Electroplating deep blind hole protection tool

Abstract

The electroplating deep blind hole protection tool comprises an embedded rod, an elastic plug and a steel screw, the embedded rod and the elastic plug are columnar components; the total length of the embedded rod and the elastic plug is smaller than the length of the blind hole. The embedded rod is coaxially connected with the silica gel plug through a steel screw; the embedded rod is installed in the blind hole in a sliding fit mode, and a gap is reserved between the outer circumference of the embedded rod and the inner wall of the blind hole. And the outer diameter of the silica gel plug is matched with the aperture of the corresponding blind hole. According to the utility model, a part equipped with the tool is placed in an electroplating solution, and the deep part of the blind hole can be plugged. And air in the blind hole is exhausted by the embedded rod, so that production accidents possibly caused by ejection of the tool due to thermal expansion of the air in the electroplating process are avoided. Under the protection of the tool, the deep part of the blind hole is isolated from the corrosion of an electroplating solution, and the outer part of the part and the position, close to the hole opening, of the blind hole are electroplated to obtain a protective layer, so that the part is effectively protected.

Description

Technical Field

[0001] The utility model belongs to a production tool, in particular to an electroplating deep blind hole protection tool. Background Art

[0002] Electroplating copper is currently a commonly used method for carburizing and nitriding protection of parts. Affected by the electroplating dispersion and coverage capabilities in the process, the ability of the coating to be evenly distributed on the parts and the integrity of the coating in the grooves or deep holes are not high. According to the acceptance requirements for electroplating copper and actual processing experience, when the inner surface of the blind hole is not using an anode, the coating thickness is not required for the part with a depth less than or equal to 2 times the diameter; the part with a depth greater than 2 times the diameter is allowed to be without a copper layer. When electroplating copper on steel, the copper layer belongs to the cathodic protection layer. When a part has a deep blind hole and cannot form an electric field with the anode, the copper plating layer cannot be deposited in this area, so that only a thin layer of copper is floating on the steel substrate at this location. At this time, there will be holes in the copper layer, thus forming a tiny battery of "copper-solution-iron". Copper is the cathode and iron is the anode. Due to the electrochemical effect, the corrosion of iron is accelerated, so the cathodic protection layer must have a considerable thickness, and the small holes in the coating need to be minimized, otherwise it will not only fail to effectively protect the metal inside, but will promote its corrosion.

[0003] like Figure 1 As shown, the part has a deep blind hole inside. Taking the structure of this part as an example, the acid sulfate electroplating method is used for this part. According to the nitriding protection requirements, the copper plating layer thickness should be 40-70um, and the processing time in the acid copper plating tank is more than 120 minutes. If the blind hole of the part is immersed in a solution containing sulfuric acid for a long time without protection, the matrix of the part will be corroded and dissolved quickly, forming corrosion pits, which will cause the part to be scrapped and unable to be repaired, resulting in a large amount of economic losses. Summary of the invention

[0004] In view of this, the utility model provides a electroplating deep blind hole protection tooling, which can protect the deep blind hole, thereby ensuring that the parts are not in contact with the electroplating solution during the copper electroplating process to prevent inner hole corrosion.

[0005] The technical solution adopted by the utility model is: a kind of electroplating deep blind hole protection tooling, characterized in that: it includes an embedding rod, an elastic plug and a steel screw; the embedding rod and the elastic plug are both columnar components; the total length of the embedding rod and the elastic plug is less than the length of the blind hole; the embedding rod and the silicone plug are coaxially connected by a steel screw; the embedding rod can be slidably installed in the interior of the blind hole, and a gap is left between the outer circumference of the embedding rod and the inner wall of the blind hole; the outer diameter of the silicone plug is adapted to the aperture of the corresponding blind hole.

[0006] Furthermore, the difference between the total length of the embedded rod and the elastic plug and the blind hole is less than the length of the inner diameter of the blind hole.

[0007] Furthermore, a steel gasket is provided between the steel screw and the elastic plug, and the diameter of the steel gasket is consistent with the outer diameter of the silicone plug.

[0008] Furthermore, the embedded rod is an aluminum rod.

[0009] Furthermore, the elastic plug is a silicone plug.

[0010] The beneficial effect of the utility model is that the parts equipped with the tooling are placed in the electroplating solution to seal the deep part of the blind hole. And because the air inside the blind hole is discharged by the embedded rod, the production accident caused by the ejection of the tooling due to the expansion of the air due to heat during the electroplating process is avoided. Under the protection of the tooling, the deep part of the blind hole is isolated from the corrosion of the electroplating solution, and the outer part of the part and the position near the hole of the blind hole are protected by electroplating, so that the part is effectively protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the parts to be protected by the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 3 It is an assembly diagram of the utility model and parts.

[0014] In the figure: 1. part, 2. blind hole, 3. bottom end, 4. hole opening, 5. aluminum rod, 6. threaded hole, 7. silicone plug, 8. through hole, 9. steel gasket, 10. steel screw. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] like Figure 1 As shown, the part 1 is a strip structure, and the axis of the part 1 has a blind hole 2, which is a stepped hole.

[0017] like Figure 2 and Figure 3 As shown, a electroplated deep blind hole protection tooling includes an embedding rod, an elastic plug and a steel screw 10. The embedding rod can be an aluminum rod 5, which can reduce the overall weight of the tooling. The elastic plug only needs to have elastic deformation ability. In this embodiment, the elastic plug is a silicone plug 7.

[0018] The total length of the aluminum rod 5 and the silicone plug 7 is less than the length of the blind hole 2. Since the purpose of the utility model is to protect the deep part of the blind hole 2 of the part 1 from being corroded by the solution, the overall length of the tooling does not have to be equal to the length of the blind hole 2. The difference between the length of the tooling and the blind hole 2 is less than the length of the inner diameter of the orifice 4 of the blind hole 2. The inner wall of the blind hole 2 near the orifice 4 can still obtain an electroplated protective layer.

[0019] The diameter of the aluminum rod 5 is adapted to the minimum aperture of the stepped hole, and is installed inside the blind hole 2 by sliding. The front end of the aluminum rod 5 is against the bottom end 3 of the blind hole 2. A threaded hole 6 is provided at the axis of the rear end of the aluminum rod 5, and a through hole 8 is provided at the center of the silicone plug 7. The steel screw 10 passes through the through hole 8 and the threaded hole 6 to coaxially fix the aluminum rod 5 and the silicone plug 7. The outer diameter of the silicone plug 7 is adapted to the aperture of the corresponding blind hole 2. The outer circumference of the silicone plug 7 is against the inner wall of the corresponding blind hole 2. Through the extrusion of the steel screw 10, the silicone plug 7 undergoes elastic deformation to seal the blind hole 2, thereby isolating the solution from entering the deep part of the blind hole 2.

[0020] by Figure 1 Taking the structure of part 1 as an example, the blind hole 2 of part 1 has the smallest aperture near the bottom 3, and then increases in diameter, and decreases near the opening 4. According to the shape of the blind hole 2, the aluminum rod 5 is also designed as a stepped shaft with matching shape. However, there is a gap between each stepped shaft and the corresponding stepped hole, such as Figure 3 As shown. This is because when the aluminum rod 5 is slidably fitted into the blind hole 2 of the part 1, it is necessary to ensure that the gas in the blind hole 2 can be discharged smoothly. Exhausting the gas can prevent the pressure generated by the gas expansion due to heat during the electroplating process, causing the tooling to pop out. The outer diameter of the silicone plug 7 is adapted to the aperture of the stepped hole at the plugging point. Because the silicone plug 7 is elastic, when the steel screw 10 is tightened to coaxially fix the aluminum rod 5, the silicone plug 7 can be squeezed and elastically deformed, thereby playing a plugging role.

[0021] In order to prevent the silicone plug 7 from being damaged by the through hole 8 due to the tightening and extrusion of the steel screw 10, a steel gasket 9 is installed between the steel screw 10 and the silicone plug 7. The diameter of the steel gasket 9 is consistent with the outer diameter of the silicone plug 7.

[0022] When the utility model is in use, the aluminum rod 5, the silicone plug 7 and the steel gasket 9 are coaxially connected by the steel screw 10, and the silicone plug 7 is not squeezed and deformed at this time. Then the aluminum rod 5 is slidably fitted into the blind hole 2 of the part 1 until the front end of the aluminum rod 5 abuts against the bottom end 3 of the blind hole 2. The air is squeezed out of the blind hole 2 by the aluminum rod 5. At this time, tighten the steel screw 10 to make the silicone plug 7 elastically deformed by squeezing to seal the blind hole 2. The part 1 equipped with the tooling is placed in the electroplating solution, so that the outside of the part 1 and the unblocked part of the blind hole 2 can obtain a protective layer. The deep part of the blind hole 2 blocked by the tooling is isolated from contact with the electroplating solution, so as to avoid corrosion of the substrate, thereby protecting the entire part 1.

Claims

1. A electroplating deep blind hole protection tooling, characterized in that: It includes an embedding rod, an elastic plug and a steel screw; the embedding rod and the elastic plug are both columnar components; the total length of the embedding rod and the elastic plug is less than the length of the blind hole; the embedding rod and the silicone plug are coaxially connected by a steel screw; the embedding rod can be slidably installed inside the blind hole, and a gap is left between the outer circumference of the embedding rod and the inner wall of the blind hole; the outer diameter of the silicone plug is adapted to the aperture of the corresponding blind hole.

2. The electroplating deep blind hole protection tooling according to claim 1, characterized in that: The difference between the total length of the embedded rod and the elastic plug and the blind hole is less than the length of the inner diameter of the blind hole.

3. The electroplating deep blind hole protection tooling according to claim 1, characterized in that: A steel gasket is also provided between the steel screw and the elastic plug, and the diameter of the steel gasket is consistent with the outer diameter of the silicone plug.

4. The electroplating deep blind hole protection tooling according to claim 1, characterized in that: The embedded rod is an aluminum rod.

5. The electroplating deep blind hole protection tooling according to claim 1, characterized in that: The elastic plug is a silicone plug.

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