CN114855252A

CN114855252A - Blind hole chromium plating device

Info

Publication number: CN114855252A
Application number: CN202210725140.XA
Authority: CN
Inventors: 宗洋洋; 谢红涛; 黄枝柄; 芦文国; 熊诵涛
Original assignee: AVIC Landing Gear Advanced Manufacturing Corp
Current assignee: AVIC Landing Gear Advanced Manufacturing Corp
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-08-05

Abstract

The invention discloses a blind hole chromium plating device, wherein a workpiece is provided with a blind hole, and an anode rod is arranged in the blind hole. The invention changes the distribution of the electric density lines on the electroplating surface of the workpiece, ensures that the thickness of the blind hole coating is uniform and controllable, has convenient and simple installation and strong practicability, and has important significance for cost reduction and efficiency improvement.

Description

Blind hole chromium plating device

Technical Field

The invention relates to a blind hole chromium plating device, belonging to the technical field of chromium plating process devices.

Background

The hard chromium plating layer has high hardness and excellent wear resistance, and after the hard chromium layer is plated on the surface of a workpiece, the service life of the hard chromium plating layer can be greatly prolonged, so that the hard chromium plating layer is widely applied to the mechanical manufacturing industry.

The requirement of the chromium plating of the inner hole on the tool is high, the tool is correctly designed, manufactured, used and maintained, the electroplating quality and the production efficiency can be improved, and the method has great significance in energy conservation and consumption reduction. However, when a workpiece with a special structure, particularly a deep blind hole, is subjected to chromium plating, because the solution at the bottom cannot circulate, a large amount of gas overflows from bottom to top, and occupies the volume of the solution, the concentration of the solution above the workpiece is reduced, the deposition rate of the chromium layer is reduced, and the plating layer of the blind hole is thinner upwards, so that the blind hole plating layer with a thin top and a thick bottom is finally formed. Because the chromium layer has high hardness, the conical surface is difficult to eliminate during machining, and even the phenomenon that the local coating cannot be machined and the coatings at other parts are worn out can occur, thereby bringing great difficulty to subsequent machining and greatly increasing the production cost. The process requirements cannot be met by using the traditional electroplating device.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention provides a blind hole chromium plating device, so that a uniform and consistent qualified plating layer can be obtained by blind holes.

The utility model provides a blind hole chromium plating device, the work piece has the blind hole, be provided with the anode rod in the blind hole, its characterized in that, the anode rod is fixed a position on the central axis of blind hole, just the anode rod is located part in the blind hole has the conical surface, the anode rod is close to the diameter of the one end of blind hole bottom is less than the anode rod is located the diameter of blind hole opening part.

By adopting the technical scheme, the anode rod with the conical surface can change the electric density line on the surface of the blind hole of the workpiece, so that the problem of uneven thickness of the chromium plating layer of the blind hole in the prior art is solved, the blind hole obtains an even and consistent plating layer, the electroplating efficiency of the workpiece is improved, and the production cost is saved.

Furthermore, the blind hole chromium plating device also comprises a first gasket, wherein the first gasket is made of insulating materials, the first gasket is arranged at the bottom of the blind hole, and the first gasket is provided with a central groove for accommodating the end part of the anode rod. The first gasket is favorable for keeping the anode rod on the central axis of the blind hole, and the anode rod is prevented from shaking. Preferably, the first gasket is made of polytetrafluoroethylene or plexiglass.

Further, the blind hole chromium plating device further comprises a lining, the lining comprises a second gasket and a sleeve, the second gasket is provided with a central through hole, the second gasket is sleeved on the anode rod, and the sleeve is sleeved on the outer surface of the workpiece. The bush is favorable to keeping the positive pole to be located the central axis of blind hole, prevents that the positive pole from taking place to rock. Preferably, the lining is made of polytetrafluoroethylene or organic glass. Preferably, the second gasket is provided with a plurality of drain holes surrounding the central through hole.

Furthermore, the blind hole chromium plating device also comprises a gasket, one side of the gasket abuts against the end face of the workpiece, the other side of the gasket abuts against the second gasket, the inner surface of the gasket is aligned with the inner surface of the blind hole, and the gasket is made of metal materials. The gasket is favorable for improving the quality of the plating layer at the opening position of the blind hole.

The blind hole chromium plating device can achieve the following beneficial effects:

1. the electroplating qualification rate of the blind holes can reach 100 percent, and the plated appearance has uniform, smooth, compact and burr-free color;

2. the thickness uniformity can be controlled within +/-5 percent, and the edges have no coarse crystallization phenomena such as burrs and the like;

3. the invention is easy to learn and understand, convenient to install and disassemble and beautiful and simple in appearance.

Drawings

FIG. 1 is a schematic view of the state of use of the blind chromium plating device of the present invention;

FIG. 2 is a schematic view of the blind chromium plating device of the present invention;

FIG. 3 is a schematic illustration of a workpiece having a blind hole;

FIG. 4 is a schematic cross-sectional view of a first shim;

FIG. 5 is a front view of the bushing;

fig. 6 is a schematic cross-sectional view of a bushing.

In the figure: the anode rod comprises an anode rod 1, a first gasket 2, a central groove 2.1, a gasket 3, a lining 4, a second gasket 4.1, a sleeve 4.2, a central through hole 4.3, a liquid discharge hole 4.4, a conductive belt 5, a workpiece 6 and a blind hole 6.1.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Referring to fig. 1-6, a blind hole chromium plating device, a workpiece 6 has a blind hole 6.1, an anode rod 1 is arranged in the blind hole 6.1, the anode rod 1 is positioned on the central axis of the blind hole 6.1, the part of the anode rod 1 positioned in the blind hole 6.1 has a conical surface, and the diameter of one end of the anode rod 1 close to the bottom of the blind hole 6.1 is smaller than the diameter of the anode rod 1 positioned at the opening of the blind hole 6.1.

There are various ways of positioning the anode rod 1 in the blind hole, and in this embodiment, the first gasket 2 and the bushing 4 are adopted, it should be noted that those skilled in the art can also position the anode rod 1 in other ways.

As shown in fig. 1 and 2, the anode rod 1 mainly comprises a conical section and a cylindrical section, wherein the conical section is located in the blind hole, the cylindrical section is located outside the blind hole, and the cylindrical section is beneficial to installation of the bushing 4 and other accessories. The anode rod 1 is an important component of an inner hole chromium plating tool, the traditional chromium plating anode adopts the anode rod with the same vertical size, but due to the particularity of a blind hole structure, a bottom solution cannot circulate during chromium plating, generated gas can be discharged from bottom to top only, bubbles occupy the volume of the solution above the blind hole structure, so that the concentration of the solution is reduced, the deposition rate of a chromium layer is reduced finally, and the phenomenon of lower thickness and upper thickness is formed. Aiming at the situation, the conical anode rod is designed, the upper part is thick, the lower part is thin, the distribution of the electric density lines is changed, and the consistency of the deposition rate of the chromium layer is ensured. Tests show that the deposition rate of the chromium layer is accelerated along with the increase of dense lines, the hole anode is thick, the distance between a workpiece and the anode is short, electric lines of force on the surface of the workpiece are dense, and the deposition rate of the chromium layer is high; and the anode at the bottom is extremely fine, the distance between the workpiece and the anode is long, the electric lines on the surface of the workpiece are sparse, and the deposition rate is low. Thus, the deposition rate in the whole blind hole can be balanced, and a uniform coating can be obtained.

As shown in fig. 2 and 4, when the blind hole is plated with chrome, the anode rod 1 needs to be clamped on the central axis of the blind hole, so that the surface of the workpiece can obtain a uniform electric density line. Because there is gas to produce in the solution among the chromium plating process, at the in-process that gas spills over, can let solution produce and roll, the positive pole takes place to rock, and positive pole position shift can influence whole cladding material quality, and what is more, can make the work piece produce the electric shock and hinder, causes serious consequence. The blind hole chromium plating device further comprises a first gasket 2, the first gasket 2 is made of insulating materials, the first gasket 2 is installed at the bottom of the blind hole 6.1, and the first gasket 2 is provided with a central groove 2.1 used for containing the end part of the anode rod 1. The bottom of the blind hole 6.1 is fixed by the first gasket 2 and the anode rod 1, so that the anode rod 1 can be ensured to be positioned at the central position during clamping, the workpiece can be prevented from shaking in the electroplating process, and the electroplating effect is ensured. Meanwhile, the bottom of the blind hole is a non-chrome-plated surface, so that the first gasket 2 can also play a role in protection. Since the anode rod 1 is made of a conductive material, the first gasket 2 is made of an insulator made of teflon or organic glass.

As shown in fig. 1, 5 and 6, the blind hole chromium plating device further comprises a bushing 4, the bushing 4 comprises a second gasket 4.1 and a sleeve 4.2, the second gasket 4.1 is provided with a central through hole 4.3, the second gasket 2.1 is sleeved on the anode rod 1, and the sleeve 4.2 is sleeved on the outer surface of the workpiece 6. The bush 4 acts like the first gasket 2, and ensures that the anode rod 1 is concentric with a workpiece all the time in the electroplating process and does not shake. Preferably, the lining 4 is made of teflon or plexiglass. The second gasket 4.1 is provided with a number of drainage holes 4.4 surrounding the central through hole 4.3.

As shown in fig. 1 and 2, the blind hole chromium plating device further comprises a washer 3, one side of the washer 3 abuts against the end surface of the workpiece 6, the other side abuts against the second gasket 4.1, the outer surface of the washer 3 is matched with the inner surface of the sleeve 4.2, the inner surface of the washer 3 is aligned with the inner surface of the blind hole 6.1, and the washer 3 is made of a metal material. During the electroplating process, it was found that gas build-up easily occurs at the orifice edge locations, forming "air pocket" areas, which are either thinner or non-plated due to the lower solution concentration in these areas. In order to ensure the thickness of the plating layer of the hole opening, a gasket 3 with the same hole diameter as the blind hole is added, and the air bag position is extended onto the gasket 3, so that the electroplating quality of the opening position of the blind hole 6.1 is ensured.

The conductive band 5 illustrated in fig. 1 is a general hanger for an electroplating process, and is not described in detail, and may be welded to the anode rod 1.

In addition, the positioning of the bush 4 can be carried out by conventional means, such as by means of a nut or the like mounted on the anode rod 1.

The embodiments of the present invention are described above with reference to the drawings, and the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a blind hole chromium plating device, work piece (6) have blind hole (6.1), be provided with anode bar (1) in blind hole (6.1), its characterized in that, anode bar (1) are fixed a position on the central axis of blind hole (6.1), just anode bar (1) are located part in blind hole (6.1) has the conical surface, anode bar (1) are close to the diameter of the one end of blind hole (6.1) bottom is less than anode bar (1) is located the diameter of blind hole (6.1) opening part.

2. Blind hole chromium plating device according to claim 1, characterized in that it further comprises a first gasket (2), said first gasket (2) being made of insulating material, said first gasket (2) being mounted at the bottom of said blind hole (6.1), said first gasket (2) having a central recess (2.1) for receiving the end of said anode rod (1).

3. Blind hole chromium plating device according to claim 2, characterized in that said first gasket (2) is made of teflon or perspex.

4. The blind hole chromium plating device according to claim 1, characterized in that the blind hole chromium plating device further comprises a bushing (4), the bushing (4) comprises a second gasket (4.1) and a sleeve (4.2), the second gasket (4.1) has a central through hole (4.3), the second gasket (4.1) is sleeved on the anode rod (1), and the sleeve (4.2) is sleeved on the outer surface of the workpiece (6).

5. Blind hole chromium plating device according to claim 4, characterized in that said bushing (4) is made of Teflon or plexiglass.

6. Blind hole chromium plating device according to claim 4, characterized in that said second gasket (4.1) is provided with a plurality of drainage holes (4.4) surrounding said central through hole (4.3).

7. A blind hole chromium plating device according to claim 4 characterized in that it also comprises a washer (3), said washer (3) being in abutment on one side against the end face of said workpiece (6) and on the other side against said second washer (4.1), the inner surface of said washer (3) being aligned with the inner surface of said blind hole (6.1), said washer (3) being made of a metallic material.