JPH08230053A - Production of fiber reinforced molded product - Google Patents

Abstract

PURPOSE: To prevent the generation of voids in a molded product by injecting a liquid resin into a reinforcing fiber material so that the permeability of the reinforcing fiber material with the liquid resin in its surface direction becomes larger than that in its thickness direction before performing mold clamping and compression molding. CONSTITUTION: A reinforcing fiber material 40 is arranged to the wall surface 22 of a lower mold 20. At this time, a mold surface 12 is in contact with the reinforcing fiber material 40. Subsequently, a liquid resin 60 is supplied to a resin supply passage 16 to be allowed to fall from the resin supply passage 16 opened to the rear surface of an upper mold 20 to be injected into the lower mold 20. Next, the upper mold 10 is allowed to fall to be clamped to the lower mold 20. The mold surface 12 of the upper mold 10 and the mold surface 22 of the lower mold 20 come into contact with each other and the mold register surfaces 14, 24 of both molds come into contact with each other through a packing 30. Herein, a mold clamping speed is adjusted so that the permeability of the reinforcing material 40 with the liquid resin 60 in its surface direction becomes larger than that in its thickness direction and the reinforcing fiber material 40 containing the liquid resin is compressed at this mold clamping speed to be heated under pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber-reinforced resin molded article, and more particularly to a method for producing a fiber-reinforced resin molded article in which a reinforced fiber material is impregnated with a liquid resin and is pressed.

[0002]

2. Description of the Related Art One of the methods for producing a fiber-reinforced resin molded product is to use a pair of male and female molds. in this way,
A reinforcing fiber material is placed in a molding die, and the reinforcing fiber material is impregnated with a liquid resin such as an epoxy resin, and then the molding die is clamped, pressurized and heated at the same time. As a result, a fiber-reinforced resin molded product having an outer shape corresponding to the shape of the molding die is obtained. As the reinforcing fiber material, for example, a sheet-shaped material composed of a fiber bundle obtained by hardening glass fiber or the like as a reinforcing material with a binder resin is used.

However, according to the conventional method, voids are often generated in the obtained molded products, and the molded products must be inspected one by one, or many molded products that are not put to practical use are manufactured. There is a problem such as. In order to solve the above problems, a method for improving the resin impregnating ability into a reinforcing fiber material is disclosed in Japanese Patent Laid-Open No. 316811/1992. In this method, first, a reinforcing fiber material is arranged in a mold. Next, the liquid resin is injected with the upper and lower molds being set at a distance larger than the thickness of the product, and heating and curing are performed after the injection is completed. According to this method, the resin is easily injected and the resin is easily impregnated in the reinforcing fiber material,
Due to the shut-off speed, ring-shaped voids are likely to be formed on the upper surface of the molded product, and the mechanical properties of the molded product deteriorate.

[0004]

The problem to be solved by the present invention is to prevent the occurrence of voids in a molded product and obtain a molded product with good quality performance. Another problem to be solved by the present invention is to make it easier for the liquid resin to spread over the entire molded article.

Still another problem to be solved by the present invention is to prevent the formation of voids on the resin injection port side of a molded product.

[0006]

A method for producing a fiber-reinforced resin molded product, which is one aspect of the present invention, uses a molding die in which an upper die and a lower die are provided so as to be openable and closable, and the following (a) to ( A method for producing a fiber-reinforced resin molded product, which comprises sequentially performing step c),
Permeability of liquid resin reinforced fiber material in the surface direction (hereinafter simply referred to as surface permeability) rather than thickness direction permeability of liquid resin reinforced fiber material (hereinafter simply referred to as thickness direction penetrability)
Is characterized in that

(A) Arranging step of arranging the reinforcing fiber material in the lower mold (b) Liquid resin impregnating step of impregnating by injecting liquid resin into the reinforcing fiber material by setting the mold opening amount and then clamping the mold. c) Molding and hardening step of compressing and hardening the reinforcing fiber material impregnated with the liquid resin In the liquid resin impregnating step, it is possible to adjust the mold clamping speed between the upper mold and the lower mold so that the permeability in the thickness direction is higher than the permeability. It may be characterized in that the permeability in the plane direction is increased.

The reinforcing fiber material arranged in the arranging step may be characterized in that its permeability in the plane direction is greater than that in the thickness direction. The reinforcing fiber material arranged in the arrangement step has a reinforcing fiber material closer to the liquid resin injection port formed in at least one of the upper mold and the lower mold as viewed in the thickness direction thereof, in the thickness direction thereof. May have a smaller permeability.

The reinforced fiber material arranged in the arranging step is closer to the liquid resin injection port formed in at least one of the upper mold and the lower mold in the thickness direction,
It may be characterized in that the basis weight is larger. The arranging step may be a step of setting the mold opening amount of the reinforcing fiber material within a range in which the permeability in the thickness direction does not become larger than the permeability in the surface direction.

According to another aspect of the present invention, there is provided a method for producing a fiber-reinforced resin molded article, which uses a molding die in which an upper die and a lower die are provided so as to be openable and closable, and includes steps (a) to (e) below. A method for sequentially producing a fiber-reinforced resin molded product, characterized in that the surface of the base material on the injection port side is coated. (A) Arrangement step of arranging the reinforcing fiber material in the lower mold (b) Liquid resin impregnation step of setting the mold opening amount and injecting the liquid resin into the reinforcing fiber material, and then impregnating the resin by clamping the mold (c) First molding and curing step of compressing and hardening the reinforcing fiber material impregnated with the liquid resin (d) Injecting coating material onto the surface of the base material (e) Closing the lower mold and the upper mold Second Molding and Curing Step of Compressing and Heating a Base Material Containing a Coating Material to Mold and Cure The present invention will be described in detail below.

The reinforcing fiber material used in the present invention is composed of a fiber bundle obtained by hardening fibers as a reinforcing material with a binder resin. Fibers as the reinforcing material include, for example, inorganic materials such as glass, fused silica, silicon carbide, carbon, boron nitride, alumina, zirconia, aluminum, copper, titanium and stainless steel, and organic materials such as nylon, Examples thereof include aromatic polyamides, which may be used alone or as a mixture of two or more different materials. Examples of the shape of the reinforcing fiber material include a woven shape, a knitted shape, a chopped strand mat cut into an average fiber length of 5 to 30 mm, a non-woven fabric, a sheet shape in which fiber bundles are randomly entangled, a felt shape, and the above. The shape is a three-dimensionally configured laminated shape, a mat shape, or the like, and may be used alone, or two or more different shapes may be used in combination. In order to improve the operability, the reinforcing fiber material is preferably deformed to have a shape corresponding to the shape of the mold cavity.

Examples of the liquid resin include polyester resins, unsaturated polyester resins, epoxy resins, diarylphthalate resins, phenol resins,
Vinyl ester resin, acrylic resin, etc. are used. In the present invention, when comparing the penetrability in the thickness direction and the penetrability in the plane direction, for example, the value represented by the following formula can be used.

Kz = 62Φ ³ / (1−Φ) ² where Kz is the value indicating the permeability in the thickness direction (1) Kx = 241v + 40exp (5.45Φ) where Kx is the value indicating the permeability in the plane direction (2) Here, v represents the flow velocity of the liquid resin, and Φ represents the porosity of the reinforcing fiber material. The liquid resin flow velocity referred to here is D1 which is the diameter of the resin filling region of the reinforcing fiber material formed at the time of resin injection, and D2 is the diameter of the resin filling region which is formed T seconds after mold clamping. In this case, the value is defined by the formula (3) below, and the value changes depending on the mold clamping speed of the upper mold and the lower mold.

D2 = D1 + 2vT (3) In the present invention, Kz calculated from the above equation is compared with Kx, and the mold clamping speed is adjusted so that Kx> Kz.
Further, the use of the reinforcing fiber material with Kx> Kz suppresses the generation of voids. In the present invention, in particular, in order to suppress the occurrence of voids on the surface of the fiber reinforced plastic, a reinforced fiber material is impregnated with a liquid resin, which is compressed, and a molded product obtained by molding and curing is used as a base material. A coating material is injected onto the surface, and this is compressed and heated to mold and cure.

As the coating material, the same materials as those mentioned above that can be used for molding the base material can be used. The coating material may be injected under reduced pressure, atmospheric pressure or increased pressure. In addition, the injection port of the coating material may be provided at one place on the upper mold or at a plurality of places. Furthermore, when the coating material is injected into the surface of the fiber-reinforced resin molded product from a plurality of injection ports, each resin injection direction may be the same direction,
The directions may be substantially perpendicular to each other.

The liquid resin impregnation step can be carried out under reduced pressure, normal pressure or increased pressure.
Further, the liquid resin injection port may be provided at one place or at a plurality of places, but it is generally preferable to have a plurality of places so that the liquid resin is spread to every corner of the mold cavity. . The position of the liquid resin injection port may be only in one of the upper mold and the lower mold, or may be in both of them, but in general, the liquid resin may be provided in both of them in order to spread the liquid resin to every corner of the mold cavity. preferable. When the liquid resin is injected into the mold cavity from a plurality of resin injection ports, the resin injection directions of the respective injection ports may be the same direction or may be the opposite directions. Further, the resin injection directions may be substantially perpendicular to each other.

As the mold used in the present invention, a mold whose upper mold is convex may be used, and a mold whose lower mold is convex may be used. In addition, the molding conditions can adopt the same range as the manufacturing conditions of ordinary fiber reinforced resin molded products, and the pressing force, heating temperature, curing time, etc. can be changed according to the type of liquid resin and the shape of molded products. . In the present invention, in order to prevent the occurrence of voids in the molded product, (a) the mold clamping speed is adjusted, (b) a reinforcing fiber material with Kx> Kz is used, and (c) a coating film on the base material. We have proposed three means of forming. These means may be used alone, or two or more means may be used in combination.

[0018]

In the conventional method for manufacturing a fiber-reinforced resin molded product, the mold clamping is performed without considering the permeability of the liquid resin into the reinforcing fiber material. Kz used as an example of the present invention is determined by the porosity of the reinforcing fiber material, but Kx is changed by changing the flow rate of the liquid resin depending on the mold clamping speed. K
It is considered that voids are easily formed when z is larger than Kx. The relationship between porosity and permeation coefficient is shown in FIG.

The porosity varies depending on the kind of the reinforcing fiber material. Even when Kx <Kz at the time of resin injection, if the porosity decreases as the injection proceeds, the magnitude relationship between Kx and Kz as shown in FIG. Is reversed. Further, as shown in FIG. 1, the time required for reversing the magnitude relationship between Kx and Kz differs depending on whether the mold clamping speed is high or the mold clamping speed is low, and voids may occur depending on the mold clamping speed. There may be no.

Therefore, according to the present invention, (1) the mold clamping speed is adjusted in the liquid resin impregnation step, and (2) the reinforcing fiber material with Kx> Kz is used. The permeability in the plane direction should be greater than the permeability in the direction. As yet another means, the formation of voids is suppressed by coating the surface of the base material on the injection port side of the liquid resin.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for producing a fiber-reinforced resin molded product of the present invention will be described below with reference to the drawings. In an example of the method for producing a fiber-reinforced resin molded product according to the present invention, the following [molding die] is used, and then, [arrangement step], [liquid resin impregnation step], [molding and curing step], [demolding step] ] The steps are sequentially performed. [Molding Mold] As shown in FIG. 2, each of the molding dies includes an upper mold 10 and a lower mold 20 made of metal. The lower mold 20 has a mold surface 22 which is arranged upward and whose center is recessed into a trapezoidal cross section. The outer periphery of the mold surface 22 has a flat mold matching surface 24 extending in the horizontal direction. Silicon packing 30 is provided on the mold matching surface 24 along the entire circumference.

The upper die 10 has a die surface 12 which is arranged downward and whose center is projected in a trapezoidal cross section. The mold surface 12 has a shape corresponding to the mold surface 22 of the lower mold 20. As shown in FIG. 4, in the mold clamped state, the mold surface 12 of the upper mold 10 is in close contact with the mold surface 22 of the lower mold 20 with only a slight clearance in the side surface portion. Mold surface 12 and mold surface 22
There is a space between the upper and lower facing surfaces of the above, and this space becomes a molding space.

An outer peripheral portion of the die surface 12 of the upper die 10 has a flat die mating surface 14 extending in the horizontal direction. In the mold-closed state, the mold-matching surface 14 of the upper mold 10 and the mold-matching surface 24 of the lower mold 20 are in contact with each other with the packing 30 sandwiched therebetween, and the liquid resin is prevented from leaking out of the mold during pressure molding. The upper mold 10 has a resin supply passage 16. The resin supply path 16 has one end opening downward in the center of the mold surface 12 and the other end opening on the side surface of the upper mold 10. As shown in FIG. 3, the opening of the resin supply passage 16 arranged on the side surface of the upper mold 10 is connected to the resin supply device 50 via a pipe 52 and a hose.

The steps of manufacturing a fiber-reinforced resin molded product using the above-described molding die will be sequentially described. [Arrangement Step] As shown in FIG. 2, a reinforcing fiber material 40 made of a continuous glass fiber mat is arranged in the mold surface 22 of the lower mold 20. At this time, the mold surface 12 is in contact with the reinforcing fiber material 40. The distance between the upper mold 10 and the lower mold 20 is equal to the mold surface 22 of the lower mold 20.
The setting is made so that the arranging work of the reinforcing fiber material 40 can be easily performed. The outer shape of the reinforcing fiber material 40 is formed according to the inner peripheral shape of the mold surface 22 of the lower mold 20. [Liquid Resin Impregnation Step] As shown in FIG. 3, a liquid resin 60 such as an epoxy resin is supplied from the resin supply device 50 to the resin supply passage 16 of the upper mold 10 through the resin supply pipe 52. The liquid resin 60 is applied to the resin supply path 1 that opens at the lower surface of the upper mold 10.
It drops from 6 and is injected into the mold surface 22 of the lower mold 20. The liquid resin 60 is impregnated in the reinforcing fiber material 40 and spreads over the entire inner circumference of the mold surface 22. Since the liquid resin 60 is dammed by the outer periphery of the concave mold surface 22, there is no risk of leaking to the outside. [Molding and Hardening Step] As shown in FIG. 4, the upper mold 10 is lowered with respect to the lower mold 20 and clamped. Mold surface 12 of upper mold 10
And the die surface 22 of the lower die 20 are in contact with each other at the side surface, and the die mating surface 14
And the mold matching surface 24 are in contact with each other via the packing 30. There is a space H0 between the mold surface 12 of the upper mold 10 and the mold surface 22 of the lower mold 20. In this embodiment, the distance H0 is set to 3 mm.

In this embodiment, the reinforcing fiber material 40 having a porosity of 0.9291 is used, and the mold clamping speed is 20.
When set to mm / s, Kx = 6844, Kz = 6833
Becomes The reinforcing fiber material 40 containing the liquid resin 60 is compressed at this mold clamping speed, and a pressure of 1.3 MPa is applied in the mold clamped state. Further, the mold temperature is heated to 130 ° C., and the curing time of the liquid resin is set to 30 minutes.

As a result, the mold surface 12 of the upper mold 10 and the lower mold 20.
The liquid resin 60 is integrated with the reinforcing fiber material 40 between the mold surface 22 and the mold surface 22, and is molded and cured to obtain a fiber-reinforced resin molded product. [Demolding Step] As shown in FIG. 5, the upper mold 10 is pulled upward from the lower mold 20 to open the mold. In the mold surface 22 of the lower mold 20, a fiber-reinforced resin molded product M molded into a predetermined shape is obtained.

In the above-mentioned embodiment, the mold clamping speed is adjusted to establish the relationship of Kx> Kz, so that voids are unlikely to occur in the molded product M, and a molded product having an excellent strengthening function can be obtained. -Other Examples- (A) Another example will be described.

In this example, the reinforcing fiber material under the following conditions was used. Unit weight: 600 g / m ² Reinforcing fiber mass: 180 g when 6 sheets are laminated (density ρ = 2.54
g / cm ³ ) Porosity: 0.8 Kx = 5600 cm ² , Kz = 1000 cm ² (value when mold clamping speed is 5 mm / min) Mold injection speed is set to 100 mm / min, 5 mm / min, and injection The same operation as in the above example is performed except that the hour die opening amount is set to 7 mm.

In the above-mentioned embodiment, since the reinforcing fiber material having the porosity such that Kx> Kz is arranged, voids are unlikely to be generated in the molded product M regardless of the mold clamping speed,
A molded product with an excellent strengthening function can be obtained. (B) Another embodiment is shown. In this example, except that the reinforcing fiber material under the following conditions was used, the above example (A) was used.
Perform the same operation as.

Weight per unit area: 450 g / m ² Mass of reinforcing fiber: 135 g when 6 sheets are laminated (density ρ = 2.54
g / cm ³ ) Porosity: 0.85 Kx = 6700 cm ² , Kz = 1900 cm ^{2 In the} above-mentioned examples, since the reinforcing fiber material having the porosity such that Kx> Kz is arranged, the mold clamping speed is set. Regardless of the above, voids are unlikely to occur in the molded product M, and a molded product having an excellent strengthening function can be obtained.

(C) Another embodiment will be described. In this example, the same operation as in Example (A) above is performed except that the reinforcing fiber material under the following conditions is used. Unit weight: 300 g / m ² Reinforcing fiber mass: 135 g when 6 sheets are laminated (density ρ = 2.54
g / cm ³ ) Porosity: 0.9 Kx = 8100 cm ² , Kz = 4300 cm ^{2 In the} above-mentioned examples, since the reinforcing fiber material having the porosity such that Kx> Kz is arranged, the mold clamping speed is set. Regardless of the above, voids are unlikely to occur in the molded product M, and a molded product having an excellent strengthening function can be obtained.

(D) FIG. 6 shows another embodiment. In this embodiment, the reinforcing fibers 41, which have been binder-removed in advance in an electric furnace, are arranged on the reinforcing fibers 40 arranged in the mold surface 22 of the lower mold 20 in the arrangement step. The mold clamping speed is set to 100 mm / min and 5 mm / min, and the mold opening amount is 6 m.
m, 9 mm 15 mm The same operation as in the above example is performed except that the setting is made.

Kx and Kz when the resin material is injected
Each was ^{Kx = 55cm 2, Kz = 30cm} 2. In the above-mentioned examples, since the reinforcing fiber material having a smaller porosity is arranged at a position closer to the resin injection port side in a range in which the material or the like does not significantly change, the molded product does not depend on the mold opening amount and the mold clamping speed. Voids are unlikely to occur in M, and a molded product having an excellent strengthening function can be obtained.

(E) FIG. 7 shows another embodiment. In this embodiment, the reinforcing fiber materials 40a, 40b, 40c are arranged in the mold surface 22 of the lower mold 20 so that the weight per unit area (g / mm ² ) becomes larger at a position closer to the resin injection port 16a in the arrangement process. ing. In this example, the reinforcing fiber material under the following conditions is used.

40a: Randomly oriented continuous glass fiber mat (weight per unit area: 600 g / m ² ) (porosity: 0.8, Kx = 5600 cm ² , Kz = 100)
0 cm ² ) 40b: Random orientation continuous glass fiber mat (weight per unit area:
450 g / m ² ) (porosity: 0.85, Kx = 6700 cm ² , Kz = 19
00 cm ² ) 40c: Random orientation continuous glass fiber mat (weight per unit area:
300g / m ² ) (Porosity: 0.9, Kx = 8100cm ² , Kz = 430
0 cm ² ) The same operation as in Example (D) was performed except that the mold clamping speed was set to 100 mm / s and 5 mm / s.

In the above-mentioned embodiments, the reinforcing fiber materials having different basis weights are laminated. Generally, the smaller the basis weight, the lower the ratio of the reinforcing fiber material in the unit volume and the higher the porosity. If a reinforcing fiber material with a larger basis weight is placed closer to the resin injection port side, the porosity becomes smaller at the position closer to the resin injection port side, so voids are less likely to occur at the sudden permeability change portion in the thickness direction. . As a result, voids are unlikely to occur in the molded product M regardless of the mold opening amount and the mold clamping speed, and a molded product having an excellent strengthening function can be obtained.

(F) Another embodiment will be described. In this embodiment, the mold opening amount during resin injection is adjusted in the placement step so that the relationship of Kx> Kz is established. Here, the mold opening amount is a distance H1 (see FIG. 3) from the lower end of the mold surface 12 to the bottom surface of the mold surface 22. Mold opening amount 6mm, 12mm1
The same operation as in the above-mentioned Example (E) is performed except that it is set to 8 mm.

As a result, when the mold opening amount was set so that Kx> Kz, no void was generated on the surface of the obtained fiber reinforced plastic, but Kx <Kz.
When the mold opening amount was set to be (and), voids were generated on the surface of the obtained fiber reinforced plastic. In the above-described embodiment, the mold opening amount is adjusted so that Kx> K.
Since the relationship of z is established, a void is unlikely to occur in the molded product M regardless of the mold clamping speed, and a molded product having an excellent strengthening function can be obtained.

(G) FIG. 8 shows another embodiment. In this embodiment, the upper mold 10 has a coating material supply unit 17. One end of the coating material supply unit 17 has a resin supply port 16a of the mold surface 12.
And a downward opening is formed between the end of the upper die 10 and the side surface of the upper die 10. As shown in FIG. 8, the other end of the coating material supply unit 17 is
It is connected to the tree coating material supply device 70 via a pipe 72 and a hose.

Further, as shown in FIG. 9, the upper mold 10 is pulled upward with respect to the lower mold 20 to open the mold. Lower mold 20
In the mold surface 22, the surface on the resin injection port 16a side is covered with the coating material 80, and the fiber-reinforced resin molded product M molded in a predetermined shape is obtained. In this example, the reinforcing fiber material under the following conditions is used. Reinforcing fiber material: Randomly oriented continuous glass fiber mat Resin: Unsaturated polyester resin Coating material: Vinyl ester resin Mass of reinforcing fiber: 135g when 6 sheets are laminated (density ρ = 2.5
4 g / cm ³ ) Cavity shape: 250 mm × 200 mm × 3 mm After placing the reinforcing fiber material 40 in the mold surface 22 of the lower mold 20 under the above conditions, the liquid resin 60 is injected as shown in FIG. Next, as shown in FIG.
After clamping the mold at 0 mm / min and 5 mm / min, press it under the compression condition of 1.3 MPa and press the mold to 130
The temperature is set to 0 ° C. and heat curing (primary curing) is performed for 12 minutes.
After heat curing, the mold is opened and the coating material 80 is injected. Furthermore, the mold clamping speed was set to 1 mm / min, the mold was clamped, and the mold was compressed under a compression condition of 1.3 MPa, and then the mold was set to 130 ° C. and heat-cured (secondary curing) for 18 minutes. To do.

As a result, no void was generated on the surface of the obtained fiber reinforced plastic regardless of the mold clamping speed. In the embodiment described above, the resin injection port 1 of the molded product M is used.
Since the surface on the 6a side is covered with the coating material 80, voids are unlikely to occur on the surface of the molded product M on the resin injection port 16a side regardless of the mold clamping speed, and a molded product having an excellent strengthening function can be obtained. .

[0042]

EFFECTS OF THE INVENTION According to the method for producing a fiber-reinforced resin molded product according to the present invention, the mold clamping speed is adjusted in the molding and curing step so that the liquid resin has a higher surface permeability than the reinforcing fiber material in the thickness direction. The directional permeability can be increased. As a result, it is possible to prevent the occurrence of voids in the molded product and obtain a molded product with good quality performance.

According to another method for producing a fiber-reinforced resin molded product according to the present invention, the porosity of the reinforcing fiber material is focused on in the arranging step, and the surface of the liquid resin is better than the permeability of the reinforcing fiber material in the thickness direction. By using the reinforcing fiber material having a large directional permeability, the liquid resin can be easily spread over the entire molded article. According to still another method for producing a fiber-reinforced resin molded product according to the present invention, by coating the surface of the base material obtained by molding and curing once on the injection port side with a coating material, the resin injection of the molded product can be performed. It is possible to prevent the formation of voids on the inlet side.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between the porosity of a reinforcing fiber material and the permeation coefficient.

FIG. 2 is a cross-sectional view showing an example of a reinforcing fiber material arranging step.

FIG. 3 is a cross-sectional view showing an example of a liquid resin impregnation process of a liquid resin.

FIG. 4 is a cross-sectional view showing an example of a molding and curing process of a liquid resin.

FIG. 5 is a sectional view showing an example of a mold releasing process of a molded product.

FIG. 6 is a cross-sectional view showing an example of a step of arranging a reinforcing fiber material.

FIG. 7 is a cross-sectional view showing an example of a step of arranging a reinforcing fiber material.

FIG. 8 is a sectional view showing an example of a coating material injection step.

FIG. 9 is a cross-sectional view showing an example of a mold releasing process of a molded product.

[Explanation of symbols]

 10 Upper mold 12 Mold surface 20 Lower mold 22 Mold surface 40 Reinforcing fiber material 60 Liquid resin M Fiber reinforced resin molded product

Claims (7)

[Claims] 1. A molding die in which an upper die and a lower die are provided so as to be openable and closable, (a) an arranging step of arranging a reinforcing fiber material in the lower die, and (b) setting the die opening amount to perform the reinforcement. Liquid resin impregnation step of injecting the liquid resin into the fibrous material and then impregnating it by mold clamping (c) Each step of the molding and curing step of compressing and hardening the reinforced fiber material impregnated with the liquid resin is sequentially performed. A method for manufacturing a fiber-reinforced resin molded article, wherein the permeability of the liquid resin in the plane direction of the reinforcing fiber material is greater than the permeability of the liquid resin in the thickness direction of the reinforcing fiber material. A method for producing a fiber-reinforced resin molded article, comprising: 2. In the liquid resin impregnation step, the penetrability in the surface direction is made larger than the penetrability in the thickness direction by adjusting the mold clamping speed of the upper mold and the lower mold. The method for producing a fiber-reinforced resin molded product according to claim 1, characterized in that. 3. The fiber according to claim 1, wherein the reinforcing fiber material arranged in the arranging step has greater permeability in its surface direction than in its thickness direction. Manufacturing method of reinforced resin molded product. 4. The reinforcing fiber material arranged in the arranging step has a position close to an injection port of the liquid resin formed in at least one of the upper mold and the lower mold when viewed in a thickness direction thereof. The method for producing a fiber-reinforced resin molded article according to claim 1, wherein the reinforcing fiber material has a smaller permeability in the thickness direction. 5. The reinforced fiber material arranged in the arranging step is closer to a liquid resin injection port formed in at least one of the upper mold and the lower mold in the thickness direction thereof. The method for producing a fiber-reinforced resin molded article according to claim 1, wherein the basis weight is larger. 6. The liquid resin impregnation step is a step of setting a mold opening amount of the reinforcing fiber material in a range in which the permeability in the thickness direction does not become larger than the permeability in the surface direction. The method for producing a fiber-reinforced resin molded article according to claim 1. 7. A molding die in which an upper die and a lower die are provided so as to be openable and closable, (a) an arranging step of arranging a reinforcing fiber material in the lower die, and (b) setting the die opening amount to perform the reinforcement. Liquid resin impregnation step of injecting liquid resin into the fiber material and then impregnating it by mold clamping (c) First molding and curing step of compressing and hardening the reinforced fiber material impregnated with the liquid resin (d) A coating material injecting step of injecting a coating material onto the surface of the base material on the inlet side of the liquid resin (e) clamping the lower mold and the upper mold, and compressing and heating the base material containing the coating material. A method for manufacturing a fiber-reinforced resin molded product, which sequentially performs the respective steps of a second mold-curing step of molding and curing, wherein the fiber-reinforced resin molded product is characterized in that the surface of the base material on the injection port side is covered. Manufacturing method.