Reinforcing method of carbon steel electric power connection fitting

Abstract

The invention relates to the technical field of electric power connection fittings, and discloses a strengthening method of a carbon steel electric power connection fitting. The method comprises the steps that an alcohol-based aluminum oxide coating is brushed on a non-strengthened area of the carbon steel fitting, and the strengthened area comprises an inner cavity of the carbon steel fitting or an easy-to-wear area of part of the outer surface of the carbon steel fitting; the carbon steel fitting coated with the alcohol-based aluminum oxide coating is subjected to carbonitriding machining, and a nitriding layer and a carbonization layer are generated in the strengthened area; and carrying out sand blasting treatment on the carbon steel fitting subjected to carbonitriding treatment so as to remove the alcohol-based aluminum oxide coating in a non-strengthened area, and carrying out tin plating treatment on the carbon steel fitting. According to the invention, the hardness and wear resistance of the fitting are improved, so that the service life of the connecting fitting is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric power connection fittings, and in particular to a method for strengthening carbon steel electric power connection fittings. Background Art

[0002] Hardware is a metal accessory that connects and combines various devices in the power system and is widely used in industrial transmission lines. Among them, connecting hardware is a hardware that connects insulators, suspension clamps, tension clamps and protective hardware into a suspension or tension string. It mainly plays the role of fixing and connecting devices in the operation of the power system. Among them, connecting hardware such as hanging plates, connecting plates and hanging rings are operated in a non-fixed connection form of bolt fixing or plug-in installation. There are no special requirements for conductivity, but there are certain requirements for mechanical properties and wear resistance. In addition, this non-fixed connection form needs to withstand the shaking and friction caused by strong winds and other climates, and the gap between the connection surfaces is easy to enter sand and dust, which will increase wear. Therefore, many connecting hardware will suffer severe wear in windy and sandy weather, making wear and failure the main reason for the replacement of power connecting hardware.

[0003] Power connection fittings are generally made of carbon steel materials with good economy, high hardness and high strength. In areas with windy and sandy climates, the service life of carbon steel fittings is short, the line maintenance frequency is high, and the maintenance cost of the power system is high. Therefore, improving the wear resistance of the existing carbon steel connection fittings in the easily worn areas can extend the service life of the fittings, reduce operation and maintenance costs, and help save energy and reduce emissions. Summary of the invention

[0004] In view of the above situation, an embodiment of the present application provides a method for strengthening carbon steel power connection fittings, aiming to solve the above problem or at least partially solve the above problem.

[0005] In the first aspect, an embodiment of the present application provides a method for strengthening a carbon steel power connection fitting, the method comprising: applying an alcohol-based aluminum oxide coating on a non-reinforced area of ​​the carbon steel fitting, the reinforced area including an easily worn area of ​​an inner cavity or an outer surface of the carbon steel fitting; performing carbonitriding processing on the carbon steel fitting coated with the alcohol-based aluminum oxide coating to generate a nitride layer and a carbide layer in the reinforced area; sandblasting the carbon steel fitting after the carbonitriding processing to remove the alcohol-based aluminum oxide coating in the non-reinforced area, and tinning the carbon steel fitting.

[0006] In some embodiments of the present application, after applying the alcohol-based aluminum oxide coating on the non-reinforced area of ​​the carbon steel hardware, the method further includes: spraying alcohol on the carbon steel hardware, and performing drying and preheating treatment.

[0007] In some embodiments of the present application, the carbonitriding process includes the following process: heating to 515-550°C under a vacuum below 1.5 mbar, introducing nitrogen during the heating process, and entering a heat preservation stage; during the heat preservation stage, introducing alcohol vapor to form carbonitriding with nitrogen.

[0008] In some embodiments of the present application, during the insulation stage, nitrogen and alcohol vapor are replaced 12-15 times per hour, the ratio of alcohol vapor to ammonia is 0.1:1-0.3:1, and the insulation time is 1.5-2 hours.

[0009] In some embodiments of the present application, the thickness of the nitrided layer and the carburized layer after carbonitriding is 20-30 μm, and the hardness is greater than 600 HV0.2.

[0010] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: by using alcohol-based aluminum oxide coating to protect the non-reinforced area, to replace the tin-plated protective layer in the carbonitriding process, the aluminum oxide protective layer can be removed by sandblasting, which is less difficult and time-consuming than the removal of the tin-plated layer, and the surface quality of the hardware after removal is better. By adopting the carbonitriding strengthening method for the reinforced area, a nitride layer and a carbide layer can be generated in the easily worn area of ​​the connecting hardware of the non-fixed connection, so as to achieve an increase in hardness and wear resistance, thereby increasing the life of the connecting hardware. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0012] Figure 1 A schematic flow chart of a method for strengthening carbon steel power connection fittings provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0014] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such use is interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to".

[0015] As described in the background technology, power connection fittings are generally made of carbon steel materials with good economy, high hardness and high strength. In areas with windy and sandy climates, the service life of carbon steel fittings is short, the line maintenance frequency is high, and the maintenance cost of the power system is high. Therefore, improving the wear resistance of the easily worn areas of existing carbon steel connection fittings can extend the service life of the fittings, reduce operation and maintenance costs, and be beneficial to energy conservation and emission reduction. Among the local strengthening methods in the related art, the laser cladding and plasma cladding methods of the alloy layer have the disadvantage of being unable to strengthen the inner cavity and screw hole areas, while the existing carburizing and nitriding processes require tin plating, carburizing / nitriding, removal of the tin plating layer, surface smoothing and tin plating, which are lengthy and complicated processes.

[0016] Based on this, the present application proposes a method for strengthening carbon steel power connection fittings, which uses alcohol-based aluminum oxide coating to protect the non-strengthened area to replace the protection of the tin plating layer. The protective layer can be removed by sandblasting, which is less difficult than removing the tin plating layer, and the surface quality of the fittings after removal is better. Through the strengthening method of local carbonitriding, nitride layers and carbide layers can be planted in the easily worn areas of the non-fixed connection fittings to achieve increased hardness and wear resistance, thereby increasing the life of the connection fittings.

[0017] Figure 1 The schematic diagram of the process of strengthening the carbon steel power connection fittings provided in the embodiment of the present application is shown. Figure 1 It can be seen that the present application at least includes steps S101 to S103:

[0018] Step S101: applying an alcohol-based aluminum oxide coating to a non-reinforced area of ​​a carbon steel fitting.

[0019] The reinforced area includes the easily worn area of ​​the inner cavity or outer surface of the carbon steel hardware. The non-reinforced area is the easily worn area other than the inner cavity or outer surface of the carbon steel hardware. The easily worn area can be the part of the hardware that is not fixedly connected. Of course, the easily worn area can be determined by the technicians.

[0020] Step S102: performing carbonitriding processing on the carbon steel hardware coated with the alcohol-based aluminum oxide coating to generate a nitride layer and a carbide layer in the strengthening area.

[0021] In some embodiments, a carbon steel fitting is placed on a cathode plate of a glow ion low-temperature carbonitriding device for carbonitriding.

[0022] Step S103: sandblasting the carbon steel fittings after carbonitriding to remove the alcohol-based aluminum oxide coating in the non-strengthened area, and tinning the carbon steel fittings.

[0023] In this step, sandblasting uses compressed air as a power source to spray abrasives onto the work surface at high speed, without the need for complex chemical formulas or precise temperature control. In the related art, the removal of tin-plated layers usually involves chemical treatment, involving chemical formulas and precise temperature control. Therefore, the present application adopts an alcohol-based aluminum oxide coating, which can be removed by sandblasting, saving strengthening time and reducing the cost of removing the coating.

[0024] After the carbonitriding hardware is sandblasted, the entire hardware is tinned to improve the corrosion resistance and aesthetics of the carbon steel hardware surface and the carbonitriding surface, further enhance its performance and extend its service life.

[0025] from Figure 1 It can be seen from the method shown that the present application uses an alcohol-based aluminum oxide coating to protect the non-reinforced area to replace the protection of the tin-plated protective layer in the carbonitriding process. The aluminum oxide protective layer can be removed by sandblasting, which is less difficult than removing the tin-plated layer, and the surface quality of the hardware after removal is better. Through the local carbonitriding strengthening method, the nitride layer and the carbide layer can be planted in the easily worn area of ​​the non-fixed connection hardware, so as to improve the hardness and wear resistance, thereby increasing the life of the connection hardware.

[0026] In some embodiments of the present application, in the above method, after the alcohol-based aluminum oxide coating is applied to the non-reinforced area of ​​the carbon steel hardware, the carbon steel hardware is sprayed with alcohol and dried and preheated.

[0027] In some embodiments of the present application, in the above method, the carbonitriding process includes the following process: heating to 515-550°C under a vacuum below 1.5 mbar, introducing nitrogen during the heating process, and entering a heat preservation stage; in the heat preservation stage, introducing alcohol vapor to form carbonitriding with nitrogen.

[0028] In some embodiments, the alcohol vapor is acetone vapor or acetylene vapor.

[0029] In some embodiments, during the insulation stage, nitrogen and alcohol vapor are replaced 12-15 times per hour, the ratio of alcohol vapor to ammonia is 0.1:1-0.3:1, and the insulation time is 1.5-2 hours.

[0030] In some embodiments of the present application, the thickness of the nitride layer and the carbide layer of the carbon steel hardware after carbonitriding is 20-30 μm, the hardness is greater than 600HV0.2, the wear resistance of the area after carbonitriding strengthening is significantly improved, and the service life is increased.

[0031] In summary, the method for strengthening carbon steel power connection fittings proposed in the embodiment of the present application improves the problems of severe wear and insufficient life of existing power connection fittings in windy and sandy environments, improves the wear resistance of easily worn areas of the power connection fittings, and reduces the maintenance cost of the fittings.

[0032] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, commodity or device including the element.

[0033] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0034] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for strengthening carbon steel power connection fittings, characterized in that: The method comprises: Apply alcohol-based aluminum oxide coating to non-reinforced areas of carbon steel hardware, wherein the reinforced areas include the inner cavity or the easily-worn areas on the outer surface of the carbon steel hardware; Carbonitriding is performed on carbon steel fittings coated with alcohol-based aluminum oxide to generate nitride and carbide layers in the strengthening area. The carbon steel hardware after carbonitriding is sandblasted to remove the alcohol-based aluminum oxide coating in the non-reinforced area, and the carbon steel hardware is tin-plated.

2. The method according to claim 1, characterized in that: After applying the alcohol-based aluminum oxide coating on the non-reinforced area of ​​the carbon steel hardware, the method further comprises: The carbon steel hardware is sprayed with alcohol, and then dried and preheated.

3. The method according to claim 1, characterized in that The carbonitriding process includes the following steps: heating to 515-550° C. under a vacuum of less than 1.5 mbar, introducing nitrogen during the heating process, and entering a heat preservation stage; During the heat preservation stage, alcohol vapor is introduced to form carbonitriding with nitrogen.

4. The method according to claim 3, characterized in that During the insulation stage, nitrogen and alcohol vapor are replaced 12-15 times per hour, the ratio of alcohol vapor to ammonia is 0.1:1-0.3:1, and the insulation time is 1.5-2 hours.

5. The method according to claim 1, characterized in that: The thickness of the nitrided layer and the carburized layer after carbonitriding is 20-30 μm, and the hardness is greater than 600 HV0.2.

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