Tool for electroplating chromium in deep hole of piston

Abstract

The utility model provides a tool for piston deep hole chromium electroplating, and the tool comprises a connecting rod which is arranged at the bottom of a workpiece and is used for supporting the workpiece; one end of the hook assembly is connected with the connecting rod, and the other end of the hook assembly is connected with a cathode of the process tank; the branch pipe assembly is provided with a connecting column, the connecting column is connected with an anode of the process tank, one end of the branch pipe assembly can penetrate into the workpiece, and the other end of the branch pipe assembly is connected with a gas source; the chromium electroplating tool can be used for hanging and electroplating of workpieces with inner cavities, hanging is convenient and reliable, the tool can be repeatedly used, and all parts can be detached and replaced.

Description

Technical Field

[0001] This application belongs to the field of surface treatment technology, and in particular relates to a tooling for electroplating chromium in deep holes of pistons. Background Technology

[0002] Electroplating is a process that uses electrochemical methods to electrodeposit a thin layer of metal, alloy, or a composite electrodeposited layer of metal and non-metal powder onto a solid surface. During electroplating, the workpiece to be plated acts as the cathode, connected to the negative terminal of a DC power supply, while the anode is connected to the positive terminal.

[0003] Chromium plating has high hardness, good wear resistance, strong reflectivity, and good heat resistance. Due to its excellent properties, chromium plating is widely used as the outer layer of protective-decorative plating systems and as a functional plating layer, such as on aircraft landing gear cylinders. However, the dispersion and coverage of chromium plating solutions are poor, making it difficult to plate chromium in deep holes of parts. For parts with complex shapes, it is necessary to use shaped anodes, protective cathodes, and auxiliary anodes to obtain a plating layer of uniform thickness.

[0004] Piston parts have relatively large bore diameters and are blind holes. During electroplating, the plating solution does not flow easily and is prone to air compression. When using conventional mounting methods for electroplating, it is difficult to form a chromium layer in the inner hole. Auxiliary tooling is required for mounting to obtain a satisfactory chromium layer. Utility Model Content

[0005] Purpose of this application: The tooling hanger provided in this application can solve problems such as uneven coating thickness or inability to deposit coating caused by compressed air in the inner cavity of chromium-plated workpieces.

[0006] This application provides a fixture for deep hole chromium plating of pistons, the fixture comprising:

[0007] A connecting rod is disposed at the bottom of the workpiece, and the connecting rod is used to support the workpiece;

[0008] A hook assembly, one end of which is connected to the connecting rod, and the other end of which is connected to the cathode of the process tank;

[0009] A branch pipe assembly has a connecting post that is connected to the anode of a process tank. One end of the branch pipe assembly can penetrate into the workpiece, and the other end of the branch pipe assembly is connected to a gas source.

[0010] Preferably, the bottom of the workpiece has threads, one end of the connecting rod is provided with a threaded hole, and the other end of the connecting rod is provided with a through hole; one end of the connecting rod is connected to the bottom of the workpiece by threads.

[0011] Preferably, the hook assembly includes:

[0012] A hook is connected to the cathode of the process tank;

[0013] A vertical rod, one end of which is connected to the hook;

[0014] The L-shaped component is connected to the other end of the connecting rod by bolts and nuts; wherein, the other end of the vertical rod is connected to the L-shaped component.

[0015] Preferably, the tooling further includes:

[0016] A bracket is used to securely mount the branch pipe assembly onto the vertical rod.

[0017] Preferably, the support is made of an insulating material.

[0018] Preferably, the branch pipe assembly includes:

[0019] A connecting pipe, one end of which is bent and the other end of which has an opening; the bent pipe is connected to the gas source.

[0020] The beneficial technical effects of this application are as follows: The electroplating chromium fixture provided by this application can be used for electroplating workpieces with internal cavities. It is convenient and reliable to install and hang, the fixture is reusable, and all parts can be disassembled and replaced. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a tooling for electroplating chromium in deep holes of pistons provided in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the structure of a branch pipe assembly provided in an embodiment of this application. Detailed Implementation

[0023] Please see Figure 1 This application provides a tooling for electroplating chromium in deep holes of pistons, including a branch pipe assembly 1 (through pipe 9, connecting column 10, fastening nut 11, wing nut 12), a hook 2, a bolt 3, a nut 4, a connecting rod 5, a bracket 6, an insulating bolt 7, and an insulating nut 8.

[0024] One end of the tooling hook 2 is connected to the connecting rod 5 via bolts 3 and nuts 4, and the connecting rod 5 is adapted to the size of the workpiece. The branch pipe assembly 1 is connected to the upper end of the hook 2 via insulating bolts 7 and insulating nuts 8. The through pipe 9 on the branch pipe assembly 1 serves as an auxiliary anode, extending into the inner hole of the workpiece. The through pipe 9 is connected to the connecting post 10, and the fastening nut 11 and wing nut 12 are used to fasten the wire.

[0025] Among them, hook 2 is made of copper, bolt 3, nut 4, and connecting rod 5 are made of metal, such as stainless steel. Bracket 6, insulating bolt 7, and insulating nut 8 are made of insulating material, such as nylon. Through pipe 9, connecting post 10, fastening nut 11, and wing nut 12 can be made of titanium alloy.

[0026] The hook 2 is connected to the cathode and is made of copper, which can enhance conductivity. However, the part that enters the plating solution must be isolated and protected with protective tape to prevent metal dissolution from affecting the plating solution.

[0027] The connecting rod 5 is fixedly connected to the hook 2 by bolts 3 and nuts 4. The connecting rod 5 is mainly used to support the parts and can be adapted to the size of the workpiece by thread.

[0028] The branch pipe assembly 1 is fixed to the bracket 6 and secured to the hook 2 by insulating bolts 7 and insulating nuts 8, ensuring the stability of the branch pipe assembly 1 and that its center position matches the inner cavity of the workpiece. The branch pipe assembly 1 is connected to the anode, therefore the bracket 6, insulating bolts 7, and insulating nuts 8 are made of insulating material to prevent direct connection between the cathode and anode.

[0029] In the embodiments of this application, please refer to Figure 2 The branch pipe assembly 1 consists of a through pipe 9, a connecting post 10, a fastening nut 11, and a wing nut 12. The through pipe 9 extends vertically into the center of the workpiece's inner cavity, serving as an auxiliary anode and providing conductivity. The through pipe 9 is a hollow circular tube with several small holes evenly distributed throughout its body. One end is connected to dry, clean compressed air to relieve pressure within the workpiece's inner cavity and displace the plating solution. The through pipe 9 is made of a material with conductive and corrosion-resistant properties. It can be made of lead pipe; considering the difficulty in processing lead pipe, it can also be made of titanium alloy. However, titanium alloy has lower conductivity than lead, so surface treatment can be applied to the titanium alloy.

[0030] The connecting post 10 is connected to the through pipe 9, and the through pipe 9 is connected to the anode wire. The fastening nut 11 and the wing nut 12 are used to fasten the wire. The specific implementation method is as follows:

[0031] In other embodiments of this application, the piston deep hole electroplating chromium tooling includes a guide hook 2, two bolts 3, two nuts 4, a connecting rod 5, a bracket 6, an insulating bolt 7, an insulating nut 8, and a branch pipe assembly 1 (a through pipe 9, a connecting post 10, a fastening screw 11, and a wing nut 12).

[0032] The electroplated chrome tooling hook 2 is made of copper; the bracket 6, insulating bolt 7, and insulating nut 8 are made of insulating material; the rest are made of stainless steel, titanium alloy, and other materials.

[0033] In one feasible implementation, a hook 2 is first connected and fixed to a connecting rod 5 using bolts 3 and nuts 4. A branch pipe assembly 1 is connected to a bracket 6 and fixed to the hook 2 using insulating bolts 7 and insulating nuts 8. A through-tube 9 on the branch pipe assembly 1 extends vertically into the workpiece cavity, and a connecting post 10 is connected to the through-tube 9. The connecting post 10 is used to connect wires and is secured with a fastening screw 11 and a wing nut. The lengths of the hook 2 and through-tube 9 can be adjusted according to the size of the workpiece, and a bracket 6 can be added to prevent the branch pipe assembly 1 from shaking.

[0034] The use of this tooling ensures that the coating is deposited and uniform in the deep cavity of the piston, thus guaranteeing the quality of the coating.

Claims

1. A tooling for electroplating chromium in deep holes of pistons, characterized in that, The tooling includes: A connecting rod is disposed at the bottom of the workpiece, and the connecting rod is used to support the workpiece; A hook assembly, one end of which is connected to the connecting rod, and the other end of which is connected to the cathode of the process tank; A branch pipe assembly has a connecting post that is connected to the anode of a process tank. One end of the branch pipe assembly can penetrate into the workpiece, and the other end of the branch pipe assembly is connected to a gas source.

2. The tooling according to claim 1, characterized in that, The bottom of the workpiece has threads, one end of the connecting rod is provided with a threaded hole, and the other end of the connecting rod is provided with a through hole; one end of the connecting rod is connected to the bottom of the workpiece by threads.

3. The tooling according to claim 2, characterized in that, The hook assembly includes: A hook is connected to the cathode of the process tank; A vertical rod, one end of which is connected to the hook; The L-shaped component is connected to the other end of the connecting rod by bolts and nuts; wherein, the other end of the vertical rod is connected to the L-shaped component.

4. The tooling according to claim 3, characterized in that, The tooling also includes: A bracket is used to securely mount the branch pipe assembly onto the vertical rod.

5. The tooling according to claim 4, characterized in that, The support is made of insulating material.

6. The tooling according to claim 1, characterized in that, The branch assembly includes: A connecting pipe, one end of which is bent and the other end of which has an opening; the bent pipe is connected to the gas source.

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