Plate joint structure and manufacturing method

Abstract

To provide a joint structure and a manufacturing method of a plate which can make setting of a plate thickness flexible and inhibit increase of the number of components while securing sufficient rigidity and strength.SOLUTION: A joint structure 1 of a plate includes: a first plate 10 having a pair of flange parts 12 and having a hat shaped cross section; and a second plate 20 which is in contact with the pair of flange parts 12 and joined thereto. The joint structure 1 is formed in a cylindrical shape. Each of the pair of flange parts 12 has a lower surface 121 which contacts with the second plate 20; and an upper surface 122 located at the opposite side of the lower surface 121. At the upper surface 122 of each flange part 12, a reinforcement part 13 provided at a position different from a joint part 30 between the first plate 10 and the second plate 20 and protruding to the opposite side of the second plate 20 is integrally provided. The reinforcement part 13 is formed between the lower surface 121 and the upper surface 122 of the first plate 10 and includes a closed cross sectional space S2 having a closed cross section when viewed in a direction orthogonal to a longitudinal direction and a plate thickness direction of the flange part 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joining structure for plate materials and a manufacturing method thereof. [Background technology]

[0002] In recent years, efforts to provide access to sustainable transport systems that take into consideration vulnerable transport users such as the elderly, people with disabilities and children have been gaining momentum. To achieve this, we are focusing on research and development to further improve transport safety and convenience through development of vehicle body rigidity.

[0003] For example, Patent Document 1 describes a vehicle body structure in which a floor material and a flange portion of a reinforcing member are joined by welding. A protruding portion is provided on the tip surface of the flange portion of the reinforcing member, ensuring a sufficient welding area to the reinforcing member and increasing the welding strength. It also describes how the reinforcing member is set to an appropriate thickness for the thin floor material, increasing the strength and rigidity of the floor material, while forming the weld portion of the reinforcing member thin to enable spot welding.

[0004] Furthermore, Patent Document 2 describes a structure in which the rear end of a front side frame and the front end of a floor frame of an automobile are joined by spot welding. In Patent Document 2, a stiffener (reinforcing member) is provided that forms a closed cross section between the floor frame and the stiffener. The stiffener, which is added as a separate part, has a flange portion, and the stiffener, floor frame, and front side frame are joined by overlapping and spot welding three plate materials consisting of the flange portion of the stiffener, the flange portion of the floor frame, and the flange portion of the front side frame. In Patent Document 2, spot welding of four plate materials (front side frame, floor frame, stiffener, and floor panel) is avoided in order to ensure sufficient welding strength. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-284987 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-290154 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, the welded portion of the reinforcing member is formed thin, but compared to the thickness of the floor material to be welded, the thickness of the welded portion of the reinforcing member is set to about three times the thickness of the floor material. To further improve the quality of the weld, it is desirable to reduce the difference in thickness between the welded portion of the reinforcing member and the floor material. However, because the reinforcing member is processed by press forming, it is difficult to further reduce the thickness of the welded portion of the reinforcing member. In other words, due to limitations in the manufacturing process, the thickness of the reinforcing member, including the welded portion, is set to a certain thickness, which limits the setting of the thickness.

[0007] A stiffener is provided in the joining structure of Patent Document 2. By providing the stiffener, it is not necessary to provide an additional plate material to increase the strength of the frame, but the stiffener itself is provided as a separate part, which increases the number of parts.

[0008] Although various structures have been proposed for increasing the rigidity and strength of plate joining structures, there is still room for improvement, for example, from the viewpoint of the aforementioned limitations on plate thickness and the increased number of parts.

[0009] The present invention provides a joining structure and manufacturing method for plate materials that allows for flexibility in setting plate thickness and suppresses an increase in the number of parts while ensuring sufficient rigidity and strength. [Means for solving the problem]

[0010] The present invention provides a first plate member having a pair of flange portions and a hat-shaped cross section; a second plate member abutting and joined to the pair of flange portions of the first plate member; A joining structure for a cylindrically formed plate material, comprising: the pair of flange portions of the first plate member have a first surface that abuts against the second plate member and a second surface that is located on the opposite side to the first surface, a reinforcing portion provided integrally on the second surface of each flange portion, the reinforcing portion being provided at a position different from the joint portion between the first plate material and the second plate material and protruding to an opposite side from the second plate material; The reinforcing portion includes a closed cross-sectional space that is formed between the first surface and the second surface of the first plate material and has a closed cross section when viewed from a direction perpendicular to the longitudinal direction and plate thickness direction of the flange portion.

[0011] The present invention also provides A method for manufacturing the first plate material used in the above-mentioned plate material joining structure, The first plate material is integrally formed by additive manufacturing. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a degree of freedom in setting the plate thickness and suppress an increase in the number of parts while ensuring sufficient strength. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view of a plate material joining structure 1 according to one embodiment of the present invention, in which a joint 30 is formed by spot welding. [Figure 2] 1 is an exploded perspective view of a plate material joining structure 1 as viewed from below. [Figure 3] 1 is a perspective view of a joining structure 1 of plate materials, in which a joining portion 30 is formed by arc welding or laser welding. [Figure 4] FIG. 2 is a view of the reinforcing portion 13 as viewed from the left and right direction. [Figure 5] 10 is a perspective view of a first plate member 10 provided with a reinforcing portion 13A according to a first modification. FIG. [Figure 6] 10 is a perspective view of a first plate member 10 provided with a reinforcing portion 13B according to a second modification. FIG. [Figure 7] 13 is a perspective view of a first plate member 10 provided with a reinforcing portion 13C according to a third modification. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of a plate joining structure and a manufacturing method thereof according to the present invention will be described with reference to the accompanying drawings.

[0015] (Bonding structure of plate materials) As shown in FIGS. 1 and 2, the plate joining structure 1 includes a first plate 10 and a second plate 20, and is formed into a cylindrical shape by joining the first plate 10 and the second plate 20. The plate joining structure 1 is, for example, a pillar or a side sill provided on an automobile. However, the plate joining structure 1 is not limited to this and can be applied to various uses as long as it is formed into a cylindrical shape by joining at least two plate materials, and is not limited to parts provided on an automobile. For convenience of explanation, the extending direction of the cylindrical shape is defined as the front-rear direction, the direction in which the first plate 10 and the second plate 20 overlap (the plate thickness direction) is defined as the up-down direction, and the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction, but these directions are unrelated to the actual directions.

[0016] The first plate material 10 has a hat-shaped cross section when viewed from the front-to-rear direction. Specifically, the first plate material 10 has a recess 11 and a pair of flange portions 12 provided in the recess 11. In this embodiment, the recess 11 has a top plate portion 111 and a pair of vertical wall portions 112 provided at an incline on both ends of the top plate portion 111 in the left-to-right direction. The pair of flange portions 12 are connected to the pair of vertical wall portions 112.

[0017] The pair of flange portions 12 have a lower surface 121 and an upper surface 122 located on the opposite side to the lower surface 121. The second plate member 20 abuts against the lower surface 121.

[0018] The second plate material 20 has a flat plate shape. The second plate material 20 is thinner than the first plate material 10. The second plate material 20 abuts against and is joined to a pair of flange portions 12 of the first plate material 10. Reinforcing portions 13 are integrally formed on the pair of flange portions 12, and joint portions 30 between the first plate material 10 and the second plate material 20 are provided at positions on the pair of flange portions 12 that are different from the reinforcing portions 13. Details of the reinforcing portions 13 will be described later.

[0019] The thickness of the first plate material 10 at the joint 30 is thinner than the thickness of other parts of the first plate material 10, i.e., the thickness of the recess 11 and the thickness of the reinforcing portion 13 (the distance between the lower surface 121 and the upper surface 122 of the reinforcing portion 13). In addition, the thickness of the first plate material 10 at the joint 30 is formed to be approximately the same as the thickness of the second plate material 20.

[0020] The joint 30 is formed, for example, by welding the first plate material 10 and the second plate material 20 together. Examples of welding methods include spot welding, arc welding, and laser welding. Spot welding is performed on the overlapping surfaces of the first plate material 10 and the second plate material 20 as indicated by the black circles in Fig. 1, and arc welding or laser welding is performed on the outer edges of the first plate material 10 and the second plate material 20 as indicated by the thick solid lines in Fig. 3.

[0021] By joining a first plate material 10 having a hat-shaped cross section and a second plate material 20 having a flat plate shape, an internal space S1 is formed surrounded by the first plate material 10 and the second plate material 20. In other words, the plate material joining structure 1 is formed in a cylindrical shape having the internal space S1. The cross section of the plate material joining structure 1 is trapezoidal when viewed from the front-to-rear direction.

[0022] Next, details of the reinforcing portions 13 will be described with reference to Fig. 4. Note that, hereinafter, the pair of flange portions 12 will also be simply referred to as flange portions 12. The front-rear direction will also be referred to as the longitudinal direction of the plate material joining structure 1 or the longitudinal direction of the flange portions 12.

[0023] The reinforcing portion 13 is provided integrally with the upper surface 122 of the flange portion 12, and is a protruding portion that protrudes on the side opposite to the second plate member 20. The protruding surface of the reinforcing portion 13 forms part of the upper surface 122 of the flange portion 12.

[0024] The reinforcing portion 13 protrudes to form a trapezoidal shape when viewed in a direction perpendicular to the longitudinal direction and thickness direction of the flange portion 12 (i.e., the left-right direction). As shown in Figures 1 and 3, the reinforcing portion 13 extends in the left-right direction from the vertical wall portion 112 of the recess 11 to the tip of the flange portion 12, and has a length that is approximately the same as the length of the flange portion 12 in the left-right direction.

[0025] As described above, the reinforcing portion 13 is provided at a position different from the joint portion 30 between the first plate material 10 and the second plate material 20. That is, at the reinforcing portion 13, the first plate material 10 and the second plate material 20 are in contact with each other but are not joined together.

[0026] As shown in Fig. 4, the reinforcing portion 13 is formed between the lower surface 121 and the upper surface 122 of the first plate material 10, and includes a closed cross-sectional space S2 having a closed cross section when viewed from a direction perpendicular to the longitudinal direction and plate thickness direction of the flange portion 12 (i.e., the left-right direction). A plurality of wall portions 130, which will be described later, are provided in the closed cross-sectional space S2, and the closed cross section of the closed cross-sectional space S2 forms a geometric shape (a truss structure) when viewed from the left-right direction. The closed cross-sectional space S2 penetrates in the left-right direction and communicates with the internal space S1 of the plate material joining structure 1 (see Figs. 1 to 3).

[0027] The plate material joint structure 1 has increased rigidity due to the inclusion of the reinforcing portion 13 having the above-described configuration. More specifically, the reinforcing portion 13 improves the bending rigidity of the plate material joint structure 1. For example, when the rear end portion of the plate material joint structure 1 is fixed and a predetermined load is applied upward to the center of the front end of the first plate material 10, the plate material joint structure 1 is displaced less upward than when the reinforcing portion 13 is not provided. Furthermore, the reinforcing portion 13 also increases the strength of the plate material joint structure 1.

[0028] As described above, the first plate material 10 is integrally provided with the reinforcing portion 13 that protrudes to the opposite side from the second plate material 20 at a position different from the joint 30 between the first plate material 10 and the second plate material 20. The reinforcing portion 13 includes a closed cross-sectional space S2. The reinforcing portion 13 that includes such a closed cross-sectional space S2 can increase the rigidity and strength of the plate material joining structure 1.

[0029] Furthermore, since the reinforcing portion 13 is provided integrally with the first plate material 10, an increase in the number of parts can be suppressed compared to when the reinforcing portion is provided separately from the first plate material.

[0030] In this embodiment, in order to further increase the rigidity and strength of the plate material joining structure 1, a plurality of reinforcing portions 13 are provided along the longitudinal direction on the upper surface 122 of each flange portion 12. Adjacent reinforcing portions 13 are provided at a predetermined interval.

[0031] Furthermore, a plurality of joints 30 are provided along the longitudinal direction of each flange portion 12, with a plurality of reinforcing portions 13 and a plurality of joints 30 being provided alternately along the longitudinal direction. Here, joints 30 are provided at the front end and rear end of each flange portion 12 in the longitudinal direction. By providing a plurality of joints 30 along the longitudinal direction, the joint between the first plate material 10 and the second plate material 20 is strengthened. Furthermore, by providing a plurality of reinforcing portions 13 and a plurality of joints 30 alternately along the longitudinal direction, the rigidity and strength of the plate material joining structure 1 can be further increased.

[0032] Furthermore, the closed cross-sectional space S2 is provided with a plurality of wall portions 130 that divide the closed cross-sectional space S2 into a plurality of spaces. Each wall portion 130 is provided vertically or at an angle from the bottom to the top of the closed cross-sectional space S2. When viewed from the left and right, each space formed by division by the plurality of wall portions 130 has a triangular shape. The plurality of wall portions 130 function as stiffeners to further increase the rigidity and strength of the closed cross-sectional space S2. Note that, although a plurality of wall portions 130 are provided in this embodiment, this is not limiting. For example, a configuration may be adopted in which only one wall portion 130 is provided to divide the closed cross-sectional space S2 into two spaces.

[0033] (Plate thickness at joint) Next, the plate thickness of the first plate material 10 and the second plate material 20 at the joint 30 will be described. When the reinforcing portion 13 is not provided, at least one of the two plate materials at the joint (for example, the first plate material) is generally formed thick to increase the rigidity and strength of the joint structure of the plate materials.

[0034] In this embodiment, the plate joining structure 1 has sufficient rigidity and strength due to the reinforcing portion 13. Therefore, it is not necessary to make the first plate 10 thick at the joint 30. In other words, the reinforcing portion 13 allows for flexibility in setting the plate thickness at the joint 30. For example, the first plate 10 at the joint 30 can be made thinner, leading to weight reduction.

[0035] Furthermore, when the joint 30 is formed by welding, the thickness ratio of the first plate material 10 to the second plate material 20 at the joint 30 is desirably 1:1 to improve weld quality. This is because a difference in plate thickness can result in an inconsistent weld or unstable welding. Conventionally, for example, if the thickness of the first plate material 10 is increased from the viewpoint of rigidity and strength, improving weld quality requires increasing the thickness of the second plate material 20, which increases the weight of the plate materials. In contrast, as described above, the plate material joining structure 1 allows for flexibility in setting the plate thickness at the joint 30. Therefore, the plate thicknesses of the first plate material 10 and the second plate material 20 can be made approximately the same, resulting in a thickness ratio of 1:1, thereby improving weld quality. In other words, by welding the thin-walled first plate material 10 to the thin-walled second plate material 20 at the joint 30, both improved weld quality and weight reduction can be achieved.

[0036] (Production of the first board) The first plate material 10 of this embodiment is integrally formed by additive manufacturing (hereinafter also referred to as AM technology), which can produce parts with complex three-dimensional shapes by stacking and solidifying metal powder material layer by layer. This makes it possible to produce parts with fine and complex three-dimensional shapes that are difficult to produce using conventional manufacturing methods such as machining and casting.

[0037] The closed cross-sectional space S2 of the first plate material 10 is provided between the lower surface 121 and the upper surface 122 of the flange portion 12, and so can have a fine structure, but by using AM technology, it is possible to manufacture the first plate material 10 having the closed cross-sectional space S2 as a single unit. Furthermore, the multiple wall portions 130 provided in the closed cross-sectional space S2 can also have a fine and complex three-dimensional shape, but by using AM technology, it is possible to manufacture the first plate material 10 having the multiple wall portions 130 as a single unit.

[0038] Furthermore, AM technology makes it easy to make the thickness of the first plate material 10 at the joint 30 thinner than the thickness of other parts (recesses 11 and reinforcing parts 13). Therefore, the thickness of the first plate material 10 at the joint 30 can be set in consideration of the rigidity and strength actually required for the plate joint structure 1 and the thickness of the second plate material 20.

[0039] Furthermore, after the first plate material 10 is produced by AM technology, unsolidified metal powder may remain inside the closed cross-sectional space S2. When the closed cross-sectional space S2 is configured to penetrate in the left-right direction, the metal powder that has remained inside the closed cross-sectional space S2 can be easily removed by, for example, blowing high-pressure air into the closed cross-sectional space S2.

[0040] Variation 1 5, in Modification 1, the closed cross-sectional space S2A of the reinforcing portion 13A provided in the first plate material 10 does not penetrate in the left-right direction. Specifically, the closed cross-sectional space S2A does not communicate with the internal space S1 of the plate material joining structure 1. Even with this configuration of the reinforcing portion 13A, the rigidity and strength of the plate material joining structure 1 can be increased.

[0041] Variation 2 6, in the second modification, no wall portion 130 is provided in the closed cross-sectional space S2B of the reinforcing portion 13B provided in the first plate material 10. Even with this configuration of the reinforcing portion 13B, the rigidity and strength of the plate material joining structure 1 can be increased.

[0042] Variation 3 7, in Modification 3, the reinforcing portion 13C provided on the first plate material 10 extends in the left-right direction from the vertical wall portion 112 of the recess 11 to the center of the flange portion 12. Even with this configuration of the reinforcing portion 13C, the rigidity and strength of the plate material joining structure 1 can be increased.

[0043] Furthermore, in the third modification, when the joint 30 is formed by arc welding or laser welding, the joint 30 can be formed along the entire outer edge of the flange 12 in the longitudinal direction.

[0044] Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above embodiment may be combined in any manner without departing from the spirit of the invention.

[0045] For example, in the above-described embodiment, when viewed from the longitudinal direction (front-rear direction) of the plate material joining structure 1, the cross section of the plate material joining structure 1 is trapezoidal, but this is not limited to this and can be any shape. For example, the cross section of the plate material joining structure 1 may be semicircular, semielliptical, rectangular, approximately U-shaped, approximately V-shaped, etc. In this case, the recess 11 of the first plate material 10 is formed in one of these shapes.

[0046] Furthermore, the second plate member 20 does not have to be flat. For example, the second plate member 20 may have a recess and a pair of flange portions, like the first plate member 10.

[0047] Furthermore, the joint 30 is not limited to a configuration formed by welding, but may be mechanically fastened, for example, by a self-piercing rivet. In the above-described embodiment, the plate thickness of the joint 30 can be set with a degree of freedom, so that a plate thickness suitable for fastening by a self-piercing rivet can be set.

[0048] The joint 30 may also be formed using a brazing material or an adhesive. For example, the joint 30 may be formed by applying a paste-like brazing material to a portion of the contact surface between the first plate material 10 and the second plate material 20 and heating the applied material, or the joint 30 may be formed by applying an adhesive to a portion of the contact surface.

[0049] This specification describes at least the following: In parentheses, components corresponding to those in the above-described embodiments are shown as examples, but the present invention is not limited to these.

[0050] (1) A first plate material (first plate material 10) having a pair of flange portions (a pair of flange portions 12) and a hat-shaped cross section; a second plate member (second plate member 20) abutting and joined to the pair of flange portions of the first plate member; A joining structure for plate materials formed in a cylindrical shape (joining structure for plate materials 1) comprising: the pair of flange portions of the first plate member have a first surface (lower surface 121) that abuts against the second plate member and a second surface (upper surface 122) that is located on the opposite side to the first surface, The second surface of each flange portion is provided at a position different from the joint portion (joint portion 30) between the first plate material and the second plate material, and is integrally provided with a reinforcing portion (reinforcing portion 13, 13A, 13B, 13C) that protrudes to the opposite side from the second plate material, The reinforcing portion is formed between the first surface and the second surface of the first plate material, and includes a closed cross-sectional space (closed cross-sectional space S2, S2A, S2B) having a closed cross section when viewed from a direction perpendicular to the longitudinal direction and plate thickness direction of the flange portion (left-right direction), Jointed structure of plate materials.

[0051] According to (1), a reinforcing portion is integrally formed on the first plate material, protruding toward the opposite side from the second plate material, at a position different from the joint between the first plate material and the second plate material. The reinforcing portion includes a closed cross-sectional space. This configuration increases the rigidity and strength of the plate material joint structure. Furthermore, since the plate material joint structure has sufficient rigidity and strength due to the reinforcing portion, there is no need to increase the plate thickness at the welded portion to increase the rigidity and strength, allowing for flexibility in setting the plate thickness at the joint. Furthermore, because the reinforcing portion is integrally formed on the first plate material, the increase in the number of parts can be suppressed compared to when the reinforcing portion is provided separately from the first plate material.

[0052] (2) The joining structure of the plate material according to (1), the joint is formed by welding the first plate material and the second plate material, At the joint, the plate thicknesses of the first plate material and the second plate material are substantially the same. Jointed structure of plate materials.

[0053] According to (2), uniform and stable welding can be performed, and the welding quality can be improved.

[0054] (3) A joining structure of plate materials according to (1) or (2), A plurality of the reinforcing portions are provided on the second surface of each flange portion along the longitudinal direction. Jointed structure of plate materials.

[0055] According to (3), the rigidity and strength of the joining structure of the plate materials can be further increased.

[0056] (4) The joining structure of the plate material according to (3), Each flange portion has a plurality of joint portions provided along the longitudinal direction, The plurality of joint portions and the plurality of reinforcing portions are alternately provided along the longitudinal direction. Jointed structure of plate materials.

[0057] According to (4), since a plurality of joints are provided along the longitudinal direction, the joint between the first plate material and the second plate material is strong. Furthermore, since the plurality of joints and the plurality of reinforcing parts are provided alternately along the longitudinal direction, the rigidity and strength of the joint structure of the plate materials can be further increased.

[0058] (5) A joining structure of plate materials according to any one of (1) to (4), The closed cross-sectional space of the reinforcing portion is provided with at least one wall portion (wall portion 130) that divides the closed cross-sectional space into a plurality of portions. Jointed structure of plate materials.

[0059] According to (5), the rigidity and strength of the closed cross-sectional space can be increased, and the rigidity and strength of the entire joining structure of plate materials can be further increased.

[0060] (6) A joining structure of plate materials according to any one of (1) to (5), The first plate material is integrally formed by additive manufacturing, Jointed structure of plate materials.

[0061] According to (6), the first plate member provided with the reinforcing portion including the closed cross-sectional space can be integrally formed.

[0062] (7) The joining structure of the plate material according to (6), The hat-shaped cross section of the first plate material is constituted by a recess (recess 11) and the pair of flange portions provided in the recess, The first plate material is formed so that the plate thickness of the joint portion is thinner than the plate thickness of the recess portion. Jointed structure of plate materials.

[0063] According to (7), the thickness of the first plate material at the joint can be easily designed by additive manufacturing, taking into account the rigidity and strength actually required for the joint structure of the plate materials and the thickness of the second plate material.

[0064] (8) A joining structure of plate materials according to (6) or (7), The closed cross-sectional space of the reinforcing portion penetrates in a direction perpendicular to the longitudinal direction and the plate thickness direction of the flange portion. Jointed structure of plate materials.

[0065] After the first plate material is formed by additive manufacturing, the material used in additive manufacturing may remain inside the closed cross-sectional space. According to (8), the closed cross-sectional space penetrates in a direction perpendicular to the longitudinal direction of the flange portion and the plate thickness direction, so that the material remaining inside the closed cross-sectional space can be easily removed.

[0066] (9) A method for manufacturing the first plate material used in the plate material joining structure according to any one of (1) to (5), The first plate material is integrally formed by additive manufacturing. Manufacturing method.

[0067] According to (9), the first plate member provided with the reinforcing portion including the closed cross-sectional space can be integrally formed.

[0068] (10) The manufacturing method according to (9), The hat-shaped cross section of the first plate material is constituted by a recess (recess 11) and the pair of flange portions provided in the recess, The first plate material is formed so that the plate thickness of the joint portion is thinner than the plate thickness of the recess portion. Manufacturing method.

[0069] According to (10), the thickness of the first plate material at the joint can be easily designed by additive manufacturing, taking into account the rigidity and strength actually required for the joint structure of the plate materials and the thickness of the second plate material. [Explanation of symbols]

[0070] 10 First plate material 11 Recess 12 Pair of flanges 121 Bottom surface (first surface) 122 Top surface (second surface) 13,13A,13B,13C Reinforcement part 130 Wall section 20. Second board material 30 Joint S2, S2A, S2B Closed Section Space

Claims

1. a first plate member having a pair of flange portions and a hat-shaped cross section; a second plate member abutting and joined to the pair of flange portions of the first plate member; A joining structure for a cylindrically formed plate material, comprising: The pair of flange portions of the first plate member have a first surface that abuts against the second plate member and a second surface that is located on the opposite side to the first surface, a reinforcing portion is integrally provided on the second surface of each flange portion, the reinforcing portion being provided at a position different from the joint portion between the first plate material and the second plate material and protruding to an opposite side from the second plate material; The reinforcing portion includes a closed cross-sectional space formed between the first surface and the second surface of the first plate material, and having a closed cross-section when viewed from a direction perpendicular to the longitudinal direction and the plate thickness direction of the flange portion. Jointed structure of plate materials.

2. The joining structure of plate materials according to claim 1, the joint portion is formed by welding the first plate material and the second plate material, At the joint portion, the plate thicknesses of the first plate material and the second plate material are substantially the same. Jointed structure of plate materials.

3. The joining structure of plate materials according to claim 1 or 2, a plurality of the reinforcing portions are provided on the second surface of each flange portion along the longitudinal direction; Jointed structure of plate materials.

4. The joining structure of plate materials according to claim 3, Each flange portion has a plurality of joint portions provided along the longitudinal direction, The plurality of joint portions and the plurality of reinforcing portions are alternately provided along the longitudinal direction. Jointed structure of plate materials.

5. The joining structure of plate materials according to claim 1 or 2, The closed cross-sectional space of the reinforcing portion is provided with at least one wall portion that divides the closed cross-sectional space into a plurality of sections. Jointed structure of plate materials.

6. The joining structure of plate materials according to claim 1 or 2, The hat-shaped cross section of the first plate material is configured by a recess and the pair of flange portions provided in the recess, The first plate material is formed so that the plate thickness of the joint portion is thinner than the plate thickness of the recess portion. Jointed structure of plate materials.

7. The joining structure of plate materials according to claim 1 or 2, The closed cross-sectional space of the reinforcing portion penetrates in a direction perpendicular to the longitudinal direction and the plate thickness direction of the flange portion. Jointed structure of plate materials.

8. A method for manufacturing the first plate material used in the plate material joining structure according to claim 1 or 2, The first plate material is integrally formed by additive manufacturing. Manufacturing method.

9. The manufacturing method according to claim 8, The hat-shaped cross section of the first plate material is configured by a recess and the pair of flange portions provided in the recess, The first plate material is formed so that the plate thickness of the joint portion is thinner than the plate thickness of the recess portion. Manufacturing method.

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