JPH0615465A - Composite material, composite material manufacturing method, and composite material molded article manufacturing method - Google Patents

Abstract

PURPOSE:To improve the quality of a composite plate material and to reduce a defective ratio for forming by joining a magnetic metallic plate and an Al alloy plate by a hot uniaxial pressurizing method. CONSTITUTION:An aluminum plate 2 of 1.5mm thick and 425mm diameter, and a stainless steel disk 1 of 0.5mm thick and 425mm diameter are washed by alkali and 10 peaces each thereof are laminated alternately. Between one piece of Al plate and one piece of SUS plate which become a unit of a composite plate material, a carbon sheet 3 is used as a dispersing material. It is set and put into a die 4 made of carbon, and by putting a punch 5 therein, the whole mold is set to a vacuum furnace of a hot uniaxial pressurizing device. While forming a vacuum in the vacuum furnace to a degree of vacuum of 5X10<2>, the furnace is allowed to raise the temperature to 500 deg.C, and hydraulic force of 500kg/cm<2> is operated on the lever 5, and held for two hours, and thereafter, pressure is reduced and the temperature is allowed to fall. In such a way, an aluminum/stainless steel stuck plate is manufactured.

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 manufacturing a composite material, and a method for manufacturing a composite material molded article, and more specifically, for example, a utensil used for a cooking appliance, particularly an electromagnetic heating cooker The present invention relates to a composite material, a method for manufacturing a composite material, and a method for manufacturing a composite material molded article.

[0002]

2. Description of the Related Art Conventionally, appliances used for electromagnetic heating type cooking utensils, for example, rice cooker inner pots, have a base material of a composite plate material of a magnetic metal plate such as iron or stainless steel that generates heat and an aluminum or aluminum alloy plate that transfers heat. This is manufactured by press forming such as deep drawing with the latter plate inside (in general, the inner surface of the inner pot is coated with a fluororesin to prevent sticking of the cooked rice).

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

The roll-rolled cladding is suitable for mass production. However, since it was made by roll rolling, the thickness of the aluminum or aluminum alloy is compressed and joined, which causes a large variation in the plate thickness, which often causes cracks or wrinkles during the press forming of the clad plate. There was a big problem in processing. Furthermore, the adhesion of foreign matter,
There were problems such as scratches that were likely to occur and surface polishing was necessary, or there were some cases where the joint strength of the clad was weak, causing problems such as peeling during press working.

[0005]

In view of the above, the present invention has an object to improve the quality of the composite plate material, reduce the defective rate in the forming process, and desirably increase the mass productivity.

[0006]

Means for Solving the Problems One of the features of the present invention is 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. It is a composite material.

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

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-molded and / or punched and cut.

Note that at least the following is included as an embodiment of the invention of the present application. (A) Direct uniaxial pressing (Axial H) of each material plate of a magnetic metal plate such as iron and stainless steel and an aluminum or aluminum alloy plate without an intermediate layer.
The method for producing a composite material according to the invention of the present application, characterized by joining by an ot Pressing method.

(B) A metal layer having a melting point intermediate or equal to the melting point of the material plate is formed on the surface of each of the magnetic metal plates such as iron and stainless steel and the aluminum or aluminum alloy plate and / or one of the material plates. After the formation, the method for producing the composite material of the invention of the present application is characterized by joining by a hot uniaxial pressing (Axial Hot Pressing) method.

(C) A metal having a coefficient of thermal expansion that is intermediate or equal to the coefficient of thermal expansion of the material plate on the surface of each / or one of the magnetic metal plates such as iron and stainless steel and the aluminum or aluminum alloy plate. After forming the layer, hot uniaxial pressing (Axial Hot Pressin
g) The method for producing a composite material according to the invention of the present application, which is characterized by joining by the method.

(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, (b) of the second invention. Alternatively, the method for producing the composite material according to (C).

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

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

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

(H) Hot magnetic uniaxial pressing (Axial Ho) between the magnetic metal plate and the aluminum or aluminum alloy plate.
of the above-mentioned present invention, characterized in that the surface of the aluminum or aluminum alloy plate is coated with a fluorine resin before the composite plate material is press-formed and / or punched and cut after being joined by the t pressing method. The manufacturing method of the composite molded article of the invention.

(I) One magnetic metal plate and one aluminum or aluminum alloy plate are set as a unit set, and a plurality of the unit sets are separated by a separating material having a melting point higher than that of magnetic metal, aluminum or aluminum alloy. Stacked by interposing, hot uniaxial pressing (Axial Hot Pres
The method for producing a composite material according to the invention of the present application, wherein the composite material is joined by a sing method.

(E) One magnetic metal plate having a metal layer formed on one side and one aluminum or aluminum alloy plate as a unit set, and a plurality of this unit set are stacked without interposing a separating material, Hot uniaxial pressurization (Axial H
The method for producing a composite material according to the above (b) or (c), characterized by joining by an ot Pressing method.

(L) The method for producing a composite material molded article according to the invention of the present application, wherein the application of the composite material molded article is an electromagnetic cooking device.

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

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

(F) Hot uniaxial pressing (Axial Hot
The pressing time of (Pressing) is 10 minutes or more and 3 hours or less, The composite material, the method for manufacturing a composite material, or the method for manufacturing a composite material molded article according to the above-mentioned or invention.

(Yo) Hot uniaxial pressurization (Axial Hot
The atmosphere of Pressing) is reduced pressure or 10 ¹ t.
A composite material, a method for manufacturing a composite material, or a method for manufacturing a composite material molded article according to the present invention or the invention, characterized in that the vacuum is at or or less.

(A) Direct hot uniaxial pressing (Axial Hot Pressing) without interposing an intermediate layer
The desirable conditions for joining by
℃ or more and 600 ℃ or less, pressure is 400 Kg / cm ² or more,
Time is 30 minutes or more, The manufacturing method of the composite material of said (a) characterized by the above-mentioned.

(R) Hot uniaxial pressurization (Axial Hot
Temperature is 300 ° C or higher by the Pressing method 45
0 ° C or less, pressure is 250 Kg / cm ² or more, time is 30
The above (b) and (c) characterized by joining for more than a minute
A method for manufacturing the described composite material.

(So) A metal layer is formed on the surface of the material plate by a plating method, and hot uniaxial pressing (Axial Hot P
The method for producing a composite material molded article according to (b) or (c) above, wherein the film thickness is bonded to 5 μm or more and 20 μm or less by means of pressing.

(T) The method for producing a composite material as described in (1) above, wherein the thickness of the separating material is 3 mm or less.

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

(D) The material of the separating material is Mo (molybdenum)
Alternatively, it is W (tungsten), alumite, carbon, or ceramics (alumina, zirconia, silicon nitride), and the method for producing a composite material according to the above (i).

(A) Hot uniaxial pressing (Axial Hot
The pressurizing mold material is a ferrous alloy, ceramic, or carbon. The composite material, the method for manufacturing the composite material, or the method for manufacturing the composite material molded article according to the above or the invention.

(M) The joint strength is a peel strength of a composite plate having a width of 5 mm, which is 3 Kg or more. The composite material according to the present invention or the invention, the method for producing the composite material, or the composite material molded article. Manufacturing method.

(C) The method for producing a composite material molded article as described in (l) above, 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 molded article according to claim 1.

(B) The method for producing a composite material molded article according to (l) above, wherein the composite material molded article has a fluororesin coating on the surface of aluminum or aluminum alloy that is not on the magnetic metal side.

The present invention will be described in detail below.

In 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 container and serves as a heat generating layer for induction heating.

The aluminum or aluminum alloy plate is a material for the inner side of the container and serves as a good heat conducting layer for diffusing the heat of the heat generating layer.

The inner surface of the container opposite to the magnetic metal plate made of aluminum or aluminum alloy may be coated with a fluororesin in order to prevent sticking of rice, for example. Many techniques have already been disclosed regarding the type of fluororesin and the coating method (see, for example, JP-A-3-57184).

The applicant of the present application has proposed a method for joining a magnetic metal plate and an aluminum or aluminum alloy plate by a hot isostatic pressing method (Japanese Patent Application No. 3-343870). It also eliminates this drawback.

That is, the hot isostatic pressing is performed by using a high-pressure container having a built-in heating mechanism and using an ultrahigh-pressure inert gas (mainly Ar gas).
High pressure heating in gas atmosphere. As a result, the object to be processed is given a synergistic effect of high temperature heating and isotropic pressure due to the gas pressure, and the material constituting the object to be processed is subjected to phenomena such as plastic working and diffusion of constituent components.

The advantage of this hot isostatic pressing method is that it is possible to obtain a clad plate material by this hot isostatic pressing method instead of the roll rolling which has been conventionally adopted in the field of this kind of composite plate material. Its main feature was to clad a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate directly without interposing a metal layer.

However, the disadvantage of this hot isostatic pressing method is that the operating cost of the equipment is high because high pressure gas is used.
In addition, a disposable metal capsule is required, and it takes a lot of time and effort to enclose the capsule in a vacuum and remove the capsule, which causes a cost increase.

In the present invention, instead of the hot isostatic pressing method described above, hot uniaxial pressing (Axial Hot Pressure) is used.
ng) method, the magnetic metal plate and the aluminum or aluminum alloy plate are joined together. By the way, the hot uniaxial pressing (Axial Hot Pressing) method itself is known. In this method, powdered raw materials such as ceramics are conventionally sintered at high density, so the raw material powders are put into a mold consisting of a die and a punch, and temperature and uniaxial pressure are applied simultaneously by a device equipped with a heating furnace and hydraulic press. It is a thing. In the present invention, conventionally, a material plate (a magnetic metal plate and an aluminum or aluminum alloy plate) and a separating material are laminated in a plurality of layers in a portion where a powder raw material is inserted, and this is hot uniaxially pressed (Axial Ho).
t Pressing) and joining. FIG. 2 shows an outline of this, in which 11 is a laminated portion of a material plate and a separating material, 12 is a furnace body, 13 is a heater, 14 is a mold (mill), 15 is a mold (punch), 16 is a hydraulic device, Reference numeral 17 is a vacuum pump, 18 is a thermocouple, and 19 is a heat insulating material.

Book, hot uniaxial pressing (Axial Hot
According to the Pressing method, since high pressure gas is not used, the facility cost and facility operating cost are low, and there is an advantage that the capsule is unnecessary and the mold can be repeatedly used. Compared to gas pressurization by compressor, pressurization and depressurization by hydraulic pump are quicker and cycle time can be shortened. It has been found that even by this simple hot uniaxial pressing method, diffusion occurs between the joining metals or through the metal in the intermediate layer, and practically sufficient joining strength can be obtained. In addition, there is almost no reduction in the plate thickness, so the variation in the plate thickness is extremely small, and no foreign matter is attached or scratches occur. Furthermore, the inventors of the present invention have found that the bonding is stronger than before without any extremely weak joints and can withstand press working.

Hot Uniaxial Pressurization (Axial Hot Pr
Although the atmosphere of the essing method can be in the air or in a non-oxidizing gas (Ar, N ₂ , He, CO _2, etc.), the presence of gas molecules at the bonding interface is reduced, and In order to promote diffusion, decompression or 10 ¹ torr
A vacuum atmosphere of r or less is desirable. It is preferable that the degree of vacuum is as high as possible, but economically, it has been found that a sufficiently practical adhesive strength can be obtained even at a degree of vacuum of about 10 ² torr, which can be easily obtained by a rotary pump or the like.

Hot uniaxial pressing (Axial Hot Pr
The temperature condition of the essing method is 300 ° C. or higher 6
A temperature of 00 ° C or lower is desirable. If the temperature is lower than 300 ° C., the atomic diffusion of the metal atoms in the metals to be joined or the metal atoms in the intermediate layer is insufficient, and a sufficient joining force cannot be obtained. On the other hand, if the temperature exceeds 600 ° C., the aluminum or aluminum alloy plate causes crystal grain growth, resulting in problems such as strength reduction and roughening in the drawing process, which is not preferable.

Desirable conditions for directly joining by the hot uniaxial pressing (Axial Hot Pressing) method without interposing an intermediate layer are as follows: the temperature is 450 ° C. or higher and 600 ° C. or lower, the pressure is 400 Kg / cm ² or higher, The time is over 30 minutes. The temperature suitable for the mutual diffusion of Al atoms and Fe, Ni, Cr atoms is slightly high, and the pressure is suitable on the high pressure side. This is presumably because diffusion is required through the surface oxide layer of aluminum or aluminum alloy and the magnetic metal plate.

Hot uniaxial pressing (Axial Hot Pr) is performed by interposing a metal such as Cu, Ni or Al as an intermediate layer.
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 or Al is formed on the surface of the material metal by a method such as plating and then hot uniaxial pressing is performed, the intermediate layer is a magnetic metal plate and aluminum or aluminum even at a relatively low temperature and low pressure side. It is presumed that it diffuses to both sides of the alloy plate and plays a role of joint. If the temperature is too high, it is presumed that the intermediate layer diffuses too much and disappears, and the joint strength decreases. Also, the formation of brittle intermetallic compounds is not desirable.

Hot Uniaxial Pressurization (Axial Hot Pr
As described above, the pressure condition of the essing method varies depending on the condition, but is 200 Kg / cm ² or more,
It can be said that an appropriate range is less than 1000 Kg / cm ² . It takes uneconomical time to cause sufficient diffusion at low pressure, and excessive high pressure causes uneconomical equipment and unnecessary deformation (thinning) of aluminum or aluminum alloy plate. And make it difficult to demold.

Book, hot uniaxial pressurization (Axial Hot
The characteristic of the bonding by the Pressing method is that practical bonding strength can be obtained by optimizing the conditions regardless of the presence or absence of the intermediate layer. The intermediate layer has the advantage of shifting the welding conditions to low temperature and low pressure side, and under the optimum conditions, a significantly higher joining strength can be obtained. In this respect, selection of the material for the intermediate layer is important.

As a result of various studies on the material of the intermediate layer, Cu,
It has been found that Ni, Al, Ag, etc. are suitable. Originally
The value of the diffusion coefficient of these metals with respect to the magnetic metal plate or the aluminum or aluminum alloy plate has not been sufficiently clarified in the literature or the like. However, it is clear that the melting points of all of these metals have intermediate melting points (including equivalents) between the magnetic metal plate and aluminum or aluminum alloy. (Here, “equal” means forming an aluminum or aluminum alloy layer on a magnetic metal plate and then joining them. 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 there is a nearly doubled difference.
Therefore, even if they are joined at a high temperature, stress is generated at the interface during cooling and they tend to peel off easily. Each of the metals in the above intermediate layer has a coefficient of thermal expansion that is intermediate (including equivalent) between the magnetic metal plate and aluminum or aluminum alloy. It is presumed that this has been alleviated and the bonding strength in the thermal uniaxial pressing method has been improved.

As a method for forming an intermediate metal layer in advance on the surface of the material plate, there are a wet method (plating, paste coating, etc.), a dry method (vacuum deposition, ion deposition, sputtering, etc.), as well as thermal spraying and melting. It is possible to immerse in metal. In the plating method, metals such as Cu, Ni, Ag, etc.
A coating having a thickness of m to several tens of μm can be formed.
Further, in a dry method such as vacuum vapor deposition or ion vapor deposition, a metal film of Al, Cu, Ni, Ag or the like (several μm, which has good purity and adhesiveness)
To a thickness of several tens of μm) can be formed without pollution. Further, a relatively thick film can be formed by depositing the molten metal on the surface, such as thermal spraying or immersion of the molten metal.

Even when the intermediate metal layer is formed by any of the above methods, the film forming surface of the material plate can be sufficiently cleaned in advance by means such as cleaning so as to prevent contamination of impurities. Effective for improving adhesion. In the case of plating treatment, it is desirable to include a step of removing oxides on the surface beforehand. Also in the case of vapor deposition, it is preferable to wash the surface in advance by means such as glow discharge.

Further, roughening the surface roughness of each of the magnetic metal plate and the aluminum or aluminum alloy plate or one of the material plates by means such as sand blasting improves the adhesion of the intermediate layer and the intermediate layer. Even in the case of direct bonding without forming a layer, it is effective in improving the bonding strength. This is due to the effect of cleaning the surface and the hot uniaxial pressing of the intermediate layer and / or the mating material (Axial Hot Press).
ing) is considered to be a biting effect.

As described above, in addition to the method of forming the coating of the intermediate layer on the surface of the material plate, a thin metal layer to be an intermediate layer is simultaneously rolled on a magnetic metal plate such as iron or stainless steel in advance. You may use the material plate clad by. For example,
A clad material such as Cu / stainless steel produced by the simultaneous rolling method is commercially available, and if a disc-shaped clad material is used as a material plate, plating and vapor deposition are not required.
It can be subjected to hot uniaxial pressing as it is.

Furthermore, hot uniaxial pressurization (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 an efficient mass production at low cost.

That is, when joining by the hot uniaxial pressing method, one magnetic metal plate and one aluminum or aluminum alloy plate are made into a unit set, and a plurality of this unit set is made of magnetic metal, aluminum or aluminum alloy. With a separating material having a melting point higher than any of the above, interposing a separator in a predetermined mold and performing hot uniaxial pressing. The high melting point means that the material has a small diffusion coefficient as described above. Even if the diffusion coefficient is small and hot uniaxial pressure is applied at the same time, it does not react with any of magnetic metal, aluminum or aluminum alloy, and works effectively as a separating material.

According to the above, a plurality of unit groups can be clad for each unit group and taken out due to the presence of the separating material.

As the separating material, for example, a sheet-shaped 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, a cloth-shaped material, or a powder-shaped material can be adopted. . Further, 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 the separating material.

When the thickness of the separating material is 3 mm or less, it is necessary that it is as thin as possible and highly durable. Thick separators are economically undesirable because they result in a reduction in the number of blank plates laminated in the mold during hot uniaxial pressing. Also, materials that are too thin or of low strength are disposable and economically undesirable.

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 set so as to wrap the intermediate metal layer inside. can do. in this case,
When hot uniaxial pressurization is performed at a relatively low temperature side (300 to 400 ° C.), a plurality of unit sets can be clad for each unit set and taken out without using a separating material.

Hot Uniaxial Pressurization (Axial Hot Pr
The pressing die of the essing) is designed so that the material plates and the separating material stacked inside the die do not collapse when pressed.
Act as a guide. On the other hand, the upper and lower punches transfer the high pressure of the hydraulic cylinder to the material plate, so a material that can withstand high temperature and high pressure is required. For example, iron-based heat-resistant alloy, ceramic, carbon or the like is suitable.

Hot Uniaxial Pressurization (Axial Hot Pr
For the bonding strength of the essing method, the optimum condition can be selected depending on the application and the required characteristics, but in general, when a deep drawing process is required in the post process with an electromagnetic heating cooker, a width of 5
It was confirmed that the peeling strength of the composite plate having a size of 3 mm is 3 Kg or more, which is the minimum strength at which problems such as peeling are unlikely to occur.

In the present invention, if a ferrite-based stainless steel plate is used for the magnetic metal plate, heat can be generated by an electromagnetic induction heating system, and it is used as an electromagnetic heating jar rice cooker pot or an electromagnetic cooking utensil device. You can

Further, in the present invention, if an Ag—Mn type aluminum alloy plate is used as the aluminum alloy plate, it is possible to obtain a container excellent in corrosion resistance.

[0066]

EXAMPLES The present invention will be described below with reference to examples. 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 that of magnetic metal, aluminum or aluminum alloy, 4 is uniaxial hot pressing (Axial) Hot
A die and a punch of a type for pressing are shown.

Example 1 The material of aluminum 2 is JIS3004 series aluminum alloy MG-110 (Sumitomo Light Metal) (Mg 0.6 to 0.8)
Mn 0.9-1.1% included), size 1.5 mm thick,
Using a circle plate of 425 mmΦ, the stainless steel 1 has a thickness of 0.5 mm and 425 mmΦ. The SUS430 circle board of was used. These were surface-cleaned with an alkali, and then 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, which is a unit of the composite plate material.

The set is placed in a die made of a carbon die, a punch is put in, and the whole die is hot uniaxially pressed (Axial).
It was set in a vacuum furnace of a Hot Pressing apparatus. While vacuuming the vacuum furnace to a vacuum degree of 5 × 10 ² ,
The temperature of the furnace is raised to 500 ° C., the pressure of 500 kg / cm ² is activated by operating the hydraulic device, and the pressure is maintained for 2 hours.
The temperature dropped. In this way, an aluminum / stainless steel laminated plate was obtained.

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

The aluminum surface of this was subjected to electrolytic etching in a Nacl aqueous solution with an electric quantity of 20 coulomb / cm ² to form fine irregularities on the surface, and a fluororesin dispersion liquid was applied to this surface and baked. This cover 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 the container of the present invention. There were no wrinkles, etc.

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

[0072]

[Table 1]

[0073]

[Table 2]

[0074]

[Table 3]

[0075]

[Table 4]

Although the invention of the present application has been described mainly with respect to the apparatus for electromagnetic heating type cookware, the invention of the present application is not limited to these and can be widely applied to the production of a molded composite material.

[0077]

As described above, according to the present invention,
There are no cracks, wrinkles, or peeling of composite plate materials that are press-formed, and the defect rate is extremely low. Further, when a plurality of sets of base materials are simultaneously hot uniaxially pressed by using a separating material, mass production can be performed and the cost can be reduced.

[Brief description of drawings]

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

[Fig. 2] Hot uniaxial pressurization (Axial Hot Pres
FIG. 3 is a schematic view of a (sing) method.

[Explanation of symbols]

 1 Magnetic metal such as iron and stainless steel 2 Aluminum or aluminum alloy plate 3 Separation material 4 type (mill) 5 type (pestle)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Miyamoto 950 Noda, Kumatori-cho, Sennan-gun, Osaka Prefecture Sumitomo Electric Industries, Ltd. Kumatori Factory

Claims (14)

[Claims] 1. A uniaxial hot pressing (A) between a magnetic metal plate such as iron and stainless steel and an aluminum or aluminum alloy plate.
A composite material which is joined by an xial hot pressing method. 2. A uniaxial hot press (A) between a magnetic metal plate such as iron and stainless steel and an aluminum or aluminum alloy plate.
A method for producing a composite material, which comprises joining by a xial hot pressing method. 3. A uniaxial hot press (A) between a magnetic metal plate such as iron and stainless steel and an aluminum or aluminum alloy plate.
A method for producing a composite material molded product, which comprises joining the composite plate materials by a press hot pressing method and / or punching and / or cutting the composite plate material. 4. A material plate made of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate,
Direct uniaxial hot pressing (Axi) without intermediate layer
The method for producing a composite material according to claim 2, wherein the joining is performed by an al Hot Pressing method. 5. A metal layer having a melting point intermediate or equal to the melting point of the material plate is formed on the surface of each of the magnetic metal plates such as iron and stainless steel and the aluminum or aluminum alloy plate and / or one of the material plates. After that, the method for producing a composite material according to claim 2, wherein the joining is performed by a hot uniaxial pressing (Axial Hot Pressing) method. 6. A metal layer having a coefficient of thermal expansion intermediate or equivalent to the coefficient of thermal expansion of the material plate on the surface of each / or one material plate of a magnetic metal plate such as iron or stainless steel and an aluminum or aluminum alloy plate. After forming, hot uniaxial pressing (Axial Hot Pressing)
The method for producing a composite material according to claim 2, characterized in that the two are joined 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 any one of Cu, Al, Ni and Ag or an alloy thereof. Manufacturing method. 8. The method of forming a metal layer on the surface of a material plate is any one of plating, vapor deposition, ion vapor deposition, and molten metal immersion, and the metal layer is a thin film or a thick film. A method for manufacturing the composite material according to claim 5 or 6. 9. The composite material according to claim 5 or 6, characterized in that a magnetic material plate made of iron, stainless steel or the like is used as a material plate in which a thin metal layer is clad by a simultaneous rolling method. Production method. 10. A magnetic metal plate such as iron or stainless steel and / or an aluminum or aluminum alloy plate and / or one of the material plates is roughened by a method such as sand blasting to make the surface roughness of the surface rough. A method for manufacturing the composite material according to claim 4, 5 or 6. 11. A uniaxial hot pressing between a magnetic metal plate and an aluminum or aluminum alloy plate (Axial Hot).
4. The surface of an aluminum or aluminum alloy plate is coated with a fluororesin before the composite plate material is press-molded and / or punched or cut after being joined by the Pressing method. Method for manufacturing composite molded article. 12. A magnetic metal plate and a single aluminum or aluminum alloy plate as a unit set, and a plurality of the unit sets are separated by a separating material having a melting point higher than that of magnetic metal, aluminum or aluminum alloy. And stack, and hot uniaxial pressing (Axial Hot Press)
ing) method for joining.
A method for manufacturing the described composite material. 13. A magnetic metal plate having a metal layer formed on one side and a single aluminum or aluminum alloy plate as a unit set, and a plurality of the unit sets are stacked without interposing a separating material, and heat is applied. Uniaxial pressure (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 for producing a composite material molded article according to claim 3, wherein the application of the composite material molded article is an electromagnetic heating cooker.