TWI755967B - Method for manufacturing a metal structure and the metal structure - Google Patents

Abstract

The present invention provides a method of manufacturing a metal structure capable of suppressing or preventing occurrence of defects in a joint portion and complication of manufacturing steps, and ensuring a degree of freedom of design. In the method for producing a metal structure of the present invention, the metal structure includes two metal members joined by friction stir welding in a state of overlapping each other in the vertical direction, and the two metal members are formed by overlapping each other in the vertical direction. An assembly having an internal space between two metal members, the assembly having: a discontinuous portion, which is configured to be in contact with or without mutual engagement by the two metal members at a position exposed to the internal space inside the assembly. The two metal members are close to each other and the two metal members are discontinuous; and the non-joining portion is formed so that the two metal members are in contact with or approach without being joined to each other at a position inside the assembly that is not exposed to the inner space, and the two metal members have The borders with each other are physically continuous with the discontinuous part; the non-joining part includes an upper part, and the upper part is at a position shallower than the discontinuous part when the assembly is viewed from a vertical direction, taking the upper surface of the assembly as the benchmark The two metal members are contacted or approached in the vertical direction without being joined to each other, the discontinuous portion and the upper portion are each formed so as to surround the inner space when the assembly is viewed from the vertical direction, and the manufacturing method includes: a preparation step of preparing two A metal member; an assembling step of forming an assembly by overlapping two metal members in a vertical direction; and a joining step of rotating a tool for friction stir welding and inserting it from the upper surface of the assembly to the joining depth, When viewed from the vertical direction, it moves along the upper portion to form a joint portion for joining the two metal members, and the joint portion is formed so that the non-joint portion remains at the inner position that communicates with the internal space through the discontinuous portion; joint depth It is the depth where the friction stir welding reaches the upper part but does not reach the depth of the discontinuous part.

Description

Manufacturing method of metal structure, and metal structure

The present invention relates to a method for producing a metal structure, and the metal structure.

As a conventional metal structure, there is a metal structure including a main body part and a cover part. A cover groove is formed on the main body. A groove is formed on the bottom surface of the cover groove of the main body. The cover portion is fitted into the cover groove. The body portion at the periphery of the cover groove is engaged with the cover portion. Thereby, the space enclosed by the groove and the cover becomes an internal space, and can be used as a flow path of the fluid. Such a metal structure can be used as a heat transfer metal structure. For example, the metal structure for heat transfer is arranged so as to be in contact with or close to an object to be heat exchanged, heated or cooled. For example, when heat is released from the object, the heat of the object can be released by allowing the cooling medium to flow into the flow path to transfer the heat from the object to the metal body and the cooling medium.

Patent Document 1 discloses a technique for joining a body portion and a lid portion at the periphery of a lid groove by friction stir welding with respect to a metal structure.

[Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2014-240706

An object of the present invention is to provide a method for manufacturing a metal structure and a metal structure capable of suppressing or preventing the occurrence of defects in the joint portion and complicating the manufacturing steps and ensuring the degree of freedom of design.

The present inventors have studied the above-mentioned problems and obtained the following knowledge.

FIGS. 1( a ) and ( b ) are cross-sectional views schematically showing the state of joining the body portion 101 and the lid portion 102 by friction stir welding. In addition, here, the cross-sectional view refers to a cross-sectional view obtained from a plane orthogonal to the direction in which the internal space 103 serving as the flow path of the fluid extends.

As shown in FIG. 1( a ), the distance GD in the horizontal direction between the body portion 101 and the cover portion 102 (the passing position of the front end portion 105a of the tool 105 ) and the interior space 103 is relatively large. The reason for this is that, as shown in FIG. 1( b ), when the distance GD is short, the metal base material 103 a may enter the inner space 103 during friction stir welding, and a defect may occur at the joint. Therefore, either of the following (i) or (ii) is required.

(i) Design the metal structure so as to sufficiently secure the distance GD.

(ii) Use a joining method other than friction stir welding for the portion where it is difficult to secure the distance GD.

As described in (i) above, when designing to sufficiently secure the distance GD, for example, it is difficult to arrange the inner space 103 densely, and the degree of freedom of design of the metal structure is limited. On the other hand, as described in (ii) above, when friction stir welding is combined with other joining methods, there is a problem that the manufacturing steps are complicated.

FIGS. 2( a ) and ( b ) are longitudinal cross-sectional views schematically showing a state in which the main body portion 101 and the lid portion 102 are joined by friction stir welding. In addition, the longitudinal cross-sectional view mentioned here means the cross-sectional view obtained by the plane parallel to the direction in which the internal space 103 which is a flow path of a fluid extends. However, since FIGS. 2(a) and (b) are longitudinal sectional views based on the passing position of the tool 105, the inner space 103 is not shown.

In FIG. 2( a ), the cover portion 102 is inserted into a cover groove (not shown) formed in the main body portion 101 . The tool 105 of the friction stirring device (not shown) has a cylindrical shape and has a thin front end 105a. The front end portion 105a of the tool 105 is inclined with respect to the vertical direction VD so as to be positioned further forward in the advancing direction of the tool 105 . This inclination angle D (advance angle) is, for example, preferably more than 0 degrees and 5 degrees or less, and more preferably 1 degree or more and 4 degrees or less. However, in the state where the tool 105 has the inclination angle D, if the tool 105 is moved in the advancing direction PD, the cover portion 102 will be deformed as shown in FIG. 2(b) in front of the advancing direction PD. . The ease or amount of such deformation increases in proportion to the size of the tool 105 (ie, the load). Therefore, when the thickness of the cover portion 102 is large, the cover portion 102 is easily deformed during friction stir welding, and the tool 105 of the friction stir device is easily damaged. Therefore, it is sometimes difficult to use a thick cover 102, while the design freedom of metal structures is limited. Furthermore, when the cover 102 with a large thickness is used, if the size of the tool 105 is increased in order to ensure the mechanical strength of the tool 105, it is necessary to ensure a larger joint portion, and thus the design freedom of the metal structure is further limited. In addition, since a measure for preventing or suppressing deformation of the cover portion 102 is required, there arises a problem that the manufacturing steps are complicated.

The present inventors have completed the present invention based on the above knowledge. As an embodiment of the present invention, the following configurations can be employed.

(1) A method of manufacturing a metal structure, wherein the metal structure includes two metal members, the two metal members are joined by friction stir welding in a state of overlapping each other in the vertical direction, and the two metal members are configured by Since the above-mentioned vertical directions overlap each other, an assembly having an inner space between the two metal members is formed, and the assembly has a discontinuous portion, which is formed at a position inside the assembly that is exposed to the inner space, The above-mentioned two metal members are discontinuous because the above-mentioned two metal members are contacted or approached without being joined to each other; The two metal members are in contact with or approach without being joined to each other, but the above-mentioned two metal members have a boundary with each other and are physically continuous with the above-mentioned discontinuous portion; the above-mentioned non-joint portion includes an upper side portion, and the above-mentioned upper side portion is viewed from the above-mentioned vertical direction. In the case of the above-mentioned assembly, with the upper surface of the above-mentioned assembly as a reference, at a position shallower than the above-mentioned discontinuous portion, the above-mentioned two metal members are in contact with or approached in the above-mentioned vertical direction without being joined to each other, and the above-mentioned discontinuous portion and the above-mentioned upper portion Each is formed so as to surround the above-mentioned inner space when the above-mentioned assembly is viewed from the above-mentioned vertical direction, The above-mentioned manufacturing method includes: a preparation step of preparing the two metal members; an assembly step of forming the assembly by overlapping the two metal members in the vertical direction; and a joining step of making the friction stir welding use The tool is inserted from the upper surface of the assembly to the joint depth while rotating, and moves along the upper part when viewed from the vertical direction, thereby forming a joint for joining the two metal members, and the joint is used to connect the above The non-joining portion is formed so as to remain at an inner position that communicates with the internal space through the discontinuous portion; the joining depth is the depth where the friction stir welding reaches the upper portion but does not reach the discontinuous portion.

According to the manufacturing method of (1), in the joining step, the tool is inserted into the assembly so that the friction stir welding reaches the upper portion but does not reach the discontinuous portion. The upper portion is located shallower than the discontinuous portion. Since the formation of the joint is performed at a shallower position, the tool is not inserted into a deeper position. The load applied to the metal structure can be reduced during welding, and the tool for friction stir welding can be suppressed or prevented from increasing in size. Deformation of metal components can be suppressed or prevented. Metal members with larger thicknesses can be used. Since the distance between the insertion position of the tool and the inner space can be secured, it is possible to suppress or prevent the occurrence of a situation in which the metal base material flows into the inner space due to friction stir welding. In addition, the friction stir welding is performed by overlapping the upper part of two metal members in the vertical direction to form a joint part. Therefore, the occurrence of defects in the joint portion can be prevented.

From the above, according to the manufacturing method of (1), it is possible to prevent the occurrence of defects, and to improve the Design freedom for high metal structures. Moreover, according to the manufacturing method of (1), since it can join in a shallow position, it is easy to use friction stir welding. It is not necessary to combine friction stir welding with other joining methods, and it is possible to adopt a structure that can be joined only by friction stir welding. However, the joining of two metal members in the metal structure of (1) is not necessarily limited to friction stir welding. Welding methods other than friction stir welding may also be used together with friction stir welding. By adopting the manufacturing method of (1), the degree of freedom of design is improved, and a structure in which the joining of two metal members is easy can be adopted, and the disadvantages caused by the combination of joining methods can be reduced.

(2) The manufacturing method according to (1), wherein in the joining step, the joining portion is formed such that the non-joining portion has a portion extending in the vertical direction at the inner position.

According to the manufacturing method of (2), since the non-joint portion has the portion extending in the vertical direction at the inner position, the distance between the discontinuous portion and the joint portion can be secured in the vertical direction. Therefore, for example, even if the distance in the horizontal direction between the discontinuous portion and the joining portion is not sufficiently secured, the distance between the discontinuous portion and the joining portion can be secured. As a result, for example, the interior space can be arranged more densely. The generation of defects can be suppressed, and the complication of manufacturing steps can be suppressed or prevented, and the degree of freedom of design can be improved.

(3) The manufacturing method according to (1) or (2), wherein in the joining step, the joining portion is such that the non-joining portion remains on the outside not communicating with the internal space in addition to the inner position. position is formed.

According to the manufacturing method of (3), the joining part is formed so that the non-joining part remains on both sides of the joining part (that is, two places of an inner side position and an outer side position). The generation of voids in the joint can be suppressed or prevented. As a result, it is possible to prevent the occurrence of defects in the metal structure, in particular, to prevent the occurrence of defects in the internal space, and it is possible to avoid complication of manufacturing steps, and to improve the degree of freedom of design of the metal structure.

Furthermore, since there is a junction between the outer non-joining portion (the non-joining portion remaining at the outer position) and the inner space, the outer non-joining portion does not communicate with the inner space. However, when the metal structure has another internal space, the above-mentioned outer non-joining portion may also communicate with the other internal space. The outer non-joining portion corresponds to the inner non-joining portion when viewed on the basis of the other internal space. In addition, the outer non-joining portion may communicate with the outside of the metal structure.

(4) The manufacturing method according to any one of (1) to (3), wherein the upper portion surrounds the inner space at a position that does not overlap the inner space when the assembly is viewed from the vertical direction. The discontinuous portion is formed so as to surround the inner space along the outer periphery of the inner space when the assembly is viewed from the vertical direction.

According to the manufacturing method of (4), it is possible to prevent the occurrence of defects in the metal structure, in particular, to prevent the occurrence of defects in the internal space, and to avoid complication of the manufacturing steps, and to improve the degree of freedom of design of the metal structure.

(5) The manufacturing method according to any one of (1) to (4), wherein The two metal members are a main body portion and a cover portion, the main body portion has a shoulder portion formed so as to protrude toward the upper surface of the assembly body at a position corresponding to the upper side portion when viewed from the vertical direction, and the above-mentioned The lid portion has a bottomed groove formed so as to receive the shoulder portion when the lid portion and the body portion overlap, and the engagement depth is the depth where the friction stir welding reaches the shoulder portion but does not reach the depth of the discontinuous portion. .

According to the manufacturing method of (5), it is possible to prevent the occurrence of defects in the metal structure, in particular, to prevent the occurrence of defects in the internal space, and to avoid complication of the manufacturing steps, and to improve the degree of freedom of design of the metal structure.

(6) The manufacturing method according to (5), wherein the main body portion has a cover groove on the surface into which the cover portion is fitted, and the shoulder portion has a protrusion protruding from the bottom surface of the cover groove toward the upper surface of the assembly. The cover portion is formed to have a shape that can be fitted into the cover groove, and the shoulder portion is received by the bottomed groove when the cover portion is fitted into the cover groove.

According to the manufacturing method of (6), it is possible to prevent the occurrence of defects in the metal structure, in particular, to prevent the occurrence of defects in the internal space, and to avoid complication of the manufacturing steps, and to improve the degree of freedom of design of the metal structure.

(7) The manufacturing method according to any one of (1) to (6), wherein The above-mentioned metal structure system is a metal structure for heat transfer which is installed so as to be in contact with or close to an object to be heat exchanged, heated or cooled.

According to the manufacturing method of the above-mentioned (7), the occurrence of defects can be prevented, and the degree of freedom of design of the metal structure can be improved, and the degree of freedom of design of the interior space in particular can be improved. By setting the internal space as the flow path of the fluid, for example, a metal structure in which the flow path excellent in the airtightness of the fluid is densely arranged can be realized. That is, a metal structure having excellent heat transfer properties can be realized due to high airtightness and design freedom. That is, according to the manufacturing method of (7), the metal structure suitable for heat transfer can be manufactured.

(8) The metal structure according to any one of (1) to (6), wherein the metal structure system uses a hollow metal structure in a state where the inner space is a cavity.

According to the manufacturing method of the above-mentioned (8), the occurrence of defects can be prevented, and the degree of freedom of design of the metal structure can be improved, especially the degree of freedom of design of the inner space can be improved. By setting the internal space as a cavity, for example, a metal structure in which the cavities are densely arranged can be realized. That is, it is possible to realize a hollow metal structure with a high degree of design freedom related to the combination of the mechanical strength, weight, and size of the structure.

(9) A metal structure having an inner space provided inside the metal structure; A discontinuous portion, which is configured such that the two metal portions are discontinuous by contacting or approaching without being joined to each other at a position where the two metal portions constituting the metal wall portion defining the internal space are exposed to the internal space; The inner non-joining portion is configured such that the two metal portions are in contact with or approach without being joined to each other at a position inside the metal structure that is not exposed to the internal space, and the two metal portions have a boundary and are formed At the inner position that communicates with the inner space through the discontinuous portion; and the junction, which is not exposed to the inner space in the position inside the metal structure, the boundary between the two metal parts cannot be recognized or difficult to recognize One end of the above-mentioned inner non-joint portion is closed by means of identification; the above-mentioned joint portion is located in one or substantially a plane, and is formed in a manner that surrounds the above-mentioned inner space when viewed from a vertical direction perpendicular or substantially perpendicular to the above-mentioned plane, the above-mentioned The discontinuous portion is formed so as to surround the inner space when viewed from the vertical direction, and the inner non-joint portion has a portion extending in the vertical direction, so that the discontinuous portion and the joint portion are located at different positions in the vertical direction. high.

According to the metal structure of (9), it is possible to prevent the occurrence of defects in the metal structure, in particular, to prevent the occurrence of defects in the internal space, and to avoid complication of manufacturing steps, and to improve the degree of freedom of design of the metal structure.

(10) The metal structure according to (9), wherein the metal structure further has an outer non-joining portion, and the outer non-joining portion is configured as At a position inside the metal structure that is not exposed to the internal space, the two metal parts have a boundary because the two metal parts are in contact or approach without being joined to each other, and are located on the outer side that does not communicate with the internal space. position, one end is closed by the above-mentioned joint.

The metal structure of the above (10) is manufactured such that the inner non-joining portion and the outer non-joining portion are located on both sides of the joining portion. It is possible to suppress or prevent the generation of voids in the joint during manufacture.

(11) The metal structure according to (9) or (10), wherein the metal structure is a metal structure for heat transfer in which the above-mentioned metal structure is placed in contact with or in proximity to an object to be heat exchanged, heated or cooled.

According to the metal structure of the above (11), the occurrence of defects can be prevented, and the degree of freedom of design of the metal structure can be improved, especially the degree of freedom of design of the interior space can be improved. By setting the internal space as the flow path of the fluid, for example, a metal structure in which the flow path excellent in the airtightness of the fluid is densely arranged can be realized. That is, a metal structure having excellent heat transfer properties can be realized due to high airtightness and design freedom. That is, the metal structure of (11) is suitable for heat transfer.

(12) The metal structure according to (9) or (10), wherein the metal structure system uses a hollow metal structure in a state where the inner space is a cavity.

According to the manufacturing method of the above (12), the occurrence of defects can be prevented, and the degree of freedom of design of the metal structure can be improved, especially the degree of freedom of design of the inner space can be improved. by dividing the interior space As a cavity, for example, a metal structure in which cavities are densely arranged can be realized. That is, it is possible to realize a hollow metal structure with a high degree of design freedom related to the combination of the mechanical strength, weight, and size of the structure.

According to the present invention, it is possible to suppress or prevent the occurrence of defects in the joint portion and the complication of the manufacturing steps, and to ensure the degree of freedom of design.

1: Main body

1a: Metal part

1b: outer surface

1d: first division forming surface

1s: surface

2: Cover

2a: Metal part

2b: Contact surface

2c: upper surface

2d: Second division forming surface

3: Internal space (recess)

3a: Through hole

3b: Metal wall

3c: discontinuous part

3d: Medial non-joint

3e: (one of the inner non-joint parts) one end

3f: Joint

3g: (one of the outer non-joint parts) one end

3h: Outside non-joint part

3n: non-joint part

4: shoulder

5: Tools

5a: Front end

6: Bottom slot

7: Cover slot

10: Metal Structure

10a: Assembly

101: Body part

102: Cover

103: Interior Space

103a: Metal base metal

105: Tools

105a: Front end

D: inclination angle

GD: distance

OD: depth

PD: the way forward

S: Flat

SD: Depth

T: Thickness

VD: vertical direction

WD: Depth

FIGS. 1( a ) and ( b ) are cross-sectional views schematically showing a state in which a main body portion and a lid portion are joined by friction stir welding.

FIGS. 2( a ) and ( b ) are cross-sectional views schematically showing a state in which the main body portion and the lid portion are joined by friction stir welding.

Fig. 3(a) is a plan view schematically showing a metal structure, and Fig. 3(b) is a cross-sectional view taken along the line A-A in Fig. 3(a).

FIGS. 4( a ) to ( c ) are cross-sectional views showing manufacturing steps of the metal structure of the embodiment.

FIG. 5 is a cross-sectional view schematically showing the main body portion and the cover portion being joined.

FIG. 6( a ) is a plan view schematically showing a metal structure of another embodiment, and FIGS. 6( b ) to ( e ) are cross-sectional views showing the manufacturing steps thereof, corresponding to the cross-sectional views taken along the line B-B in FIG. 6( a ).

FIG. 7( a ) is a cross-sectional view schematically showing a main body portion and a cover portion in the joining of the conventional metal structures, and FIG. 7( b ) is a cross-sectional view schematically showing the main body portion and the cover portion in the joining of the embodiment. .

8(a) and 8(b) are cross-sectional views schematically showing a conventional metal structure, and FIG. 8(c) And FIG.8(d) is sectional drawing which shows typically the metal structure of embodiment.

FIG. 9 is a cross-sectional view schematically showing a metal structure of another embodiment.

10 is a cross-sectional view schematically showing a method of manufacturing a metal structure according to another embodiment.

<<The metal structure of an embodiment>>

First, the metal structure 10 of one embodiment will be described. FIG. 3( a ) is a plan view schematically showing the metal structure 10 . Fig. 3(b) is a cross-sectional view taken along the line A-A of Fig. 3(a).

The metal structure 10 has the internal space 3, the discontinuous part 3c, the inner non-joining part 3d, the joining part 3f, and the outer non-joining part 3h.

The metal structure 10 is a plate-like body. As shown in FIG. 3( a ), the metal structure 10 has a rectangular shape extending in the longitudinal direction (the vertical direction in FIG. 3( a )) in plan view. As shown in FIG.3(b), the metal structure 10 has a cross-sectional rectangular shape. The metal structure 10 is comprised so that it may contain the metal part 1a and the metal part 2a. The metal portion 1a and the metal portion 2a are joined to each other in the joining portion 3f. The metal structure 10 is made of copper. That is, the metal part 1a and the metal part 2a contain copper. The metal constituting the metal structure 10 is not particularly limited. As the metal, for example, copper, aluminum, or an alloy containing at least one of these can be cited. In addition, the metal part 1a and the metal part 2a may consist of mutually the same metal, and may consist of different metals.

The inner space 3 is provided inside the metal structure 10 . The inner space 3 has a longer than A shape extending in the side direction (up-down direction in Fig. 3(a)). The shape of the inner space is not particularly limited. The inner space can be either U-shaped or zigzag-shaped. The number of internal spaces in one metal structure is not particularly limited, and may be one or plural. The inner space 3 is divided and formed by the metal wall portion 3b. The metal wall portion 3b is constituted by a portion of the metal structure 10 exposed to the inner space 3 . The metal wall portion 3b includes a portion constituted by the metal portion 1a and a portion constituted by the metal portion 2a. The metal portion 1a corresponds to the main body portion 1 described below. The metal portion 2a corresponds to the cover portion 2 described below. The metal part 1a and the metal part 2a are integrated by joining in the joining part 3f.

The discontinuous portion 3c is a portion formed so that the metal portion 1a and the metal portion 2a are discontinuous by contacting or approaching without being joined to each other at the position where the metal portion 1a and the metal portion 2a are exposed to the inner space 3 . The discontinuous portion 3c is formed so as to surround the inner space 3 when viewed from the vertical direction X.

The inner non-joining portion 3d is a portion that is configured so that the metal portion 1a and the metal portion 2a are in contact with or approach without being joined to each other at a position of the metal structure 10 that is not exposed to the inner space 3, and the metal portion 1a and the metal portion 2a are not joined to each other. The metal part 2a has a boundary, and is formed in the inner position which communicates with the internal space 3 via the discontinuous part 3c. That is, one end 3e of the inner non-joining portion 3d is closed by the joining portion 3f, and the discontinuous portion 3c corresponds to the other end of the inner non-joining portion 3d. The inner non-joint portion 3d has a portion extending in the vertical direction X, so that the discontinuous portion 3c and the joint portion 3f are located at different heights in the vertical direction X. As shown in FIG. The inner non-engagement portion 3d is located at the inner side of the engagement portion 3f. In addition, the inner side position of the joint part 3f refers to a position which is relatively close to the inner space 3 and communicates with the inner space 3 via the discontinuous part 3c. On the other hand, the outer position of the joint portion 3 f refers to a position relatively far from the inner space 3 and not communicating with the inner space 3 .

The joint portion 3f is a portion where one end of the inner non-joint portion 3d is connected at a position where the metal structure 10 is not exposed to the inner space 3 in such a way that the boundary between the metal portion 1a and the metal portion 2a cannot be recognized or is difficult to recognize. 3e is closed. Furthermore, there is no need to strictly distinguish whether the junction is unrecognizable or difficult to recognize. The inflow and outflow of the fluid can be blocked between the inner position and the outer position of the joint portion 3f. The engaging portion 3f is located in one plane S. Plane S is a virtual plane. The vertical direction X refers to the direction that intersects the plane S perpendicularly or substantially perpendicularly. That is, the joint portion 3f is located at the same or substantially the same height (depth) in the vertical direction X. As shown in FIG. The plane S can also have a width in the vertical direction X. The plane S including the joint portion 3f is included in the metal portion 2a. In other words, the joint portion 3f is formed on the metal portion 2a. Moreover, the junction part 3f is formed so that the internal space 3 may be enclosed as shown to FIG.3(a) when it sees from the vertical direction X. As shown in FIG.

The outer non-joining portion 3h is a portion that is configured so that the metal portion 1a and the metal portion 2a are in contact with or approach without being joined to each other at a position of the metal structure 10 that is not exposed to the inner space 3, and the metal portion 1a and the metal portion 2a are in contact with each other. The metal portion 2a has a boundary, and the outside non-joining portion 3h is located at the outside position, and one end 3g is closed by the joint portion 3f. The other end of the outer non-joining portion 3h may be communicated with the outside of the metal structure 10 . When the metal structure 10 has another internal space 3 , the other end of the outer non-joining portion 3 h may also communicate with the other internal space 3 . Furthermore, depending on the structure of the metal structure, there is a case where there is no outer non-joining portion at the outer position.

The inner space 3 communicates with the outside of the metal structure 10 through the through hole 3a formed in the metal portion 2a. As shown in FIG. 3( a ), two through holes 3 a are formed in the metal portion 2 a. The through hole 3a is used as an injection port or a discharge port of a fluid such as a refrigerant, for example. Furthermore, the number of the through holes 3a is not particularly limited Certainly. The through hole 3a may be one or plural. The through hole 3a is formed only in the metal portion 2a, but may be formed only in the metal portion 1a, or may be formed in both the metal portion 1a and the metal portion 2a.

The through hole 3a is formed in the metal part 2a. As described above, the joint portion 3f is also formed on the metal portion 2a. Thus, it is preferable that the through-hole 3a and the junction part 3f are formed in one metal part 2a, and are not formed in the other metal part 1a. Thereby, the fluid flow between the internal space 3 and the outside of the metal structure 10 via the metal portion 1a is prevented. For example, when a fluid such as a refrigerant flows into the inner space 3, the leakage of the fluid from the metal part 1a is prevented. Therefore, the metal portion 1a can be suitably used as a heat transfer surface in contact with or in proximity to an object to be heat exchanged, heated or cooled. In this embodiment, the metal portion 1a has a heat transfer surface, but the metal portion 2a may also have a heat transfer surface. Moreover, as shown in FIG.3(a), it is preferable that the internal space 3 is sealed except the through-hole 3a by forming the joint part 3f over the whole outer periphery of the internal space 3. As shown in FIG. In addition, the through-hole 3a is not an essential structure.

The use of the metal structure 10 is not particularly limited. For example, the metal structure 10 may be used as a hollow metal structure in a state where the inner space 3 is a cavity. In addition, the metal structure 10 may be a metal structure for heat transfer provided so as to be in contact with or close to an object to be heat exchanged, heated or cooled. The metal structure 10 has the internal space 3 excellent in airtightness. That is, the main body part 1 and the cover part 2 joined to each other in the joint part 3 f can block the inflow and outflow of the fluid between the inner space 3 and the outside of the metal structure 10 . The metal structure 10 can be appropriately used so that the inner space 3 functions as a fluid flow path or a storage portion. The fluid is, for example, a gas or a liquid. When the metal structure 10 is used as a heat transfer metal structure, the fluid is, for example, a heat transfer fluid such as a refrigerant.

<<Manufacturing method of metal structure of one embodiment>>

Next, with reference to FIGS. 4( a ) to ( c ) and FIG. 5 , a method of manufacturing the metal structure 10 according to one embodiment will be described.

<Preparation steps>

First, in the preparation step, as shown in FIG. 4( a ), the main body portion 1 is prepared, and as shown in FIG. 4( b ), the cover portion 2 is prepared. The main body part 1 and the cover part 2 correspond to "metal members", respectively.

The main body portion 1 contains a metal material. The metal material is not particularly limited as long as it is a metal material that can plastically flow by being softened by frictional heat by friction stirring. As the metal material, for example, copper, aluminum, or an alloy containing at least one of these can be cited. The main body portion 1 is a plate-like body. The main body part 1 is a long plate-shaped body. The shape of the main body portion 1 is not limited to a plate-like body.

As shown in FIG. 4( a ), the main body 1 has a first dividing surface 1 d for dividing and forming the internal space 3 . In this embodiment, the inner space 3 corresponds to the space formed in the groove of the main body portion 1 . The first division forming surface 1d corresponds to the surface of the groove formed in the main body portion 1 . The inner space 3 is formed by dividing the first dividing surface 1 d of the main body 1 and the second dividing surface 2 d of the cover 2 shown in FIG. 4( b ). A shoulder 4 is formed on the outer side of the first division forming surface 1d as shown in FIG. 4( a ).

The cover part 2 contains a metal material. The metal material is not particularly limited as long as it is a material that can plastically flow by being softened by frictional heat by friction stirring. As the metal material, for example, copper, aluminum, or an alloy containing at least one of these can be exemplified. The material of the cover portion 2 may be the same or substantially the same as the material of the body portion 1 , or may be different from the material of the body portion 1 .

As shown in FIG.4(b), the cover part 2 has the 2nd division formation surface 2d which divides and forms the internal space 3 with the 1st division formation surface 1d. As shown in FIG. 4( b ), the cover portion 2 has a contact surface 2 b that abuts against the outer surface 1 b of the body portion 1 when the cover portion 2 is placed on the body portion 1 . A bottomed groove 6 for receiving the shoulder 4 is formed on the contact surface 2b. The bottomed groove 6 is a bottomed groove. The cross-sectional shape of the bottomed groove 6 is rectangular. In addition, in this embodiment, the 1st division formation surface 1d is a recessed part, and the 2nd division formation surface 2d is a flat surface. However, the first division formation surface 1d may be a flat surface, and the second division formation surface 2d may be a concave portion. Moreover, both the 1st division formation surface 1d and the 2nd division formation surface 2d may have a recessed part.

<Assembly step>

In the assembling step, as shown in FIG. 4( c ), the cover portion 2 is placed on the body portion 1 in such a manner that the shoulder portion 4 of the body portion 1 is received by the bottomed groove 6 of the cover portion 2 . Thereby, the assembly 10a having the inner space 3 is formed. In the assembly 10a, in the vertical direction, the main body portion 1 is positioned below, and the lid portion 2 is positioned above. The assembly 10a has the discontinuous portion 3c and the non-joining portion 3n. The discontinuous portion 3c is a portion configured so that the body portion 1 and the lid portion 2 come into contact with or approach the body portion 1 and the lid portion 2 in a position exposed to the inner space 3 of the assembly 10a without being joined to each other. have mutual boundaries. The non-joining portion 3n is configured such that the body portion 1 and the lid portion 2 are in contact with or approach each other in a position not exposed to the inner space of the assembly 10, and the body portion 1 and the lid portion 2 have a boundary with each other. The non-joining portion 3 n is the boundary between the main portion 1 and the cover portion 2 . The non-joining portion 3n is in physical communication with the discontinuous portion 3c which is the boundary between the main body portion 1 and the lid portion 2 in the same manner. In the assembly 10a, the non-joining portion 3n includes the upper portion 8. As shown in FIG. The upper portion 8 is a portion that is shallower than the discontinuous portion 3c with the upper surface 2c of the assembly 10a as a reference when the assembly 10a is viewed from the vertical direction X. The body portion 1 and the lid portion 2 are in contact with or approached in the vertical direction X without engaging with each other. The upper side portion 8 is the portion where the shoulder portion 4 and the bottomed groove 6 overlap in the vertical direction X. As shown in FIG. The discontinuous portion 3c and the upper portion 8 are formed so as to surround the inner space 3 when the assembly 10a is viewed from the vertical direction X (see FIG. 3( a )).

<Joining step>

As shown in FIG. 5, the joining step is performed on the assembly 10a. In the joining step, the body portion 1 and the lid portion 2 are joined by friction stir welding. Tool 5 of a friction stir device (not shown) is used for this joining step. The tool 5 is formed of a material with high heat resistance and wear resistance. The tool 5 is a cylindrical body having a tapered front end portion 5a at the front end. The tool 5 is controlled by a drive device included in the friction stirring device so as to move while rotating. Specifically, the tool 5 can perform relative up-and-down movement with respect to the main body portion 1 and the cover portion 2 and relative parallel movement with respect to the main body portion 1 and the cover portion 2 while rotating. The lift movement is the movement in the vertical direction X. The parallel movement is the movement in the direction perpendicular to the vertical direction X. On the front end portion 5a of the tool 5, a helical thread groove (not shown) is provided on the outer peripheral surface.

In the joining step, while the tool 5 is rotated, the upper surface 2c of the assembled body 10a is inserted to the joining depth in the cover 2 . The upper surface 2c of the assembly 10a corresponds to the surface on the opposite side of the contact surface 2b in the cover portion 2 . FIG. 5 shows a state in which the tool 5 is inserted up to the engagement depth while being rotated. The engagement depth is the depth WD of the friction stir welding that reaches the shoulder portion 4 received by the bottomed groove 6, but does not reach the outer side surface 1b (the discontinuous portion 3c). In other words, the welding depth is set so that the depth WD of the friction stir welding satisfies the depth SD≦WD<depth OD. Furthermore, as shown in FIG. 5 , the depth SD is the depth from the upper surface 2 c of the cover portion 2 to the shoulder portion 4 . The depth OD is the depth from the upper surface 2c of the cover part 2 to the outer surface 1b (the discontinuous part 3c). At this point, join The part 3f is formed so that the non-joining part 3n may remain in the inner side which communicates with the internal space 3 via the discontinuous part 3c. As a result, the non-joining portion 3n remains as the inner non-joining portion 3d (see FIG. 3( b )). Furthermore, the non-joining portion 3n also remains as the outer non-joining portion 3h (see FIG. 3( b )). In addition, the width of the shoulder part 4 (upper side part 8) is not specifically limited, It may be larger than the width|variety of the front end 5a of the tool 5, and may be smaller than this width|variety. The shoulder portion 4 has a height that protrudes upward from the outer side surface 1 b but does not reach the surface 1 s of the main body portion 1 .

In a state where the tool 5 is rotated as described above and inserted to the engagement depth WD, the tool 5 is moved along the shoulder 4 (see FIG. 3( a )) in plan view. The top of the shoulder 4 and the metal material of the bottom of the bottomed groove 6 flow in a solid state by frictional heat and are agitated and integrated. Thereby, the top of the shoulder 4 and the bottom of the bottomed groove 6 are joined. As a result, the main body portion 1 and the lid portion 2 are joined. Thereby, the metal structure 10 comprised by the friction stir welding of the main-body part 1 and the cover part 2 is manufactured. In this embodiment, since the tool 5 does not reach the depth of the inner space 3 , the horizontal distance GD between the upper portion 8 (the passing position of the front end portion 5c of the tool 5 ) and the inner space 3 can be shortened. The distance GD in this embodiment is shorter than the distance GD in FIG. 1( a ).

Furthermore, the manufacturing method of the metal structure 10 may include steps other than the preparation step, the assembly step, and the bonding step. For example, the manufacturing method of the metal structure 10 may also include a step for positioning the body portion 1 and the cover portion 2 between the assembling step and the joining step. The positioning can be performed by a mechanical method such as a clamp method. The positioning can also be performed by forming a plurality of joint portions at intervals from each other by friction stir welding. The joint portion can be either a point shape or a line shape with a specific length. In addition, in the positioning step, after the plurality of point-shaped bonding portions are provided, a plurality of linear bonding portions may be provided. In addition, after the bonding step, it can also be used to Flattening treatment for the removal of burrs generated in a short period of time. Furthermore, as demonstrated using FIG. 2, the tool 5 may be inclined in the joining step.

<<Other Embodiments>>

Next, other embodiments are also described. FIG. 6( a ) is a plan view schematically showing the metal structure 10 of another embodiment, and FIGS. 6( b ) to ( e ) are cross-sectional views showing the manufacturing steps thereof, corresponding to the cross-sectional views taken along the line B-B in FIG. 6( a ). The same reference numerals are assigned to the same configurations as those included in the embodiments of FIGS. 3 to 5 .

As shown in FIG. 6( a ), in the metal structure 10 of the present embodiment, two cover parts 2 are provided for one main body part 1 . One main body part 1 and two cover parts 2 correspond to “metal members” . In this way, the metal structure may be configured to include three or more metal members. In addition, in the metal structure 10 of the present embodiment, one cover part 2 and one main body part 1 correspond to "two metal members joined by friction stir welding in a state of overlapping each other in the vertical direction", and the other cover The part 2 and one main body part 1 also correspond to "two metal members joined by friction stir welding in a state of overlapping each other in the vertical direction". In this way, the metal structure may have a plurality of combinations corresponding to "two metal members".

As shown in FIG. 6( a ), the metal structure 10 is a rectangular plate-like body extending in the longitudinal direction (the vertical direction in the drawing). The metal structure 10 has a plurality of (two) internal spaces 3 . Each of the inner spaces 3 is independent. Each inner space 3 has a shape extending in the longitudinal direction. The respective inner spaces 3 are parallel to each other.

The manufacturing method of this embodiment is demonstrated using FIG.6(a)-(e).

First, in the preparation step, as shown in FIGS. 6( a ) and ( b ), one main body portion 1 and two lid portions 2 are prepared.

The body portion 1 has two cover grooves 7 on the surface 1s of the body portion 1 . As shown in FIG. 6( a ), the cover groove 7 has a shape extending in the longitudinal direction. As shown in Fig. 6(b), the bottom surface of the cover groove 7 corresponds to the outer surface 1b. A shoulder 4 is formed on the outer surface 1b. As shown in FIGS. 6( a ) and ( b ), the shoulder portion 4 is formed along the side edge of the groove (inner space 3 ) and protrudes from the surface (outer surface 1 b ) of the cover groove 7 . The bottom surface of the groove corresponds to the first division forming surface 1d.

As shown in FIG.6(c), the two cover parts 2 have the shape which can fit in the cover groove 7 as a whole, respectively. The cover portion 2 has a bottomed groove 6 on the contact surface 2b. The contact surface 2b refers to the surface of the cover portion 2 that is in contact with the body portion 1 when the cover portion 2 is fitted into the cover groove 7 . The bottomed groove 6 has a shape capable of receiving the shoulder 4 . The bottomed groove 6 is preferably formed in such a way that a gap is created when receiving the shoulder 4 .

Next, in the assembling step, as shown in FIG. 6( d ), each cover portion 2 is placed on the body portion 1 so as to fit into the cover grooves 7 of the body portion 1 , respectively. A plurality of (two) internal spaces 3 are formed by dividing one main body portion 1 and two cover portions 2 . One inner space 3 is divided and formed for each cover part 2 . The relationship between the numbers of the main body portion 1 , the lid portion 2 and the internal space 3 is not limited to these examples, and can be appropriately set. As a result, between the main body portion 1 and the cover portion 2, the shoulder portion 4 and the bottomed groove 6 are formed to overlap the upper side portion 8 in the vertical direction X. As shown in FIG. The upper portion 8 is positioned shallower than the discontinuous portion 3c in the vertical direction X. As shown in FIG.

Next, in the joining step, as shown in FIG. 6(e), by rubbing the upper portion 8 Stir and join, and form joined part 3f. The friction stir welding reaches the upper portion 8 but does not reach the discontinuous portion 3c.

Through the above steps, the metal structure 10 having the two inner spaces 3 is manufactured.

According to this embodiment, it is possible to form a plurality of internal spaces which are independent and densely arranged in the metal structure, and it is possible to ensure a wide degree of freedom of design. Furthermore, according to the present embodiment, even when a plate-shaped body having a relatively large thickness is used as the cover portion 2, a wide degree of freedom of design can be ensured. This aspect will be described with reference to FIG. 7( a ) and FIG. 7( b ).

In FIG.7(a) and (b), the thickness OD of the cover part 2 is large. Specifically, the thickness OD is greater than the thickness T of the main body portion 1 .

FIG. 7( a ) is a cross-sectional view schematically showing the main body portion 1 and the lid portion 2 during the joining of the conventional metal structures. The depth at which the front end 5a of the tool 5 is inserted, that is, the engagement depth, is set so that the depth WD of the friction stir welding satisfies WD≧depth OD. Since the front end 5a of the tool 5 is deeply inserted, there is a possibility that the cover portion 2 is deformed greatly. In addition, in order to suppress or prevent the airtightness of the inner space 3 from deteriorating due to such deformation, it is necessary to ensure that the distance GD between the front end 5a of the tool 5 and the inner space 3 in the horizontal direction is wide.

Fig. 7(b) is a cross-sectional view schematically showing the main body part and the cover part in the joint of the embodiment. The welding depth is set so that the depth WD of friction stir welding satisfies the depth SD≦WD<depth OD. Since the front end 5a of the tool 5 is not deeply inserted, it is possible to reduce or prevent the cover portion 2 from being relatively small. Possibility of large deformation. As a result, the distance GD can be set narrower. Not only the design freedom of the interior space, but also the thickness of the metal members, a wide design freedom can be ensured.

Next, the shape of a non-joining part is demonstrated using FIG.8(a)-(d).

FIG. 8( a ) is an explanatory diagram of a method for producing a conventional metal structure. Fig. 8(b) is an explanatory diagram of a conventional metal structure. As shown in FIG. 8( a ), in the assembly 110 a , the contact surface between the body portion 101 and the cover portion 102 is flat. The front end 105 a of the tool 105 is inserted into the cover portion 102 and reaches the body portion 101 . After joining, as shown in FIG.8(b), the discontinuous part 103c, the inner non-joining part 103d, the joining part 103f, and the outer non-joining part 103h are located in the same height.

FIG. 8( c ) is an explanatory diagram of a method of manufacturing the metal structure according to the embodiment. Fig. 8(d) is an explanatory diagram of the metal structure of the embodiment. As shown in FIG. 8( c ), in the assembly 10 a , the main body portion 1 has the shoulder portion 4 . The cover portion 2 has a bottomed groove 6 for receiving the shoulder portion 4 . Therefore, the upper portion 8 of the shoulder portion 4 and the bottomed groove 6 overlapping in the vertical direction is located at a position higher than the discontinuous portion 3c in the vertical direction X. After joining, as shown in FIG. 8( d ), the inner non-joining portion 3d and the outer non-joining portion 3h have portions extending in the vertical direction. Thereby, the joining part 3f is located in the position higher than the discontinuous part 3c. As a result, the horizontal distance between the joint portion 3f and the internal space 3 in FIG. 8( d ) is shorter than the horizontal distance between the joint portion 103f and the internal space 103 in FIG. 8( b ).

FIG. 9 is a cross-sectional view schematically showing a metal structure 10 according to another embodiment. The metal structure 10 shown in FIG. 9 has a plurality of internal spaces 3 . The body portion 1 has a plurality of shoulder portions 4 . The shoulders 4 are formed so as to partition the adjacent inner spaces 3 . The cover portion 2 has a plurality of bottomed grooves 6 . Each bottomed groove 6 is formed to receive the shoulder 4 .

In the metal structure 10 shown in FIG. 9, the inner non-joining portion 3d, the joining portion 3f, and the outer non-joining portion 3h are successively connected from the discontinuous portion 3c at the upper right on the basis of the inner space 3 in the center. , the outer non-joint portion 3h communicates with the discontinuous portion 3c located at the upper left of the inner space 3 on the right side. Here, the outer non-joining portion 3h does not communicate with the inner space 3 in the center.

On the other hand, when taking the inner space 3 on the right side as a reference, from the discontinuous portion 3c at the upper left, the inner non-joining portion 3d, the joining portion 3f, and the outer non-joining portion 3h are successively connected, and the outer non-joining portion 3h It communicates with the discontinuous part 3c located at the upper right of the inner space 3 in the center. Here, the outer non-joining portion 3h does not communicate with the inner space 3 on the right side.

In this way, the outer non-joining portion 3h when viewed with one inner space 3 as a reference may correspond to the inner non-joining portion 3d when viewed with the adjacent inner space 3 as a reference.

The metal structure 10 shown in FIG. 9 is comprised so that the adjacent internal space 3 may be partitioned off by the shoulder part 4 only. Thereby, the metal structure 10 can have a plurality of inner spaces 3 arranged more densely. A higher degree of design freedom can be achieved.

FIG. 10 is a cross-sectional view schematically showing a method of manufacturing a metal structure 10 according to another embodiment. In the assembly 10a shown in FIG. 10, the upper portion 8 is located at a position higher than the discontinuous portion 3c in the vertical direction X. As shown in FIG. The upper portion 8 is the portion where the body portion 1 and the cover portion 2 overlap in the vertical direction. At the inner position of the upper portion 8, the non-joining portion 3n extends downward and passes through the discontinuous portion 3c And communicate with the inner space 3 . On the other hand, at a position outside the upper portion 8, the non-joining portion 3n extends upward and communicates with the outside of the assembly 3c. In this way, the upper portion 8 is stepped.

In the example shown in FIG. 10, friction stir welding is performed by inserting the front end 5a of the tool 5 into the upper portion 8 and the non-joining portion 3n extending upward. Therefore, in the example shown in FIG. 10, the outer non-joining part does not generate|occur|produce. As such, it is not necessarily necessary to produce the outer non-joint portion. Airtightness can be improved by performing friction stir welding on the stepped upper portion 8 . Furthermore, as shown in FIG. 10 , when there is a non-joining portion extending upward, the airtightness can be further improved by performing friction stir welding so that at least the non-joining portion remains as an outer non-joining portion.

In addition, the numerical values, materials, structures, shapes, and the like listed in the above-described embodiments and examples are merely examples, and numerical values, materials, structures, shapes, and the like different from these may be used as necessary.

1a: Metal part

2a: Metal part

3: Internal space (recess)

3a: Through hole

3b: Metal wall

3c: discontinuous part

3d: Medial non-joint

3e: (one of the inner non-joint parts) one end

3f: Joint

3g: (one of the outer non-joint parts) one end

3h: Outside non-joint part

4: shoulder

6: Bottom slot

10: Metal Structure

S: Flat

Claims (11)

A method of manufacturing a metal structure, wherein the metal structure includes two metal members, the two metal members are joined by friction stir welding in a state of overlapping each other in a vertical direction, and the two metal members are configured by the vertical direction. An assembly having an inner space between the two metal members in which directions overlap each other is formed, and the assembly has a discontinuous portion, which is formed at a position inside the assembly that is exposed to the inner space, by the above-mentioned The two metal members are in contact with or approach without being joined to each other, and the above-mentioned two metal members are discontinuous; The members are not in contact with or are close to each other, but the two metal members have a boundary with each other, and the non-joining portion is physically continuous with the discontinuous portion; the non-joining portion includes an upper portion, and the upper portion is viewed from the vertical direction. In the case of the above-mentioned assembly, based on the upper surface of the above-mentioned assembly, at a position shallower than the above-mentioned discontinuous portion, the above-mentioned two metal members are not joined to each other and are in contact or close to each other in the above-mentioned vertical direction. Each of the upper portions is formed so as to surround the inner space when the assembly is viewed from the vertical direction, and the manufacturing method includes a preparation step of preparing the two metal members, and an assembly step of making the two metal members The above-mentioned assembly is formed by overlapping in the above-mentioned vertical direction; and the joining step is to insert the tool for the above-mentioned friction stir welding from the upper surface of the above-mentioned assembly to the joint depth while rotating, and along the above-mentioned upper side portion when viewed from the above-mentioned vertical direction. The two metal members are moved together to form a joint portion for joining the two metal members, and the joint portion is formed in such a way that the non-joint portion remains at an inner position that communicates with the internal space through the discontinuous portion; the joint depth is determined by The friction stir welding has a depth that reaches the upper portion but does not reach the depth of the discontinuous portion. The manufacturing method of claim 1, wherein in the joining step, the joining portion is formed so that the non-joining portion has a portion extending in the vertical direction at the inner position. The manufacturing method of claim 1 or 2, wherein in the joining step, the joining portion is formed so that the non-joining portion remains at an outer position not communicating with the inner space in addition to the inner position. The manufacturing method of claim 1 or 2, wherein the upper portion is formed so as to surround the inner space at a position that does not overlap with the inner space when the assembly is viewed from the vertical direction, and the discontinuous portion is When the said assembly is seen from the said vertical direction, it is formed so that the said internal space may be surrounded along the outer peripheral edge of the said internal space. The manufacturing method of claim 1 or 2, wherein the two metal members are a main body portion and a cover portion, and the main body portion is at a position corresponding to the upper portion when viewed from the vertical direction and has a shoulder formed so as to protrude toward the upper surface of the assembly, the cover has a bottomed groove formed so as to receive the shoulder when the cover and the main body are overlapped, and the engaging The depth is the depth at which the friction stir welding reaches the shoulder but does not reach the discontinuity. The manufacturing method of claim 5, wherein the body portion has a cover groove on the surface for the cover portion to be fitted, and the shoulder portion is formed so as to protrude from the bottom surface of the cover groove toward the upper surface of the assembly, The cover portion is configured to have a shape that can be fitted into the cover groove, and the shoulder portion is received by the bottomed groove when the cover portion is fitted into the cover groove. The manufacturing method according to claim 1 or 2, wherein the above-mentioned metal structure system is a metal structure for heat transfer that is placed in contact with or close to an object to be heat exchanged, heated or cooled. The production method according to claim 1 or 2, wherein the metal structure system uses a hollow metal structure in a state where the inner space is a cavity. A metal structure, the metal structure having: an inner space provided inside the metal structure; A discontinuous portion, which is configured such that the two metal portions are discontinuous by contacting or approaching without being joined to each other at a position where the two metal portions constituting the metal wall portion defining the internal space are exposed to the internal space; The inner non-joining portion is configured such that the two metal portions are in contact with or approach without being joined to each other at a position inside the metal structure that is not exposed to the internal space, and the two metal portions have a boundary and are formed At the inner position that communicates with the inner space through the discontinuous portion; and the junction, which is not exposed to the inner space in the position inside the metal structure, the boundary between the two metal parts cannot be recognized or difficult to recognize One end of the above-mentioned inner non-joint portion is closed by means of identification; the above-mentioned joint portion is located in one or substantially a plane, and is formed in a manner that surrounds the above-mentioned inner space when viewed from a vertical direction perpendicular or substantially perpendicular to the above-mentioned plane, the above-mentioned The discontinuous portion is formed so as to surround the inner space when viewed from the vertical direction, and the inner non-joint portion has a portion extending in the vertical direction, so that the discontinuous portion and the joint portion are located at different positions in the vertical direction. Height; the above-mentioned metal structure further has an outer non-joining portion, and the above-mentioned outer non-joining portion is configured to be in contact with each other without being joined by the above-mentioned two metal parts at a position inside the above-mentioned metal structure that is not exposed to the above-mentioned internal space. The two metal parts are close to each other, and the two metal parts have a boundary, and are located at an outer position that does not communicate with the inner space, and one end of the outer non-joining portion is closed by the joining portion. The metal structure of claim 9, wherein The above-mentioned metal structure system is a metal structure for heat transfer which is installed so as to be in contact with or close to an object to be heat exchanged, heated or cooled. The metal structure according to claim 9, wherein the metal structure system uses a hollow metal structure in a state where the inner space is a cavity.

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