JP3168715B2 - Composite material, method for producing composite material, and method for producing molded composite material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite material, a method for producing a composite material and a method for producing a composite material molded article, and more particularly to, for example, a cooking utensil, particularly an appliance used in an electromagnetic heating type cooking utensil. The present invention relates to a composite material, a method for producing a composite material, and a method for producing a composite material.

[0002]

2. Description of the Related Art Conventionally, utensils used for electromagnetic heating type cooking utensils, for example, rice cooker inner pots, are made of a base plate made of a magnetic metal plate such as iron or stainless steel which generates heat and an aluminum or aluminum alloy plate which conducts heat. It is manufactured by press-forming such as deep drawing with the latter plate as the inner side (the inner surface of the inner pot is generally coated with a fluororesin to prevent sticking of cooked rice).

Conventionally, the composite plate material as the base material has been a material obtained by cladding (compositing) a magnetic metal plate and an aluminum or aluminum alloy plate by roll rolling (for example, Japanese Patent Publication No. 54-3468, Japanese Patent Publication No. 5
4-9985).

[0004] The cladding by roll rolling is suitable for mass production. However, since it was made by roll rolling, the aluminum or aluminum alloy was compressed and joined, resulting in large variations in plate thickness. This often caused cracks and wrinkles in the press forming process of the clad plate. There was a big problem in processing. In addition, adhesion of foreign matter,
There are problems such as the necessity of surface polishing or the like because cracks and the like are likely to occur, or the problem that the bonding strength of the clad is partially low and peeled off by press working.

[0005]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to improve the quality of a composite plate material, reduce a defective rate in molding, and desirably further increase mass productivity.

[0006]

Means for Solving the Problems One of the inventions of the present application is characterized in that a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate are joined by a hot uniaxial pressing (Axial Hot Pressing) method. Composite material.

Another invention of the present application relates to a method of hot uniaxial pressing of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate (Axial Hot Pr).
(Essing) method.

[0008] Still another invention of the present application is:
Hot uniaxial pressing of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate (Axial Ho)
(t Pressing) method, and the composite plate material is press-formed and / or punched and cut.

[0009] Embodiments of the present invention include at least the following. (A) Direct hot uniaxial pressing (Axial H) of each material plate of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate without intervening an intermediate layer.
The method of manufacturing a composite material according to the invention of the present application, wherein the composite material is joined by an ot pressing method.

(B) A metal layer having a melting point intermediate or equivalent to the melting point of the material plate is formed on the surface of each and / or one of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate. The method for producing a composite material according to the invention of the present application, wherein the composite material is joined by hot uniaxial pressing (Axial Hot Pressing) after being formed.

(C) a metal having an intermediate or equivalent thermal expansion coefficient between the thermal expansion coefficients of the magnetic metal plate such as iron or stainless steel and the aluminum or aluminum alloy plate and / or one of the material plates; After forming the layer, hot uniaxial pressing (AxialHot Pressin)
g) a method for producing a composite material according to the present invention, wherein the composite material is joined by a method g).

(D) The material of the metal layer formed on the surface of the material plate is any one of Cu, Al, Ni and Ag or an alloy thereof. Or (c) a method for producing a composite material.

(E) The method of forming the metal layer on the surface of the material plate is any one of plating, vapor deposition, ion vapor deposition, and immersion in molten metal, and the metal layer is in the form of a thin film or a thick film. , A method for producing a composite material as described in (b) or (c) above.

(F) The material described in (b) or (c) above, characterized in that a material plate in which a thin metal layer is clad by a simultaneous rolling method on a magnetic metal plate such as iron or stainless steel is used in advance. Of manufacturing composite materials.

(G) The surface roughness of each of one and / or one of a magnetic metal plate such as iron and stainless steel and an aluminum or aluminum alloy plate is roughened by a method such as sandblasting. , A method for producing a composite material according to (a), (b) or (c).

(H) A magnetic metal plate and an aluminum or aluminum alloy plate are hot uniaxially pressed (Axial Ho).
t Pressing), and before the composite plate is pressed and / or punched and cut, the surface of the aluminum or aluminum alloy plate is coated with a fluororesin. A method for producing the composite material molded article of the invention.

(1) One magnetic metal plate and one aluminum or aluminum alloy plate are taken as a unit set, and a plurality of the unit sets are made of a separating material having a higher melting point than any of the magnetic metal, aluminum and aluminum alloy. Stacked with intervening, hot uniaxial pressing (Axial Hot Pres
(sing) method, the method for producing a composite material according to the present invention.

(G) One magnetic metal plate and one aluminum or aluminum alloy plate each having a metal layer formed on one surface are made into a unit set, and a plurality of these unit sets are stacked without interposing a separating material. Hot uniaxial pressing (Axial H
(b) or (c), wherein the composite material is joined by an ot pressing method.

(1) The method of manufacturing a composite material according to the invention of the present application, wherein the use of the composite material is an electromagnetic cooking appliance.

(E) Axial hot pressing (Axial Hot)
(Pressing) temperature of 300 ° C. or more and 600 ° C. or less, the method for producing a composite material, a composite material, or a composite material molded product according to the above or the present invention.

(W) Hot uniaxial pressing (Axial Hot)
(Pressing) is 200 kg / cm ² or more and 1000 kg / cm ² or less, the method for producing a composite material, a composite material, or a composite material molded product according to the present invention or the present invention.

(F) Axial hot pressing (Axial Hot)
Pressing time is 10 minutes or more and 3 hours or less. The method for producing a composite material, a composite material, or a composite material molded article according to the above or the present invention, wherein

(A) Axial hot pressing (Axial Hot)
Pressing) atmosphere is reduced pressure or 10 ¹ t
The method of manufacturing a composite material, a composite material, or a composite material molded article according to the above or the present invention, wherein the vacuum is equal to or less than orr.

(T) Axial hot pressing directly without an intermediate layer
In the case of joining by the method, the preferable condition is that the temperature is 450
℃ to 600 ° C, pressure 400 kg / cm ² or more,
The method for producing a composite material according to the above (A), wherein the time is 30 minutes or more.

(D) Axial hot pressing (Axial Hot)
Pressing) the temperature is 300 ° C or more and 45
0 ° C or less, pressure 250 kg / cm ² or more, time 30 minutes
(B), (c), characterized in that the bonding is performed in more than one minute.
A method for producing the composite material according to the above.

(S) A metal layer is formed on the surface of a material plate by plating, and hot uniaxial pressing (Axial Hot P
The method for manufacturing a composite material molded product according to the above (b) or (c), wherein the bonding is performed so that the film thickness is 5 μm or more and 20 μm or less by pressing.

(T) The method for producing a composite material according to (I) above, wherein the thickness of the separating material is 3 mm or less.

(F) The method for producing a composite material as described in (i) above, wherein the separating material is in the form of a sheet, a thin plate, a knit, a cloth, or a powder.

(4) The material of the separating material is Mo (molybdenum)
Alternatively, the method for producing a composite material according to the above (1), wherein the composite material is W (tungsten), alumite, carbon, or ceramic (alumina, zirconia, silicon nitride).

(A) Hot uniaxial pressing (Axial Hot)
Pressing mold material is an iron-based alloy, ceramic, or carbon. The method for producing a composite material, a composite material, or a composite material molded article according to the above or the present invention, wherein the method is a method for producing a composite material.

(G) The composite material, the method for producing a composite material, or the composite material molded article according to the above or the present invention, wherein the joining strength is 3 kg or more as a peeling strength of the composite plate having a width of 5 mm. Manufacturing method.

(C) The method for producing a composite material molded article according to the above (l), wherein the magnetic metal plate is a ferritic stainless steel plate.

(A) The aluminum alloy plate is a Mg-Mn based aluminum alloy plate.
A method for producing the composite material described in the above.

(V) The method for producing a composite material according to the above (1), wherein the composite material has a fluorine resin coating on the surface of the aluminum or aluminum alloy other than the magnetic metal side.

Hereinafter, the present invention will be described in detail.

According to the present invention, for example, in an electromagnetic heating type cooking utensil, a magnetic metal plate such as iron or stainless steel is a material that is the outside of the vessel and serves as a heating layer for induction heating.

Further, the aluminum or aluminum alloy plate is a material which is used as the inside of the object and serves as a good heat conductive layer for diffusing the heat of the heat generating layer.

The inner surface of the object opposite to the aluminum or aluminum alloy magnetic metal plate may be coated with a fluororesin, for example, to prevent sticking during cooking. Many techniques have been disclosed for the types and coating methods of fluororesins (see, for example, Japanese Patent Application Laid-Open No. 3-57184).

The applicant of the present application has proposed a method of joining a magnetic metal plate and an aluminum or aluminum alloy plate by a hot isodirectional pressing method (Japanese Patent Application No. 3-343870 (Japanese Patent Application Laid-Open No. 5-116244)). The present invention is intended to solve the above-mentioned problems and also to solve the disadvantages.

That is, the hot isodirectional pressurization is performed by using a high-pressure container having a built-in heating mechanism and using an ultra-high pressure inert gas (mainly Ar gas).
Gas) High pressure heating in atmosphere. This is a process that gives a synergistic effect of high-temperature heating and isotropic pressure due to gas pressure to the object to be processed, and gives phenomena such as plastic working and diffusion of constituent components to the material constituting the object to be processed.

The advantage of the hot isostatic pressing method is that a clad sheet material can be obtained by the hot isodirectional pressing method without using the roll rolling conventionally used in the field of the composite sheet material, and the diffusion is achieved. The greatest feature is that a magnetic metal plate such as iron or stainless steel is directly clad with an aluminum or aluminum alloy plate without any intervening metal layer.

However, the disadvantage of this hot isostatic pressurization method is that the operation cost of the equipment is high because high-pressure gas is used,
In addition, a disposable metal capsule is required, and it takes a considerable amount of time to vacuum-enclose the capsule and remove the capsule, resulting in an increase in cost.

In the present invention, instead of the above-mentioned hot isostatic pressing method, hot uniaxial pressing (Axial Hot Pressing) is used.
The magnetic metal plate and the aluminum or aluminum alloy plate are joined by the ng) method. Axial hot pressing is itself known. Conventionally, in order to sinter powder materials such as ceramics at a high density, this method puts the material powder in a mold consisting of a die and a punch, and simultaneously applies temperature and uniaxial pressure using a device equipped with a heating furnace and a hydraulic press. Things. In the present invention, a material plate (a magnetic metal plate and an aluminum or aluminum alloy plate) and a separating material are laminated in multiple layers in a portion where a powder raw material enters, and this is subjected to hot uniaxial pressing (Axial Ho).
t Pressing) and joining. FIG. 2 schematically shows this, in which 11 is a laminated portion of the material plate and the separating material, 12 is a furnace body, 13 is a heater, 14 is a mold (die), 15 is a mold (punch), 16 is a hydraulic device, 17 is a vacuum pump, 18 is a thermocouple, and 19 is a heat insulating material.

Axial Hot Press (Axial Hot Press)
According to the pressing method, since high-pressure gas is not used, equipment costs and equipment operation costs are low, and capsules are unnecessary, and the mold can be used repeatedly. The pressurization and decompression by the hydraulic pump are quicker than the gas pressurization by the compressor, and the cycle time can be shortened. It has been found that even with this simple hot uniaxial pressing method, diffusion occurs between bonding metals or via an intermediate layer metal, and practically sufficient bonding strength can be obtained. Further, there is almost no decrease in the thickness of the plate, so that the variation in the thickness of the plate is extremely small, and there is no occurrence of adhesion of foreign matter and flaws. In addition, the present inventors have found that the bonding is stronger than before without any extremely weak portions, and that it can withstand press working.

Hot uniaxial pressing (Axial Hot Pr)
Although the atmosphere of the essing) method can be used in the air or in a non-oxidizing gas (Ar, N ₂ , He, CO _2, etc.), the interposition of gas molecules at the bonding interface is reduced, and the bonding metal Reduce pressure or 10 ¹ torr to promote diffusion
A vacuum atmosphere of r or less is desirable. It is found that the degree of vacuum is preferably as high as possible, but economically, a sufficiently practical adhesive strength can be obtained even with a degree of vacuum of about 10 ² torr, which can be easily obtained with a rotary pump or the like.

Hot uniaxial pressing (Axial Hot Pr)
The temperature condition of the essing) method is 300 ° C. or more and 6
It is desirably 00 ° C or less. If the temperature is lower than 300 ° C., the diffusion of metal atoms between the metals to be bonded or the metal atoms in the intermediate layer becomes insufficient, and a sufficient bonding force cannot be obtained. On the other hand, if the temperature exceeds 600 ° C., the aluminum or aluminum alloy plate undergoes crystal grain growth, which causes problems such as a decrease in strength and a rough surface in the drawing process.

Desirable conditions when joining directly by an axial hot pressing method without an intermediate layer are as follows: a temperature of 450 ° C. or more and 600 ° C. or less, a pressure of 400 kg / cm ² or more, The time is 30 minutes or more. The temperature suitable for the interdiffusion between Al atoms and Fe, Ni, Cr atoms is slightly higher, and the pressure is preferably higher. This is presumed to be due to the need to diffuse aluminum or aluminum alloy through the surface oxide layer of the magnetic metal plate.

A metal such as Cu, Ni, Al or the like is interposed as an intermediate layer, and hot uniaxial pressing (Axial Hot Pr) is performed.
Desirable conditions for joining by the essing) method are a temperature of 300 ° C. to 450 ° C. and a pressure of 250K.
g / cm ² or more and time is 30 minutes or more. Cu, N
When a metal such as i, Al or the like is formed on the surface of a material metal by plating or the like and then hot uniaxial pressing is performed, the intermediate layer is formed of a magnetic metal plate and aluminum or aluminum even at a relatively low temperature and a low pressure side. It is presumed that it diffuses into both alloy sheets and plays a role of joint. If the temperature is too high, it is assumed that the intermediate layer is excessively diffused and disappears, and the bonding strength is reduced. Also, the formation of brittle intermetallic compounds is undesirable.

Axial hot pressing (Axial Hot Pr)
As described above, the pressure condition of the essing) method fluctuates depending on the condition, but is 200 kg / cm ² or more.
An appropriate range is less than 1000 kg / cm ² . It takes uneconomical time to achieve sufficient diffusion at low pressure, and excessive high pressure can cause uneconomical equipment and unnecessary deformation of aluminum or aluminum alloy plate (thinning). And make demolding difficult.

Axial Hot Press (Axial Hot Press)
The feature of the joining by the pressing method is that a practical joining strength can be obtained by optimizing the conditions regardless of the presence or absence of the intermediate layer. The intermediate layer has the advantage that the joining conditions can be shifted to lower temperatures and lower pressures, and that under the optimal conditions, a significantly higher joining strength can be obtained. In this regard, the selection of the material of the intermediate layer is important.

As a result of various studies on the material of the intermediate layer, Cu,
Ni, Al, Ag, etc. were found to be suitable. Originally,
The values of the diffusion coefficients of these metals with a magnetic metal plate or an aluminum or aluminum alloy plate are not sufficiently clarified even in literatures. However, it is clear that the melting points of these metals all have intermediate (including equivalent) melting points between the magnetic metal plate and aluminum or aluminum alloy. (Here, "equivalent" means that an aluminum or aluminum alloy layer is formed on a magnetic metal plate before joining. The same applies hereinafter.)

Matching in terms of the coefficient of thermal expansion of the intermediate layer is also important. The difference in the coefficient of thermal expansion between the magnetic metal plate and aluminum or aluminum alloy is large and nearly double.
Therefore, even when joined at a high temperature, stress is generated at the interface at the time of cooling, and there is a tendency for peeling to occur. Each of the above metals in the intermediate layer has a thermal expansion coefficient intermediate (including equivalent) between the magnetic metal plate and aluminum or aluminum alloy, and the presence of these at the interface reduces the stress at the interface. It is presumed that the bonding was relaxed and the bonding strength in the hot uniaxial pressing method was improved.

The method of forming the intermediate metal layer on the surface of the material plate in advance includes a wet method (plating, paste application, etc.), a dry method (vacuum vapor deposition, ion vapor deposition, sputtering, etc.), thermal spraying, and melting. It is possible by metal immersion or the like. In the plating method, metals such as Cu, Ni, and Ag are relatively inexpensively reduced to several μm.
A film having a thickness of m to several tens μm can be formed.
In a dry method such as vacuum evaporation or ion evaporation, a metal film (several μm) of Al, Cu, Ni, Ag, etc. having good purity and adhesion is used.
To several tens of μm) can be formed without pollution. A relatively thick coating can also be formed by attaching a molten metal to the surface, such as by spraying or immersing the molten metal.

In any case of forming the intermediate metal layer by any of the above methods, it is necessary to sufficiently clean the surface of the material plate on which the film is to be formed by cleaning or the like in advance so as not to contaminate impurities. It is effective for improving the adhesion. In the case of plating, it is desirable to include a step of removing oxides on the surface in advance. Also in the case of vapor deposition, the surface is preferably cleaned in advance by means such as glow discharge.

Furthermore, the surface roughness of the surface of each of the magnetic metal plate and the aluminum or aluminum alloy plate and / or one of the material plates can be made rough by means such as sandblasting to improve the adhesion of the intermediate layer and improve the intermediate layer. Even in the case of direct bonding without forming a layer, it is effective for improving the bonding strength. This is because, together with the cleaning effect of the surface, the hot pressing of the intermediate layer and / or the joining partner is performed by an axial hot press.
ing).

As described above, in addition to the method of forming the coating of the intermediate layer on the surface of the raw material plate, a thin metal layer to be used as the intermediate layer is previously formed on a magnetic metal plate such as iron or stainless steel by the simultaneous rolling method. May be used. For example,
A clad material made of a simultaneous rolling method such as Cu / stainless steel is commercially available. If a material obtained by punching the material into a disk shape is used as a material plate, plating and vapor deposition can be performed without plating.
It can be subjected to hot uniaxial pressing as it is.

Further, hot uniaxial pressing (Axial Hot)
The present inventors have found that the following method is effective as a method for adapting the joining by the pressing method to inexpensive and efficient mass production.

That is, when joining by the hot uniaxial pressing method, one magnetic metal plate and one aluminum or aluminum alloy plate are used as a set of units, and a plurality of these sets of units are used as a magnetic metal, aluminum or aluminum alloy. Are stacked in a predetermined mold and subjected to hot uniaxial pressing with a separating material having a higher melting point than any one of the above. A high melting point means that the material has a low diffusion coefficient as described above. Even when the diffusion coefficient is small and hot uniaxial pressing is performed, it does not react with any of the magnetic metal, aluminum or aluminum alloy, and works effectively as a separating material.

According to the above, a plurality of sets of units can be clad and taken out for each set of units due to the presence of the separating material.

As the separating material, for example, a sheet-like material such as a ceramic sheet of alumina or the like, a carbon sheet or the like, a knitted material such as a glass cloth or the like, a cloth-like material, or a powder-like material can be used. . Even if the material of the separating material is Mo (molybdenum), W (tungsten), alumite, carbon, or ceramic (alumina, zirconia, silicon nitride), it is effective as a separating material.

It is necessary that the thickness of the separating material is 3 mm or less, as thin as possible, and high in durability. Thick separators are not economically desirable because they result in a reduction in the number of blanks stacked in the mold during hot uniaxial pressing. Also, materials that are too thin or of low strength are disposable and are not economically desirable.

When a material plate having an intermediate metal layer formed on one side is used, one magnetic metal plate and one aluminum or aluminum alloy plate are laminated as a unit so as to enclose the intermediate metal layer inside. can do. in this case,
When hot uniaxial pressing is performed at a relatively low temperature side (300 to 400 ° C.), a plurality of unit sets can be clad and taken out for each unit set without using a separating material.

Axial hot pressing (Axial Hot Pr)
The dies of the pressing mold of essing) are designed so that the material plate and the separating material stacked inside the
Serve as a guide. On the other hand, since the upper and lower punches transmit the high pressure of the hydraulic cylinder to the material plate, a material that can withstand high temperature and high pressure is required. For example, an iron-based heat-resistant alloy, ceramic, or carbon is suitable.

Axial hot pressing (Axial Hot Pr)
For the joining strength of the essing) method, optimum conditions can be selected according to the application and required characteristics. However, in general, when deep drawing is required in a post-process of an electromagnetic heating cooker, a width of 5 mm is required.
It was confirmed that the peel strength of the composite board having a thickness of 3 kg or more was the minimum strength at which problems such as peeling did not easily occur.

In the present invention, when a ferritic stainless steel plate is used as the magnetic metal plate, heat can be generated by an electromagnetic induction heating method, and the magnetic metal plate is used as an inner pot of an electromagnetically heated jar rice cooker or an electromagnetic cooking utensil. I can do it.

In the present invention, if an Ag-Mn-based aluminum alloy plate is used as the aluminum alloy plate, a vessel having excellent corrosion resistance can be obtained.

[0066]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a simplified vertical sectional front view for explaining an embodiment of the present invention. In the figure, 1 is a magnetic metal plate such as iron or stainless steel, 2 is an aluminum or aluminum alloy plate, 3 is a separating material having a melting point higher than any of magnetic metal, aluminum and aluminum alloy, and 4 is hot uniaxial pressing (Axial) Hot
Pressing die and punch are shown.

Example 1 Aluminum 2 was made of JIS 3004 aluminum alloy MG-110 (manufactured by Sumitomo Light Metal) (Mg 0.6 to 0.8).
Mn 0.9-1.1%), size 1.5mm thick,
A circle plate of 425 mmφ is used, and the stainless steel 1 has a thickness of 0.5 mm and 425 mmφ. SUS430 circle plate was used. After washing the surface with alkali, 10 sheets were alternately laminated. A carbon thin plate 3 was used as a separating material between a set of one aluminum plate and one stainless plate as a unit of the composite plate material.

This is put into a set of a die made of carbon as a set, a punch is put therein, and the whole die is subjected to hot uniaxial pressing (Axial).
(Hot Pressing) apparatus. While evacuating the vacuum furnace to a degree of vacuum of 5 × 10 ² ,
The temperature of the furnace was raised to 500 ° C., a pressure of 500 kg / cm ² was increased by operating a hydraulic device, and the pressure was maintained for 2 hours.
The temperature has dropped. Thus, an aluminum / stainless steel laminated plate was obtained.

The aluminum / stainless steel joint strength is 5 m.
With a width of 3 to 7 kg and a width of 3 to 7 kg, unlike the clad material obtained by the conventional rolling, there was no portion where the joining strength was extremely low, and uniform and stable joining strength was exhibited. The thickness (t) of one sheet was 2.0 mm, and no change in the thickness due to joining was observed. Also, there was no adhesion of foreign matter and no flaw.

The aluminum surface was subjected to electrolytic etching in an aqueous NaCl solution with an electric quantity of 20 coulombs / cm ² to provide fine irregularities on the surface, and a fluororesin dispersion was applied to the surface and baked. This covering plate is pressed with a hydraulic press to a depth of 14
It was processed into a rice cooker inner pot shape having a diameter of 6 mm and an inner diameter of 221 mm to obtain a vessel of the present invention. There were no wrinkles, etc., on the objects.

Examples 2 to 35 In the same manner as in Example 1, the material plate was subjected to various surface treatments, or was subjected to hot uniaxial pressing (Axial H).
The results of evaluating the bonding strength and deep drawability when changing the temperature, pressure, and time conditions of the
The results are shown in Tables 1, 2, 3, and 4 below in Example 2. at the same time,
Table 4 also shows some comparative examples in which sufficient bonding strength could not be obtained.

[0072]

[Table 1]

[0073]

[Table 2]

[0074]

[Table 3]

[0075]

[Table 4]

Although the invention of the present application has been mainly described with reference to the electromagnetic heating type cooking utensil, the invention of the present application is by no means limited to these, and can be widely applied to the production of composite material molded products.

[0077]

As described above, according to the present invention,
There is no occurrence of cracks, wrinkles, peeling of the composite plate, etc. of the press-formed product, and the defect rate is extremely reduced. Further, when a plurality of sets serving as a base material are simultaneously subjected to hot uniaxial pressing by using a separating material, mass production can be performed and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a view for explaining an embodiment of the present invention, and is a simplified vertical sectional front view of a main part when a plurality of sets of base materials are simultaneously manufactured.

FIG. 2 Axial Hot Pres
(sing) method.

[Explanation of symbols]

 Reference Signs List 1 magnetic metal such as iron and stainless steel 2 aluminum or aluminum alloy plate 3 separating material 4 type (die) 5 type (punch)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masahiro Miyamoto 950 Noda, Kazatori-cho, Sennan-gun, Osaka Prefecture Sumitomo Electric Industries, Ltd. Kumatori Works (56) References JP-A-5-77353 (JP, A) (58) ) Field surveyed (Int. Cl. ⁷ , DB name) B23K 20/00 A47J 27/00 A47J 36/02 B32B 15/01 WPI / L (QUESTEL)

Claims (14)

(57) [Claims] 1. A hot uniaxial pressing (A) of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate.
A composite material joined by a xial hot pressing (xial hot pressing) method. 2. A hot uniaxial pressing (A) of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate.
(xial Hot Pressing) method. 3. A hot uniaxial pressing (A) of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate.
(xial Hot Pressing) method, and the composite plate material is subjected to press molding and / or punching and cutting. 4. A material plate of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate,
Direct hot uniaxial pressing (Axi
3. The method according to claim 2, wherein the bonding is performed by an al hot pressing method. 5. A metal layer having a melting point in the middle of or equivalent to the melting point of the material plate formed on a surface of each of a material plate of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate. 3. The method according to claim 2, wherein the bonding is performed by an axial hot pressing method. 6. A metal layer having a thermal expansion coefficient intermediate or equal to the thermal expansion coefficient of a material metal plate such as iron or stainless steel and / or one or more material plates of aluminum or an aluminum alloy plate. After forming, hot uniaxial pressing (Axial Hot Pressing)
3. The method for producing a composite material according to claim 2, wherein the joining is performed by a method. 7. The composite material according to claim 5, wherein the material of the metal layer formed on the surface of the material plate is one of Cu, Al, Ni, and Ag, or an alloy thereof. Manufacturing method. 8. A method for forming a metal layer on the surface of a material plate by plating, vapor deposition, ion vapor deposition, or immersion in molten metal, wherein the metal layer is in a thin film or thick film state. A method for producing a composite material according to claim 5. 9. The composite material according to claim 5, wherein a material plate in which a thin metal layer is clad by a simultaneous rolling method on a magnetic metal plate such as iron or stainless steel is used in advance. Production method. 10. The surface roughness of each of one and / or one of a magnetic metal plate such as iron and stainless steel and an aluminum or aluminum alloy plate is roughened by sandblasting or the like. A method for producing a composite material according to claim 4, 5 or 6. 11. An axial hot pressing of a magnetic metal plate and an aluminum or aluminum alloy plate.
The surface of the aluminum or aluminum alloy plate is coated with a fluororesin before the composite plate is pressed and / or punched or cut after joining by a pressing method. A method of manufacturing a composite material. 12. A unit set of one magnetic metal plate and one aluminum or aluminum alloy plate, and a plurality of the unit sets are interposed with a separating material having a higher melting point than any of the magnetic metal, aluminum and aluminum alloy. Axial Hot Press (Axial Hot Press)
3. The method according to claim 2, wherein the bonding is performed by an ing method.
A method for producing the composite material according to the above. 13. A unit set of one magnetic metal plate and one aluminum or aluminum alloy plate having a metal layer formed on one side, and a plurality of the unit sets are stacked without interposing a separating material, Uniaxial pressurization (Axial Ho
7. The method for producing a composite material according to claim 5, wherein the joining is performed by a (t Pressing) method. 14. The method of manufacturing a composite material according to claim 3, wherein the use of the composite material is an electromagnetically heated cooking appliance.