CN-116997459-B - Method for producing fiber-reinforced resin article and fiber-reinforced resin article

Abstract

The present invention provides an advantageous improvement concerning a method of manufacturing a fiber-reinforced resin article at least a portion of which has a hollow structure. A method for producing a fiber-reinforced resin article includes a molding step of disposing a prepreg preform having a core inner package portion in which a fusible core made of a wax material is disposed in a press mold and heating the preform to obtain a cured product having a hollow structure portion, and a core removing step of removing the fusible core from the cured product. And forming a through hole in the prepreg preform at the core inner package portion, and inserting an elastomer plug into the through hole.

Inventors

• KAJI TAKASHI
• TAKANO TSUNE
• Motohata Takashi

Assignees

• 三菱化学株式会社

Dates

Publication Date

20260505

Application Date

20220318

Priority Date

20210415

Claims (20)

1. 1. A method for producing a fiber-reinforced resin, comprising a molding step of disposing a prepreg preform having a core inner package portion in which a fusible core made of a wax material is disposed in a press mold and heating the preform to obtain a cured product having a hollow structure, and a core removing step of removing the fusible core from the cured product, forming a through hole in the core inner package portion in the prepreg preform, and inserting an elastomer plug into the through hole.
2. 2. The method for producing a fiber-reinforced resin according to claim 1, wherein at least a part of the elastic plug is tapered, and a side having a large area of a cross section orthogonal to the insertion direction is inserted into the through hole toward the fusible core.
3. 3. The method for producing a fiber-reinforced resin according to claim 1 or 2, wherein the elastomer plug has a protrusion or a recess on a side surface.
4. 4. The method for producing a fiber-reinforced resin according to claim 1 or 2, wherein in the core removing step, one end of a metal tube is inserted into the elastic body plug and is penetrated therethrough, and all or a part of the wax material is discharged from a cavity formed in the hollow structure portion of the cured product through the metal tube.
5. 5. The method for producing a fiber-reinforced resin according to claim 4, wherein at least a part of the metal pipe is heated in the core removing step.
6. 6. The method for producing a fiber-reinforced resin according to claim 4, wherein the other end of the metal pipe is connected to a recovery vessel.
7. 7. The method for producing a fiber-reinforced resin according to claim 1 or 2, wherein in the core removing step, one end of a metal pipe is inserted into the elastic body plug and is penetrated therethrough, and a gas is introduced into a cavity formed in the hollow structure portion of the cured product through the metal pipe.
8. 8. The method for producing a fiber-reinforced resin according to claim 7, wherein the other end of the metal pipe is open to the atmosphere.
9. 9. The method for producing a fiber-reinforced resin according to claim 7, wherein the gas is pressurized.
10. 10. The method for producing a fiber-reinforced resin according to claim 1 or 2, wherein in the molding step, the wax material is softened in at least a part of the fusible core.
11. 11. The method for producing a fiber-reinforced resin according to claim 1 or 2, wherein in the molding step, the wax material is melted in at least a part of the fusible core.
12. 12. The fiber reinforced resin manufacturing method according to claim 10, wherein the fusible core has a first portion composed of a first wax material and a second portion composed of a second wax material incompatible with the first wax material, the second wax material not softening in the forming process.
13. 13. The method for producing a fiber-reinforced resin according to claim 12, wherein either one of the first wax material and the second wax material contains a hydrocarbon as a main component, and the other contains an organic compound having a polar group.
14. 14. The method for producing a fiber-reinforced resin according to claim 1 or 2, wherein the fusible core contains particles of a material having a property of generating heat under a high-frequency electromagnetic field.
15. 15. The method for producing a fiber-reinforced resin according to claim 1 or 2, wherein the fusible core contains particles of a material having a property of absorbing microwaves to generate heat.
16. 16. The fiber reinforced resin production method according to claim 1 or 2, wherein the fusible core is preheated before the molding process.
17. 17. The method for producing a fiber-reinforced resin according to claim 1 or 2, wherein the fusible core is arranged inside the core inner package portion without being covered with the outer skin in the prepreg preform.
18. 18. A method for producing a fiber-reinforced resin, comprising a molding step of disposing a prepreg preform having a core inner-package portion in which a fusible core made of a wax material is disposed in a press mold and heating the preform to obtain a cured product having a hollow structure, and a core removing step of removing the fusible core from the cured product, wherein a first through-hole and a second through-hole are formed in the core inner-package portion in the prepreg preform, a first elastomer plug is inserted into the first through-hole, and a second elastomer plug is inserted into the second through-hole.
19. 19. The method for producing a fiber-reinforced resin according to claim 18, wherein at least a part of each of the first elastic body plug and the second elastic body plug is tapered, and the first elastic body plug and the second elastic body plug are inserted into the through hole with a side having a large area of a cross section orthogonal to the insertion direction facing the fusible core.
20. 20. The fiber reinforced resin manufacturing method according to claim 18 or 19, wherein both of the first and second elastomer plugs have protrusions or depressions on the side surfaces.

Description

Method for producing fiber-reinforced resin article and fiber-reinforced resin article Technical Field The present invention relates generally to a method for producing a fiber-reinforced resin article and a fiber-reinforced resin article. The present application claims priority based on international application PCT/JP 2021/0110290 based on patent cooperation treaty, which is japanese patent application at month 22 of 2021, and japanese patent application publication No. 2021-069189 of japanese patent application at month 4 of 2021, which are official acceptance halls, and the contents of which are incorporated herein by reference. Background Fiber reinforced resins (FRP; fiber Reinforced Plastic) are used in various applications including reinforcing members (reinforcement) for automobiles. There is proposed a method of manufacturing a fiber reinforced resin article having a hollow structure by heating and curing a prepreg preform (pre preform) together with a core made of a wax material in a press mold (patent document 1). Prior art literature Patent literature Patent document 1 International publication No. 2018/079824 Disclosure of Invention Problems to be solved by the invention The present invention has an object to provide an advantageous improvement regarding a method for manufacturing a fiber-reinforced resin article having at least a part of a hollow structure portion by heating and curing a prepreg preform together with a core made of a wax material in a press mold. The object of the present invention includes providing a method useful in preventing expansion deformation of a hollow structure after completion of forming and opening of a press die. The problems to be solved by the embodiments of the present invention are sometimes disclosed in the present specification either explicitly or implicitly. Means for solving the problems In one embodiment of the present invention, there is provided a method for producing a fiber-reinforced resin, comprising a molding step of disposing a prepreg preform having a core-in-package portion in which a fusible core made of a wax material is disposed in a press mold and heating the prepreg preform to obtain a cured product having a hollow structure, and a core removing step of removing the fusible core from the cured product, forming a through hole in the core-in-package portion, and inserting an elastomer plug into the through hole. In another embodiment of the present invention, there is provided a method for producing a fiber-reinforced resin, comprising a molding step of disposing a prepreg preform having a core-in-package portion in which a fusible core made of a wax material is disposed in a press mold and heating the preform to obtain a cured product having a hollow structure, and a core removing step of removing the fusible core from the cured product, wherein a first through hole and a second through hole are formed in the core-in-package portion in the prepreg preform, a first elastic plug is inserted into the first through hole, and a second elastic plug is inserted into the second through hole. In another aspect of the present invention, there is provided a fiber-reinforced resin article including a hollow structure, a cavity formed in the hollow structure, a through hole passing from an inner space of the cavity to an outside, and an elastic plug for closing the through hole. Effects of the invention An advantageous improvement is provided regarding a method for manufacturing a fiber-reinforced resin article having a hollow structure at least in part by disposing a prepreg preform in a press mold together with a core made of a wax material and curing it. Drawings Fig. 1 is a flowchart of a method for manufacturing a fiber reinforced resin article according to an embodiment. Fig. 2 is a perspective view schematically showing a fiber-reinforced resin article. Fig. 3 is a cross-sectional view schematically showing a fiber-reinforced resin article. Fig. 4 is a cross-sectional view of a fusible core. Fig. 5 is a cross-sectional view of a prepreg preform manufactured in a state where a core is disposed therein. Fig. 6 is a cross-sectional view showing an elastomer plug inserted into a through hole in a prepreg preform manufactured in a state where a core is disposed inside. Fig. 7 is a cross-sectional view showing a state in which a prepreg preform is put into a mold together with a fusible core. Fig. 8 is a cross-sectional view showing a state in which a prepreg preform is put into a mold together with a fusible core. Fig. 9 is a view showing a case where one end of a metal pipe is inserted into an elastic body plug and penetrated therethrough, and wax is discharged from a cavity of a hollow structure portion of a fiber reinforced resin article into a recovery container through the metal pipe. Fig. 10 shows a case where the wax is discharged from the cavity into the recovery vessel through the other metal pipe penetrating the other elastic stopper whil