A method for electrochemical polishing of a metal mesh

Abstract

This invention relates to the field of metal surface treatment technology, specifically to a method for electropolishing metal mesh, comprising the following steps: Step 1, loading; Step 2, parameter initialization; Step 3, pre-polishing stage: the material sheet enters the first polishing station and is coarsely polished using a first polishing wheel at a first rotation speed and a first oscillation frequency; Step 4, fine polishing stage: the material sheet enters the second polishing station and is finely polished using a second polishing wheel at a second rotation speed and a second oscillation frequency, wherein the second rotation speed is higher than the first rotation speed and the second oscillation frequency is higher than the first oscillation frequency; Step 5, online detection; Step 6, feedback adjustment; Step 7, spray cooling; Step 8, unloading. This invention employs a two-stage process of pre-polishing + fine polishing, with clear division of labor. Coarse polishing quickly removes burrs, while fine polishing achieves precise rounding, resulting in a highly consistent smooth feel. Online detection and feedback adjustment form a closed-loop control, and multi-angle spray cooling ensures stable temperature in the polishing zone.

Description

Technical Field

[0001] This invention relates to the field of metal surface treatment technology, specifically to a method for electropolishing metal mesh, used for rounding the edges of wire drawing mesh and removing burrs, and is particularly suitable for precision polishing of automotive interior parts such as speaker grilles and ventilation mesh panels. Background Technology

[0002] Electropolishing (also known as mechanical electropolishing) is a process that uses a high-speed rotating polishing wheel to round off the edges of metal mesh panels. It is widely used in the automotive metal mesh panel processing industry. This process can effectively remove burrs and sharp edges generated during mesh processing without changing the original brushed texture of the material surface, resulting in a smooth product feel.

[0003] Current electropolishing processes typically use a polishing wheel with a fixed rotation speed, coupled with a belt conveyor to transport the workpiece, and supplemented by water spray cooling. However, this traditional method has the following technical problems: First, the polishing wheel speed, oscillation frequency, and feed speed are fixed, and cannot be adaptively adjusted according to changes in the material, thickness, and mesh shape of the mesh, resulting in poor consistency in polishing effects between different batches of products; Second, the polishing wheel will wear down during continuous use, causing the polishing force to gradually decrease, and the polishing effect of the same polishing wheel will differ significantly between the early and late stages of its life, resulting in defects such as "random patterns" or "poor feel" in the product; Third, the lack of real-time monitoring and feedback control of the polishing process makes it impossible to judge the polishing quality of the mesh edges online, easily leading to local over-polishing or under-polishing; Fourth, traditional water spraying only serves to cool down and remove dust, without precise control over water quality, flow rate, and spray angle, easily causing surface whitening or water stains; Fifth, the polishing wheel replacement cycle is fixed (e.g., 15 days), and is not dynamically adjusted according to the actual wear condition, resulting in waste of consumables or a decline in quality; Sixth, for complex mesh shapes (such as hexagonal, rhomboid, and irregular holes), the traditional method is difficult to guarantee uniform rounding of anisotropic edges. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for electropolishing metal mesh, which addresses the shortcomings of existing electropolishing processes such as fixed parameters, lack of feedback control, wear of polishing wheels affecting quality, and poor adaptability.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A method for electropolishing metal mesh, comprising the following steps: Step 1, feeding: Place the etched sheet to be processed at the feed end of the belt conveyor and ensure that the sheet is parallel to the conveying direction by the positioning device; Step 2, parameter initialization: Based on the material, thickness, mesh shape and wire drawing direction of the sheet, retrieve the initial polishing parameters from the process database. The initial polishing parameters include polishing wheel speed, oscillation frequency, oscillation amplitude, belt linear speed, spray flow rate and polishing pressure. Step 3, Pre-polishing stage: The sheet enters the first polishing station and is coarsely polished using the first polishing wheel at the first rotation speed and the first oscillation frequency to remove the main burrs and sharp edges of the mesh. Step 4, Fine Polishing Stage: The sheet enters the second polishing station and is finely polished using a second polishing wheel at a second rotation speed and a second oscillation frequency. The second rotation speed is higher than the first rotation speed, and the second oscillation frequency is higher than the first oscillation frequency, so that the edges of the mesh achieve a smooth feel. Step 5, Online Inspection: An optical inspection device is set up behind the fine polishing station to collect images of the edge of the mesh after polishing in real time, and the edge radius and burr residue are calculated by image processing algorithm; Step 6, Feedback Adjustment: Compare the online detection results with the preset standards. If the radius of the rounded corner is too small or the burr residue exceeds the standard, the polishing wheel speed will be automatically increased or the belt speed will be decreased. If the radius of the rounded corner is too large and the edge collapses, the polishing wheel speed will be automatically decreased or the belt speed will be increased. Step 7, Spray cooling: During the polishing process, a multi-angle spray head is used to spray coolant onto the polishing area. The coolant has a pH value of 7.0-8.5, a conductivity of ≤500μS / cm, and a temperature controlled at 15-25℃. Step 8, Unloading: After the polished material is dried by the air-drying device, it enters the receiving table.

[0006] The beneficial effects of this invention are as follows: Through a two-stage process of pre-polishing and fine polishing, the division of labor is clear. Coarse polishing quickly removes burrs, while fine polishing achieves precise rounding, resulting in a highly consistent smooth feel. Online detection and feedback adjustment form a closed-loop control system, correcting deviations in real time and reducing batch-to-batch quality fluctuations by more than 80%. Multi-angle spray cooling ensures stable temperature in the polishing zone.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the optical detection device in step five includes a high-resolution linear CCD camera and a coaxial light source. The image processing algorithm uses an edge detection operator to extract the mesh contour and uses the least squares method to fit the arc to calculate the rounded corner radius.

[0009] The beneficial effects of adopting the above-mentioned further scheme are: by using a high-resolution linear CCD and an edge detection algorithm, non-contact measurement of micron-level rounded corner radius can be achieved with a detection accuracy of ±0.01mm, providing a reliable basis for feedback adjustment.

[0010] Furthermore, the coolant in step seven contains a rust inhibitor and a surfactant, wherein the amount of rust inhibitor added is 0.1-0.5 wt% and the amount of surfactant added is 0.05-0.2 wt%.

[0011] The beneficial effects of adopting the above-mentioned further solutions are: the rust inhibitor prevents the material sheet from rusting after polishing, the surfactant reduces the surface tension of water, improves wettability, reduces water stains, and makes the surface of the material sheet cleaner.

[0012] Furthermore, in steps three and four, the first and second polishing wheels are made of non-woven fiber or nylon, and the abrasive particle size is P120-P600.

[0013] The advantages of adopting the above-mentioned further solutions are: the non-woven fiber wheels have good elasticity, are suitable for complex mesh shapes, and the particle size selection takes into account both efficiency and surface quality.

[0014] Furthermore, step eight also includes a polishing wheel dressing step: after processing a preset number of pieces, the dressing device is activated to dress the surface of the polishing wheel online.

[0015] The beneficial effects of adopting the above-mentioned further solutions are: regular dressing of the polishing wheel restores its cutting ability, extends its service life, maintains stable polishing quality, and avoids a decrease in polishing force due to clogging.

[0016] Furthermore, step six also includes anti-pattern control: the contact vibration frequency between the polishing wheel and the material is monitored by a vibration sensor, and the speed of the polishing wheel is automatically adjusted when the vibration frequency overlaps with the system's natural frequency.

[0017] The beneficial effects of adopting the above-mentioned further solutions are: resonance is avoided by vibration monitoring and speed adjustment, regular vibration patterns (random patterns) are prevented on the surface of the polishing wheel, and the surface aesthetics are improved.

[0018] Furthermore, in steps three and four, the oscillation frequency of the polishing wheel is 10-30Hz, the oscillation amplitude is 5-20mm, the polishing wheel speed is 1000-3000rpm, and the belt linear speed is 0.5-5m / min.

[0019] The beneficial effect of adopting the above-mentioned further solution is that it provides an optimal process parameter window, ensuring the effect of electropolishing.

[0020] Furthermore, a mid-polishing stage is provided between step three and step four: the material sheet that has passed the pre-polishing stage enters the mid-polishing station and is transitionally polished using a third polishing wheel.

[0021] The beneficial effects of adopting the above-mentioned further solution are: the addition of a mid-polishing station makes the transition smoother, reduces the residue of rough polishing marks, and is suitable for products with extremely high surface quality requirements.

[0022] Furthermore, step seven also includes a spray water circulation filtration step: the polished coolant is precipitated and filtered before being recycled, with a filtration accuracy of 10-50μm.

[0023] The beneficial effects of adopting the above-mentioned further solutions are: coolant recycling, reduced wastewater discharge, and filtration precision that can effectively remove metal debris generated during polishing and prevent secondary scratches.

[0024] Furthermore, this method is applicable to stainless steel sheets with a thickness of 0.5-2mm, a width of ≤650mm, and a length of ≥300mm that have undergone straight-drawn wire-textured etching.

[0025] The beneficial effect of adopting the above-mentioned further solution is that it clarifies the applicable sheet specifications, making it easier for operators to select the appropriate type. Attached Figure Description

[0026] Figure 1 This is a flowchart of the present invention; Detailed Implementation

[0027] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0028] like Figure 1 As shown, an embodiment of the present invention discloses a method for electropolishing a metal mesh, comprising the following steps: S01, Feeding: Place the etched sheet to be processed at the feed end of the belt conveyor and ensure that the sheet is parallel to the conveying direction by the positioning device; S02, Parameter initialization: Based on the material, thickness, mesh shape and wire drawing direction of the sheet, retrieve the initial polishing parameters from the process database. The initial polishing parameters include polishing wheel speed, oscillation frequency, oscillation amplitude, belt linear speed, spray flow rate and polishing pressure. S03, Pre-polishing stage: The sheet enters the first polishing station and is coarsely polished using the first polishing wheel at the first rotation speed and the first oscillation frequency to remove the main burrs and sharp edges of the mesh. S04, Fine polishing stage: The sheet enters the second polishing station and is finely polished using a second polishing wheel at a second rotation speed and a second oscillation frequency. The second rotation speed is higher than the first rotation speed, and the second oscillation frequency is higher than the first oscillation frequency, so that the mesh edge achieves a smooth feel. S05, Online Inspection: An optical inspection device is set up behind the fine polishing station to collect images of the mesh edge after polishing in real time, and calculate the edge radius and burr residue through image processing algorithm; S06, Feedback Adjustment: The online detection results are compared with the preset standards. If the radius of the rounded corner is too small or the burr residue exceeds the standard, the polishing wheel speed is automatically increased or the belt speed is decreased. If the radius of the rounded corner is too large and the edge collapses, the polishing wheel speed is automatically decreased or the belt speed is increased. S07, Spray cooling: During the polishing process, a multi-angle spray head is used to spray coolant onto the polishing area. The coolant has a pH value of 7.0-8.5, a conductivity of ≤500μS / cm, and a temperature controlled at 15-25℃. S08, Unloading: After the polished sheet is dried by the blowing device to remove surface moisture, it enters the receiving table.

[0029] The optical detection device in step S05 includes a high-resolution linear CCD camera and a coaxial light source. The image processing algorithm uses an edge detection operator to extract the mesh contour and calculates the rounded corner radius by fitting the arc using the least squares method. By employing a high-resolution linear CCD and an edge detection algorithm, non-contact measurement of the rounded corner radius at the micrometer level is achieved, with a detection accuracy of ±0.01mm, providing a reliable basis for feedback adjustment.

[0030] In step S07, the coolant contains a rust inhibitor and a surfactant. The rust inhibitor is added at a concentration of 0.1-0.5 wt%, and the surfactant is added at a concentration of 0.05-0.2 wt%. The rust inhibitor prevents the material from rusting after polishing, while the surfactant reduces the surface tension of water, improves wettability, reduces water residue, and makes the surface of the material cleaner.

[0031] In steps S03 and S04, the first and second polishing wheels are made of non-woven fiber or nylon, and the abrasive grit size is P120-P600. Non-woven fiber wheels have good elasticity and are suitable for complex mesh shapes; the grit size selection balances efficiency and surface quality.

[0032] Following step S08, a polishing wheel dressing step is also included: after processing a preset number of sheets, the dressing device is activated to perform online dressing of the polishing wheel surface. Regularly dressing the polishing wheel restores its cutting ability, extends its service life, maintains stable polishing quality, and avoids a decrease in polishing force due to clogging.

[0033] Step S06 also includes anti-random texture control: the contact vibration frequency between the polishing wheel and the material sheet is monitored by a vibration sensor, and the polishing wheel speed is automatically adjusted when the vibration frequency overlaps with the system's natural frequency. Vibration monitoring and speed adjustment avoid resonance, preventing the polishing wheel from generating regular vibration patterns (random textures) on the material sheet surface, thus improving the surface aesthetics.

[0034] In steps S03 and S04, the polishing wheel oscillation frequency is 10-30Hz, the oscillation amplitude is 5-20mm, the polishing wheel rotation speed is 1000-3000rpm, and the belt linear speed is 0.5-5m / min. Optimal process parameter windows are provided to ensure the effectiveness of electropolishing.

[0035] Between steps S03 and S04, there is an intermediate polishing stage: the sheet material after the pre-polishing stage enters the intermediate polishing station, where a third polishing wheel is used for transition polishing. Adding the intermediate polishing station makes the transition smoother, reduces residual rough polishing marks, and is suitable for products with extremely high surface quality requirements.

[0036] Step S07 further includes a spray water circulation filtration step: the polishing coolant is precipitated, filtered, and then recycled, with a filtration accuracy of 10-50 μm. Coolant recycling reduces wastewater discharge, and the filtration accuracy effectively removes metal debris generated during polishing, preventing secondary scratches.

[0037] In embodiments of the present invention, a polishing wheel wear compensation step is also included: the load current of the polishing wheel drive motor is monitored in real time by a current sensor. When the load current drops below a set threshold, polishing wheel wear is determined, and the controller automatically increases the pressure between the polishing wheel and the workpiece or increases the rotation speed to maintain a constant polishing removal rate. By monitoring the motor load current, the wear state of the polishing wheel is indirectly determined, and the pressure or rotation speed is automatically compensated, so that the polishing wheel outputs a constant polishing force throughout its entire life cycle, extending the polishing wheel replacement cycle by 30% and avoiding product quality degradation due to wear.

[0038] In an embodiment of the present invention, the polishing wheel has a segmented structure, divided into multiple independently controllable segments along the axial direction. Each segment can independently adjust its rotation speed and oscillation amplitude for differentiated polishing of sheets of different widths. To address the varying polishing requirements of different areas (such as edges and centers) of wide sheets, the parameters of each segment are independently adjusted to ensure uniform rounded corners at the edges of the mesh across the entire sheet, eliminating the common phenomenon of "good in the middle, poor at the edges."

[0039] This method is applicable to stainless steel sheets with a thickness of 0.5-2mm, a width ≤650mm, and a length ≥300mm that have undergone straight-drawn wire-textured etching. The applicable sheet specifications are clearly defined, facilitating selection by operators.

[0040] The following specific embodiment of the present invention and corresponding comparative experiments illustrate the beneficial effects of the technical solution of this application: I. Equipment Configuration A three-station polishing system is used: the first station (rough polishing) uses P240 non-woven fiber wheels, the second station (intermediate polishing) uses P400 nylon wheels, and the third station (fine polishing) uses P600 non-woven fiber wheels. Each polishing wheel is 650mm wide and divided into five independently controllable sections (130mm each) along the axial direction. The belt conveyor is driven by a servo motor with closed-loop speed control. The online detection device uses an 8K linear CCD camera (8192 pixels resolution, 40kHz line frequency) with a coaxial LED light source. The controller is a PLC + industrial computer.

[0041] II. Experimental Design The following comparative experiment was conducted using an etched sheet of X-series low-end door panel speaker grille (304 stainless steel, 0.8mm thick, 550mm wide, 500mm long, hexagonal mesh with 3mm distance between opposite sides) as the test workpiece.

[0042] Example 1 (Preferred embodiment of the present invention) Parameter settings: Rough polishing station speed 1500 rpm, oscillation frequency 15 Hz, oscillation amplitude 12 mm; Medium polishing station speed 2000 rpm, oscillation frequency 20 Hz, oscillation amplitude 10 mm; Fine polishing station speed 2500 rpm, oscillation frequency 25 Hz, oscillation amplitude 8 mm; Belt linear speed 2 m / min; Coolant is deionized water (pH 7.2, conductivity 50 μS / cm), with 0.2 wt% rust inhibitor (triethanolamine) and 0.1 wt% surfactant (alkyl glycoside), spray flow rate 8 L / min, temperature 20℃. Online detection and feedback adjustment are enabled (target fillet radius 0.10 ± 0.02 mm, burr residue ≤ 0.01 mm). Wear compensation is enabled (load current drop threshold 10%). Online dressing is enabled (dressing every 50 pieces). Continuous processing of 200 pieces.

[0043] Example 2 (No Feedback Adjustment) Except for disabling online detection and feedback adjustment, the process is the same as in Example 1. Continuous processing of 200 pieces.

[0044] Example 3 (without wear compensation) Except for disabling wear compensation (i.e., not monitoring current or adjusting pressure / speed), the process is the same as in Example 1. 200 pieces are processed continuously.

[0045] Example 4 (Single-stage polishing) Only the fine polishing station is used (parameters are the same as those in Example 1), and everything else is the same as in Example 1. 50 pieces are processed.

[0046] Comparative Example 1 (Traditional Fixed Parameter Method) Traditional electropolishing process is used: a single polishing wheel (P320 non-woven fabric wheel), fixed rotation speed of 1800 rpm, fixed oscillation frequency of 18 Hz, fixed belt speed of 1.5 m / min, water spray without additives, and no feedback control. 200 pieces are processed continuously, and data from the first 50 and the last 50 pieces are recorded.

[0047] Comparative Example 2 (without spray additives) The coolant was pure deionized water (without rust inhibitors or surfactants), and everything else was the same as in Example 1. 50 pieces were processed.

[0048] III. Test Results For each experimental batch, samples were randomly selected for testing (1 piece out of every 10 pieces). The testing indicators included: mesh edge radius (average of 5 different locations), burr residue height, surface irregularity rate, surface whitening / water stain rate, and batch-to-batch radius variation. The results are shown in the table below: Data shows that Example 1 performed best across all indicators, exhibiting uniform rounded corners, no burrs, no irregular patterns, and no water stains. Example 2 (no feedback) showed a significantly increased range of rounded corner variations and poor consistency. Example 3 (no wear compensation) saw a continuous decrease in rounded corner radius during the later stages of processing, resulting in under-polishing. Example 4 (single-stage polishing) lacked coarse polishing, resulting in a smaller rounded corner radius. Comparative Example 1 (traditional process) showed acceptable quality for the first 50 pieces, but the quality of the latter 50 pieces dropped significantly due to severe wear of the polishing wheel, with high rates of whitening and water stains. Comparative Example 2 (no additives) showed a whitening / water stain rate as high as 25%.

[0049] IV. Comparison of Different Process Parameters Using the formula from Example 1, we examined the effect of changing parameters on the results (while keeping other parameters constant): Taking both efficiency and quality into consideration, Group B is the preferred option.

[0050] V. Verification of Wear Compensation Effect Run Example 1 (with compensation) and Example 3 (without compensation) respectively, and record the fillet radius at different processing stages of the same polishing wheel from new to scrap: In Example 1, the fillet radius stabilized between 0.10-0.11 mm under the compensation mechanism, and the polishing wheel life was extended to 850 pieces; in Example 3, the fillet radius continued to decrease, and it was no longer acceptable after 500 pieces.

[0051] VI. Verification of the effect of segmented polishing wheels Wide sheets (650mm wide) were processed using both a single polishing wheel and a five-segment independently controlled polishing wheel. The fillet radii at different locations along the width of the sheet were inspected. Segmented independent control improves the uniformity of fillet radius in the width direction by 85%.

[0052] VII. Anti-pattern control effect Without anti-random pattern control, when the polishing wheel speed is 2100 rpm (close to the system resonant frequency), obvious regular vibration patterns (random patterns) appear, with a random pattern occurrence rate of 18%. After enabling vibration monitoring and automatic speed adjustment, the controller automatically adjusts the speed to 2180 rpm (avoiding resonance), and the random pattern occurrence rate drops to 0.3%.

[0053] VIII. Overall Application Effect The method of this invention was applied to the mass production of the X-series / W04 high-end door panel speaker grille. After three months of continuous operation, the statistical results were as follows: average corner radius: 0.108mm (target 0.10-0.12mm); intra-batch variation of corner radius: ≤0.02mm; pass rate for hand feel: 99.8% (no scratch feel when scratched with fingertips); scrap rate due to irregular patterns: 0.2%; average lifespan of polishing wheels: 820 pieces (350 pieces in the traditional process); coolant replacement cycle: 30 days (circulating filtration, only replenishing losses); and the processing cost per piece was reduced by 40% compared to the traditional process.

[0054] In the description of this invention, it should be understood that the terms "center," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "inner," "outer," "circumferential," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for electropolishing metal mesh, characterized in that, Includes the following steps: Step 1, feeding: Place the etched sheet to be processed at the feed end of the belt conveyor and ensure that the sheet is parallel to the conveying direction by the positioning device; Step 2, parameter initialization: Based on the material, thickness, mesh shape and wire drawing direction of the sheet, retrieve the initial polishing parameters from the process database. The initial polishing parameters include polishing wheel speed, oscillation frequency, oscillation amplitude, belt linear speed, spray flow rate and polishing pressure. Step 3, Pre-polishing stage: The sheet enters the first polishing station and is coarsely polished using the first polishing wheel at the first rotation speed and the first oscillation frequency to remove the main burrs and sharp edges of the mesh. Step 4, Fine Polishing Stage: The material sheet enters the second polishing station and is finely polished using a second polishing wheel at a second rotation speed and a second oscillation frequency. The second rotation speed is higher than the first rotation speed, and the second oscillation frequency is higher than the first oscillation frequency. Step 5, Online Inspection: An optical inspection device is set up behind the fine polishing station to collect images of the edge of the mesh after polishing in real time, and the edge radius and burr residue are calculated by image processing algorithm; Step 6, Feedback Adjustment: Compare the online detection results with the preset standards. If the radius of the rounded corner is too small or the burr residue exceeds the standard, the polishing wheel speed will be automatically increased or the belt speed will be decreased. If the radius of the rounded corner is too large and the edge collapses, the polishing wheel speed will be automatically decreased or the belt speed will be increased. Step 7, Spray cooling: During the polishing process, a multi-angle spray head is used to spray coolant onto the polishing area. The coolant has a pH value of 7.0-8.5, a conductivity of ≤500μS / cm, and a temperature controlled at 15-25℃. Step 8, Unloading: After the polished material is dried by the air-drying device, it enters the receiving table.

2. The method for electropolishing metal mesh according to claim 1, characterized in that, The optical detection device in step five includes a high-resolution linear CCD camera and a coaxial light source. The image processing algorithm uses an edge detection operator to extract the mesh outline and uses the least squares method to fit the arc to calculate the rounded corner radius.

3. The method for electropolishing metal mesh according to claim 1, characterized in that, The coolant in step seven contains a rust inhibitor and a surfactant. The amount of the rust inhibitor added is 0.1-0.5 wt%, and the amount of the surfactant added is 0.05-0.2 wt%.

4. The method for electropolishing metal mesh according to claim 1, characterized in that, In steps three and four, the first and second polishing wheels are made of non-woven fiber or nylon, and the abrasive particle size is P120-P600.

5. The method for electropolishing metal mesh according to claim 1, characterized in that, Step eight also includes a polishing wheel dressing step: after processing a preset number of pieces, the dressing device is activated to dress the surface of the polishing wheel online.

6. A method for electropolishing metal mesh according to any one of claims 1 to 5, characterized in that, Step six also includes anti-pattern control: the contact vibration frequency between the polishing wheel and the material is monitored by a vibration sensor, and the speed of the polishing wheel is automatically adjusted when the vibration frequency overlaps with the system's natural frequency.

7. A method for electropolishing metal mesh according to any one of claims 1 to 5, characterized in that, In steps three and four, the oscillation frequency of the polishing wheel is 10-30Hz, the oscillation amplitude is 5-20mm, the polishing wheel speed is 1000-3000rpm, and the belt linear speed is 0.5-5m / min.

8. A method for electropolishing metal mesh according to any one of claims 1 to 5, characterized in that, Between step three and step four, there is also a mid-polishing stage: the material sheet that has passed the pre-polishing stage enters the mid-polishing station and is transitionally polished using a third polishing wheel.

9. A method for electropolishing metal mesh according to any one of claims 1 to 5, characterized in that, Step seven also includes a spray water circulation filtration step: the polished coolant is precipitated and filtered before being recycled, with a filtration accuracy of 10-50μm.

10. A method for electropolishing metal mesh according to any one of claims 1 to 5, characterized in that, This method is applicable to stainless steel sheets with a thickness of 0.5-2mm, a width of ≤650mm, and a length of ≥300mm that have been etched with a straight brush pattern.

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