JP6858541B2 - Manufacturing method of composite material molded product - Google Patents

Description

The present invention relates to a method for producing a composite material molded product.

Composite material molded products containing reinforcing fibers and matrix resin compositions are lightweight and have excellent mechanical properties, and are therefore widely used in various applications such as aircraft and vehicles. A sheet-shaped prepreg, which is an intermediate base material, in which a reinforcing fiber base material is impregnated with a matrix resin composition is widely used for producing a composite material molded product.

As a method for producing a composite material molded product, a compression molding method in which a molding precursor containing a prepreg is heated and pressed by a molding die composed of a pair of upper and lower dies is known (Patent Documents 1 to 3). Specifically, for example, a plurality of sheet-shaped prepregs cut into a predetermined shape are pasted on a preform mold and laminated, and the preform prepared into a shape close to the product shape is composed of a pair of upper and lower molds. Examples thereof include a method of obtaining a composite material molded product by heating and pressurizing with a molding mold. Such a compression molding method is suitable for mass production of composite material molded bodies because the molding time is relatively short as compared with other molding methods such as autoclave molding.

However, in such a compression molding method, a composite material molded body having corners formed by two flat plate portions having different thicknesses is molded in which the mold closing direction is orthogonal to the thickness direction of the thick flat plate portion. In the case of manufacturing with a mold, the corners of the obtained composite material molded product may be chipped, or the corners may become resin-rich and the strength may be reduced.

Specifically, a composite material molded body having corners formed by two flat plate portions having different thicknesses is produced, for example, by the following method.
As shown in FIG. 10A, two sheet-shaped prepregs 10 are provided on the upper surface of the preform type lower mold 110 in which the rectangular parallelepiped convex portion 114 is provided in the upper central portion of the flat plate-shaped main body portion 112. It is pasted along the entire body portion 112 and the convex portion 114. Next, the band-shaped prepreg 12 is wound and attached to the portion of the prepreg 10 that covers the side surface of the convex portion 114 a plurality of times, and then two sheet-shaped prepregs 10 are further along the entire main body portion 112 and the convex portion 114. To obtain the laminate 306.

Next, the laminate 306 is heated, the preform mold is closed and preformed to obtain a molding precursor (preform) 307. Next, the molding precursor 307 is placed in the lower mold of the molding mold for compression molding, the lower mold and the upper mold are brought close to each other, the mold is closed, and the composite material molded body 301 is obtained by heating and pressurizing.

As shown in FIG. 10B, the composite material molded body 301 obtained by the above method has a first flat plate portion 302 and a tubular second flat plate portion 303 hanging from the peripheral edge portion of the first flat plate portion 302 over the entire circumference. And a flange portion 304 projecting outward from the lower end portion of the second flat plate portion 303 in the vertical direction. When manufactured by the above method, the corner portion 305 formed by the first flat plate portion 302 and the second flat plate portion 303 having different thicknesses is likely to be chipped. Further, even if the corner portion 305 is not chipped, the corner portion 305 becomes resin-rich and the strength of the corner portion 305 tends to decrease.

International Publication No. 2004/048435 Japanese Patent No. 5679062 Japanese Patent No. 5686194

According to the present invention, even in the case of producing a composite material molded body having corners formed by two flat plates having different thicknesses, the corners may be chipped or the corners may be resin-rich. It is an object of the present invention to provide a method for producing a composite material molded product capable of suppressing such a situation.

The present invention has the following configurations.
[1] A molding precursor containing a sheet-shaped prepreg containing a reinforcing fiber and a matrix resin composition is heat-pressed and compression-molded by a molding die composed of a pair of dies to produce a composite material molded body having corners. How to do
The molding precursor having corners and containing a block body that does not flow during compression molding inside the prepreg is formed .
Compression molding is performed in a state where the corners of the block body are arranged at the corners forming the corners of the composite material molded body in the cavity of the molding die.
A method for producing a composite material molded product, wherein the block body contains a reinforcing fiber and a cured product of a thermosetting resin.
[2] The composite material molded body includes a first flat plate portion and a second flat plate portion thicker than the first flat plate portion, and the surface direction of the first flat plate portion and the second flat plate portion. Intersect, and corners are formed at the intersection,
The block body is included in a portion of the molding precursor that forms the second flat plate portion, and the molding precursor is molded so that the thickness direction of the portion and the mold closing direction of the molding mold intersect. The method for producing a composite material molded product according to [1], which is compression-molded in a state of being arranged in .

According to the method for manufacturing a composite material molded product, even when a composite material molded product having corners formed by two flat plate portions having different thicknesses is manufactured, the corner portions are chipped or the corner portions are formed. Can be suppressed from becoming resin-rich.

It is a perspective view which showed an example of the composite material molded article manufactured by the manufacturing method of this invention. FIG. 1A is a cross-sectional view taken along the line AA of FIG. 1A. It is a perspective view which showed the lower mold of the preform mold used in the manufacturing method of the composite material molded article of this invention. It is sectional drawing which showed one step of the manufacturing method of the composite material molded article of this invention. It is a perspective view which showed one step of the manufacturing method of the composite material molded article of this invention. FIG. 4A is a cross-sectional view taken along the line BB of FIG. 4A. It is a perspective view which showed one step of the manufacturing method of the composite material molded article of this invention. FIG. 5C is a cross-sectional view taken along the line CC of FIG. 5A. It is sectional drawing which showed one step of the manufacturing method of the composite material molded article of this invention. It is sectional drawing which showed an example of the molding die used in the manufacturing method of the composite material molded article of this invention. It is a figure which showed one step of the manufacturing method of the composite material molded body of this invention, and is the cross-sectional view which showed the state before closing a mold of a molding die. It is a figure which showed one step of the manufacturing method of the composite material molded body of this invention, and is the cross-sectional view which showed the state which the mold was closed. It is sectional drawing which showed an example of the composite material molded article manufactured by the manufacturing method of this invention. It is sectional drawing which showed an example of the molding precursor. It is sectional drawing which showed one step of the manufacturing method of the conventional composite material molded article. It is sectional drawing which showed the composite material molded article obtained by the manufacturing method shown in FIG. 10A.

In the method for producing a composite material molded product of the present invention, a molding precursor containing a sheet-shaped prepreg containing a reinforcing fiber and a matrix resin composition is heat-pressed by a molding mold consisting of a pair of molds and compression-molded. It is a method of manufacturing a composite material molded article having a part.
Hereinafter, an example of the method for producing the composite material molded product of the present invention will be described.

As an example of the method for producing the composite material molded product of the present invention, the method for producing the composite material molded product 1 exemplified in FIGS. 1A and 1B will be described.
The composite material molded body 1 includes a first flat plate portion 2 having a rectangular shape in a plan view, a tubular second flat plate portion 3 hanging from the peripheral edge portion of the first flat plate portion 2 over the entire circumference, and a second flat plate portion 2. A flange portion 4 that projects outward from the lower end portion of the third portion in the vertical direction is provided.

The second flat plate portion 3 is thicker than the first flat plate portion 2. The first flat plate portion 2 and the second flat plate portion 3 intersect each other in the surface directions, and a corner portion 5 is formed at the intersecting portion. As described above, the composite material molded body 1 has the first flat plate portion 2 and the second flat plate portion 3 thicker than the first flat plate portion 2 over the entire circumference on the upper peripheral edge portion of the first flat plate portion 2. It has a corner portion 5 formed by.
In the method for producing a composite material molded product of the present invention, a composite material molded product having corners formed on the upper side by flat plate portions having different thicknesses is used as a molding mold consisting of a pair of lower molds and upper molds. It is especially useful when manufacturing.

The angle θ of the corner portion 5 formed by the first flat plate portion 2 and the second flat plate portion 3 in this example is 90 °. The angle θ of the corner portion 5 is not limited to 90 °, and may be less than 90 ° or more than 90 °. The method for producing a composite material molded product of the present invention is particularly useful when the angle θ of the corner portion of the target composite material molded product is 90 to 135 °.
The angle θ of the corner portion 5 formed by the first flat plate portion 2 and the second flat plate portion 3 is the inside formed by the outer surface 2a of the first flat plate portion 2 and the outer surface 3a of the second flat plate portion 3. Means the angle of. When the corner portion is rounded, it means the angle formed by the flat portions of the two flat plate portions forming the corner portion.

Examples of the method for producing the composite material molded body 1 include a method having the following laminating step, preforming step, and heat compression step.
Laminating step: A prepreg and a block body having corners and not flowing during compression molding are laminated so that the block body is included inside the prepreg.
Preliminary shaping step: The laminate obtained in the laminating step is preformed to obtain a molding precursor (preform).
Heat compression step: A molding precursor is heated and pressed by a molding mold consisting of a pair of upper and lower molds to obtain a composite material molded product.
Hereinafter, each step will be described.

(Laminating process)
For example, the preform type lower mold 110 illustrated in FIG. 2 is used. The lower mold 110 is provided with a rectangular parallelepiped convex portion 114 at the upper central portion of the flat plate-shaped main body portion 112 having a rectangular plan view shape. The shape of the lower mold 110 may be any shape that is substantially complementary to the shape of the target composite material molded product, and can be appropriately designed according to the shape of the target composite material molded product.
The preform mold is further provided with an upper mold in addition to the lower mold 110, so that the lower mold 110 and the upper mold form a cavity having a shape close to the shape complementary to the shape of the target composite material molded body. It has become.

In the laminating step of this example, as shown in FIG. 3, two sheet-shaped prepregs 10 having a rectangular shape in a plan view are sequentially placed on the upper surface of the lower mold 110 along the entire main body portion 112 and the convex portion 114. It is pasted and laminated like this.
The number of laminated prepregs 10 to be attached to the lower mold 110 at this stage is not limited to two, and can be appropriately set, and may be one or three or more.

Next, as shown in FIGS. 4A and 4B, four block bodies 14 are arranged along each side surface on each side surface side around the convex portion 114 on the prepreg 10. The block body 14 is a long member having a rectangular plate shape cut in the length direction and does not flow during compression molding, and has four corner portions 16. In the block body 14, one surface 14a (side surface 14a) in the thickness direction is in contact with a portion of the prepreg 10 that covers the side surface of the convex portion 114 of the lower mold 110, and one surface 14b (lower surface 14b) in the width direction is the prepreg 10. The lower mold 110 is arranged so as to be in contact with the portion covering the upper surface of the main body portion 112 of the lower mold 110.

At both ends of the block body 14 in the length direction, the inclined surface 14e is such that the length of the side surface 14a facing the convex portion 114 side of the lower mold 110 is shorter than the length of the opposite side surface 14c. Is formed. Then, the inclined surfaces 14e of the two adjacent block bodies 14 are aligned with each other at the four corners when the convex portion 114 of the lower mold 110 is viewed in a plan view.

The thickness D2 (FIG. 4B) of the block body 14 is appropriately set according to the thickness D1 (FIG. 1B) of the second flat plate portion 3 corresponding to the portion where the block body 14 is contained in the target composite material molded body 1. do it.
Assuming that the thickness of the first flat plate portion 2 is d [mm] with respect to this D1 [mm], the thickness D2 [mm] of the block body 14 satisfies the relationship of d ≦ D2 ≦ D1-0.4. Is preferable. When the thickness D2 of the block body 14 is within the range of this relationship, it is easy to prevent the corner portion 5 of the obtained composite material molded body 1 from being chipped or having a resin-rich portion.

The width L (FIG. 4B) of the block body 14 is appropriately set according to the height H (FIG. 1B) of the second flat plate portion 3 corresponding to the portion where the block body 14 is contained in the target composite material molded body 1. Just do it. In this example, the width L of the block body 14 is the same as the height h of the convex portion 114 of the lower mold 110. As a result, as shown in FIGS. 3A and 3B, the upper surface 14d of the block body 14 and the upper surface of the prepreg 10 covering the upper surface of the convex portion 114 of the lower mold 110 are flush with each other in the state where the block body 14 is arranged. It has become.

After arranging the block body 14, as shown in FIGS. 5A and 5B, the band-shaped prepreg 12 is wound twice around the side surface 14c side (outside) of the block body 14. As a result, the block body 14 arranged on the prepreg 10 can be firmly fixed, and the subsequent workability is improved.

The number of times the strip-shaped prepreg 12 is wound around the block body 14 is not limited to two times, and may be one time or three times or more.
The number of times the strip-shaped prepreg 12 is wound around the block body 14 is preferably one, with the upper limit being the number of layers corresponding to the numerical values of D1-D2 and the lower limit. When the number of windings of the prepreg 12 is within the range, the block body 14 arranged on the prepreg 10 is easy to stabilize, the workability is improved, and the corner portion 5 of the obtained composite material molded body 1 is chipped or resin-rich. Is easy to suppress.

Next, as shown in FIG. 6, two sheet-shaped prepregs 10 having a rectangular shape in a plan view are further covered so as to cover all of the already pasted prepregs 10, the block body 14, and the strip-shaped prepregs 12. The lower mold 110 is pasted and laminated so as to follow the shapes of the main body portion 112 and the convex portion 114. As a result, the laminate 18 containing the block body 14 inside the prepreg 10 is obtained.
The number of laminated prepregs 10 that cover the entire block body 14 after arrangement is not limited to two, and can be appropriately set, and may be one or three or more.

The prepregs 10 and 12 are composite materials containing reinforcing fibers and a matrix resin composition. Examples of the prepregs 10 and 12 include a sheet-shaped reinforcing fiber base material impregnated with a matrix resin composition. It is preferable to use the same prepreg 10 and prepreg 12.

As the form of the reinforcing fiber base material, for example, a UD sheet (unidirectional sheet) in which a large number of long reinforcing fibers are aligned in one direction, a cloth material obtained by weaving reinforcing fibers into a woven fabric, and a non-woven fabric composed of reinforcing fibers. And so on. Among them, the cloth material is preferable from the viewpoint of the design of the composite material molded body. The cloth material may be a unidirectional woven fabric in which reinforcing fibers are arranged in a required direction, a bidirectional woven fabric such as plain weave, satin weave, or twill weave, or a cloth material having a woven structure such as triaxial woven fabric or non-crimp woven fabric. It is preferable to use a plain weave having excellent design and a twill weave having excellent design and workability. As the reinforcing fiber base material, one type may be used alone, or two or more types may be used in combination.

Examples of the reinforcing fiber constituting the reinforcing fiber base material include carbon fiber, aramid fiber, silicon carbide fiber, alumina fiber, boron fiber, tungsten carbide fiber, glass fiber and the like. Among them, carbon fiber is preferable as the reinforcing fiber because it is excellent in specific strength and specific elastic modulus. As the reinforcing fiber, one type may be used alone, or two or more types may be used in combination.

Basis weight of the reinforcing fiber base material is preferably from ^{70~800g / m 2, 150~250g / m} 2 is more preferable. When the basis weight of the reinforcing fiber base material is within the above range, the impregnation property of the matrix resin composition is good. If it is 70 g / m ² or more, a molded product having a better appearance can be obtained. If it is 150 g / m ² or more, a composite material molded product having a smooth surface can be obtained at low cost. If it is 800 g / m ² or less, the processing of the reinforcing fiber base material becomes easy.

The matrix resin contained in the matrix resin composition may be a thermosetting resin or a thermoplastic resin. As the matrix resin, a thermosetting resin which is excellent in impregnation property of the resin and easily develops mechanical properties is preferable.
As the thermosetting resin, a known thermosetting resin used for prepreg can be used, and examples thereof include epoxy resin, phenol resin, unsaturated polyester resin, urethane resin, and urea resin. Among them, as the thermosetting resin, an epoxy resin is preferable from the viewpoint of mechanical properties of the composite material molded product. As the thermosetting resin, one type may be used alone, or two or more types may be used in combination.

The matrix resin composition may contain flame retardants, weathering improvers, antioxidants, heat stabilizers, UV absorbers, plasticizers, lubricants, colorants, compatibilizers, non-fibrous fillers, conductives, as required. Additives such as a sex filler, a mold release agent, and a surfactant may be blended. As the additive, one type may be used alone, or two or more types may be used in combination.

The ratio α1 / α2 of the coefficient of thermal expansion α1 of the block body 14 to the coefficient of thermal expansion α2 of the prepregs 10 and 12 is 0.2 to 6, preferably 1 to 2. When the ratio α1 / α2 is within the above range, the degree of thermal deformation of the block body 14 and the prepregs 10 and 12 during compression molding is the same, and peeling occurs at the boundary between the block body 14 and the prepregs 10 and 12. Can be suppressed.
When the coefficient of thermal expansion of the prepreg 10 and the coefficient of thermal expansion of the prepreg 12 are different, the coefficient of thermal expansion α2 is the mass average value of the coefficient of thermal expansion of the prepreg 10 and the coefficient of thermal expansion of the prepreg 12.

The material of the block body 14 may be any material that does not flow during compression molding and satisfies the above-mentioned ratio α1 / α2. For example, a block body or metal containing a reinforcing fiber and a cured product of a thermosetting resin. Examples include made blocks. Among them, as the block body 14, a block body containing a reinforcing fiber and a cured product of a thermosetting resin is preferable.

Examples of the reinforcing fiber and the thermosetting resin used for the block body 14 include the same ones mentioned in the description of the prepreg, and the preferred embodiment is also the same. The reinforcing fibers used in the block body 14 may be one type or two or more types. The thermosetting resin used for the block body 14 may be one type or two or more types. It is preferable to use the same reinforcing fibers and thermosetting resin for the prepregs 10 and 12 and the block body 14.
The block body 14 containing the reinforcing fiber and the cured product of the thermosetting resin is obtained by curing the thermosetting resin using, for example, a sheet-shaped prepreg in which the reinforcing fiber base material is impregnated with the thermosetting resin composition. It is obtained by a method of molding a flat plate-shaped composite material molded body and then cutting the composite material molded body into strips.

Examples of the metal forming the block body include aluminum, brass, titanium and the like. The metal forming the block body may be one kind or two or more kinds.

(Preliminary shaping process)
The laminate 18 obtained in the laminating step is heated, and the upper mold is closed in close proximity from above the lower mold 110 of the preform mold to pressurize and preform. As a result, a molding precursor (preform) 20 having a shape close to the shape of the target composite material molded body 1 can be obtained. In the molding precursor 20, the block body 14 is included in the portion forming the second flat plate portion 3 of the target composite material molded body 1. Further, the corner portion 16 on the side of the block body 14 in the molding precursor 20 far from the convex portion 114 of the lower mold 110 is arranged at a position corresponding to the corner portion 15 of the target composite material molded body 1.

As a method of heating the laminate in the preliminary shaping, a known method can be appropriately used, and examples thereof include a method of heating the laminate from above using a heating heater.

(Heat compression process)
For heat compression molding, a molding die 200 composed of a pair of upper die 210 and lower die 220 illustrated in FIG. 7 is used. The lower mold 220 is provided with a convex portion 224 on the upper surface side of the main body portion 222. A recess 212 is formed on the lower surface side of the upper mold 210. In a state where the upper mold 210 and the lower mold 220 are brought close to each other and the mold 200 is closed, a cavity 201 having a shape complementary to the shape of the target composite material molded body 1 is formed.

As shown in FIG. 8A, the molding precursor 20 is placed on the lower mold 220 of the molding die 200. Next, as shown in FIG. 8B, the upper mold 210 is brought close to the lower mold 220 to close the molding mold 200, and the molding precursor 20 is heated and pressed for compression molding. In the present embodiment, at the time of compression molding, the corner portion 16 of the block body 14 included in the molding precursor 20 forms the corner portion 5 of the target composite material molded body 1 in the cavity 201 of the molding die 200. It is arranged in the corner 202 of. Further, the thickness direction of the portion forming the second flat plate portion of the molding precursor 20 and the mold closing direction of the molding die 200 are orthogonal to each other.

By heating the molding die 200, the molding precursor 20 in contact with the molding die 200 can be heated. As the material of the molding die 200, a steel material equivalent to SCM440 is preferable from the viewpoint of the hardness of the reinforcing fibers.

The molding temperature can be appropriately set according to the type of matrix resin and the like.
The molding time may be appropriately set according to the molding temperature.

When a thermosetting resin is used as the matrix resin, the molding die 200 is opened and the composite material molded body 1 is removed after the prepreg is sufficiently cured. When a thermoplastic resin is used as the matrix resin, the molding die 200 is opened to remove the composite material molded body 1 after sufficiently cooling the thermoplastic resin until it solidifies. As a result, the composite material molded product 1 in which chipping and resin-rich portions are suppressed from being generated in the corner portions 5 can be obtained.

The factors that suppress the formation of chips and resin-rich portions in the corners 5 of the composite material molded body 1 are considered as follows.
Specifically, in the conventional method described above, the portion of the molding precursor 307 that forms the second flat plate portion 303 is thickened by winding the band-shaped prepreg 12 a plurality of times. Since the portion around which the prepreg 12 is wound many times is uncured before compression molding, the reinforcing fibers and resin flow when a force is applied in the vertical direction by the upper and lower dies during compression molding. Easy to sink. Therefore, it is considered that a chip or a resin-rich portion is likely to be formed in the corner portion 305 of the obtained composite material molded body 301.

On the other hand, in the present embodiment, the block body 14 that does not flow during compression molding is included in the molding precursor 20, and the corner portion 16 of the block body 14 is the target in the cavity 201 of the molding die 200. It is arranged in the upper corner portion 202 forming the corner portion 5 of the composite material molded body 1. By compression molding with the molding die 200 in this state, the block body 14 is not deformed even if a force is applied in the vertical direction by the upper die 210 and the lower die 220, and the prepreg 10 sinks at the corner 202 in the cavity 201. It is suppressed from getting in. Therefore, it is possible to prevent the corner portion 5 of the obtained composite material molded product 1 from being chipped or a resin-rich portion from being formed.

As described above, according to the method for producing a composite material molded product of the present invention, it can be obtained by compression molding using a molding precursor having corners and containing a block body that does not flow during compression molding. It is possible to suppress the occurrence of chipping at the corners of the composite material molded product and the formation of resin-rich portions. Further, in the present invention, the ratio α1 / α2 of the coefficient of thermal expansion α1 of the block body to be used and the coefficient of thermal expansion α2 of the prepreg is controlled within a specific range, so that peeling or the like occurs at the boundary between the block body and the prepreg. The occurrence of defects is also suppressed.

The method for producing the composite material molded product of the present invention is not limited to the method for producing the composite material molded product 1 described above.
For example, the method for producing a composite material molded article of the present invention is not limited to the method for producing a composite material molded article having sharp corners, but is a method for producing a composite material molded article having rounded corners. It may be. Specifically, for example, an embodiment of manufacturing the composite material molded product 1A illustrated in FIG. 9A can be mentioned. The same parts as those in FIG. 1B in FIG. 9A are marked with the same marks, and the description thereof will be omitted. The composite material molded body 1A is the same as the composite material molded body 1 except that it has rounded corners 5A instead of the corners 5.

When the composite material molded body 1A is manufactured, for example, two sheet-shaped prepregs 10 are sequentially placed on the upper surface of the lower mold 110 in the same manner as in the case of manufacturing the composite material molded body 1, the main body portion 112 and the convex portion. It is pasted and laminated along the entire 114. Next, as shown in FIG. 9B, four block bodies 14A are arranged along each side surface on each side surface side around the convex portion 114 on the prepreg 10. The block body 14A is a plate-shaped long member similar to the block body 14 except that the corner portion 16A on the side far from the convex portion 114 on the upper side is rounded.

After arranging the block body 14A, the band-shaped prepreg 12 is wound twice on the side surface 14c side (outside) of the block body 14A, and two sheet-shaped prepregs 10 are further wrapped around the main body portion 112 and the convex portion 114 of the lower mold 110. A laminate 18A is obtained by pasting and laminating along the shape. Next, the laminate 18A is preformed to obtain a molding precursor 20A. Next, the molding precursor 20A is heat-pressed and compression-molded by a molding die composed of a lower die and an upper die forming a cavity having a shape complementary to the shape of the composite material molded body 1A to obtain the composite material molded body 1A. ..

Even when the composite material molded body has rounded corners, the thick flat plate portion among the flat plate portions having different wall thickness is formed by winding a strip-shaped prepreg many times without using a block body. In the manufacturing method of, there is a tendency for problems such as chipping at corners and resin-rich parts to occur. On the other hand, by compression molding using the molding precursor 20A containing the block body 14A, it is possible to suppress the prepreg from sinking due to the pressurization during compression molding, so that the corner portion of the obtained composite material molded body can be suppressed. It is possible to suppress the occurrence of chipping and the formation of resin-rich portions.

In addition, the method for producing a composite material molded product of the present invention may be a method that does not have a preliminary shaping step, as long as a molding precursor capable of compression molding can be obtained without performing preliminary shaping.
In the method for producing a composite material molded product of the present invention, molding precursors 20 and 20A may be formed without winding a band-shaped prepreg on the outside of the block bodies 14 and 14A.

In the method for producing the composite material molded body 1 described above, after the sheet-shaped prepreg 10 is attached, four plate-shaped long block bodies 14 are arranged around the convex portion 114 of the lower mold 110. , A method of arranging two L-shaped block bodies around the convex portion 114 of the lower mold 110 may be used. From the viewpoint of facilitating the manufacture of the block body, a method of arranging four plate-shaped long block bodies 14 around the convex portion 114 of the lower mold 110 is preferable.

The composite material molded product of the present invention may be a method for producing a composite material molded product having corners formed by two flat plate portions having the same thickness. However, the problem that the corners are chipped or resin-rich is that the corners are formed by two flat plates with different thicknesses, and the thickness direction of the thick flat plates is the mold closing of the molding mold. It is more likely to occur when intersecting directions, especially when they are orthogonal. Therefore, the present invention is particularly effective in such cases.

1,1A Composite material molded body 2 1st flat plate part 3 2nd flat plate part 4 Flange part 5 Square part 10,12 Prepreg 14,14A Block body 16,16A Square part 18,18A Laminated product 20,20A Molding precursor 110 Reform type lower mold 112 Main body 114 Convex part 200 Molding mold 201 Cavity 202 Corner 210 Upper mold 212 Concave 220 Lower mold 222 Main body 224 Convex part

Claims (2)

A method for producing a composite material molded product having corners by heating and pressurizing a molding precursor containing a sheet-shaped prepreg containing a reinforcing fiber and a matrix resin composition with a molding mold consisting of a pair of molds and compression molding. There,
The molding precursor having corners and containing a block body that does not flow during compression molding inside the prepreg is formed .
Compression molding is performed in a state where the corners of the block body are arranged at the corners forming the corners of the composite material molded body in the cavity of the molding die.
A method for producing a composite material molded product, wherein the block body contains a reinforcing fiber and a cured product of a thermosetting resin. The composite material molded body includes a first flat plate portion and a second flat plate portion thicker than the first flat plate portion, and the surface directions of the first flat plate portion and the second flat plate portion intersect with each other. , The corners are formed at the intersection,
The block body is included in a portion of the molding precursor that forms the second flat plate portion, and the molding precursor is molded so that the thickness direction of the portion and the mold closing direction of the molding mold intersect. The method for producing a composite material molded product according to claim 1, wherein the composite material molded product is compression-molded in a state of being arranged in.

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