2) are provided, which are arranged in pairs on the two side walls of the conical groove; An air compression unit (6) is provided, which is used to provide high-pressure gas to the nozzles (2); A cleaning liquid unit (5) is provided, a pump body (3) is arranged between the output end of the cleaning liquid unit (5) and the nozzles (2) to provide cleaning liquid to the nozzles (2), and the input end of the cleaning liquid unit (5) is communicated with the conical groove to filter the cleaning liquid discharged from the conical groove; The nozzles (2) are switchably connected to the cleaning liquid unit (5) and the air compression unit (6) respectively.

2. The metallographic specimen cleaning apparatus of claim 1, wherein The ultrasonic cleaning unit (4) further comprises a transducer (42) and a generator (43); The transducer (42) is connected to the generator (43), and the transducer (42) is used to convert the high-frequency electromagnetic oscillation signal transmitted by the generator (43) into high-frequency vibration and transmit the high-frequency vibration to the vibration panel (41).

3. The metallographic specimen cleaning apparatus of claim 1, wherein The cleaning liquid unit (5) comprises a box body (51), a magnetic water separator (52), and a microporous filter (53); The box body (51) is used to contain cleaning liquid; The microporous filter (53) is arranged inside the box body (51) and on the side of the box body liquid outlet (55), and is used to filter particulate matter and non-magnetic impurities in the cleaning liquid; wherein the minimum filtering pore size of the microporous filter (53) is 1 μm; The magnetic water separator (52) is arranged outside the box body (51) and on the side of the box body liquid inlet (54), and is used to filter metal impurities in the cleaning liquid discharged from the conical groove.

4. The metallographic specimen cleaning apparatus of claim 3, wherein The magnetic water separator (52) is communicated with the conical groove and the box body liquid inlet (54) by a hose respectively; the pump body (3) and the nozzles (2) are communicated by a hose, and the pump body (3) and the microporous filter (53) are communicated by a hose passing through the box body liquid outlet (55).

5. The metallographic specimen cleaning apparatus of claim 4, wherein, The pump body (3) is a plunger pump.

6. The metallographic specimen cleaning apparatus of claim 1, wherein The air compression unit (6) comprises a screw air compressor (61) and an air filter device (62); The air filter device (62) is arranged at the air inlet of the screw air compressor (61), and is used to filter particulate matter in the air; and the minimum filtering pore size of the air filter device (62) is 1 μm; The screw air compressor (61) has a gas storage capacity of 100L-200L and a maximum exhaust pressure of 10x10 5 Pa, and a maximum exhaust temperature of 100℃.

7. The metallographic specimen cleaning apparatus of claim 6, wherein The air outlet of the screw air compressor (61) is communicated with the nozzles (2) by a hose (7).

8. The metallographic specimen cleaning apparatus of claim 1, wherein, The number of the nozzles (2) is 8, and the nozzles (2) are evenly distributed at an angle of 90° in the circumferential direction of the conical groove in four pairs.

9. A method for cleaning a metallographic specimen suitable for fully automatic specimen preparation, characterized in that The method is realized based on the metallographic specimen cleaning device according to any one of claims 1 to 8, and the method comprises the following steps: After the rough grinding process is completed, the cleaning liquid unit sprays cleaning liquid on the metallographic specimen rotating above the container through the nozzles. After the fine grinding process is completed, the metallographic sample is moved to the cleaning liquid in the container, the ultrasonic cleaning unit is started, and cleaning is performed for a first preset time; after cleaning is completed, the metallographic sample rises and rotates, the cleaning liquid in the container is discharged through the cleaning liquid unit, and the cleaning liquid unit sprays the metallographic sample with cleaning liquid through the nozzle; After the coarse polishing process is completed, the cleaning liquid unit sprays the metallographic sample rotating above the container with cleaning liquid through the nozzle; After the fine polishing process is completed, the metallographic sample is moved to the cleaning liquid in the container, the ultrasonic cleaning unit is started, and cleaning is performed for a second preset time; after cleaning is completed, the metallographic sample rises and rotates, the cleaning liquid in the container is discharged through the cleaning liquid unit, and the cleaning liquid unit sprays the metallographic sample with cleaning liquid through the nozzle; the air compression unit sprays compressed air to the metallographic sample through the nozzle for a third preset time, completing cleaning and drying.

10. The metallographic specimen cleaning method of claim 9, wherein, Before the method sprays the metallographic sample rotating above the container with cleaning liquid through the nozzle after the coarse grinding process is completed, the method further includes: According to the coarse grinding, fine grinding, coarse polishing, and fine polishing processes, cleaning parameters are set for the metallographic sample; wherein the cleaning parameters include: cleaning liquid type, cleaning liquid spraying pressure, cleaning liquid cleaning time, compressed air spraying pressure, compressed air spraying time, and ultrasonic cleaning time.

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