JPH1147882A - Device for forming mold and formation of die for stretch-forming flat plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold forming device which is suitable to forming a die for stretch-forming suitably to obtain an outer plate formed to two-dimensional or three-dimensional curving surface of aircraft, railway vehicle, etc., and a forming method of the die for stretch-forming. SOLUTION: A molten metal pouring part 25 is formed by fitting a molten metal receiving sheet 17 which is the heat resistant sheet so as to close the opening hole of a pit forming a molded layer 12 by filling the molding material of clay, sand, etc., and has the air-tightness and the flexibility and is difficult to develop the wrinkle, successively while pushing the molten metal receiving sheet 17 to the molded layer 12 with a forming device 19. Then, after setting a die base body fitting a positioning tool 28 and a hanging tool to the molten metal pouring part 25, a prescribed quantity of the molten metal is poured and solidified to obtain the die for stretch-forming. Further, instead of the molded layer 12 and the molten metal receiving sheet 17, a molten metal receiving bag fitting the molding material can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold forming apparatus and a method for forming a mold for stretch forming a flat plate.

[0002]

2. Description of the Related Art Conventionally, as is well known, an outer plate of an aircraft or a railway car is formed into a two-dimensional or three-dimensional curved surface. Such an outer plate is formed by stretching a flat plate, that is, as shown in FIG. 9, the chucks 1a,
A stretch molding die 3 formed into a predetermined curved surface is pressed against the flat plate 2 gripped by 1b.

[0003] The flat plate 2 is made of a stretch molding die 3.
Before is pressed, it is kept in a horizontal state and tensed. On the other hand, the stretch molding die 3
Is located below it, but has a plurality of cylinders 4
When the piston rod 5 is protruded and the table 6 mounted on the tip of the rod 5 is moved upward, the stretch molding die 3 set on the table 6 is also moved upward. You.

[0004] Therefore, by controlling the protrusion of the piston rod 5 of the cylinder 4 group in a predetermined manner, the stretch molding die 3 is pressed against the flat plate 2 in a predetermined manner to easily form a two-dimensional or three-dimensional curved surface. be able to. Therefore, in recent years, diversification of such stretch molding has been remarkable due to demands for larger and lighter aircraft, railway vehicles, and the like, and model changes.

[0005]

On the other hand, on the other hand, it is necessary to store a large number and a large variety of stretch molding dies 3, which is cumbersome to manage and causes a problem of storage space. In addition, the material cost of the stretch molding die 3 increases, and the transportation of the mold 3 is becoming a problem.

The present invention has been made in view of the above drawbacks, and as a result of intensive studies to solve the drawback, a pouring portion is formed while pressing a hot water receiving sheet against a molding material layer formed in a pit to which an exhaust device is mounted. Be able to do so, or
Stretch forming by filling the molding material and attaching an exhaust device to a hot water bag placed in the pit so that the pouring portion can be formed while pressing the hot water bag. It has been found that the present invention can cope with the diversification and the like of the present invention.

[0007]

That is, one of the mold forming apparatuses according to the present invention is mounted so as to close the upper end opening of the pit on which the molding material layer is formed, as described in claim 1. A hot water receiving sheet, an exhaust device for exhausting the hot water receiving sheet from the inside of the pit so as to bring the hot water receiving sheet into close contact with the modeling material layer, and pressing the hot water receiving sheet brought into close contact with the modeling material layer to form a pouring section. And a molding device for molding.

According to another aspect of the present invention, there is provided a mold forming apparatus comprising: a pit in which a hot water bag filled with a molding material is disposed; It is characterized by comprising an exhaust device for exhausting air and a forming device for pressing the evacuated hot water receiving bag body to form a pouring portion.

According to a third aspect of the present invention, there is provided a method for molding a stretch molding die using the mold manufacturing apparatus according to the first or second aspect. The molding method is characterized in that a mold base body to which a positioning tool and a suspending tool are mounted is interposed in a molten metal of a pouring section and is molded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, which is a longitudinal sectional view, a pit 10 is provided by dug down a floor 11 of a factory, and a predetermined amount of a forming material is filled therein to form a forming material layer 12. ing. The molding material is made of clay, sand, or the like, and a water supply pipe 13 for supplying water to the molding material layer 12 is opened on the side wall of the pit 10.

An exhaust device 16 having one end connected to a pump 14 and the other end of the exhaust pipe 15 opened to the side wall of the pit 10 is mounted, and the upper end opening of the pit 10 is closed on the floor 11. Hot water receiving sheet 1
7 is mounted, that is, mounted in a state where it is loosened to a predetermined degree via the sealing means 18. The exhaust pipe 1
6 is provided at a position close to the floor surface 11 and the water supply pipe 13 is provided at a position below the water supply pipe 13.

The hot water receiving sheet 17 has a thickness of 0.5
mm, a heat-resistant sheet such as a polyethylene sheet, a vinyl chloride sheet, a synthetic rubber sheet, or the like that can withstand the melting point of the low-melting alloy (less than 100 ° C.), and has airtightness and flexibility. However, the sheet is made of a sheet that is unlikely to have wrinkles. Also, the sealing means 18
Any type of means such as a means for pushing the hot water receiving sheet 17 into the groove provided on the floor surface 11 to seal the hot water receiving sheet 17 may be used, but simply, the weight is simply placed on the hot water receiving sheet 17. May be.

In addition, as shown in FIG. 2, a molding device 19 is mounted above the hot water receiving sheet 17, and the molding device 19 is mounted on the ceiling in the front-rear direction (Y direction).
A movable base 20 which is mounted so as to be able to move horizontally in the axial direction),
(Axial direction), a movable suspension arm 21 mounted so as to be able to move horizontally, a movable bracket 22 mounted so as to be able to move up and down on the movable suspension arm 21, and an articulated body mounted on the movable bracket 22 And a shaping tool 24 attached to the lower end of the articulated body 23.
The shaping tool 24 is mounted so as to be able to move in multiple directions based on signals from 6.

The control device 26 can send CAD data or a signal of the correction value to the molding device 19, and the operation is performed by an operator on the floor 11. Therefore, the shaping tool 24 can press the hot water receiving sheet 17 in a predetermined direction in a predetermined stroke to form a two-dimensional or three-dimensional curved surface pouring part 25, and at this time, the hot water receiving sheet 17 It is adhered to the layer 12.

That is, prior to forming the two-dimensional or three-dimensional curved surface pouring section 25, the molding material layer 1 is removed from the water supply pipe 13.
2 is supplied with a predetermined amount of water to wet the molding material, and is evacuated from the pit 10 by the exhaust device 16, so that the hot water receiving sheet 17 which has been relaxed in a predetermined manner is brought into close contact with the upper surface of the molding material layer 12. Can be In addition, the molding material is wetted so as to have shape retention.

Then, when the pouring section 25 having a two-dimensional or three-dimensional curved surface can be formed in this way, as shown in FIG. 3, the mold base body 27 is set there. The mold base body 27 includes a positioning tool 28 and a hanging tool 2.
9 and is carried by the overhead traveling crane using the suspending tool 29.

When the ladle 3 can be set at a predetermined position,
A predetermined amount of a molten metal 31 having a melting point of 0 to low (for example, a low-melting alloy having a melting point of less than 100 ° C.) is poured, that is, a positioning tool 28 and a hanging tool 29 mounted on the set mold base body 27. Is poured so as not to be immersed in the hot water (to expose it).

After a predetermined time has passed and the molten metal has solidified, the stretch molding die 3 is obtained. The stretch molding die 3 is suspended by the overhead crane using the suspending tool 29 and the pit 1 is suspended. To the stretch forming workshop and set on the table 6 as shown in FIG.

At this time, the positioning tool 2 is inserted into the recess of the table 6.
8 is inserted. Then, the piston 4 is moved upward by the protrusion control of the piston rod 5 of the cylinder 4 and pressed against the flat plate 2. Therefore, the flat plate 2 can be stretch-molded in a predetermined manner.

In the above-mentioned molding, the hot water receiving sheet 1
7 is pretensioned and the specific gravity of the molten alloy is 9 to 10, so that the load (pressure head) of the molten metal acts uniformly and no wrinkles are generated. As a result, smooth two-dimensional or tertiary The pouring section 25 having the original curved surface can be formed.

Further, by using an alloy melt having a temperature of at most 90 ° C. or less, the pouring temperature can be reduced to less than 100 ° C., so that the hot water receiving sheet 17 is not damaged in terms of heat resistance, and Receiving sheet 17 is formed material layer 1
2, the modeling material layer 12 serves as a backup (reinforcement) for the hot water receiving sheet 17 to prevent damage more effectively. Even if it is damaged, there is no safety problem because it is inside the pit 10.

As described above, the embodiment in which the molding material layer 12 formed in the pit 10 is wet to form the two-dimensional or three-dimensional curved pouring portion 25 has been described. Is also good. In that case, the molding material layer 12
Is made of sufficiently dried molding sand, silica sand, mountain sand, or metal particles having excellent heat conductivity (eg, iron, copper, aluminum particles) and as shown in FIG. Then, the exhaust pipe 15 of the exhaust device 16 may be extended to the bottom of the pit 10. The exhaust pipe 15 is provided with a large number of exhaust holes 32, and an appropriate filter such as a wire mesh for filtering the modeling material is mounted therein.

When the hot water receiving sheet 17 is made of a synthetic rubber sheet having a thickness of 3 to 5 mm, the exhaust pump 14 is a pump of a type that can be turned into a pressurizing pump by the reverse rotation operation. It is preferred to select By selecting such a type of exhaust pump, the supply of compressed air to the molding material layer 12 and the exhaustion thereof can be repeated, and when the stretch molding die 3 is taken out of the pit 10 after molding, a hot water receiving sheet is used. 17 can be facilitated, that is, mold release can be facilitated.

Also, a pouring section 25 formed in a predetermined manner.
Prior to pouring, the the upper surface of the hot water receiving sheet 17, by its composition to spray _{[MgO · SiO 2 · H 2} O] talc powder (talc), a smooth stretch molding casting surface The mold 3 can be obtained.

Next, unlike the above-described embodiment, a description will be given of an embodiment in which a hot water bag 35 filled with a molding material is provided in the pit 10 to obtain the stretch molding die 3. 8.

In these figures, the hot water receiving bag 35 is made of the same material as the hot water receiving sheet 17 described above, and includes a predetermined amount of the shaping material 12a, for example, dry sand, fine metal particles, or the like. While a predetermined amount of hydrated clay etc. is packed,
The bag opening is connected to the exhaust pipe 15 of the exhaust device 16 via a valve 36.

For this reason, the exhaust device 16 causes the hot water bag 35
While the air is being exhausted, the pouring section 25 having a two-dimensional or three-dimensional curved surface can be formed by the forming apparatus 19. In the case where the hot water bag 35 is made of fiber reinforced synthetic rubber and is filled with hydrated clay, the pouring section 25 can be formed with the valve 36 closed without operating the exhaust device 16. However, the material forming the hot water receiving bag 35 and the molding material 12
As for the combination with a, an appropriate combination can be selected as needed.

In addition, since the stretch molding die 3 is made of a low melting point alloy, if it becomes unnecessary, it can be melted and reused. At this time, the transporting device can be transported by hooking the hook of the transporting device to the suspending device 29, and therefore, the transporting device can be easily immersed in hot water in a hot tub (not shown).

For example, U manufactured by Osaka Asahi Metal Co., Ltd.
-Iron 70 (specific gravity 8.8, tensile strength 4.2 kg / mm
² , elongation 200%, hardness HB92, solidification expansion rate 4/10
00) at 77 ° C. ±
It can be dissolved in warm water 27 at 2 ° C. in about 25 minutes.

[0030]

As described above, according to the present invention, it is possible to mold a wide variety of molds as needed with one apparatus, and therefore, the number of molds to be stored can be reduced, and A mold forming apparatus capable of preventing complication of storage and the like can be obtained. In addition, since molding can be performed in a pit below the floor surface, work safety can be improved. Further, a stretch molding die that can be easily transported can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pit section on which a hot water receiving sheet is mounted.

FIG. 2 is a diagram illustrating a forming mode of a pouring section when a hot water receiving sheet is mounted.

FIG. 3 is a view showing a molding mode of a stretch molding die when a hot water receiving sheet is mounted.

FIG. 4 is a view showing a stretch forming mode of a flat plate.

FIG. 5 is a vertical view showing another example of the exhaust device.

FIG. 6 is a longitudinal sectional view of a pit portion in which a hot water bag is arranged.

FIG. 7 is a view showing a form of forming a pouring section when a hot water receiving bag is arranged.

FIG. 8 is a view showing a molding mode of a stretch molding die when a hot water bag is arranged.

FIG. 9 is a view showing a conventional flat plate stretch forming mode.

[Explanation of symbols]

 Reference Signs List 2 flat plate 3 stretch molding die 10 pit 11 floor surface 12 molding material layer 12a molding material 13 water supply pipe 16 exhaust device 17 hot water receiving sheet 18 sealing means 19 molding device 25 pouring section 27 mold base body 28 positioning tool 29 hanging Tool 35 Hot water bag

Claims (3)

[Claims] 1. A hot water receiving sheet mounted so as to close an upper end opening of a pit on which a modeling material layer is formed, and an exhaust device for exhausting the pit from the inside of the pit so as to bring the hot water receiving sheet into close contact with the modeling material layer. And a molding device for pressing the hot water receiving sheet brought into close contact with the modeling material layer to form a pouring portion. 2. A pit in which a hot water bag filled with a molding material is disposed, an exhaust device for exhausting the hot water from the hot water bag, and a pouring portion formed by pressing the exhausted hot water bag. A molding apparatus, comprising: a molding apparatus; 3. A method of molding a flat plate stretch molding die using the mold molding apparatus according to claim 1 or 2, wherein a mold base body provided with a positioning tool and a hanging tool is melted in a pouring section. A method for forming a mold for stretch molding a flat plate, wherein the molding is performed by interposing the mold inside.