CN219059159U

CN219059159U - Micro-arc oxidation functional area protection clamp of cylindrical inner cavity structure

Info

Publication number: CN219059159U
Application number: CN202223198854.4U
Authority: CN
Inventors: 殷强; 黄威; 王媛媛; 王小龙; 王浩伟; 何卫平; 韦利军; 刘元海
Original assignee: China Special Vehicle Research Institute
Current assignee: China Special Vehicle Research Institute
Priority date: 2022-11-27
Filing date: 2022-11-27
Publication date: 2023-05-23
Anticipated expiration: 2032-11-27

Abstract

The utility model relates to a protective clamp for a micro-arc oxidation functional area of a cylindrical inner cavity structure, which comprises a conductive nut, a thread protector and a bottom cushion block, wherein the bottom cushion block is sleeved on an upper end shaft section of a structural member of the cylindrical inner cavity to be processed; the thread protector is screwed into a thread section to be processed at the upper end of the structural member of the cylindrical inner cavity, and the lower end face of the thread protector is attached to the upper end face of the bottom cushion block; the conductive thread is screwed into the thread protector until the lower end of the conductive nut is contacted with the end face of the upper end of the tubular inner cavity structural member to be processed. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure, which is designed by the utility model, can be used for batch micro-arc oxidation production treatment, the quality of the film layer at the oxidation part is good, the upper end protective area is free from any oxidation, and the junction part is free from obvious burn marks. The fixture has the characteristics of good protection effect, convenience in disassembly, reusability of the protection fixture, production efficiency improvement, cost saving and the like.

Description

Micro-arc oxidation functional area protection clamp of cylindrical inner cavity structure

Technical Field

The utility model belongs to the technical field of light metal surface treatment, and particularly relates to a protective clamp for a micro-arc oxidation functional area of a cylindrical inner cavity structure.

Background

The micro-arc oxidation technology is a new technology for directly growing ceramic film on the surface of light metal in situ, and its principle is that valve metals of aluminium, magnesium, titanium and the like or their alloys are placed in electrolyte under the electric field environment as anode, electrolytic tank as cathode, and high voltage and high current are applied to produce spark discharge spots on the surface of material, and under the combined action of thermochemistry, plasma chemistry and electrochemistry, a surface modification technology of metal oxide ceramic film is obtained. As an emerging, environment-friendly, efficient and energy-saving surface treatment technology, the micro-arc oxidation technology is applied to various fields of production and life, such as the modern industrial fields of aviation, aerospace, ships, automobiles, weapons, light industrial machinery, petrochemical industry, instruments, medical health and the like, because the prepared ceramic coating has the advantages of high strength, wear resistance, corrosion resistance, electric insulation and the like. Conventionally, 7075 aluminum alloy has been a popular aluminum alloy for use as various load bearing members in aviation aircraft due to its high strength, high hardness, good weldability, etc. However, the corrosion resistance is very poor, and corrosion is very easy to occur in severe environments such as high temperature, damp heat, salt fog and the like, so that safety accidents are generated. In the field of aviation, higher requirements (acidic salt mist 192h and local micro-arc oxidation) are put forward on the corrosion resistance of 7075 aluminum alloy, the conventional anodic oxidation process treatment cannot meet the requirements, and the 7075 aluminum alloy treated by the micro-arc oxidation technology can obviously improve the corrosion resistance.

The cylindrical inner cavity structural member of an aircraft is formed by 7075 aluminum alloy, the whole protection of the threaded part at the upper end and the micro-arc oxidation of the rest parts are required, and the upper end structure of the cylindrical inner cavity structural member is complex and comprises a threaded section, a shaft section and an annular boss; in the micro-arc oxidation treatment process, the whole upper end structure needs to be protected; after oxidation, no obvious corrosion is caused by acid salt fog for 192 hours. The traditional method is that a large amount of sealant is uniformly smeared on the upper thread protection part and clamped by a clamp to be placed in electrolyte, and obvious clamping point marks are left on the surface of a tubular inner cavity structural member due to contact points, so that the appearance is seriously affected, a large amount of sealant is wasted in the process, and the production cost is increased.

Disclosure of Invention

The purpose of the utility model is that: aiming at the difficulty of local protection of the tubular inner cavity structural member, the micro-arc oxidation functional area protection clamp of the tubular inner cavity structure is developed, and the micro-arc oxidation functional area protection clamp has the characteristics of convenience in assembly and disassembly, complete appearance, low manufacturing cost, greenness, high efficiency, reusability, good protection effect and the like.

The technical scheme is as follows: the protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure comprises a conductive nut, a thread protector and a bottom cushion block, wherein the bottom cushion block is sleeved on the upper end shaft section of a structural member of the cylindrical inner cavity to be processed; the thread protector is screwed into a thread section to be processed at the upper end of the structural member of the cylindrical inner cavity, and the lower end face of the thread protector is attached to the upper end face of the bottom cushion block; the conductive thread is screwed into the thread protector until the lower end of the conductive nut is contacted with the end face of the upper end of the tubular inner cavity structural member to be processed.

Further, the periphery of the joint of the thread protector and the bottom cushion block is wrapped with the insulating tape so as to further seal the gap between the thread protector and the bottom cushion block.

Furthermore, the thread protector and the bottom cushion block are all made of nonmetallic insulating materials.

Further, the thread protector and the bottom pad are made of polyvinyl chloride.

Further, the conductive nut is made of LY12 aluminum alloy.

Further, the upper end of the conductive nut is also provided with a boss which is convenient to screw.

Further, a screw hole is formed in the center of the boss, and a conductive gasket electrified with the conductive nut is fixed by being matched with a tightening screw.

Furthermore, a plurality of small grooves are formed in the periphery of the thread protector, so that the thread protector is convenient to assemble.

In the utility model, the conductive nut is used as a conductive part and a fixture clamping point, and the thread protector and the bottom cushion block play an insulating protection role. The conductive nut is made of LY12 aluminum alloy, the thread of the conductive nut is matched with the thread protector, the conductive nut is in contact with the upper end surface of the tubular inner cavity structural member for conducting electricity after being screwed in, electrolyte is not contained at the contact point, and no trace is generated. The thread protector and the bottom cushion block are made of polyvinyl chloride, the texture is softer, the workpiece and the film layer are not damaged in the loading and unloading process, the tightness and the heat resistance are strong, and the isolation protection effect can be effectively achieved in the instant high-temperature electrolyte environment. The protective clamp consists of three thread fastening structures, and the whole protective clamp can be fastened and clamped by externally applying clockwise rotation force, so that the loosening and ablation in the oxidation process are avoided. After the oxidation is finished, the anti-clockwise force can be detached by a single person, so that the production efficiency is greatly improved, the protective clamp can be reused, and the production cost is saved.

The beneficial technical effects are as follows: the protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure, which is designed by the utility model, can be used for batch micro-arc oxidation production treatment, the quality of the film layer at the oxidation part is good, the upper end protective area is free from any oxidation, and the junction part is free from obvious burn marks. The fixture has the characteristics of good protection effect, convenience in disassembly, reusability of the protection fixture, production efficiency improvement, cost saving and the like.

Drawings

FIG. 1 is a cross-sectional view of the overall structure of the present utility model;

FIG. 2 is a three-dimensional block diagram of the present utility model;

FIG. 3 is a schematic view of a conductive nut;

FIG. 4 is a schematic view of a bottom pad structure;

wherein, the nut is 1-conductive, the 2-thread protector, the pad at the bottom is 3-and the pad is 1 a-conductive; 3 a-step through holes, 3 b-straight sections.

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. In the description of the present utility model, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

The utility model aims to realize micro-arc oxidation of a local area of a tubular inner cavity structural member, and particularly relates to a protective clamp for a micro-arc oxidation functional area of a tubular inner cavity structure.

In order to solve the following technical problems: as shown in fig. 1, the whole upper thread part of the tubular inner cavity structural member is protected from oxidation, and the other parts are subjected to micro-arc oxidation; the contact point of the clamp and the workpiece is not easy to be obvious, and the appearance of the film is affected; the micro-arc oxidation process needs to be integrally clamped and fastened, otherwise, the electric heating ablation phenomenon occurs due to loosening; the fixture is convenient to detach, does not damage the workpiece, and improves the production efficiency; and whether the tool clamp can be reused or not, so that the cost is reduced.

1) The protective clamp is detachably arranged at three parts of the conductive nut 1, the thread protector 2 and the bottom cushion block 3, wherein the conductive nut 1 is used as a conductive part and a fixture clamping point, and the thread protector 2 and the bottom cushion block 3 play an insulating protection role.

2) The conductive nut 1 is made of LY12 aluminum alloy, the thread of the conductive nut is matched with the thread protector 2, the conductive nut is in contact with the upper end surface of the tubular inner cavity structural member for conducting electricity after being screwed in, and no electrolyte exists at the contact point position, so that no trace is generated.

3) The thread protector 2 and the bottom cushion block 3 are made of polyvinyl chloride, the texture is softer, the workpiece and the film layer are not damaged in the loading and unloading process, the tightness and the heat resistance are strong, and the isolation protection effect can be effectively achieved in the instant high-temperature electrolyte environment.

4) The protective clamp consists of three thread fastening structures, and the whole protective clamp can be fastened and clamped by externally applying clockwise rotation force, so that the loosening and ablation in the oxidation process are avoided.

5) After the oxidation is finished, the anti-clockwise force can be detached by a single person, so that the production efficiency is greatly improved, the protective clamp can be reused, and the production cost is saved.

The detachable protective clamp for three parts of the conductive nut 1, the thread protector 2 and the bottom cushion block 3 is processed according to the earlier design, wherein the conductive nut is made of LY12 aluminum alloy, the thread of the conductive nut is matched with the thread protector, and the conductive nut is contacted with the upper end surface of the tubular inner cavity structural member for conducting after being screwed in. The thread protector and the bottom cushion block are made of polyvinyl chloride, the texture is softer, the workpiece and the film layer are not damaged in the loading and unloading process, the tightness and the heat resistance are strong, and the isolation protection effect can be effectively achieved in the instant high-temperature electrolyte environment. For a specific cylindrical inner cavity structural member to be processed, a step through hole 3a can be formed in the middle of the bottom cushion block 3, the lowest step is matched with an annular boss of the cylindrical inner cavity structural member to be processed, of course, in a certain model which can be designed adaptively, a flat section is formed on the side face of the annular boss, and a flat section 3b is also arranged on the end face of the corresponding lowest step hole. The upper end of the conductive nut 1 can be connected with a conductive gasket 1a.

Clamping: the bottom cushion block, the thread protector and the conductive nut are sequentially arranged on the structural member of the cylindrical inner cavity, and the whole body can be fastened and clamped by externally applying clockwise rotation force, so that the loosening and ablation in the oxidation process are avoided. The surface of the workpiece cannot be damaged in the fastening process, whether the whole fixture is fastened and connected is strictly checked, any joint cannot be loosened, when the workpiece is clamped on the anode, the surface of the main body is opposite to the cathode plate,

the disassembly is the reverse process of the clamping process, and the counter-clockwise force disassembly is carried out, so that the conductive nut, the thread protector and the bottom cushion block are taken down; the formed micro-arc oxidation film layer cannot be damaged in the disassembling process, soft materials or bubble films are used for wrapping the disassembling tool when necessary, and the clamp is placed in a classified mode so as to be reused.

By adopting the protective tooling provided by the utility model, the micro-arc oxidation film with good appearance is obtained, and the oxidation area film layer is uniform, defect-free and gray in color. The upper port protection area has no any oxide layer, the body aluminum alloy is not damaged, the junction of the oxide film and the protection layer has no obvious burn mark, and the overall effect is good. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure can be used for batch micro-arc oxidation production treatment, the film layer of the oxidation part has good quality, the upper end protective area is free from any oxidation, and the joint of the workpiece and the conductive nut is free from obvious burn marks. The fixture has the characteristics of good protection effect, convenience in disassembly, reusability of the protection fixture, production efficiency improvement, cost saving and the like.

The method is suitable for partial micro-arc oxidation treatment of the tubular inner cavity structural member. The advantages are concentrated in that:

(1) The device consists of three parts, namely a conductive nut, a thread protector and a bottom cushion block, and has a simple and effective structure;

(2) The contact point of the aluminum alloy conductive nut and the workpiece has no obvious trace and no appearance defect;

(3) The polyvinyl chloride thread protector and the bottom cushion block do not damage the workpiece and the film layer, and the protection effect is good;

(4) The whole body can be fastened by clockwise torsion, so that ablation is avoided;

(5) The disassembly is convenient, the protective clamp can be reused, the production efficiency is improved, and the cost is saved.

The above detailed description or examples are only for illustrating the technical scheme of the present utility model, and are not limiting, and the detailed description is not to be taken as conventional technical means or common general knowledge in the art; those of ordinary skill in the art will appreciate that: based on the design concept of the present application, the technical solutions described in the foregoing embodiments should be adaptively modified, or some or all of the technical features thereof may be equivalently replaced, where these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure is characterized by comprising a conductive nut, a thread protector and a bottom cushion block, wherein the bottom cushion block is sleeved on the upper end shaft section of a structural member of the cylindrical inner cavity to be processed; the thread protector is screwed into a thread section to be processed at the upper end of the structural member of the cylindrical inner cavity, and the lower end face of the thread protector is attached to the upper end face of the bottom cushion block; the conductive thread is screwed into the thread protector until the lower end of the conductive nut is contacted with the end face of the upper end of the tubular inner cavity structural member to be processed.

2. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure according to claim 1, wherein the thread protector and the bottom cushion block are made of nonmetallic insulating materials.

3. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure according to claim 2, wherein the thread protector and the bottom cushion block are made of polyvinyl chloride.

4. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure according to claim 1, wherein the periphery of the joint of the thread protector and the bottom cushion block is wrapped with a protective tape.

5. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure according to claim 1 or 4, wherein a boss which is convenient to screw is further arranged at the upper end of the conductive nut.

6. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure according to claim 5, wherein a screw hole is formed in the center of the boss, and a conductive gasket electrified with the conductive nut is fixed by being matched with the screw.

7. The protective clamp for the micro-arc oxidation functional area of the cylindrical inner cavity structure according to claim 1, wherein a plurality of small grooves are formed in the periphery of the thread protector, so that the assembly is facilitated.