A magnetic type semi-open clamp anti-leakage local chemical nickel plating device

Abstract

A kind of magnetic type half-open clamp anti-leakage local electroless nickel plating device belongs to electronic component manufacturing technical field.It includes base, top plate, elastic sealing layer, magnet, bolt.The base includes base body, base cavity, fixed screw hole, the base cavity is half-open cavity, the cavity is designed as cylindrical shape, the cavity inner diameter is greater than the diameter of tube cap pin area, the cavity depth is greater than the length of pin;The top plate includes top plate body, top plate through hole, top plate fixed hole, groove, the layout, shape and transverse size of top plate through hole are consistent with base cavity, the shape and transverse size of top plate fixed hole are consistent with fixed screw hole, groove is located at the upper end of top plate through hole, shape and depth are consistent with magnet;Magnet adopts annular magnet, is nested and fixed in groove.Solve the problem of low efficiency and gold layer pollution in the process of metal direct insertion packaging device energy storage welding cap, and is widely used in electronic components, automobile parts, medical devices and other fields.

Description

Technical Field

[0001] This utility model belongs to the field of electronic component manufacturing technology, and more specifically to the field of electronic component electroplating technology. In particular, it relates to a magnetic semi-open clamp anti-leakage local chemical nickel plating device. Background Technology

[0002] In the capping process of metal through-hole packaged devices, energy storage welding technology achieves welding by applying instantaneous voltage and pressure, utilizing the pulse current generated by capacitor charging and discharging to create Joule heat at the workpiece contact surface. However, this process has two key problems: First, during the welding process, the metal protective layer in the crimped area where the conductive metal clamp contacts the cap surface is damaged due to the instantaneous high pressure, and the exposed substrate material is prone to oxidation and corrosion; Second, chemical nickel plating is required to protect the crimped area, but the pins and base surfaces of the packaged device are all functional gold layers, and it is necessary to strictly ensure that the gold layer is not contaminated during the nickel plating process.

[0003] To address the aforementioned contradictions, the industry primarily employs two masking solutions: Black glue spraying method: A masking colloid is sprayed onto the surface of the cap to isolate the plating solution, but the spraying area overlaps with the printed text on the product, which can easily lead to blurred or detached markings. Capillary sleeve encapsulation method: The tubular clamp completely wraps the unplated area, but it has problems such as complicated clamping and positioning (requiring 0.01mm accuracy) and low operation efficiency (the operation time per piece increases by 40%).

[0004] The main drawbacks of both schemes are: There is a 5μm-10μm micro-gap at the junction of the cap and the pin, and the plating solution can penetrate through capillary action (the penetration rate reaches 0.5mm / s when the contact angle is <30°). Traditional physical sealing relies on the rigid fit between the fixture and the workpiece, with the actual contact area reaching only 60-70%, and the residual gaps leading to a gold layer contamination rate as high as 12-15%.

[0005] Such contamination can induce brittle phases (such as Ni3Au4) at the interface during subsequent reflow soldering. After 200 thermal cycles (-55℃ to 125℃), the lead root fractures due to stress concentration, with a failure rate of up to 8‰. Current processes urgently require the development of solutions that combine precise masking with efficient production.

[0006] The problems with existing technologies are as follows: Problem of plating solution leakage and contamination of the gold layer on the pins: During the electroless nickel plating process, the plating solution can seep in through the tiny gaps at the junction of the traditional fixture and the cap / pin, causing corrosion or contamination of the gold layer on the pins, affecting the conductivity and reliability of the product. This is because traditional shielding fixtures rely on physical adhesion (such as tape or clips), but cannot completely eliminate microscopic gaps, and are prone to failure, especially in dynamic plating solution environments (such as stirring or heating).

[0007] Low clamping efficiency: Full-wrap fixtures need to completely cover the non-plated areas (such as pins), which is complicated to operate and takes a long time to clamp a single piece, making it difficult to meet the needs of mass production.

[0008] A search of the Chinese patent database revealed five applications related to localized electroless nickel plating, mostly filed in recent years. These include: 202280082929.6, "System and Method for Localized Electroless Nickel Plating"; 201910698436.5, "Heating Equipment and Method for Localized Heat Treatment of Flexible, Slender, and Easily Deformable Shaft Parts"; 201811119322.2, "Oil-Free Scroll Air Compressor Scroll Disc"; and 201611209201.8, "A Method for Localized Electroless Nickel Plating of Complex Titanium Alloy Parts." Currently, there are no applications for a leak-proof localized electroless nickel plating device and method based on a magnetic semi-open clamp.

[0009] In view of the above, this utility model is hereby proposed. Summary of the Invention

[0010] The technical problem to be solved by this utility model is: in the process of energy storage soldering cap of metal through-hole packaged devices, when the bonding area is subjected to local chemical nickel plating, the existing anti-plating solution leakage technology is prone to causing the gold layer on the surface of the metal packaged device pins and base to be contaminated and the efficiency is low.

[0011] The inventive concept of this utility model is to block the penetration path of plating solution into the pin area through a magnetic sealing protection mechanism, ensuring zero gold layer contamination. The semi-open structure and magnetic fixing method simplify the clamping process, reducing single-piece clamping time by more than 90%. Through four core modules—magnetic sealing structure design, corrosion-resistant material system, modular adaptation mechanism, and dynamic process verification—it systematically solves problems such as plating solution leakage, low clamping efficiency, material corrosion, and poor compatibility. The specific logical framework is as follows: (1) Structural design: to block leakage paths and improve clamping efficiency; (2) Material selection: to extend service life and avoid plating solution contamination; (3) Modular adaptation: Supports quick switching between multiple cap specifications; (4) Process verification: Ensure stability under dynamic environment.

[0012] Therefore, this utility model provides a magnetic semi-open clamp anti-leakage localized chemical nickel plating device, such as... Figure 1-5 As shown.

[0013] Includes: base 1, top plate 2, elastic sealing layer 3, magnet 4, bolt 5.

[0014] The base 1 includes a base body, a base cavity 101, and a fixing screw hole 102. The base cavity 101 is a semi-open cavity (i.e., it does not form a through hole), and the cavity is designed in a cylindrical shape to better fit standard cylindrical tube caps. The inner diameter of the cavity is slightly larger than the diameter of the tube cap pin area, and the diameter of the top open area is 0.05mm-0.3mm smaller than the diameter of the tube base, ensuring that the product (i.e., the part to be plated) can be smoothly inserted and accurately positioned. The depth of the cavity is greater than the pin length.

[0015] The top plate 2 includes a top plate body, a top plate through hole 201, a top plate fixing hole 202, and a groove 203. The layout, shape, and lateral dimensions of the top plate through hole 201 are consistent with those of the base cavity 101. The shape and lateral dimensions of the top plate fixing hole 202 are consistent with those of the fixing screw hole 102. The groove 203 is located at the upper end of the top plate through hole 201, is larger than the top plate through hole 201, and has the same shape and depth as the magnet 4, for embedding the magnet 4.

[0016] The magnet 4 is a ring-shaped magnet array, with the magnets nested and fixed in the groove 203 of the top plate.

[0017] The elastic sealing layer 3 is an annular elastic sealing layer (i.e., a fluororubber ring), and the size of the annular hole is consistent with the through hole 201 in the top plate.

[0018] The bolt 5 passes through the top plate through hole 201 and is fixed to the fixing screw hole 102 for bolt fixation.

[0019] Leakage prevention mechanism: Magnetic attraction tightly adheres the bottom of the tube seat to the fixture surface, forming a rigid seal to prevent liquid penetration. Simultaneously, an elastic sealing layer is installed at the top of the fixture cavity. After compression, it ensures a 0.1mm-0.3mm compression between the layer and the tube cap, forming a flexible seal to prevent plating solution leakage.

[0020] Advantages of the technical solution: (1) Dual sealing mechanism: The bottom of the tube seat is attracted by the magnetic array to form the first physical barrier, which effectively blocks the penetration path of the plating solution. At the same time, the elastic sealing ring is deformed under pressure to fill the micro gap between the tube cap and the clamp, thus achieving the second flexible seal.

[0021] (2) Improved clamping efficiency: The clamping time has been reduced from 15-20 seconds with traditional clamps to 2 seconds, greatly improving efficiency.

[0022] (3) Multi-shape adaptability: By changing the inner diameter of the magnet and the spacing between the magnets on the top plate, it can be compatible with caps of different sizes.

[0023] (4) Operation is safe. Magnetic clamping eliminates the need for manual screwing or tape wrapping, preventing operators from coming into contact with corrosive plating solutions.

[0024] This invention can be widely applied in fields such as electronic components, automotive parts, and medical devices. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the assembly structure of the base top plate of this utility model.

[0026] Figure 2 This is a schematic diagram of the assembly structure of the sealing device of this utility model.

[0027] Figure 3 This is a schematic diagram of the overall assembly structure of the fixture of this utility model.

[0028] Figure 4 This is a schematic diagram of the assembly structure of the part to be electroplated according to this utility model.

[0029] Figure 5 This is a schematic diagram of the assembly structure of the sealing system of this utility model.

[0030] Figure 6 This is a schematic diagram of the external structure of the part to be plated (TO-type circular packaged product) of this utility model.

[0031] In the diagram: 1 is the base, 101 is the base cavity, 102 is the fixing screw hole, 2 is the top plate, 201 is the top plate through hole, 202 is the top plate fixing hole, 203 is the groove, 3 is the elastic sealing layer, 4 is the magnet, 5 is the bolt, and 6 is the part to be electroplated. Detailed Implementation

[0032] like Figure 1-6 As shown, the magnetic semi-open clamp anti-leakage local chemical nickel plating device, taking a TO-type circular packaged product (the part to be plated) as an example, is specifically implemented as follows: 1. Fixture structure The diameter of the open area at the top of the cavity is 0.1 mm smaller than the diameter of the tube socket. The cavity depth is set to 120% of the pin length, with a 20% space reserved to prevent the pin from colliding with the cavity. The tube cap is completely exposed outside the cavity to ensure that the plating solution can fully cover the pin area during the nickel plating process.

[0033] The magnets are N52 grade neodymium iron boron magnets with nickel plating to enhance corrosion resistance; each magnet has a magnetic force ≥0.5T. After the magnets are embedded in the grooves, they are encapsulated with epoxy resin to prevent them from falling out during use. During encapsulation, the magnets are nickel-plated to a thickness >5μm to further enhance their corrosion resistance.

[0034] After the elastic sealing layer is compressed, it ensures a compression of 0.2 mm between it and the cap.

[0035] The base body and top plate body are made of PTFE (polytetrafluoroethylene) material. This material has excellent corrosion resistance and insulation properties, effectively preventing galvanic corrosion. Its density is 2.14-2.20 g / cm³, and its hardness is Shore D55-65, which meets the requirements for use in the electroless nickel plating process.

[0036] The bolt is an M8 bolt.

[0037] The top plate adopts a standardized M8 threaded interface design and is connected to the fixture base body by screws.

[0038] For different cap sizes, magnets with different inner diameters and corresponding elastic sealing layers can be selected.

[0039] The sealing layer is made of fluororubber, with an inner diameter ranging from 5mm to 20mm, to meet the needs of different specifications of pipe caps.

[0040] 2. Process flow and verification aspects Taking the application of electroless nickel plating on standard cylindrical tube caps as an example: (1) Specific structure and parameters Fixture body material: PTFE (polytetrafluoroethylene), temperature resistance -200~260℃, chemical corrosion resistant.

[0041] The base measures 200mm x 140mm, with an inner diameter of 15mm and a depth of 30mm.

[0042] Magnet type: N52 grade neodymium iron boron magnet, magnet inner diameter: 5.6mm, magnet outer diameter: 11.6mm, surface plated with nickel (thickness 5μm).

[0043] Circular array: 48 magnets are evenly distributed with a spacing of 20mm.

[0044] Elastic sealing layer: made of fluororubber (Shore hardness 50A, acid and alkali resistance grade A, thickness 2mm, outer diameter 7.8mm).

[0045] (2) Operation procedure: Pretreatment: Place the cap in an ultrasonic cleaner and clean it for 5 minutes at a frequency of 40kHz at room temperature to remove oil and impurities from the surface of the cap. Clamping: Insert the pipe cap into the clamp cavity, and it will be automatically magnetically attracted and fixed. Nickel plating: Immerse the fixture and cap in the plating solution, maintaining the solution temperature at 85℃ and the pH value at 4.5. Use mechanical stirring at a speed of 200 rpm for 30 minutes. Post-processing: After nickel plating is completed, remove the fixture, rinse the surface of the cap with clean water to remove any remaining plating solution, and then dry it with compressed air.

[0046] (3) Verification results: Leakage rate: The leakage rate was tested using the fluorescent dye method at 25℃ and 50%RH. The test was repeated 10 times, and no leakage was found. The leakage rate was 0%. Clamping efficiency: The single-piece operation time is reduced from 15 seconds with traditional clamps to 2 seconds, greatly improving clamping efficiency; Lifespan: After long-term use testing, the lifespan of neodymium iron boron magnets is expected to be around 20 years, meeting the needs of long-term use.

[0047] Finally, it should be noted that the above embodiments are merely examples for clear illustration. This utility model includes, but is not limited to, the above embodiments, and it is neither necessary nor possible to exhaustively describe all implementation methods. Those skilled in the art can make other variations or modifications based on the above description. All implementation schemes that meet the requirements of this utility model are within the protection scope of this utility model.

Claims

1. A magnetic semi-open clamp anti-leakage localized chemical nickel plating device, characterized in that: Includes base, top plate, elastic sealing layer, magnet, and bolts; The base includes a base body, a base cavity, and a fixing screw hole. The base cavity is a semi-open cavity, and the cavity is designed to be cylindrical. The inner diameter of the cavity is larger than the diameter of the tube cap pin area. The diameter of the top open area is 0.05mm-0.3mm smaller than the diameter of the tube seat. The depth of the cavity is greater than the pin length. The top plate includes a top plate body, a top plate through hole, a top plate fixing hole, and a groove. The layout, shape, and lateral dimensions of the top plate through hole are consistent with the base cavity. The shape and lateral dimensions of the top plate fixing hole are consistent with the fixing screw hole. The groove is located at the upper end of the top plate through hole, and its size is larger than that of the top plate through hole. Its shape and depth are consistent with the magnet, and it is used to embed the magnet. The magnets are arranged in a ring-shaped array, with the magnets nested and fixed in the groove of the top plate; The elastic sealing layer is a fluororubber ring, and the size of the ring hole is the same as the through hole in the top plate. The bolt passes through the through hole in the top plate and is fixed in the screw hole.

2. The magnetic semi-open clamp anti-leakage localized chemical nickel plating device as described in claim 1, characterized in that: The diameter of the open area at the top of the cavity is 0.1 mm smaller than the diameter of the tube seat; the cavity depth is set to 120% of the pin length.

3. The magnetic semi-open clamp anti-leakage localized chemical nickel plating device as described in claim 1, characterized in that: The magnet is an N52 grade neodymium iron boron magnet with a nickel-plated surface and a thickness of >5μm; the magnet is encapsulated in a groove with epoxy resin.

4. The magnetic suction type semi-open clamp anti-leakage local chemical nickel plating device as described in claim 1, characterized in that: The elastic sealing layer is made of fluororubber and has an inner diameter ranging from 5mm to 20mm.

5. The magnetic semi-open clamp anti-leakage localized chemical nickel plating device as described in claim 1, characterized in that: The base body and top plate body are made of polytetrafluoroethylene.

6. The magnetic semi-open clamp anti-leakage localized chemical nickel plating device as described in claim 1, characterized in that: The bolt is an M8 bolt.

7. The magnetic semi-open clamp anti-leakage localized chemical nickel plating device as described in claim 1, characterized in that: The base body measures 200mm × 140mm, with an inner diameter of 15mm and a cavity depth of 30mm.

8. The magnetic semi-open clamp anti-leakage localized chemical nickel plating device as described in claim 1, characterized in that: The magnet has an inner diameter of 5.6 mm, an outer diameter of 11.6 mm, and a nickel plating thickness of 5 μm.

9. The magnetic semi-open clamp anti-leakage localized chemical nickel plating device as described in claim 1, characterized in that: The magnets consist of 48 pieces, with a spacing of 20mm between them.

10. The magnetic suction type semi-open clamp anti-leakage local chemical nickel plating device as described in claim 1, characterized in that: The thickness of the elastic sealing layer is 2 mm, and the outer diameter is 7.8 mm.

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