An electroplating fixture for sealing through holes in parts

Abstract

This application relates to an electroplating fixture for sealing through-holes in parts, comprising an outer surface shielding part, an inner hole plug, an end face shielding part, and a conductive device. The outer surface shielding part has a shielding cavity that surrounds the outer surface of the part, with a mounting hole at one end and an open end at the other. The inner hole plug is disposed within the through-hole of the part, shielding the non-electroplating area. The end face shielding part is installed at the open end of the part via a first sealing ring, shielding the end face and adjacent outer surface. The conductive device includes a negative conductive component and a positive conductive component: the negative component is installed in the end face shielding part and electrically connected to the surface of the part; the positive component includes a conductive post and a mounting bracket, with one end of the conductive post extending into the electroplating area of ​​the through-hole and the other end fixed to the mounting bracket. This fixture completely prevents plating solution leakage through synergistic shielding and sealing, ensuring that the outer surface, end face, and non-electroplating area of ​​the through-hole are free of plating layer coverage; simultaneously, it enables non-destructive current conduction through the part and direct current flow to the electroplating area within the hole, significantly improving plating uniformity and electroplating efficiency.

Description

Technical Field

[0001] This application relates to the field of electroplating tooling, and in particular to an electroplating tooling for sealing through holes in parts. Background Technology

[0002] In the electroplating process of precision parts (such as hydraulic valve blocks and connector housings), it is often necessary to electroplat specific areas (electroplated areas) on the inner walls of through holes, while ensuring that other outer surfaces, end faces, and non-electroplated areas of the through holes are completely shielded to avoid unnecessary plating affecting the function or assembly of the parts. This poses a severe challenge to the precision shielding and reliable conductivity of electroplating tooling.

[0003] Existing shielding solutions struggle to achieve precise separation between electroplated and non-electroplated areas within through-holes, while simultaneously protecting the outer surface and end faces of components. Common integral shielding sleeves or simple plugs often suffer from inadequate sealing and inaccurate boundary control, leading to plating solution seeping into non-target areas or plating damage to non-electroplated areas, severely impacting product quality.

[0004] When it is necessary to shield the end face and adjacent outer surface of a component, the traditional method of holding the conductive material with a hanger will occupy or damage the area that needs to be shielded. It cannot introduce the current stably and without damage into the electroplating area inside the through hole, and it is easy to interfere with the shielding effect. Utility Model Content

[0005] The purpose of this application is to provide an electroplating fixture for sealing through holes in parts, which can effectively solve the two technical problems of partitioned shielding of the inner wall of the through hole, coordinated shielding of the outer surface and end face, and non-destructive and reliable conduction to the electroplating area inside the hole.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] An electroplating fixture for sealing through-holes of parts includes an outer surface shielding part, an inner hole plug, an end face shielding part, and a conductive device. The outer surface shielding part has a shielding cavity for placing the part, one end of the outer surface shielding part is provided with a mounting hole communicating with one end of the shielding cavity, and the other end of the shielding cavity is an open end. The inner hole plug is disposed in a first through-hole of the part to shield the non-electroplated area of ​​the through-hole of the part. The end face shielding part is installed on the open end of the part through a first sealing ring to shield the outer surface of the part near the open end and the end face of the open end. The conductive device includes a negative electrode conductive component and a positive electrode conductive component. The negative electrode conductive component is installed on the end face shielding part and electrically connected to the surface of the part. The positive electrode conductive component includes a conductive post and a mounting bracket. One end of the conductive post is located in the electroplated area of ​​the through-hole of the part, and the other end of the conductive post is installed on the mounting bracket.

[0008] Furthermore, the negative electrode conductive component includes at least one glass bead screw.

[0009] Furthermore, the negative electrode conductive component includes two glass bead screws.

[0010] Furthermore, the mounting bracket has extensions on both sides, and the extensions are mounted on the end face shield by screws.

[0011] Furthermore, the mounting bracket has a hanging hole.

[0012] Furthermore, the hanging hole is triangular, and each corner is a rounded arc.

[0013] Furthermore, a first through hole and a second through hole are provided at the center line of the mounting bracket. The first through hole is located at the upper end of the mounting bracket, and the second through hole is located at the lower end of the mounting bracket. Both the first through hole and the second through hole are located on the center line of the mounting bracket. The conductive post passes through the first through hole and the second through hole from top to bottom and is then fixed to the mounting bracket by screws.

[0014] Furthermore, the lower end of the inner hole plug is provided with a first threaded hole, and the lower end of the outer surface shield is provided with a first screw. The first screw passes through the outer surface shield and is threadedly connected to the first threaded hole of the inner hole plug, thereby locking the inner hole plug onto the outer surface shield.

[0015] Furthermore, the upper end of the inner hole plug is provided with a guide groove with a tapered cross section.

[0016] Furthermore, the inner hole plug is made of polypropylene material.

[0017] The beneficial effects of this application are:

[0018] (1) In this application, the shielding cavity formed by the outer surface shielding part wraps around the outer surface of the part, and the inner hole plug is precisely inserted into the through hole and positioned to shield the non-electroplated area. The end face shielding part is tightly installed at the open end of the part in conjunction with the first sealing ring, effectively shielding the end face and its adjacent outer surface. These three components work together to form a complete shielding system that provides both internal and external protection. The first sealing ring ensures the sealing of the end face shielding, effectively preventing the plating solution from seeping into non-target areas, ensuring that the non-electroplated areas (including the designated part of the through hole, the outer surface, and the end face) are completely unplated, significantly improving product yield and quality.

[0019] (2) The negative electrode conductive component of this application is directly installed on the end face shield and electrically connected to the surface of the shielded part, avoiding the clamping damage and occupation of the shielding position of traditional hangers on the external surface or end face. The core of the positive electrode conductive component is the conductive post, one end of which extends directly into the area to be electroplated in the through hole of the part and is fixed by the mounting bracket to ensure that an effective current loop is formed with the electroplating solution and the target electroplating surface. The negative electrode connection point is located in the shielded protection area, without damaging the appearance and functional surface; the positive electrode conductive post reaches the electroplating area in the hole directly, the current path is short and direct, which greatly reduces current loss and improves electroplating efficiency and coating uniformity. At the same time, the conductive device is completely independent of the shielding function and does not interfere with each other, ensuring the integrity of the shielding and the stability of the conductivity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an electroplating fixture for sealing through holes in a part, provided in one embodiment of this application;

[0021] Figure 2 A front view of an electroplating fixture for sealing through-holes in a part, provided in an embodiment of this application;

[0022] Figure 3 for Figure 2 Sectional view at AA;

[0023] Figure 4 This is an exploded structural diagram of an electroplating fixture for sealing through holes in a part, provided in an embodiment of this application.

[0024] Figure 5 for Figure 4 Sectional view at BB;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Outer surface shielding part; 2. Inner hole plug; 3. End face shielding part; 4. Conductive device; 5. Parts;

[0027] 11. Shielding cavity; 12. Mounting hole; 13. Open end;

[0028] 51. First through hole; 52. Non-electroplated area; 53. Electroplated area;

[0029] 31. First sealing ring;

[0030] 54. First outer surface; 55. First end face;

[0031] 41. Negative conductive component; 42. Positive conductive component;

[0032] 421. Conductive post; 422. Mounting bracket;

[0033] 4221. Extension; 4222. Hanging hole;

[0034] S, centerline; 4223, first via; 4224, second via;

[0035] 21. First threaded hole; 22. First screw; 23. Guide groove; Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," etc., are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In particular, the understanding of the term "upper" following a noun in the claims should be understood as meaning that the entire inner and outer surfaces of the structure referred to by the noun conform to the definition of "upper."

[0038] The following detailed description, in conjunction with the accompanying drawings and preferred embodiments, describes the specific implementation methods, structures, features, and effects provided in this application.

[0039] like Figures 1 to 5 As shown, an electroplating fixture for sealing through-holes of parts includes an outer surface shielding part 1, an inner hole plug 2, an end face shielding part 3, and a conductive device 4. The outer surface shielding part 1 has a shielding cavity 11 for placing the part 5. One end of the outer surface shielding part 1 is provided with a mounting hole 12 communicating with one end of the shielding cavity 11, and the other end of the shielding cavity 11 is an open end 13. The inner hole plug 2 is disposed in the first through-hole 51 of the part 5 to shield the non-electroplated area 52 of the through-hole of the part 5. The end face shielding part 3 is installed in the opening of the part 5 through a first sealing ring 31. End 53 is used to shield the first outer surface 54 of the part 5 near the opening end 56 and the first end face 55 of the opening end 56; the conductive device 4 includes a negative conductive component 41 and a positive conductive component 42. The negative conductive component 41 is mounted on the end face shielding part 3 and is electrically connected to the surface of the part 5. The positive conductive component 42 includes a conductive post 421 and a mounting bracket 422. One end of the conductive post 421 is located in the electroplating area 57 of the through hole of the part 5 and extends into the second through hole of the inner hole plug 2. The other end of the conductive post 421 is mounted on the mounting bracket 422.

[0040] like Figure 3As shown, in one embodiment, the negative electrode conductive component 41 includes at least one glass ball screw. The glass ball screw utilizes point contact for conductivity, avoiding damage to the surface of the component 5 from large-area pressing, while the elastic contact adapts to slight surface undulations, ensuring conductive stability.

[0041] A ball screw typically consists of a screw body, an internal spring, and a retractable "glass ball" (usually a metal ball; "glass ball" is the industry term for this type of elastic contact ball). During operation, the screw is threaded onto the component, and the internal spring pushes the ball outward, creating a point contact between the ball and the conductive surface. This point contact significantly reduces the contact area, avoiding scratches or deformation of the component surface that can occur with traditional large-area pressing. Simultaneously, the spring's elasticity adapts to the slight undulations of the contact surface, ensuring reliable contact between the ball and the surface, thus guaranteeing electrical stability.

[0042] like Figure 3 As shown, in one embodiment, the negative electrode conductive component 41 includes two glass ball screws. The two points of symmetrical conduction form a balanced current path, eliminating the uneven polarization of the component 5 caused by single-point conduction and preventing excessively thick electroplating; mechanically, it suppresses the shaking of the component 5.

[0043] like Figure 2 As shown, in one embodiment, the mounting bracket 422 has extensions 4221 on both sides, and the extensions 4221 are mounted on the end face shielding part 3 by screws. The extensions 4221 increase the stress-bearing area and disperse assembly stress; the screw connection enables quick assembly and disassembly, facilitating the replacement of the conductive post 421 or the maintenance of the shielding component.

[0044] like Figure 2 As shown, in one embodiment, the mounting bracket 422 has a hanging hole 4222.

[0045] like Figure 2 As shown, in one embodiment, the hanging hole 4222 is triangular, with each corner rounded. The triangular structure resists torsional stress, and the rounded corners eliminate stress concentration at sharp corners, preventing the hanging hole 4222 from cracking and failing; it is compatible with mainstream triangular hooks for hanging fixtures.

[0046] like Figure 2 and Figure 3As shown, in one embodiment, a first through hole 4223 and a second through hole 4224 are provided at the center line S of the mounting bracket 422. The first through hole 4223 is located at the upper end of the mounting bracket 422, and the second through hole 4224 is located at the lower end of the mounting bracket 422. Both the first through hole 4223 and the second through hole 4224 are located on the center line S of the mounting bracket 422. The conductive post 421 passes through the first through hole 4223 and the second through hole 4224 from top to bottom and is then fixed to the mounting bracket 422 by screws. The first through hole 4223 facilitates the installation of the conductive post 421, and the second through hole 4224 coaxially constrains the conductive post 421, forcibly maintaining its verticality and preventing tilting that could cause distortion of the electric field inside the hole. The screws are tightened to prevent electroplating vibration from causing displacement.

[0047] like Figure 5 As shown, in one embodiment, the lower end of the inner hole plug 2 is provided with a first threaded hole 21, and the lower end of the outer surface shield 1 is provided with a first screw 22. The first screw 22 passes through the outer surface shield and is threadedly connected to the first threaded hole 21 of the inner hole plug 2, thereby locking the inner hole plug 2 onto the outer surface shield 1. The screw of the outer surface shield 1 is screwed into the threaded hole of the plug to achieve bidirectional locking, preventing the plug from axially moving or rotating circumferentially, which could lead to sealing failure.

[0048] like Figure 5 As shown, in one embodiment, the upper end of the inner hole plug 2 is provided with a guide groove 23 with a conical cross-section. When the conductive post 421 is inserted, the conical surface guides it to automatically center.

[0049] In one embodiment, the inner plug 2 is made of polypropylene. It is resistant to acid and alkali plating solutions (extending lifespan by more than 3 times), has an insulation resistance >10¹²Ω, completely blocking stray currents; and has low water absorption to prevent swelling and deformation. This ensures long-term shielding reliability and safety.

[0050] The embodiments described above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. An electroplating tooling for sealing a through-hole of a part, characterized by: It includes an outer surface shield, an inner hole plug, an end face shield, and a conductive device; The outer surface shielding part has a shielding cavity for placing parts, one end of the outer surface shielding part is provided with a mounting hole communicating with one end of the shielding cavity, and the other end of the shielding cavity is an open end; The inner hole plug is placed inside the first through hole of the part to shield the non-electroplated area of ​​the through hole of the part. The end face shielding part is installed at the open end of the part through the first sealing ring, and is used to shield the outer surface of the part near the open end and the end face of the open end. The conductive device includes a negative conductive component and a positive conductive component. The negative conductive component is mounted on the end face shield and is electrically connected to the surface of the part. The positive conductive component includes a conductive post and a mounting bracket. One end of the conductive post is located in the electroplating area of ​​the through hole of the part, and the other end of the conductive post is mounted on the mounting bracket.

2. The electroplating fixture for sealing through holes in parts according to claim 1, characterized in that: The negative electrode conductive component includes at least one glass bead screw.

3. The electroplating fixture for sealing through holes in parts according to claim 2, characterized in that: The negative electrode conductive component includes two glass ball screws.

4. The electroplating fixture for sealing through holes in parts according to claim 1, characterized in that: The mounting bracket has extensions on both sides, and the extensions are mounted on the end face shield by screws.

5. The electroplating fixture for sealing through holes in parts according to claim 1, characterized in that: The mounting bracket has a hanging hole.

6. The electroplating fixture for sealing through holes in parts according to claim 5, characterized in that: The hanging hole is triangular, and each corner is a rounded corner.

7. The electroplating fixture for sealing through holes in parts according to claim 1, characterized in that: The mounting bracket has a first through hole and a second through hole at its center line. The first through hole is located at the upper end of the mounting bracket, and the second through hole is located at the lower end of the mounting bracket. Both the first through hole and the second through hole are located on the center line of the mounting bracket. The conductive post passes through the first through hole and the second through hole from top to bottom and is then fixed to the mounting bracket by screws.

8. The electroplating fixture for sealing through holes in parts according to claim 1, characterized in that: The lower end of the inner hole plug is provided with a first threaded hole, and the lower end of the outer surface shield is provided with a first screw. The first screw passes through the outer surface shield and is threadedly connected to the first threaded hole of the inner hole plug, thereby locking the inner hole plug onto the outer surface shield.

9. An electroplating fixture for sealing through holes in parts according to claim 1, characterized in that: The upper end of the inner hole plug is provided with a guide groove with a tapered cross section.

10. The electroplating fixture for sealing through holes in parts according to claim 1, characterized in that: The inner hole plug is made of polypropylene.

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