KR20210075888A - Method for manufacturing a metal structure and the metal structure - Google Patents

Abstract

The present invention relates to a method for manufacturing a metal structure, capable of securing design freedom, and to a metal structure thereof. The method for manufacturing a metal structure comprises: a preparation process where two metal members are prepared; an assembly process where they are assembled; and a bonding process where they form a joint part in which the metal members are bonded.

Description

Method for manufacturing a metal structure, and a metal structure {METHOD FOR MANUFACTURING A METAL STRUCTURE AND THE METAL STRUCTURE}

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

As a conventional metal structure, there is a metal structure having a body portion and a cover portion. A cover groove is formed in the body portion. A further concave groove is formed in the bottom surface of the cover groove of the body part. A lid portion is fitted into the lid groove. The body part and the lid part around the lid groove are joined. Thereby, the space enclosed by the recessed groove and the cover part becomes an internal space, and it becomes possible to use it as a fluid flow path. Such a metal structure can be used as a metal structure for heat transfer. The metal structure for heat transfer is disposed in contact with or close to an object to be heat exchanged, heated or cooled, for example. For example, when heat is removed from the object, the heat of the object can be removed by flowing a cooling medium through the flow path and transferring 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 cover portion in the vicinity of a cover groove by friction stir welding with respect to a metal structure.

Japanese Laid-Open Patent Publication No. 2014-240706

An object of the present invention is to provide a method for manufacturing a metal structure capable of securing a degree of design freedom while suppressing or preventing the occurrence of defects at a joint site and complexity of the manufacturing process, and a metal structure.

MEANS TO SOLVE THE PROBLEM This inventor examined about the subject mentioned above, and acquired the following knowledge.

Fig. 1 (a), (b) is a cross-sectional view which shows typically the shape of the joining of the body part 101 and the cover part 102 by friction stir welding. In addition, the cross-sectional view here means the cross-sectional view obtained by the plane orthogonal to the direction in which the internal space 103 as a fluid flow path extends.

As shown in Fig. 1 (a), the joint portion of the body portion 101 and the cover portion 102 (the passing position of the tip portion 105a of the tool 105) in the horizontal direction of the inner space 103 The distance GD is secured relatively large. As shown in Fig. 1B, if the distance GD is short, the metal base material 103a enters the inner space 103 at the time of friction stir welding, and there is a possibility that a defect may occur in the joint portion. Therefore, either of the following (i) or (ii) becomes necessary.

(i) The metal structure is designed so that the distance GD is sufficiently secured.

(ii) A joining method other than friction stir welding is employed for a site where the distance GD is difficult to secure.

When a design that sufficiently secures the distance GD is carried out as in (i) above, for example, it is difficult to densely arrange the inner space 103, and there arises a problem that the degree of freedom in design of the metal structure is limited. On the other hand, as in (ii) above, when friction stir welding and other bonding methods are combined, there is a problem that the manufacturing process becomes complicated.

Fig.2 (a), (b) is a longitudinal sectional view which shows typically the shape of the joining of the body part 101 and the cover part 102 by friction stir welding. In addition, the longitudinal cross-sectional view here refers to the cross-sectional view obtained by the plane parallel to the direction in which the internal space 103 as a fluid flow path extends. However, (a), (b) of FIG. 2 is a longitudinal cross-sectional view on the basis of the passing position of the tool 105, and therefore the internal space 103 is not shown.

In Fig. 2(a) , the lid portion 102 is fitted into a lid groove (not shown) formed in the main body portion 101 . The tool 105 of the apparatus for friction stirring (not shown) has a cylindrical shape and has the front-end|tip part 105a. The tool 105 inclines with respect to the vertical direction VD so that the front-end|tip part 105a may be located ahead in the advancing direction of the tool 105. The inclination angle D (advance angle) is, for example, more than 0 degree and preferably 5 degrees or less, and more preferably 1 degree or more and 4 degrees or less. By the way, when the tool 105 is moved in the advancing direction PD in a state where the tool 105 has an inclination angle D, in the front of the advancing direction PD, the lid portion 102 is as shown in Fig. 2(b). There are cases where deformations such as floating together occur. The easiness of such deformation and the amount of deformation increase in proportion to the size (ie, load) of the tool 105 . Therefore, when the thickness of the cover part 102 was large, there existed a problem that the cover part 102 was easy to deform|transform at the time of friction stir welding, and the tool 105 of the apparatus for friction stirring was easy to break. Therefore, it is difficult to employ the cover portion 102 having a large thickness, and the degree of freedom in design of the metal structure is limited in some cases. In addition, in the case of employing the cover portion 102 having a large thickness, if the tool 105 is enlarged in order to secure the mechanical strength of the tool 105, a larger bonding area must be secured, so that the design freedom of the metal structure is further increased. Limited. In addition, since it is necessary to take measures to prevent or suppress deformation of the cover portion 102 , there arises a problem that the manufacturing process is complicated.

MEANS TO SOLVE THE PROBLEM This inventor completed this invention based on the above knowledge. In the embodiment of the present invention, the following structures can be employed.

(1) A method for manufacturing a metal structure, comprising:

The metal structure includes two metal members joined by friction stir welding in a state superimposed on each other in a vertical direction,

The two metal members are configured to overlap each other in the vertical direction to form an assembly having an interior space between the two metal members, wherein the assembly is at a position exposed to the interior space inside the assembly, A discontinuous portion configured such that the two metal members are discontinuous by contacting or approaching the two metal members without being joined to each other, and a position in which the two metal members are not exposed to the interior space inside the assembly, wherein the two metal members are The two metal members are configured to have a boundary with each other by contacting or close to each other without being joined, and having a non-bonding portion physically continuous with the discontinuous portion, wherein the non-bonding portion is the assembly viewed in the vertical direction When the two metal members are not joined to each other at a position shallower than the discontinuous portion with respect to the upper surface of the assembly as a reference, an upper portion that is in contact with or close to each other in the vertical direction is included, Each of the portion and the upper portion is formed to surround the interior space when the assembly is viewed in the vertical direction,

The manufacturing method is

A preparation step of preparing the two metal members;

an assembly process of forming the assembly by overlapping the two metal members in the vertical direction;

Inserting the tool for friction stir bonding from the top surface of the assembly to the bonding depth while rotating, and moving along the upper portion when viewed in the vertical direction to form a bonding portion in which the two metal members are joined, the bonding portion has a bonding process formed so that the non-bonded portion remains at an inner position communicating with the internal space through the discontinuous portion,

The bonding depth is a depth at which the friction stir bonding reaches the upper portion but does not reach the depth of the discontinuous portion.

According to the manufacturing method of (1), in the joining process, the tool is inserted into the assembly so that the friction stir joining reaches to the upper part but not to the discontinuous part. The upper part is located at a position shallower than the discontinuous part. Since the formation of the abutment is performed at a shallow position, the tool is not inserted to a deep position. The load applied to the metal structure at the time of joining can be reduced, and tool enlargement for friction stir welding can be suppressed or prevented. Deformation of the metal member can be suppressed or prevented. It becomes possible to employ|adopt a metal member with a large thickness. Since the distance between the insertion position of a tool and the internal space can be ensured, generation|occurrence|production of the situation that a metal base material flows into internal space by friction stir welding can be suppressed or prevented. In addition, a joint part is formed by friction stir welding being performed with respect to the upper part where two metal members overlap in the perpendicular direction. Therefore, the occurrence of defects in the joint can be prevented.

As mentioned above, according to the manufacturing method of (1), the design freedom of a metal structure can be raised, preventing generation|occurrence|production of a defect. Moreover, according to the manufacturing method of (1), since joining in a shallow position is attained, it is easy to employ|adopt friction stir welding. It is not necessary to combine friction stir welding and other joining methods, and a structure that can be joined only by friction stir welding can be adopted. However, the joining of two metallic members in the metallic structure of (1) is not necessarily limited only to friction stir joining. In addition to friction stir welding, a bonding method other than friction stir welding may also be used. By adopting the manufacturing method of (1), the degree of freedom in design is improved, a structure in which two metal members can be easily joined can be adopted, and the disadvantages caused by the combination of the joining methods can be reduced.

(2) The manufacturing method of (1),

In the bonding step, the bonding portion is formed so that the unbonded 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 a portion extending in the vertical direction at the inner position, the distance between the discontinuous portion and the joined portion can be secured in the vertical direction. Accordingly, for example, even if the distance in the horizontal direction between the discontinuous portion and the joint portion is not sufficiently secured, the distance between the discontinuous portion and the joint portion can be secured. As a result, for example, the inner space can be arranged more densely. The degree of freedom in design can be improved while suppressing the occurrence of defects and suppressing or preventing the complexity of the manufacturing process.

(3) The method for producing (1) or (2),

In the bonding step, the bonding portion is formed so that the unbonded portion remains at an outside position not communicating with the interior space in addition to the inside position.

According to the manufacturing method of (3), a junction part is formed so that an unbonded part may remain|survive on both sides of a junction part (namely, both an inner position and an outer position). Generation of voids in the junction can be suppressed or prevented. As a result, it becomes possible to avoid the complication of the manufacturing process while preventing the occurrence of defects in the metal structure, particularly defects in the internal space, and to improve the design freedom of the metal structure.

And, since a junction exists between the outer non-joint part (non-joint part remaining in an outer position) and the said internal space, the outer non-joined part does not communicate with the said internal space. However, when the metal structure body has another internal space, the outer non-joint portion may communicate with the other internal space. The outer non-joint portion corresponds to the inner non-joint portion when viewed from the other internal space as a reference. Further, the outer non-joint portion may communicate with the outside of the metal structure.

(4) The production method according to any one of (1) to (3),

The upper portion is formed to surround the inner space in a position that does not overlap the inner space when the assembly is viewed in the vertical direction,

The discontinuous portion is formed to surround the inner space along an outer peripheral edge of the inner space when the assembly is viewed in the vertical direction.

According to the manufacturing method of (4), it becomes possible to avoid the complexity of a manufacturing process, and to improve the design freedom of a metal structure, while preventing generation|occurrence|production of the defect of a metal structure, especially the defect of an internal space.

(5) The production method according to any one of (1) to (4),

The two metal members are a body part and a cover part,

The body portion has a shoulder portion formed to protrude toward the upper surface of the assembly in a position corresponding to the upper portion when viewed in the vertical direction,

The cover portion has a bottomed groove formed to receive the shoulder portion when the cover portion is overlapped with the body portion,

The bonding depth is a depth at which the friction stir bonding reaches the shoulder but does not reach the depth of the discontinuous portion.

According to the manufacturing method of (5), it becomes possible to avoid the complication of a manufacturing process, and to improve the design freedom of a metal structure, while preventing generation|occurrence|production of the defect of a metal structure, especially the defect of an internal space.

(6) The manufacturing method of (5),

The body portion has a cover groove on the surface into which the cover portion is fitted, and the shoulder portion is formed to protrude from the bottom surface of the cover groove toward the upper surface of the assembly,

The lid portion has a shape capable of being fitted into the lid groove, and is configured such that the shoulder portion is received into the bottomed groove when the lid portion is fitted into the lid groove.

According to the manufacturing method of (6), it becomes possible to avoid the complication of a manufacturing process, and to improve the design freedom of a metal structure, while preventing generation|occurrence|production of the defect of a metal structure, especially the defect of an internal space.

(7) The production method according to any one of (1) to (6),

The metal structure is a metal structure for heat transfer installed in contact with or close to an object to be heat exchanged, heated or cooled.

According to the manufacturing method of said (7), the design freedom of a metal structure, especially the design freedom of an internal space can be improved while preventing generation|occurrence|production of a defect. By using the internal space as a fluid flow path, for example, it is possible to realize a metal structure in which flow paths excellent in fluid sealing properties are densely arranged. That is, a metal structure having excellent heat transfer properties can be realized with high sealing properties and design freedom. That is, according to the manufacturing method of (7), the metal structure suitable for an object for heat transfer can be manufactured.

(8) The metal structure according to any one of (1) to (6),

The said metal structure is a hollow metal structure used in the state in which the said internal space is hollow.

According to the manufacturing method of said (8), the design freedom of a metal structure, especially the design freedom of an internal space can be improved while preventing generation|occurrence|production of a defect. By making the inner space hollow, it is possible to realize, for example, a metal structure in which the cavities are densely arranged. That is, it is possible to realize a hollow metal structure having a high degree of freedom in design with respect to a combination of mechanical strength, weight, and size of the structure.

(9) a metal structure, comprising:

The metal structure,

an internal space formed inside the metal structure;

A discontinuous portion configured to be discontinuous by contacting or close to each other without being joined to each other at a position where the two metal parts constituting the metal wall part dividing the interior space are exposed to the interior space; ,

In a position that is not exposed to the internal space inside the metal structure, the two metal parts are configured to have a boundary by contacting or close to each other without being bonded to each other, so that the two metal parts have a boundary through the discontinuous part. An inner non-joint portion formed at an inner position communicating with the space;

In a position that is not exposed to the internal space inside the metal structure, it has a junction part that closes one end of the inner non-junction part so that the boundary between the two metal parts is indistinguishable or difficult to identify,

The joint portion is located in one or substantially one plane and is formed to surround the interior space when viewed in a vertical direction perpendicular or substantially perpendicular to the plane,

The discontinuous portion is formed to surround the inner space when viewed in the vertical direction,

The inner non-joint portion has a portion extending in the vertical direction so that the discontinuous portion and the joined portion are located at different heights in the vertical direction.

According to the metal structure of (9), it is possible to avoid the complication of the manufacturing process while preventing the occurrence of defects in the metal structure, particularly defects in the internal space, and improve the degree of freedom in design of the metal structure.

(10) The metal structure of (9), comprising:

The metal structure, further,

In a position not exposed to the internal space inside the metal structure, the two metal parts are configured to have a boundary by contacting or close to each other without being bonded to each other, and not communicating with the internal space It has an outer non-joint portion located at an outer position and closed at one end by the joint portion.

The metal structure of (10) is manufactured so that the inner non-junction part and the outer non-junction part are located on both sides of the joint part. Generation of voids in the joint portion during manufacturing can be suppressed or prevented.

(11) The metal structure of (9) or (10),

The metal structure is a metal structure for heat transfer installed in contact with or close to an object to be heat exchanged, heated or cooled.

According to the metal structure of (11) above, while preventing the occurrence of defects, it is possible to improve the design freedom of the metal structure, in particular, the design freedom of the interior space. By using the internal space as a fluid flow path, for example, it is possible to realize a metal structure in which flow paths excellent in fluid sealing properties are densely arranged. That is, a metal structure having excellent heat transfer properties can be realized with high sealing properties and design freedom. That is, the metal structure of (11) is suitable for heat transfer.

(12) The metal structure of (9) or (10),

The metal structure is a hollow metal structure used in a state in which the inner space is hollow.

According to the manufacturing method of (12) above, it is possible to improve the design freedom of the metal structure, particularly the design freedom of the internal space, while preventing the occurrence of defects. By making the inner space hollow, it is possible to realize, for example, a metal structure in which the cavities are densely arranged. That is, it is possible to realize a hollow metal structure having a high degree of freedom in design with respect to a combination of mechanical strength, weight, and size of the structure.

ADVANTAGE OF THE INVENTION According to this invention, design freedom can be ensured, suppressing or preventing generation|occurrence|production of a defect in a joining site|part and complexity of a manufacturing process.

1(a), (b) is sectional drawing which shows typically the mode of joining of the main body part and cover part by friction stir welding.
Fig. 2 (a) and Fig. 2 (b) are cross-sectional views schematically showing the state of bonding between the body portion and the lid portion 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 line AA of Fig. 3 (a).
[ Fig. 4 ] Figs. 4 (a) to (c) are cross-sectional views showing a manufacturing process of the metal structure according to the embodiment.
It is sectional drawing which shows typically the main-body part and the cover part during bonding.
Fig. 6 (a) is a plan view schematically showing a metal structure according to another embodiment, and Figs. 6 (b) to (e) are cross-sectional views showing the manufacturing process thereof. It corresponds to the cross-sectional view taken along line BB of (a).
Fig. 7 (a) is a cross-sectional view schematically showing a body portion and a cover portion during bonding according to a conventional metal structure, and Fig. 7 (b) is a body portion and a cover portion during bonding according to the embodiment. It is a cross-sectional view schematically showing wealth.
Fig. 8 (a) and Fig. 8 (b) are cross-sectional views schematically showing a conventional metal structure, and Fig. 8 (c) and Fig. 8 (d) are related to the embodiment. It is sectional drawing which shows typically a metal structure.
9 is a cross-sectional view schematically showing a metal structure according to another embodiment.
It is sectional drawing which shows typically the manufacturing method of the metal structure which concerns on another embodiment.

<<Metal structure according to one embodiment>>

First, the metal structure 10 which concerns on one Embodiment is demonstrated. FIG. 3A is a plan view schematically showing the metal structure 10 . Fig. 3(b) is a cross-sectional view taken along line A-A of Fig. 3(a).

The metal structure 10 has an inner space 3 , a discontinuous portion 3c , an inner non-joint portion 3d , a bonded portion 3f , and an outer non-joint portion 3h .

The metal structure 10 is a plate-shaped body. The metal structure 10 has a rectangular shape extending in the longitudinal direction (up-down direction in Fig. 3(a)) in a plan view, as shown in Fig. 3A. The metal structure 10 has a rectangular shape when viewed in cross section, as shown in FIG. 3B . The metal structure 10 is configured to include a metal portion 1a and a metal portion 2a. The metal part 1a and the metal part 2a are joined to each other in the junction part 3f. The metal structure 10 is made of copper. That is, the metal part 1a and the metal part 2a are made of copper. The metal constituting the metal structure 10 is not particularly limited. As said metal, copper, aluminum, or the alloy containing at least 1 sort(s) of these is mentioned, for example. In addition, the metal part 1a and the metal part 2a may be comprised with the mutually same metal, and may be comprised with different metals.

The inner space 3 is formed inside the metal structure 10 . The inner space 3 has a shape extending in the longitudinal direction (up-and-down direction in FIG. 3A ) in a plan view. The shape of the inner space is not particularly limited. The inner space may have a U-shape or a zigzag shape. The number of internal spaces in one metal structure is not specifically limited, It is one or more. The interior space 3 is partitioned by a metal wall portion 3b. The metal wall portion 3b is constituted by a portion of the metal structure 10 exposed to the internal space 3 . The metal wall part 3b consists of a part comprised by the metal part 1a, and the part comprised by the metal part 2a. The metal part 1a corresponds to the body part 1 mentioned later. The metal part 2a corresponds to the cover part 2 mentioned later. The metal part 1a and the metal part 2a are integrated by joining in the junction part 3f.

The discontinuous portion 3c is formed in a position where the metal portion 1a and the metal portion 2a are exposed to the interior space 3 by contacting or close to each other without being joined to each other, thereby forming the metal portion 1a and the metal portion ( 2a) is a part configured to be discontinuous. The discontinuous portion 3c is formed to surround the inner space 3 when viewed in the vertical direction X. As shown in FIG.

The inner non-bonding portion 3d is at a position not exposed to the internal space 3 of the metal structure 10, so that the metal part 1a and the metal part 2a are not joined to each other and come into contact with or close to each other, so that the metal part ( 1a) and the metal portion 2a are portions configured to have a boundary, and are formed at an inner position communicating with the interior space 3 through the discontinuous portion 3c. That is, one end 3e of the inner non-joint portion 3d is closed by the joined portion 3f, and the discontinuous portion 3c corresponds to the other end of the inner non-joint portion 3d. The inner non-joint portion 3d has a portion extending in the vertical direction X such that the discontinuous portion 3c and the bonded portion 3f are located at different heights in the vertical direction X. As shown in FIG. The inner non-bonded portion 3d is located at an inner position of the abutted portion 3f. In addition, the inner position of the junction part 3f exists in the position relatively close to the internal space 3, and points out the position which communicates with the internal space 3 via the discontinuous part 3c. On the other hand, the outer position of the junction part 3f is a position relatively far from the inner space 3, and points out the position which does not communicate with the inner space 3 .

The joint portion 3f is at a position not exposed to the internal space 3 of the metal structure 10, so that the boundary between the metal portion 1a and the metal portion 2a is indistinguishable or difficult to identify. ) that closes the one end (3e). And, it is not necessary to strictly distinguish whether the boundary is indistinguishable or difficult to identify. In and out of the fluid may be blocked between the inner position and the outer position of the junction part 3f. The junction part 3f is located in one plane S. The plane S is an imaginary plane. The vertical direction X indicates a direction perpendicular or substantially perpendicular to the plane S. That is, the joint portions 3f are located at the same or substantially the same height (depth) in the vertical direction X. As shown in FIG. The plane S may have a width in the vertical direction X. The plane S including the junction part 3f is contained in the metal part 2a. In other words, the junction part 3f is formed in the metal part 2a. Further, the joint portion 3f is formed so as to surround the internal space 3 as shown in Fig. 3(a) when viewed in the vertical direction X. As shown in Figs.

The outer non-bonded portion 3h is formed in a position not exposed to the internal space 3 of the metal structure 10, so that the metal part 1a and the metal part 2a are not joined to each other and come into contact with or close to each other, so that the metal part ( 1a) and the metal part 2a are a part configured to have a boundary, located in an outer position, and the end 3g is closed by the junction part 3f. The other end of the outer non-joint portion 3h may communicate 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-joint portion 3h may communicate with the other internal space 3 . Incidentally, depending on the structure of the metal structure, there are cases where the outer non-joint portion does not exist at the outer position.

The internal space 3 communicates with the outside of the metal structure 10 through a through hole 3a formed in the metal part 2a. As shown in Fig. 3(a), two through holes 3a are formed in the metal part 2a. The through hole 3a is used, for example, as an inlet or outlet for a fluid such as a refrigerant. In addition, the number of the through-holes 3a is not specifically limited. The number of the through-holes 3a may be one, and the number may be sufficient as multiple pieces. Although the through hole 3a is formed only in the metal part 2a, it may be formed only in the metal part 1a, and may be formed in both the metal part 1a and the metal part 2a.

The through hole 3a is formed in the metal part 2a. As described above, the joint portion 3f is also formed in the metal portion 2a. In this way, it is preferable that the through hole 3a and the joint portion 3f are formed in one metal part 2a and not in the other metal part 1a. Thereby, the flow of the external fluid of the internal space 3 and the metal structure 10 through the metal part 1a is prevented. For example, when a fluid such as a refrigerant flows through the internal space 3 , leakage of the fluid from the metal part 1a is prevented. Therefore, the metal part 1a can be suitably used as a heat transfer surface in contact with or close to an object to be heat exchanged, heated or cooled. In this embodiment, although the metal part 1a has a heat transfer surface, the metal part 2a may have a heat transfer surface. In addition, as shown to Fig.3 (a), in the internal space 3, the junction part 3f is formed over the whole periphery of the outer periphery of the internal space 3, and the through-hole 3a is Except for, it is preferable to be sealed. In addition, the through hole 3a is not essential.

The use of the metal structure 10 is not particularly limited. The metal structure 10 may be, for example, a hollow metal structure used in a state in which the internal space 3 is hollow. Further, the metal structure 10 may be a heat transfer metal structure provided in contact with or close to an object to be heat exchanged, heated or cooled. The metal structure 10 has an internal space 3 having excellent sealing properties. That is, the body part 1 and the cover part 2 joined to each other in the junction part 3f can block the entry and exit of the fluid between the internal space 3 and the outside of the metal structure 10 . The metal structure 10 can be suitably used so that the internal space 3 functions as a flow path or storage part of a fluid. The fluid is, for example, a gas or a liquid. When the metal structure 10 is used as a metal structure for heat transfer, the fluid is a fluid for heat transfer, such as a refrigerant|coolant, for example.

<<The manufacturing method of the metal structure which concerns on one Embodiment>>

Next, the manufacturing method of the metal structure 10 which concerns on one Embodiment is demonstrated with reference to FIGS. 4(a) - (c) and FIG. 5. FIG.

<Preparation process>

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

The main body 1 is made of a metal material. The metal material is not particularly limited as long as it is a metal material capable of plastic flow by softening with the friction heat of friction stirring. As said metal material, copper, aluminum, or the alloy containing at least 1 sort(s) of these is mentioned, for example. The body part 1 is a plate-shaped body. The body part 1 is an elongate plate-shaped body. The shape of the body part 1 is not limited to a plate-shaped body.

The body part 1 has a 1st partition surface 1d for partitioning the internal space 3, as shown to Fig.4 (a). In this embodiment, the internal space 3 corresponds to the space in the groove|channel formed in the main-body part 1 . The first partition surface 1d corresponds to the surface of the groove formed in the body portion 1 . The internal space 3 is partitioned by the 1st partition surface 1d of the main body part 1, and the 2nd partition surface 2d of the cover part 2 shown in FIG.4(b). The shoulder part 4 is formed in the outer side of the 1st partition surface 1d, as shown to Fig.4 (a).

The cover portion 2 is made of a metal material. The metal material is not particularly limited as long as it is a material capable of plastic flow by softening with the friction heat of friction stirring. As this metal material, copper, aluminum, or the alloy containing at least 1 sort(s) of these is mentioned, for example. The material of the cover part 2 may be the same as or substantially the same as the material of the body part 1, and may be different from the material of the body part 1.

As shown in FIG. 4(b), the cover part 2 has the 2nd partition surface 2d which partitions the internal space 3 together with the 1st partition surface 1d. As shown in FIG. 4(d), the lid part 2 has a contact surface 2b that abuts against the outer surface 1b of the body part 1 when the lid part 2 is mounted on the body part 1 . have The contact surface 2b is formed with a bottomed groove 6 for receiving the shoulder 4 . The bottomed groove 6 is a bottomed groove. The cross-sectional shape of the bottomed groove 6 is rectangular. And in this embodiment, the 1st partition surface 1d constitutes a recessed part, and the 2nd partition surface 2d is a flat surface. However, the 1st partition surface 1d may be a flat surface, and the 2nd partition surface 2d may form a recessed part. Moreover, both of the 1st partition surface 1d and the 2nd partition surface 2d may have a recessed part.

<Assembly process>

In the assembling process, as shown in FIG. 4(c), the lid part 2 is moved so that the shoulder part 4 of the main body part 1 is received in the bottomed groove 6 of the lid part 2 . It is mounted on the main body (1). Thereby, the assembly 10a having the inner space 3 is formed. In the assembly 10a, in the vertical direction, the body portion 1 is located below, and the lid portion 2 is located above. The assembly 10a has a discontinuous portion 3c and an unbonded portion 3n. The discontinuous portion 3c is at a position exposed to the internal space 3 of the assembly 10a, so that the body portion 1 and the cover portion 2 are in contact with or close to each other without being joined to each other. And the cover part 2 is a part configured to have a boundary with each other. The non-bonded portion 3n is at a position not exposed to the inner space of the assembly 10, so that the body portion 1 and the cover portion 2 are in contact with or close to each other without being bonded to each other. The cover part 2 is configured to have boundaries with each other. The non-joint portion 3n is a boundary between the body portion 1 and the lid portion 2 . The non-joint part 3n is in physical communication with the non-continuous part 3c which is the boundary of the body part 1 and the lid part 2 similarly. In the assembly 10a , the unbonded portion 3n comprises an upper portion 8 . The upper portion 8 is at a position shallower than the discontinuous portion 3c with respect to the upper surface 2c of the assembly 10a when viewed in the vertical direction X of the assembly 10a, the body portion 1 and the cover part 2 are not joined to each other and are in contact with or close to each other in the vertical direction X. The upper part 8 is a part where the shoulder part 4 and the bottomed groove 6 overlap each other in the vertical direction X. As shown in FIG. The discontinuous portion 3c and the upper portion 8 are formed to surround the inner space 3 when the assembly 10a is viewed in the vertical direction X (see FIG. 3A ).

<Joining process>

The bonding process is performed with respect to the assembly 10a, as shown in FIG. In the joining process, the body part 1 and the cover part 2 are joined by friction stir welding. The tool 5 of the apparatus for friction stirring (not shown) is used in this joining process. The tool 5 is formed of a material having high heat resistance and abrasion resistance. The tool 5 is a cylindrical body which has the tapered-end|tip part 5a at the front-end|tip. The tool 5 is controlled by a drive device provided in the device for friction stirring so as to move while rotating. Specifically, while the tool 5 rotates, it is possible to perform a relative lifting and lowering movement with respect to the body portion 1 and the cover portion 2 and a relative parallel movement with respect to the body portion 1 and the cover portion 2 . . The lifting movement is movement in the vertical direction X. A parallel movement is a movement in a direction perpendicular to the vertical direction X. A spiral thread groove (not shown) is formed on the outer peripheral surface of the tip portion 5a of the tool 5 .

In a bonding process, rotating the tool 5, it inserts from the upper surface 2c of the assembly 10a to the bonding depth in the cover part 2 . The upper surface 2c of the assembly 10a corresponds to the surface on the opposite side to the contact surface 2b in the lid part 2 . 5 : has shown the state inserted to the joining depth, rotating the tool 5. As shown in FIG. The bonding depth is the depth at which the depth WD of the friction stir bonding reaches the shoulder 4 received in the bottomed groove 6 but does not reach the outer surface 1b (the discontinuous portion 3c). In other words, the bonding depth is set such that the depth WD of the friction stir welding satisfies the depth SD≤WD<depth OD. And as shown in FIG. 5, the depth SD is the depth from the upper surface 2c of the cover part 2 to the shoulder part 4. As shown in FIG. The depth OD is the depth from the upper surface 2c of the lid part 2 to the outer surface 1b (the discontinuous part 3c). At this time, the junction part 3f is formed so that the non-junction part 3n may remain in the inside position which communicates with the internal space 3 via the discontinuity part 3c. As a result, the unbonded portion 3n remains as the inner unbonded portion 3d (see Fig. 3(b)). In addition, the non-joint part 3n remains also as the outer non-joint part 3h (refer FIG.3(b)). In addition, the width|variety of the shoulder part 4 (upper part 8) is not specifically limited, More than the width|variety of the front-end|tip 5a of the tool 5 may be sufficient, and the said width|variety or less may be sufficient. The shoulder portion 4 protrudes upward from the outer surface 1b, but has a height that does not reach the surface 1s of the body portion 1 .

In the state that the tool 5 is rotated and inserted up to the bonding depth WD, the tool 5 is moved so as to follow the shoulder 4 (refer to Fig. 3(a)) in a plan view. The top part of the shoulder part 4 and the metal material of the bottom part of the bottomed groove 6 are agitated and integrated while fluidizing in a solid state by frictional heat. Thereby, the top part of the shoulder part 4 and the bottom part of the bottomed groove|channel 6 are joined. As a result, the body part 1 and the lid part 2 are joined. Thereby, the metal structure 10 comprised by the body part 1 and the cover part 2 being friction stir-joined is manufactured. In this embodiment, since the tool 5 does not reach the depth of the internal space 3, the horizontal direction of the upper part 8 (passing position of the tip part 5c of the tool 5) and the internal space 3 It is possible to shorten the distance GD from The distance GD in this embodiment is shorter than the distance GD in Fig.1 (a).

In addition, the manufacturing method of the metal structure 10 may have processes other than a preparatory process, an assembly process, and a bonding process. For example, the manufacturing method of the metal structure 10 may have the process for positioning the body part 1 and the cover part 2 between an assembly process and a joining process. Positioning may be performed by mechanical means, such as a clamping means. Positioning may be performed by forming a plurality of junctions by friction stir welding at intervals from each other. The junction may be in the form of a point or may be linear having a predetermined length. In addition, in a positioning process, after a some point-like junction part is formed, a some linear junction part may be formed. Further, after the bonding step, a flattening treatment for removing burrs generated by the bonding step may be performed. In addition, as demonstrated using FIG. 2, you may incline the tool 5 in a bonding process.

<<Other embodiment >>

Next, another embodiment is also described. Fig. 6(a) is a plan view schematically showing a metal structure 10 according to another embodiment, and Figs. 6(b) to (e) are cross-sectional views showing the manufacturing process thereof, and Fig. 6( It corresponds to the cross-sectional view of line BB in a). The same code|symbol is attached|subjected about the structure similar to the structure included in embodiment of FIG. 3-5.

As shown to Fig.6 (a), in the metal structure 10 which concerns on this embodiment, with respect to one main-body part 1, the two cover parts 2 are formed. One main body part 1 and two lid parts 2 correspond to a "metal member." In this way, the metal structure may be configured to include three or more metal members. Moreover, in the metal structure 10 which concerns on this embodiment, one cover part 2 and one main body part 1 are "two metal joined by friction stir welding in a state superimposed on each other in the vertical direction. member", and the other cover part 2 and one main body part 1 also correspond to "two metal members joined by friction stir welding in a state superimposed on 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 to Fig.6 (a), the metal structure 10 is a rectangular plate-shaped body extending in the longitudinal direction (up-and-down direction in the figure). The metal structure 10 has a plurality (two) of internal spaces 3 . Each inner space 3 is independent from each other. Each inner space 3 has a shape extending in the longitudinal direction. Each interior space 3 is parallel to each other.

The manufacturing method of the said embodiment is demonstrated using Fig.6 (a) - (e).

First, in a preparatory process, as shown to Fig.6 (a) and (b), one main-body part 1 and two lid|cover parts 2 are prepared.

The body part 1 has two cover grooves 7 on the surface 1s of the body part 1 . The cover groove 7 has a shape extending in the longitudinal direction, as shown in FIG. 6A . The bottom surface of the cover groove 7 corresponds to the outer surface 1b, as shown in Fig. 6B. A shoulder 4 is formed on the outer surface 1b. As shown in Figs. 6(a) and 6(b), the shoulder portion 4 follows the side edge of the concave groove (internal space 3) and also the surface of the cover groove 7 (outer surface 1b)). It is formed to protrude from the The bottom surface of the concave groove corresponds to the first partition surface 1d.

Each of the two lid portions 2 has a shape capable of being fitted into the lid groove 7 as a whole, as shown in FIG. 6(c) . The lid portion 2 has a bottomed groove 6 on the contact surface 2b. The contact surface 2b refers to the surface of the lid portion 2 that comes into contact with the body portion 1 when the lid portion 2 is fitted into the lid groove 7 . The bottomed groove 6 has a shape capable of receiving the shoulder 4 . It is preferable that the bottomed groove|channel 6 is formed so that a gap may not arise when the shoulder part 4 is taken in.

Next, in the assembly process, as shown in FIG.6(d), each lid part 2 is mounted on the main body part 1 so that it may fit in the lid groove|channel 7 of the main body part 1, respectively. A plurality (two) of internal spaces 3 are partitioned by one body portion 1 and two lid portions 2 . One inner space 3 is partitioned for each cover part 2 . The numerical relationship of the body portion 1, the lid portion 2, and the inner space 3 is not limited to these examples, and may be appropriately set. As a result, between the body part 1 and the lid part 2, the upper part 8 where the shoulder part 4 and the bottomed groove|channel 6 overlap in the vertical direction X arises. The upper part 8 exists at a position shallower than the non-continuous part 3c in the vertical direction X. As shown in FIG.

Next, in a joining process, as shown to Fig.6 (e), when friction stir welding is performed with respect to the upper part 8, the joining part 3f is formed. The friction stir welding reaches up to the upper part 8 but not to the discontinuous part 3c.

Through the above process, the metal structure 10 having two internal spaces 3 is manufactured.

According to the present embodiment, it is possible to form a plurality of internal spaces which are independent of each other and which are densely arranged in the metal structure, and it is possible to secure a wide degree of freedom in design. Moreover, according to this embodiment, also when a plate-shaped object with a large thickness is employ|adopted as the cover part 2, the design freedom can be ensured widely. This point is demonstrated with reference to FIG.7(a) and FIG.7(b).

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

Fig. 7(a) is a cross-sectional view schematically showing the body portion 1 and the lid portion 2 during bonding according to a conventional metal structure. The depth into which the tip 5a of the tool 5 is inserted, ie, the bonding depth, is set so that the depth WD of the friction stir welding satisfies WD≧depth OD. Since the tip 5a of the tool 5 is deeply inserted, there is a possibility that a large deformation may occur in the cover portion 2 . In addition, in order to suppress or prevent deterioration of the airtightness of the internal space 3 due to such deformation, the distance GD between the tip 5a of the tool 5 and the internal space 3 in the horizontal direction needs to be secured widely there is

Fig. 7(b) is a cross-sectional view schematically showing a body portion and a lid portion during bonding according to the embodiment. The bonding depth is set so that the depth WD of the friction stir welding satisfies the depth SD≤WD<depth OD. Since the tip 5a of the tool 5 is not deeply inserted, the risk of large deformation in the cover part 2 can be reduced or prevented. As a result, the distance GD can be set narrowly. In addition to the degree of freedom in designing the interior space, a wide degree of freedom in design can be secured also with respect to the thickness of the metal member.

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

Fig. 8(a) is an explanatory diagram of a conventional method for manufacturing a metal structure. Fig. 8B is an explanatory diagram of a conventional metal structure. As shown in Fig. 8(a) , in the assembly 110a, the contact surface between the body portion 101 and the cover portion 102 is flat. The tip 105a of the tool 105 is inserted into the lid portion 102 and reaches the body portion 101 . After bonding, as shown in Fig. 8B, the non-continuous portion 103c, the inner non-bonding portion 103d, the bonding portion 103f, and the outer non-joining portion 103h are located at the same height.

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

9 : is sectional drawing which shows typically the metal structure 10 which concerns on another embodiment. The metal structure 10 shown in FIG. 9 has several internal spaces 3 . The body portion 1 has a plurality of shoulder portions 4 . The shoulder part 4 is comprised so that the adjacent internal space 3 may be pinched|interposed. The lid part 2 has a plurality of bottomed grooves 6 . Each bottomed groove 6 is configured to receive the shoulder 4 .

In the metal structure 10 shown in Fig. 9, with reference to the central internal space 3, the inner non-joint portion 3d, the jointed portion 3f, and the outer side are sequentially from the upper right discontinuous portion 3c. The non-joint part 3h is connected, and the outer non-joint part 3h communicates with the non-continuous part 3c located in the upper left side of the inner space 3 on the right side. Here, the outer non-joint portion 3h does not communicate with the central inner space 3 .

On the other hand, in the case of the internal space 3 on the right side as a reference, the inner non-junction part 3d, the junction part 3f, and the outer non-junction part 3h are connected in order from the non-continuous part 3c of the upper left side, and the outer non-joint portion 3h communicates with the non-continuous portion 3c located at the upper right of the central inner space 3 . Here, the outer non-joint portion 3h does not communicate with the inner space 3 on the right side.

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

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

10 : is sectional drawing which shows typically the manufacturing method of the metal structure 10 which concerns on another embodiment. In the granular body 10a shown in FIG. 10, the upper part 8 is located in the position higher than the non-continuous part 3c in the vertical direction X. As shown in FIG. The upper part 8 is a part where the body part 1 and the cover part 2 overlap in a vertical direction. In the inner position of the upper portion 8 , the unbonded portion 3n extends downward and communicates with the interior space 3 via the discontinuous portion 3c. On the other hand, in the outer position of the upper portion 8, the unjoined portion 3n extends upward and communicates with the outside of the assembly 3c. In this way, the upper part 8 forms a step.

In the example shown in FIG. 10, friction stir welding is performed by inserting the front-end|tip 5a of the tool 5 with respect to the unjoined part 3n extending upward together with the upper part 8. As shown in FIG. Therefore, in the example shown in FIG. 10, an outer non-joint portion is not created. As such, the outer non-joint portion does not necessarily have to be created. Airtightness can be improved by performing friction stir welding with respect to the upper part 8 which forms a stage. Moreover, as shown in FIG. 10, when there exists a non-joint part extending upward, airtightness can be improved more by performing friction stir welding so that at least the said non-joint part may remain as an outer non-joint part.

In addition, the numerical values, materials, structures, shapes, etc. exemplified in the above-described embodiments and examples are not merely examples, and if necessary, other numerical values, materials, structures, shapes, etc. may be used.

1: body part
1a: metal part
1b: outer surface
1d: first compartment
2: cover part
2a: metal part
2b: contact surface
2c: upper surface
2d: second compartment
3: Internal space (concave part)
3a: through hole
3b: metal wall
3c: discontinuous
3d: inner non-joint part
3e: one end (inner non-joint part)
3f: junction
3g: (outer non-joint part) one end
3h: Outer non-joint part
3n: unjoined part
4: shoulder
5: Tool
5a: tip
6: Groove with floor
7: cover groove
10: metal structure
10a: assembly

Claims (12)

The metal structure includes two metal members joined by friction stir welding in a state superimposed on each other in a vertical direction,
The two metal members are configured to overlap each other in the vertical direction to form an assembly having an interior space between the two metal members, wherein the assembly is exposed to the interior space inside the assembly. , a discontinuous portion configured such that the two metal members are discontinuous by contacting or close to each other without being bonded to each other, and a position in which the two metal members are not exposed to the interior space inside the assembly. is configured so that the two metal members have a boundary with each other by contacting or close to each other without being joined, and having a non-bonding portion physically continuous with the discontinuous portion, wherein the non-bonding portion moves the assembly in the vertical direction When viewed, with respect to the upper surface of the assembly, at a position shallower than the discontinuous portion, the two metal members are not joined to each other and include an upper portion that is in contact with or close to each other in the vertical direction, wherein the ratio Each of the continuous portion and the upper portion is formed to surround the interior space when the assembly is viewed in the vertical direction,
a preparation step of preparing the two metal members;
an assembly process of forming the assembly by overlapping the two metal members in the vertical direction; and
Inserting the tool for friction stir bonding from the top surface of the assembly to the bonding depth while rotating, and moving along the upper portion when viewed in the vertical direction to form a bonding portion in which the two metal members are joined, the bonding portion is a bonding step in which the unbonded portion is formed so as to remain at an inner position communicating with the internal space through the discontinuous portion;
including,
wherein the bonding depth is a depth at which the friction stir bonding reaches the upper portion but does not reach the depth of the discontinuous portion,
A method for manufacturing a metal structure. According to claim 1,
In the bonding step, the bonding portion is formed so that the unbonded portion has a portion extending in the vertical direction in the inner position. 3. The method of claim 1 or 2,
In the joining step, the joined portion is formed so that the unjoined portion remains in an outer position not communicating with the inner space in addition to the inner position. 4. The method according to any one of claims 1 to 3,
The upper portion is formed to surround the inner space in a position that does not overlap the inner space when the assembly is viewed in the vertical direction,
The discontinuous portion, when the assembly is viewed in the vertical direction, is formed to surround the inner space along the outer peripheral edge of the inner space, the manufacturing method of the metal structure. 5. The method according to any one of claims 1 to 4,
The two metal members are a body part and a cover part,
The body portion has a shoulder portion formed to protrude toward the upper surface of the assembly in a position corresponding to the upper portion when viewed in the vertical direction,
The cover portion has a bottomed groove formed to receive the shoulder portion when the cover portion is overlapped with the body portion,
The bonding depth is a depth at which the friction stir bonding reaches the shoulder but does not reach the depth of the discontinuous portion. 6. The method of claim 5,
The body portion has a cover groove on the surface for fitting the cover portion, and the shoulder portion is formed to protrude from the bottom surface of the cover groove toward the upper surface of the assembly,
The cover portion has a shape capable of being fitted into the cover groove, and is configured such that the shoulder portion is received into the bottomed groove when the cover portion is fitted into the cover groove. 7. The method according to any one of claims 1 to 6,
The metal structure is a metal structure for heat transfer that is installed in contact with or close to an object to be heat exchanged, heated or cooled, a method of manufacturing a metal structure. 8. The method according to any one of claims 1 to 7,
The method for manufacturing a metal structure, wherein the metal structure is a hollow metal structure used in a state in which the internal space is hollow. metal structure,
an internal space formed inside the metal structure;
a discontinuous portion configured to be discontinuous by contacting or close to each other without being joined to each other at a position where two metal portions constituting the metal wall portion dividing the inner space are exposed to the inner space;
In a position that is not exposed to the internal space inside the metal structure, the two metal parts are configured to have a boundary by contacting or close to each other without being bonded to each other, so that the two metal parts have a boundary through the discontinuous part. an inner non-joint portion formed at an inner position communicating with the space; and
In a position not exposed to the internal space inside the metal structure, a junction portion for closing one end of the inner non-junction portion so that the boundary between the two metal parts is indistinguishable or difficult to identify;
have,
The junction is located in one or substantially one plane and is formed to surround the interior space when viewed in a vertical direction perpendicular or substantially perpendicular to the plane,
The discontinuous portion is formed to surround the inner space when viewed in the vertical direction,
The inner non-junction portion has a portion extending in the vertical direction so that the discontinuous portion and the junction portion are located at different heights in the vertical direction,
metal structure. 10. The method of claim 9,
The metal structure,
In a position not exposed to the internal space inside the metal structure, the two metal parts are configured to have a boundary by contacting or close to each other without being bonded to each other, and not communicating with the internal space It is located in an outer position, and further has an outer non-joint portion whose one end is closed by the joint portion,
metal structure. 11. The method of claim 9 or 10,
The metal structure is a metal structure for heat transfer that is installed in contact with or close to an object to be heat exchanged, heated or cooled. 11. The method of claim 9 or 10,
The metal structure is a hollow metal structure used in a state in which the inner space is hollow, a metal structure.

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