JPH04258323A - Manufacture of metallic formed body and the same metallic formed body - Google Patents

Abstract

PURPOSE:To provide a method for forming a metallic formed body possible to have a satisfactory strength even in a part large in deformation. CONSTITUTION:A forming die composed of a receiving die 3 having a forming part 1 and a cover die 4 provided with a gas supply hole 6 facing the forming part 1 is used. A laminated body 15 of laminated metallic sheet of superplastic alloy covers a part on the formed part 1 where an amount of deformation is increased by deep drawing to close the cover die 4. Then, high temperature gas is supplied through a gas supply hole 6 and pressurized to deep-draw the laminated body 15 into the shape of the formed part 1 and to obtain a metallic formed body where a part large in amount of deformation is reinforced.

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 the hull of a small boat, and a metal molded body obtained by the molding method.

0002

[Prior Art] Conventionally, the hulls of small boats and the like have generally been molded from fiber-reinforced plastics (FRP), but FRP hulls are difficult to dispose of and are not recyclable. Technology is being considered to form ship hulls by deep drawing light metals such as aluminum.

For example, Japanese Patent Laid-Open No. 60-231530 proposes a method for forming a small boat body 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 the boat, and a hydraulic supply port facing the molding recess, and the receiving mold is configured to cover the opening of the molding recess. Using a mold consisting of a lid mold that is superimposed on the mold, a metal plate serving as a material is placed over the molding recess of the receiving mold, and the lid mold is overlaid watertightly from above, and hydraulic pressure is applied. Hydraulic pressure is supplied through the supply port, and this liquid pressure deep-draws the metal plate into the shape of the forming recess to form a molded body in the desired hull shape. According to the description in the above-mentioned publication, it is possible to efficiently form a small boat body of a predetermined shape using a metal plate using the above-mentioned forming method.

[0004] However, in the technique described in the above publication,
The amount of deformation is large in the parts formed at the bow and stern, and the thickness of the metal plate tends to be thinner in such parts than in other parts, so it may not be possible to obtain sufficient strength.

[0005]

[Problems to be Solved by the Invention] In order to solve such disadvantages, the present invention provides a method for forming a metal molded body that can obtain sufficient strength even in a portion with a large amount of deformation, and a method for forming a metal molded body that can obtain sufficient strength even in a portion with a large amount of deformation. The object of the present invention is to provide a metal molded body with improved properties.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the method for forming a metal molded article of the present invention includes a receiving mold having a forming section and a fluid supply port facing the forming section. A mold consisting of a lid mold that is overlapped with the receiving mold so as to cover the mold is used, and a laminate formed by laminating a plurality of metal plates is placed on at least a part of the molding part of the receiving mold, and the By supplying and pressurizing fluid through the fluid supply port while the lid mold is closed from above the laminate so that the outer periphery of the laminate is sandwiched between the receiving mold and the lid mold,
The method is characterized in that the laminate is deep drawn into the shape of the molded part.

[0007] As the laminate used in the molding method of the present invention, there can be mentioned a laminate in which a third metal plate is interposed at least in part between two metal plates.

In the forming method of the present invention, it is preferable that at least one of the metal plates constituting the laminate is made of a superplastic alloy. A 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 alloys, stainless steel alloys, titanium alloys, etc., and aluminum alloys are particularly preferred. As an aluminum-based superplastic alloy, for example, magnesium 4.7% by weight, chromium 0.1% by weight, manganese 0
．． Al-Mg-Cr-Mn containing 7% by weight, Al-Mg-Cr-Si containing 5.7% by weight magnesium, 0.2% by weight chromium, 2.6% by weight silicon, Al containing 17% by weight copper. -Cu, Al-Cu containing 33% by weight of copper, Al-Cu-Mg containing 33% by weight of copper, 7% by weight of magnesium,
Al-C containing 25% copper and 11% magnesium by weight
u-Mg, 25.2% copper, Al-Cu-Si containing 5.2% silicon, 6% copper, Supral 150 containing 0.5% zirconium, 6% magnesium.
, Al-Mg-Zr containing 0.4% by weight of zirconium,
Al-Si containing 11.7% by weight of silicon, 6% by weight of zinc,
BA708 with 3% magnesium, 5.6% zinc, 2.5% magnesium, 1.6% copper, 0.3% chromium, 10.7% zinc, 0.9% magnesium. Weight %, zirconium 0.4
Al-Zn-Mg-Zr including wt%, zinc 5-10wt%, zirconium 0.5wt%, tin 0.05wt%
Examples include Al-Zn-Zr-Sn.

[0010] Furthermore, the metal molded article of the present invention includes a laminate in which a plurality of metal plates are laminated at least in part, a receiving mold having a molding part, and a fluid supply port facing the molding part. and a lid mold overlaid on the receiving mold so as to cover the molding part,
and by supplying and pressurizing fluid through the fluid supply port with the lid closed so that the outer periphery of the laminate is sandwiched between the receiving mold and the lid mold from above the laminate. It is characterized by being deep drawn into the shape of the molded part.

[0011]

[Function] In the method for forming a metal molded body of the present invention, a laminate formed by laminating a plurality of metal plates in advance at least in part is used as a material, so that by appropriately arranging the laminated portion of the metal plates, A portion of the metal molded body formed from the metal plate having a large amount of deformation is constituted by the laminated portion, and a metal molded body in which this portion is reinforced is obtained.

[0012] In the forming method of the present invention, by using a laminate in which a third metal plate for reinforcement is interposed between the two metal plates, the reinforcing portion is hidden by the two metal plates. A metal molded body is obtained.

In the forming method of the present invention, by using at least one of the metal plates constituting the laminate as a metal plate made of a superplastic alloy, a large amount of deformation can be obtained even in the laminate portion.

According to the metal molded article of the present invention formed by the above method, at least the portion where the amount of deformation becomes large during molding is constituted by a laminate formed by laminating a plurality of metal plates. is reinforced to provide sufficient strength.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view showing a mold used in an example of the molding method of the present invention. The mold of this embodiment is used for molding the hull of a small boat, and as shown in FIG. It consists of a lid mold 4 which is superimposed 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 facing the molding section 1 and communicating with the conduit 5, and is movable up and down by a rod 7. A heater 8 is piped inside the inner box 2, receiving mold 3, and lid mold 4 that form the mold, so that the mold can be preheated during molding.

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

FIG. 2(a) is a longitudinal sectional view of the receiving mold 3. As shown in FIGS. 1 and 2(a), the molded portion 1 is formed as a recessed portion having the same external shape as the bottom of a small boat.

In order to mold the hull of a small boat using the mold, first, as shown in FIG.
0 is moved upward by the rods 7 and 11, and the laminate 15 is placed so as to close the molded part 1.

FIG. 2(b) is a plan view showing the laminate 15 used in this embodiment, and the positional relationship of each part of the laminate 15 is such that it corresponds to the receiving mold 3 shown in FIG. 2(a). It is shown. From the shape of the molded part 1 in FIG. 2(a), the laminate 1
It is expected that the amount of deformation will be larger in the parts corresponding to the bow part 1a and the stern part 1b of No. 5 than in other parts. Therefore, as shown in FIG. 2(b), the laminate 15 is placed in the areas where the bow and stern parts of the metal plate 15a are to be formed.
Metal plates 15b and 15c are laminated with their four corners fastened with screws 16.

In this embodiment, the metal plates 15a, 15b and 15c constituting the laminate 15 are all made of a superplastic alloy. In this embodiment, the metal plates 15a, 15b, and 15c are made of aluminum-based superplastic alloy Al-Mg-
A 2 mm thick piece of Cr-Mn was used. Metal plate 15a
, 15b and 15c can generally be appropriately set in the range of 0.5 to 5 mm, and a plate thickness that meets safety standards for small boats and the like can be easily obtained.

Among the metal plates, the metal plate 15a which becomes the base of the laminate 15 completely covers the molded part 1 and is sufficiently stretched outward from the periphery of the molded part 1 by at least an amount corresponding to the elongation during molding. It has a size that can be used. In this embodiment, when the laminate 15 is placed over the molded part 1, it is preferable that the surfaces of the metal plates 15b and 15c to which the metal plates 15b and 15c are screwed face the molded part 1. By covering the laminate 15 on the molded part 1 as described above, the metal plates 15b and 1
A metal plate 15a is formed to cover the metal plate 15c.
a and metal plates 15b and 15c are integrally formed.

Next, the outer cover 10 is attached to the outer box 9 using the rod 11.
The indoor atmosphere formed by the outer cover 10 and the outer box 9 is heated to 50 degrees by heating means (not shown).
Heat to 0°C. Thereby, the laminate 15 is exposed to the atmosphere and heated to the same extent as the atmosphere.

Next, the lid mold 4 is moved downward by the rod 7 and placed on the receiving mold 3 from above the laminate 15, and the lid is closed. At this time, the outer periphery of the laminate 15 is held between the receiving mold 3 and the lid mold 4. Next, air at room temperature is supplied from the gas supply port 6, and the laminate 15 is pressurized at a pressure of 7 kg/cm2 for 10 minutes to be deep drawn into the shape of the molded part 1. In this embodiment, the air for pressurizing 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 laminate 15 comes into contact with the receiving mold 3 during the deep drawing process, it will not be rapidly cooled.

By deep drawing the laminate 15 under the above conditions, the shape of the outer surface closely matches the molded part 1, and the R dimension of the edge part of the chine (the ridge facing the outside of the hull) is 3 m.
A small boat hull of m was obtained.

FIG. 3 is a longitudinal sectional view showing the hull of a small boat obtained by deep drawing the laminate 15. As shown in FIG. 3, the hull 17 is formed of a laminate 15,
The bow part 17a is a laminated part made of metal plates 15a and 15b, and the stern part 17b is made of a laminated part made of metal plates 15a and 15c.The bow part 17a and the stern part 17b are reinforced. It has become.

In this embodiment, a mold 3 having a concave molding part 1 having the same shape as the outer shape of the hull of a small boat is used. It may have a convex shape that is the same as .

FIG. 4(a) is a longitudinal cross-sectional view showing another embodiment of the receiving mold, and FIG. 4(b) is a laminate 15 obtained by deep drawing using the receiving mold of FIG. 4(a). FIG. 2 is a longitudinal sectional view showing the hull of a small boat. A receiving mold 43 shown in FIG. 4 has a molded portion 41 in which the concave molded portion 1 of the receiving mold 3 is formed into a convex shape, and is housed in an inner box 42 . The hull 44 obtained by using the receiving mold 43 is similar to the hull 17 in that it is formed of the laminate 15, but the metal plates 15b and 15c are located on the inner surface of the hull 44 at the bow 44a and stern 44b. It is different in that it is located in With this structure, the effect that the joint between the metal plates 15b and 15c does not appear on the outer surface of the hull 44 can be obtained.

The forming conditions for the deep drawing are as follows:
The temperature of the atmosphere is in the range of 300 to 600°C, and the pressurization is in the range of 1 to 10 kg/cm2, although it varies depending on the material and thickness of the metal plate constituting the metal plate.
Do this in a time range of minutes.

[0030] In the above forming method, the metal plate 1 of superplastic alloy is
Although the laminate 15 in which metal plates 15b and 15c made of the same alloy are screwed to the portion where the amount of deformation of 5a becomes large is used, the structure of the laminate used as the material is not limited to this. Other embodiments are also possible.

FIG. 5(a) is a longitudinal cross-sectional view showing another embodiment of the laminate 51, and FIG. 5(b) shows the hull of a small boat obtained by deep drawing the laminate 51 using the receiving mold 3. FIG. The receiving mold 3 shown in FIG. 5(b) is the same as the receiving mold 3 shown in FIG. 2, and the positional relationship of each part of the laminate 51 is as shown in FIG.
It is shown to correspond to the receiving mold 3 shown in (b). As shown in FIG. 5(a), the laminate 51 is formed in the areas where the bow and stern parts of the metal plates 51a and 51b are to be formed.
Furthermore, the metal plates 51c and 51d are the metal plates 51a and 51d.
1b and stacked. By making the laminate 51 have the above structure, an effect is obtained in that the joint between the metal plates 15c and 15d does not appear on both the inner and outer surfaces of the hull 52 shown in FIG. 5(b). A metal plate 51a constituting the laminate 51,
51b, 51c, and 51d are all 1.2 mm thick metal plates made of the aluminum-based superplastic alloy Al-Mg-Cr-Mn.

[0032] To mold the laminate 51 using the mold, the laminate 51 is heated by exposing it to an atmosphere of 500°C.
Air at room temperature is supplied from the gas supply port 6, and the laminate 51 is pressurized at a pressure of 10 kg/cm2 for 15 minutes.
Deep draw into the shape. The forming conditions for the deep drawing differ depending on the material and thickness of the metal plates constituting the laminate 51, but the temperature of the atmosphere is in the range of 300 to 600°C, and the pressure is in the range of 5 to 10 kg/cm2. It is carried out for a time ranging from 20 to 40 minutes at a pressure in the range.

[0033] In the forming method described above, the laminate is formed in one step, but it may be formed in two steps.
- When performing two-step molding on a laminate in which two layers of 0.6 mm thick metal plates of Mn are laminated, the laminate is
The laminate is heated by exposing it to an atmosphere of 0° C., and air at room temperature is supplied from the gas supply port 6, and the laminate is first pressurized at a pressure of 2 atm for 5 minutes, and then pressurized at a pressure of 4.5 atm for 30 minutes. Do it like this.

[0034] In all of the above-mentioned molding methods, room temperature air is used as the gas to pressurize the laminate, but the gas may also be an inert gas such as nitrogen, and even if these gases are heated, good. Further, instead of pressurizing with gas, pressure may be applied with liquid, and in this case, the atmosphere inside the room formed by the outer lid 10 and the outer box 9 may be heated.

In this embodiment, the hull of a small boat is used as an example, but the metal molded body of the present invention is not limited to this, and may be used for other purposes.

[0036]

Effects of the Invention As is clear from the above, according to the forming method of the present invention, a laminate formed by laminating a plurality of metal plates in advance in a portion is used as a material, and the laminated portion of the metal plates is By appropriately arranging them, it is possible to obtain a metal molded body in which a portion with a large amount of deformation is constituted by the laminated portion.

In the forming method of the present invention, by using a laminate in which a reinforcing metal plate is sandwiched between two metal plates, it is possible to form a metal molded body in which the reinforcing metal plate does not appear on the outer surface. Can be molded.

Furthermore, in the forming method of the present invention, by using a laminate in which at least one metal plate is made of a superplastic alloy, it is possible to obtain a large amount of deformation even in the laminate portion.

[0039] According to the metal molded article of the present invention formed by the above-described method, the portion with a large amount of deformation is composed of a portion where a plurality of metal plates are laminated, so that sufficient strength can be ensured in this portion. Can be done.

[Brief explanation of the drawing]

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

FIG. 2 is an explanatory diagram showing the structure of an example of a laminate as a material.

FIG. 3 is a sectional view showing the structure of an example of the metal molded article of the present invention.

FIG. 4 is an explanatory diagram showing the structure of another example of the metal molded body of the present invention.

FIG. 5 is a sectional view showing another embodiment.

[Explanation of symbols]

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

Claims (4)

[Claims] 1. A mold comprising a receiving mold having a molding part, and a lid mold having a fluid supply port facing the molding part and superimposed on the receiving mold so as to cover the molding part. A laminate formed by laminating a plurality of metal plates is placed over at least a portion of the molding part of the mold, and the outer periphery of the laminate is held between the receiving mold and the lid mold from above the laminate. A method for forming a metal molded body, characterized in that the laminated body is deep drawn into the shape of the molded part by supplying and pressurizing fluid through the fluid supply port with the lid closed. 2. The method of forming a metal molded body according to claim 1, wherein the laminate is formed by interposing a third metal plate at least partially between two metal plates. 3. The method for forming a metal molded body according to claim 1, wherein at least one of the metal plates constituting the laminate is made of a superplastic alloy. 4. A laminate in which a plurality of metal plates are laminated on at least a portion thereof, the receiving mold having a molding portion, and a fluid supply port facing the molding portion, the receiving mold being configured to cover the molding portion. The mold is placed over the molding part of the receiver mold of a mold consisting of a lid mold superimposed on the mold, and the outer periphery of the laminate is held between the receiver mold and the lid mold from above the laminate. A metal molded article characterized in that it is deep drawn into the shape of the molded part by supplying and pressurizing fluid through the fluid supply port with the lid closed.