A local chromium plating protection tool

Abstract

The utility model belongs to the field of chromium electroplating process technology, specifically relates to a kind of local chromium electroplating protective tool, shielding protection is carried out to non-electroplating area in the process of chromium electroplating, and it is applicable to the metal or non-metal workpiece needing selective chromium electroplating.The currently commonly used technical operation is tedious, the cost is higher, the environmental protection is poor, and the protection precision is not enough.The utility model is made of a kind of local chromium electroplating protective tool with openwork structure by material and structure design combination.Because the dispersity of chromium electroplating is poor, the non-chromium plating surface of workpiece cannot produce chromium plating layer under the coverage of tool, and only the surface of part exposed to plating solution in the openwork of tool can produce chromium plating layer.

Description

Technical Field

[0001] This utility model belongs to the field of electroplating chromium technology, specifically relating to a protective fixture for partial electroplating chromium, which shields and protects non-electroplated areas during the electroplating process, and is suitable for metal or non-metal workpieces that require selective electroplating of chromium. Background Technology

[0002] Electroplating, as a typical surface treatment process, is often used to protect metal surfaces from corrosion and extend the lifespan of workpieces. In actual production, it is necessary to select the appropriate plating metal based on the function and service environment of the workpiece. Often, only localized electroplating is required, or different locations on the same workpiece need different metal plating layers (e.g., localized chromium plating with cadmium passivation on the rest). Therefore, effective protection of insulated parts is particularly important in actual production.

[0003] Currently used techniques include applying protective adhesives, coating with protective adhesives, waxes, and protective paints. These methods are cumbersome, costly, environmentally unfriendly, and lack sufficient protective precision. Especially for workpieces with partial chromium plating and cadmium passivation of the rest, it is often necessary to first perform overall chromium plating, then partial chromium removal, and finally cadmium passivation. This process is complex and inefficient. After protection using traditional techniques, the edges of the adhesive film are uneven, with excess protective material often overflowing. It is also prone to peeling during cutting, resulting in poor protective effects in practical applications and leaving residue during final removal. Summary of the Invention

[0004] This invention combines material and structural design to create a protective fixture for partial electroplating of chromium with a hollow structure. Due to the poor dispersion of electroplated chromium, the non-chromium-plated surface of the workpiece cannot form a chromium plating layer under the cover of the fixture; only the surface of the part at the hollow part of the fixture is exposed to the plating solution and can form a chromium plating layer.

[0005] This utility model proposes a protective fixture for localized electroplating of chromium. The fixture includes a pair of main frames installed opposite each other. The main frames have a U-shaped bending structure, including a flat part, a left bending part and a right bending part. The part is clamped between the main frames. Depending on the specific location and shape of the localized chromium plating of the part, the fixture has a hollow structure in the corresponding area.

[0006] Advantageously, the protective workwear is formed from sheet metal steel plates.

[0007] Advantageously, the protective workwear is covered with a protective paint layer.

[0008] Advantageously, the main frame has several connection holes.

[0009] Advantageously, the main frame is fixed together by high-strength stainless steel bolts and nuts.

[0010] Advantageously, a rounded transition design is used at the bend.

[0011] Beneficial effects: It effectively solves the shortcomings of traditional protective equipment, such as poor applicability, high cost, and short service life, and is especially suitable for operation scenarios where precise protection is required for non-electroplated areas of workpieces. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main frame of one side of the tooling; Figure 2 Schematic diagram of screws and nuts; Figure 3 This is a schematic diagram showing the state of the tooling clamping the parts. Detailed Implementation

[0013] Structural design This tooling has a pair of integrated sheet metal bending main frames, see [link / reference]. Figure 1 The schematic diagram of the main frame on one side shows that the main frame has a U-shaped bending structure, which is bent into a wrapping curved surface that matches the shape of the part. It includes a flat part 1, a left bending part 2, and a right bending part 3. The bending points of the left bending part 2 and the right bending part 3 with the flat part 1 adopt an arc transition design to avoid stress concentration and effectively protect the non-electroplated surface from contamination.

[0014] Based on the local chrome plating requirements of the parts, the main frame is selectively hollowed out on the surfaces that need chrome plating, ensuring that the local chrome plating surfaces are exposed to the plating solution. This effectively avoids the previously used process of partial chrome removal after overall chrome plating, and effectively simplifies the process.

[0015] To ensure a tight fit between the tooling and the parts and improve protective effectiveness, the tooling has multiple connection holes. The opposing main frame is fixed using standardized high-strength stainless steel bolts (5 bolts) and nuts (4 nuts). For ease of installation and disassembly, all bolts and nuts used in this tooling are of the same type. This allows for efficient clamping and disassembly, significantly improving production efficiency compared to traditional protection methods.

[0016] Material selection and surface treatment This protective fixture is made of stainless steel sheet metal, which has high strength, is not easily deformed during clamping, and is reusable. Furthermore, the fixture needs to be exposed to harsh environments such as strong acids, strong alkalis, and high-temperature electroplating solutions for extended periods. Stainless steel has strong corrosion resistance, effectively reducing the frequency of fixture replacement and lowering costs. In addition, the fixture surface is painted, and the functional coating provides the workpiece with additional protection. The paint layer effectively prevents rust and also acts as an insulating layer, preventing electroplating solutions from corroding the fixture substrate.

[0017] Figure 3In this process, a pair of tooling fixtures are symmetrically clamped on both sides of the part and fixed with screws and nuts that pass through the tooling fixtures and the part. Due to the poor dispersibility of the plating solution during the chromium plating process, after assembly, except for the chromium-plated surface, no chromium plating layer can be formed on the other protective surfaces, thus achieving selective local electroplating of chromium.

Claims

1. A protective fixture for localized electroplating of chromium, characterized in that: The fixture includes a pair of main frames installed opposite each other. The main frames have a U-shaped bending structure, including a flat part (1), a left bending part (2) and a right bending part (3). The parts are clamped between the main frames. Depending on the specific location and shape of the chrome plating of the parts, the fixture has a hollow structure in the corresponding area.

2. The protective fixture for partial electroplating of chromium according to claim 1, characterized in that: The protective gear is made of sheet metal.

3. The protective fixture for partial electroplating of chromium according to claim 1, characterized in that: The protective workwear is covered with a protective paint layer.

4. The protective fixture for partial electroplating of chromium according to claim 1, characterized in that: The main frame has several connection holes.

5. The protective fixture for partial electroplating of chromium according to claim 4, characterized in that: The main frame is connected and fixed by high-strength stainless steel bolts (5) and nuts (4).

6. The protective fixture for partial electroplating of chromium according to claim 1, characterized in that: The bends are designed with rounded transitions.

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