KR101984482B1 - Precoated aluminum alloy plate for heat dissipation members, and heat dissipation member using same - Google Patents

Abstract

A precoated aluminum alloy plate (1) comprising an aluminum alloy plate (10), a first coating film (11) formed on one surface thereof and a second coating film (12) formed on the other surface, Member. The first coating film 11 has better heat radiation than the surface of the aluminum alloy plate 10 and the second coating film 12 has an adhesive function to be melted or softened by heating to become an adhesive. The first coating film 11 is composed of a first base resin composed of at least one kind selected from urethane resin, polyolefin resin, epoxy resin, fluororesin and polyester resin and having a softening point exceeding 150 ° C. .

Description

TECHNICAL FIELD [0001] The present invention relates to a pre-coated aluminum alloy sheet for a heat dissipating member, and a heat dissipating member using the same. BACKGROUND ART [0002]

TECHNICAL FIELD The present invention relates to a precoated aluminum alloy sheet for a heat dissipating member and a heat dissipating member manufactured using the same, which is suitable as a material of a heat dissipating member for promoting heat dissipation of electric devices such as a lighting apparatus.

For example, a lighting apparatus using an LED as a light source has come into practical use as the performance of the LED becomes higher. In such a lighting device, for example, a heat dissipating member integrally formed with a heat dissipating fin is provided to promote heat dissipation. As a conventional heat dissipating member, forgings or castings of an aluminum alloy having heat dissipation fins integrally as shown in Patent Document 1, for example, are often used.

Patent Document 1: JP-A-2010-73654

Conventional heat dissipating members made of aluminum alloy forgings or castings can secure heat dissipation to some extent, but they are heavy in weight, low in productivity, and relatively expensive. For this reason, development of a heat dissipating member exhibiting heat dissipation equal to or higher than that of a conventional heat dissipating member, at the same time as a light weight and low cost has been expected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and an object of the present invention is to provide a material capable of forming a light-emitting heat-radiating member excellent in heat dissipation property, and a lightweight and low-cost heat dissipating member manufactured using the material.

An embodiment of the present invention is a precoated aluminum alloy plate comprising an aluminum alloy plate, a first coating film formed on one surface of the aluminum alloy plate, and a second coating film formed on the other surface,

Wherein the first coating film has heat radiating property superior to the surface of the aluminum alloy plate,

Wherein the second coating film has an adhesive function of being melted or softened by heating to become an adhesive.

According to another aspect of the present invention, there is provided a heat dissipating member having a bottom surface portion having a bonding surface for bonding to another member and a fin portion standing upright from the bottom surface portion,

The bottom surface portion and the fin portion are formed by bending the pre-coated aluminum alloy sheet for the heat radiation member,

And the joint surface in the bottom surface portion is constituted by a surface having the second coated film.

According to still another aspect of the present invention, there is provided a heat dissipating member in which a pre-coated aluminum alloy sheet for a heat dissipating member is bent in a corrugated shape along a plurality of bending origin lines,

And a joining end for joining to another member on one end side in the forming direction of the bending origin line.

The precoat aluminum alloy plate for a heat dissipating member has a first coating layer having excellent heat dissipation property as described above and a second coating layer having the adhesion function. Therefore, the surface having the second coated film is brought into contact with another member and heated, so that the second coated film functions as an adhesive, and the heat radiating member formed using the pre-coated aluminum alloy plate for the heat radiating member is easily integrated with the other member . As a result, the heat emitted by the other member can be efficiently dissipated by utilizing the excellent heat radiation property of the first coating film in the heat radiation member formed of the precoat aluminum alloy plate for the heat radiation member.

Further, the pre-coated aluminum alloy sheet for a heat radiating member is provided with the aluminum alloy plate as a base material, and is excellent in workability and can be easily processed into a desired shape. Therefore, it can be easily processed into an optimum shape with other members (members such as an electric appliance and other electric devices) that are objects to be improved in heat radiation characteristics.

In addition, the precoat aluminum alloy plate for the heat radiation member can be applied efficiently in a large amount by using continuous lines for the coating of the first coating film and the second coating film. Therefore, it can be processed efficiently and inexpensively.

Also, the precoat aluminum alloy sheet for a heat radiating member may be used only in a form of sticking along the surface of the object while being in a plate shape. In this case, too, heat transferred from the other member can be efficiently It is possible to radiate heat.

Further, the heat radiation member of the type in which the bottom surface portion and the fin portion are formed by bending the precoat aluminum alloy sheet for the heat radiation member, the junction surface in the bottom surface portion is constituted by the surface having the second coating film as described above . Thereby, the other member and the bottom face portion can be easily integrated by using the adhesive function of the second coating film, and the state in which the fin portion is provided can be easily obtained. By the presence of the fin portion, the surface area of the first coating film can be increased, and excellent heat dissipation can be obtained.

Further, even in the case of the heat radiating member having the corrugated shape formed by bending the pre-coated aluminum alloy sheet for heat radiation member along a plurality of bending origin lines, the surface area of the first coated film can be increased and excellent heat radiation property can be obtained. Further, the heat radiating member having the joining end for joining to another member on one end side in the forming direction of the bending origin line has a large surface area on the side of the corrugated shape, and can improve heat radiation on the side surface.

Further, at the time of joining with another member, for example, the joining end of the heat dissipating member is placed on another member and heated. Thereby, the second coating film of the heat radiation member is at least partially melted or softened, and the second coating film melted or softened is spread over another member by its own weight. Further, the second coating film, which is melted or softened by curing by cooling, is hardened, and the other member and the heat radiation member can be easily bonded.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory diagram showing the configuration of a pre-coated aluminum alloy plate for a heat radiation member according to Embodiment 1. Fig.
Fig. 2 is an explanatory view showing a bent shape of the fin portion and the bottom portion of the heat radiation member in Embodiment 1. Fig.
3 is an explanatory view showing the state of the heat dissipating member as seen from the side opposite to the bottom face of the heat dissipating member in the first embodiment;
Fig. 4 is an explanatory view showing a configuration of a down-line on which a heat radiation member is mounted in Embodiment 1. Fig.
5 is an explanatory diagram showing a heat radiation member bonded to another member in Example 1. Fig.
6 is an explanatory view showing a bent shape of a fin portion and a bottom portion of a heat dissipating member in Embodiment 2. Fig.
Fig. 7 is an explanatory view showing the state of the heat dissipating member in the second embodiment as seen from the side opposite to the bottom surface. Fig.
Fig. 8 is an explanatory view showing the configuration of a down line on which a heat dissipating member is mounted in the second embodiment; Fig.
Fig. 9 is an explanatory view showing a heat radiation member adhered to another member in the second embodiment; Fig.
10 is an explanatory view showing the configuration of a down line on which a heat dissipating member is mounted in Comparative Example 1. Fig.
11 is an explanatory diagram showing the evaluation results of Examples 1 and 2 and Comparative Example 1;
12 is a perspective view of a heat dissipating member to which a base plate is bonded in the twelfth embodiment;
13 is a top view of a heat dissipating member to which a base plate according to a twelfth embodiment is bonded.
14 is a side view of a heat dissipating member to which a base plate is bonded in the twelfth embodiment;
Fig. 15 is an explanatory view enlarging and showing a partial cross section in a radial direction of a cylindrical heat radiation member in Embodiment 12. Fig.
16 is an explanatory view showing a configuration of a down line in which a heat radiation member is mounted in the twelfth embodiment;
Fig. 17 is an explanatory view showing a heat radiation member bonded to another member in the twelfth embodiment in a sectional structure; Fig.

As the material of the aluminum alloy sheet which is the base material of the precoat aluminum alloy sheet for the heat radiation member, a material suitable for forming processing such as 1000 series, 3000 series, 5000 series, 6000 series and the like can be used. For example, there are 1050, 8021, 3003, 3004, 3104, 5052, 5182, 5N01 and the like. The thickness of the aluminum alloy sheet is not particularly limited, but is preferably 0.3 mm to 1.5 mm from the standpoint of ease of manufacture and ease of processing.

In the precoat aluminum alloy sheet for a heat dissipating member, the first coating film preferably has a softening point exceeding 150 ° C, and is selected from the group consisting of a fluororesin, a urethane resin having a number average molecular weight of 10,000 to 40,000, a polyolefin resin having a number average molecular weight of 10,000 to 40,000, The first base resin comprising at least one selected from epoxy resins having a number average molecular weight of 1,000 to 15,000 and polyester resins having a number average molecular weight of 10,000 to 40,000.

That is, as the first coating film, a synthetic resin having a softening point of 150 ° C or more may be used as the base resin. This makes it possible to easily prevent the first coating film from being melted or softened even when the second coating film is heated and melted or softened. More preferably, the base resin of the first coating film has a softening point of at least 170 캜, more preferably at least 200 캜. From the viewpoint of availability, a synthetic resin having a softening point of 300 DEG C or less can be used as the base resin of the first coating film.

As the first coating film, a synthetic resin having a number average molecular weight in the above range may be used. By using a synthetic resin having a number average molecular weight in this range, it is easy to ensure the moldability of the coating film. When the number average molecular weight of each synthetic resin is less than a value determined by the lower limit, the coating film becomes hard and the moldability may be deteriorated. When the value exceeds the upper limit, there is a fear that the coating film becomes too soft and the damage resistance is lowered.

As the first coating film, a fluororesin can be used as described above, and the molecular weight of the fluororesin is not particularly limited, and an industrially available range can be employed. From the viewpoint of availability, it is preferable that the molecular weight of the fluororesin is 50,000 to 10,000,000.

As the polyolefin resin, for example, polyethylene resin, polypropylene resin and the like can be used.

The first coating film may contain one or more of titanium oxide, carbon, silica, alumina, and zirconium oxide as the heat-radiating substance. By employing these materials as the heat dissipation material, the heat radiation of the first coating film can be easily increased.

The heat radiating property of the first coating film can be evaluated by the integrated emissivity of infrared rays. For example, it is preferable that the first coating film is adjusted so that the integrated emissivity of infrared rays is 70% or more. Thereby, a stable heat radiation characteristic can be obtained. The integrated emissivity of infrared radiation can be measured by comparing the infrared radiation of a sample with an ideal black body by FT-IR. In addition, the integral emissivity of the infrared rays of the aluminum alloy sheet is generally 15 to 18%.

In the first coating layer, 0.5 to 200 parts by weight of titanium oxide having an average particle diameter of 0.1 to 100 μm, 0.5 to 25 parts by weight of carbon of fine powder, 0.5 to 200 parts by weight of silica, 0.5 to 200 parts by weight of alumina, and 0.5 to 200 parts by weight of zirconium oxide.

That is, when titanium oxide is contained in the first coating film, it is preferable that the average particle diameter is in the range of 0.1 to 100 mu m. Thereby, it is possible to suppress defects in which titanium oxide particles are separated from the first coating film and fall off, and a stable heat radiation improving effect can be obtained.

The content of titanium oxide in the first coating film is preferably 0.5 to 200 parts by weight based on 100 parts by weight of the first base resin. Thereby, it is possible to obtain a stable heat dissipation improving effect while suppressing deterioration of separation of titanium oxide particles from the first coating film.

As the carbon of the fine powder, carbon having an average particle diameter of 1 nm to 500 nm can be used. The content of carbon in the first coating film is preferably 0.5 to 25 parts by weight. Thereby, it is possible to obtain a stable heat dissipation improving effect while suppressing the defect that carbon particles separate from the first coating film and fall off.

As the silica, for example, those having an average particle diameter of 0.1 to 100 mu m can be used. The content of silica in the first coating film is preferably 0.5 to 200 parts by weight. Thereby, it is possible to obtain a stable heat dissipation improving effect while suppressing the defect that the silica particles separate from the first coating film and fall off.

As the alumina, for example, those having an average particle diameter of 0.1 to 100 mu m can be used. The content of alumina in the first coating film is preferably 0.5 to 200 parts by weight. Thereby, it is possible to obtain a stable heat dissipation improving effect while suppressing the defect that alumina particles separate from the first coating film and fall off.

As the zirconium oxide, for example, those having an average particle diameter of 0.1 to 100 占 퐉 may be used. The content of zirconium oxide in the first coating film is preferably 0.5 to 200 parts by weight. Thereby, it is possible to obtain a stable heat dissipation improving effect while suppressing the failure of the zirconium oxide particles to separate from and fall off from the first coating film.

The thickness of the first coating film may be, for example, 0.5 to 100 占 퐉.

The second coating film may contain a second base resin composed of one or more of acrylic resin, urethane resin, ionomer resin, polyolefin resin, epoxy resin and polyester resin at a softening point of 150 ° C or lower . In this case, when the softening point is set to 150 占 폚 or less, the heating in the case of exhibiting the adhesive function of the second coated film can be carried out at a relatively low temperature. The adjustment of the softening point can be easily performed by adjusting the number average molecular weight of each resin. More preferably, the second coating film has a softening point of 140 캜 or lower. The lower limit of the softening point is preferably 50 ° C or higher, more preferably 70 ° C or higher, from the viewpoint of suppressing the reaction when the precoated aluminum alloy sheet for heat radiation member is stored.

As the polyolefin resin in the second coating film, for example, a polyethylene resin, a polypropylene resin and the like may be used as the first coating film.

In addition, the second coating layer may contain a thermally conductive material in the second base resin. Here, the thermally conductive material is superior to the second base resin in thermal conductivity and can improve the thermal conductivity of the entire second coating film. By containing the thermally conductive material, heat transfer efficiency from the other member of the second coating film is improved, and the heat radiation property by the heat radiation member formed using the precoat aluminum alloy plate for the heat radiation member can be further improved.

In addition, alumina, titanium oxide, silica, carbon, or nickel may be contained as the thermally conductive material. These materials are excellent in thermal conductivity and contained in the second coating film. The alumina, titanium oxide, silica, carbon, or nickel is preferably in the form of granular or powder. The particle diameter or content of these materials is not particularly limited and may be selected within a range that does not impair the paintability of the second coating film. For example, alumina, titanium oxide, silica or nickel may have an average particle diameter of 0.1 to 100 mu m, and the content may be 0.5 to 200 parts by weight based on 100 parts by weight of the second base resin. The average particle diameter of carbon may be 10 to 100 nm, and the content may be 0.5 to 25 parts by weight based on 100 parts by weight of the second base resin.

When the thermally conductive material contained in the second coating film is nickel, for example, an Ni spherical filler having an average particle diameter of 0.3 to 100 mu m and a thickness of 0.2 to 5 mu m At least one of scale-shaped Ni fillers having a long diameter of 2 to 50 mu m can be selected.

In the heat dissipating material pre-coated aluminum alloy sheet, it is preferable that Tm ₁ -Tm ₂ ≥20 when the softening point of the first coating film is Tm ₁ 캜 and the softening point of the second coating film is Tm ₂ 캜.

When Tm ₁ -Tm ₂ <20, there is a fear that it becomes difficult to melt or soften the second coating film without softening the first coating film when the second coating film is heated and melted or softened. More preferably Tm ₁ -Tm ₂ may ≥40 this may be more preferably than Tm ₁ -Tm ₂ ≥800.

At least one of the first coating film and the second coating film may contain one or two kinds of inner waxes selected from calabasia, polyethylene, microcrystalline and lanolin. As a result, it is possible to improve the workability and the damage resistance improvement effect.

The content of the inner wax may be, for example, 0.05 to 3 parts by weight based on 100 parts by weight of each base resin. By selecting this range, it is possible to easily obtain the effect of improving the workability and the damage resistance, and it is also possible to suppress the phenomenon of the blocking that the precoated aluminum alloy plates stick to each other and do not fall off.

It is preferable that the first coating film and the second coating film are formed on a chromate or non-chromate layer of a coating type or reaction type formed on the surface of the aluminum alloy plate. In this case, the adhesion between the aluminum alloy sheet and the precoat layer can be improved, and workability and durability can be further improved. The first coating film and the second coating film may each be composed of only one layer, and the other coating film of the synthetic resin may be disposed as a base coating film in the lower layer.

In addition, pigments and dyes may be added to the first coating film and the second coating film within a range that does not impair the properties such as heat radiation, workability, and adhesion, thereby improving designability.

Next, the heat dissipating member having the bottom surface portion and the fin portion is formed by bending the precoat aluminum alloy sheet for the heat dissipating member. The heat dissipating member is not limited to the following embodiment, And can take various forms. It is preferable that only one precoat aluminum alloy sheet for heat dissipating member used for manufacturing the heat dissipating member is provided, but a plurality of sheets may be combined.

The fin portion may be formed by folding the precoat aluminum alloy plate for the heat radiating member 180 degrees so as to reach the surface of the first coating film and superimposing two sheets. Concretely, for example, as shown in Example 2 to be described later, a single pre-coated aluminum alloy sheet for a heat radiation member is used to combine 90 degrees of bending and 180 degrees of bending a plurality of times, Layered fin portions are alternately formed, and each of the bottom face portions can be arranged flat without substantially step.

In addition, since the pin portions constituted by the above-mentioned 180-degree bending come into contact with each other, the second coating films are mutually brought into contact with each other, and therefore, by heating when bonding the bonding surfaces constituted by the second coating films to the other members, And the second coating film in the fin portion is also melted or softened to exhibit an adhesive function. Therefore, it is possible to unify the pin portions overlapping each other and improve the rigidity.

Further, the fin portion may be formed by bending the pre-coated aluminum alloy sheet for heat radiation member into a corrugated shape in a single sheet without overlapping. Concretely, for example, as shown in Example 1 to be described later, by using one sheet of precoat aluminum alloy sheet for heat dissipating member and folding at 90 degrees several times, the bottom surface portion and the gap The pin portions formed by one sheet may be formed in a zigzag shape, and the bottom portions may be arranged flatly with no substantial step difference through the gap.

In the heat dissipating member having the bottom face portion and the fin portion, when the plurality of fin portions are provided, the spacing between the pins is preferably 5 mm or more in order to improve the air permeability, more preferably 8 mm or more . When the distance between the pins is not uniform, the shortest interval is preferably 5 mm or more as described above, and more preferably 8 mm or more.

In the heat dissipating member having the above-mentioned bottom face portion and the fin portion, a through hole penetrating the fin portion in the plate thickness direction can be formed in the fin portion formed of the precoat aluminum alloy plate for the heat dissipating member. In this case, the air permeability of the heat dissipating member is improved, and the heat dissipation property can be further improved.

Further, in the heat dissipating member formed by bending the pre-coated aluminum alloy sheet for heat dissipating member in a corrugated state without overlapping, the fin portion has an upstanding surface rising in a substantially vertical direction from the bottom surface portion, A top surface extending in a direction substantially parallel to the bottom surface portion and a bottom surface descending in a substantially vertical direction from the top surface to the bottom surface portion. The through hole may be formed at any of the rising surface, the top surface, and the falling surface of the fin portion.

Further, in the heat radiating member bent in a corrugated shape along a plurality of bending origin lines, the one end side in the forming direction of the bending base line may be a joining end for joining to another member.

Specifically, it is preferable that the heat dissipating member has a cylindrical shape as a whole in a state in which the bending origin lines are aligned in the axial direction, and the joining end is provided at one end in the axial direction of the tubular shape.

In this case, the surface area of the side surface of the cylindrical heat dissipating member can be increased, and the heat dissipation from the side surface can be enhanced. Further, since a space is formed inside the tubular heat radiation member, the air cooling performance can be improved.

In addition, in the case where a plurality of fin portions are provided in a heat dissipating member having a joining end on one end side in the forming direction of the bending origin, it is preferable that the interval between the fins is 3 mm or more in order to improve the air permeability . When the distance between the pins is not uniform, the shortest interval is preferably 3 mm or more, more preferably 5 mm or more as described above.

The heat dissipating member preferably has a cylindrical shape as a whole.

In this case, the pre-coated aluminum alloy sheet for heat dissipating member is bent along a plurality of bending origin lines to form a corrugated member into a tubular shape (curved), so that a tubular heat dissipating member can be simply manufactured. Further, it is easy to apply to a heat radiation member for a lighting device such as a down line, which is suitable for a cylindrical shape.

It is preferable that the heat dissipating member has a plurality of fin portions radially arranged in the radial direction of the cylindrical shape and the adjacent fin portions are alternately connected on the inner and outer circumferential sides of the cylindrical shape, It is preferable that the inner circumferential side and the outer circumferential side connecting portions of the fin portions are formed in a plane or curved surface arranged in the circumferential direction of the cylindrical shape.

In this case, the surface area of the first coating film can be increased by the presence of the fin portion, and excellent heat dissipation can be obtained. Further, a surface having excellent heat dissipation is formed in the pin portion arranged in the radial direction and the connecting portion arranged in the circumferential direction. Therefore, it is possible to promote heat radiation in multiple directions.

In addition, it is preferable that a through hole is formed in the connection portion.

In this case, the air-permeability of the cylindrical heat dissipating member can be improved.

The connection portion on the inner circumferential side constitutes the inner surface portion of the cylindrical heat radiation member and the connection portion on the outer circumferential side forms the outer surface portion of the cylindrical heat radiation member. By forming the through holes on the inner and outer surfaces as described above, the air permeability at the side surface of the cylindrical heat dissipating member is improved as described above, and the air cooling performance can be further improved.

Specifically, the through hole is a hole penetrating through the thickness direction of the precoated aluminum alloy plate constituting the heat dissipating member. One or more through holes may be provided. Preferably, through holes are provided in all of the outer peripheral side connecting portions and / or all of the inner peripheral side connecting portions.

Further, from the viewpoint of securing the heat-radiating surface in the connecting portion, it is preferable to leave at least a portion constituted by a precoated aluminum alloy plate of a planar shape or a curved surface shape at least partially in the connecting portion, even if a through hole is formed in the connecting portion Do.

The connecting portion may be formed in a plane shape or a curved shape as described above to form a through hole in the connecting portion, but the connecting portion may be formed as a line parallel to the axial direction of the cylindrical shape. That is, the pre-coated aluminum alloy plate bent in a zigzag shape may be formed as a heat radiation member in a cylindrical shape with a plurality of bending origin lines aligned in the axial direction. In this case, the connecting portion is not a plane or a curved surface but a linear shape parallel to the axial direction, and a sharp angular protruding corner portion is formed in the connecting portion.

In the case of forming the tubular heat dissipating member by using the precoat aluminum alloy plate for the heat dissipating member having the first coating film and the second coating film formed on the front and back surfaces, Or the like. This also applies to the second coating film.

It is preferable that the first coating film of the precoat aluminum alloy sheet for the heat radiation member is the outer peripheral side of the cylindrical shape and the second coating film is the inner peripheral side of the cylindrical shape.

In this case, since the first coating film having excellent heat dissipation performance is disposed on the outer circumferential side which is easy to come in contact with the outside air, the heat dissipation performance can be further improved.

Further, in the above-mentioned heat dissipating member in which the entirety is curved into a cylindrical shape, one end in the axial direction of the cylindrical shape serves as a joining end for joining to another member. The second coating film is at least partially melted or softened and the melted or softened second coating film is spread over the other member so as to be cooled . At this time, if the second coated film is arranged on the inner peripheral side of the cylindrical shape as described above, the bonded portion by the second coated film can be formed inside the cylindrical shape which is difficult to see from the outside. This makes it possible to improve the appearance after joining.

[ Example ]

(Example 1)

An example of application to a down line which is one type of lighting apparatus is shown as an example of a heat radiation member manufactured using a precoat aluminum alloy plate for a heat radiation member. As shown in Fig. 2, the heat dissipating member 5 of this embodiment includes a bottom surface portion 50 having a bonding surface 51 for bonding to another member (base member) 81 (Fig. 4) 50).

The bottom face portion 50 and the fin portion 52 are formed by bending the pre-coated aluminum alloy plate 1 for heat dissipating member shown in Fig. 1, the precoat aluminum alloy plate 1 for a heat radiating member comprises an aluminum alloy plate 10, a first coating film 11 formed on one surface thereof, and a second coating film 11 formed on the other surface thereof. And a coating film (12). The first coating film 11 has better heat dissipation than the surface of the aluminum alloy plate. The second coating film has an adhesive function of being melted or softened by heating to become an adhesive. The bonding surface 51 (FIG. 2) in the bottom surface portion 50 is constituted by the surface having the second coating film 12.

The precoat aluminum alloy sheet (1) for the heat dissipating member was produced as follows. First, a material A1050-O material having a thickness of 0.5 mm was used as the aluminum alloy plate 10 as a substrate. Both sides of the aluminum alloy 10 were degreased with an alkaline degreasing agent, and then immersed in a phosphoric acid chromate bath to perform chemical conversion treatment. The obtained chemical conversion coating (phosphoric acid chromate coating) 105 was set within the range of 20 ± 5 mg / m ² as the Cr content in the coating.

Next, a first coating film 11 was formed on one surface of the aluminum alloy plate 10. As a coating material, a polyester resin having a melting point exceeding 200 占 폚 (softening point: 240 占 폚) and having a number average molecular weight of 16000 was used as a first base resin, and as a solid content ratio, A titanium oxide having a particle diameter of 0.3 mu m was contained in an amount of 100 parts by weight and a polyethylene wax as an inner wax was contained in an amount of 1 part by weight. Coating was carried out using a bar coater, and the film thickness of the first coating film 11 was set to 50 탆. The sintering conditions of the first coating film 11 were such that the surface temperature was kept at 230 캜 for 60 seconds in an oven at 240 캜.

Next, the second coating film 12 was formed on the other surface of the aluminum alloy plate 10. [ As the coating material, a material consisting of a mixture of a 40% aqueous solution of bisphenol A epoxy resin having a number average molecular weight of 10000 and a mixture of block isocyanate and picoxide # 212 manufactured by Murakami Kagaku Kogyo Co., Ltd. in a ratio of 7: 3 was used. The coating was carried out using a bar coater, and the thickness of the second coating film 12 was set to 20 탆. The sintering conditions of the second coating film 12 were such that the surface temperature was maintained at 230 캜 for 60 seconds in an oven at 240 캜. The obtained second coating film 12 had a melting point of 170 캜 and a softening point of 85 캜. The first coating film 11 and the second coating film 12 can be painted using a continuous coating line at the time of mass production.

Using the precoated aluminum alloy sheet 1 for a heat dissipating member thus obtained, a heat dissipating member 5 was produced as follows. First, a blank material (not shown) corresponding to a shape in which the heat radiating member 5 having the final shape shown in Figs. 2 and 3 is spread in a flat plate shape is formed of a precoat aluminum alloy plate 1 for a heat radiating member.

Next, as shown in Fig. 2 and Fig. 3, the blanket member is folded at 90 degrees to form a corrugated shape, and the blanket member 50 is arranged in a substantially horizontal shape. And the inserted fin portion 52 is provided. The bottom surface portion 50 is a surface having the bonding surface 51 and the second coating film 12 on the side opposite to the side on which the fin portion 52 is formed.

As shown in Fig. 3, the heat dissipating member 5 is formed so that the outline is circular when viewed from above. As shown in Fig. 2, each of the fin portions 52 is composed of only one pre-coated aluminum alloy plate, and the interval D1 between the adjacent fin portions 52 is set to 8 mm.

The obtained heat dissipating member 5 can be used in a state in which the bottom surface portion 50 is brought into contact with another member and heated so as to be integrally joined with the other member. As a concrete configuration applied to the down line 8 which is one type of the lighting apparatus, a configuration in which the radiation member 5 is bonded to the base plate 81 as the other member as shown in Fig. It is also possible to recognize the entire combination of the base member 81 and the heat radiation member 5 as a heat radiation member.

The base member 81 is made of an aluminum alloy disk (diameter: 85 mm, thickness: 3 mm). The base member 81 and the heat dissipating member 5 are bonded to each other by placing the bonding surface 51 of the bottom surface portion 50 of the heat dissipating member 5 on the upper surface of the base member 81, The whole of the base member 81 and the heat radiation member 5 is heated to 170 DEG C and then cooled. By this heating, the second coating film 12 of the heat dissipating member precursor aluminum alloy plate 1 constituting the heat dissipating member 5 is melted or softened, and then the second coating film 12 is cured Adhesive function is demonstrated. As a result, as shown in Figs. 4 and 5, the base member 81 and the heat radiation member 5 are integrated. In addition, at the time of melting or softening the second coating film 21, a portion 127 that flows slightly to cover the surface of the base member 81 is formed.

As shown in the figure, a substrate 83 on which a light source 82 made of an LED element is mounted, and a reflector 84 for reflecting light emitted from the light source 82 in a desired direction are attached to a down- (80) is prepared separately. The base member 81 integrated with the heat dissipating member 5 is disposed on the substrate 83 of the downline body portion 80 and bonded thereto through the insulating film 85. Thereby, the down line 8 provided with the heat radiation member 5 is completed.

When the down line 8 is turned on, the light source 82 generates heat. This heat is transferred to the heat radiation member 5 through the substrate 83, the insulating film 85, and the base member 81. In the heat dissipating member 5, the heat transferring the aluminum alloy plate 10 is efficiently dissipated by the action of the first coating film 11 having excellent heat dissipation. Therefore, excessive rise of the temperature of the light source 82 in the down line 8 can be suppressed, and the lifetime can be prevented from lowering and the light emitting performance can be maintained.

(Example 2)

The radiation member 6 of this embodiment is applicable to a down-line type lighting apparatus as in the first embodiment.

As shown in Fig. 6, the heat dissipating member 6 of this embodiment includes a bottom surface portion 60 having a bonding surface 61 for bonding to another member (base member) 81 (Fig. 8) 60 formed in the base portion 62.

The bottom face portion 60 and the fin portion 62 are formed by bending the pre-coated aluminum alloy plate 1 for heat radiation member having the same constitution as that of Embodiment 1. [ 6 and 7, a blank material (not shown) corresponding to a shape in which the heat radiation member 6 of the final shape shown in FIG. 6 and FIG. 7 is spread in a flat plate shape is inserted into a precoat aluminum alloy Is formed in the plate (1).

Next, as shown in Figs. 6 and 7, a bottom surface portion 60 in which the blank material is bent in an angle of 90 degrees and a surface in which the blanks are bent 180 degrees are arranged in a substantially horizontal shape, And the inserted pin portion 62 is provided. The bottom surface portion 60 is a surface having a bonding surface 61 and a surface having the second coating film 12 on the side opposite to the side on which the fin portion 62 is formed.

As shown in Fig. 7, the heat dissipating member 6 is formed so that the outline is circular when viewed from above. As shown in Fig. 6, each of the fin portions 62 was formed by bending the precoat aluminum alloy sheet for a heat radiating member 180 degrees so that the first coating film 11 reached the surface, and superimposing two sheets. The distance D2 between the adjacent fin portions 62 was set to 8 mm.

The obtained heat releasing member 6 can be used in a state in which the bottom face portion 60 is brought into contact with another member and heated so as to be integrally joined to the other member. As a concrete configuration applied to the downline having the same configuration as that of Embodiment 1, a heat dissipating member 6 is bonded to the base plate 81 as the other member as shown in Fig. It is also possible to recognize the entire combination of the base member 81 and the heat radiation member 6 as a heat radiation member.

The base member 81 and the heat dissipating member 6 are bonded to each other by placing the bonding surface 61 of the bottom surface portion 60 of the heat dissipating member 6 on the upper surface of the base member 81, The whole of the base member 81 and the heat radiation member 6 is heated to 170 DEG C and then cooled. By this heating, the second coating film 12 of the heat dissipating member precoat aluminum alloy plate 1 constituting the heat dissipating member 6 is melted or softened, and then the second coating film 12 is cured Adhesive function is demonstrated. Thus, as shown in Fig. 9, the base member 81 and the heat radiation member 6 are integrated, and the two overlapping portions of the respective fin portions 62 are integrally joined.

8, the base member 81 integrated with the heat dissipating member 6 is bonded to the downline body portion 80 prepared separately as in Embodiment 1 through the insulating film 85 The down line 802 is completed.

The heat emitted from the light source 82 when the down line 802 is turned on is transmitted to the heat dissipating member 6 through the substrate 83, the insulating film 85, and the base member 81. [ In the heat dissipating member 6, the heat transferring the aluminum alloy plate 10 is efficiently dissipated by the action of the first coating film 11 having excellent heat dissipation. Therefore, the temperature of the light source 82 in the down line 802 can be prevented from rising excessively, and the lifetime can be prevented from lowering and the light emitting performance can be maintained.

9, the heat dissipating member 6 of the present example has a higher rigidity than that of the first embodiment because the fin portions 62 have two superposed structures. In addition, since the area of the bonding surface 61 of the bottom portion 60 is larger than that of the first embodiment, the bonding stability is also high.

Although the outer shape of the heat dissipating members 5 and 6 is circular in Embodiments 1 and 2, it is needless to say that the shape can be changed within the range of the area of the base member 81 such as a quadrangle and an octagon.

(Comparative Example 1)

As shown in Fig. 10, in order to quantitatively evaluate the effectiveness of the heat radiation members of the first and second embodiments, the base portion 81 and the heat radiation member 5 or the heat radiation member 6 And a down line 809 in which the integral portion was changed to a cast heat dissipating member 95 made of an aluminum alloy of the material ADC12 was prepared.

(evaluation)

Downline 8 (Example 1), downline 802 (Example 2), and downline 809 (Comparative Example 1) were prepared as disclosure materials 1, 2 and 3, The test piece was placed in a constant-temperature chamber at 25 ° C, and a test was performed to measure the temperature of each part at the time of lighting for one hour. Further, in order to stably measure the temperature, the publicly known materials 1, 2 and 3 were arranged in a rectangular tube (not shown) of vinyl chloride, respectively, and lighted. As shown in FIG. 4, FIG. 8 and FIG. 10, the temperature measurement position is located at the point A (the outer peripheral end of the substrate), the point B (the outer peripheral end of the base), the point C , E point (lower part of square box) and F point (upper part of square box).

The weight of the heat dissipating member in each of the specimens was measured. The weight of the heat dissipating members 5 and 6 in Examples 1 and 2 is a weight not including the base member 81. [

The results of the temperature measurement and the weight of the heat dissipating member are shown in Table 1. The measurement result of the point A is shown in Fig. 11 shows the type of the object to be measured on the horizontal axis, the temperature of the point A on the left vertical axis, and the weight of the heat radiating member on the vertical axis. The temperature of the point A is indicated by a bar graph, (O).

As can be seen from Table 1 and FIG. 11, the heat dissipating member 5 of the first embodiment and the heat dissipating member 6 of the second embodiment are light in weight compared to the conventional casting heat dissipating member 95, Is improved.

(Examples 3 to 11)

In Examples 1 and 2, the precoat aluminum alloy plate for a heat radiation member having the first coating film and the second coating film of a specific composition was shown. However, this example is different from the first and second embodiments Coat aluminum alloy plate for a heat dissipating member in which a coated film and a second coated film are formed.

The compositions of the first coating film and the second coating film formed in this example are shown in Tables 2 and 3, respectively. Examples 3 to 11 are precoated aluminum alloy sheets for heat dissipating members having the same constitution as in Example 1 except that the first coating film and the second coating film are different. A specific method of forming the first coating film and the second coating film is the same as that of the first embodiment.

In Tables 2 and 3, titanium oxide having an average particle diameter of 0.3 mu m was used as the titanium oxide, an average particle diameter of 24 nm was used as the carbon black, and an alumina filler having an average particle diameter of 4 mu m was used.

As the second base resin, "Jurima AT613" manufactured by Donga Synthetic Gene Co., Ltd., "Takerac W615" manufactured by Mitsui Chemicals, Inc. as urethane resin, and " "PES375S40" manufactured by Shin-Etsu Chemical Co., Ltd., and "Pikusa # 212" manufactured by Murakami Chemical Industries, Ltd. as block isocyanate were used.

Table 2 shows the emissivity (%) and the softening point Tm ₁ (占 폚) of the first coating film.

The emissivity of the first coating film can be measured by the integral emissivity of infrared rays. The emissivity of the aluminum alloy plate (material A1050-O material, thickness 0.5 mm) in this example is 15%.

In Table 3, the softening point Tm ₂ (° C) and the peel strength (kg / 0.5 cm ² ) of the second coating film are described.

The peel strength of the second coating film was measured according to JIS-K6854-3 &quot; Adhesive-peel adhesion strength test method: T-type peel &quot;.

Specifically, first, the aluminum alloy plate having the second coating film formed thereon was cut into a length of 10 mm width x 100 mm. The coated surface of the second coated film of the aluminum alloy plate on which the second coated film was formed and the unpainted aluminum alloy plate were overlapped with each other so that the bonded surface had a length of 50 mm and fixed with metal clips. Then, the mixture was heated at 150 DEG C for 20 minutes. The measurement was conducted by tensile testing at a tensile speed of 50 mm / min using a tensile tester, and the peel strength at that time was measured. The test temperature was 25 캜.

The softening points Tm ₁ and Tm ₂ in Tables 2 and 3 were measured according to the Vickart softening temperature (VST) test method of the plastic-thermoplastic plastics specified in JIS-K7206 (1999).

Next, the first coating film and the second coating film shown in Tables 2 and 3 were formed by the combinations shown in Table 4, and 9 types of precoated aluminum alloy plates for heat radiation members (Examples 3 to 11) were produced Respectively. A specific method of forming the first coating film and the second coating film is the same as in the first embodiment.

Then, using these precoated aluminum alloy sheets for the heat radiating members, a heat radiating member in the form of a corrugated sheet was produced as in Example 1. The temperature of the outer peripheral edge (point A) of the substrate at the point in time when the down line was set in a constant-temperature chamber having an atmospheric temperature of 25 DEG C for one hour and each of these down lines was set in the anti- As shown in Fig. The results are shown in Table 4. Table 4 also shows the results of Comparative Example 1 for comparison. In Table 4, the difference (Tm ₁ -Tm ₂ ) between the softening points of the first coating film and the second coating film is described.

As can be seen from Table 4, the heat radiation member using the precoated aluminum alloy plates of Examples 3 to 11 can exhibit an excellent heat radiation effect as compared with the conventional cast heat radiation member (Comparative Example 1). As shown in Table 3, the precoated aluminum alloy plates of Examples 3 to 11 had a second coating film having excellent peel strength. Therefore, when used as a heat dissipating member, it can be adhered to other members such as a down line base member with excellent adhesion.

Further, in this example, a heat dissipating member having a corrugated shape similar to that of the first embodiment was manufactured using the heat dissipating material precoat aluminum alloy plates of Examples 3 to 11, but in the same manner as in Example 2, The heat radiation member may be manufactured.

(Example 12)

This example is an example of a heat dissipating member having a shape different from that of the first and second embodiments. The heat dissipating member 7 of this embodiment is applicable to the down-line type lighting apparatus as in the first and second embodiments (see Fig. 12).

As shown in Figs. 12 to 14, the heat dissipating member 7 of this example is formed in a corrugated shape by bending the pre-coated aluminum alloy sheet 1 for a heat dissipating member along a plurality of bending fulcrum lines 71 . The heat dissipating member 7 has a joining end 72 for joining to the other member 81 at one end side 715 in the forming direction of the bending origin 71. The heat dissipating member 7 has a cylindrical shape as a whole in a state in which the bending origin lines 71 are aligned in the axial direction X. The heat dissipating member 7 has a connecting end portion 715 at one end 715 of the cylindrical axial direction X 72). The heat dissipating member 7 can be used by bonding the joining end 72 to the other member 81. [

The heat radiating member (7) has a plurality of fin portions (73) radially arranged in the radial direction of the cylindrical shape. In the heat dissipating member 7, the adjacent fin portions 73 are alternately connected to each other on the inner peripheral side 701 and the outer peripheral side 702 in a cylindrical shape. The connecting portions 74 and 75 of the inner circumferential side 701 and the outer circumferential side 702 of the fin portions 73 are formed in a plane arranged in the cylindrical circumferential direction. Hereinafter, the connecting portion of the inner circumferential side 701 is referred to as the inner surface portion 74, and the connecting portion of the outer circumferential side 702 is referred to as the outer surface portion 75 as appropriate.

As shown in Fig. 13, the spacing between adjacent fin portions 73 in this example is different in the radial direction, and the distance from the inner peripheral side 701 to the outer peripheral side 702 increases. The interval between the adjacent fin portions 73 becomes minimum at the inner circumferential side 701. In this example, the intervals D3 and D4 of the inner peripheral side 701 are set to be equal to each other even at the portion where the inner surface portion 74, which is the connecting portion of the inner circumferential side 701, is present. That is, the intervals between the inner peripheral side 701 of the fin portions 73 are uniform and 5 mm.

The spacing of the outer peripheral side 702 of the adjacent fin portions 73 is also uniform regardless of the presence of the outer peripheral portion 75 which is the connecting portion of the outer peripheral side 702 and is set to 8 mm in this example .

In this example, the intervals between the inner peripheral side 701 and the outer peripheral side 702 of the adjacent fin portions 73 are made uniform, but the intervals may be changed. It is preferable that the shortest interval between adjacent fin portions 73 is 3 mm or more from the viewpoint of heat dissipation.

As shown in Figs. 12 and 14, a connecting portion, that is, a flat inner surface portion 74 and an outer surface portion 75 are formed with through-holes (not shown) (740, 750), respectively. In this example, through holes 740 and 750 are provided in all the inner surface portion 74 and the outer surface portion 75. It is also possible to form a through hole in the fin portion 73. The inner surface portion 74 is provided with two through holes 740a and 740b arranged in series in the axial direction X of the cylindrical shape. Similarly, two through holes 750a and 750b arranged in series in the axial direction X are provided on the outer surface portion 75 as well. A portion constituted by the precoated aluminum alloy plate 1 is left between the through holes 740a, 740b, 750a and 750b.

The heat dissipating member 7 is formed by bending one precoat aluminum alloy plate 1 into a corrugated shape and curving the entire shape into a cylindrical shape in a state where the starting point lines of bending are aligned in the axial direction. As the precoated aluminum alloy plate 1, the precoated aluminum alloy plate 1 for heat dissipating member shown in Example 1 is used. 15, the heat dissipating member 7 includes an aluminum alloy plate 10, a first coating film 11 formed on one side thereof, and a second coating film 12 formed on the other side thereof Respectively. It is, of course, possible to form the heat radiation members having the same constitution as the present example by using the precoat aluminum alloy sheets for heat dissipating members of Examples 3 to 11 above.

In the formation of the heat dissipating member 7 of this example, a precoat aluminum alloy plate 1 (blank material) for heat dissipating members having the same constitution as that of the first embodiment is prepared and the precoat aluminum alloy plate 1 is superimposed And bent in a corrugated shape along a plurality of bending origin lines 71 in a single sheet without being bent. Next, in the pre-coated aluminum alloy sheet 1 bent in a corrugated shape, through holes 740 and 750 are previously formed in the portions to be the connecting portions 74 and 75 of the final shape (see Figs. 12 to 14) . Then, the entire shape is bent into a cylindrical shape (85 mm in diameter, 5 cm in height) with the bending starting point lines 71 aligned in the axial direction (X). At this time, the end portions in the circumferential direction can be bonded using an adhesive or the like. Further, the second coating film of the precoat aluminum alloy sheet 1 for heat radiation member is softened or melted by heating in a state in which the entire shape is bent in a cylindrical shape, and then hardened by cooling to fix the entire shape to the cylindrical shape It is possible.

15, the first coating film 11 of the precoat aluminum alloy plate 1 for a heat radiating member is a cylindrical outer peripheral side 702 and the second coating film 12 is cylindrical And is formed so as to be the inner circumferential side 701 of the inner tube 701. [ Although the first coating film and the second coating film are omitted in Figs. 12 to 14 and 16 to be described later for convenience of drawing, actually, as shown in Fig. 15, the aluminum alloy plate 10 And a first coating film 11 and a second coating film are formed on the surface, respectively.

As shown in Figs. 12 to 14, one end of the cylindrical heat dissipating member 7 in the axial direction X can be a joining end 72 to the other member 81. [0064] Fig. The joining end 72 of the heat dissipating member 7 can be used in a state of being integrally joined with the other member 81 by heating in a state in which the joining end 72 is in contact with the other member 81. [ As a concrete configuration applied to a down-line, which is one type of lighting apparatus, a configuration in which the radiation member 7 is bonded to the base plate 81 as the other member as shown in Fig. It is also possible to recognize the whole of the combination of the base member 81 and the heat radiation member 7 as a heat radiation member. In Fig. 16, the heat radiating member 7 disposed on the downline body portion 80 shows a cross-sectional view taken along the line A-A in Fig.

The base member 81 is made of a disc made of an aluminum alloy (diameter: 85 mm, thickness 3 mm), and the base member 81 and the heat dissipating member 7 are bonded to each other on the upper surface of the base member 81 with a diameter of 85 mm, Shaped heat releasing member 7 is placed in contact with one end (joining end 72) in the axial direction X and heated and cooled in the same manner as in Example 1 under a certain load . As shown in Fig. 17, the second coating film 12 of the pre-coated aluminum alloy plate 1 for heat radiation member, which constitutes the heat radiation member 7, is melted or softened by heating, 81). Thereafter, the second coating film 12 is cured by cooling down to exhibit an adhesive function. 16 and 17, the base member 81 and the heat radiation member 7 are integrated. Further, after the integration, the portion 127 of the second coating film is widened so as to cover the surface of the base member 81 (see Fig. 17).

16, the base member 81 integrated with the heat dissipating member 7 is bonded to the downline body portion 80 separately prepared as in Embodiment 1 through the insulating film 85 The down line 803 having the heat radiation member 7 is completed.

When the down line 803 is turned on, the light source 82 generates heat. This heat is transferred to the heat dissipating member 7 through the substrate 83, the insulating film 85, and the base member 81. In the heat dissipating member 7, the heat transferring the aluminum alloy plate 10 is efficiently dissipated by the action of the first coating film 11 having excellent heat dissipation. Therefore, excessive rise of the temperature of the light source 82 in the down line 803 can be suppressed, and it is possible to prevent the lifetime from being lowered and maintain the light emitting performance.

The heat dissipating member 7 of this embodiment has a joining end 72 for joining to another member at one end in the direction of forming the bending origin. As a result, the surface area of the side surface of the cylindrical shape is increased, and heat radiation from the side surface can be enhanced.

In the heat dissipating member 7, the connecting portions 74 and 75 of the inner circumferential side 701 and the outer circumferential side 702 of the fin portions 73 are formed in a plane or curved surface arranged in the cylindrical circumferential direction . Through-holes 740 and 750 are formed in the connecting portions 74 and 75, respectively. It is possible to improve the air permeability at the side surface of the heat dissipating member 7 in a cylindrical shape. Therefore, excellent heat radiation performance can be exhibited. The other effects of the heat dissipating member 7 of this embodiment are the same as those of the first embodiment.

1 Precoated aluminum alloy plate for heat dissipating member
10 Aluminum alloy plate
11 First coating
115 Fissile material
12 Second coating
125 Thermally conductive material
5, 6, and 7,
50, 60,
51 and 61,
52, 62, and 73,
8, 802, 803, 809 downline
80 Downline body
81 base member

Claims (18)

A precoat aluminum alloy plate comprising an aluminum alloy plate, a first coating film formed on one surface of the aluminum alloy plate, and a second coating film formed on the other surface,
Wherein the first coating film has heat radiating property superior to the surface of the aluminum alloy plate,
And the second coating film has an adhesive function of being melted or softened by heating to become an adhesive,
Wherein the first coating film has a softening point of more than 150 ° C and is selected from the group consisting of a fluororesin, a urethane resin having a number average molecular weight of 10,000 to 40,000, a polyolefin resin having a number average molecular weight of 10,000 to 40,000, an epoxy resin having a number average molecular weight of 1,000 to 15,000, Wherein the first base resin comprises at least one selected from the group consisting of a polyester resin,
Wherein the second coating film contains a second base resin having a softening point of 150 캜 or less and comprising one or more kinds of acrylic resin, urethane resin, ionomer resin, polyolefin resin, epoxy resin and polyester resin,
When the softening point of the first coating film to the softening point of the second coating film ℃ Tm _1, Tm ₂ to ℃, Tm ₁ -Tm ₂ ≥20, and
Wherein the second coating film contains 2 parts by weight or less (including 0) of a thermally conductive material for improving the thermal conductivity of the second coating film with respect to 100 parts by weight of the second base resin. Precoated aluminum alloy plate. delete The precoat aluminum alloy plate for a heat dissipating member according to claim 1, wherein the first coating film contains one or more of titanium oxide, carbon, silica, alumina, and zirconium oxide as the heat dissipation material. The method according to claim 1 or 3, wherein the first coating layer comprises 0.5 to 200 parts by weight of titanium oxide, 0.5 to 25 parts by weight of carbon of fine powder, 0.5 to 200 parts by weight of silica, 0.5 to 200 parts by weight of alumina, and 0.5 to 200 parts by weight of zirconium oxide,
Wherein the titanium oxide has an average particle diameter of 0.1 to 100 占 퐉. delete delete The pre-coated aluminum alloy plate for a heat dissipating member according to claim 1, wherein the thermally conductive material contains alumina, titanium oxide, silica, carbon or nickel. delete The method according to claim 1 or 3, wherein at least one of the first coating film and the second coating film contains one or two kinds of inner waxes selected from calabasia, polyethylene, microcrystalline and lanolin Precoated aluminum alloy plate for heat dissipating member. A heat dissipating member having a bottom surface portion having a joining surface for joining to another member and a fin portion extending from the bottom surface portion,
Wherein the bottom surface portion and the fin portion are formed by bending a pre-coated aluminum alloy sheet for a heat radiation member according to any one of claims 1 to 3,
And the joint surface in the bottom surface portion is constituted by a surface having the second coated film. The heat dissipating member according to claim 10, wherein the fin portion is formed by superimposing two sheets of precoat aluminum alloy sheet for heat dissipating member by 180 degrees so as to reach the surface of the first coating film. 11. The heat dissipating member according to claim 10, wherein the fin portion is formed by bending a pre-coated aluminum alloy sheet for a heat radiating member into a corrugated shape without overlapping one sheet. A heat dissipating member in which a precoat aluminum alloy sheet for a heat dissipating member according to any one of claims 1 to 3 is bent along a plurality of bending origin lines to form a corrugated shape,
And a joining end for joining to another member on one end side in the forming direction of the bending origin line. The heat dissipation member according to claim 13, wherein the heat dissipating member has a cylindrical shape in its entirety in a state where the bending origin line is aligned in the axial direction, and the junction end portion is provided at one end in the axial direction of the tubular shape absence. 15. The heat dissipating member according to claim 14, wherein the heat dissipating member has a cylindrical shape as a whole. 16. The rotary machine according to claim 15, further comprising: a plurality of fin portions radially arranged in the radial direction of the cylindrical shape; adjacent pin portions are alternately connected to each other on the inner and outer circumferential sides of the cylindrical shape; Wherein the connecting portion on the inner circumferential side and the outer circumferential side are formed as flat or curved surfaces arranged in the circumferential direction of the cylindrical shape. The heat dissipating member according to claim 16, wherein a through hole is formed in the connection portion. 16. The heat dissipating member according to claim 15, wherein the first coating film of the precoat aluminum alloy sheet for the heat radiating member is the outer peripheral side of the cylindrical shape, and the second coating film is the inner peripheral side of the cylindrical shape.

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