A plating cathode hanger for large flat plate structure workpieces and a method for manufacturing the same

Abstract

The present application relates to a kind of electroplating cathode hanger for large flat structure workpiece and its preparation method, electroplating cathode hanger for large flat structure workpiece includes main conductive plate, upper part has the structure of connecting electroplating groove cathode conductive component, lower part is the strip-shaped conductive structure for facilitating current uniform distribution;Auxiliary conductive component is the array type auxiliary cylinder of composite structure, can be tensioned workpiece;Edge conductive component can be connected workpiece edge;Connecting pad is used to connect edge conductive component with main conductive plate and cooperate workpiece tensioning;Fixed cover plate is used to fix workpiece.Its preparation method covers the specific processing and assembly steps of each component, and insulating treatment is carried out on non-conductive contact area.Compared with prior art, the present application aims to solve the problem of poor uniformity of large workpiece electroplating caused by insufficient conductive performance, unreasonable structure design and other problems of existing hanger.

Description

Technical Field

[0001] This invention relates to an electroplating cathode fixture, and more particularly to an electroplating cathode fixture for large flat workpieces and its preparation method. Background Technology

[0002] With the rapid development of industrial technology, the application of large flat plate workpieces is becoming increasingly widespread. These workpieces are mainly used in aerospace, automotive manufacturing, electronic equipment, and decorative engineering, where the quality of surface electroplating is crucial to functionality, durability, and appearance. However, traditional electroplating cathode racks typically employ an edge-conductive design. Due to the large size of large flat workpieces, the current distribution becomes uneven due to resistance effects as it travels from the edge conductive area to the center. The current density is higher at the edges, resulting in a significantly thicker electroplated layer, while the current density is lower at the center, leading to a thinner layer or even missing plating. This phenomenon not only weakens the mechanical properties and corrosion resistance of the workpiece but also seriously affects the overall electroplating quality. Furthermore, the imbalance in the electric field distribution during electroplating further exacerbates the unevenness of the plating thickness. Simultaneously, for thin plates or mesh-like low-strength workpieces, a lack of proper tensioning and fixing measures during electroplating can easily lead to workpiece deformation or poor contact, resulting in a "virtual connection" phenomenon, which in turn affects the uniformity and effectiveness of electroplating.

[0003] Currently, the demand for electroplating large flat workpieces is increasing, with common workpieces including aluminum alloy sheets, titanium alloy sheets, conductive glass substrates, and stainless steel sheets. These workpieces are large in size, thin in structure, and diverse in materials, making the electroplating process complex and placing more stringent requirements on the mounting fixtures. However, existing mounting fixtures have shortcomings in material selection, structural design, and conductivity, failing to fully meet the needs of industrial production. Traditional mounting fixtures mostly use pure copper, which, despite its good conductivity, is easily damaged in highly corrosive electroplating environments, resulting in a limited service life. Their structural design primarily uses straight conductive copper strips, which cannot effectively address the conductivity requirements of the middle section of large workpieces, particularly in terms of thin plate tension and deformation prevention. Furthermore, while some complex multi-point conductive mounting fixtures improve current distribution, their cumbersome design and high cost make them difficult to apply on a large scale in industry.

[0004] Faced with the above problems, the industry urgently needs a new type of fixture that is reasonably designed, low in manufacturing cost, and easy to operate, in order to solve the problem of uneven electroplating of large flat workpieces. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology by providing an electroplating cathode fixture for large flat workpieces and its preparation method. This invention aims to solve the problem of poor electroplating uniformity in large workpieces caused by insufficient conductivity and unreasonable structural design of existing fixtures. Through reasonable material selection and innovative structural design, the fixture of this invention significantly improves the uniformity of current distribution during the electroplating process, especially in the central area of ​​the workpiece, effectively increasing the current density and thus improving the uniformity of the plating thickness.

[0006] The conceptualization process of this invention includes the following: an ideal mounting fixture should provide uniform current distribution while ensuring overall mechanical strength, significantly improving electroplating uniformity, especially in the center of the workpiece. Simultaneously, the fixture needs good corrosion resistance to withstand environments with prolonged contact with the electroplating solution. Furthermore, the fixture structure should be lightweight and easy to operate, facilitating workpiece installation and removal, thereby improving production efficiency. For workpieces of different sizes and shapes, the fixture also needs high versatility and adjustability to adapt to diverse production needs. Therefore, developing a fixture design that can significantly improve electroplating uniformity and adapt to large flat workpieces is not only of great significance for improving industrial production efficiency and product quality, but also provides key support for innovation in electroplating technology for large workpieces.

[0007] The objective of this invention can be achieved through the following technical solutions: The first aspect of this invention provides an electroplating cathode fixture for large flat workpieces, comprising a main conductive plate, auxiliary conductive components, edge conductive components, a connecting pad, and a fixing cover plate, wherein specifically: The main conductive plate has a connection structure at the top for suspending the cathode conductive component in the electroplating tank, and a conductive structure at the bottom for connecting with the auxiliary conductive component. The conductive structure has a strip-shaped distribution feature on the plane to facilitate uniform current distribution. The auxiliary conductive component is made of an inner conductive material and an outer corrosion-resistant material. The auxiliary conductive component is connected to the conductive structure of the main conductive plate and has a variation feature in the height direction. The variation feature is used to tension and prevent deformation of large flat plate workpieces. The edge conductive component is connected to the main conductive plate and is used for connection with the edge of a large flat plate structure workpiece; The connecting pad, made of conductive material, is used to connect the edge conductive component to the main conductive plate and to give the edge conductive component a preset height relationship with the auxiliary conductive component to accommodate the tension of large flat plate workpieces. The fixing cover has a shape adapted to the edge conductive component and is connected to the edge conductive component. The fixing cover is used to fix the workpiece.

[0008] Furthermore, the electroplating cathode hanger also includes a reinforcing component, which is connected to the upper connecting structure of the main conductive plate to enhance its structural strength.

[0009] Furthermore, the main conductive plate is manufactured using an integral molding process, which may be a laser cutting process or a precision casting process, to ensure the structural integrity and conductivity uniformity of the main conductive plate.

[0010] Furthermore, the conductive structure of the main conductive plate is a horizontally and vertically intersecting strip structure with an intersection angle ranging from 30 degrees to 90 degrees. The width of the strip structure is 3 to 15 mm, and the thickness is 2 to 8 mm, in order to enhance the uniformity of current conduction and the structural strength of the main conductive plate itself.

[0011] Furthermore, in the auxiliary conductive component, the inner conductive material is copper or a copper alloy, the outer corrosion-resistant material is stainless steel or a corrosion-resistant alloy, and the thickness of the outer corrosion-resistant material ranges from 0.3 to 1.5 mm.

[0012] Furthermore, the auxiliary conductive components are auxiliary cylinders arranged in an array on the conductive structure of the main conductive plate. The array is arranged in a rectangular array or a ring array, and the spacing between adjacent auxiliary cylinders is 10-50 mm. The outer corrosion-resistant material at one end of the auxiliary cylinder is removed, and the inner conductive material is processed into an external thread segment. The external thread segment is connected to the threaded hole on the main conductive plate, thereby reducing contact resistance and improving conductivity.

[0013] Furthermore, the auxiliary conductive component exhibits the following variation characteristics in the height direction: it gradually decreases from the center to the surrounding areas, forming an arc-shaped trend. The radius of curvature of the arc is adjusted according to the thickness and material of the workpiece to adapt to different types of large flat plate structure workpieces. Based on the arc-shaped trend of the auxiliary cylinder gradually decreasing from the center to the surrounding areas, it plays a supporting and tensioning role for the workpiece.

[0014] Furthermore, the edge conductive component is made of conductive stainless steel, specifically 304, 316, or 316L stainless steel. The edge conductive component is annular or has a shape that matches the edge contour of a large flat workpiece to ensure good edge conductivity and versatility. The conductive material of the connecting pad is copper or copper alloy, with a thickness ranging from 5 to 20 mm. The connecting pad is connected to the edge conductive components and the main conductive plate by thread or welding.

[0015] Furthermore, the fixed cover plate is connected to the edge conductive component by bolts or snaps; The main conductive plate is made of copper, and the connection structure of the cathode conductive component in the main conductive plate for suspending in the electroplating tank consists of two parallel hooks.

[0016] A second aspect of the present invention provides a method for preparing an electroplating cathode hanger as described above, comprising the following steps: Main conductive plate preparation: Using copper sheet, it is processed into an integral structure using laser cutting or precision casting. For the upper part, two parallel hooks for hanging are cut out and bent. For the lower part, horizontal and vertical intersecting strip conductive structures are cut out, with the intersection angle controlled between 30 and 90 degrees. The width of the strip structure is 3 to 15 mm and the thickness is 2 to 8 mm. Threaded holes are machined on the intersecting strip structure. Auxiliary conductive component preparation: Select a composite tube with an inner layer of copper or copper alloy and an outer layer of stainless steel or corrosion-resistant alloy with an outer layer thickness of 0.3 to 1.5 mm. Process it into an auxiliary cylindrical shape, remove the outer corrosion-resistant material from one end of the cylinder, process the inner conductive material into an external thread segment, and arrange them on the conductive structure under the main conductive plate in a rectangular or ring array. The spacing between adjacent auxiliary cylinders is controlled at 10-50 mm. They are connected to the threaded holes on the main conductive plate through the external thread segment. During installation, adjust the height of the auxiliary cylinder so that it gradually decreases from the middle to the periphery to form an arc shape. The radius of curvature of the arc is adjusted according to the thickness and material of the workpiece. Preparation of edge conductive components: Using 304 stainless steel, 316 stainless steel or 316L stainless steel, it is processed into a ring shape or a shape that matches the edge contour of the workpiece, and screw holes are machined on it. Connection pad preparation: A pad with a thickness of 5-20 mm is made of copper or copper alloy material and connected between the main conductive plate and the edge conductive component by thread connection or welding. The height of the edge conductive component relative to the auxiliary conductive component is adjusted so that it is 1-3 mm lower than the auxiliary conductive component. Preparation of fixing cover plate: Prepare a fixing cover plate that matches the shape of the edge conductive component, and connect it to the edge conductive component by bolt connection or snap connection to fix the workpiece; Insulation protection treatment: Except for the hook part, the surface of the auxiliary cylinder top that contacts the workpiece, and the surface of the edge conductive plate that contacts the workpiece, the other parts of the hanger are wrapped with insulating glue. The insulating glue is made of acid and alkali resistant, high temperature resistant rubber, plastic or ceramic coating material.

[0017] Compared with the prior art, the present invention has the following beneficial effects: First, the combination design of the main conductive plate and the auxiliary cylinder significantly optimizes the distribution of current on the workpiece surface, especially increasing the current density in the central area of ​​the workpiece. This solves the problem of uneven plating thickness caused by edge conductivity in traditional hangers, thereby significantly improving the uniformity of electroplating and the quality of the plating layer.

[0018] Secondly, this invention uses copper, stainless steel and their composite materials as the main materials, which not only ensures excellent electrical conductivity, but also gives the rack excellent corrosion resistance, enabling it to be used stably in electroplating solutions for a long time and extending the service life of the rack.

[0019] In addition, the fixture has a reasonable structural design. The arc height distribution of the auxiliary cylinder enables the tensioning and fixing of thin plates or mesh workpieces, preventing the workpieces from having poor contact or deformation during the electroplating process. The design of the annular edge conductive plate not only supplements the current distribution at the edge of the workpiece, but also allows for flexible adjustment according to the shape and size of the workpiece, improving the adaptability and versatility of the fixture.

[0020] Meanwhile, the invention adopts laser cutting integrated molding and threaded connection design, which simplifies the installation and disassembly of the hanger and significantly improves the efficiency of industrial operation.

[0021] In summary, this invention combines high conductivity, superior corrosion resistance, wide applicability, and convenient operation, providing an efficient, reliable, and low-cost technical solution for electroplating large flat workpieces. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the hanger in this invention; Figure 2 This is a schematic diagram of the main conductive plate in this invention; Figure 3 This is a schematic diagram of the edge conductive plate. Figure 4 This is a schematic diagram of the cover plate structure; Figure 5 A schematic diagram of the auxiliary cylinder; Figure 6 A schematic diagram showing the connection structure between the edge conductive plate and the auxiliary cylinder and the main conductive plate; Figure 7 A schematic diagram of the height distribution structure of the auxiliary cylinder; Figure 8 This is a schematic diagram of the height matrix distribution of the auxiliary cylinder. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0024] Example 1 This embodiment provides a cathode fixture design specifically for the electroplating process of large flat workpieces, aiming to solve the problem of poor electroplating uniformity of large workpieces caused by insufficient conductivity and unreasonable structural design of existing fixtures. Through reasonable material selection and innovative structural design, the fixture of this invention significantly improves the uniformity of current distribution during the electroplating process, especially in the central area of ​​the workpiece, effectively increasing the current density and thus improving the uniformity of the plating thickness.

[0025] The mounting structure in this embodiment includes: a main conductive plate, reinforcing strips, auxiliary cylinders, edge conductive plates, pads and cover plates, and insulating adhesive. These components work together to form a complete mounting system that is highly conductive, corrosion-resistant, easy to install, and adaptable to various workpieces.

[0026] (1) Main conductive plate: The main conductive plate is made of copper, which ensures good conductivity of the hanger; The main conductive plate is made of a single piece of copper plate, laser-cut without bolts. The cutting process ensures the good conductivity and mechanical strength of the hanger. The thickness of the main conductive plate can be 3-10mm, depending on the actual current required.

[0027] The upper half of the main conductive plate is cut off in the middle, leaving two parallel copper strips, each 30-100mm wide, along the edge. The tops of these two copper strips are bent using a bending machine to form hooks, which are used to suspend the cathode copper busbars on the electroplating tank, conducting electricity to the entire fixture. The cathode copper busbars of the electroplating tank are directly connected to the rectifier. The length of the two copper strips is adjusted according to the electroplating tank conditions, ensuring that the workpiece is completely submerged in the electroplating solution and positioned at the center of the tank depth. The length of the two copper strips is generally 500mm-1000mm.

[0028] The lower half of the main conductive plate features a crisscrossing copper strip structure to connect the auxiliary cylinders and further enhance conductivity. These copper strips are relatively thin, typically 5-10mm, to minimize interference with the electric field between the anode and cathode. Uniformly spaced threaded holes, typically M3-M5, are present on these strips to connect the auxiliary cylinders; threaded holes offer better conductivity compared to through holes. This crisscrossing design not only increases the main conductive plate's resistance to deformation during laser cutting but also improves the uniformity of current distribution.

[0029] Figure 2The main conductive plate includes: hook 2-1 for connecting the cathode copper busbar of the electroplating tank, conductive copper strip 2-2, screw hole 2-3 for connecting with the reinforcing strip, copper strip 2-4 for connecting with the auxiliary cylinder, threaded hole 2-5 on the copper strip connected with the auxiliary cylinder, and threaded hole 2-6 for connecting with the pad.

[0030] (2) Reinforcing strip A reinforcing strip made of 304 stainless steel is connected between the two copper strips above the main conductive plate. 304 stainless steel has high strength and low cost and is used to improve the strength between the two copper strips.

[0031] (3) Auxiliary cylinder The auxiliary cylinder is CNC-cut from stainless steel with copper plating. The inner part of this cylinder is copper, typically 2-4mm in diameter; the outer part is stainless steel, usually 0.5-1mm thick.

[0032] By using CNC machining technology, the stainless steel layer at the bottom of the cylinder is removed, and the copper is machined into external threads to precisely connect with the threaded holes of the main conductive plate, thereby reducing contact resistance and improving conductivity. The outer stainless steel layer can ensure good corrosion resistance, and the thinner stainless steel layer will not increase the resistance significantly. Figure 5 This is a schematic diagram of the auxiliary cylinder.

[0033] The auxiliary cylinder is designed to gradually decrease in height from the center outwards, forming an arc shape. This design is used to tension workpieces, especially suitable for thin sheets or mesh workpieces, and can effectively prevent loose connections caused by relaxation deformation during electroplating.

[0034] (4) Edge conductive plate Edge conductive plates are used to connect with the edges of workpieces, providing additional conductive paths for the edge portion while preventing excessive conductivity in the edge area from affecting the overall current distribution; Its material is 316L stainless steel, which has both a certain degree of electrical conductivity and excellent corrosion resistance. The edge conductive plate is designed as a ring, with its inner diameter matching the outer diameter of the workpiece, which can accommodate flat workpieces of different sizes. The annular edge conductive plate also has some screw holes for connecting to the pad and cover plate.

[0035] Figure 6 The diagram shows the connection between the edge conductive plate and the auxiliary cylinder to the main conductive plate. It includes: edge conductive plate 1-3, pad 6-2, which is used to connect the main conductive plate and the edge conductive plate and raise the edge conductive plate to a certain height, and auxiliary cylinder 5.

[0036] (5) Pad and cover plate The pad, made of copper, connects the edge conductive plate to the main conductive plate and raises its height to match the auxiliary cylinder, but still slightly lower (1-3mm) to achieve arc-shaped tension on the workpiece. The cover plate, ring-shaped and matching the edge conductive plate, secures the workpiece, edge conductive plate, and pad together with screws, ensuring a stable installation of the entire fixture. See the schematic diagram of the cover plate. Figure 4 .

[0037] (6) Insulating adhesive To prevent the hanger itself from being plated during the electroplating process, except for the hook part, the surface of the auxiliary cylinder top that contacts the workpiece, and the surface of the edge conductive plate that contacts the workpiece, which retain exposed metal, the rest of the hanger is completely wrapped with a layer of insulating glue to ensure the long-term stability of the hanger in a highly corrosive electroplating environment.

[0038] To meet the requirements for uniform current distribution and high conductivity in the electrodeposition process of nickel mesh electrodes in alkaline electrolytic hydrogen production, a fixture suitable for nickel mesh electrode electrodeposition was fabricated using the fixture of this invention, and its superior performance was verified.

[0039] In the specific preparation process: First, a 5mm thick, 1100mm long, and 450mm wide copper plate is selected and laser-cut into the design shape of the main conductive plate. The upper half of the main conductive plate is machined into two parallel copper strips, each 650mm long and 60mm wide, used to connect to the cathode copper busbar of the electroplating tank and conduct current. The lower half is designed as a 450mm long and 450mm wide structure with intersecting copper strips inside to ensure uniform current distribution in the middle of the workpiece. M4 threaded holes are evenly drilled on these intersecting copper strips with a hole spacing of 28mm to fix the auxiliary cylinder and further conduct current.

[0040] Next, copper backing plates are cut to enhance the connection between the edge conductive plate and the main conductive plate. The backing plates are 10mm thick, 30mm long, and 30mm wide, ensuring that the height of the edge conductive plate matches the arc distribution of the auxiliary cylinders. Subsequently, the edge conductive plate, made of 316L stainless steel, is laser-cut in the shape of... Figure 3 As shown, the dimensions are an inner diameter of 370mm and an outer diameter of 450mm. The screw hole positions of the edge conductive plate are consistent with those of the main conductive plate and the pad, used for bolt connection and fixation. Matching this, a cover plate made of 304 stainless steel, with the same shape and size as the edge conductive plate, is laser-cut to cover and fix the nickel mesh electrode.

[0041] The auxiliary cylinder is made of a stainless steel-clad copper composite material, machined by CNC turning. The threaded portion of the cylinder is made of copper, 20mm in length, precisely fitting the screw holes on the main conductive plate; the copper cylinder body is 20mm long, covered with a 1mm thick stainless steel layer to ensure excellent conductivity and corrosion resistance. Figure 8 The height matrix shown indicates that stainless steel copper-clad studs are installed at the screw hole positions on the intersecting copper strips of the main conductive board. For achieving the curved height distribution, see [reference needed]. Figure 7 and 8 The height difference is adjusted by adding a copper shim with an inner diameter of M4 and an outer diameter of 6mm to the bottom of the stud, ensuring that the nickel mesh is taut and avoiding loosening and poor connection during the electrodeposition process. Figure 7 To assist in the height distribution of the cylinder, 7-1 in the figure represents the workpiece, and 5 represents the auxiliary cylinder. The height of the auxiliary cylinder gradually increases from the edge to the center, forming an arc shape. Figure 8 The height matrix of the auxiliary cylinder (relative to the edge conductive plate, in mm).

[0042] Finally, according to Figure 1 The overall installation method shown involves fixing the main conductive plate hook to the cathode copper busbar of the electroplating tank, placing the nickel mesh electrode flat on the auxiliary cylinder and edge conductive plate, and securing it with a cover plate and bolts. The fixture design ensures a uniform current distribution for the nickel mesh electrode during electrodeposition, while also being robust and easy to operate. Figure 1 This is the fixture of the present invention. The figure includes a main conductive plate 1-1, a reinforcing strip 1-2, an edge conductive plate 1-3, a cover plate 1-4, a workpiece 1-5, and an auxiliary cylinder 5.

[0043] Experimental results show that the mounting fixture exhibits superior performance in the electrodeposition process of nickel mesh electrodes for alkaline electrolytic hydrogen production. The nickel mesh surface has a uniform plating thickness, and the difference in current density between the center and edge regions is significantly reduced, meeting the quality requirements of industrial production. Furthermore, the fixture demonstrates good corrosion resistance and reusability, providing a reliable guarantee for large-scale applications.

[0044] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A cathode mounting fixture for electroplating large flat workpieces, characterized in that, include: The main conductive plate has a connection structure at the top for suspending the cathode conductive component in the electroplating tank, and a conductive structure at the bottom for connecting with the auxiliary conductive component. The conductive structure has a strip distribution feature on the plane to facilitate uniform current distribution. The conductive structure of the main conductive plate is a horizontal and vertical intersecting strip structure with an intersection angle ranging from 30 degrees to 90 degrees. The width of the strip structure is 3 to 15 mm and the thickness is 2 to 8 mm to enhance the uniformity of current conduction and the structural strength of the main conductive plate itself. The auxiliary conductive component is composed of an inner conductive material and an outer corrosion-resistant material. It is connected to the conductive structure of the main conductive plate and exhibits a varying height. This varying height is used to tension and prevent deformation of large flat workpieces. The auxiliary conductive component is an array of auxiliary cylinders arranged on the conductive structure of the main conductive plate. The outer corrosion-resistant material is removed from one end of each auxiliary cylinder, and the inner conductive material is machined into an external thread segment. This external thread segment connects to a threaded hole on the main conductive plate. The varying height of the auxiliary conductive component is characterized by a gradual decrease in height from the center outwards, forming an arc shape. An edge conductive component, connected to the main conductive plate, is used for connection with the edge of a large flat plate structure workpiece; The connecting pad, made of conductive material, is used to connect the edge conductive component to the main conductive plate and to ensure that the edge conductive component has a preset height relationship with the auxiliary conductive component to accommodate the tension of large flat plate workpieces. The connecting pad is connected to the edge conductive component and the main conductive plate by thread or welding. The height of the edge conductive component relative to the auxiliary conductive component is adjusted so that it is 1 to 3 mm lower than the auxiliary conductive component. A fixed cover plate having a shape adapted to an edge conductive component and connected to the edge conductive component, the fixed cover plate being used to fix the workpiece.

2. The electroplating cathode hanger for large flat workpieces according to claim 1, characterized in that, The electroplating cathode hanger also includes a reinforcing component, which is connected to the upper connecting structure of the main conductive plate to enhance its structural strength.

3. The electroplating cathode fixture for large flat workpieces according to claim 1, characterized in that, The main conductive plate is manufactured using an integral molding process, which can be either laser cutting or precision casting, to ensure the structural integrity and uniform conductivity of the main conductive plate.

4. The electroplating cathode fixture for large flat workpieces according to claim 1, characterized in that, In the auxiliary conductive component, the inner conductive material is copper or a copper alloy, the outer corrosion-resistant material is a corrosion-resistant alloy, and the thickness of the outer corrosion-resistant material ranges from 0.3 to 1.5 mm.

5. The electroplating cathode hanger for large flat workpieces according to claim 1, characterized in that, In the auxiliary conductive components, the array is arranged in a rectangular array or a ring array, and the spacing between adjacent auxiliary cylinders is 10-50 mm.

6. The electroplating cathode fixture for large flat workpieces according to claim 5, characterized in that, In the auxiliary conductive component, the radius of curvature of the arc is adjusted according to the thickness and material of the workpiece to adapt to different types of large flat plate structure workpieces. Based on the arc trend of the auxiliary cylinder gradually decreasing from the middle to the surrounding area, it plays a supporting and tensioning role for the workpiece.

7. The electroplating cathode hanger for large flat workpieces according to claim 1, characterized in that, The edge conductive component is made of conductive stainless steel, specifically 304, 316, or 316L stainless steel. The edge conductive component is ring-shaped or has a shape that matches the edge contour of a large flat workpiece to ensure good edge conductivity and versatility. The conductive material of the connecting pad is copper or a copper alloy, and its thickness ranges from 5 to 20 millimeters.

8. The electroplating cathode hanger for large flat workpieces according to claim 1, characterized in that, The fixed cover plate is connected to the edge conductive component by bolts or clips; The main conductive plate is made of copper, and the connection structure of the cathode conductive component in the main conductive plate for suspending in the electroplating tank consists of two parallel hooks.

9. A method for preparing an electroplating cathode hanger as described in any one of claims 1 to 8, characterized in that, Includes the following steps: Main conductive plate preparation: Using copper sheet, it is processed into an integral structure using laser cutting or precision casting. For the upper part, two parallel hooks for hanging are cut out and bent. For the lower part, horizontal and vertical intersecting strip conductive structures are cut out, with the intersection angle controlled between 30 and 90 degrees. The width of the strip structure is 3 to 15 mm and the thickness is 2 to 8 mm. Threaded holes are machined on the intersecting strip structure. Auxiliary conductive component preparation: Select a composite tube with an inner layer of copper or copper alloy and an outer layer of corrosion-resistant alloy with an outer layer thickness of 0.3 to 1.5 mm. Process it into an auxiliary cylindrical shape, remove the outer corrosion-resistant material at one end of the cylinder, process the inner conductive material into an external thread segment, and arrange them on the conductive structure under the main conductive plate in a rectangular or ring array. The spacing between adjacent auxiliary cylinders is controlled at 10-50 mm. They are connected to the threaded holes on the main conductive plate through the external thread segment. During installation, adjust the height of the auxiliary cylinder so that it gradually decreases from the middle to the periphery to form an arc shape. The radius of curvature of the arc is adjusted according to the thickness and material of the workpiece. Preparation of edge conductive components: Using 304 stainless steel, 316 stainless steel or 316L stainless steel, it is processed into a ring or a shape that matches the edge contour of the workpiece, and screw holes are machined on it. Connection pad preparation: A pad with a thickness of 5 to 20 mm is prepared using copper or copper alloy material. It is connected between the main conductive plate and the edge conductive component by thread connection or welding. The height of the edge conductive component relative to the auxiliary conductive component is adjusted so that it is 1 to 3 mm lower than the auxiliary conductive component. Preparation of fixing cover plate: Prepare a fixing cover plate that matches the shape of the edge conductive component, and connect it to the edge conductive component by bolt connection or snap connection to fix the workpiece; Insulation protection treatment: Except for the hook part, the surface of the auxiliary cylinder top that contacts the workpiece, and the surface of the edge conductive plate that contacts the workpiece, the other parts of the hanger are wrapped with insulating glue. The insulating glue is made of acid and alkali resistant, high temperature resistant rubber, plastic or ceramic coating material.

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