JP2010221489A - Rtm molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an RTM molding method which prevents the occurrence of a resin sink in advance, and can improve the surface quality of a fiber-reinforced resin component. <P>SOLUTION: A prepreg 2 impregnated with resin in advance is mounted to a molding surface formed in a lower mold 11 of a mold 10, a reinforcing fiber laminate 3 not impregnated with the resin is mounted to the prepreg 2, and the prepreg 2 impregnated with the resin in advance is mounted to the reinforcing fiber laminate 3. The lower mold 11 and an upper mold 12 of the mold 10 are clamped, and the resin is injected into the mold 10 to make the reinforcing fiber laminate 3 impregnated with the resin. After that, the resin which has penetrated the reinforcing fiber laminate 3 in the mold 10 and the resin of the prepreg 2 are heated and cured. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an RTM molding method for molding a fiber reinforced resin part, and more particularly to an RTM molding method capable of improving the surface quality of a fiber reinforced resin part.

  Fiber Reinforced Resin (FRP) parts are made by impregnating and curing a thermosetting resin or a matrix resin of thermoplastic resin on a reinforced fiber substrate made of carbon fiber, glass fiber, etc., and it is lightweight and has strength characteristics It is used in many fields because of its superiority.

  One method for producing fiber-reinforced resin parts is an RTM molding method. For example, in Patent Document 1, a reinforcing fiber base made of a laminate of reinforcing fiber bundles is placed in a cavity of a mold having a smooth molding surface, and resin is injected into the cavity to impregnate the reinforcing fiber base. And an RTM molding method for obtaining a fiber-reinforced resin part by curing the resin after impregnation.

Japanese Patent Application No. 2007-269015

  However, in the conventional method, the resin shrinks as the resin hardens in the mold, and the resin sinks in which the resin impregnated in the outermost layer of the reinforcing fiber base flows inward of the reinforcing fiber base occurs. To do. Therefore, for example, a regular dent is formed on the surface of the fiber reinforced resin part according to the texture or arrangement period of the reinforcing fiber bundle, or the outermost reinforcing fiber bundle of the fiber reinforced resin part is exposed to the outside. There is a problem that the appearance quality of the fiber reinforced resin part is deteriorated, for example, an unimpregnated portion is formed.

  This invention is made | formed in view of the said problem, The objective is preventing the generation | occurrence | production of a resin sink and providing the RTM molding method which can improve the surface quality of a fiber reinforced resin component.

  The RTM molding method of the present invention for solving the above problems is an RTM molding method for molding a fiber reinforced resin part using a molding die, in which a prepreg impregnated with a resin in advance is formed on the lower die of the molding die. A first step of placing on the surface, a second step of placing the reinforcing fiber laminate not impregnated with the resin on the prepreg, and a first step of placing the prepreg impregnated with the resin on the reinforcing fiber laminate in advance. Step 4, the fourth step of clamping the lower and upper molds of the mold, injecting the resin into the mold, and impregnating the resin into the reinforcing fiber laminate, and laminating the reinforcing fibers in the mold It includes a resin impregnated in the body and a fifth step of heating and curing the resin of the prepreg.

  According to the present invention, the prepreg is arranged on the outermost layer forming the surface of the fiber reinforced resin component and the fiber reinforced resin component is RTM molded. Therefore, when the resin impregnated in the reinforced fiber substrate is cured and contracted. The resin impregnated in the outermost prepreg does not flow out from the prepreg toward the reinforcing fiber laminate, and it is possible to prevent the resin sink from occurring on the surface of the fiber reinforced resin component. Therefore, the surface of the fiber reinforced resin component can be a smooth surface along the molding surface of the mold, and good surface quality can be obtained.

Sectional drawing of the fiber reinforced resin component shape | molded by the RTM shaping | molding method concerning this Embodiment. The figure explaining the RTM shaping | molding method of the fiber reinforced resin component concerning this Embodiment. The figure explaining the RTM shaping | molding method of the fiber reinforced resin component concerning this Embodiment. The figure explaining the RTM shaping | molding method of the fiber reinforced resin component concerning this Embodiment. The figure explaining the RTM shaping | molding method of the fiber reinforced resin component concerning this Embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings.

  First, the RTM molding method of the fiber reinforced resin part 1 according to the present embodiment will be described with reference to FIGS.

  First, as shown in FIG. 2, the prepreg 2 is placed on the smooth molding surface formed on the lower mold 11 of the mold 10 (first step). The prepreg 2 is configured by, for example, pre-impregnating a reinforcing fiber base material with a matrix resin such as an epoxy resin. For the reinforcing fiber base material of the prepreg 2, for example, glass fiber, carbon fiber, aramid fiber or the like is used.

  Next, as shown in FIG. 3, the reinforcing fiber laminate 3 is placed on the prepreg 2 (second step). The reinforcing fiber laminate 3 is configured by laminating a dry reinforcing fiber base material not impregnated with a resin so as to have a preset plate thickness.

  Then, as shown in FIG. 4, the prepreg 2 is placed on the reinforcing fiber laminate 3 (third step). Then, as shown in FIG. 5, the upper mold 12 of the mold 10 is closed and clamped, a matrix resin is injected into the mold 10, and the reinforcing fiber laminate 3 is impregnated with the matrix resin (fourth process) Process). After the impregnation, the matrix resin of the prepreg 2 in the mold 10 and the matrix resin impregnated in the reinforcing fiber laminate 3 are heated and cured (fifth step), and the fiber reinforced resin component 1 is molded. .

  FIG. 1 is a cross-sectional view of a fiber reinforced resin component 1 molded by the RTM molding method according to the present embodiment.

  As shown in FIG. 1, the fiber reinforced resin component 1 has a prepreg cured layer 6 formed as an outermost layer on both surfaces of the RTM cured layer 5. The prepreg cured layer 6 is configured by curing the matrix resin pre-impregnated in the prepreg 2, and the RTM cured layer 5 is configured by curing the resin impregnated in the reinforcing fiber laminate.

  According to the RTM molding method described above, the prepreg 2 is disposed on the outermost layer that forms the surface of the fiber reinforced resin component 1 to mold the fiber reinforced resin component 1, so that the reinforced fiber laminate 3 that forms the RTM cured layer 5. When the resin impregnated in is hardened and contracted, the resin pre-impregnated in the prepreg 2 does not flow out from the prepreg 2 toward the reinforcing fiber laminate 3, and the resin is not applied to the surface of the fiber reinforced resin component 1. The occurrence of sink marks can be prevented. Therefore, the surface of the fiber reinforced resin component 1 can be a smooth surface along the molding surfaces of the lower mold 11 and the upper mold 12, and good surface quality can be obtained.

  When the reinforcing fiber laminate 3 is made of CFRP, electrical insulation can be added to the fiber reinforced resin component 1 by using the prepreg 2 in which the reinforcing fiber substrate is made of glass fiber. Corrosion due to electric corrosion can be prevented.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the case where the prepreg 2 is laminated on both surfaces of the reinforcing fiber laminate 3 forming the RTM cured layer 5 has been described as an example, but only one surface of the reinforcing fiber laminate 3 may be used. That is, when only one side of the fiber reinforced resin component 1 is the surface, the prepreg 2 is laminated only on the one side, and the one side of the fiber reinforced resin component 1 is molded into the lower mold 11 or the upper mold 12. It is good also as a smooth plane along a surface.

DESCRIPTION OF SYMBOLS 1 Fiber reinforced resin part 2 Prepreg 3 Reinforced fiber laminated body 5 RTM layer 6 Prepreg cured layer

Claims (1)

An RTM molding method for molding a fiber-reinforced resin part using a molding die,
A first step of placing a prepreg impregnated with a resin on a molding surface formed on a lower mold of a molding die;
A second step of placing a reinforcing fiber laminate not impregnated with resin on the prepreg;
A third step of placing a prepreg impregnated with a resin on the reinforcing fiber laminate;
A fourth step of clamping the lower mold and the upper mold of the mold, injecting resin into the mold, and impregnating the reinforcing fiber laminate with resin;
A resin in which the reinforcing fiber laminate is impregnated in the mold, and a fifth step of heating and curing the resin of the prepreg;
An RTM molding method for fiber-reinforced resin parts, comprising:

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