Device and method for electroplating chromium on cylindrical part

Abstract

The invention provides a device and a method for electroplating chromium on a cylindrical part, one end of a hook in the device is connected with a cathode conductive hoop, and the arc size of the cathode conductive hoop is matched with the size of a workpiece; the positioning block is connected with the hook and used for fixing the upper end of a workpiece, the size of the positioning block is matched with the inner diameter of the workpiece, and the cathode conductive hoop and the positioning block jointly fix the workpiece and enable the workpiece to be kept perpendicular; the positioning ring sleeves the upper end of the workpiece, and the arc size is matched with the outer diameter of the workpiece; one end of the connecting rod is fixed on the positioning ring, the other end is connected with the anode ring, and the height position of the anode ring is matched with a workpiece plating part; one end of the conductive wire is connected with the pull rod, and the other end of the conductive wire is connected with the conductive clamp; and the hook is connected with a cathode of an external tank body. According to the invention, the uniform thickness of the coating of the workpiece can be ensured, the electroplating time is shortened, and the grinding operation is cancelled.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of chromium plating surface treatment, and particularly relates to a device and method for electroplating chromium on a cylindrical part. BACKGROUND

[0002] Electroplating is a process of electrochemically depositing a thin layer of metal, alloy or metal and non-metal powder on a solid surface to form a composite electrodeposition layer. During electroplating, the plated workpiece is connected to the negative pole of a direct current power source as a cathode, and the positive pole is connected to the positive pole of the power source. Chromium layer has high hardness and good wear resistance. Due to the excellent performance of the chromium plating layer, it is widely used as an outer layer of a protective-decorative plating layer system and a functional plating layer, such as an aircraft landing gear system.

[0003] However, the dispersion and coverage ability of the chromium plating solution is poor, and complex-shaped parts need to use an iconic anode, a protective cathode and an auxiliary anode to obtain a uniform thickness of the plating layer. Moreover, the plating layer has poor roughness, and the size of the plating layer needs to be increased, and then polished to meet the roughness and uniform plating layer. During electroplating of a cylindrical workpiece, in order to obtain a uniform plating layer, the thickness of the plating layer is increased during electroplating, and then polished, which results in long electroplating time and large polishing workload. Therefore, a suitable device is needed for electroplating to obtain a uniform plating layer, which can be polished in the later stage, thereby shortening the electroplating time, canceling the polishing, and achieving the effect of energy saving and emission reduction. SUMMARY

[0004] The technical problem to be solved by the application is that, during electroplating of a cylindrical workpiece, in order to obtain a uniform plating layer, the thickness of the plating layer is increased during electroplating, and then polished, which results in long electroplating time and large polishing workload.

[0005] The technical scheme of the application is: A device and method for electroplating chromium on a cylindrical part are provided, In a first aspect, a device for electroplating chromium on a cylindrical part is provided, which comprises a positioning ring 1, an anode ring 2, a pull rod 3, a cathode conductive clamp 4, a hook 5, a positioning block 8, a conductive wire 9, a conductive clamp 11, and a connecting rod 12. The hook 5 is connected with the cathode conductive clamp 4 at one end, and the arc size of the cathode conductive clamp 4 is matched with the size of the workpiece; the cathode conductive clamp 4 is used for supporting the workpiece, fixing the lower end of the workpiece and conducting electricity; the positioning block 8 is connected with the hook 5 and is used for fixing the upper end of the workpiece; the size of the positioning block 8 is matched with the inner diameter of the workpiece; the cathode conductive clamp 4 and the positioning block 8 jointly fix the workpiece and make the workpiece keep vertical; the positioning ring 1 is sleeved on the upper end of the workpiece, and the arc size of the positioning ring 1 is matched with the outer diameter of the workpiece and is used for supporting the connecting rod 12; one end of the connecting rod 12 is fixed on the positioning ring 1, and the other end of the connecting rod 12 is connected with the anode ring 2; the height position of the anode ring 2 is matched with the plating part of the workpiece; one end of the conductive wire 9 is connected with the pull rod 3, and the other end of the conductive wire 9 is connected with the conductive clamp 11; the conductive clamp 11 is clamped on the anode of the external groove; the hook 5 is connected with the cathode of the external groove; the entering plating liquid part of the hook 5 is protected by the insulating protective tape to avoid the tool from dispersing the current.

[0006] Optionally, the anode ring 2 is provided in plurality, the number of the anode ring 2 is consistent with the number of the plating part of the workpiece, and the plurality of anode rings 2 are connected in series through the pull rod 3, and the pull rod 3 is connected with the anode ring 2.

[0007] Optionally, the device further comprises the fixing ring 10 sleeved in the middle of the pull rod 3 to prevent the position of the plurality of anode rings 2 from shaking and to ensure that the anode rings 2 are coaxial.

[0008] Optionally, the hook 5 is made of copper alloy to enhance the conductive performance; and the cathode conductive clamp 4 is made of copper alloy.

[0009] Optionally, the conductive wire 9 and the conductive clamp 11 are made of copper material; and the anode ring 2, the pull rod 3 and the connecting rod 12 are made of titanium alloy.

[0010] Optionally, the surface of the anode ring 2 is plated with a layer of platinum to ensure that the anode ring 2 is more corrosion-resistant and the conductive performance is enhanced.

[0011] Optionally, the size of the anode ring 2 is greater than the size of the plating part of the workpiece, and the size is specifically required to be simulated and calculated, and the anode ring 2 is ensured not to be easily deformed and to be perpendicular to the workpiece, thereby ensuring that the size of the plating part is uniform.

[0012] Optionally, the surface of the anode ring 2 is in a grid shape to facilitate the flow of plating liquid.

[0013] Optionally, the positioning ring 1, the positioning block 8 and the fixing ring 10 are made of insulating material.

[0014] In a second aspect, a method for electroplating chromium on a cylindrical part is provided, In use, firstly, the two hooks 5 are connected and fixed with the cathode conductive clamp 4 through the bolts 6 and the nuts 7. The positioning block 8 is connected on the hook 5 through the bolts 6 and the nuts 7. The positioning ring 1 is locked and fixed on one end of the workpiece through the bolts 6 and the nuts 7. One end of the connecting rod 12 is fixed on the positioning ring 1, and the other end is connected with the uppermost anode ring 2. The rest of the anode rings 2 are connected in series through the pull rods 3. When more than two anode rings 2 are used, the fixing ring 10 is further used to be connected on the pull rod 3, so as to ensure the coaxiality of all the anode rings 2. One end of the conductive wire 9 is connected with the pull rod 3, and the other end is connected with the conductive clamp 11 which is clamped on the anode of the power supply.

[0015] When the workpiece is hung, the workpiece is firstly passed through the anode ring 2 from the lower end to the positioning block 8, and the cathode conductive clamp 4 is locked on the other end of the workpiece, so that the verticality of the workpiece is maintained. The workpiece plating area is located at the corresponding position of the anode ring 2, and the number of the anode rings 2 used is determined according to the plating area. The length of the hook 5, the arc size of the cathode conductive clamp 4, the diameter size of the anode ring 2 and the like are determined according to the size of the workpiece. Meanwhile, the pull rod 3, the hook 5 and the like which are immersed in the solution are protected by using the insulating tape, so as to prevent the dispersion of the current. After the workpiece is hung, it is placed in the process tank for plating, and there is no need to additionally increase the lead anode as in the traditional chromium plating. The use of the tooling ensures the uniformity of the workpiece plating thickness, effectively shortens the plating time, reduces the grinding allowance after the traditional plating, and greatly improves the production efficiency.

[0016] The beneficial effects of the present application are as follows: The chromium plating device can be used for the plating of cylindrical or other regular-shaped workpieces. The device is convenient and reliable to use, and the tooling can be repeatedly used, and each part can be disassembled and replaced. The device optimizes the chromium plating size of the cylindrical workpiece, ensures the uniformity of the thickness, reduces the plating time, cancels the grinding after the chromium plating, and improves the efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of a cylindrical workpiece; Figure 2 It is a schematic view of the device for the chromium plating of the cylindrical part of the present application; Figure 3 It is a front view of the device for the chromium plating of the cylindrical part of the present application; Figure 4 It is a schematic view of an anode ring; Figure 5 It is a schematic view of a positioning ring.

[0018] Among them, 1-positioning ring, 2-anode ring, 3-pull rod, 4-cathode conductive clamp, 5-hook, 6-bolt, 7-nut, 8-positioning block, 9-conductive wire, 10-fixing ring, conductive clamp 11, connecting rod 12. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0020] The features and illustrative embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. The following description of embodiments is merely exemplary in nature and is provided to give a better description of the application. The present application is not limited to any particular setting or method as set forth below, but covers any modifications, equivalents, and alternatives falling within the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessary obscurity of the present application.

[0021] It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict, and each embodiment can be mutually referred to and quoted.

[0022] The present application will be described in detail below with reference to the drawings and specific embodiments.

[0023] Referring to Figure 2 and Figure 3 , the embodiments of the present application provide a device for sizing chrome plating of cylindrical parts, which comprises a positioning ring 1, an anode ring 2, a pull rod 3, a cathode conductive clamp 4, a hook 5, a bolt 6, a nut 7, a positioning block 8, a conductive wire 9, a fixing ring 10, a conductive clamp 11, and a connecting rod 12.

[0024] One end of the tool hook 5 is connected with the cathode conductive clamp 4 through the bolt 6 and the nut 7, and the arc size of the cathode conductive clamp 4 is adapted to the size of the workpiece. The positioning block 8 is connected with the hook 5 through the bolt 6 and the nut 7, and the size of the protruding part of the positioning block 8 is adapted to the workpiece, referring to Figure 5Positioning ring 1 locks the workpiece through bolt 6 and nut 7, and the middle hole diameter is matched with the workpiece. One end of connecting rod 12 is fixed on positioning ring 1, and the other end is connected to anode ring 2. Both ends of pull rod 3 are connected to anode ring 2 through nut 7. One end of conductive wire 9 is connected to pull rod 3, and the other end is connected to conductive clamp 11. Fixed ring 10 is fixed on pull rod 3. Cathode conductive clamp 4, hook 5, conductive wire 9 and conductive clamp 11 are made of copper material, and anode ring 2, pull rod 3, bolt 6, nut 7 and connecting rod 12 are made of titanium alloy. Positioning ring 1, positioning block 8 and fixed ring 10 are made of insulating material, such as polytetrafluoroethylene.

[0025] Hook 5 is connected to the cathode of the external groove body and is made of copper alloy, which can enhance the conductivity, but the part entering the plating solution must be protected by insulating protective tape to avoid the dispersion of current by the tool.

[0026] Cathode conductive clamp 4 is made of copper alloy and is fixedly connected to hook 5 through bolt 6 and nut 7. Cathode conductive clamp 4 is mainly used for supporting the workpiece, fixing the lower end of the workpiece and conducting electricity. The arc size of cathode conductive clamp 4 is matched with the workpiece to ensure fastening.

[0027] Positioning block 8 is made of insulating material to prevent the direct interconnection of the cathode and anode. It is connected to hook 5 through bolt 6 and nut 7. Positioning block 8 fixes the upper end of the workpiece, and its size is matched with the inner diameter of the workpiece. Cathode conductive clamp 4 and positioning block 8 jointly fix the workpiece and keep it vertical.

[0028] Positioning ring 1 is made of insulating material to prevent the direct interconnection of the cathode and anode. Positioning ring 1 is sleeved on the upper end of the workpiece and is locked through bolt 6 and nut 7. Its arc size is matched with the outer diameter of the workpiece. Positioning ring 1 is mainly used for supporting connecting rod 12.

[0029] Connecting rod 12 is made of titanium alloy to ensure its corrosion resistance to chromic acid solution and support strength. One end of connecting rod 12 is connected to positioning ring 1, and the other end is connected to anode ring 2.

[0030] Anode ring 2 is made of titanium alloy to ensure its corrosion resistance to chromic acid solution. Its surface can be plated with a layer of platinum to ensure its more corrosion resistance and enhanced conductivity. The height position of anode ring 2 is matched with the plating part of the workpiece. The size of anode ring 2 is slightly larger than the size of the plating part of the workpiece, which needs to be simulated and calculated, and it is ensured that it is not easy to deform and is perpendicular to the workpiece, thereby ensuring the uniformity of the size of the plating part. The surface of anode ring 2 is in a grid shape, which is beneficial to the circulation of the plating solution, see Figure 4. The number of anode rings 2 is consistent with the plating area of ​​the workpiece, and can be increased or decreased according to the condition of the workpiece. The anode rings 2 are connected in series through the pull rod 3. In order to allow the current to fully act on the plating area of ​​the workpiece, reduce the plating time, and prevent it from shielding the plating area, the pull rod 3 and the connecting rod 12 must be insulated and protected. Because the anode ring 2 mainly acts as an anode rod, during the plating process, the lead anode used in traditional plating is not allowed to be used in the external tank body to prevent affecting the current distribution.

[0031] The fixing ring 10 is supported by an insulating material and is sleeved in the middle of the pull rod 3 to prevent the anode ring 2 from shaking and ensure that the anode ring 2 is coaxial up and down.

[0032] One end of the conductive wire 9 is connected to the pull rod 3, and the other end is connected to the conductive clip 11, which is mainly used to connect to the anode of the external tank body.

[0033] The conductive clip 11 is clamped on the anode of the outer tank.

[0034] An embodiment of the present invention provides a device for electroplating chromium on cylindrical parts, which may include two hooks 5, two cathode conductive clamps 4, several bolts 6, nuts 7, a fixing ring 10, a positioning ring 1, two connecting rods 12, two pull rods 3, two anode rings 2, two conductive wires 9, and two conductive clips 11.

[0035] by Figure 1 Taking the cylindrical workpiece shown as an example, before use, first connect and fix the two hooks 5 to the cathode conductive clamp 4 with bolts 6 and nuts 7. The positioning block 8 is connected to the hook 5 with bolts 6 and nuts 7. The positioning ring 1 is fixed to the workpiece. One end of the connecting rod 12 is fixed to the positioning ring 1, and the other end is connected to the top anode ring 2. The remaining anode rings 2 are connected in series through the pull rod 3. The fixing ring 10 is strung on the pull rod 3 to ensure the coaxiality of the anode ring 2. One end of the conductive wire 9 is connected to the pull rod 3, and the other end is connected to the conductive clamp 11. The conductive clamp 11 is clamped on the anode of the power supply.

[0036] When in use, first connect and fix the two hooks 5 to the cathode conductive clamp 4 through bolts 6 and nuts 7. The positioning block 8 is connected to the hook 5 through bolts 6 and nuts 7. The positioning ring 1 is locked and fixed to one end of the workpiece by bolts 6 and nuts 7. One end of the connecting rod 12 is fixed to the positioning ring 1, and the other end is connected to the top anode ring 2, and the remaining anode rings 2 are connected in series through the pull rod 3. When more than two anode rings 2 are used, a fixing ring 10 must be further used to string on the pull rod 3 to ensure the coaxiality of all anode rings 2. One end of the conductive wire 9 is connected to the pull rod 3, and the other end is connected to the conductive clamp 11, and the conductive clamp 11 is clamped on the anode of the power supply.

[0037] When the workpiece is hung, the workpiece is first passed through the anode ring 2 from below until the positioning block 8, the cathode conductive clamp 4 locks the other end of the workpiece, and the verticality of the workpiece is maintained; the electroplating area of the workpiece is at the corresponding position of the anode ring 2, and the number of anode rings 2 used is determined according to the electroplating area. The length of the hook 5, the arc size of the cathode conductive clamp 4, the diameter size of the anode ring 2, etc. are determined according to the size of the workpiece. At the same time, the insulating tape is used to protect the part of the pull rod 3, the hook 5, etc. immersed in the solution to prevent the dispersion of the current. After the workpiece is hung, it is placed in the process tank for electroplating, without the need to additionally increase the lead anode as in the traditional chromium electroplating. The use of the tooling ensures that the workpiece plating layer thickness is uniform, effectively shortens the electroplating time, reduces the grinding allowance after traditional electroplating, and greatly improves the production efficiency.

[0038] The use of the device of the embodiment of the present application ensures that the workpiece plating layer thickness is uniform, the electroplating time is reduced, and grinding is cancelled.

[0039] The above only expresses the embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. In addition, the non-exhaustive parts of the present application are all conventional technologies.

Claims

1. A device for electroplating chromium on cylindrical parts, characterized in that: include: Positioning ring (1), anode ring (2), pull rod (3), cathode conductive clamp (4), hook (5), positioning block (8), conductive wire (9), conductive clip (11), connecting rod (12), One end of the hook (5) is connected to the cathode conductive clamp (4), and the arc size of the cathode conductive clamp (4) is adapted to the size of the workpiece; the cathode conductive clamp (4) is used to support the workpiece, fix the lower end of the workpiece and conduct electricity; the positioning block (8) is connected to the hook (5) and is used to fix the upper end of the workpiece, and the size of the positioning block (8) is adapted to the inner diameter of the workpiece. The cathode conductive clamp (4) and the positioning block (8) jointly fix the workpiece and keep the workpiece vertical; the positioning ring (1) is sleeved on the upper end of the workpiece, and its arc size is adapted to the outer diameter of the workpiece, and is used to support the connecting rod (12); one end of the connecting rod (12) is fixed on the positioning ring (1), and the other end is connected to the anode ring (2), and the height position of the anode ring (2) is adapted to the plating part of the workpiece; one end of the conductive wire (9) is connected to the pull rod (3), and the other end is connected to the conductive clamp (11), and the conductive clamp (11) is clamped on the anode of the external tank body; the hook (5) is connected to the cathode of the external tank body, and the area where the pull rod (3) and the hook (5) enter the plating solution is protected by insulating protective tape.

2. The device according to claim 1, wherein There are multiple anode rings (2), the number of which is consistent with the number of plated parts of the workpiece, and the multiple anode rings (2) are connected in series via a pull rod (3).

3. The device according to claim 2, wherein The device also includes a fixing ring (10) sleeved in the middle of the pull rod (3) to prevent the positions of the multiple anode rings (2) from shaking.

4. The device according to claim 1, wherein The hook (5) is made of copper alloy, and the cathode conductive clamp (4) is made of copper alloy.

5. The device according to claim 1, wherein The conductive wire (9) and the conductive clip (11) are made of copper material, and the anode ring (2), the pull rod (3), and the connecting rod (12) are made of titanium alloy.

6. The device according to claim 1, wherein The surface of the anode ring (2) is plated with a platinum layer.

7. The device according to claim 1, wherein The size of the anode ring (2) is larger than the size of the plated portion of the workpiece.

8. The device according to claim 1, wherein The surface of the anode ring (2) is in a grid shape.

9. The device according to claim 1, wherein The positioning ring (1), the positioning block (8), and the fixing ring (10) are made of insulating material.

10. A method for electroplating chromium on cylindrical parts, characterized in that: The method is used for the device according to any one of claims 1 to 9, and the method comprises: When in use, first connect and fix the two hooks (5) to the cathode conductive clamp (4), connect the positioning block (8) to the hook (5), lock and fix the positioning ring (1) to one end of the workpiece, fix one end of the connecting rod (12) to the positioning ring (1), and connect the other end to the top anode ring (2), and connect the remaining anode rings (2) in series through the pull rod (3); when more than two anode rings (2) are used, string the fixing ring (10) on the pull rod (3) to ensure the coaxiality of all anode rings (2), connect one end of the conductive wire (9) to the pull rod (3), and connect the other end to the conductive clamp (11), and clamp the conductive clamp (11) on the anode of the power supply; When hanging a workpiece, first pass the workpiece from the bottom through the anode ring (2) to the positioning block (8), and lock the other end of the workpiece with the cathode conductive clamp (4) to keep the workpiece vertical; the electroplating area of ​​the workpiece is at the corresponding position of the anode ring (2), and the area where the pull rod (3) and the hook (5) are immersed in the solution is protected with insulating tape. After the workpiece is hung, it is placed in the process tank for electroplating.

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