JPH1058591A - Aluminum-clad metal plate and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold conducting characteristics and heat transfer characteristics at predetermined levels even when a thickness of a thin layer is thin by specifying a height of unevenness on a bonding surface of aluminum of a board to the thin layer. SOLUTION: The aluminum-clad metal plate 1 is a laminate obtained by bringing an aluminum thin layer 6 of pure aluminum into integrally close contact with an upper surface of a metal board 2 made of pure iron. An unevenness 4 having a difference (height) in a thickness direction is mean 2μm or less is formed on a bonding surface 3 of the board 2 to the layer 6. That is, the board 2 is roughed by brushing with a wire brush B rotating to activate the upper surface, the unevenness 4 having a difference in the thickness direction of mean 5μm is formed on an overall bonding surface 3, an aluminum foil 7 is placed on the surface of the board 2, and rolled between rolls. Thus, the height of the unevenness 4 of the surface 3 is compressed to be lowered, and a substrate layer 8 of aluminum is also formed with an uneven surface 8a having a smooth upper surface by following the unevenness 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum clad metal plate in which a thin layer of aluminum or an alloy thereof having a thickness of, for example, 100 μm or less, specifically, several tens μm or less is integrally laminated on a side surface of a metal substrate. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, clad materials in which aluminum or an aluminum alloy (hereinafter simply referred to as "aluminum") foil is integrally laminated on a side surface of a steel plate or the like by pressure rolling or the like have been widely used. These clad materials are aluminum clad materials which maintain strength by a steel plate or the like, and secure conductivity and heat conductivity by an aluminum foil, and complement each other. Such an aluminum clad material is manufactured by the method shown in FIG. First, as shown in FIG.
In order to activate the bonding side surface 52, the side surface 52 is brushed with a rotating wire brush B. Then, as shown in FIG. 5B, irregularities 54 having an average of about 5 μm are formed on the side surface 52 in the thickness direction.

[0003] Next, as shown in FIG. 6 (C), an aluminum foil 60 to be laminated is placed on the side surface 52 of the steel plate 51, and a predetermined gap is placed between a pair of rolls (not shown) facing each other. The aluminum foil 60 is pressed to the side surface 52 of the steel plate 51 by performing rolling with reduction. As a result, as shown in FIG. 6D, the aluminum clad plate 5 composed of the aluminum thin layer 62 and the steel plate 51 is formed.
Get 0. The aluminum thin layer 62 of the clad plate 50
The steel plate 5
Although the height of the unevenness 54 on the one side surface 52 is slightly reduced, it remains about 5 μm. So, for example,
As shown in FIG. 6E, the aluminum thin layer 62
When attempting to bond the aluminum wire 64, there is a problem that the current-carrying characteristics and heat transfer characteristics obtained via the wire 64 vary depending on the position where the wire 64 is fixed. This is because the height of the irregularities 54 is about 5 μm, whereas the thin layer 62 of aluminum is compressed, so that the thickness varies depending on the position of the irregularities 54.
This tendency becomes more pronounced as the initial thickness of the aluminum foil 60 is smaller.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art. Even if the thickness of the thin aluminum layer to be laminated is small, the entire surface of the thin aluminum layer is reduced. It is another object of the present invention to provide an aluminum clad metal plate capable of maintaining a predetermined level of current-carrying characteristics, heat transfer characteristics, and the like, and a method of manufacturing the same.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been made by paying attention to the property that activation such as brushing is not required for joining aluminum materials. That is, the aluminum clad metal plate of the present invention,
An aluminum thin layer and a substrate made of a metal other than these are integrally laminated, and the height of the unevenness on the joint surface of the substrate with the aluminum thin layer is 2 μm or less on average. . The unevenness having an average of 2 μm or less has an average roughness of
The same applies to (Rz), preferably 1 μm or less.
As the material of the substrate, any of pure iron, steel, low alloy steel, special steel, stainless steel, titanium, zinc, nickel, tin, and alloys thereof are used.

Further, the method of manufacturing an aluminum-clad metal plate includes a step of rubbing a side surface of a substrate made of a metal other than aluminum by brushing or the like to form irregularities having an average height of 5 μm on the side surfaces. Average thickness 1 on the side having
A step of coating an aluminum base layer having a thickness of 0 μm or less, a step of cold rolling the obtained aluminum cover plate to make the height of the unevenness of the bonding surface on the substrate side 2 μm or less on average, and a step of coating the aluminum base layer. A step of integrally laminating a surface layer of aluminum on the upper surface of the substrate to obtain a thin layer of aluminum. For the method of coating the aluminum base layer and the method of laminating the aluminum surface layer, any one of pressure rolling, thermal spraying, vapor deposition, and plating is used. Further, a manufacturing method in which the thickness of the aluminum base layer after the cold rolling is 2 μm or less on average is also included. Before laminating the aluminum surface layer, it is preferable that the upper surface of the aluminum base layer is degreased and cleaned. This degreasing is performed by, for example, caustic soda, and the washing is performed by washing with water.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an aluminum clad metal plate 1 of the present invention, and FIG. 1A shows a cross section of the metal plate 1. The aluminum clad metal plate 1 is made of pure aluminum, for example, 1090 (Al; 99.
(9%) of aluminum. As shown in FIG. 1B, irregularities 4 having a difference (height) in the thickness direction of 2 μm or less on average are formed on the bonding surface 3 of the metal substrate 2 with the thin aluminum layer 6. The aluminum thin layer 6 is formed by pressing and bonding both an aluminum base layer and a surface layer described later. Further, the upper surface of the aluminum thin layer 6 may be a gently uneven surface following the unevenness 4 of the bonding surface 3 depending on a pressing condition described later.

FIG. 2 relates to a method of manufacturing an aluminum clad metal plate 1. FIG. 2 (A) shows a pure iron metal substrate 2 having a thickness of 2 mm which is brushed by a wire brush B which rotates to activate the upper surface thereof. This shows the state of being devastated.
As shown in FIG. 3B, unevenness 4 having an average difference of 5 μm in the thickness direction is formed on the entire surface of the joined surface 3 subjected to the desolation. Next, as shown in FIG.
The aluminum foil 7 having the same material as above and having a thickness of 12 μm is placed on the joining surface 3 of the above, and in this state, in order to join them, rolling is performed by passing between a pair of rolls (reduction rate 10%). An aluminum coated plate 5 covered with an aluminum base layer 8 having a thickness of 10 μm or less was obtained (see FIG. 2D).

Further, a plurality of such aluminum-coated plates 5 are prepared, and are subjected to pressure rolling (rolling reduction 50 to 95%) in a cold state.
The thickness of the aluminum base layer 8 is 6 μm, 4 μm, and 2 μm, respectively.
An aluminum coated plate 5 'compressed to m, 1 μm, and 0.5 μm was manufactured. In this case, the height of the unevenness 4 of the bonding surface 3 is also reduced by the above-described pressure rolling, and the aluminum base layer 8 is also formed on the uneven surface 8a having a loose upper surface as shown in FIG. Become. The thickness of the aluminum base layer 8 and the bonding surface 3
3 is shown in the graph of FIG. As is clear from the graph of FIG. 3, it is understood that as the thickness of the aluminum base layer 8 decreases, the height of the irregularities 4 on the bonding surface 3 of the pure iron substrate 2 also decreases. This is because the pure iron substrate 2 is compressed together with the aluminum base layer 8 by the pressure rolling, so that the height of the irregularities 4 on the joint surface 3 is also reduced, and the aluminum base layer 8 is also loosened according to this. It is presumed that it has become a waveform cross section.

[0010] Next, of the above, an aluminum cover plate 5 'in which the thickness of the aluminum base layer 8 is 2 µm or less was used, the upper surface of the aluminum base layer 8 was brought into contact with caustic soda, and then washed with shower water and dried. . Then, an aluminum surface layer 9 having a thickness of 50 μm is placed on the upper surface of the aluminum base layer 8 and subjected to the same pressure rolling (reduction ratio of about 80%) as described above to be laminated. As shown, the overall thickness is between 0.2 and 0.1.
Thus, an aluminum-clad metal plate 1 of mm was obtained. The thickness of the aluminum thin layer 6 obtained as a result was 10 μm ± 1 μm. The aluminum wire described above was bonded to the aluminum thin layer 6 having such a thickness. However, no matter where the bonding was performed, the current-carrying characteristics and the heat transfer characteristics via this wire hardly fluctuated, and a stable result was obtained. was gotten.

In the above, the thickness of the aluminum underlayer 8 is 2 μm.
The following aluminum coated plate 5 'was used because the height of the irregularities 4 on the bonding surface 3 of the substrate 2 was 2 μm or less on average, as shown in the graph of FIG. This is because even if the aluminum surface layer 9 is clad, the respective characteristics are not adversely affected as described above. Also, a thin aluminum base layer 8
This is because the aluminum surface layer 9 having a desired thickness is clad on the upper surface of the substrate, and can be easily and integrally laminated only by degreasing and cleaning, without performing the destruction such as brushing. These points are the points of the present invention.

FIG. 4 relates to another embodiment of the aluminum clad metal plate of the present invention. In FIG. 1A, an unevenness 14 having an average of 5 μm is provided on both surfaces (joining surfaces) 13 of a soft steel substrate 12 by brushing or the like, and an aluminum base layer similar to the above is rolled on the upper surface of each unevenness 14 by rolling. Coating, the above irregularities 14 are 2 μm or less on average, and the thickness of the aluminum underlayer is 2 μm on average.
The cross section of an aluminum clad metal plate 10 obtained by performing cold rolling to not more than m and further pressing and rolling an aluminum surface layer on the upper surface thereof and having a thin aluminum layer 16 having a desired thickness on both surfaces is shown. In the clad metal plate 10 provided with the aluminum thin layers 16 on both surfaces, the current-carrying and heat transfer characteristics are stabilized on both surfaces as a whole, and the corrosion resistance can also be improved.

An aluminum clad metal plate 20 shown in FIG. 4 (B) is provided with an average of 5 μm irregularities 24 on both surfaces (joining surfaces) 23 of a steel plate substrate 22, and an aluminum base layer on each of these upper surfaces. Cover. Next, cold rolling is performed so that the irregularities 24 of the obtained aluminum-coated plate are reduced to an average of 2 μm or less, and the thickness of the aluminum base layer is adjusted to an average of 2 μm or less. On the other hand, the same irregularities 29 are provided on both surfaces of the stainless steel plate substrate 28 to cover the aluminum base layer, and the same cold rolling is performed. Then, an aluminum surface layer is pressed and rolled between these two aluminum coated plates and on both outer surfaces to obtain an aluminum clad metal plate 20 having an aluminum thin layer 26 between the both outer surfaces and the middle. According to such an aluminum clad metal plate 20, substrates of two kinds of materials having different properties from each other and which should be avoided due to difficulty in direct bonding or potential difference or the like are used for the aluminum thin layer 26.
And a clad material obtained by integrally laminating a thin aluminum layer 26 on both outer surfaces or at least one side thereof. Therefore, for example, a plurality of metal substrates having contradictory materials of magnetic and non-magnetic are integrally laminated via a thin aluminum layer, and an aluminum clad metal plate having a thin aluminum layer on at least one of the outer surfaces can be easily formed. Can be obtained.

FIG. 5 relates to a different form of the aluminum clad metal plate of the present invention. FIG. 5A shows only the central portion of the upper surface of the steel plate substrate 32 over the entire length in the longitudinal direction or a predetermined length. 2 shows a cross section of an aluminum clad metal plate 30 provided with a thin aluminum layer 36 having a thickness. That is, a bonding surface 33 having an average roughness of 5 μm at the center of the upper surface of the substrate 32 is formed with a predetermined width in the longitudinal direction by brushing or the like, and the upper surface of the bonding surface 33 is coated with an aluminum base layer. Cold rolling is performed so that the irregularities 34 of the obtained aluminum-coated plate are 2 μm or less on average and the thickness of the aluminum underlayer is 2 μm or less on average. Further, a surface layer of aluminum having a desired thickness is rolled on the upper surface by pressure bonding to obtain a metal plate 30 in which a band-shaped aluminum thin layer 36 is integrally clad at the center of the upper surface of the substrate 32. By providing such a partial aluminum thin layer 36,
Since the aluminum thin layer is integrally clad only at the position where the aluminum wire is to be bonded, the aluminum cladding can be performed efficiently and inexpensively on a metal substrate having a relatively large area.

Further, as shown in FIG. 5B, a plurality of bonding surfaces 43 are provided on the upper surface of a pure iron metal substrate 42 and are separated from each other. Then, the same cold rolling as described above is performed, and the aluminum surface layer is further pressure-rolled to obtain an aluminum clad metal plate 40 having a plurality of aluminum thin layers 46. Each of the plurality of aluminum thin layers 46 may have a strip shape along the longitudinal direction of the substrate 42, or may have a partially independent pattern such as a rectangle, a square, or a circle in plan view. it can. Therefore, it is possible to obtain an aluminum clad metal plate having a thin aluminum layer at an arbitrary position according to the required use mode such as the bonding of the aluminum wire and the contact of the aluminum terminal and the set position.

The present invention is not limited to the embodiments described above. The material of the aluminum alloy is
The pure aluminum-based material described above is desirable, and particularly desirable for an aluminum underlayer. However, Al-Cu (2000), Al-
Mn type (3000 type), Al-Si type (4000 type), Al-Mg type
(5000 type), Al-Mg-Si type (6000 type), or Al
A wrought aluminum alloy of the Zn-Mg type (7000 type) can also be used, and particularly selected for the aluminum surface layer according to the properties of each alloy type. Also, an aluminum alloy having the same composition is used in combination for the aluminum base layer and the same surface layer. However, when an aluminum base alloy such as pure aluminum is used as much as possible for the aluminum base layer, a metal substrate is used. It is desirable on bonding with the like.

The roughening of the side surface of the metal substrate is performed not only by the brushing but also by a grindstone having a predetermined surface roughness, a grinder to which the grindstone is attached, a file, barrel polishing, shot blasting, etching or the like. You can also. Further, the coating of the aluminum surface layer on the substrate and the subsequent cold rolling may be performed by a single pressure rolling, so that the height of the irregularities on the bonding surface may be 2 μm or less on average. In addition, hot dipping plating is used for plating for covering the aluminum base layer or laminating the aluminum surface layer. Further, the cold rolling after coating the aluminum base layer can be performed by heating to about 100 to 150 ° C. in order to activate the metal substrate. The degreasing performed on the upper surface of the aluminum base layer may be performed by a solvent degreasing method, an emulsion degreasing method, an electrolytic degreasing method, or the like, in addition to the alkali degreasing method. Further, ultrasonic cleaning can be used for the subsequent cleaning. Furthermore, the surface layer of aluminum is not limited to a flat cross section,
The outer surface may have a taper in the width direction or may have a gentle curve.

[0018]

As described above, according to the aluminum clad metal plate of the present invention, even if the laminated aluminum thin layer is thin, a uniform thickness can be maintained. Characteristics such as heat transfer, heat transfer, and corrosion resistance are stable, and the above-mentioned characteristics ensure a predetermined level even when used for parts of electric and heat transfer parts such as various heating appliances and electronic / electric devices. It becomes possible. Further, according to the method for manufacturing an aluminum clad metal plate of the present invention, the above-mentioned aluminum clad metal plate can be easily and reliably provided at a low cost by a simple operation.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing one embodiment of the aluminum clad metal plate of the present invention, and FIG. 1B is a partially enlarged view of FIG. 1A.

FIGS. 2A to 2F are cross-sectional views in each step for explaining the method for manufacturing an aluminum-clad metal plate of the present invention.

FIG. 3 is a graph showing the relationship between the thickness of an aluminum base layer in the aluminum clad metal plate of the present invention and the height of irregularities on a bonding surface.

FIGS. 4A and 4B are cross-sectional views showing other forms of the aluminum-clad metal plate of the present invention.

FIGS. 5A and 5B are cross-sectional views showing different forms of the aluminum clad metal plate of the present invention.

6 (A) to 6 (D) are cross-sectional views showing respective steps of manufacturing an aluminum clad material according to a conventional technique, and FIG. 6 (E) is a partial cross-sectional view illustrating a usage mode thereof.

[Explanation of symbols]

1,10,20,30,40 ... aluminum clad metal plate 2,12,22,28,32,42 ... metal substrate 3,13,23,33,43 ... ………… Joining surfaces 4, 14, 24, 29, 34, 44… Unevenness 5, 5 '………………………………………………………………………… Aluminum cover plate 6 , 16,26,36,46 ………… Aluminum thin layer 8 ……………………………………… Aluminum base layer 9 ……… ………………………………… Aluminum surface layer

Claims (6)

[Claims] A thin layer of aluminum or an aluminum alloy and a substrate made of a metal other than these are integrally laminated, and the height of the unevenness on the bonding surface of the substrate with the thin layer of aluminum or its alloy Is an average of 2 μm or less. 2. The material of the substrate is one of pure iron, steel, low alloy steel, special steel, stainless steel, titanium, zinc, nickel, tin, and alloys thereof.
The aluminum-clad metal plate according to 1. 3. A step of roughening the side surface of a substrate made of a metal other than aluminum or an aluminum alloy by brushing or the like to form an unevenness having an average height of 5 μm on the side surface, and forming an average thickness on the side surface having the unevenness. A step of coating a base layer of aluminum or an aluminum alloy having a thickness of 10 μm or less, and a step of cold rolling the obtained aluminum-coated plate to reduce the average height of the irregularities of the bonding surface on the substrate side to 2 μm or less, A method for manufacturing an aluminum clad metal plate, comprising a step of integrally laminating a surface layer of aluminum or an aluminum alloy on an upper surface of a base layer of aluminum or the like to obtain a thin layer of aluminum or an aluminum alloy. 4. The method according to claim 3, wherein the method of coating the underlayer of aluminum or its alloy and the method of laminating the surface layer of aluminum or its alloy are any of compression rolling, thermal spraying, vapor deposition, and plating. Manufacturing method of aluminum clad metal plate. 5. The method for producing an aluminum clad metal sheet according to claim 3, wherein an average thickness of the aluminum or its alloy base layer after the cold rolling is 2 μm or less. 6. The method for producing an aluminum clad metal plate according to claim 3, wherein before laminating the surface layer of aluminum or its alloy, the upper surface of the base layer of aluminum or its alloy is degreased and washed.