KR20110039003A - The method for manufacturing of a al-cu bus bar - Google Patents

Abstract

PURPOSE: A method for manufacturing of an Al-Cu bus bar and the Al-Cu bus bar thereof is provided to implement desired width, thickness, and hardness without limiting a size. CONSTITUTION: In a method for manufacturing of an Al-Cu bus bar and the Al-Cu bus bar thereof, first member and second members are arranged(S1). The first member is made of aluminum material. The second member has copper material. The first member and second members are combined with each other through explosive welding(S2). A side groove is formed in both sides of the first membe(S4). Both ends of the second member is drawn out to cover the both sides of the first member.

Description

Method for manufacturing aluminum copper busbars and aluminum copper busbars produced by the method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing aluminum copper busbars, and more particularly, to an aluminum copper busbar manufacturing method capable of manufacturing a busbar in which aluminum and a copper plate coated on the aluminum are firmly bonded to each other.

Busbars that are commonly used have various shapes as needed, but are generally flat and long in the longitudinal direction. A busbar 100 of this type is illustrated in FIG. 1. Since the busbar has a large surface area, it is excellent in heat dissipation effect and can transmit a large current by lowering the impedance of the high frequency current flowing on the surface. In addition, the busbar has an advantage of transmitting more electric energy to the same volume of conductors.

Therefore, the busbar mainly consists of power transmission circuits such as power plants, large buildings, large factories, large department stores, subways, new airports, etc., and large power distribution circuits with large current capacity, conductors for electrical equipment, and communication cables. As a result, the use of cable as an alternative to cable is increasing.

These busbars are made of almost pure copper because of their high electrical conductivity (100% IACS) and high melting point (1083 ° C). However, pure copper is not only expensive but also has a relatively high specific gravity (8.92 g / cm ³ ), making it difficult to store and install busbars, and require a lot of installation time, thereby increasing the overall production cost and installation cost. It is a factor.

In order to solve this problem, busbars manufactured by coating copper on the outside of aluminum have been introduced to reduce costs, reduce weight, and improve performance.

The inner core of the busbar is aluminum, and its top, bottom and both sides are covered with copper. Such busbars are manufactured by the following conventional method.

First, the aluminum rod 102 is inserted into the copper pipe 104 (see sectional drawing in FIG. 2). Then, the combination of the aluminum rod 102 and the copper pipe 104 is heated. This is a process for giving ductility to the binder. The heated binder is then rolled to form busbars having a substantially rectangular cross section. A cross-sectional view of the busbar having undergone this process is illustrated in FIG. 3.

However, such a conventional manufacturing method has a problem in that the thermal expansion coefficients of dissimilar metals of copper and aluminum are different, and thus the joints are not firmly formed in the process of heating and rolling the binder, so that defective products are likely to be mass-produced.

In addition, in the manufactured state, even if the product is not defective, the bonding between copper and aluminum is often insufficient, resulting in a problem that the bonding portion is cracked due to mechanical shock, which frequently occurs during use. This also increases maintenance costs.

In addition, the busbar manufactured by such a manufacturing method has a problem that, due to the physical properties of the material and the limitations of the manufacturing process, it is difficult to be manufactured more than a limited width and thickness, and the hardness is not possible to a certain level or more.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a manufacturing method capable of producing an aluminum copper busbar having a sufficiently strong bonding force between aluminum and a copper plate covering the same.

It is also an object of the present invention to provide a manufacturing method capable of producing an aluminum copper busbar having a desired predetermined width and thickness and having a desired hardness without being limited in size.

Further, another object of the present invention is to provide an aluminum copper busbar having a sufficiently strong bonding force between aluminum and a copper plate coated on the upper side and the lower side thereof.

Aluminum copper busbar manufacturing method according to the present invention for achieving the above object, the first member of the plate shape and aluminum material, and the second member of the plate shape and copper material on each of the upper and lower surfaces of the first member Plate member arrangement step of placing; An explosion welding step of performing an explosion welding method such that the first member and the second member are coupled to each other; Forming side grooves on both side surfaces of the first member; And a drawing step of drawing the both ends of the second member to cover both sides of the first member.

On the other hand, after the explosion welding step, it is preferable to further include a rolling step of rolling the first and second members coupled to each other, and a cutting step of cutting to a predetermined desired size.

On the other hand, after the side groove forming step, it is preferable to further include a heat treatment step of heating in the range of 3.5 to 4.5 hours at a temperature in the range of 480 ~ 530 ℃.

In addition, the side groove forming step is preferably carried out by any one of drawing, cutting or milling.

On the other hand, after the side groove forming step, it is preferable to further include a third member arrangement step of disposing a third member of the copper material in the longitudinal direction along the side grooves in each of the side grooves formed on both sides of the first member. .

The third member is a plate member having a thin and long shape, and is preferably disposed in a direction perpendicular to the side groove.

In addition, the side grooves are formed over the entire thickness of the first member, and considering the vertical cross-sectional view of the mutually coupled first and second members, the outer line of the side grooves preferably form a convex curve inward. Do.

Meanwhile, an aluminum copper bus bar according to another aspect of the present invention is aluminum and includes a plate-shaped first member; An upper second member coupled to an upper surface of the first member; And a lower second member coupled to a lower surface of the first member, wherein left and right side surfaces of the first member are covered by both end portions of at least one of the upper second member and the lower second member. It is characterized by.

On the other hand, the upper end portions of the left and right sides of the first member are covered by both end portions of the upper second member, and the lower end portions of the left and right sides of the first member are covered by both side ends of the lower second member. Preferably, both side ends of the upper second member and both side ends of the lower second member are configured to be in contact with each other and coupled.

Further, it is preferable that a third member made of copper is further provided between the left and right side surfaces of the first member and the inner surfaces of both side end portions of the upper and lower second members joined to the respective side surfaces.

On the other hand, at least a portion of each of the left and right side surfaces of the first member, it is preferable that both side end portions of the upper second member and both side end portions of the lower second member overlappingly coupled.

Further, it is preferable that a third member made of copper is further provided between the left and right side surfaces of the first member and the inner side surfaces of both side ends of the upper and lower second members coupled to each other by overlapping the side surfaces.

According to the method for producing aluminum copper busbars according to the present invention, it is possible to obtain an effect that an aluminum copper busbar having a sufficiently strong bonding force between aluminum and a copper plate covering the same can be produced.

Moreover, according to the manufacturing method of this invention, the effect that it is possible to manufacture aluminum copper busbar can be manufactured, without being restrict | limited to the magnitude | size of the thickness and width.

Moreover, according to the manufacturing method of this invention, there exists an effect that an aluminum copper busbar can be manufactured without restrict | limiting to the magnitude | size of the thickness and width.

In addition, according to the manufacturing method of the present invention, there is an effect that it is possible to manufacture aluminum copper busbar having a relatively high hardness.

Hereinafter, a method of manufacturing aluminum copper busbars according to an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 8.

Aluminum copper busbar manufacturing method of the present embodiment, the plate member arrangement step (S1), explosion welding step (S2), rolling and cutting step (S3), side groove forming step (S4), heat treatment step (S5) and drawing step It is comprised including (S6).

As illustrated in FIG. 5, the plate member arrangement step S1 may include a first member 10 having a plate shape and an aluminum material, and an upper second plate having a plate shape and a copper material on an upper surface of the first member 10. It is a step of arrange | positioning the member 22 and the lower 2nd member 24 which is plate-shaped and copper material on the lower surface of the 1st member 10. FIG. The first member 10 and the second members 22 and 24 are disposed in close contact with each other. However, depending on the specific demands of the explosion welding to be carried out later, the first member and the second member may be spaced apart from each other, or may be arranged to be inclined to each other by contacting one side and the other side.

The plate member arranging step (S1) is a step of placing the first member 10, which is the middle aluminum plate member, and placing the second members 22, 24, which are copper plate members, respectively on the upper and lower surfaces thereof. The first member 10 of aluminum is relatively thicker than the second members 22, 24 of copper. The thickness and width of each plate member 10, 22, 24 can be variously modified as necessary. However, it is preferable that the upper and lower second members 22 and 24 have the same thickness.

The explosion welding step (S2) is a step of performing an explosion welding method such that the first member 10 and the second members 22 and 24 are coupled to each other. In general, the explosion welding method is a method of joining two or more metal plates to each other by explosive pressure of a gunpowder.

By using the explosion welding method, even if the first and second members have different types and relatively large areas, strong bonding is possible. Since the explosion welding step uses an appropriate explosion welding method commonly known to those skilled in the art to suit the thickness and size of the first and second members, further detailed description thereof will be omitted.

On the other hand, in the present embodiment, further comprising the step (S3) of rolling and cutting the combination of the first, second members (10, 22, 24) bonded to each other by the explosion welding step (S2). That is, the combination of the first and second members 10, 22, and 24 is rolled to make the entire thickness to a desired degree, and then the rolled assembly to the desired size is cut.

However, in other embodiments, if necessary, both the rolling and cutting steps S3 may be omitted, or only the cutting step may be performed, or only the edges may be cut after the rolling step.

Next, the side groove forming step (S4) is performed.

Side groove forming step (S4) is a step of forming the side grooves 12 on both sides of the first member (10). Side grooves 12 are formed over the entire thickness of the first member 10 in the vertical direction.

Referring to FIG. 6, in which the assembly of the first and second members 10, 22, 24 is shown as a vertical cross sectional view, the outer line of the side groove 12 forms a convex curve inward toward the inside of the assembly. That is, the side groove 12 is concave inwardly, and is machined to have the same cross-sectional shape along the longitudinal direction on the entire side surface of the first member 10. However, in another embodiment, the shape or depth of the side grooves may be variously modified in consideration of the thicknesses of the first and second members.

On the other hand, the side groove forming step (S4), in the present embodiment, is performed by drawing. However, in another embodiment, instead of drawing, the side groove may be processed by cutting or milling.

Next, the manufacturing method of the present embodiment, after the side groove forming step (S4), the heat treatment for heating the assembly of the first, second members (10, 22, 24) to a temperature within the range of 530 ℃ within 3.5 to 4.5 hours Step S5 is further provided. These temperatures and time ranges take into account the characteristics of copper and aluminum, and determine a specific temperature time range in consideration of the thicknesses of the first and second members.

On the other hand, the heat treatment step (S5) is given to the soft properties of the first and second members made of aluminum and copper, is performed to facilitate the drawing process to be performed later. However, in another embodiment, the heat treatment step may be omitted as necessary and the thickness of the first and second members.

Next, the drawing step S6 is performed.

The drawing step S6 is a step of processing so that both end portions of the upper and lower second members 22 and 24 may cover both side surfaces of the first member 10. The drawing method is generally a metal processing method in which metal is pulled toward the outlet through a die or a die ball so that the metal shrinks in cross section depending on the shape of the die or die ball and at the same time has a desired cross-sectional shape.

That is, in the present embodiment, when the first and second member combinations in which the side grooves 12 are formed are pulled through a die or die hole having a desired predetermined cross section, as illustrated in FIG. The lower second members 22 and 24 are rolled in due to the presence of the side grooves 12, so that both ends of the upper and lower second members 22 and 24 as illustrated in FIG. The aluminum copper busbar 1 covering both sides of the one member 10 is manufactured. At this time, the shape of the die or the die hole in the drawing step can be adjusted to obtain an aluminum copper busbar having a desired cross-sectional shape.

The upper second member 22 and the lower second member 24 are joined to each other at opposite ends in the middle portion 26 of the height of both sides of the first member.

As described above, when performing a series of steps of the manufacturing method according to an embodiment of the present invention, the first member 10 of the aluminum material is located therein, the copper material on each of the top, bottom and side surfaces thereof. An aluminum copper busbar 1 is manufactured in which the second members 22 and 24 are coupled with high bonding force.

The aluminum copper busbar manufacturing method of this embodiment has the advantage that the bonding between aluminum and copper is superior to conventional busbars, because the joining of the aluminum plate and the copper plate is made by explosion welding.

In addition, since the first and second members form a combination by explosion welding, there is an advantage that the first and second members are relatively large in size and applicable to the combination of the thick first and second members. Therefore, the aluminum copper busbar which can be manufactured by the present invention has an advantage that its size and thickness can be much larger and thicker than in the prior art.

In addition, since the aluminum copper busbar manufacturing method of the present embodiment includes side grooves 12 on both side surfaces of the first member 10 of aluminum, when the drawing process is performed, both side surfaces of the first member 10 are also provided. There is an advantage that the second members 22 and 24 can be firmly coupled.

On the other hand, Fig. 9 illustrates another form of aluminum copper busbar 2 that can be produced by the aluminum copper busbar manufacturing method of the present invention.

In the aluminum copper busbar 2, both side ends 27 of the upper second member 22 and both side ends 28 of the lower second member 24 are joined to both side surfaces of the first member 10 in an overlapping manner. . The aluminum copper busbar 2 having such a configuration has an advantage that a bonding force between both side surfaces of the first member 10 and the second members 22 and 24 is relatively better than that of the aluminum copper busbar 1.

Aluminum copper busbars 2 of this type can also be produced by a method substantially similar to the aluminum copper busbar manufacturing method of the embodiment described above. Compared to the method for manufacturing the aluminum copper busbar 1 described above, in the side groove forming step, the depth and shape of the side grooves of the first member 10 are modified, and if necessary, dies or dies in the drawing step. By modifying the shape of the ball, it is possible to manufacture aluminum copper busbars 2 of the type as illustrated in FIG. 9.

On the other hand, Figure 10 and Figure 11 is a view for explaining the aluminum copper busbar manufacturing method of another embodiment according to the present invention is illustrated. The aluminum copper busbar manufacturing method of this embodiment is a suitable method when obtaining a relatively thick busbar, for example, having a thickness of 15 mm or more.

Comparing the aluminum copper busbar manufacturing method of the present embodiment with the first manufacturing method described above, it is characterized in that it further comprises a third member arrangement step after the side groove forming step (S4). The third member arrangement step may be performed before or after the heat treatment step when the heat treatment step is performed.

Except for this, the other steps are the same. Therefore, only different configurations will be described, and the steps not described are applied as they are or modified appropriately.

Reference is made to FIG. 10, which is a vertical cross-sectional view of the assembly in which the first member 10 and the upper and lower second members 22, 24 are coupled to each other. In the present embodiment, after the side groove forming step, the third member 25 is disposed in the side grooves formed on both sides of the first member 10.

The third member 25 is made of copper and is disposed in the longitudinal direction along the side grooves in each of the side grooves formed on both side surfaces of the first member 10. That is, the side groove is formed long in the longitudinal direction of the first member, the third member 25 is disposed in the vertical direction over the entire length.

The pair of third members 25 of the present embodiment is a plate member having a thin and long shape, and as shown in FIG. 10, is disposed perpendicular to the side grooves. In another embodiment, in consideration of the thickness of the first member, the depth of the side grooves, the thickness of the second member, etc., the specific shape of the third member 25 may be variously modified, such as a cylindrical shape, in addition to the thin plate shape. .

After arranging the third member 25 in the side groove, the drawing step (S6) described above, the aluminum copper bus bar 3, as illustrated in the cross-sectional view in Figure 11 can be obtained.

According to the manufacturing method of the aluminum copper busbar of this embodiment, by further providing a third member on both sides, there is an advantage that the bonding force of the copper and aluminum at the side is better, and a relatively thick aluminum copper busbar can be obtained.

On the other hand, in Figure 12, both sides of the first member 10, both side end portion 27 of the upper second member 22, and both side end portions 28 of the lower second member 24 overlap the aluminum. The busbar 4 is shown. In order to manufacture the aluminum copper busbar 4 of such a configuration, the shape and depth of the side grooves and the drawing step are adjusted.

For example, the side grooves are formed deeper than in the case of FIG. 11, and both ends 28 of the lower second member 24 are first bent toward the first member 10 during the drawing step, and then both ends of the upper second member. Adjusting the bend to 27 yields the aluminum copper busbar 4 shown in FIG.

Meanwhile, an aluminum copper busbar according to another aspect of the present invention is disclosed.

8 illustrates an example of an aluminum copper busbar 1 according to the present invention, FIG. 9 illustrates another embodiment of an aluminum copper busbar 2, and FIG. 11 illustrates another embodiment of an aluminum copper busbar. Bar 3 is illustrated, and in FIG. 12 an aluminum copper busbar 4 of another embodiment is illustrated.

These aluminum copper busbars may be manufactured by the above-described method for manufacturing aluminum copper busbars, which will be omitted when overlapped with the description of the manufacturing method. Hereinafter, the embodiments will be described in sequence.

The aluminum copper busbar 1 of the embodiment according to the present invention is aluminum and has a plate-shaped first member 10 and an upper second member 22 and a first coupled to an upper surface of the first member 10. It is configured to include a lower second member 24 coupled to the lower surface of the member (10).

The left and right side surfaces of the first member 10 are covered by both end portions of the upper second member 22 and the lower second member 24. In the present embodiment, when the left and right sides of the first member 10 are divided in approximately half in the height direction, the upper half of the upper half is covered and joined by both end portions of the upper second member 22, The lower half, which is the remaining lower half, is covered and joined by both end portions of the lower second member 24.

In addition, both end portions of the upper second member 22 and both end portions 24 of the lower second member are brought into contact with each other at a portion indicated by 26.

On the other hand, in the aluminum copper busbar 2 illustrated in FIG. 9, the left and right side surfaces of the first member 10 are formed at both side end portions 27 and the lower second member 24 of the upper second member 22. Both side ends 28 are coupled to overlap.

In addition, the aluminum copper busbar 3 illustrated in FIG. 11 has a right and left side surfaces of the first member 10 and both side end portions of the upper and lower second members 22 and 24 coupled to the respective side surfaces. Between the side surfaces, the third member 25 made of copper is further provided.

In addition, the aluminum copper busbars 4 illustrated in FIG. 12 have both left and right side surfaces of the first member 10 and both side end portions of the upper and lower second members 22 and 24 coupled to each other in such a manner. Between the inner surfaces, a third member 25 made of copper is further provided.

The effects on the above-described aluminum copper busbars 1, 2, 3, and 4 are applied as they are or are appropriately modified in connection with the manufacturing method.

1 is a perspective view of a bus bar in which the whole is made of copper;

2 to 3 are views for explaining a conventional bus bar in which copper is coated on aluminum,

4 is a flowchart of a method for manufacturing aluminum copper busbars according to an embodiment of the present invention;

5 is a view for explaining the plate member arrangement step of FIG.

6 to 7 is a cross-sectional view in the vertical direction of the combined first, second members,

8 is a cross-sectional view of an aluminum copper busbar manufactured by the manufacturing method of FIG. 4;

9 is a cross-sectional view of an aluminum copper busbar of another configuration manufactured by the manufacturing method of the present invention;

10 to 11 are cross-sectional views for explaining a method for manufacturing aluminum copper busbars having a third member;

12 is a cross-sectional view illustrating an aluminum copper bus bar further including a third member and having a second member overlapped and coupled to both sides of the first member;

Claims (12)

A plate member disposing step of disposing a first member of a plate shape and an aluminum material, and a second member of a plate shape and a copper material on each of an upper surface and a lower surface of the first member; An explosion welding step of performing an explosion welding method such that the first member and the second member are coupled to each other; Forming side grooves on both side surfaces of the first member; And And a drawing step of drawing the both ends of the second member so as to cover both side surfaces of the first member. The method of claim 1, After the explosion welding step, further comprising a rolling step of rolling the first and second members coupled to each other, and a cutting step of cutting to a predetermined size required. The method of claim 1, After the side groove forming step, the aluminum copper bus bar manufacturing method further comprises a heat treatment step of heating to a temperature in the range of 480 ~ 530 ℃ within 3.5 ~ 4.5 hours. The method of claim 1, The side groove forming step, aluminum copper busbar manufacturing method characterized in that it is carried out by any one of drawing, cutting or milling. The method of claim 1, After the side groove forming step, And a third member arranging step of arranging a third member of a copper material in a longitudinal direction along the side grooves in each of the side grooves formed on both side surfaces of the first member. The method of claim 5, The third member is a thin and long plate member, the aluminum copper busbar manufacturing method, characterized in that arranged in the vertical direction to the side groove. The method of claim 1, The side groove is formed over the entire thickness of the first member, Considering the vertical cross-sectional view of the mutually coupled first and second members, the outer line of the side grooves is an aluminum copper busbar manufacturing method characterized in that the convex curve inward. Aluminum and a plate-shaped first member; An upper second member coupled to an upper surface of the first member; And A lower second member coupled to a lower surface of the first member; The left and right side surfaces of the first member are covered by both end portions of at least one of the upper second member and the lower second member. The method of claim 8, Upper ends of the left and right sides of the first member are covered by both end portions of the upper second member, Lower ends of the left and right sides of the first member are covered by both end portions of the lower second member, Both side ends of the upper second member, and both side ends of the lower second member is aluminum copper bus bar, characterized in that configured to be in contact with each other. 10. The method of claim 9, An aluminum copper booth is further provided between a left and right side surfaces of the first member and an inner surface of both side ends of the upper and lower second members coupled to the respective side surfaces. bar. The method of claim 8, At least a portion of each of the left and right side surfaces of the first member, both side end portions of the upper second member and both side end portions of the lower second member are coupled to overlap the aluminum copper bus bar. The method of claim 11, An aluminum copper booth is further provided between a left and right side surfaces of the first member and an inner side surface of both side ends of the upper and lower second members joined to each other overlapping the side surfaces. bar.

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