Black tungsten filament electrolysis white washing device
By adopting the design of alternately inserting electrolytic pole sheets and filtering devices in the black tungsten wire electrolysis and whitening device, the problems of low electrolytic efficiency and difficult elements are solved, and the smoothness of the tungsten wire surface is improved and the production process is simplified. In order to efficiently produce diamond lines.
Patent Information
- Application Number
- CN202420295435.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-18
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-02-18
AI Technical Summary
In the prior art, the electrolytic washing efficiency of black tungsten wire is low, and it is difficult to completely remove elements C and O elements, resulting in the smoothness of the surface of the tungsten wire that cannot be improved.
A black tungsten wire electrolysis and whitening device is designed, and an alkaline washing electrolytic cell is arranged in at least two rows of sequential order. The current loop is formed by inserting electrolytic pole sheets with different charges. Combined with the filtering device and heat treatment, the electrolytic efficiency and cleaning effect are enhanced.
It improves electrolytic efficiency, can remove the graphite layer more thoroughly, improves the smoothness of the surface of the tungsten wire, and simplifies the production process, suitable for direct production of high-quality diamond wires.
Smart Images
Figure CN222160448U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tungsten wire cleaning, in particular to a black tungsten wire electrolytic whitening device. Background Art
[0002] With the rapid development of the semiconductor industry and the wide application of the photovoltaic industry, the application of hard and brittle materials is becoming more and more extensive, and the processing requirements for hard and brittle materials are becoming more and more stringent, especially for silicon wafers, whose precision cutting processing is more stringent; At present, the free abrasive wire saw cutting technology is mainly used in the cutting of hard and brittle materials such as silicon crystals, that is, a slurry with abrasive (diamond or silicon carbide slurry) is fed to the steel wire while cutting. However, the free abrasive wire saw cutting technology has the defects of low cutting efficiency, large surface roughness, difficult recycling, and easy pollution of the environment. At present, the diamond wire cutting technology has attracted much attention. Diamond wire cutting technology has the advantages of high cutting efficiency, small wire marks, smooth surface, and low pollution. In addition, with the popularization of domestic diamond wires, the price of diamond wires has also tended to be affordable. However, facing the trend of thinning silicon wafers, the performance requirements of diamond wires are getting higher and higher. Industry experts believe that the development ideas of diamond wires are basically "fourizations", namely thinning, fast cutting, wire saving and low TTV (Total Thickness Variation). In order to achieve these goals, tungsten matrix mother wire diamond wire has become the first choice for the development of diamond wires. For diamond manufacturers, using lower-priced black tungsten wire is a direct way to reduce costs.
[0003] The main size of the black tungsten wire electrolytic whitening is 0~45um; the production process of black tungsten wire is to extract ammonium paratungstate from tungsten ore and reduce it to obtain tungsten powder, and then obtain tungsten wire through isostatic pressing and vertical melting sintering, and finally forging and drawing to obtain tungsten wire; graphite is most commonly used as a lubricant in the wire drawing process, so the surface of the drawn tungsten wire is black, so it is called black tungsten wire. The black tungsten wire is directly electroplated and sanded to produce diamond wire, and its coating is unstable and easy to fall off, which affects the cutting efficiency of the diamond wire. Therefore, most manufacturers directly purchase white tungsten wire at a high price as the mother wire of the diamond wire. The commonly used black tungsten wire washing is to remove the graphite layer on the surface of the tungsten wire through electrolytic polishing, but the electrolysis efficiency is low, and the C and O elements are difficult to remove, and the smoothness of the tungsten wire surface cannot be improved.
[0004] In view of this, it is necessary to propose a new technical solution to solve the above technical problems. Utility Model Content
[0005] The utility model aims to provide a black tungsten wire electrolytic whitening device to solve the problems of low electrolysis efficiency in the continuous production process of the prior art, difficulty in removing C and O elements, and inability to improve the smoothness of the tungsten wire surface.
[0006] In order to achieve the above purpose, the utility model adopts the following technical means:
[0007] A black tungsten wire electrolytic whitening device comprises at least two rows of alkali washing electrolytic cells arranged in sequence, a gap for black tungsten wire to pass through is left between the two rows of alkali washing electrolytic cells, one of the two adjacent alkali washing electrolytic cells in each row has an electrolytic electrode inserted, the alkali washing electrolytic cells in the first row with the electrolytic electrode inserted corresponds to the alkali washing electrolytic cells in the second row without the electrolytic electrode inserted, and different charges are input to the electrolytic electrode sheets in the two rows of alkali washing electrolytic cells, and a current loop is formed between adjacent alkali washing electrolytic cells through the conduction of the black tungsten wire.
[0008] As a further improvement, the first row of alkali-washing electrolytic cells with the electrolytic electrode sheets inserted therein and the corresponding second row of alkali-washing electrolytic cells without the electrolytic electrode sheets inserted therein are combined into an independent alkali-washing electrolytic cell.
[0009] As a further improvement, it also includes an alkali washing tank and a reflux tank. The alkali washing electrolytic tank is arranged in the alkali washing tank. The alkali washing tank and the reflux tank are connected by a conduit. A filtering device is provided on the conduit. The electrolytic solution in the alkali washing tank is filtered by the filtering device and then flows back into the reflux tank.
[0010] As a further improvement, a booster pump is provided between the reflux tank and the alkali washing tank, and the booster pump inputs the electrolyte in the reflux tank into the alkali washing tank.
[0011] As a further improvement, it also includes a water washing tank, in which the black tungsten wire passing through the alkaline washing electrolytic tank enters the water washing tank for cleaning, and at least one scrubbing module is provided in the water washing tank.
[0012] As a further improvement, the scrubbing module includes an upper cover plate and a lower cover plate, a lower scrubbing layer is provided below the upper cover plate, and an upper scrubbing layer is provided above the lower cover plate, and the black tungsten wire is cleaned by friction between the lower scrubbing layer and the upper scrubbing layer.
[0013] As a further improvement, a heat treatment device is also included. The black tungsten wire cleaned by the water washing tank enters the heat treatment device for heating to remove water droplets on the surface of the black tungsten wire and eliminate the internal stress of the tungsten wire.
[0014] Compared with the prior art, the utility model brings the following technical effects:
[0015] 1. The electrolytic electrodes are inserted alternately in the alkali-washing electrolytic cells to form a current loop between adjacent alkali-washing electrolytic cells. The direction of the current is consistent with the direction of the tungsten wire. By narrowing the gap in the middle of the alkali-washing electrolytic cells, the resistance between adjacent alkali-washing electrolytic cells is indirectly increased. The current can only be conducted through the tungsten wire between adjacent alkali-washing electrolytic cells, thereby increasing the efficiency of electrolysis;
[0016] 2. Compared with other black tungsten wire washing methods, electrolytic washing is simpler and faster. It can be directly electrolyzed in the alkaline washing tank without the need to modify the machines on the production line, which is more convenient and faster;
[0017] 3. A filtering device is added to the electrolytic reflux to remove graphite in the electrolytic solution, which is beneficial to the normal circulation of the solution. In subsequent production, the electrolytic whitening device of the utility model can be used to produce white tungsten wire, or the electrolytic whitening device of the utility model can be used to directly produce diamond wire by adding pre-plating, sanding, and thickening production processes after water washing. The alternating electrolytic whitening device used in the utility model can obtain white tungsten wire with a smooth surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 The schematic diagram of the installation structure of the electrolytic electrode in the black tungsten wire electrolytic whitening device is shown;
[0020] Figure 2 A schematic diagram showing the polarization phenomenon of black tungsten wire in a black tungsten wire electrolytic whitening device;
[0021] Figure 3 A cross-sectional view of an alkali washing electrolytic cell of a black tungsten wire electrolytic whitening device is shown;
[0022] Figure 4 The flow diagram of the electrolytic solution of the black tungsten wire electrolytic whitening device is shown;
[0023] Figure 5 A schematic diagram showing the use of a black tungsten wire electrolytic whitening device;
[0024] Figure 6 shows a schematic diagram of a scrubbing module;
[0025] Figure 7 A comparison of scanning electron microscope images of tungsten wires washed white by different electrolysis methods is shown.
[0026] Description of main component symbols:
[0027] 100-black tungsten wire electrolytic washing device; 1-alkaline washing electrolytic cell; 2-electrolytic electrode; 3-gap; 4-alkaline washing cell; 5-reflux cell; 6-conduit; 7-filtering device; 8-water washing cell; 8-reflux pipe; 9-scrubbing module; 91-upper cover plate; 92-lower cover plate; 93-lower scrubbing layer; 94-upper scrubbing layer; 10-heat treatment device; 200-black tungsten wire. DETAILED DESCRIPTION
[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0029] A black tungsten wire electrolytic whitening device comprises at least two rows of alkali washing electrolytic cells arranged in sequence, a gap for black tungsten wire to pass through is left between the two rows of alkali washing electrolytic cells, one of the two adjacent alkali washing electrolytic cells in each row has an electrolytic electrode inserted, the alkali washing electrolytic cells in the first row with the electrolytic electrode inserted corresponds to the alkali washing electrolytic cells in the second row without the electrolytic electrode inserted, and different charges are input to the electrolytic electrode sheets in the two rows of alkali washing electrolytic cells, and a current loop is formed between adjacent alkali washing electrolytic cells through the conduction of the black tungsten wire.
[0030] The electrolytic electrodes of the utility model are alternately inserted into the alkali washing electrolytic cells to form a current loop between adjacent alkali washing electrolytic cells. The direction of the current is consistent with the direction of the tungsten wire. By reducing the gap in the middle of the alkali washing electrolytic cells, the resistance between adjacent alkali washing electrolytic cells is indirectly increased. The current can only be conducted through the tungsten wire between adjacent alkali washing electrolytic cells, thereby increasing the efficiency of electrolysis.
[0031] Example
[0032] See also Figures 1 to 3 The utility model provides a black tungsten wire electrolytic cleaning device 100, which is used to clean a black tungsten wire 200. The black tungsten wire electrolytic cleaning device 100 comprises a plurality of sequentially arranged alkali washing electrolytic cells 1, each of which has an electrolytic electrode 2 inserted therein, and each of which is provided with a gap 3 for the black tungsten wire 200 to pass through, and the electrolytic electrode 2 in two adjacent alkali washing electrolytic cells 1 is alternately inserted along the two sides of the gap 3 in the direction of the black tungsten wire 200 passing through, and the electrolytic electrode 2 in the two adjacent alkali washing electrolytic cells 1 inputs different charges, and the black tungsten wire 200 conducts electricity so that a current loop is formed between the adjacent alkali washing electrolytic cells 1.
[0033] In another embodiment of the present embodiment, the black tungsten wire electrolytic whitening device 100 includes at least two rows of alkali washing electrolytic cells 1 arranged in sequence, and a gap 3 for the black tungsten wire 200 to pass through is left between the two rows of alkali washing electrolytic cells 1. One of the two adjacent alkali washing electrolytic cells 1 in each row has an alkali washing electrolytic cell inserted with an electrolytic electrode 2, and the alkali washing electrolytic cells 1 in the first row with the electrolytic electrode 2 inserted corresponds to the alkali washing electrolytic cells 1 in the second row without the electrolytic electrode 2 inserted, and the electrolytic electrode 2 in the two rows of alkali washing electrolytic cells 1 input different charges. It can be understood that two opposite alkali washing electrolytic cells 1 form a single electrolytic cell. In multi-line production, multiple alkali washing electrolytic cells 1 need to be arranged in parallel up and down, left and right.
[0034] Among them, see Figure 2 The principle of electrolytic polishing is the dissolution of the black tungsten wire 200 at the anode and the release of hydrogen at the cathode, wherein the black tungsten wire 200 is inserted into the electrolytic solution through the electrolytic electrode 2, and the entire alkaline washing electrolytic cell 1 is input with positive and negative charges through the electrolytic electrode 2. The black tungsten wire 200 is positively or negatively charged through the polarization phenomenon in different alkaline washing electrolytic cells 1.
[0035] When the black tungsten wire 200 is an anode, an oxidation reaction occurs, [OH]- in the alkaline electrolyte generates active oxygen ions, and the tungsten on the surface of the black tungsten wire 200 is oxidized to generate WO3, which reacts with [OH]- to generate WO42-. The reaction formula is as follows:
[0036] 2OH--2e-→H2O+[O]
[0037] W+3[O]→WO3
[0038] WO3+2OH-→WO42-+H2O
[0039] When the black tungsten wire 200 is the cathode, a reduction reaction occurs, and the water in the electrolytic solution near the black tungsten wire 200 obtains electrons to generate hydrogen. The reaction formula is as follows:
[0040] 2H2O+2e-→2OH-+2H2↑
[0041] The overall reaction formula is:
[0042] W+2H2O+2NaOH→Na2WO4+3H2↑
[0043] The electrolytic polishing of the black tungsten wire 200 is mainly performed by shuttling the black tungsten wire 200 in the alkaline washing electrolytic tank 1 with different positive and negative polarities, and the black tungsten wire 200 is polarized to the anode and the cathode alternately; the anode reduces the diameter of the black tungsten wire 200, and the cathode releases hydrogen to break through the graphite layer on the surface of the black tungsten wire 200.
[0044] Under the influence of the electrolytic electrode 2, the black tungsten wire 200 is positively charged as a whole through charge transfer, which is called the anode; while in the adjacent alkaline washing electrolytic cell 1, the black tungsten wire 200 is polarized to be negatively charged, which is called the cathode.
[0045] Preferably, the number of alkaline washing electrolytic cells 1 is preferably 10 to 30. During the electrolysis process, the electrolysis efficiency is controlled in a constant current manner, wherein the electrolytic solution is 40g / L to 80g / L NaOH (flake caustic soda), and the temperature is preferably 50°C to 60°C; the speed of washing and reducing the diameter of the black tungsten wire mouth is 20m / min to 65m / min.
[0046] More specifically, see Figure 4 The black tungsten wire electrolytic washing device 100 also includes an alkali washing tank 4 and a reflux tank 5. The alkali washing electrolytic tank 1 is arranged in the alkali washing tank 4. The alkali washing tank 4 and the reflux tank 5 are connected by a conduit 6. A filter device 7 is arranged on the conduit 6. The electrolytic solution in the alkali washing tank 4 is filtered by the filter device 7 and then flows back to the reflux tank 5. Preferably, the electrolytic solution flows out from the middle through the small holes in the single alkali washing electrolytic tank 1, and finally flows into the conduit 6 through the outlets on both sides of the alkali washing tank 4. The filter device 7 arranged at the outlet, middle or other position of the conduit 6 filters the graphite, and the filtered electrolytic solution flows back to the reflux tank 5 again. Preferably, the filter device 7 uses non-woven fabric to filter the graphite in the electrolytic solution, and the replacement cycle is 3-5 days. The non-woven fabric of the filter device 7 is replaced when the filter device 7 is rolled down. The filter device 7 is used to filter and remove the residual graphite in the electrolytic solution, which is beneficial to the circulation of the electrolytic solution.
[0047] Preferably, a booster pump (not shown) is provided between the reflux tank 5 and the alkali washing tank 4 . The booster pump may be an air pump, which can be selected by those skilled in the art according to actual needs. The booster pump inputs the electrolyte in the reflux tank 5 into the alkali washing tank 4 .
[0048] More specifically, see Figure 5 The black tungsten wire electrolytic whitening device 100 also includes a water washing tank 8. The black tungsten wire 200 that has passed through the alkaline washing electrolytic tank 1 enters the water washing tank 8 for cleaning. The water washing tank 8 is provided with at least one scrubbing module 9. After electrolytic polishing, the black tungsten wire 200 is wiped by the scrubbing module 9, thereby achieving the effect of whitening and reducing the diameter. Preferably, the water washing temperature in the water washing tank 8 is maintained at 50°C to 70°C.
[0049] More specifically, see Figure 6 The scrubbing module 9 includes an upper cover plate 91 and a lower cover plate 92 . A lower scrubbing layer 93 is provided below the upper cover plate 91 , and an upper scrubbing layer 94 is provided above the lower cover plate 92 . The black tungsten wire 200 is cleaned by friction between the lower scrubbing layer 93 and the upper scrubbing layer 94 .
[0050] More specifically, see Figure 5The black tungsten wire electrolytic whitening device 100 also includes a heat treatment device 10. The black tungsten wire 200 cleaned by the water washing tank 8 enters the heat treatment device 10 for heating, removes water droplets on the surface of the black tungsten wire and eliminates the internal stress of the tungsten wire. Preferably, the heat treatment device 10 is an oven, which maintains a constant temperature of 150±10°C, and is heated by multiple upper and lower heating rods to remove water droplets on the surface of the tungsten wire and eliminate the internal stress of the tungsten wire.
[0051] When implementing this utility model, please refer to Figure 5 In the production process, the steel wire is generally unwound by an unwinding wheel, electrolytically washed and whitened in an alkaline washing electrolytic tank 100, washed in a water washing tank 8, baked in a heat treatment device 10, and wound. Preferably, acid washing is performed between water washing in the water washing tank 8 and baking in the heat treatment device 10, and the second water washing tank 8 is used for water washing again; preferably, 10g / L to 20g / L of aminosulfonic acid is added during acid washing; and the pH is controlled between 0.5 and 2. Among them, a multi-wire unwinding device is used when unwinding the steel wire, which can unwind 1 to 30 wires, and the tension needs to be adjusted to 1N to 2.5N. The number of wire ends is determined by the production equipment.
[0052] Before winding, the black tungsten wire is observed by a mobile camera to see if it has been washed white. The mobile camera is installed on the guide rail to take pictures of each wire mouth, and the camera moves in a direction perpendicular to the wire mouth direction. It is understandable that the focus adjustment of the mobile camera belongs to the technicians in this field to operate on the control display screen according to actual needs, thereby controlling the shooting interval time and exposure parameters. Before winding, the white tungsten wire obtained after washing the black tungsten wire needs to be sampled for testing of physical parameters such as wire diameter, breaking force, and ellipticity.
[0053] The standards of white tungsten wire obtained after washing black tungsten wire are as follows:
[0054] 1. When black tungsten wire 200 is wiped with white paper, black matter will remain. The white tungsten wire obtained after washing black tungsten wire 200 does not have this characteristic.
[0055] 2. After electroplating, the electroplated tungsten wire products can be characterized by grinding the coating with sandpaper to characterize the coating bonding strength of black tungsten wire 200 and white tungsten wire. The coating bonding strength of black tungsten wire 200 is poor, and the coating falls off after grinding with sandpaper. The coating bonding strength of white tungsten wire is normal, and the coating does not fall off after grinding with sandpaper.
[0056] 3. The tungsten white wire obtained after washing the black tungsten wire 200 is subjected to energy spectrum analysis. In the results, if the proportion of C element is less than 10%, it is considered to be relatively clean, and if it is less than 5%, it is considered to be clean.
[0057] See also Figure 7 , Figure 7Scanning electron microscope images after alternating electrolysis and conventional electrolysis are shown. Compared with conventional electrolysis, the black tungsten wire electrolytic whitening device 100 of the utility model has a better whitening effect, and the surface of the white tungsten wire obtained by the utility model has a higher smoothness.
[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A black tungsten wire electrolytic washing device, Features: The invention comprises at least two rows of alkali washing electrolytic cells arranged in sequence, a gap for black tungsten wire to pass through is left between the two rows of alkali washing electrolytic cells, one of the two adjacent alkali washing electrolytic cells in each row has an electrolytic electrode inserted therein, the alkali washing electrolytic cells in the first row with the electrolytic electrode inserted therein corresponds to the alkali washing electrolytic cells in the second row without the electrolytic electrode inserted therein, and different charges are input to the electrolytic electrode sheets in the two rows of alkali washing electrolytic cells, and a current loop is formed between adjacent alkali washing electrolytic cells through conduction by the black tungsten wire.
2. The black tungsten wire electrolytic washing device according to claim 1, Features: The first row of alkali-washing electrolytic cells with the electrolytic electrode sheets inserted therein and the second row of alkali-washing electrolytic cells with no electrolytic electrode sheets inserted therein opposite thereto are combined into an independent alkali-washing electrolytic cell.
3. The black tungsten wire electrolytic whitening device according to claim 1, Features: It also includes an alkali washing tank and a reflux tank. The alkali washing electrolytic tank is arranged in the alkali washing tank. The alkali washing tank and the reflux tank are connected through a conduit. A filtering device is provided on the conduit. The electrolytic solution in the alkali washing tank is filtered by the filtering device and then flows back into the reflux tank.
4. The black tungsten wire electrolytic whitening device according to claim 3, Features: A booster pump is provided between the reflux tank and the alkali washing tank, and the booster pump inputs the electrolyte in the reflux tank into the alkali washing tank.
5. The black tungsten wire electrolytic whitening device according to claim 1, Features: It also includes a water washing tank, in which the black tungsten wire passing through the alkaline washing electrolytic tank enters the water washing tank for cleaning, and at least one scrubbing module is arranged in the water washing tank.
6. The black tungsten wire electrolytic whitening device according to claim 5, Features: The scrubbing module comprises an upper cover plate and a lower cover plate, a lower scrubbing layer is arranged below the upper cover plate, an upper scrubbing layer is arranged above the lower cover plate, and the black tungsten wire is rubbed and cleaned between the lower scrubbing layer and the upper scrubbing layer.
7. The black tungsten wire electrolytic whitening device according to claim 1, Features: Also included is a heat treatment device.