JP2001219281A - Method ad apparatus for manufacturing vacuum forming body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which a vacuum forming body used for a heat insulation material, etc., is joined at a periphery of materials to be joined by leaving a discharge port by inert gas arc welding, etc., is produced by sealing the discharge port while evacuating the gas in a formed gas tight part, a heat strain is likely generated, a large scale support apparatus is required to eliminate heat strain effect in the case of manufacturing a vacuum forming body of various shapes by assembling materials to be joined of a plate shape, etc., an equipment cost is increased, a clearance is generated to an overlapped part, gas is likely left therein, thus, high vacuum is hardly obtained. SOLUTION: In a manufacturing method comprising joining process, in which materials 11, 12 to be joined of a prescribed shape are assembled/joined to form an air tightness part 3, and a sealing process by joining/sealing a sealing part 21 while evacuating the air tightness part 3, a friction agitation joining process is used for the joining process and the sealing process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a vacuum formed body having a vacuum formed by combining and joining materials having a predetermined shape, and more particularly to a heat insulating bottom plate of a refrigerator and a heat insulating wall of a heat insulating box. The present invention relates to a technique for manufacturing a vacuum formed body having various sizes and shapes such as a flat shape and an elliptical shape.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a vacuum formed body used for a heat insulating member or the like, first, in a joining step, an exhaust port (hereinafter referred to as "sealing") for closing a peripheral edge of a material to be joined having a predetermined shape later. ), All are joined by inert gas arc welding or the like to form an airtight portion inside, and in the next sealing step, the sealed portion is joined and hermetically sealed while the airtight portion is evacuated. In the sealing step, an air-sealing method of sealing the sealing portion by pressure bonding or the like while evacuating the air-tight portion with a pump or the like in the air, and a vacuum forming body provided with the air-tight portion are provided. There is a vacuum sealing method in which a vacuum chamber is placed in a vacuum chamber, the vacuum chamber is evacuated, and the airtight section is evacuated, and then the sealing section is sealed in the vacuum chamber by brazing or the like.

[0003]

However, there are the following problems in any of the conventional joining steps and sealing steps as described above. In other words, since inert gas arc welding is used when joining the edges of the materials to be joined, the heat input is large and thermal strain is likely to occur, so the conventional vacuum formed body has a cylindrical shape that is difficult to deform from the viewpoint of airtightness. In order to manufacture vacuum-formed bodies of various shapes by combining plate-like materials to be joined, it is necessary to suppress this thermal strain and make the materials to be joined closely together. There is a problem that it is necessary and the equipment cost is high.

[0004] Even if the materials to be joined can be strongly adhered to each other, as shown in FIG.
1b can be joined only by welding from the outside along the end face of the overlapped portion 4. Since a gap 5 is formed in the overlapped portion 4 and gas remains there, a high vacuum in the vacuum forming body 7 is obtained. However, there is a problem that the bonding strength and airtightness of the bonding portion 2 cannot be sufficiently secured because the bonding width 6 of the bonding portion 2 is small. Furthermore, since inert gas arc welding uses an auxiliary welding material, there is a problem in that the penetration depth of the base material, which greatly affects the airtightness of the joint, cannot be sufficiently obtained, and airtight leakage is likely to occur.

[0005] Further, the sealing portion in the above-mentioned sealing method in the atmosphere is:
Generally, it is constituted by a pipe made of pure copper having one end inserted into an airtight part and the other end protruding outside, and the pipe is vacuum-sealed by applying pressure and pressure while evacuating. However, since the pipe is protruded from the vacuum forming body, it is easily broken, and when the hermetic part is thin, it is difficult to attach such a pipe itself, and further, the hermetic leakage from the pipe occurred. In such a case, there is a problem that it is necessary to replace the pipe and it takes time to reseal.

[0006] In addition, brazing is generally performed on the sealing portion by the above-mentioned vacuum sealing method. Of which
In the case of a soft solder, since a flux is used, a gas is generated at the time of heating, so that it is difficult to obtain a high vacuum, and in the case of a hard solder, there is a problem that heat distortion is liable to occur due to the need to heat to a high temperature.

[0007]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. That is, in claim 1,
A method for manufacturing a vacuum formed body, comprising: a joining step of combining and joining materials to be joined in a predetermined shape to form an airtight portion therein; and a sealing step of joining and sealing a sealing portion while vacuuming the airtight portion. A friction stir welding method is used in the joining step and the sealing step.

According to a second aspect of the present invention, when the friction stir welding method is used in the joining step according to the first aspect, the starting end and the end of the joining line are provided at positions separated from the joining line forming the hermetic portion. is there.

According to a third aspect of the present invention, when the friction stir welding method is used in the joining step of the first aspect, the sealing portion is provided in the material to be joined.

According to a fourth aspect of the present invention, the sealing portion according to the third aspect is configured such that sealing can be performed a plurality of times by friction stir welding.

According to a fifth aspect of the present invention, in the sealing step of the first aspect, after the airtight portion is evacuated by a pump,
A connecting pipe for connecting and connecting the pump and the airtight portion,
It is sealed by a friction stir welding method.

In a sixth aspect of the present invention, in the sealing step of the first aspect, after the vacuum forming body provided with the hermetic portion is placed in a vacuum chamber, the hermetic portion is evacuated to seal the hermetically sealed portion.
A tool is inserted from the outside of the vacuum chamber to the inside so as to be able to maintain airtightness, and the tool is used to seal the sealing portion by a friction stir welding method.

According to a seventh aspect of the present invention, there is provided a method for manufacturing a vacuum-formed body in which a material to be joined having a predetermined shape is combined and joined to form an airtight portion inside, and then the sealing portion is joined and hermetically sealed while the airtight portion is evacuated. In the apparatus, a vacuum chamber capable of disposing a vacuum forming body therein, a friction stir welding apparatus having a tool inserted in an airtight manner from the outside to the inside of the vacuum chamber, and a vacuum forming body in the vacuum chamber are fixed. And a feeding device that can move at a high speed.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a vacuum forming body according to the present invention in which the peripheral edges are joined by a friction stir welding method, FIG. 2 is a cross-sectional view of the same, and FIG. FIG. 4 is a plan view of the vacuum forming body showing a joining line, FIG. 5 is a plan view of the vacuum forming body showing a joining line of an airtight portion, and FIG. 6 is a joining line for sealing. FIG. 7 is a plan view of a vacuum forming body shown in FIG. 7, FIG. 7 is a perspective view of a sealing portion performing sealing in the atmosphere by friction stir welding, and FIG. 8 is a side view of a vacuum sealing device performing sealing in vacuum by friction stir welding. FIG. 9 is a perspective view of a vacuum forming body in which the upper and lower surfaces of an overlapped portion are sandwiched by dummy members, FIG. 10 is a perspective view of a vacuum forming body having no projecting portion on a workpiece, and FIG. 11 is a conventional inert gas arc. It is sectional drawing of the vacuum formed body by a welding method.

First, the overall structure of the method for manufacturing a vacuum formed body according to the present invention will be described with reference to FIGS. The method for manufacturing a vacuum-formed body according to the present invention includes a joining step of combining and joining materials to be joined in a predetermined shape to form an airtight portion inside, and a sealing step of joining and hermetically sealing a sealing portion while evacuating the airtight portion. And a stopping step.

In the joining step, as shown in FIG. 1, the workpiece 11 provided with the protruding portion 11a by press working or the like is placed on the flat plate-shaped material 12 to be protruded.
Are placed on top of each other, a backing 8 is brought into contact with the back surface of the overlapping portion 4, and a high-speed rotating tool 9 made of tool steel or the like is moved while being pressed / entered thereon.

In the next sealing step, as shown in FIG. 2, the hermetic part 3 formed in the space between the protruding part 11a and the material 12 to be joined in the joining step is evacuated by a pump in the atmosphere. Alternatively, while evacuating the interior of the vacuum chamber in which the vacuum forming body is placed, the sealing section 21 that connects the hermetic part 3 and the outside as shown in FIG. 5 is closed to complete the vacuum forming body 7. ing.

Next, the joining method used in the joining step in the method of manufacturing a vacuum formed body having such an overall configuration will be described with reference to FIGS. 2, 3, 9 to 11. The joining method of moving the tool 9 rotating at a high speed while pressing and entering as described in the joining step is called a friction stir welding method,
As a result of intensive studies on a joining method applicable to a method of manufacturing a vacuum formed body, the present inventors have found that the above-described various problems can be solved by appropriately using the friction stir welding method.

That is, as shown in FIG.
Is made of a material having a higher strength than the material to be joined, such as tool steel, and has a cylindrical main body 9a and a main body 9a.
And a friction pin 9b protruding coaxially from the center of the lower surface of the head. With the rotation of the friction pin 9b, the friction pin 9b
The overlapping portion 4 in the vicinity is heated by frictional heat, and the materials 11 and 12 that have been softened by heating are so-called “plastic flow”, in which the metal starts to move while undergoing plastic deformation in accordance with the rotation and feed of the tool 9. Is shown. The workpieces fluidized in the horizontal and vertical directions by the plastic flow are sufficiently stirred and mixed by the friction pins 9b, and when the friction pins 9b pass through and are cooled, the workpieces are integrally joined. The part 10 is formed, and the parts 11 and 12 to be joined are firmly joined.

Therefore, in the friction stir welding method, the heat input is smaller than in the case of the inert gas arc welding method, and the inert gas is not used. As a result, thermal distortion can be suppressed and deformation is difficult. In addition, since the overlapped portion is joined while pressing, even if the shape and surface properties of the material to be joined are poor, it is possible to join while firmly contacting, and to combine the material to be joined in a plate shape or the like. When manufacturing vacuum formed bodies of various shapes, a large-scale supporting device is not required, and equipment costs can be reduced.

The joining width 13 of the joining portion 10 formed by the friction stir welding method is wider than the joining width 6 of the inert gas arc welding method shown in FIG. Gaps are hardly formed, and a high vacuum is easily obtained. Further, the bonding strength and airtightness can be greatly improved by the wide bonding portion 10. Further, as described above, the joined parts 11 and 12 that have been plastically fluidized are stirred and mixed with each other,
Immediately thereafter, it is formed by cooling and solidifying, so that a different phase is unlikely to occur, and the airtightness can be maintained higher than in the case of using an auxiliary welding material different from the base material such as inert gas arc welding.

As shown in FIG. 3, a structure in which the inverted portion 4 of the vacuum forming body 7 can be locked on the backing 14 and the tool 9 is pressed from above the material 12 to be joined on the upper plate. By allowing the tool 9 to move while entering, the movement of the tool 9 is not hindered by the protruding portion 11a, so that the joining portion 10 can be formed as close as possible to the airtight portion 3 and gas remains. Material 11 to be joined on the airtight part 3 side
Since there is almost no gap between the holes 12, the vacuum can be quickly evacuated to a predetermined degree of vacuum.

As shown in FIG. 9, the upper and lower surfaces of the overlapping portion 4 are sandwiched by a dummy member 51 so that the tool 9 can be moved while pressing and entering from above. Even when the thickness of the members 11 and 12 is extremely thin, good joint quality can be obtained without occurrence of phenomena such as burn-through due to remarkable plastic flow in the overlapped portion 4. Further, as shown in FIG. 10, both upper and lower plates are plate-shaped materials 53 and 12 having no protruding portions,
Pacers 52 are provided at the ends of the workpieces 53 and 12 so that the tool 9 can be moved while being pressed / entered from above. Since there is no need to use a bonding material, the cost of parts can be reduced, and in addition, since the movement of the tool 9 is not hindered by the projecting portion, the bonding portion 10 can be formed as close as possible to the airtight portion 3. In addition, it is possible to suppress residual gas and quickly evacuate to a predetermined degree of vacuum.

Next, a method of forming a bonding line and a sealing portion in the bonding step will be described with reference to FIGS.
As shown in FIG. 4, the tool 9 is moved along the side surface of the projecting portion 11a of the workpiece 11 on
Forming straight joining lines 17 and 18 at the end 16 and moving the tool 9 along the side surface of the protruding portion 11a from the starting end 22; Extending in the diagonal direction of the joining material 11, joining lines 19 and 20 are formed as the terminal ends 23. These joining lines 17, 18,
The hermetic portion 3 is formed in a portion surrounded by 19 and 20, that is, a portion surrounded by a joining line 25 as shown in FIG.
2 and the terminal ends 16 and 23 are not positioned. That is, at the beginning and the end, the pressurization and rotational force of the tool 9 are insufficient, so that the growth of the joint 10 is small and the surface properties are poor.
Since internal defects are easily generated in the joint portion 10, the start and end of the joint line are provided at positions separated from the joint line 25 forming the airtight portion 3 so that an insufficient joint portion is formed. It is excluded to ensure airtightness.

As shown in FIG. 5, of the joining lines 25 of the hermetic part 3 provided as described above,
A gap that communicates with the outside is formed in a portion surrounded by the refraction points 24 and 24 and the ends 23 and 23 on 9 and 20, and this gap is used as the sealing section 21. The inside of the airtight portion 3 is communicated with the outside through the airtight portion.
That is, in this way, the sealing portion 21 is
Since the sealing portion 21 does not protrude outside from the vacuum forming body 7 by being provided in the inside 12, unlike a conventional pipe or the like protruding from the airtight portion 3, it is hard to break and prevents breakage. Therefore, there is no need to provide a complicated structure. Further, even when the airtight portion 3 is thin, the sealing portion 21 can be easily formed.

Further, a sufficient interval between the bending points 24, 24 corresponding to the length of the sealing portion 21 and the terminal ends 23, 23 is ensured. I can do it. That is, in the conventional inert gas arc welding, if an airtight leak is found,
Even if an attempt is made to remove the welded part once and try to weld it, the properties near the welded part are very poor due to spatter and thermal strain during welding, and almost no re-welding is possible, but by using friction stir welding, Since the properties near the already-joined portion are improved and re-joining can be performed at a position near the already-joined portion, a plurality of joinings for sealing can be easily performed.

For example, as shown in FIG.
The joining line 26 is formed by moving the sealing portion 21 at right angles to the joining line 25, and temporary sealing is performed using the joining line 26 to perform a leak test. Investigate the presence or absence of leaks, and if good airtightness is obtained without leaks,
The joining line 27 is formed near the joining line 26, and the main sealing is performed by the joining line 27. If there is an air leak,
After removing the joining portion of the joining line 26 and re-joining the whole by friction stir welding to improve the airtightness, again,
The joining line 27 is formed while evacuating, and the main sealing is performed by the joining line 27.

Next, a sealing method used in the sealing step will be described with reference to FIGS. First, the sealing method in the atmosphere will be described. As in the sealing portion 21, resealing can be performed in a sealing portion provided in the material to be joined, and the occurrence of defective products due to airtight leakage can be greatly reduced.

On the other hand, if the material to be joined is easily deformed and the gap in the sealing portion 21 cannot be maintained due to the atmospheric pressure when vacuuming is performed in the atmosphere, it is necessary to use a pipe as in the related art. . In this case, as shown in FIG. 7, a connecting pipe 29 communicating with the internal hermetic part 3 is protruded from a side surface of the projecting portion 11a of the material to be joined 11, and the connecting pipe 29 is connected to a pump (not shown). The gas in the hermetic part 3 can be discharged by driving the pump. Dummy plates 30 and 30 are temporarily fixed on the upper and lower portions of the pipe 29, and the dummy plates 30 and 30 are temporarily fixed.
The friction stir welding is performed by moving the rotating tool 9 from the upper surface of the dummy plate 30 to the position 32 to 33 while pressing the rotating tool 9 from the upper surface of the dummy plate 30. Is sealed.

That is, by sealing the connecting pipe by the friction stir welding method in this way, unlike the conventional case where the connecting pipe is pressurized and pressed while heating, the position is slightly shifted without replacing the connecting pipe. It is possible to re-seal simply by removing, and the bonding strength of the bonding portion is higher than that of crimping, so that high airtightness can be reliably maintained.

Next, a method and an apparatus for sealing the sealing portion in the vacuum sealing method will be described. As shown in FIG. 8, on the bottom plate 37a of the vacuum chamber 37, a plurality of supports 38 provided with rolling and sliding members such as balls are provided on the upper part, and on the support 38, A holding table 39 for holding the vacuum forming body 7 is movably mounted in the horizontal direction, and the vacuum forming body 7 is fixed on the holding table 39. Then, from above the vacuum chamber 37, a tool 36 having a base fixed to the joining head 33 penetrates a lid plate 37b above the vacuum chamber 37 and is pressed against the upper surface of the sealing portion 21. The space between 37c and the joining head 33 is covered with an expandable and contractible airtight cover 35. On the other hand, the tip of a plurality of moving arms 41 is fixed to the side surface of the holding table 39, and the base of the moving arm 41 penetrates the side plate 37 d of the vacuum chamber 37 and is provided on the side of the vacuum chamber 37. The space between the drive unit 42 and the penetrating portion 37e is also covered with an expandable and contractible airtight cover 40.

A friction stir welding apparatus 44 having such a vacuum chamber 37 in which the vacuum forming body 7 can be disposed, and a tool 36 which is inserted from the outside of the vacuum chamber 37 to the inside so as to be able to maintain the hermetic state. In a vacuum sealing device 43 comprising a feed device 45 capable of moving the vacuum forming body 7 in the vacuum chamber 37 at a predetermined speed, the moving arm 41 of the feed device 42 is held while pressing and holding the tool 36. The sealing portion 21 can be sealed by moving the holding table 39 so that the tip of the tool 36 moves along the joining line 26 or the joining line 27 by expanding and contracting the tool with the driving portion 42. .

That is, such a vacuum sealing device 43
By sealing the sealing portion 21 by friction stir welding using the method described above, unlike the conventional brazing, no gas is generated due to the flux during the welding, a high degree of vacuum is obtained, and the surface of the material to be welded is obtained. Unlike brazing, in which only joining is performed, friction stir welding, in which the materials to be joined are joined by plastic flow, has higher joining strength and higher airtightness.

[0034]

The present invention is configured as described above.
The following effects are obtained. That is, as in claim 1, a joining step of combining and joining materials to be joined in a predetermined shape and providing an airtight portion inside, and a sealing step of joining and sealing the sealing portion while evacuating the airtight portion. In the method for manufacturing a vacuum formed body comprising, since the friction stir welding method is used in the joining step and the sealing step, the heat distortion can be significantly reduced as compared with the inert gas arc welding method, and the plate-shaped or the like can be joined. Since even materials can be joined while being securely brought into close contact with each other, vacuum formed bodies of various shapes can be manufactured at low cost with simple equipment. Further, the width of the joint can be widened, the generation of a gap in which gas remains can be suppressed, a high vacuum can be easily obtained, and the joint strength and airtightness can be greatly improved. In addition, since the plastic fluidized materials to be joined are stirred and mixed together to form a joint, a different phase is less likely to occur, and the airtightness can be maintained higher.

According to a second aspect of the present invention, when the friction stir welding method is used in the joining step of the first aspect, the starting end and the end of the joining line are provided at positions separated from the joining line forming the hermetic portion. In addition, high airtightness can be maintained by preventing airtight leakage from the start end and the end.

According to a third aspect of the present invention, when the friction stir welding method is used in the joining step of the first aspect, since the sealing portion is provided in the material to be joined, the sealing portion protrudes from the vacuum forming body to the outside. Unlike conventional pipes that are protruded, they are less likely to break, and there is no need to provide a complicated structure to prevent breakage. It can be easily formed.

According to a fourth aspect of the present invention, the sealing portion according to the third aspect is configured to be capable of being sealed a plurality of times by friction stir welding, so that it is possible to easily perform repair for airtight leakage, and Not only the generation of non-defective products can be greatly reduced, but also the vacuum forming body that has leaked airtight during use can be easily recycled.

According to a fifth aspect of the present invention, in the sealing step of the first aspect, after the airtight portion is evacuated by a pump, the connecting pipe connecting the pump and the airtight portion is connected by a friction stir welding method. Therefore, resealing can be performed without replacing the connecting pipe, and the bonding strength of the bonding portion is higher than that of crimping, so that high airtightness can be reliably maintained.

According to a sixth aspect of the present invention, in the sealing step of the first aspect, after the vacuum forming body provided with the hermetic portion is placed in a vacuum chamber, and the hermetic portion is evacuated to seal the hermetically sealed portion, Since the tool is inserted from the outside of the vacuum chamber to the inside so that it can be kept airtight, and the sealing portion is sealed by the friction stir welding method with the tool, unlike the conventional brazing, the gas due to the flux during the welding is different from the conventional brazing. There is no generation, a high degree of vacuum can be obtained, and the joining strength is higher than that of brazing, and high airtightness can be obtained.

According to a seventh aspect of the present invention, there is provided a vacuum-formed body for combining and joining members having a predetermined shape to form a hermetically sealed portion therein, and then joining and sealing the sealing portion while evacuating the hermetically sealed portion. In a manufacturing apparatus, a vacuum chamber capable of disposing a vacuum forming body therein, a friction stir welding apparatus having a tool inserted so as to be able to maintain the airtight from the outside to the inside of the vacuum chamber, and a vacuum forming body in the vacuum chamber Since the apparatus has a sealing device in a vacuum composed of a feeding device movable at a predetermined speed, the sealing in the vacuum by the friction stir welding of the sealing portion can be reliably performed by a simple device.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vacuum forming body according to the present invention in which peripheral edges are joined by a friction stir welding method.

FIG. 2 is a sectional view of the same.

FIG. 3 is a cross-sectional view of a vacuum formed body when a backing is applied to a material-to-be-joined provided with a protrusion.

FIG. 4 is a plan view of the vacuum forming body showing a joining line.

FIG. 5 is a plan view of the vacuum forming body showing a joining line of the hermetic part.

FIG. 6 is a plan view of a vacuum forming body showing a joining line for sealing.

FIG. 7 is a perspective view of a sealing portion for performing sealing in the atmosphere by a friction stir welding method.

FIG. 8 is a side cross-sectional view of a vacuum sealing device that performs vacuum sealing by a friction stir welding method.

FIG. 9 is a perspective view of a vacuum forming body in which the upper and lower surfaces of an overlapping portion are sandwiched between dummy members.

FIG. 10 is a perspective view of a vacuum forming body in which a material to be joined is not provided with a protrusion.

FIG. 11 is a cross-sectional view of a vacuum formed body by a conventional inert gas arc welding method.

[Explanation of symbols]

 Reference Signs List 3 Hermetic part 7 Vacuum forming body 9.36 Tool 11.12 Materials to be joined 15.22 Start end 16.23 End 17.18.19.20 Joining line 21 Sealing part 29 Connecting pipe 37 Vacuum chamber 43 Vacuum sealing device 44 Friction stir welding device 45 Feeder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Keiji Sakamoto 1-5-2 Minatojima Minamimachi, Chuo-ku, Kobe City Inside the New Industry Creation Research Organization (72) Inventor Hiroshi Shikata 1-chome, Minatojima Minamicho, Chuo-ku, Kobe City No. 5-2 F-term in the New Industry Creation Research Organization (Reference) 3H036 AA08 AB28 AC01 AE13 4E067 BG00 CA04 DB01 EA08 EB00 EC02

Claims (7)

[Claims] 1. A vacuum forming method comprising: a joining step of combining and joining materials having a predetermined shape to form an airtight portion inside; and a sealing step of joining a hermetically sealed portion while hermetically sealing the hermetically sealed portion to form a vacuum. A method for manufacturing a vacuum formed body, wherein a friction stir welding method is used in the joining step and the sealing step. 2. The method according to claim 1, wherein, when using the friction stir welding method in the joining step, a starting end and a terminating end of the joining line are provided at positions separated from a joining line forming the airtight portion. Manufacturing method of vacuum formed body. 3. The method of manufacturing a vacuum formed body according to claim 1, wherein a sealing portion is provided in the material to be joined when using the friction stir welding method in the joining step. 4. The structure according to claim 3, wherein the sealing portion can be sealed a plurality of times by friction stir welding.
A method for producing a vacuum formed body as described above. 5. In the sealing step, after the airtight portion is evacuated by a pump, a connecting pipe connecting the pump and the airtight portion is connected by a friction stir welding method. A method for manufacturing a vacuum formed body according to claim 1. 6. In the sealing step, after disposing a vacuum forming body provided with a hermetic portion in a vacuum chamber, and then sealing the sealing portion by evacuating the hermetic portion, from outside to inside of the vacuum chamber. The method for manufacturing a vacuum formed body according to claim 1, wherein a tool is inserted so as to be able to maintain airtightness, and the sealing part is sealed by a friction stir welding method with the tool. 7. A vacuum forming body manufacturing apparatus for combining and joining members to be joined in a predetermined shape to form a hermetically sealed portion therein, and then joining and sealing the sealing portion while evacuating the hermetically sealed portion. A vacuum chamber capable of disposing the formed body therein, a friction stir welding apparatus having a tool inserted from the outside of the vacuum chamber to the inside so as to be able to maintain the airtight, and a vacuum formed body in the vacuum chamber can be moved at a predetermined speed. An apparatus for manufacturing a vacuum formed body, comprising: a vacuum sealing device comprising a simple feeding device.