JPH0515931A - Molding method for metallic molding and metallic molding - Google Patents

Abstract

PURPOSE:To provide the improved molding method for the metallic moldings consisting of at least two metallic sheets. CONSTITUTION:Forming molds consisting of a receiving mold 3 having a forming part 1 and a cap mold 4 having a gas supply port 6 facing the forming part 1 are used. A laminate 12 is put on the forming part 1 and the cap mold 4 is closed. High-temp. air is then supplied from the gas supply port 6 to deep draw the laminate 12 to the shape of the forming part 1. The laminate 12 is constituted by crimping asbestos between the two metallic sheets consisting of a superplastic alloy and tack welding the metallic sheets in the peripheral part thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a metal molded body used for a hull of a small boat and the like, and a metal molded body obtained by the method.

[0002]

2. Description of the Related Art Conventionally, hulls such as small boats are generally formed of fiber reinforced plastics (FRP), but it is difficult to dispose of FRP hulls and they are not reusable. Because of problems, a technique for forming a hull by deep drawing light metals such as aluminum has been studied.

For example, Japanese Unexamined Patent Publication No. 60-231530 proposes a method for forming a small hull by deep drawing aluminum. The technology described in the above publication includes a receiving mold having a molding recess having the same shape as the outer shape of a boat, and a liquid supply port facing the molding recess, and the receiving mold is configured to cover the opening of the molding recess. A liquid supply port is used in a state in which a molding die including a lid die to be overlapped is used, a metal plate as a material is covered on the molding recess of the receiving die, and the lid die is superposed in a watertight manner from above. A liquid is supplied and pressurized through the metal plate, and the liquid pressure deep-draws the metal plate into the shape of the recess for forming into a desired hull-shaped molded body. According to the description of the publication, a small hull of a predetermined shape can be efficiently formed by using the metal plate as a material by the forming method.

However, since the hull obtained by the technique described in the above publication is formed of a single metal plate, it may not be possible to obtain a preferable buoyancy as the hull. In order to give a molded product obtained by processing a metal plate properties such as sufficient buoyancy as a hull that are different from the properties peculiar to the metal plate, the molded product has a double structure consisting of two metal plates inside and outside. It is conceivable that they are formed and another member is interposed between the two metal plates.

However, in order to form such a formed body, the inner metal plate and the outer metal plate are separated from each other so that a gap in which another member can intervene is provided between the two metal plates. Since it is necessary to mold from a mold, there is a disadvantage that the number of steps increases.

[0006]

In order to solve such inconveniences, the present invention is provided with an improved forming method of a metal formed body composed of at least two metal plates and a characteristic different from the characteristic peculiar to the metal sheets. It is an object of the present invention to provide a metal formed body.

[0007]

In order to achieve the above object, a method of molding a plate according to the present invention is provided with a receiving mold having a molding portion and a fluid supply port facing the molding portion, and covering the molding portion. As described above, a molding die including a lid die that is superposed on the receiving die is used, and at least two metal plates whose peripheral portions are joined to each other are formed on the molding portion of the receiving die, and a separate member is provided between the metal plates. A fluid is supplied through the fluid supply port while covering the laminated body that is being held and closing the lid mold so that the outer periphery of the laminated body is sandwiched between the receiving mold and the lid mold from above the laminated body. Then, the laminated body is integrally deep-drawn into the shape of the forming portion by pressurizing.

The separate member preferably has flexibility because the laminate is subjected to deep drawing, and is preferably heat resistant because the deep drawing involves heating. Examples of such a separate member include asbestos and metal fibers.

In the method for forming a metal formed body according to the present invention, the laminated body is integrally deep-drawn into the shape of the forming portion, and then the joining state between the metal plates constituting the laminated body is temporarily released. After removing the separate member, the metal plate forming the laminate may be rejoined at its peripheral portion, and after removing the separate member, the metal plate forming the laminate may be formed between the metal plates. The metal plates forming the laminate may be rejoined at their peripheral portions with a material having a small specific gravity interposed.
Examples of the material having a smaller specific gravity than the metal plate include various foams such as styrofoam and sponge.

The forming method of the present invention can be applied particularly advantageously when the metal plate is made of a superplastic alloy.
The superplastic alloy is a material that can obtain plastic deformation of at least 150% or more and bending deformation of about 5 mmR.

Examples of such alloys include aluminum-based alloys, stainless-based alloys, titanium-based alloys, and the like, with aluminum-based alloys being particularly preferred. As the aluminum-based superplastic alloy, for example, Al-Mg-Cr-Mn containing 4.7% by weight of magnesium, 0.1% by weight of chromium, and 0.7% by weight of manganese, 5.7% by weight of magnesium, and 0.2 of chromium. %, Al-Mg-Cr-Si containing 2.6% by weight of silicon, Al-Cu containing 17% by weight of copper, Al-Cu containing 33% by weight of copper, copper 33
% -Al-Cu-M containing 7% by weight of magnesium
Al containing g, 25% by weight of copper, and 11% by weight of magnesium
-Cu-Mg, 25.2% by weight of copper, Al-Cu-Si containing 5.2% by weight of silicon, 6% by weight of copper, 0.
Supra 150 containing 5 wt%, 6 wt% magnesium, Al-Mg-Z containing 0.4 wt% zirconium
r, Al-Si containing 11.7 wt% silicon, 6 wt% zinc, BA708 containing 3 wt% magnesium, zinc 5.
AA7075 containing 6% by weight, 2.5% by weight of magnesium, 1.6% by weight of copper, 0.3% by weight of chromium, 1 zinc
Al-Zn-Mg-Zr containing 0.7% by weight, 0.9% by weight of magnesium and 0.4% by weight of zirconium, zinc 5
-10 wt%, zirconium 0.5 wt%, tin 0.0
Examples thereof include Al-Zn-Zr-Sn containing 5% by weight.

Further, the metal molded body of the present invention comprises a mold having at least two metal plates whose peripheral portions are joined together, in which a separate member is held between the metal plates, and a mold having a molding portion, A molding die having a fluid supply port facing the molding portion, the lid mold being overlaid on the molding die so as to cover the molding portion, and covered on the molding portion of the receiving mold, and the lid mold The shape of the molding part is integrally formed by supplying and pressurizing a fluid through the fluid supply port in a state where the outer periphery of the laminate is closed so as to be sandwiched by a receiving mold and a lid mold from above the laminate. It is characterized in that it is formed by deep drawing.

[0013]

According to the method for forming a metal formed body of the present invention, a laminated body in which at least two metal plates are joined at their peripheral portions and a flexible and heat-resistant separate member is held between the metal plates is provided. By performing deep drawing as a material, a molded body in which the separate member is sandwiched between the metal plates can be obtained. In such a formed body, since the metal plates are formed into substantially similar shapes according to the thickness of the separate member sandwiched between the metal plates, a gap corresponding to the thickness of the separate member is formed between the metal plates. To be done. The molded body is provided with a characteristic derived from another member held in the gap between the metal plates.

Further, in the forming method of the present invention, the joining state between the metal plates forming the metal formed body is once released to remove the holding member, and then the space formed between the metal plates is hollowed. Or by filling various materials and re-bonding the respective metal plates at their peripheral portions, other properties different from the properties derived from another member used for the material laminate are formed. Granted to.

At this time, the respective metal plates are left hollow, or a material having a smaller specific gravity than the metal plates is interposed between the metal plates, and the metal plates are rejoined at their peripheral portions. The buoyancy suitable for use as a hull is imparted to the metal molded body.

In the forming method of the present invention, a metal plate made of a superplastic alloy is used, so that a large amount of deformation can be obtained even when a laminated body made of a plurality of metal plates is used as a raw material.

Further, according to the metal molded body of the present invention, since a gap in which another member can be interposed is formed between the metal plates, various materials can be interposed in the gap to form a single molded body. Properties different from those of the case where the metal plate is used.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory cross-sectional view for explaining an example of the molding method of the present invention. The present embodiment is a method for forming the hull of a small boat, and the forming mold is as shown in FIG.
As shown in FIG. 3, the mold 3 includes a receiving mold 3 which is housed in the inner box 2, and a lid mold 4 which is superposed on the receiving mold 3 so as to cover the molding part 1. The lid mold 4 is provided with a gas supply port 6 which faces the molding portion 1 and communicates with the pipe line 5, and is vertically movable by a rod 7. A heater 8 is piped inside the inner box 2, the receiving mold 3 and the lid mold 4 forming the molding die so that the molding die can be preheated at the time of molding.

The mold is further housed in a chamber formed by an outer box 9 and an outer lid 10, and the outer lid 10 can be moved up and down by a rod 11. Further, the gas supply line 5 is provided so as to penetrate the lid mold 4 and the outer lid 10, and the rod 6 is provided so as to penetrate the outer lid 10.

FIG. 2A is a vertical sectional view of the receiving mold 3. As shown in FIGS. 1 and 2A, the molding portion 1 is formed as a recess having the same shape as the outer shape of the bottom portion of the small boat.

In order to mold a hull of a small boat using the molding die, as shown in FIG. 1, first, a lid mold 4 and an outer lid 1 are formed.
0 is moved upward by the rods 7 and 11, and the laminated body 12 is covered so as to close the molding unit 1.

FIG. 2B is a sectional view showing the laminated body 12 used in this embodiment in association with the molding portion 1 shown in FIG. 2A. As shown in FIG. 2 (b), in the laminated body 12, asbestos 13 is sandwiched and laminated between the metal plates 12 a and 12 b, and the outer peripheral portions of the metal plates 12 a and 12 b are temporarily welded. .

In this embodiment, as the metal plates 12a and 12b constituting the laminate 12, aluminum superplastic alloys Al-Mg-Cr-Mn having a thickness of 2 mm are used. The thickness of the metal plates 12a and 12b is generally 0.5.
It can be appropriately set within a range of up to 5 mm.

The laminate 12 has such a size that it completely covers the molding portion 1 and at least corresponds to the extension margin at the time of molding so as to project outward from the peripheral edge of the molding portion 1.

Next, the outer lid 10 is attached to the outer box 9 by the rod 11.
And the lid is closed and the atmosphere in the room formed by the outer lid 10 and the outer box 9 is set to 50 by a heating means (not shown).
Heat to 0 ° C. Thereby, the laminated body 12 is exposed to the atmosphere and heated to the same degree as the atmosphere.

Next, the lid mold 4 is moved downward by the rod 7 so as to be superposed on the receiving mold 3 from above the laminated body 12 and the lid is closed. At this time, the outer peripheral portion of the laminated body 12 is sandwiched between the receiving mold 3 and the lid mold 4. Next, normal temperature air is supplied from the gas supply port 6, and the laminated body 12 is pressed at a pressure of 7 kg / cm ² for 10 minutes to perform deep drawing in the shape of the molding unit 1. In this embodiment, the air that pressurizes the laminate is used at room temperature, but the air may be heated. In this embodiment, since the receiving mold 3 is heated to about 350 ° C.,
Even if the heated laminated body 12 comes into contact with the receiving mold 3 by the deep drawing, it is not rapidly cooled.

At this time, the metal plate 1 constituting the laminated body 12
Since 2a and 12b are tentatively welded on the outer periphery,
The asbestos 13 is held between the metal plates 12a and 12b, and the metal plates 12a, 12b and the asbestos 13 are integrally deep-drawn without being extruded from between the metal plates by the pressure.

FIG. 3 (a) is a sectional view of a molded body 31 obtained by deep drawing of the laminate 12. Molded body 3
As shown in FIG. 3 (a), the shape of the outer surface 1 is the molding part 1.
Is a metal molded body composed of an outer metal plate 32a that closely matches the metal plate 32a and an inner metal plate 32b that has a shape substantially similar to the metal plate 32a. Asbestos 13 is provided between the metal plate 32a and the metal plate 32b. Is held.

As described above, the molded body 31 has the asbestos 1 inside.
3 is held, the aluminum-based superplastic alloy Al-Mg-Cr- forming the metal plates 32a and 32b.
The heat insulating property is improved as compared with Mn. However, when the molded body 31 is used as a hull, it is desired to further increase the buoyancy.

Then, next, the temporary welding of the metal plates 32a and 32b constituting the molded body 31 is released, and the metal plate 32 is released.
After removing asbestos 13 from between a and 32b, asbestos 1
3 instead of 3, styrofoam 33 is sandwiched and metal plate 32
Re-weld a and 32b in the outer peripheral part. As a result, as shown in FIG. 3B, the styrofoam 33 is interposed between the metal plates 32a and 32b, and the hull 34 having increased buoyancy.
was gotten. The styrofoam is molded to a thickness corresponding to the gap between the metal plates 32a and 32b formed of asbestos 13.

In the above process, the metal plates 32a and 32
b may be re-welded without the Styrofoam 33 interposed therebetween to obtain a hull in which the gap between the metal plates 32a and 32b is hollow. Even with such a hull,
The buoyancy is increased as compared with the aluminum-based superplastic alloy Al-Mg-Cr-Mn which is the raw material of the metal plates 32a and 32b.

In this embodiment, the mold 3 having the concave shaped molding 1 having the same shape as the outer shape of the hull of the small boat is used, but a mold of another form may be used. Good. FIG. 4 shows a vertical sectional view of another embodiment of the receiving mold. In the receiving mold 43 shown in FIG. 4, a molding part 41 having a convex shape having the same shape as the inner shape of the hull of a small boat is housed in an inner box 42. Even if the receiving mold 43 is used, the laminated hull can be formed in the same manner as described above.

The forming conditions of the deep drawing are the laminated body 12
The temperature of the atmosphere is in the range of 300 to 600 ° C., and the pressure is in the range of 1 to 10 kg / cm ² for 10 to 20 minutes, although it depends on the material and plate thickness of the metal plate constituting Do in time.

In the molding method described above, the molding of the laminate is performed in one step, but it may be performed in two steps. In the case of performing two-step molding, for example, the laminated body is exposed to an atmosphere of 500 ° C. to be heated, air at room temperature is supplied from the gas supply port 6, and the laminated body is first kept at a pressure of 2 atm for 5 minutes. Pressurize, then 60 at 4.5 atm pressure
It is performed by applying pressure for a minute.

In the above-mentioned molding method, air at room temperature is used as the gas for pressurizing the laminate, but the gas may be an inert gas such as nitrogen, and these gases may be heated. Further, instead of pressurizing with gas, liquid may be applied, and in this case as well, the atmosphere in the room formed by the outer lid 10 and the outer box 9 may be heated.

In the above-mentioned embodiment, since the metal molded body is used as the hull of a small boat, a material for increasing its buoyancy is interposed in the gap between the metal plates. It is also possible to provide the metal molded body with desired properties such as heat insulating property by interposing another material in the gap between the metal plates.

[0037]

As is apparent from the above, according to the forming method of the present invention, at least two metal plates are joined at their peripheral portions, and another member is held between the metal plates. A laminate formed body comprising at least two metal plates by performing deep drawing using the laminate as a material, wherein a metal material interposing between the metal sheets a material imparting characteristics different from those of the metal sheets is interposed. Can be molded in a single operation.

The metal molding itself has different characteristics from those of the metal plate due to another member used in the laminate as the raw material, but in the molding method of the present invention, the metal molding is After temporarily removing the joining state between the metal plates forming the body and removing the holding member, the spaces formed between the metal plates remain hollow or filled with various materials to By re-bonding the metal plates at their peripheral portions, it is possible to impart other properties to the metal molded body.

At this time, the metal plates are left hollow or a material having a smaller specific gravity than the metal plates is interposed between the metal plates, and the metal plates are rejoined at their peripheral portions. The buoyancy can be increased so that the metal molded body is suitable for use as a hull.

In the forming method of the present invention, by using metal plates made of a superplastic alloy as a plurality of metal plates forming a laminate as a raw material, it is possible to increase the size even when different members are held between the metal plates. The amount of deformation can be secured.

Further, in the metal molded body of the present invention, since a gap in which another member can intervene is formed between the metal plates,
By interposing various materials in the gap, or
By making the gap hollow, it is possible to impart desired characteristics different from those of the formed body formed of a single metal plate to the formed metal body.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing an example of a molding method of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a configuration example of a laminated body which is a material.

FIG. 3 is a cross-sectional view showing a structural example of a metal molded body of the present invention.

FIG. 4 is a vertical cross-sectional view showing another example of the receiving mold used in the present invention.

[Explanation of symbols]

1 ... Molding part, 3 ... Receiving mold, 4 ... Lid mold, 6 ... Gas supply port, 1
2 ... Laminated body

Claims (5)

[Claims] 1. A molding die comprising a molding die having a molding portion, and a lid mold having a fluid supply port facing the molding portion and overlapping the molding die so as to cover the molding portion. A molding body of the mold is covered with a laminated body which is composed of at least two metal plates whose peripheral portions are joined and in which a separate member is held between the metal plates, and the lid mold is laminated on the laminated body. With the outer periphery of the body closed so as to be sandwiched between the receiving mold and the lid mold, a fluid is supplied through the fluid supply port to pressurize the laminated body to form a deep drawing into the shape of the forming portion. A method for forming a metal formed body, comprising: 2. A laminated body in which peripheral portions are temporarily joined together, the laminated body being deep-drawn integrally into the shape of the forming portion, and then the metal forming the laminated body once. 2. The method for forming a metal formed body according to claim 1, wherein after the joined state between the plates is released and the separate member is removed, the metal plates forming the laminated body are re-joined at their peripheral portions. 3. After removing the separate member, a material having a smaller specific gravity than the metal plate is interposed between the metal plates forming the laminated body, and the metal plates forming the laminated body are rejoined at their peripheral portions. The method for forming a metal formed body according to claim 2, wherein 4. The method for forming a metal formed body according to claim 1, wherein the metal plate is made of a superplastic alloy. 5. A laminate having at least two metal plates having peripheral portions joined to each other and a separate member being held between the metal plates, and a mold having a molding portion, and a fluid supply port facing the molding portion. A molding die including a lid die that is superposed on the die so as to cover the molding portion, and is covered on the molding portion of the die, and the lid die is laminated from above the laminate. In the state where the outer periphery of is closed so as to be sandwiched between the receiving mold and the lid mold, a fluid is supplied through the fluid supply port to pressurize it to integrally form a deep drawing into the shape of the molding portion. A metal formed body.