Manufacturing method of electric power fittings

Abstract

The present invention relates to the technical field of electric power fitting manufacturing, and in particular to a method for manufacturing electric power fittings, comprising: fixing a copper sheet on the inner surface of a cavity; filling the cavity with molten metal; brazing the molten metal and the copper sheet to form a molten pool between the molten metal and the copper sheet; when the molten metal is at a first preset temperature, ultrasonically welding the molten metal to the copper sheet in the molten pool until the molten metal is at a solidification point; demolding the molten metal and the copper sheet after solidification to obtain an electric power fitting. Its beneficial effect is that by fixing the copper sheet on the inner surface of the cavity, the method can form a molten pool by brazing the molten metal and the copper sheet while the molten metal is cooling and forming; the molten pool formed during brazing can improve the reliability of the weld formed by the solidification of the molten pool under the action of ultrasonic welding, and enhance the corrosion resistance of the electric power fitting. The method forms the outer shape of the electric power fitting through the cavity, which is beneficial to improving the mechanical properties of the electric power fitting.

Description

Technical Field

[0001] The invention relates to the technical field of electric power fittings manufacturing, and in particular to a method for manufacturing electric power fittings. Background Art

[0002] In recent years, the construction of electric power has developed rapidly. With the implementation of power grid projects such as the West-East Power Transmission Project, my country's power transmission and transformation has gradually improved, and a power supply network covering the whole country has been formed with substations as nodes and transmission lines as lines. In order to ensure the normal transmission of electricity, the power fittings used to connect the circuits are particularly important.

[0003] In the related art, due to defects in the manufacturing method, the existing electrical fittings often have the disadvantages of poor mechanical properties and poor corrosion resistance. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing electrical fittings often have the disadvantages of poor mechanical properties and poor corrosion resistance.

[0005] In order to solve the above technical problems, the present invention provides a method for manufacturing an electric power fitting, comprising:

[0006] Fix the copper sheet on the inner surface of the cavity;

[0007] Filling the cavity with molten metal;

[0008] Brazing the molten metal and the copper sheet to form a molten pool between the molten metal and the copper sheet;

[0009] When the molten metal is at a first preset temperature, ultrasonically welding the molten metal to the copper sheet in the molten pool until the molten metal is at a solidification point;

[0010] After the molten metal and the copper sheet are solidified, they are demoulded to obtain an electric power fitting.

[0011] In the above technical solution, ultrasonically welding the molten metal to the copper sheet in the molten pool specifically includes:

[0012] The molten pool is shaken until the molten pool solidifies.

[0013] The above technical solution also includes:

[0014] The outer surface of the copper sheet is covered with flux and solder sheet.

[0015] In the above technical solution, before the outer surface of the copper sheet is covered with flux and solder sheet, it also includes:

[0016] The copper sheet is subjected to ultrasonic tinning treatment.

[0017] In the above technical solution, the solder sheet includes the following components in mass fractions: 92% zinc, 4.5% aluminum and 3.5% copper.

[0018] In the above technical solution, the step of filling the cavity with molten metal comprises:

[0019] Compressed gas is introduced into the sealed container containing the molten metal, so that the molten metal enters the sealed container and fills the mold cavity.

[0020] In the above technical solution, the first preset temperature is 700°C.

[0021] In the above technical solution, the molten metal is formed by melting aluminum ingots by adding a modifier.

[0022] In the above technical solution, the inner surface of the cavity is covered with a release agent.

[0023] In the above technical solution, the copper sheet is adhered to the inner surface of the cavity through its upper and lower ends.

[0024] Compared with the prior art, the manufacturing method of the power fittings of the embodiment of the present invention has the following beneficial effects: by fixing the copper sheet on the inner surface of the cavity, the method can form a molten pool by brazing the molten metal and the copper sheet while the molten metal is cooling and forming; the molten pool formed during brazing can improve the reliability of the weld formed by the solidification of the molten pool under the action of ultrasonic welding, and enhance the corrosion resistance of the power fittings. The method forms the shape of the power fittings through the cavity, which is conducive to improving the mechanical properties of the power fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic flow chart of a method for manufacturing an electric power fitting according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "inside", "outside", etc. used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, it should be understood that the terms "connected", "connected", "fixed" and the like used in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a welding connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] If the first and second are described, they are only used to distinguish the technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0030] like Figure 1 As shown, a method for manufacturing an electric power fitting according to a preferred embodiment of the present invention includes:

[0031] 100: Fixing the copper sheet on the inner surface of the cavity;

[0032] 200: Filling the cavity with molten metal;

[0033] 300: brazing the molten metal and the copper sheet, and forming a molten pool between the molten metal and the copper sheet;

[0034] 400: When the molten metal is at a first preset temperature, ultrasonic welding is performed on the molten pool until the molten metal is at a solidification point;

[0035] 500: After the molten metal and the copper sheet are solidified, they are demoulded to obtain an electrical fitting.

[0036] It can be understood that by fixing the copper sheet on the inner surface of the cavity, the present method can form a molten pool by brazing the molten metal and the copper sheet while the molten metal is cooling and forming; the molten pool formed during brazing can improve the reliability of the weld formed by the solidification of the molten pool under the action of ultrasonic welding, and enhance the corrosion resistance of the power fittings. The present method forms the shape of the power fittings through the cavity, which is conducive to improving the mechanical properties of the power fittings.

[0037] Further, ultrasonically welding the copper sheet and the molten metal in the molten pool specifically includes:

[0038] The molten pool is shaken until the molten pool solidifies.

[0039] It can be understood that by oscillating the molten pool, high-frequency vibration waves are transmitted to the surfaces of the two objects to be welded, so that the two surfaces rub against each other to form fusion between the molecular layers, so as to improve the reliability of the weld formed by the solidification of the molten pool and enhance the corrosion resistance of the electrical hardware.

[0040] Furthermore, it also includes:

[0041] The outer surface of the copper sheet is covered with flux and solder sheet.

[0042] It can be understood that the above method can improve the welding reliability between the copper sheet and the molten metal, thereby enhancing the corrosion resistance of the electrical fittings.

[0043] Furthermore, before the outer surface of the copper sheet is covered with soldering flux and solder sheet, the method further comprises:

[0044] The copper sheet is subjected to ultrasonic tinning treatment.

[0045] It is understandable that such a configuration can cause the oxide layer of the copper sheet to fall off, which helps to improve the reliability of the flux and solder sheet covering the outer surface of the copper sheet.

[0046] Furthermore, the solder sheet includes the following components in mass fractions: 92% zinc, 4.5% aluminum and 3.5% copper.

[0047] Further, the step of filling the cavity with molten metal comprises:

[0048] Compressed gas is introduced into the sealed container containing the molten metal, so that the molten metal enters the sealed container and fills the mold cavity.

[0049] It can be understood that, by using the above method to help the metal liquid form the electric fittings, the method can improve the mechanical properties of the electric fittings.

[0050] In one of the embodiments, the implementation process of the method includes: introducing dry compressed nitrogen into a sealed container filled with molten metal, acting on the surface of the molten metal maintained at a certain pouring temperature, causing a pressure difference between the sealed container and the cavity, so that the molten metal fills the cavity under the action of the gas pressure; the molten metal is made of ZL101A aluminum ingots with a modifier added, and the melt temperature is about 740°C; starting the pressure difference device, under the action of negative pressure, the molten metal slowly rises to the cavity, reacts with the flux at the copper sheet, and the copper-aluminum transition position is welded.

[0051] Preferably, the molten metal is formed by melting aluminum ingots by adding a modifier.

[0052] Furthermore, the inner surface of the cavity is covered with a release agent.

[0053] It is understood that the release agent helps the solidified electrical hardware to separate from the cavity.

[0054] Preferably, the copper sheet is adhered to the inner surface of the cavity through its upper and lower ends.

[0055] In one embodiment, the first preset temperature is 700°C.

[0056] Specifically, one of the implementation processes of the present invention is: sticking a copper sheet on the inner surface of the mold cavity wall, and brushing a heat-resistant release agent on the remaining positions except the copper sheet; filling the cavity with molten metal, slowly brazing it with the thin copper sheet to form a molten pool; when the temperature of the molten metal drops to 700°C, ultrasonically oscillating the molten pool to solidify the copper-aluminum weld, the center of the electrical hardware and the riser in turn, wherein the initial ultrasonic power is 300W, and as the temperature of the molten metal drops to 600°C, the power increases to 600W until the temperature of the molten metal drops to 300°C and stops.

[0057] In the above embodiment, for the three factors affecting the forming, density and appearance of the wire clip: the initial temperature of the molten metal (°C), the first preset temperature (°C), and the vibration power (W), a three-factor mixed three-level orthogonal experiment as shown in the following table was designed:

[0058]

[0059]

[0060] Density is measured by cutting the sample, washing and drying it, immersing it in water on a precise balance. The density calculation formula is:

[0061]

[0062] ρ is the density;

[0063] P1 is the weight of the test piece in air;

[0064] γ is the density of water;

[0065] P2 is the weight of the test piece in water.

[0066] For the above-mentioned preparation method, the present invention also provides a nondestructive testing method, comprising:

[0067] Ultrasonic phased array probes are used to detect thin copper sheets;

[0068] Ultrasonic guided wave probe with transmission from above and reception from below;

[0069] Surface and near-surface ET flaw detection;

[0070] The copper-aluminum transition joint weld surface nondestructive testing device is equipped with a black light (320-420nm) for fluorescent material detection and a defect shooting device (including a camera with an ultraviolet sensitive screen).

[0071] In summary, the embodiment of the present invention provides a method for manufacturing an electric power fitting, which fixes a copper sheet on the inner surface of a mold cavity. The method can form a molten pool by brazing the molten metal and the copper sheet while the molten metal is cooling and forming; the molten pool formed during brazing can improve the reliability of the weld formed by the solidification of the molten pool under the action of ultrasonic welding, and enhance the corrosion resistance of the electric power fitting. The method forms the shape of the electric power fitting through the mold cavity, which is conducive to improving the mechanical properties of the electric power fitting.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for manufacturing an electric power fitting, characterized in that: include: Fix the copper sheet on the inner surface of the cavity; Filling the cavity with molten metal, comprising: Introducing compressed gas into a sealed container containing the molten metal, so that the molten metal enters the sealed container and fills the mold cavity; Brazing the molten metal and the copper sheet to form a molten pool between the molten metal and the copper sheet; When the molten metal is at a first preset temperature, ultrasonically welding the molten metal to the copper sheet in the molten pool until the molten metal is at a solidification point, specifically comprising: vibrating the molten pool until the molten pool solidifies; After the molten metal and the copper sheet are solidified, they are demoulded to obtain an electric power fitting.

2. The method for manufacturing an electric power fitting according to claim 1, characterized in that: Also includes: The outer surface of the copper sheet is covered with flux and solder sheet.

3. The method for manufacturing an electric power fitting according to claim 2, characterized in that: Before the outer surface of the copper sheet is covered with soldering flux and solder sheet, the method further comprises: The copper sheet is subjected to ultrasonic tinning treatment.

4. The method for manufacturing an electric power fitting according to claim 2, characterized in that: The solder sheet includes the following components by mass: 92% zinc, 4.5% aluminum and 3.5% copper.

5. The method for manufacturing an electric power fitting according to claim 1, characterized in that: The first preset temperature is 700°C.

6. The method for manufacturing an electric power fitting according to claim 1, characterized in that: The molten metal is formed by adding a modifier to an aluminum ingot and melting it.

7. The method for manufacturing an electric power fitting according to any one of claims 1 to 6, characterized in that: The inner surface of the cavity is covered with a release agent.

8. The method for manufacturing an electric power fitting according to any one of claims 1 to 6, characterized in that: The copper sheet is adhered to the inner surface of the cavity through its upper and lower ends.

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