JPS633941A - Preparation of grid structure - Google Patents

Abstract

PURPOSE:To simplify control at the time of manufacturing, by laminating two prepreg materials each having a specific structure in a definite mold, and shaping and pressing the prepreg materials by the other mold and applying curing treatment to the prepreg materials to form a grid structure. CONSTITUTION:A predetermined number of first prepreg materials 1 are turned in the same direction to be arranged to a female mold in the circumferential direction thereof and second prepreg materials 2 are respectively arranged between the first prepreg materials 1. Next, the first prepreg materials are laminated to the first prepreg materials 1 previously arranged in a state crossing in a frame part and the second prepreg materials are laminated in the same way and this operation is repeatedly performed hereinafter. After both prepreg materials 1, 2 are laminated up to a predetermined thickness, male molds 18, 19 are fixed to rings 13, 14 and a cylindrical member 12 to mold the prepreg materials 1, 2 under pressure. Subsequently, heat-treatment is applied to the prepreg materials 1, 2 to form a grid structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for producing a grid structure of fiber-reinforced plastic acid.

(Prior Art) Generally, as a grid structure made of fiber reinforced plastic (FRP), for example, No. 45! There is something like the one shown in J.

The grid structure G in the figure includes a pair of ring-shaped frames 101
, 102, and a large number of crosspieces 10 that integrally intersect between both frame parts 101 and 102 and connect both frame parts 101 and 102.
It has a cylindrical shape with a M-fiber reinforced plastic (CFRP) using carbon fiber is used.

Conventionally, in manufacturing the grid structure G, as shown in FIGS. 5(a) to 5(d), various types of prepreg materials were used for each part.

The prepreg material can be roughly divided into frame prepreg material, connecting part prepreg material used near the connecting part with the frame,
It is divided into prepreg material and crosspiece prepreg material. The prepreg material for the frame portion is a prepreg material A1 that corresponds only to the frame portion,
There is a prepreg material A2 corresponding to a part of the frame part and the connecting part. The prepreg material for the connecting portion is prepreg material B1. corresponding to a part of the connecting portion. B2, and prepreg materials B3 and B4 corresponding to the frame portion and part of the crosspiece in addition to the connecting portion. The prepreg material for the crosspiece consists of prepreg materials CI, C3, C5, and C7 that extend straight from one frame side beyond the intersection of the crosspieces to the other frame side, and from the frame side to the intersection of the crosspieces. Corresponding prepreg materials C2, C4, C6, C8 between
Depending on the dimensions of the connecting prepreg materials B1 to B4, there are some that correspond to part of the frame and the connecting section, and others that have different length dimensions.

In order to manufacture the grid structure G, each of the prepreg materials AI, A2. B1-B4. After laminating C1 to C8 in appropriate combinations and repeating the same lamination pattern, the prepreg material is pressed and shaped with a male mold, and further hardened to form the grid structure G. As a method for manufacturing such a grid structure, there is, for example, Japanese Patent Application No. 86231/1989, which was previously filed by the applicant of the present invention.

(Problems to be Solved by the Invention) However, the method for manufacturing a grid structure as described above has advantages such as being able to orient fibers in multiple directions and performing partial reinforcement. However, since there are many types of prepreg materials, the management during manufacturing is complicated and the work takes a relatively long time, and an improvement has been desired.

(Objective of the Invention) The present invention has been made in view of such conventional demands, and it is possible to obtain sufficient strength of the grid structure by taking advantage of the advantages of the conventional technology, and also to improve management during manufacturing. It is an object of the present invention to provide a method for manufacturing a grid structure that can be simplified and improve workability.

[Structure of the Invention] (Means for Solving the Problems) A method for manufacturing a grid structure according to the present invention includes a pair of frame portions, a crosspiece portion that intersects between the two frame portions and connects the two frame portions; When manufacturing a grid structure made of fiber-reinforced plastic with Using a second prepreg material having a portion extending to the center of the section, the first prepreg material is laminated in one mold so that the first prepreg material intersects sequentially at the crosspiece, and then the prepreg material is laminated in the other mold. The method is characterized in that a prepreg material is pressed and shaped, and then the prepreg material is subjected to a curing treatment to form a grid structure.

(Example) The present invention will be explained below based on the drawings.

FIGS. 1 to 3 are diagrams illustrating an embodiment of the present invention. Note that this embodiment exemplifies the case where a grid structure that is substantially the same as the grid structure (see FIG. 4) shown in the section of the prior art is manufactured.

FIG. 1 is a diagram for explaining the prepreg material used in the manufacturing method. When explaining each part of the grid structure based on this diagram, the grid structure includes a pair of ring-shaped frames 101 and 102, A crosspiece 1 that integrally intersects at the center of both frame parts 101 and 102 and connects both frame parts 101 and 102.
03, the part where the inner edges (edges facing each other) of each frame part 101, 102 and the crosspiece 103 approaching from two directions are integrated is the connecting part 104, and the center of the crosspiece 103 is the intersection part. 105. The grid structure has a cylindrical shape in which the above configuration is continuous in the circumferential direction.

The prepreg material is, for example, a mat made of oriented carbon fibers impregnated with a thermosetting resin and dried. A first strip-shaped prepreg material 1,
It constitutes the frame part 101 (102) and the frame part 101 (
102) to the intersection 105 of the crosspiece 103 (part of the crosspiece 103).
There is. In the first prepreg material 1, the portion corresponding to the connecting portion 104 and a part of the frame portions 101 and 102 is aligned with the axis of the grid structure with respect to the portion corresponding to the crosspiece portion 103 beyond the intersection portion 105. Direction (left/right direction in Figure 1)
The fibers are oriented along the longitudinal direction of this shape. The second prepreg material 2 has a frame portion 101.
102, a part of the connecting portion 104, and the crosspiece 103 extending from the connecting portion 104 to the intersection portion 105, forming a shape of a grid structure together with the first prepreg material 1,
In this embodiment, the fibers are oriented in two orthogonal directions.

Note that both prepreg materials 1 and 2 are formed to have substantially the same thickness.

FIG. 3 is a diagram illustrating an example of an apparatus used for manufacturing a grid structure, and reference numeral 10 denotes a core having a cylindrical shape and rotatably held around a shaft 11.
A female mold is constructed by closing one mold on the outer periphery of the 0. In constructing this female mold, on the outer periphery of the core 10,
Dividable cylindrical member 12 and rings 1 located at both ends thereof
At the same time, a plurality of rhombic jigs 15 are arranged along the circumferential center of the cylindrical member 12, and a triangular jig 16 is further arranged between each rhombic jigs 15. It is set up. Note that each of the jigs 15 and 16 is fixed using bolts and is removable. The above-mentioned device forms forming grooves 17 that match the shape of the grid structure between each ring 13.14 and each jig 15.16.

Further, reference numerals 18 and 1 are the other molds, a male mold for the frame and a male mold for the crosspiece, and both male molds 18° and 12 are divided into several parts (partially shown in the figure). , protrusions 18a and 19L are respectively opposed to the frame portion forming portion and the crosspiece forming portion in the forming groove 17. Both male and female molds 18 and 1 are connected to the ring 13, 14 and the cylindrical member 12 using bolts.
can be fixed to.

To manufacture a grid structure using the above-mentioned apparatus, first, both prepreg materials 1.2 described above are laminated in the forming groove 17 of the female mold. In this lamination process, a predetermined number of first prepreg materials 1 are arranged in the same direction in the circumferential direction of the female mold, and a second prepreg material 2 is placed between each of the first prepreg materials 1.
Next, as shown in FIG. 2, the first prepreg material 1 is arranged in a shape S (the state shown in FIG. Then, the second prepreg material 2 was laminated in the same way (the state turned upside down with respect to the figure), and the same process was repeated, and both prepreg materials 1 and 2 were laminated to a predetermined thickness. Later on, the rings 13, 14 and the cylindrical member 12
The prepreg materials 1 and 2 are pressed and shaped by fixing the respective male molds 18 and 19 to the molds, and then heat treatment (hardening treatment) is performed on the prepreg materials 1 and 2 to form a grid structure (see FIG. 4). do. Note that the grid structure after formation has rings 13, 14, . Each jig 15, 16 and cylindrical member 12
Remove or disassemble and take out.

The grid structure manufactured in this way was formed with a simple lamination pattern using two types of prepreg materials 1 and 2, but the orientation state of m#I, which affects strength, was adjusted throughout each part. Not only can the number of joints between the prepreg materials be reduced significantly, but especially in this example, since the second prepreg material 2 with fibers oriented in two orthogonal directions is used, the strength can be further increased. This can be further improved. It is also possible to orient the fibers in more directions or to partially reinforce the fibers. For example, during the lamination process or during finishing, other prepregs can be wrapped around the circumferential direction of the frames 101 and 102. There is no problem even if other materials are used in combination. Furthermore, the detailed shapes of the grid structure and the prepreg material are not limited to the above embodiments.

[Structure of the Invention] As described above, according to the method for manufacturing a grid structure of the present invention, a pair of frame portions and a crosspiece portion that intersects between the two frame portions and connects the two frame portions are combined. When manufacturing a grid structure made of reinforced plastic, a first prepreg material that extends from the outer edge of one frame to the outer edge of the other frame and constitutes the crosspiece, and a first prepreg material that constitutes the frame and extends from the frame to the crosspiece. After laminating both prepreg materials in one mold with the first prepreg materials intersecting sequentially at the crosspieces, the prepreg materials are laminated in the other mold. The method of forming the grid structure by pressing and shaping the prepreg material and then hardening the prepreg material simplifies the management during manufacturing, significantly improves workability, and improves the strength of the grid structure. This has the excellent effect of improving performance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the shape and arrangement procedure of the prepreg material according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the arrangement state shown in FIG. 1 and the lamination procedure alternately performed, and FIG. is a perspective view illustrating an example of a device applicable to the manufacturing method of the present invention, FIG. 4 is a perspective view illustrating an example of a structure, and FIGS. FIG. 3 is an explanatory diagram showing the types of prepreg materials. 1... First prepreg material, 2... Second prepreg material, 101.102... Frame portion. 103... Crosspiece, G... Grid structure. Patent applicant: Patent attorney representing Nissan Motor Co., Ltd.
Yutaka Koshio C%J

Claims (1)

[Claims] (1) When manufacturing a fiber-reinforced plastic grid structure comprising a pair of frame portions and a crosspiece that intersects between the two frame portions and connects the two frame portions, from the outer edge of one frame portion to the other. A first prepreg material that reaches the outer edge of the frame and forms the crosspiece, and a second prepreg material that forms the frame and has a portion extending from the frame to the center of the crosspiece, After laminating both prepreg materials in one mold so that they intersect sequentially at the crosspiece, the prepreg material is pressed and shaped using the other mold, and then the prepreg material is subjected to a curing treatment to form a grid structure. A method for manufacturing a grid structure characterized by: