KR20080102524A - Manufacturing method of complex busbar by explosion expander - Google Patents

Abstract

A complex busbar manufacturing method by explosion-expansion is provided to reduce the manufacturing process and cost by welding a core formed inside a cladding to the inner surface of the cladding through explosion-expansion. A complex busbar manufacturing method by explosion-expansion is as follows. A core(200) having a diameter smaller than that of a cladding is inserted in the hollow cladding(100). After a fuse(300) is positioned inside the core, the fuse is ignited. As the core is expanded instantaneously upon the explosion of the fuse, the exterior of the core is welded to the interior of the cladding and a hollow busbar is completed. The fuse, which is an explosion wire where a high-energy explosive compound is filled in a fine metallic tube, has a length equal to or greater than that of the core. The cladding is made of copper and the core is made of aluminum, or otherwise. A buffer material can be put in between the fuse and the core for more uniform expansion.

Description

Manufacturing method of complex busbar by explosion expander

Figure 1-Schematic diagram of a method for manufacturing a composite busbar by explosion expansion according to the present invention ((a) before explosion expansion, (b) after expansion expansion).

Figure 2-a perspective view of the case where the composite busbar by explosion expansion in accordance with the present invention formed in a hollow.

Figure 3-perspective view of the case where the composite busbar by explosion expansion according to the invention is formed in a flat plate type.

<Description of Major Symbols Used in Drawings>

100: covering material (100) 200: core material

300: dopter line

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a busbar, and more particularly, to a method for manufacturing a composite busbar by explosion expansion, which simplifies a manufacturing process and reduces cost by welding a core material formed inside a coating material to an inner surface of the coating material by explosion expansion.

In general, busbars are made of copper and have a large surface area, and thus have excellent heat dissipation effect and are widely used in a system for delivering large currents by lowering the impedance of high frequency current flowing on a surface.

Conventional busbars are made of almost pure copper due to their high electrical conductivity (100% IACS) and high melting point (1083 ° C), but pure copper has a high specific gravity (8.92 g / cm ³ ) and a busbar. It is difficult to store and install, and it takes a lot of installation time, which is a factor that increases the overall production cost and installation cost.

In order to solve these problems, in recent years, the copper material is coated on the outside of aluminum to reduce the cost, reduce the weight, and improve the performance, or the copper is coated on the outside of the iron alloy to increase the strength. Busbars are coming out.

The busbar formed of the copper clad composite is manufactured by clad bonding method, hydrostatic extrusion method and indirect extrusion method. Clad bonding method is formed by rolling two or more metal materials at a high temperature. Hydrostatic Extrusion and Indirect Extrusion may be performed by inserting a billet of a predetermined type into an extrusion container to manufacture a busbar formed of a layered composite material.

However, the method of rolling by cladding is generally made at a high temperature. Metal materials such as copper and iron are oxidized at a low temperature of 200 ° C. or lower, or the thermal expansion coefficients of the metal materials are different so that the bonding is performed properly. It is not made to produce a defective product, and this method also has a problem that the production process and equipment is complicated and the production cost is high.

In addition, the hydrostatic extrusion method is not easy to handle the pressure transfer solvent, and in addition to the indirect extrusion method, the extrusion apparatus is large, expensive, expensive to maintain, and complicated to use, resulting in inefficient work efficiency. It is becoming a factor to raise.

The present invention has been made to solve the above problems, by providing a method for manufacturing a composite busbar by explosion expansion to simplify the manufacturing process and reduce the cost by welding the core material formed inside the coating material to the inner surface of the coating material by explosion expansion. The purpose.

In order to achieve the object as described above, the present invention, by inserting a central material having a relatively smaller inner diameter than the coating material inside the hollow coating material, by placing a dopant line inside the central material, by expanding the explosion of the center material The manufacturing method of the composite busbar by explosion expansion characterized by welding the said central material to the said inner surface of the said coating material is a technical subject matter.

In addition, it is preferable that the coating material is provided as a copper-aluminum composite busbar formed of copper, and the core material is made of aluminum, or the coating material is provided as an aluminum-copper busbar which is aluminum and the core material is copper.

Here, the central material, two or more different metals may be coaxially formed around the dopant line, and aluminum and copper in contact with the coating material, aluminum alloy and copper in contact with the coating material, and the coating material depending on the purpose and purpose. It is preferable that it is any of iron and copper which contact | connect, and an iron alloy and copper which contact | connect the said coating material.

In addition, it is preferable that the composite bus bar by the explosion expansion is processed into a flat shape by hollow or rolling.

Therefore, by welding the core material formed inside the cladding to the inner surface of the cladding by explosion expansion, it simplifies the manufacturing process and manufacturing equipment and reduces the production cost. The advantage is that it can be used efficiently without malfunction in large current systems.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. 1 is a schematic diagram of a method for manufacturing a composite busbar by explosion expansion according to the present invention ((a) before explosion expansion, (b) after expansion expansion), Figure 2 is a composite busbar hollow by explosion expansion according to the present invention 3 is a perspective view of a case formed in a mold, and FIG. 3 is a perspective view of a case in which a composite bus bar is formed in a flat form by explosion expansion according to the present invention.

As shown in FIG. 1, the method for manufacturing a composite busbar by explosion expansion according to the present invention inserts a central material 200 having a smaller inner diameter than the coating material 100 into a hollow covering material 100. By placing the dopant line 300 in the center member 200 and igniting the dopant line 300 (FIG. 1 (a)), the center member 200 is instantaneously caused by the explosion of the dopant line 300. By expanding the outer surface of the core material 200 to the inner surface of the coating material 100 is a high-temperature welding (Fig. 1 (b)) is to complete the hollow busbar. The explosive wire 300 used to expand the explosion of the central material 200 is a wire (explosion wire) in a very thin metal tube with a high energy explosive is formed the same or longer than the length of the central material 200, the center It is placed in the center of the ash (200). Here, the buffer member may be further inserted between the dopant line 300 and the center member 200 for a more uniform expansion.

The core material 200 is instantaneously expanded and welded to the inner surface of the coating material 100 while generating the high temperature by the impact force caused by the shock wave while the dopant wire is burst by the ignition of the dopant wire 300. Hollow composite busbars are completed by cutting.

As a result, the core member 200 is formed by uniform explosion expansion in a short time by ignition of the hollow covering member 100, the hollow central member 200 inserted therein, and the dopant line 300 positioned therein. Welding to the cladding material 100 is brought to reduce the cost of the busbar and significantly simplify the process.

In this case, the coating material 100 is made of copper having excellent electrical conductivity and mechanical properties, and the core material 200 may be manufactured of a hollow copper-aluminum composite bus bar using aluminum for cost reduction and easy processing. In addition, a hollow aluminum-copper composite busbar is manufactured using aluminum as the coating material and copper as the center material 200.

In general, since the oxidation of copper easily occurs in the air, when the bus bar is used in a humid place such as a basement, it is preferable to use an aluminum-copper composite bus bar in which the coating material 100 is made of aluminum. This can prevent the oxidation of copper by the aluminum oxide film by using aluminum as a coating material 100, it is possible to supply a bus bar excellent in corrosion resistance.

In addition, the core material 200 may be formed of two or more metal materials in consideration of the current capacity of the bus bar using system and the mechanical strength to withstand during use. Preferably, the core member 200 may be used to select any one of aluminum and copper, aluminum alloy and copper, or iron and copper, or iron alloy and copper in order from the coating member 100. Depending on the purpose, a plurality of the center material 200 may be formed in this order or mixed.

The busbar manufactured by the explosion expanding method has two or more composite materials as shown in FIG. 2, and the shape of the busbar is cylindrical. According to the purpose and purpose of use, as shown in FIG. 3, the hollow bus bar may be subjected to a rolling process to form a flat bus bar.

The present invention by the above configuration, by welding the core material formed inside the coating material to the inner surface of the coating material by explosion expansion, simplifying the manufacturing process and manufacturing equipment and reducing the production cost and by uniformly expanding the uniform material throughout the core material By minimizing the defective rate of the product, there is an effect that can be used efficiently without malfunction in the high current system.

Claims (6)

Inserting a central material having a smaller inner diameter than the coating material inside the hollow coating material, placing a dopant line in the interior of the core material, and expanding the explosion of the central material to weld the central material to the inner surface of the coating material. Composite busbar manufacturing method by explosion expansion. The method of claim 1, wherein the coating material is copper, and the center material is aluminum. The method of claim 1, wherein the coating material is aluminum, and the core material is copper. The method of claim 1, wherein the central material, The method for manufacturing a composite busbar by explosion expansion, characterized in that two or more different metals are coaxially formed about the dopant line. The method of claim 4, wherein the center material, Aluminum and copper in contact with the coating material, aluminum alloy and copper in contact with the coating material, iron and copper in contact with the coating material, iron alloy and copper in contact with the coating material, characterized in that any one of the bus bar manufacturing method by explosion expansion. . The method for manufacturing a composite busbar by explosion expansion according to any one of claims 1 to 5, wherein the composite busbar by explosion expansion is processed into a flat plate by hollow or rolling.

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