JP2017132083A - Method for manufacturing fiber-reinforced resin structure and fiber-reinforced resin structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a fiber-reinforced resin structure capable of improving rigidity and strength of a hole part provided on a structure made from a fiber-reinforced resin, and to provide a fiber-reinforced resin structure.SOLUTION: There is provided a method for manufacturing a fiber-reinforced resin structure for manufacturing a fiber-reinforced resin structure by curing a fiber-reinforced resin laminate where a plurality of fiber-reinforced resin sheets having a reinforced fiber impregnated with a matrix resin are laminated which includes: a lamination step of laminating the plurality of fiber-reinforced resin sheets to produce a fiber-reinforced resin laminate; a forming step of curing the fiber-reinforced resin laminate to form a fiber-reinforced resin structure; and a hole opening step of hole opening the fiber-reinforced resin structure to form a hole part, where in the lamination step, a continuous fiber-reinforced sheet having a continuous fiber aligned in one direction impregnated with a matrix resin is arranged along the periphery of a portion corresponding to the hole part.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for producing a fiber reinforced resin structure and a fiber reinforced resin structure.

  In recent years, a three-dimensional structural member made of a fiber reinforced resin such as carbon fiber reinforced resin (CFRP) is being used as a structural member constituting a structural body such as an automobile body. The structural member made of fiber reinforced resin can reduce the weight of the structural member as compared with the metallic structural member. A structure made of a fiber reinforced resin is obtained by, for example, heating and pressing a fiber reinforced resin laminate obtained by laminating a fiber reinforced resin sheet obtained by impregnating a reinforced fiber with a thermosetting matrix resin using an autoclave apparatus, Is produced by curing.

  Here, the structural member may be provided with a hole into which a connector or the like is inserted. For example, Patent Document 1 discloses a resin arm made of a fiber reinforced resin in which a joint device mounting portion is provided at an axial end portion. The shaft portion of such a resin arm is manufactured by cutting a long material obtained by a continuous drawing method using a molten resin material containing long fibers as reinforcing fibers, for example, to an appropriate length. In addition, the cylindrical portion as the mounting portion of the resin arm is manufactured, for example, by filling a molten resin material containing short fibers as reinforcing fibers into a molding cavity formed by a molding die and cooling and solidifying. The

Japanese Patent Laid-Open No. 10-272707

  However, although the resin arm described in Patent Document 1 is manufactured using a fiber reinforced resin, the cylindrical portion is formed of a molten resin material containing short fibers, like a suspension arm. For parts that require high rigidity and strength, rigidity and strength are not sufficient.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is a novel and improved technique capable of improving the rigidity and strength of the hole provided in the structure made of fiber reinforced resin. Another object of the present invention is to provide a method for producing a fiber-reinforced resin structure and a fiber-reinforced resin structure.

  In order to solve the above problems, according to one aspect of the present invention, a fiber reinforced resin structure obtained by curing a fiber reinforced resin laminate in which a plurality of fiber reinforced resin sheets impregnated with reinforced fibers with a matrix resin is cured is obtained. A manufacturing method of a fiber reinforced resin structure to be manufactured, a lamination step of stacking a plurality of fiber reinforced resin sheets to produce a fiber reinforced resin laminate, and a fiber reinforced resin structure by curing the fiber reinforced resin laminate In the laminating process, continuous fibers oriented in one direction are impregnated with a matrix resin. The molding process includes molding a molding process for molding a fiber reinforced resin structure, and drilling a fiber reinforced resin structure. There is provided a method for producing a fiber reinforced resin structure in which a continuous fiber reinforced sheet is disposed along the periphery of a portion corresponding to a hole.

  A continuous fiber reinforced sheet may be laminated between fiber reinforced resin sheets.

  When a plurality of continuous fiber reinforcing sheets are arranged, the positions of all or some of the plurality of continuous fiber reinforcing sheets may be shifted.

  You may further provide the process of arrange | positioning a cylindrical member in a hole.

  In order to solve the above problems, according to another aspect of the present invention, a main body formed using a fiber reinforced resin and a hole provided in the main body are provided, and the periphery of the hole A fiber reinforced resin structure is provided in which continuous fibers are arranged along the line.

  The main body is formed by joining the first half and the second half, and the hole is provided through the first half and the second half. And a continuous fiber may be arrange | positioned along the circumference | surroundings of at least one hole part of a 2nd half body.

  You may further provide the cylindrical member arrange | positioned at a hole.

  The fiber reinforced resin structure may be a vehicle suspension arm.

  As described above, according to the present invention, the rigidity and strength of the hole provided in the fiber reinforced resin structure can be improved.

It is a schematic diagram which shows the suspension apparatus provided with the lower arm as an example of a fiber reinforced resin structure. It is explanatory drawing which shows a suspension apparatus. It is a perspective view which shows the fiber reinforced resin structure (lower arm) concerning embodiment of this invention. It is explanatory drawing which shows the manufacturing method of the fiber reinforced resin structure concerning the embodiment. It is explanatory drawing which shows the manufacturing method of the fiber reinforced resin structure concerning the embodiment. It is explanatory drawing which shows the manufacturing method of the fiber reinforced resin structure concerning the embodiment. It is explanatory drawing which shows the lamination process of the manufacturing method of the fiber reinforced resin structure concerning the embodiment. It is sectional drawing of the hole of the fiber reinforced resin structure concerning the embodiment.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol. In the present specification and drawings, a plurality of components having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numeral. However, when it is not necessary to particularly distinguish each of a plurality of constituent elements having substantially the same functional configuration, only the same reference numerals are given.

<1. Fiber Reinforced Resin Structure>
(1-1. Outline of lower arm)
First, with reference to FIG.1 and FIG.2, the lower arm (suspension arm) 20 as an example of the fiber reinforced resin structure manufactured by the manufacturing method of the fiber reinforced resin structure concerning this embodiment is demonstrated. FIG. 1 is a schematic diagram for explaining a configuration example of a suspension device 100 for a front wheel of a vehicle provided with a lower arm 20, and FIG. 2 is an exploded perspective view of the lower arm 20 and the suspension cross member 108.

  In the suspension device 100, the left and right sides of the engine room 102 are partitioned by a front wheel apron 103 that is a component of the vehicle body frame. The front wheel apron 103 is joined to a pair of left and right side frames 105 extending in the front-rear direction of the vehicle body. A strut tower 106 is formed at the rear of the front wheel apron 103. A strut suspension 107 is accommodated in the strut tower 106. The upper portion of the suspension 107 is supported by a strut support portion 106a formed on the upper portion of the strut tower 106 via a strut upper mount 107a.

  A suspension cross member 108 is disposed below the engine room 102. Upper surfaces of both ends of the suspension cross member 108 in the vehicle width direction are fixed to the side frame 105 via fasteners such as bolts and nuts. Further, the rear portion of the engine (not shown) is mounted on the upper surface of the suspension cross member 108 via an engine mount. In addition, arm support portions 109 project from the lower surfaces of both ends of the suspension cross member 108 in the vehicle width direction. Each of the left and right arm support portions 109 includes a pair of brackets 109a and 109b facing the front, rear, left and right with a predetermined interval, and bolt insertion holes 109c are formed in the brackets 109a and 109b. Between the brackets 109a and 109b, a cylindrical first base portion 21 provided at one base end of the lower arm 20 is disposed.

  The lower arm 20 continues from the first base portion 21 serving as one base end to the distal end portion 23, branches from the central portion, extends rearward, and continues to the second base portion 22 serving as the other base end. It has a T-shaped or L-shaped planar shape. A bush (not shown) is press-fitted into the first base portion 21 of the lower arm 20. A shaft portion of a bolt 112 inserted from the outside through a bolt insertion hole 109 c formed in the brackets 109 a and 109 b is penetrated through the bush, and the shaft portion of the bolt 112 is fastened by a nut 113.

  Further, a bush (not shown) is press-fitted into the second base portion 22. The second base 22 is pivotally supported on the side frame 105 via a bush. Further, a bush (not shown) is press-fitted into the distal end portion 23 serving as the swing end. The distal end portion 23 is connected to a ball joint (not shown) via a bush, and a wheel hub (not shown) that fixes the front wheel 111 is rotatably supported. As a result, the lower arm 20 supports the lower portion of the suspension 107 via a hub housing (not shown) and is swingably supported by the suspension cross member 108 and the side frame 105.

(1-2. Configuration example of lower arm)
Next, a configuration example of the lower arm 20 as the fiber reinforced resin structure according to the present embodiment will be described in detail. FIG. 3 is a perspective view showing an example of the lower arm 20. The lower arm 20 has a substantially T-shaped or L-shaped planar shape, and includes a first base 21 connected to the suspension cross member 108, a second base 22 connected to the side frame 105, and a ball joint. Are connected to each other and have a tip portion 23 which is a swing end. The lower arm 20 is disposed in the main body 18, the holes 19a, 19b, and 19c provided in the first base 21, the second base 22, and the tip 23, and the holes 19a, 19b, and 19c. And cylindrical members 27, 28, and 29. The first base portion 21, the second base portion 22, and the distal end portion 23 are provided on the distal end sides of the arm portions 25a, 25b, and 25c, respectively.

  The main body 18 is formed using, for example, a fiber reinforced resin sheet containing continuous fibers. The fiber reinforced resin sheet containing continuous fibers is formed by impregnating continuous fibers with a matrix resin. Moreover, the main-body part 18 is comprised by the 1st half body 18a and the 2nd half body 18b which were mutually joined. The first half 18 a and the second half 18 b are joined at a joining surface along a plane passing through the first base 21, the second base 22, and the tip 23. The first half 18a and the second half 18b are each molded using a fiber reinforced resin sheet containing continuous fibers. The joining method of the first half 18a and the second half 18b is not particularly limited, and various methods such as joining with an adhesive, vibration melting and pressure bonding, and heat melting and pressure bonding should be adopted. Can do.

  Examples of continuous fibers used include carbon fibers, but other fibers may be used, and a plurality of fibers may be used in combination. However, since carbon fibers are excellent in mechanical properties, it is preferable that the reinforcing fibers include carbon fibers.

  As the matrix resin of the fiber reinforced resin, a thermoplastic resin or a thermosetting resin is used. Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, polyvinyl chloride resin, ABS resin, polystyrene resin, AS resin, polyamide resin, polyacetal resin, polycarbonate resin, thermoplastic polyester resin, PPS (polyphenylene sulfide) resin, fluorine Examples thereof include resins, polyetherimide resins, polyetherketone resins, polyimide resins and the like.

  As the matrix resin, one or a mixture of two or more of these thermoplastic resins can be used. Alternatively, the matrix resin may be a copolymer of these thermoplastic resins. Further, when the matrix resin is a mixture of these thermoplastic resins, a compatibilizing agent may be used in combination. Furthermore, the matrix resin may contain a brominated flame retardant as a flame retardant, a silicon flame retardant, red phosphorus, or the like.

  In this case, examples of the thermoplastic resin used include polyolefin resins such as polyethylene and polypropylene, polyamide resins such as nylon 6 and nylon 66, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyether ketone, Examples of the resin include polyether sulfone and aromatic polyamide. Among them, the thermoplastic matrix resin is preferably at least one selected from the group consisting of polyamide, polyphenylene sulfide, polypropylene, polyether ether ketone, and phenoxy resin.

  Examples of the thermosetting resin that can be used as the matrix resin include epoxy resins, unsaturated polyester resins, vinyl ester resins, phenol resins, polyurethane resins, and silicon resins. As the matrix resin, one type of these thermosetting resins or a mixture of two or more types can be used. When these thermosetting resins are used for the matrix resin, an appropriate curing agent or reaction accelerator may be added to the thermosetting resin.

  A bush is press-fitted into the cylindrical members 27, 28, and 29. Therefore, as the cylindrical members 27, 28, 29, for example, metal cylindrical members are used. Examples of metals that can be used include, but are not limited to, stainless steel, cast iron, titanium, titanium alloys, and the like. The cylindrical members 28 and 29 disposed on the second base portion 22 and the distal end portion 23 may be disposed after joining the first half body 18a and the second half body 18b to form the holes 19b and 19c. Good. Alternatively, the cylindrical members 28 and 29 arranged at the second base portion 22 and the distal end portion 23 form holes 19b and 19c in the first half 18a and the second half 18b, respectively, and the first half 18a and the second half 18b. It may be arranged after joining the body 18a and the second half 18b.

  In addition, the cylindrical member 27 disposed on the first base 21 forms a half of the first base 21 in each of the first half 18a and the second half 18b, and the first half 18a. And after arrange | positioning the 2nd half body 18b and forming the hole part 19a, you may arrange | position. Alternatively, the first half 21a and the second half 18b are respectively formed with the first base 21 half, and the first half 18a and the second half 18b are joined to each other when the first half 18a and the second half 18b are joined. The member 27 may be sandwiched and attached.

  In the lower arm 20 configured as described above, the cylindrical member 27 disposed on the cylindrical first base portion 21 has a central axis substantially coinciding with the front-rear direction of the vehicle, and the tip portion 23 swings in the vertical direction. Enable. In addition, the cylindrical member 28 disposed on the second base portion 22 has a central axis along a substantially vertical direction, and enables the tip portion 23 to swing in the horizontal direction. Since the load and vibration to the vehicle body are transmitted to the lower arm 20, a large load can be generated in each of the first base portion 21, the second base portion 22, and the distal end portion 23. Therefore, high rigidity and strength are required for the first base portion 21, the second base portion 22, and the tip portion 23. For this reason, in the lower arm 20 according to the present embodiment, continuous fibers are arranged along the peripheries of the holes 19b and 19c, and the strength of the holes 19b and 19c is increased.

<2. Manufacturing method of fiber reinforced resin structure>
Next, an example of the manufacturing method of the fiber reinforced resin structure concerning this embodiment is demonstrated. Here, bagging is performed after laminating a fiber reinforced resin sheet in which a reinforcing fiber is impregnated with a thermosetting matrix resin on a mold, and the bag (covering sheet) is decompressed using an autoclave device. An example of a method for manufacturing the lower arm 20 in which the entire bag is heated while being pressurized to cure the laminate of fiber reinforced resin will be described. In addition, the manufacturing method of the fiber reinforced resin structure demonstrated below is only an example, and does not limit this invention.

The manufacturing method of the fiber reinforced resin structure concerning this embodiment includes the following processes.
・ Prepreg cutting process ・ Lamination process ・ Bugging process ・ Molding process ・ Join process ・ Drilling process

  Hereinafter, the manufacturing method of the fiber reinforced resin structure shown in FIG. 3 is demonstrated in order of a process, referring FIGS. 4-7 suitably. 4-6 is explanatory drawing which shows the flow of the manufacturing method of the lower arm 20 concerning this embodiment.

(2-1. Prepreg cutting process)
As shown in FIG. 4, in the prepreg cutting step, the fiber reinforced resin sheet 5 having a predetermined width is cut into a size or length suitable for the fiber reinforced resin structure to be manufactured, and the prepreg 12 is produced. . The shape of the prepreg 12 can be made to substantially match the shape of the developed main body 18. In this case, the dimension of the prepreg 12 may be larger than the outer shape of the main body 18.

  The fiber reinforced resin sheet 5 including continuous fibers is manufactured by, for example, impregnating a matrix resin into the reinforcing fibers while continuously feeding the reinforcing fibers by a known film impregnation method or melt impregnation method. The fiber reinforced resin sheet 5 is appropriately cut to produce a prepreg 12 having a desired planar shape. The thickness of one fiber reinforced resin sheet 5 or prepreg 12 can be set to a value within a range of 0.03 to 1.0 mm, for example.

(2-2. Lamination process)
As shown in FIG. 5, in the laminating step, a plurality of prepregs 12 are laminated to produce a fiber reinforced resin laminate 14. The prepreg 12 is laminated on the molding surface of the molding die 40, for example. The number of prepregs 12 to be laminated is not particularly limited, and can be selected according to the use of the fiber reinforced resin structure to be manufactured. For example, 3 to 6 prepregs 12 can be laminated. . At this time, the fiber reinforced resin laminate 14 may be manufactured by aligning the orientation directions of the continuous fibers of the prepregs 12 in one direction. Thereby, the intensity | strength of the specific direction in alignment with the orientation direction of a continuous fiber in the lower arm 20 manufactured can be raised. Or the fiber reinforced resin laminated body 14 may be produced by laminating the continuous fibers of some or all of the prepregs 12 with different orientation directions. Thereby, the intensity | strength of the lower arm 20 manufactured can be given anisotropy.

  In addition, when laminating | stacking the several prepreg 12 and shape | molding the fiber reinforced resin laminated body 14, the kind, content rate, etc. of the reinforced fiber contained in each fiber reinforced resin sheet may differ. Further, in a plurality of fiber reinforced resin sheets to be laminated, the matrix resin may be made of different compatible materials, or different additives may be mixed with the same matrix resin. Good. Even in this case, a matrix resin having an approximate melting point may be used so that the fiber reinforced resin laminate 14 can be efficiently melted and cured.

  Here, in the method for manufacturing the lower arm 20 according to the present embodiment, when the prepreg 12 is laminated in the laminating process, continuous fibers oriented in one direction along the periphery of the portion corresponding to the holes 19b and 19c are used. Place a continuous fiber reinforced sheet containing. Thereby, the holes 19b and 19c of the manufactured lower arm 20 are reinforced by the continuous fibers, and the rigidity and strength can be improved.

  FIG. 7 is an explanatory diagram showing a state in which the prepreg 12 and the continuous fiber reinforcing sheets 13a and 13b are laminated and the second base portion 22 is formed in the lamination step. For example, the prepreg 12 constituting the main body portion 18 is arranged such that continuous fibers are oriented along the extending direction of the arm portion 25 b whose tip is the second base portion 22. When the main body portion 18 is configured by stacking the prepregs 12 arranged in this way, the continuous fibers are cut in the hole portion 19b by performing a perforating process. Therefore, the continuity of the fiber is lost in the hole 19b, and the rigidity and strength around the hole 19b are significantly reduced. In particular, since the fiber length on the distal end side of the arm portion 25b is shortened around the hole portion 19b, the hole portion 19b is easily broken.

  On the other hand, in the manufacturing method of the lower arm 20 according to the present embodiment, the continuous fiber reinforcing sheets 13a and 13b made of a fiber reinforced resin sheet (UD (Uni-Directional) material) including continuous fibers oriented in one direction, It arrange | positions along the circumference | surroundings of the site | part (henceforth a "drilling plan site | part") corresponding to the hole part 19b. Thereby, the continuity of the fibers around the hole 19b is maintained even after the drilling process is performed, and the rigidity and strength around the hole 19b can be prevented from being lowered. The continuous fiber reinforcing sheets 13a and 13b can be formed by cutting the above-described fiber reinforced resin sheet 5 (see FIG. 4) into a predetermined length and width. That is, the thickness of the continuous fiber reinforcing sheets 13 a and 13 b may be the same as the thickness of the prepreg 12.

  In the example shown in FIG. 7, the continuous fiber reinforcing sheets 13a and 13b made of UD material are disposed along the periphery of the distal end side of the arm portion 25b at the hole-scheduled portion 19b ′, and both ends thereof are arm portions 25b. It is arranged so as to extend along the extending direction. Thereby, the continuous fibers are continuously arranged along the periphery of the hole 19b on the tip side, and the periphery of the hole 19b on the tip side of the arm 25b is reinforced. Thereby, the rigidity and strength of the hole 19b can be improved. Further, the continuous fiber reinforcing sheets 13a and 13b are arranged so that both end portions thereof are along the extending direction of the arm portion 25b, so that the continuous fiber reinforcing sheet is heated and pressurized in the molding process and cured. The continuous fibers included in 13a and 13b can easily enter between the continuous fibers included in the prepreg 12 of the arm portion 25b and are easily integrated.

  At this time, the continuous fiber reinforcing sheets 13a and 13b may be arranged on the prepreg 12 laminated in a plurality. However, in order to improve the integrity of the prepreg 12 and the continuous fiber reinforcing sheets 13a and 13b, a plurality of continuous fiber reinforcing sheets 13a and 13b may be used. It is preferably laminated between the prepregs 12. Moreover, the number of the continuous fiber reinforcing sheets 13a and 13b to be arranged is not particularly limited. However, if only one continuous fiber reinforcing sheet 13a, 13b is used, the rigidity and strength of the hole 19b may not be sufficiently improved. Moreover, when there are too many continuous fiber reinforcement sheet | seats 13a and 13b, there exists a possibility that the thickness of the circumference | surroundings of the hole part 19b may become thick too much, and the level | step difference of a boundary and the part in which the continuous fiber reinforcement sheet | seats 13a and 13b are not arrange | positioned is large. Become. Therefore, the number of the continuous fiber reinforcing sheets 13a and 13b to be arranged can be 2 to 5, for example.

  Further, as shown in FIG. 7, when a plurality of continuous fiber reinforcing sheets 13 a and 13 b are arranged, the continuous fiber reinforcing sheets 13 a and 13 b may be arranged by shifting the positions of the end portions. By shifting the position of the end portion in this way, the step at the boundary with the portion where the continuous fiber reinforcing sheets 13a and 13b are not arranged can be made gentle. Although the example which shifted the edge part of two continuous fiber reinforcement sheets 13a and 13b is shown by FIG. 7, when laminating | stacking three or more continuous fiber reinforcement sheets 13a and 13b, all edge part is shown. It may be shifted, or a part of the ends may be shifted.

  In addition, although the example which arrange | positions the continuous fiber reinforcement sheet | seats 13a and 13b along the circumference | surroundings of the punching plan site | part 19b 'of the 2nd base 22 was demonstrated here, also about the front-end | tip part 23, a drilling plan site | part similarly A continuous fiber reinforced sheet may be disposed along the periphery of the. The continuous fiber reinforcing sheet may be disposed on one of the second base portion 22 and the distal end portion 23, or may be disposed on both.

(2-3. Bagging process)
As shown in FIG. 5, in the bagging process, a rubber bag (covering sheet) 31, for example, is installed on the fiber reinforced resin laminate 14 disposed on the mold 40. Is clamped. For example, the mold 40 may be a mold or a fiber-reinforced resin mold. The bag 31 may be a bag made of a deformable material, and is not limited to a rubber bag. However, both the mold 40 and the bag 31 are made of a material that can withstand heat treatment using an autoclave device in a subsequent process. By such bagging, the molding space 33 formed by at least the molding die 40 and the bag 31 is airtight.

(2-4. Molding process)
As shown in FIG. 5, in the molding step, the bagged fiber reinforced resin laminate 14 is put into an autoclave apparatus. The autoclave device is a device that performs heat treatment while keeping the inside of the kettle in a high pressure state. After the fiber reinforced resin laminate 14 is put into the autoclave device, the air in the molding space 33 is sucked by the pump 35 or the like, and the molding space 33 is evacuated. Thereby, the fiber reinforced resin laminate 14 is heated and cured under pressure while the air inside the prepreg 12 and the continuous fiber reinforcing sheets 13a and 13b is degassed. Thereby, the 1st half 18a which comprises main part 18 is fabricated. By heating under pressure while the molding space 33 is in a vacuum state, the cavity ratio of the first half 18a to be molded can be reduced, and the mechanical strength of the first half 18a is increased. Can do. Further, since the inside of the molding space 33 is evacuated, the surface opposite to the surface in contact with the mold 40 has a relatively clean finish.

  The second half 18b is also formed by the same procedure as the prepreg cut process, the lamination process, the bagging process, and the molding process described so far.

(2-5. Drilling step)
As shown in FIG. 6, in the drilling step, drilling is performed on the planned drilling portions of the second base 22 and the tip 23 in the first half 18a and the second half 18b, respectively. Holes 19b and 19c are formed. FIG. 6 shows a state in which the holes 19b and 19c are formed in the first half 18a. Similarly, the holes 19b and 19c are formed in the second half 18b. As the drilling process, a water jet process, a laser process, or a drilling process using a tool such as a drill or an end mill can be employed. However, the drilling process is not limited to this example.

(2-6. Joining process)
As shown in FIG. 6, in the joining step, the first half 18 a and the second half 18 b are joined to produce the main body 18. The joining method is not particularly limited, and various methods can be adopted including joining with an adhesive, vibration fusion pressing, and thermal fusion pressing. In the example of the method for manufacturing the lower arm 20 according to the present embodiment, the hole 19a of the first base 21 is formed by joining the first half 18a and the second half 18b.

  Further, when joining the first half 18a and the second half 18b, the cylindrical member 27 is disposed in a portion corresponding to the hole 19a of the first base 21, and the hole 19a and the cylindrical member 27 are disposed. And may be joined. In this case, since the inner surface of the hole 19a is not a surface formed by the molding surface of the molding die 40, the cylindrical member 27 may be joined after the surface accuracy is improved by cutting or the like. Thereafter, although not shown, the cylindrical members 28 and 29 are respectively disposed in the holes 19b and 19c formed in the main body 18, and the lower arm 20 is manufactured.

  FIG. 8 schematically shows an example of a cross section of the manufactured lower arm 20 in which the arm portion 25b is cut so as to include the axis of the hole portion 19b of the second base portion 22. The left side of FIG. 8 is the tip side of the arm portion 25b. In the example of the lower arm 20, four prepregs 12 and three continuous fiber reinforcing sheets 13a and 13b are alternately stacked. The arm portion 25b of the lower arm 20 is formed by laminating a plurality of prepregs 12 and heat-curing them. Therefore, the continuous fibers are oriented along the horizontal direction shown in the figure. In the said arm part 25b, since a continuous fiber is arrange | positioned without cut | disconnecting, rigidity and intensity | strength are ensured.

  Moreover, the part located in the front end side of the arm part 25b among the circumference | surroundings of the hole part 19b has laminated | stacked the prepreg 12 and continuous fiber reinforcement sheet | seat 13a, 13b alternately, and is heat-hardened. Among these, in the layer comprised by the prepreg 12, the continuous fiber is orientated along the left-right direction of illustration. On the other hand, in the layer constituted by the continuous fiber reinforcing sheets 13a and 13b, the continuous fibers are oriented along the illustrated depth direction. Therefore, although the continuous fibers included in the prepreg 12 are cut short, the continuous fibers included in the continuous fiber reinforcing sheets 13a and 13b are arranged around the hole 19b, and the rigidity of the hole 19b and Strength is secured.

  As described above, in the method for manufacturing a fiber reinforced resin structure according to the present embodiment, when the fiber reinforced resin laminate 14 is produced by laminating the prepreg 12 made of a fiber reinforced resin sheet, A continuous fiber reinforcing sheet 13a, 13b made of UD material is disposed along the periphery. Therefore, even if the continuous fiber contained in the prepreg 12 is cut by the drilling process and a portion having a short fiber length is generated, the continuous fiber contained in the continuous fiber reinforcing sheets 13a and 13b causes the periphery of the hole 19b. The continuity of the fiber is maintained. Therefore, the rigidity and strength of the hole 19b can be improved.

  Further, in the lower arm 20 manufactured by the method for manufacturing the fiber reinforced resin structure according to the present embodiment, the rigidity and strength of the holes 19b and 19c in which the cylindrical members 28 and 29 are arranged are improved, and the second base 22 is improved. And the mechanical strength of the front-end | tip part 23 is raised. Therefore, it is possible to obtain the lower arm 20 having excellent durability against a load due to a load or vibration.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, in the above-described embodiment, the drilling process is performed after the first half 18a and the second half 18b are joined. However, the order of the joining process and the drilling process may be reversed. In this case, the first half body 18a and the second half body 18b are joined to each other after the first half body 18a and the second half body 18b are drilled, and the main body portion 18 is formed. The

  Moreover, in the said embodiment, although demonstrated taking the example of the manufacturing method including the bagging process and the shaping | molding process using an autoclave apparatus, this invention is not limited to this example. For example, the present invention can be applied even to a manufacturing method including a step of molding a fiber-reinforced resin laminate by heating and melting using a thermoplastic resin and then cooling.

  In the above embodiment, the lower arm 20 has been described as an example of the fiber reinforced resin structure. However, the fiber reinforced resin structure to which the present invention is applicable is not limited to the lower arm. The present invention can also be applied to structural members used for various purposes other than the structural member of the vehicle body.

DESCRIPTION OF SYMBOLS 5 Fiber reinforced resin sheet 12 Prepreg 13a, 13b Continuous fiber reinforced sheet 14 Fiber reinforced resin laminated body 18 Main body part 18a 1st half 18b 2nd half 19a, 19b, 19c Hole 20 Fiber reinforced resin structure (lower arm) )
21 1st base part 22 2nd base part 23 Tip part 27,28,29 Cylindrical member 40 Mold

Claims (8)

A method for producing a fiber reinforced resin structure, wherein a fiber reinforced resin laminate is produced by curing a fiber reinforced resin laminate in which a plurality of fiber reinforced resin sheets impregnated with a matrix resin in a reinforced fiber is laminated,
A lamination step of laminating the plurality of fiber reinforced resin sheets to produce the fiber reinforced resin laminate,
A molding step of curing the fiber reinforced resin laminate and molding the fiber reinforced resin structure;
Performing a drilling process on the fiber reinforced resin structure, and forming a hole, and,
The manufacturing method of the fiber reinforced resin structure which arrange | positions the continuous fiber reinforcement sheet | seat which impregnated the matrix resin to the continuous fiber orientated in one direction along the circumference | surroundings corresponding to the said hole part in the said lamination process.   The manufacturing method of the fiber reinforced resin structure of Claim 1 which laminates | stacks the said continuous fiber reinforcement sheet between the said fiber reinforced resin sheets.   The method for producing a fiber-reinforced resin structure according to claim 1 or 2, wherein when a plurality of the continuous fiber reinforced sheets are arranged, the positions of all or a part of the plurality of continuous fiber reinforced sheets are shifted.   The manufacturing method of the fiber reinforced resin structure of any one of Claims 1-3 further equipped with the process of arrange | positioning a cylindrical member in the said hole. A main body molded using fiber reinforced resin;
A hole provided in the main body,
A fiber reinforced resin structure in which continuous fibers are arranged along the periphery of the hole. The main body is formed by joining a first half and a second half,
The hole is provided through the first half and the second half,
The fiber reinforced resin structure according to claim 5, wherein the continuous fibers are disposed along the periphery of at least one of the first half and the second half.   The fiber reinforced resin structure according to claim 6, further comprising a cylindrical member disposed in the hole. The fiber reinforced resin structure according to any one of claims 5 to 7, wherein the fiber reinforced resin structure is a suspension arm for a vehicle.

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