JP2009191092A - Preform for fpr member, manufacturing method thereof, and manufacturing method of frp member using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a preform for an FRP member for shaping the preform into a predetermined curved/bent form without causing any wrinkle, bent or the like, and to provide a preform and a manufacturing method of the FRP member having a predetermined curved/bent form by using the preform shaped by the manufacturing method of a preform. <P>SOLUTION: The manufacturing method of a preform includes a process A for disposing a reinforced fiber base material along with an elastically deformable mandrel, a process B for sealing the reinforced fiber base material and the mandrel in a first bag material to form a first bag structure, decompressing its inside to put the reinforced fiber base material along the shape of the mandrel for giving a predetermined cross sectional shape to the reinforced fiber base material, a process C for placing the first bag structure onto a shaping die having a predetermined curved/bent form in the longitudinal direction, and a process D for sealing the first bag structure on the shaping die in a second bag material, decompressing its inside to put the reinforced fiber base material in the first bag structure along the shape of the shaping die for giving a shape curved/bent in the longitudinal direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for shaping a preform of a FRP (fiber reinforced plastic) member before resin impregnation into a predetermined shape, a preform shaped into a predetermined shape, and a FRP member using the method. More particularly, the present invention relates to a preform for forming an FRP member that is curved or bent in the longitudinal direction, a method for manufacturing the same, and a method for manufacturing an FRP member using the method.

  When manufacturing a preform for a FRP member having a predetermined cross-sectional shape and curved or bent in the longitudinal direction, using a reinforcing fiber base composed of a laminate of reinforcing fiber materials, Reinforced between the layers because the laminate constituting the reinforcing fiber base material is bonded and integrated between the reinforcing fiber material layers at the stage of straight shape in the longitudinal direction before bending or bending in the direction The fiber materials are constrained to each other, and the formability as a whole of the laminate is reduced, and wrinkles are likely to occur at the curved and bent portions, and local bending (layer buckling) is likely to occur. There is.

  For example, as shown in FIGS. 15A and 15B, a laminate of reinforcing fiber materials having a cross-sectional shape including a flange portion 101b that is bent and extended at an end portion of the web portion 101a and extends straight in the longitudinal direction. When the reinforcing fiber base 101 made of a body is curved in the longitudinal direction as shown in FIG. 15 (C), it is particularly preferable to bend in a curved concave part to which a compressive force is applied, especially on the surface layer side of the laminated body in that part. Or local bending 102 is likely to occur.

  For example, the following method is known as a method for manufacturing the FRP member curved or bent in the longitudinal direction as described above. In Patent Document 1, in the formation of a stringer having a curved or bent shape in the longitudinal direction, a straight stringer preform is prepared in advance, and the preform is placed on a plate-like body having a curved or bent surface. A method of forming the preform into a curved shape or a bent shape by covering with a sealing medium and vacuuming the inside is disclosed. However, in this method, since a straight stringer preform prepared in advance is shaped into a curved or bent shape, the preform is easily wrinkled as shown in FIG. There was a problem that it was difficult, bent, and wrinkles were unavoidable. Therefore, in this prior art, as described in claim 13 of Patent Document 1, “the surface of the plate-like body has a surface displacement of 5 mm or less in the thickness direction”, the shaping is an extremely small curve or Limited to bending. For this reason, there is a problem that it is difficult to apply to shaping a relatively long object having a relatively large curvature.

  In Patent Document 2, when a beam having a bent cross section (C cross section or the like) formed on a composite plate material is formed by autoclave molding, the space surrounded by the bent cross section follows the bent cross sectional shape. A method of inserting an elastic member as a mandrel is disclosed. This mandrel is composed of a core material and a rubber covering material provided so as to cover the core material, and the core material is provided with a notch so that the mandrel can bend in the normal direction of the composite plate material. It is described that it is easy to attach to the beam, shorten the preparation time before molding, and further improve the molding quality by inserting a mandrel. However, this method does not describe a method for forming a preform having a curved or bent shape in the longitudinal direction, and the preform needs to be formed in a predetermined shape in advance. Therefore, the problems as described above for shaping the curved preform still remain.

Further, in Patent Document 3, a plurality of fiber bundles are arranged (placed) on the curved surface shape portion of the truncated cone jig so as to include at least a yarn layer arranged in parallel with the end portion of the truncated cone, and the yarn in the thickness direction is arranged. After forming a three-dimensional fiber structure in the shape of a truncated cone by using a curved plate-like laminate obtained by cutting in a direction perpendicular to the circumferential direction of the truncated cone and developing it A method of disposing reinforcing fiber bundles in a direction parallel to the circumferential direction of the curve by forming a stringer preform curved in the longitudinal direction is disclosed. In this manner, a curved preform is formed by previously producing a three-dimensional fiber structure having a circumference difference due to the difference in curvature between the upper flange portion and the lower flange portion. However, this method requires a truncated cone jig having a large number of pins on its surface, and it is necessary to prepare a laminate by hanging a reinforcing fiber bundle on the pins of the jig, which is usually industrially available. Since the cloth-like woven base material cannot be used as it is, there is a problem that it takes a lot of labor and time at the stage of producing the laminate.
Japanese Unexamined Patent Publication No. 2007-8147 Japanese Patent Laid-Open No. 5-116162 JP 2005-97759 A

  Therefore, in view of the limitations in the prior art as described above, the problem of the present invention is that even when the preform before resin impregnation of the FRP member curved or bent in the longitudinal direction has a relatively large curvature. A method for manufacturing a preform for FRP member that can be easily and reliably shaped into a predetermined shape without causing problems such as wrinkles and bending, and a FRP member preform that is shaped into a predetermined shape An object of the present invention is to provide a method for manufacturing a member made of FRP having a predetermined curved or bent shape by using a reform and a preform shaped by the method.

In order to solve the above-mentioned problems, the method for manufacturing a preform for FRP member according to the present invention, when manufacturing a preform before resin impregnation of an FRP member curved or bent in the longitudinal direction,
A step of arranging a dry reinforcing fiber base composed of a laminate of reinforcing fiber materials extending in the longitudinal direction along an elastically deformable mandrel, and
A first bag structure is formed by sealing the reinforcing fiber base and the mandrel with a first bag material, and the inner side of the reinforcing fiber base is reduced in pressure so that the reinforcing fiber base conforms to the shape of the mandrel. Step B for shaping into a surface shape;
Disposing the first bag structure on a shaping mold having a predetermined curved or bent shape in the longitudinal direction; and
The first bag structure on the shaping mold is sealed with a second bag material, and the inside of the second bag material is depressurized, so that the reinforcing fiber base in the first bag structure is shaped into the shape of the shaping mold. A process D for forming a curved or bent shape along the longitudinal direction along the direction D;
It consists of the method characterized by having.

  In such a method, first, a dry reinforcing fiber base material that is not bonded and fixed between reinforcing fiber materials of the laminate is sealed with a first bag material using a mandrel, and the inside is decompressed to form a predetermined cross-sectional shape. (Steps A and B), but at this stage, since it is not bent or bent in the longitudinal direction, the problem of wrinkles and bending as described above does not occur even in a laminated body. And the 1st bag structure which sealed the reinforcing fiber base material and mandrel of predetermined cross-sectional shape with the 1st bag material is arrange | positioned on the shaping type | mold which has a predetermined curve or bending shape in a longitudinal direction, and is 2nd bag By sealing with a material and depressurizing the inside, the reinforcing fiber base together with the first bag structure is shaped into a shape curved or bent in the longitudinal direction along the shape of the shaping mold (steps C and D). ). Since the reinforcing fiber base is composed of a dry base material, when bending or bending in Step D, the reinforcing fiber base can be appropriately displaced between the reinforcing fiber bases of the reinforcing fiber base to be shaped, and the shapeability Is maintained well, and the occurrence of wrinkles and bending is prevented. Further, since the entire first bag structure is curved or bent, the reinforcing fiber base in the first bag structure is curved in the longitudinal direction while being maintained in the predetermined cross-sectional shape formed in step B. As a result, the entire shape is finally formed into a target predetermined shape without causing a problem.

  In the method for producing a preform for FRP member according to the present invention, the step having the step E of pre-forming the reinforcing fiber base disposed in the step A along the shape of the mandrel before the step B. It can be. In step B, the reinforcing fiber base material is pressed against the mandrel by the shrinkage of the first bag material due to the decompression of the inside of the first bag material, and the reinforcing fiber base material made of a laminate of reinforcing fiber materials is compacted to some extent. Will be shaped into a predetermined cross-sectional shape, but by having the pre-shaped step E as described above, shaping to the predetermined cross-sectional shape in step B is more reliable and highly accurate Will be done.

  Further, in the step B, a pressing plate capable of pressing the reinforcing fiber base toward the mandrel by contraction of the first bag material due to the decompression inside the first bag material can be disposed in the first bag material. . By arranging such a pressing plate, shaping to a predetermined cross-sectional shape in the step B is performed more reliably and with high accuracy. In particular, as shown in FIGS. 5 and 6 to be described later, it is preferable to arrange the pressing plate on the upper part of the flange portion where wrinkles are likely to occur, since wrinkles can be suppressed. Since this pressing plate remains as it is in the first bag structure until the process D, the pressing plate can be deformed together with the reinforcing fiber base along with the shaping of the reinforcing fiber base in the process D. It is preferable to consist of a member.

  In Step D, the degree of vacuum in the first bag material is preferably lower than the degree of vacuum in the second bag material. For example, the inside of the first bag material is decompressed by weakening the vacuum suction to some extent, and the inside of the second bag material is decompressed by full vacuum suction. In this way, when the reinforcing fiber base in the first bag structure is bent or bent, the compaction force of the reinforcing fiber base by the first bag material is weakened to some extent, so The second bag by pressure reduction by full vacuum suction inside the second bag material can prevent the occurrence of wrinkles and bends at the time of shaping more reliably by allowing a slight interlayer displacement. It can be executed reliably by the contraction force of the material.

  However, after the process D or at the final stage of the process D, the degree of vacuum in the first bag material in the process D is further increased, and the pressing force due to the contraction of the first bag material due to the reduced pressure inside the first bag material is applied. It is preferable to have the process F which raises more. For example, as described above, in the process D, the inside of the first bag material is depressurized by weakening the vacuum suction to some extent, and after the process D or at the final stage of the process D, the inside of the first bag material is replaced with the second bag material. Similarly, the pressure is reduced by full vacuum suction. That is, at the stage where the process D is substantially finished, the shaping of the reinforcing fiber substrate into the predetermined curved or bent shape is completed, but in order to make the shaping shape more reliable, the reinforcing fiber base The compaction process (that is, pressurization) is performed on the material by the contraction force of the strengthened first bag material.

  Further, in order to more reliably maintain the final shaped shape of the reinforcing fiber substrate including the predetermined curved or bent shaped shape, the shaped reinforcing fiber base is formed after the step D or at the final stage of the step D. It is also preferable to have the process G which heats a material. That is, it is fixed to a predetermined shape by a kind of heat treatment.

  Moreover, as a reinforcing fiber base material in the present invention, a form in which reinforcing fiber yarns are formed using reinforcing fiber materials arranged in parallel in one direction can be employed. By using the reinforcing fiber material in which such reinforcing fiber yarns are arranged in parallel in one direction, it is possible to improve the mechanical characteristics in a specific direction for the FRP member to be finally formed. On the other hand, in the present invention, it is naturally possible to use a woven material in which reinforcing fibers such as a cloth material are woven in two axes. However, cloth materials and the like originally have higher shaping performance than unidirectional reinforcing fiber materials, but their mechanical properties in a specific direction are inferior. In this respect, the present invention has a great feature in that a unidirectional reinforcing fiber material capable of expressing particularly high mechanical properties is used, and a frame portion having a curvature and a bend in the longitudinal direction can be favorably shaped.

  As described above, the reinforcing fiber base formed using the reinforcing fiber material in which the reinforcing fiber yarns are arranged in parallel in one direction includes a base material including a reinforcing fiber yarn having an orientation angle of 0 degrees with respect to the longitudinal direction. For example, a cloth-like substrate including reinforcing fiber yarns having an orientation angle of 0 degree can be used. Here, “the orientation angle of the reinforcing fiber yarn with respect to the longitudinal direction is 0 degree” means not only that having an orientation of 0 degree, but also including an orientation part of 0 degree, for example, on both sides of the orientation part of 0 degree. An orientation part having an angle slightly deviating from 0 degree may be included. Further, it is a concept including a laminate or a combination of a reinforcing fiber material including a reinforcing fiber yarn having 0 degree orientation and a reinforcing fiber material including a reinforcing fiber yarn having an orientation angle other than that. By using such a reinforcing fiber base material containing a 0-degree-oriented reinforcing fiber yarn, it is possible to improve the mechanical properties, particularly in the longitudinal direction, and to easily form a predetermined cross-sectional shape. It is also possible to make it easier. For example, after forming in a predetermined cross-sectional shape (for example, a cross-sectional shape having a Z-shaped bent portion) in Step B, the shape may be curved or bent in the longitudinal direction in Step D. It becomes possible to arrange | position the said 0 degree orientation reinforcement | strengthening fiber yarn along the circumferential direction. Therefore, a process of preparing a specific reinforcing fiber base in advance by arranging the reinforcing fiber yarn bundle on a special jig as in the above-mentioned Patent Document 3 is completely unnecessary, and a cloth-like base, for example, The cloth-like base material can be used as it is as the reinforcing fiber base material used in the method of the present invention, and a desired preform can be produced at low cost.

  With respect to the reinforcing fiber base before being formed into a predetermined cross-sectional shape including the reinforcing fiber material in which such reinforcing fiber yarns are arranged in parallel in one direction, it is predetermined in a direction transverse to the longitudinal direction. It is also possible to adopt a form that includes a reinforcing fiber material in which the reinforcing fiber yarns are not bound into a cloth shape and are in a divided state at the site. By providing such a segmented portion, shaping into a predetermined cross-sectional shape is facilitated, and when shaping into a shape that is curved or bent in the final longitudinal direction, It is possible to suppress the generation of the film and reliably form the desired shape. That is, when shaping into a curved or bent shape, the shapeability can be improved by making the 0-degree-oriented reinforcing fiber yarns constituting the 0-degree-oriented reinforcing fiber material easier to move with respect to each other. Become. In this respect, when the reinforcing fiber yarns are bound not only by the weft yarn for binding but also by the resin material attached to the surface of the reinforcing fiber material, It is preferable that the reinforcing fiber material is divided in parallel with the 0-degree orientation direction so that the binding can also be divided.

  The predetermined cross-sectional region that is in the divided state can include a region that should become a bent cross-sectional region when the reinforcing fiber base is shaped into a predetermined cross-sectional shape. Moreover, you may provide the site | part made into the divided state in which the above reinforced fiber yarns are not bound as needed also with respect to the cross-sectional site | part which is not bent.

  Moreover, the reinforcing fiber base material in the present invention can also be composed of a laminate of reinforcing fiber materials having resin particles on the surface. Unlike the matrix resin of the FRP member, these resin particles are for partially temporarily bonding the reinforcing fiber materials of the reinforcing fiber base. Moreover, it is also possible to use the resin particle arrange | positioned on the surface of a reinforced fiber base material for adhesion | attachment for the objective of carrying out the interlayer reinforcement of FRP after shaping | molding. Therefore, thermoplastic resin particles or the like can be used for the resin particles. By providing a laminate structure of reinforcing fiber materials having resin particles on the surface, handling of the reinforcing fiber substrate can be facilitated without impairing the formability of the entire reinforcing fiber substrate. Moreover, it can contribute also to maintenance of the final shaping shape of a reinforced fiber base material by the pressurization and heat processing in the last stage of the above-mentioned process D or process D.

  These resin particles preferably have good adhesion to the matrix resin after curing, and examples of the resin species include polyamide, polyimide, polyamideimide, polyetherimide, polyethersulfone, polyetheretherketone, and modifications thereof. Examples thereof include resins and copolymer resins.

  As described above, the reinforcing fiber base material used in the present invention is a form in which the layers of the reinforcing fiber material are partly bonded and integrated so as to be easy to handle as a laminated body within a range that does not impair the cross-sectional shape and curved shape. It may be.

  The shape retention of the preform can be improved by bonding the layers of the laminate over the entire surface by the pressurization and heat treatment in the final stage of the process D. Furthermore, by controlling the pressurization and heating, it is possible to reduce the thickness of the laminate and control the thickness by pressurizing the resin particles in a softened state. By controlling the thickness of the preform, the thickness of the FRP member can also be controlled.

  The reinforcing fiber type of the reinforcing fiber base used in the present invention is not particularly limited, but typically, a base material including carbon fiber can be used, and a base material of a hybrid configuration including carbon fiber and other reinforcing fibers can also be used. It is. In particular, since carbon fibers are stiff, the use of a base material containing carbon fibers is suitable for the method of the present invention that can prevent the occurrence of wrinkles and bending.

  Further, as the mandrel used in the present invention, the reinforcing fiber base can be shaped into a predetermined cross-sectional shape in Step B, and can be bent or bent in the longitudinal direction together with the reinforcing fiber base by elastic deformation in Step D. Although it will not specifically limit if it is a thing, The thing extended continuously over the full length of the reinforcing fiber base material in the longitudinal direction is preferable. By using such a mandrel, in step D, the reinforcing fiber base can be bent or bent more smoothly without a break in the longitudinal direction. In addition, the mandrel can function so as to maintain a predetermined cross-sectional shape in each part over the entire length of the reinforcing fiber base during the bending or bending shaping in the process D.

  Further, the cross-sectional shape of the reinforcing fiber base formed in the step B is not particularly limited. For example, the reinforcing fiber base is aligned with the shape of the mandrel at the web portion and the end of the web portion. It can be shaped into a cross-sectional shape having a flange portion that bends and extends. As such a cross-sectional shape, for example, an L-shaped cross-sectional shape, a C-shaped cross-sectional shape in which the flange portion bends and extends in the same direction at both ends of the web portion, and a flange portion at both ends of the web portion. Examples thereof include a Z-shaped cross-sectional shape that bends and extends in opposite directions. Furthermore, it is possible to adopt an arcuate cross-sectional shape. The material of the mandrel is not particularly limited, but silicon rubber is preferable from the viewpoint that it can be shaped into a predetermined cross-sectional shape, can be deformed into a curved shape, and has heat resistance against heat treatment. Further, when the mandrel is used also in the matrix resin injection step in the subsequent step, it preferably has resin resistance characteristics.

  In the case of shaping into a cross-sectional shape having a web portion and a flange portion as described above, the reinforcing fiber base is a slit (notch) extending in a direction intersecting the longitudinal direction at the portion shaped into the flange portion. ) Is preferable. When such slits exist, especially when bending or bending in the longitudinal direction, the force that causes wrinkles and bending at the slits is released, so generation of wrinkles and bending is prevented. This can be prevented more reliably and efficiently. A plurality of slits are preferably arranged in the longitudinal direction as necessary. In addition, the slit preferably extends across both sides of the bent portion in the cross-sectional shape in the cross-sectional direction, but it does not necessarily have to be formed in such an extended shape.

  The preform for an FRP member according to the present invention is a preform before resin impregnation of an FRP member that is curved or bent in the longitudinal direction, and the reinforcing fiber base that forms the preform is a reinforcing fiber yarn The reinforcing fiber yarns are formed using reinforcing fiber materials arranged in parallel in one direction, and the reinforcing fiber yarns are bent or bent in the longitudinal direction at an angle of 0 degrees with respect to the longitudinal direction of the FRP member. It consists of what is characterized by including the reinforced fiber material orientated. The concept of the 0 degree orientation of the reinforcing fiber yarn is as described above.

  In this FRP member preform, a form having a cross-sectional shape having a web portion and a flange portion that bends and extends at the end portion of the web portion can be employed. In this case, it is preferable that the height of the ridge in either the web portion or the flange portion is 0.5 mm or less. The height of the ridge can be measured, for example, as follows. When a metal scale is applied to the top of the ridge where the height of the web or flange is the highest, the gap between the surface of the web without flange or the surface of the flange and the scale should be the height of the ridge. Can do.

  Such a preform for FRP member according to the present invention can be formed into a desired shape by the method for manufacturing a preform for FRP member as described above.

  The method for producing an FRP member according to the present invention comprises a method in which a preform shaped by the method for producing an FRP member preform as described above is impregnated with a matrix resin and cured. As the resin impregnation curing method, for example, a so-called RTM (Resin Transfer Molding) molding method can be adopted. Also, vacuum assisted RTM (VaRTM) molding method using vacuum pressure can be adopted. VaRTM is more preferable because it does not require a pressurizing device and can be molded easily.

  Further, in the manufacture of such an FRP member, a matrix resin is placed in a state in which a rigid plate having a predetermined shape is disposed, for example, at least on the web portion of at least one portion of the shaped preform. Can be impregnated. It is preferable to arrange such a rigid plate because the surface smoothness of the FRP member can be improved and the meandering of the fibers can be improved. In particular, small wrinkles, fiber undulations, etc. that occur during shaping can be molded by pressing the rigid plate so that the matrix resin can be cured and molded while the wrinkles and undulations are compressed. The thickness can be reduced.

  According to the FRP member preform according to the present invention and the manufacturing method thereof, the preform having a predetermined cross-sectional shape and a predetermined curve or bent in the longitudinal direction can be generated without causing wrinkles or bending. It can be shaped easily, accurately, reliably and inexpensively. If an FRP member is manufactured using this preform, an FRP member having a target curved or bent shape can be efficiently manufactured.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of the shape of a preform before resin impregnation to be manufactured by the method for manufacturing a preform for FRP member according to an embodiment of the present invention (the present invention is used with this preform). The FRP member to be manufactured by the FRP member manufacturing method is also exemplified as an equivalent shape). The preform 1 after shaping shown in FIG. 1 is composed of a web portion 2 and flange portions 3 and 4 extending in opposite directions on both sides of the web portion 2 and extending in the longitudinal direction XX. Is shaped into a curved and extending shape. In the present invention, such a cross-sectional shape is referred to as a Z-shaped cross-sectional shape, and the Z-shaped cross-sectional shape includes those in which the bending angle of the flange portions 3 and 4 from the web portion 2 is other than 90 degrees. This is a concept that includes those in which the bending angles of the flange portions 3 and 4 with respect to the portion 2 are different from each other. Also, the sizes of the flange portions 3 and 4 may be the same or different from each other. As described above, in the present invention, an L-shaped cross-sectional shape, a C-shaped cross-sectional shape in which the flange portions bend and extend in the same direction at both ends of the web portion, an arc-shaped cross-sectional shape, etc. are adopted. Is also possible.

  The FRP member preform 1 having the Z-shaped cross-sectional shape and curved in the longitudinal direction XX is manufactured, for example, as shown in FIGS. First, as shown in FIG. 2, a mandrel capable of elastically deforming a dry reinforcing fiber substrate 12 made of a laminate of reinforcing fiber materials 11 extending in the longitudinal direction XX (direction perpendicular to the paper surface of FIG. 2). 13 (step A). The mandrel 13 extends continuously over the entire length of the reinforcing fiber base 12 in the longitudinal direction XX. What is necessary is just to set suitably the cross-sectional shape of this mandrel 13, a number, and a relative arrangement position suitably according to the cross-sectional shape of the reinforced fiber base material 12 to shape. Further, the corner portion of the mandrel 13 may be R-processed into a shape corresponding to the cross-sectional shape (not shown).

  Next, in this embodiment, as shown in FIG. 3, the reinforcing fiber base 12 is pre-shaped along the shape of the mandrel 13 (step E). In this pre-shaping, the both sides of the cross section of the reinforcing fiber base 12 may be bent and bent along the outer surface of each mandrel 13. At this stage, a Z-shaped cross section having a web portion 2 and flange portions 3 and 4 as shown in FIG. 1 is formed. Further, at this stage, as shown in FIG. 4, both the reinforcing fiber base 12 and the mandrel 13 extend straight in the longitudinal direction XX. At the stage of extending in this straight shape, the height of the Z-shaped cross-sectional shape may vary depending on the site in the longitudinal direction XX.

  Next, as shown in FIG. 5, the first bag structure 15 is formed by sealing the reinforcing fiber base 12 and the mandrel 13 with the first bagging film 14 as the first bag material, and the inside is vacuumed. By reducing the pressure (vacuum degree [vacuum pressure] V1) by vacuum suction using a pump or the like, the reinforcing fiber substrate 12 is pressed against the mandrel 13 by the contraction of the first bagging film 14 accompanying the reduced pressure, and the reinforcing fiber substrate 12 is A predetermined cross-sectional shape (Z-shaped cross-sectional shape) is formed along the shape of the mandrel 13 (step B). At the time of this shaping, in this embodiment, a pressing plate 16 capable of pressing the reinforcing fiber base 12 toward the mandrel 13 by contraction of the first bagging film 14 is disposed. In the present embodiment, the pressing plate 16 is disposed only at the portion corresponding to the flange portion 3, but it can be provided at the portion corresponding to the flange portion 4 and other portions. The pressing plate 16 is made of a member that can be deformed along with the shaping of the reinforcing fiber base 12 in Step D described later.

  Next, as shown in FIG. 6 (A), the first bag structure 15 is placed on a shaping die 17 having a predetermined curved or bent shape in the longitudinal direction XX (step C), The first bag structure 15 on the mold 17 is sealed with the second bagging film 18 as the second bag material using the sealing material 19 (the first stage of the process D). At this time, the reinforcing fiber base material 12, the mandrel 13, and the pressing plate 16 inside the first bag structure 15 are, as shown in FIG. 6B, the cross-sectional shape and state after the process B shown in FIG. It is kept in.

  Next, as shown in FIG. 7A, the inside of the second bagging film 18 in which the first bag structure 15 is sealed is depressurized (vacuum degree [vacuum pressure] V2) by vacuum suction using a vacuum pump or the like. Thus, the reinforcing fiber base 12 in the first bag structure 15 is shaped into a shape curved in the longitudinal direction XX along the shape of the shaping die 17 (after stage D). At this time, the cross-sectional shapes of the reinforcing fiber base 12, the mandrel 13, and the pressing plate 16 inside the first bag structure 15 are substantially maintained as they are as shown in FIG. 7B. I'm leaning. However, when the compaction process described below is performed, the reinforcing fiber base 12 is somewhat reduced in the thickness direction. In this step D, for example, as shown in FIG. 8, the reinforcing fiber base 12 is curved in the longitudinal direction XX together with the mandrel 13 and shaped into a predetermined curved shape.

  In this step D, the degree of vacuum V1 in the first bagging film 14 is preferably lower than the degree of vacuum V2 in the second bagging film 18. This prevents the reinforcing fiber base 12 in the first bagging film 14 from being over-tightened with the first bagging film 14 and maintains the good shapeability of the reinforcing fiber base 12 while maintaining the second bagging. This is because the reinforcing fiber base 12 in the first bag structure 15 is smoothly shaped into a predetermined curved shape by the film 18. In the case of vacuum suction, the first bagging film 14 may be vacuum-sucked so as to weaken the degree of vacuum V1 to some extent, and the second bagging film 18 may be sucked full vacuum.

  However, since it is desirable to fix the reinforcing fiber base 12 to the predetermined curved shape at the stage where the shaping into the predetermined curved shape is completed or almost completed, after the step D or In the final stage of the process D, the degree of vacuum V1 in the first bagging film 14 in the process D is further increased (for example, the degree of vacuum V1 is further increased by setting full vacuum suction to the inside of the first bagging film 14). ), A step F for further increasing the pressing force due to the shrinkage of the first bagging film 14 accompanying the decompression of the inside of the first bagging film 14, that is, a step F for performing the compaction treatment of the reinforcing fiber base 12 is preferable. . By this process F, a compaction process is performed on the reinforcing fiber base material 12 that has been shaped into a predetermined cross-sectional shape and a curved shape, and the final target shape as a preform is maintained.

  Moreover, in order to keep the final shaping shape of the reinforcing fiber base 12 shaped into a predetermined shape as described above more reliably, the reinforcement formed after the process D or at the final stage of the process D. It is preferable to have the process G which heats the fiber base material 12. FIG. This makes it possible to thermally fix the shape.

  In addition, as described above, the reinforcing fiber base 12 can be a laminate of reinforcing fiber materials having resin particles for temporary adhesion on the surface. In this form, in the stage before the shaping to the final shape is completed, it is possible to improve the handleability of the reinforcing fiber substrate 12 made of a laminate while maintaining good shaping properties, After the process D or at the final stage of the process D, the reinforcing fiber material is more firmly bonded between the layers using the resin particles by the pressurization and heat treatment as described above, and the final shaped shape as a preform is formed. Can be maintained.

  As described above, the reinforcing fiber substrate 12 includes a substrate including a reinforcing fiber yarn having an orientation angle of 0 degree with respect to the longitudinal direction XX, for example, a reinforcing fiber yarn having an orientation angle of 0 degree. A cloth-like substrate can be used. If such a reinforcing fiber base material is used, it is finally possible to arrange the 0 degree orientation reinforcing fiber yarn along the circumferential direction of the curved shape of the longitudinal direction XX, It becomes possible to easily use a woven fabric substrate or the like, and a preform having a desired shape can be manufactured at a low cost.

  An FRP member, for example, an FRP beam or an FRP stringer is formed using the preform 1 having a Z-shaped cross-sectional shape that has been formed into a target curved shape through the above-described steps. As described above, the RTM molding method and the VaRTM molding method can be applied to this molding. In this molding, for example, as shown in FIG. 9, a rigid plate 21 having a predetermined shape is disposed at least on the web portion in the illustrated example with respect to at least one portion of the preform 1 formed into a predetermined shape. In this state, the matrix resin can be impregnated. If such a rigid plate 21 is arranged, the FRP member can be more reliably formed into the target shape.

  FIG. 10 exemplifies a case where a reinforcing fiber substrate having a slit 32 is used in shaping a preform 31 having a predetermined Z-shaped cross-sectional shape and a curved shape in the longitudinal direction XX as described above. ing. In the illustrated example, a plurality of slits 32 (notches) extending in the direction intersecting the longitudinal direction XX are formed in the longitudinal direction XX at a portion shaped to the flange portion 33, and each slit 32 is The flange portion 33 extends to a part of the web portion 34. If such a slit 32 is provided in advance in the reinforcing fiber base, particularly when the curved shape is formed in the longitudinal direction XX, a force that causes wrinkles or bending at the slit portion is released. The occurrence of wrinkles and bends can be prevented more reliably and efficiently. In addition, the broken line in FIG. 10 has shown the orientation direction of the reinforced fiber yarn, and is orientated in the 0 degree direction with respect to the longitudinal direction XX. Also in the case of such a 0 degree orientation reinforcing fiber yarn, the presence of the slit 32 can surely prevent the occurrence of wrinkles and bending.

  In each of the embodiments described above, the case where the preforms 1 and 31 having a shape curved in the longitudinal direction XX have been described. However, the present invention provides a profile having a shape bent in the longitudinal direction XX. The case of reforming can also be applied by using a mandrel that can be deformed following bending.

  Moreover, in this invention, as mentioned above, the form which consists of a reinforced fiber material in which the reinforced fiber base material used arrange | positions the reinforced fiber yarn in parallel in one direction is employable as a preferable form. By using the unidirectionally arranged reinforcing fiber material, the mechanical properties of the FRP member can be improved. In this case, simply using a reinforcing fiber base material composed of a laminate of reinforcing fiber materials in which reinforcing fiber yarns are arranged in parallel in one direction, it is applied to a shape curved or bent in the longitudinal direction as in the present invention. If formed, large wrinkles may occur, and the mechanical properties may decrease due to bending, meandering, etc. of the fibers due to wrinkles. However, the reinforcing fiber yarns are unidirectional by the specific method according to the present invention. Even when the reinforcing fiber materials arranged in parallel with each other are used, the preform can be manufactured without generating large wrinkles.

  For example, as shown in FIG. 11, a preform 41 having a Z-shaped cross section in which an upper flange portion 43 and a lower flange portion 44 are connected to both sides of the web portion 42 and curved in the longitudinal direction XX is formed. Consider the case. For example, as shown in FIG. 12, normal reinforcing fiber yarns 51 are arranged in parallel in one direction (for example, in the direction of 0 degrees with respect to the longitudinal direction XX), and the reinforcing fiber yarns 51 are (more accurately, A reinforcing fiber material 53 in which the fiber bundles of the reinforcing fiber yarns 51 are bundled in a cloth shape with weft yarns 52 (used as a surface layer in the illustrated example), and the reinforcing fiber material having the same unidirectional orientation as that or reinforcing fiber yarns in different directions. A reinforcing fiber base material 55 is formed by laminating a plurality of reinforcing fiber materials 54 in which strips are arranged (reinforcing fiber materials 54 arranged in different directions in the illustrated example) (see FIG. 12). For the sake of simplicity, only the 0-degree layer of the surface layer of the reinforcing fiber substrate 55 made of a laminate is shown in a floating state, and each reinforcing fiber material in the reinforcing fiber substrate 55 made of the laminate is not necessarily in the thickness direction. Not united). Using the reinforcing fiber base 55 made of such a laminate, the upper flange portion equivalent portion 57 and the lower flange portion equivalent portion 58 are bent and shaped with respect to the portion 56 corresponding to the web portion 42, and the longitudinal direction X In the case of curve shaping to -X, wrinkles are likely to occur particularly in the web portion and the portion that becomes the curved concave portion in each flange portion.

  However, in the specific method according to the present invention, for example, as shown in FIG. 13, the reinforcing fiber yarns 61 are arranged in parallel in one direction (for example, in the direction of 0 degree with respect to the longitudinal direction XX), and the reinforcing fiber. The yarn 61 (more precisely, the fiber bundle of the reinforcing fiber yarn 61) uses a reinforcing fiber material 63 bound in a cloth shape with a weft thread 62 (used as a surface layer in the illustrated example), and other reinforcing fiber materials 64 and When the reinforcing fiber base 65 made of the laminate is prepared, for example, with respect to the reinforcing fiber material 63 constituting the 0-degree layer of the surface layer, the web portion equivalent portion 66 and the upper flange portion to be bent and shaped thereto Using a reinforcing fiber base material 65 made of a laminate formed at a portion 69 in a divided state that is not bound by the weft thread 62 at the boundary between the equivalent portion 67 and the lower flange portion equivalent portion 68, the web portion equivalent portion 66 is formed. For upper flange part 67 and the lower flange portion corresponding portion 68 bent shaping, further curved shaped longitudinally X-X, is preferably possible to suppress the generation of wrinkles. In addition, also in FIG. 13, in order to make it intelligible, it has illustrated in the state which floated only the 0 degree layer of the surface layer of the reinforcing fiber base material 65 which consists of a laminated body. The layers other than the 0 degree layer may be bound with weft yarn as usual.

  That is, when a reinforcing fiber substrate as described above is usually produced, the reinforcing fiber yarns in which the reinforcing fiber yarns are arranged in parallel in one direction have all the fiber bundles of the reinforcing fiber yarns in order to maintain a cloth-like form. Bundled with weft. By cutting the weft yarn, a predetermined portion in the width direction of the reinforcing fiber material can be provided with a portion where the reinforcing fiber material of 0 degree fiber orientation is cut and separated in parallel along the longitudinal direction by not binding. (Can be broken). It is preferable to form a reinforcing fiber base material obtained by laminating such a 0-degree reinforcing fiber material in a state where the reinforcing fiber material is cut and separated at a predetermined location and use it, because generation of wrinkles can be suppressed when shaped. . In the part 69 in the divided state, there is no need to open a gap between the reinforcing fiber material parts on both sides. Further, as shown in the illustrated example, the other reinforcing fiber material to be laminated may include reinforcing fiber yarns having an angle other than 0 degrees with respect to the longitudinal direction XX, and the reinforcing fiber yarns having 0 degree orientation. May be included. These other reinforcing fiber materials do not necessarily have to be cut at the dividing portion 69. In forming into a curved shape, the 45-degree layer and 90-degree layer are relatively easy to shape, but the 0-degree layer is difficult to shape, so the 0-degree layer of reinforcing fiber material is not particularly bound by weft. Having a divided state is preferable because the shapeability can be improved. It is not always necessary that all 0 degree layers have a divided state, but it is preferable that not only the surface layer but also the inserted 0 degree layer has a divided state as shown in FIGS.

  Furthermore, the above-mentioned parting part can be provided in addition to the part where the cross section is bent and shaped as necessary. For example, in the reinforcing fiber base 65 shown in FIG. 13, as shown in FIG. 14, at least one split site extending in the longitudinal direction XX is provided at the center in the width direction with respect to the web portion equivalent portion 66. It can also be set as the reinforced fiber base material 72 which has the added parting part 71. FIG. In other words, the surface portion 0-degree-oriented reinforcing fiber material 63 is laminated in a state in which the web portion corresponding portion 66 is divided into at least two divided portions parallel to the longitudinal direction. As described above, by appropriately setting the divided part, generation of wrinkles can be further suppressed.

  As described above, the present invention can perform curve shaping even when using a reinforcing fiber base made of a laminate of conventional ordinary cloth-like reinforcing fiber materials, and is unidirectional as described above. When a reinforcing fiber base made of a laminate is formed using a reinforcing fiber material and used, it has a great feature in that the generation of wrinkles can be further suppressed.

<Example 1>
A preform having a length of 1 m and having a curvature radius of R2000 mm in the longitudinal direction of the Z-shaped cross-sectional shape was produced by the following means.
The reinforcing fiber material is a unidirectional woven fabric in which T800S carbon fiber yarns manufactured by Toray Industries, Inc. are bound with weft yarns. The reinforced fiber material was cut and laminated on a laminated structure [45/0 / −45 / 90/45/0 / −45 / 90] _S to prepare a reinforced fiber base material having a width of 140 mm and a length of 450 mm. Here, the laminated structure [45/0 / −45 / 90/45/0 / −45 / 90] 45, 0, −45, 90 of _S means the lamination angle and the order when the longitudinal direction is 0 °. To do. S means a mirror surface object.

  Next, two flexible mandrels made of silicon rubber were prepared. The flexible mandrel has a cross-sectional shape of 70 mm in height, 40 mm in width, and 460 mm in length, and each corner has a rectangular parallelepiped shape subjected to R processing of R5 mm. A reinforcing fiber base material is arranged on a flexible mandrel, and the reinforcing fiber base material is shaped so as to have a Z-shaped cross-sectional shape as shown in FIG. 7B, and a nylon bagging film and sealing are used as the first bag material. After sealing with a tape, the inside of the interior was vacuumed to prepare a first bag structure.

  Next, after the first bag structure is placed on a curved surface mold having a curved surface with a radius of curvature R of 2000 mm, the first bag structure is sealed with a bagging film made of nylon as a second bag material and a sealing tape, By vacuum-sucking the inside, the first bag structure was placed along a curved surface shape, and the reinforcing fiber base was shaped into a frame shape having a Z-shaped cross-sectional shape and a curvature radius R2000 mm in the longitudinal direction. .

  The insides of the first bag material and the second bag material were both vacuum sucked, put into an oven in a state of being pressurized using atmospheric pressure, and heat-treated at a temperature of 80 ° C. for 2 hours. .

  After cooling to room temperature, the 1st bag material and the 2nd bag material were removed, and the preform was produced. As a result of preform appearance inspection, although some convex wrinkles were confirmed in the flange part on the concave side, it was confirmed that there was no large wrinkle that would cause a problem in the molded product and that it was a high-quality preform. It was.

<Example 2>
As shown in FIG. 7B, a preform was produced in the same manner as in Example 1 except that an aluminum pressing plate having a thickness of 2 mm, a width of 30 mm, and a length of 450 mm was arranged on the flange portion on the concave side of the preform. did. As a result of the appearance inspection of the preform, it was confirmed that there was no convex wrinkle in the flange portion on the concave side and that the preform was a high-quality preform.

<Example 3>
As shown in FIG. 10, the preform was formed in the same manner as in Example 2 except that the reinforcing fiber base was prepared in advance so as to have a notch (slit) extending from the flange portion of the preform to a part of the web portion. Was made. As a result of the appearance inspection of the preform, it was confirmed that there was no large wrinkle that would cause a problem in the molded product in both the flange portion and the web portion, and that the preform was a high-quality preform.

<Example 4>
As shown in FIG. 14, the web portion equivalent portion 66 of the 0-degree reinforcing fiber orientation layer constituting the reinforcing fiber base, the upper flange portion equivalent portion 67 and the F flange portion equivalent portion 68 to be bent and shaped, A preform was produced in the same manner as in Example 3 except that the boundary portion and the web portion equivalent portion 66 were laminated in a form having a divided state portion in which the weft was cut so as to be divided into four parallel to the longitudinal direction. . As a result of the appearance inspection of the preform, it was confirmed that there was no large wrinkle that would cause a problem in the molded product in both the flange portion and the web portion, and that the preform was a high quality preform.

<Example 5>
The preform produced in Example 3 was sealed with a nylon bagging film in a state where a 2 mm-thick aluminum pressing plate corresponding to the web shape was placed on both the flange portion and the web surface of the preform, and the inside was vacuumed The epoxy resin was injected by vacuuming by VaRTM molding, and was heated in an oven at 130 ° C. for 2 hours to cure the epoxy resin. After the epoxy resin was cured, it was cooled, the bagging film was removed, and the pressing material was demolded to produce a CFRP frame.

  As a result of the appearance inspection of the CFRP frame, it was confirmed that the web portion and the flange portion were free from noticeable wrinkles and had a good appearance. Moreover, as a result of measuring the volume content of reinforcing fibers at each of five locations on the web and flange surface of the frame by (4) sulfuric acid decomposition method described in JIS K7075-1991, 55.0 to 60.0% in all parts. It was confirmed that it was within the range.

<Example 6>
The preform produced in Example 4 was sealed with a nylon bagging film in a state where a 2 mm-thick aluminum pressing plate corresponding to the web shape was placed on both the flange portion and both web surfaces of the preform, and the inside was vacuumed The epoxy resin was injected by vacuuming by VaRTM molding, and was heated in an oven at 130 ° C. for 2 hours to cure the epoxy resin. After the epoxy resin was cured, it was cooled, the bagging film was removed, and the pressing material was demolded to produce a CFRP frame.

  As a result of the appearance inspection of the CFRP frame, it was confirmed that the web portion and the flange portion were free from noticeable wrinkles and had a good appearance. Moreover, as a result of measuring the volume content of reinforcing fibers at each of five locations on the web and flange surface of the frame by (4) sulfuric acid decomposition method described in JIS K7075-1991, 55.0 to 60.0% in all parts. It was confirmed that it was within the range.

<Comparative Example 1>
Using the aluminum mandrel having the same shape as that of the flexible mandrel used in Example 1, the first bag structure was prepared in the same manner as in Example 1 and placed in the oven as it was, and the heat treatment was performed at a temperature of 80 ° C. for 2 hours. Thus, a straight preform having a Z-shaped cross-sectional shape was produced.

  This straight preform is placed on the curved surface mold used in Example 1, the preform is sealed with a nylon bagging film, and the inside of the oven is vacuumed to fit the curved mold in the oven. Was subjected to heat treatment at 80 ° C. for 2 hours to prepare a preform. As a result of the appearance inspection of the preform, a large number of large wrinkles were confirmed on both flanges and the web portion at the center in the longitudinal direction of the preform.

<Comparative Example 2>
Similar to Comparative Example 1, a straight preform having a Z-shaped cross-sectional shape was produced, and the flexible mandrel used in Example 1 was placed on the preform, and the curved surface type used in Example 1 was used. Placed on top, sealed both preform and flexible mandrel with nylon bagging film, vacuumed inside, heated in an oven at a temperature of 80 ° C for 2 hours in a curved shape Processing was performed to prepare a preform. As a result of the appearance inspection of the preform, a large number of large wrinkles were confirmed on both flanges and the web portion at the center in the longitudinal direction of the preform.

  The FRP member preform according to the present invention, the manufacturing method thereof, and the FRP member manufacturing method using the method are manufactured by bending or bending the FRP member in the longitudinal direction and the preform before resin impregnation. It is applicable to all uses that are required to be performed.

It is a perspective view which shows the example of the shape of the preform before resin impregnation which should be manufactured with the manufacturing method of the preform for FRP members which concerns on one embodiment of this invention. It is a schematic cross-sectional view which shows one step for manufacturing the preform for FRP members of FIG. FIG. 3 is a schematic cross-sectional view showing a next step of FIG. 2. It is a schematic perspective view of each member in the step of FIG. FIG. 4 is a schematic cross-sectional view showing the next step of FIG. 3. FIG. 6 is a schematic longitudinal sectional view (FIG. 6 (A)) showing a next step of FIG. 5 and a schematic enlarged cross sectional view (FIG. 6 (B)) along the line AA in FIG. 6 (A). FIG. 7 is a schematic longitudinal sectional view (FIG. 7A) showing a next step of FIG. 6 and a schematic enlarged cross sectional view (FIG. 7B) taken along the line A′-A ′ of FIG. 7A. It is a schematic perspective view of each member in the step of FIG. It is a schematic cross-sectional view which shows the example of each member arrangement | positioning in shaping | molding of the member made from FRP. It is a perspective view which shows the example of a shape of the preform before resin impregnation which should be manufactured with the manufacturing method of the preform for FRP members which concerns on another embodiment of this invention. It is a perspective view which shows an example of the preform which is going to shape. It is a perspective view which shows an example of the reinforced fiber base material used for shaping of the preform of FIG. It is a perspective view which shows an example of the preferable form of the reinforced fiber base material used for shaping of the preform of FIG. It is a perspective view which shows an example of another preferable form of the reinforced fiber base material used for shaping of the preform of FIG. It is a figure for showing the problem in the preform shaping in a prior art, (A) is a cross-sectional view of the reinforcement fiber base before curve shaping, (B) is a side view, (C) is curve shaping. It is a side view of the reinforced fiber base material at the time of shaping.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 31 Preform 2, 34 Web part 3, 4, 33 Flange part 11 Reinforcement fiber material 12 Reinforcement fiber base material 13 Mandrel 14 First bagging film 15 as the first bag material First bag structure 16 Pressing plate 17 Shaped mold 18 Second bagging film 19 as second bag material Seal material 21 Rigid plate 32 Slit 41 Preform to be shaped 42 Web portion 43 Upper flange portion 44 Lower flange portion 51, 61 Reinforced fiber yarn 52 62 Weft yarns 53, 63 Unidirectional reinforcing fiber materials 54, 64 Other reinforcing fiber materials 55, 65, 72 Reinforcing fiber base materials 56, 66 Web portion equivalent portions 57, 67 Upper flange portion equivalent portions 58, 68 Lower flange portion equivalent Portions 69, 71 Split site XX Longitudinal direction

Claims (22)

When manufacturing a preform before resin impregnation of an FRP member curved or bent in the longitudinal direction,
A step of arranging a dry reinforcing fiber base composed of a laminate of reinforcing fiber materials extending in the longitudinal direction along an elastically deformable mandrel, and
A first bag structure is formed by sealing the reinforcing fiber base and the mandrel with a first bag material, and the inner side of the reinforcing fiber base is reduced in pressure so that the reinforcing fiber base conforms to the shape of the mandrel. Step B for shaping into a surface shape;
Disposing the first bag structure on a shaping mold having a predetermined curved or bent shape in the longitudinal direction; and
The first bag structure on the shaping mold is sealed with a second bag material, and the inside of the second bag material is depressurized, so that the reinforcing fiber base in the first bag structure is shaped into the shape of the shaping mold. A process D for forming a curved or bent shape along the longitudinal direction along the direction D;
The manufacturing method of the preform for FRP members characterized by having.   The manufacturing method of the preform for FRP members of Claim 1 which has the process E which pre-shapes the reinforcement fiber base material arrange | positioned at the process A along the shape of a mandrel before the process B.   In the step B, a pressing plate capable of pressing the reinforcing fiber base toward the mandrel due to contraction of the first bag material accompanying decompression inside the first bag material is disposed in the first bag material. A method for producing a preform for a member made of FRP according to 1 or 2.   The manufacturing method of the preform for FRP members of Claim 3 which the said press board consists of a member which can deform | transform with the shaping of the said reinforced fiber base material in the process D.   The manufacturing method of the preform for FRP members according to any one of claims 1 to 4, wherein in step D, the degree of vacuum in the first bag material is lower than the degree of vacuum in the second bag material.   After the process D or at the final stage of the process D, the degree of vacuum in the first bag material in the process D is further increased, and the pressing force due to the contraction of the first bag material due to the reduced pressure inside the first bag material is further increased. The manufacturing method of the preform for FRP members in any one of Claims 1-5 which has the process F.   The manufacturing method of the preform for FRP members in any one of Claims 1-6 which has the process G which heats the shaped reinforcing fiber base material after the process D or the final stage of the process D.   The manufacturing method of the preform for FRP members according to any one of claims 1 to 7, wherein the reinforcing fiber base is formed using a reinforcing fiber material in which reinforcing fiber yarns are arranged in parallel in one direction. .   The manufacturing method of the preform for FRP members in any one of Claims 1-8 in which the said reinforced fiber base material consists of a base material containing the reinforced fiber yarn whose orientation angle with respect to a longitudinal direction is 0 degree | times.   The reinforcing fiber base before being shaped into a predetermined cross-sectional shape is in a divided state without the reinforcing fiber yarns being bound into a cloth shape at a predetermined portion in a direction transverse to the longitudinal direction. The manufacturing method of the preform for FRP members of Claim 8 or 9 which contains the reinforcing fiber material which is.   The preform for FRP member according to claim 10, wherein the predetermined part includes a part that should become a bent cross-sectional part when the reinforcing fiber base is shaped into a predetermined cross-sectional shape. Production method.   The manufacturing method of the preform for FRP members in any one of Claims 1-11 which the said reinforced fiber base material consists of a laminated body of the reinforced fiber material which has a resin particle on the surface.   The manufacturing method of the preform for FRP members in any one of Claims 1-12 in which the said reinforced fiber base material consists of a base material containing carbon fiber.   The manufacturing method of the preform for FRP members in any one of Claims 1-13 with which the said mandrel is continuously extended over the full length of the said reinforced fiber base material in the longitudinal direction.   The reinforcing fiber base is shaped into a cross-sectional shape having a web portion and a flange portion that extends and bends at an end portion of the web portion along the shape of the mandrel. The manufacturing method of the preform for FRP-made members of description.   The manufacturing method of the preform for FRP members according to claim 15, wherein the reinforcing fiber base has a slit extending in a direction intersecting with a longitudinal direction at a portion shaped to the flange portion.   A preform before resin impregnation of an FRP member that is curved or bent in the longitudinal direction, and the reinforcing fiber base that forms the preform is a reinforcing fiber material in which reinforcing fiber yarns are arranged in parallel in one direction And the reinforcing fiber yarn includes a reinforcing fiber material oriented at an angle of 0 degrees with respect to the longitudinal direction of the FRP member curved or bent in the longitudinal direction. A preform for FRP members.   The preform for an FRP member according to claim 17, having a cross-sectional shape having a web portion and a flange portion that bends and extends at an end portion of the web portion.   The preform for FRP members according to claim 18, wherein the height of the ridge at any of the web portion and the flange portion is 0.5 mm or less.   The preform for FRP members according to any one of claims 17 to 19, which is formed by the method according to any one of claims 1 to 16.   The manufacturing method of the member made from FRP which makes the preform shape | molded by the method in any one of Claims 1-16 impregnate a matrix resin, and is hardened.   The method for producing an FRP member according to claim 21, wherein the matrix resin is impregnated in a state in which a rigid plate is disposed on at least one portion of the shaped preform.

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