JP2003340526A - Manufacturing method for curved composite material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a curved composite material which can prevent surface roughness and ensure uniformity of inside and outside wall thickness. <P>SOLUTION: The manufacturing method for the curved composite material is employed to manufacture a curved composite material 7 and comprises the steps of making a cylindrical composite material 19 by joining a plurality of members 8, 9 having approximately U-shaped cross sections or the like at longitudinal connecting parts 18 and bending the composite material 19, with the member 8, 9 held inside and outside, into such a designated shape as an arc or the like with a bending machine. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a curved composite material for producing a tubular curved composite material. 2. Description of the Related Art For roofs of outdoor structures, bent materials such as prismatic and cylindrical shapes obtained by bending an extruded material of aluminum or an aluminum alloy are used. Conventionally, when manufacturing this curved material, a curved material is manufactured by using an extruded material such as a square tube or a cylinder and bending the extruded material through a bending machine at a predetermined curvature. ing. For example, when using a three-roller type bending machine in which one top roll and two bottom rolls are arranged in a pyramid shape, a gap between the top roll and the bottom roll is provided. Through the cylindrical extrusion,
The extruded material is fed between the three rolls and bent into a predetermined arc shape to produce a curved material. [0005] When the cylindrical extruded material is bent into an arc shape as described above, the extruded material shrinks in the longitudinal direction on the inner peripheral side of the curved material, and the outer periphery of the curved material is extruded. On the side, the extruded material extends in the longitudinal direction, and the difference in expansion and contraction in the inside and outside in the longitudinal direction increases, so the surface of the curved material becomes rough, and the shrinking inner wall thickness increases and the expanding outer wall thickness increases. There is a problem that the thickness of the curved material is greatly different between the inside and outside of the curved material. The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a curved composite material capable of preventing surface roughness and ensuring uniformity of inner and outer thicknesses. [0007] A method of manufacturing a curved composite material according to the present invention comprises joining a plurality of members at a joint in a longitudinal direction to form a tubular composite material. Is formed by bending the above member inside and outside to produce a curved composite material. An embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 show a roof structure 1 for a passage. The roof structure 1 has a pair of curved girder members 2 and 3 which are curved in an arc shape in the horizontal direction, and which are erected on a ground G and each curved structure. One or a plurality of pillars 4 and 5 supporting the beam members 2 and 3, a plurality of beams 6 radiating on a pair of curved beam members 2 and 3, and straddling each beam 6. And a provided roof material (not shown). When connecting both ends and the like of the curved girder members 2 and 3 to other structures,
5 may be omitted. As shown in FIG. 3, a tubular curved composite material 7 such as a square tube is used for the curved beam members 2 and 3. The curved composite material 7 includes a pair of first and second members 8 and 9 which are arranged to face each other in the inward and outward directions, and which are joined from the inside in a state where both end edges of the first and second members 8 and 9 abut each other. And the joining member 10. For each of the members 8 to 10, an extruded material of aluminum or an aluminum-based alloy is used. The first member 8 and the second member 9 have substantially the same U-shaped cross section, and have a plate-shaped main body 11 and opposite sides from both sides in the width direction of the main body 11. And a bent plate-like joining edge 12 are provided integrally over the entire length in the longitudinal direction. Each of the joining edges 12 has a contact portion 13 bent from the edge thereof to the inside in the width direction of the main body portion 11, and a retaining edge bent from the inner end of each contact portion 13 toward the main body portion 11. A portion 14 and a regulating edge 15 that is separated from each contact portion 13 toward the main body 11 and protrudes inward from the joining edge 12 are formed integrally over the entire length in the longitudinal direction. Then, the first member 8 and the second member 9 are joined by the joining member 10 at the joining portion 18 in the longitudinal direction where the contact portions 13 of the joining edge portions 12 contact each other so as to form a square tube. I have. The joining member 10 has a square C-shaped cross section.
A pair of holding portions 16 for holding the contact portions 13 of the first member 8 and the second member 9 in abutting state, and a pair of recesses into which the retaining edge portions 14 on the inner end sides of the respective contact portions 13 are fitted. 17 are integrally provided, and the holding portion 16 is provided with the contact portion 13 of each of the members 8 and 9.
And the regulating edge 15. In addition, the contact portion 13 of the joining edge portion 12, the retaining edge portion 14, and the regulating edge portion 1
5 and the joining member 10 constitute a joining portion 18 in the longitudinal direction. When manufacturing the curved composite material 7, a bending machine 20 having the structure shown in FIG.
The manufacturing process shown in FIG. That is, in manufacturing the curved composite material 7, as shown in FIG. 5A, first, a straight first member 8, a second member 9, and a joining member 10 which are extruded members made of aluminum or an aluminum-based alloy are prepared. . Then, as shown in FIG. 5B, the first member 8 and the second member 9
In a state where the contact portions 13 of the respective joint edges 12 are abutted with each other, the two joint members 10 sandwiching the contact portions 13 are joined at the joint portion 18 in the longitudinal direction to form a rectangular tube as a whole. The composite material 19 is constituted. The joining member 10 includes a first member 8 and a second member 8.
After the contact portions 13 with the member 9 are abutted against each other, the contact portions 13 may be driven from one end in the longitudinal direction so as to be fitted to the two contact portions 13, or may be fitted to the contact portion 13 by another method. Is also good. Further, the joining portion 18 has such a joining force that the first member 8, the second member 9 and the joining member 10 are not completely fixed, and the three members slide relatively slightly in the longitudinal direction during the next bending process. It is desirable to join them together. Next, the straight rectangular tube-shaped composite material 19 is passed through a bending machine 20 as shown in FIG. 4, and the composite material 19 is bent while being continuously fed in its longitudinal direction. As shown in FIG. 5C, the curved composite material 7 is manufactured by being curved in a circular arc shape at a predetermined curvature. In this case, for example, the composite material 1 is placed in a state where the members 8 and 9 are directed inward and outward so that the first member 8 is inside and the second member 9 is outside.
9 is passed through a bending machine 20. The bending machine 20 is, for example, a three-roller type in which one top roll 21 and two bottom rolls 22 and 23 are arranged in a pyramid shape on a base 20a as shown in FIG. The composite material 1 is provided on each of the rolls 21 to 23.
A peripheral groove into which 9 fits is formed. The base 20a has side rolls 24 on the entry side and the exit side of the composite material 19, respectively.
25 and correction rolls 26 and 27 are arranged. The composite material 19 is inserted into the bending machine 20 from the entering side, and while the composite material 19 is being fed between the top roll 21 and the bottom rolls 22 and 23, the composite material 19 is passed through a predetermined circle. The curved composite material 7 is manufactured by performing a bending process for bending in an arc shape. In this case, the composite member 19 is divided into the first member 8 and the second member 8.
The first member 8 and the second member 9 are located on both sides in the inward and outward directions after bending, and the pair of joining members 10 are located in the middle between the inward and outward directions, while being configured by four members of the member 9 and the pair of joining members 10. Since the members 8, 9, and 10 are joined to the extent that they can relatively slide in the longitudinal direction at their contact portions,
Each of the members 8, 9, and 10 is plastically deformed so as to contract inside a substantially central portion in the inside and outside directions (bending direction) and expand outside the center. Accordingly, since the inside and outside of each of the members 8 to 10 expand and contract to form one curved composite material 7 as a whole, the entirety is subjected to bending using an extruded rectangular tubular material. Compared to the case, the difference in expansion and contraction between the inside and outside of each member 8 to 10 is reduced, and the surface roughness of the curved composite material 7 can be prevented, and the uniformity of the thickness of the inside and outside of the curved composite material 7 can be easily secured. it can. The contact portion 1 between the first member 8 and the second member 9
The joining member 10 that sandwiches the three in abutting state does not directly contact the rolls 21 to 23 or the like at the time of bending. However, the retaining edge 14 at the inner end of the abutting portion 13 is embraced by the concave portion 17 of the joining member 10, and the holding portion 16 is positioned between the abutting portion 13 of the joining edge 12 and the regulating edge 15. Since the first member 8 and the second member 9 are sandwiched from both sides, the first member 8 and the second member 9 are regulated so as not to move in the inside and outside directions (bending direction) and the direction orthogonal thereto. 2 members 9
A bending force is applied to the joining member 10 via the. Therefore, despite the fact that the first member 8 and the second member 9 are held in a joined state by the pair of joining members 10, the joining members are bent with the bending of the first member 8 and the second member 9. 1
0 can be easily and reliably curved. FIGS. 6A to 6C illustrate another embodiment in which the cross-sectional shape of the curved composite material 7 is different. FIG.
In the curved composite material 7 of (A), the first member 8 and the second member 9 are joined from the inside with a pair of joining members 10, and the first member 8 uses an extruded shape member having a substantially U-shaped cross section. The second member 9 is formed by using an extruded member having a substantially U-shaped cross section and having an arc-shaped main body 11. The first member 8 has substantially the same cross-sectional shape as the case of FIG. 3, and the second member 9 has a substantially U-shaped cross-section having joining edges 12 on both sides of an arc-shaped main body 11. The other configuration is the same as that of FIG. 3, such as the provision of the contact portion 13, the retaining edge 14, and the regulating edge 15 on the side of each joining edge 12. The curved composite material 7 shown in FIG.
The first member 8 and the second member 9 are joined from the inside by a pair of joining members 10 using extruded mold members having different widths and a substantially U-shaped cross section. Second member 9
, A joining edge portion 12 is provided on one side of the main body portion 11 with a bent portion 28 substantially parallel to the main body portion 11. And
The joining edge portion 12 is connected to one of the contact portions 1 on the distal end side.
3 and a protruding edge 29 having a regulating edge 15 and corresponding to one of the joining edges 12 of the second member 9. And one of the holding portions 16 of the joining member 10 is sandwiched between them.
The cross-sectional shapes of the second member 9 and the joining member 10 and other configurations are the same as those in FIG. The curved composite material 7 shown in FIG. 6C uses a first member 8 and a second member 9 each having a joining edge portion 12 on both sides of a semicircular main body portion 11. The abutment portions 12 are joined by a pair of joining members 10 in an abutting state to form a cylindrical shape as a whole. The joining edge 12, the joining member 10, and other configurations are the same as those in FIG. FIG. 7A shows a case where the curved composite material 7 is composed of two members 8 and 9 of a first member 8 and a second member 9.
(B) shows the curved composite material 7 as the first member 8, the second member 9 and the third member 8.
An embodiment in the case where it is constituted by three members 8, 9 and 32 with a member 32 will be described. That is, the curved composite material 7 shown in FIG.
The member 8 and the second member 9 are configured to have a substantially U-shaped cross section, and the edge side of the joint edge 12 is connected via a longitudinal joint 18 including a fitting protrusion 30 and a fitting recess 31. They are directly joined. Both the fitting projection 30 and the fitting recess 31 project inside the joining edge 12, and the fitting projection 30 has a dovetail structure and the fitting recess 31 has a dovetail structure.
Note that the first member 8 may be provided with the fitting recess 31 and the second member 9 may be provided with the fitting projection 30. The curved composite material 7 shown in FIG.
A third member 32 is interposed between the first member 9 and the second member 9, and these joining edges 12 are joined via a longitudinal joining portion 18 composed of a fitting projection 30 and a fitting recess 31. It is.
The first member 8 and the second member 9 are connected to the main body 11 and the joining edge 12.
A fitting projection 30 and a regulating edge 15 projecting inward are provided on the end edge side of the joining edge 12. The third member 32 has a plate-like connecting portion 33 disposed substantially at the center in the inward and outward directions, and a plate-like connecting portion 33 projecting from both ends in the width direction of the connecting portion 33 to both sides in the inward and outward directions of the curved composite material 7. H-shaped section with a joining edge 12
A fitting recess 31 that fits into the fitting projection 30 of each of the members 8 and 9 and is regulated by the regulation edge 15 is provided at the end edge of the projection 2 so as to project inward in the width direction. Although the fitting projection 30 has a dovetail structure and the fitting recess 31 has a dovetail structure, the fitting recess 31 is fitted to the first member 8 and the second member 9, and the fitting recess 31 is fitted to the third member 32. The protrusion 30 and the regulating edge 15 may be provided. As described above, when the curved composite material 7 is constituted by using the first member 8 and the second member 9 as main constituent members,
As shown in FIGS. 6A to 6C, the first member 8 and the second member 9 may be joined by a pair of joining members 10, or both may be joined directly as shown in FIG. You may. Further, as shown in FIG. 7B, the curved composite material 7 includes a first member 8,
The second member 9 and the third member 32 may be configured as main constituent members. In that case, the members 8, 9, 32 may be directly joined, or may be joined via the joining member 10 as in other embodiments. The first member 8 and the second member 9 or the first member 8
And the second member 9 and the third member 32 are directly or
6A, the sectional shapes of the members 8, 9, 32 can be variously changed as shown in FIGS. 6A to 6C. The curved composite material 7 may be curved with the first member 8 inside and the second member 9 outside, or vice versa. Further, the first member 8 and the second member 9 may be formed in other shapes, such as a substantially U-shaped cross section. Although the embodiments of the present invention have been described in detail, the present invention is not limited to the embodiments.
The present invention can be implemented in various other modes. For example, in the embodiment, the first member 8 and the second member 9 or the first member 8 and the second member 9 and the third member 32 are joined directly or via a pair of joining members 10 to form the composite material 19. Although the case of two members, three members or four members is illustrated, the composite material 19
The number of members in the case of (1) may be five, and may be a member composed of two or more members. The pair of joining members 10 are connected to the intermediate connecting portion 3 as shown by phantom lines in FIG.
3 may be integrally formed. In the case where there are two main components of the composite material 19 in the bending direction (inward and outward directions), the joint 18 is disposed substantially at the center of the composite material 19 in the bending direction. If there are three in the bending direction (inside and outside),
Each joint portion 18 is moved about 1 /
It is desirable that the joints 18 be arranged at substantially equal positions or at substantially equal intervals in the bending direction (inward and outward directions) of the composite material 19 in accordance with the number of main constituent members, such as being arranged at three intervals. The joining portion 18 may have any structure so that the members on both sides in the bending direction can be relatively slightly moved at the time of processing, and various changes can be made regardless of whether or not the joining member 10 is used. It is possible. The curved composite material 7 may be used for any purpose, such as an outdoor structure, an indoor structure, or a part of a machine tool. The material used is aluminum,
Alternatively, the present invention is not limited to the extrusion-type material of the aluminum alloy, and the present invention can be similarly applied to iron, stainless steel, and other metal materials. The bending machine 20 has one top roll 21.
The present invention is not limited to the three-roller type in which the and the two bottom rolls 22 and 23 are arranged in a pyramid shape, and various types can be used. According to the present invention, a plurality of members are joined at their joints in the longitudinal direction to form a cylindrical composite material, and the composite material is bent with the members inside and outside. Since the curved composite material is manufactured, there is an advantage that surface roughness of the surface of the curved composite material can be prevented and uniformity of the inner and outer wall thicknesses can be ensured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a roof structure according to an embodiment of the present invention. FIG. 2 is a plan view of a roof structure showing one embodiment of the present invention. FIG. 3 is a sectional perspective view of a curved composite material according to an embodiment of the present invention. FIG. 4 is an explanatory diagram of a bending state showing an embodiment of the present invention. FIG. 5 is a manufacturing process diagram of a curved composite material according to an embodiment of the present invention. FIGS. 6A to 6C are cross-sectional perspective views of a curved composite material according to another embodiment of the present invention. FIGS. 7A and 7B are cross-sectional perspective views of a curved composite material showing another embodiment of the present invention. [Description of Signs] 7 Curved composite material 8 First member 9 Second member 18 Joining portion 19 Composite material

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Tadaharu Miyazaki             763 Kami-Maoto, Takase-cho, Mitoyo-gun, Kagawa Prefecture             Nippon Koki Co., Ltd. (72) Inventor Kishi Furukawa             1785-2 Ikunocho, Zentsuji, Kagawa Prefecture F term (reference) 4E063 AA11 AA19 BB03 JA04 MA10

Claims (1)

Claims: 1. A cylindrical composite material is formed by joining a plurality of members at a joint in a longitudinal direction thereof, and the composite material is subjected to bending processing with the inside and outside of the member. A method for producing a curved composite material, comprising producing a curved composite material.