JP2006130734A - Honeycomb sandwich panel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a honeycomb sandwich panel capable of being especially used for easily manufacturing a large sized fiber reinforced plastic panel in which a frequency selective panel is incorporated, and its manufacturing method. <P>SOLUTION: The honeycomb sandwich panel is constituted by laminating frequency selective panels 3, which transmit or cut off specific frequency, on the upper and under surfaces of a honeycomb core 1 molded from a nonmetal material through a film-like adhesive 2 comprising an epoxy adhesive material and integrally laminating fiber reinforced resin sheets 4 on the surfaces of the frequency selective panels 3. The honeycomb core 1 is constituted of one material selected from an aromatic polyamide [Nomex (R)], a resin material, a foam material, a syntactic foam and wood being a nonmetal material and each of the frequency selective panels 3 is formed of a light metal panel and used by forming various through-holes to the light metal panel with various thicknesses in order to transmit or cut off the specific frequency. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a honeycomb sandwich panel in which frequency selective plates are laminated and a method of manufacturing the honeycomb sandwich panel, and more specifically, a frequency selective plate used in a ship radome (AEM / S: enclosed mast). The present invention relates to a method for manufacturing a large honeycomb sandwich panel and a honeycomb sandwich panel manufactured by vacuum-assisted resin transfer molding (VaRTM).

  Conventionally, when a resin molded product such as a fiber reinforced plastic (FRP) panel is manufactured, a resin transfer molding method (RTM) or a vacuum resin transfer molding method (VaRTM) is known. With the development of fiber reinforced plastic panels on the hull, there is a limit to molding large resin moldings in the autoclave method, so the development of fiber reinforced plastic panels by the vacuum resin transfer molding method (VaRTM) is underway. (For example, refer to Patent Document 1).

  Also, in recent years, ship radomes (AEM / S: Enclosed Mast) to which a frequency selective surface (FSS) is applied to stealth the ship's upper mast (to make it difficult to be captured by radar). ) Is also under development.

However, the ship radome has a honeycomb core sandwich panel structure that uses GFRP (glass fiber reinforced plastic) as the skin material, and has a polyhedral structure that combines the panels, and cannot be molded by the autoclave curing equipment. Since it is a large size, it is difficult to manufacture, and it is a reality that a molding method in which the frequency selection plate as described above is incorporated in a ship radome has not been proposed yet.
JP 2001-96611 A

  The present invention has been devised by paying attention to such conventional problems, and in particular, a honeycomb sandwich panel capable of easily manufacturing a large fiber-reinforced plastic panel incorporating a frequency selection plate and a manufacturing method thereof. It is intended to provide.

  In order to achieve the above object, the honeycomb sandwich panel according to the present invention has a frequency selection plate that transmits or blocks a specific frequency via an adhesive on the front and back surfaces of a honeycomb core formed of a nonmetallic material. In addition, the gist is that a fiber reinforced resin sheet is integrally laminated on the surface of the frequency selection plate.

  Here, the honeycomb core is composed of one selected from an aromatic polyamide fiber, a resin material, a foam material, a syntactic foam, and wood, and the adhesive is a film-like epoxy adhesive. .

  In the honeycomb sandwich panel manufacturing method of the present invention, a rubber-like elastic sheet is laid on a metal base member, and a fiber-reinforced base material and a frequency selection plate are bonded to the front and back surfaces of the rubber-like elastic sheet. At least one or more layers of honeycomb cores and fiber reinforced substrates made of non-metallic material are sequentially laminated, then the whole is covered with a film-like vacuum back, and the reaction resin material is supplied with the laminated body in the vacuum back being vacuumed. Then, the gist is to impregnate and cure the reactive resin material on the fiber reinforced base material.

  Here, for the honeycomb core, one selected from aromatic polyamide fiber, foam material, syntactic foam, and wood is used.

  In this way, a large fiber-reinforced plastic panel incorporating a frequency selection plate can be easily manufactured by the manufacturing method.

  Since the present invention is configured as described above, a large-sized fiber reinforced plastic panel incorporating a frequency selection plate can be easily manufactured by a vacuum resin transfer molding method (VaRTM), and further a vacuum resin transfer molding method Thus, there is an effect that an aromatic polyamide honeycomb core (Nomex (registered trademark) honeycomb core) which is cheaper and lighter than resin and wood can be used as the honeycomb core material.

  Further, when manufacturing a honeycomb sandwich panel by the vacuum resin transfer molding method, the reaction resin material does not directly contact the metal base member having a large heat capacity. As a result, the reaction heat of the reaction resin material is reduced to the metal base. There is an effect that the resin molding can be effectively prevented from being poorly cured without being absorbed by the member.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view of a honeycomb sandwich panel incorporating a frequency selection plate embodying the present invention, and FIG. 2 is a perspective view of the honeycomb sandwich panel of the present invention. The honeycomb sandwich panel is formed of a nonmetallic material. A frequency selective surface 3 (FSS: frequency selective surface) that transmits or blocks a specific frequency is laminated on the front and back surfaces of the honeycomb core 1 through an adhesive 2 made of a film-like epoxy adhesive. A fiber reinforced resin sheet 4 is integrally laminated on the surface of the frequency selection plate 3.

  The honeycomb core 1 is made of one selected from a resin material, a foam material, a syntactic foam, and wood in addition to an aromatic polyamide (Nomex (registered trademark)) which is a non-metallic material. A honeycomb core formed of aromatic polyamide fiber that is cheaper and lighter than resin or wood is used. Further, as the adhesive 2, a film-like epoxy adhesive is used.

  Further, the frequency selective plate 3 (FSS: frequency selective surface) is formed of a light metal plate, and is used by forming a thickness of the light metal plate or various through holes in order to transmit or block a specific frequency. Is.

  Next, a method for manufacturing the honeycomb sandwich panel as described above by a vacuum resin transfer molding method (VaRTM) will be described with reference to FIG.

  First, a rubber-like elastic sheet 6 is laid on a metal base member 5, and a fiber-reinforced resin sheet 4 (fiber reinforced base material) and a frequency selection plate 3 are placed on the rubber-like elastic sheet 6 via an adhesive 2. The honeycomb core 1 (aromatic polyamide honeycomb core) made of a nonmetallic material adhered to the front and back surfaces is placed, and at least one or more fiber reinforced resin sheets 4 (fiber reinforced base materials) are sequentially laminated, and then the laminate. The whole is covered with a film-like vacuum back 9 in which the resin material inlet 7 and the vacuum pipe 8 are arranged at a part of the periphery, and the periphery is sealed on the base member 5 with an adhesive tape 10 or the like.

  Thereafter, the laminated body in the vacuum back 9 is vacuumed by the vacuum pump P connected to the vacuum pipe 8, and the fiber reinforcement of the laminated body is made from the resin material inlet 7 connected to the resin material supply tank 11 in a vacuum state. The resin sheet 4 is supplied with a room-temperature curable reaction resin material Q (for example, a thermoplastic material such as vinyl ester) and impregnated, and is impregnated and cured by reaction heat of the reaction resin material Q.

  In this way, since the reaction resin material Q is supplied and impregnated and cured, the reaction resin material Q does not directly contact the metal base member 5 having a large heat capacity. Heat is not absorbed by the metal base member 5 and curing failure can be effectively prevented.

  Moreover, since the rubber-like elastic sheet 6 also has a releasing effect on the resin material, it is not necessary to apply a release agent in advance, and the resin molded product W can be released or released smoothly from a metal mold or metal plate. I can do it. As a result, productivity can be improved.

  Moreover, since the rubber-like elastic sheet 6 also has a releasing effect on the resin material, it is not necessary to apply a release agent in advance, and the resin molded product W can be released or released smoothly from a metal mold or metal plate. I can do it. As a result, productivity can be improved.

It is a disassembled perspective view of the honeycomb sandwich panel incorporating the frequency selection board which implemented this invention. It is a perspective view of the honeycomb sandwich panel of this invention. It is a partial expanded sectional view of the vacuum resin transfer molding apparatus which implemented the manufacturing method of the honeycomb sandwich panel of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Honeycomb core 2 Adhesive 3 Frequency selection board 4 Fiber reinforced resin sheet 5 Base member 6 Rubber elastic sheet 7 Resin material inlet 8 Vacuum piping 9 Vacuum back 10 Adhesive tape 11 Resin material supply tank Q Room temperature curing type reaction resin material

Claims (5)

A frequency selection plate that transmits or cuts off a specific frequency via an adhesive is laminated on the front and back surfaces of a honeycomb core formed of a non-metallic material, and a fiber reinforced resin sheet is integrally formed on the surface of the frequency selection plate. A laminated honeycomb sandwich panel. The honeycomb sandwich panel according to claim 1, wherein the honeycomb core is composed of one selected from an aromatic polyamide fiber, a resin material, a foam material, a syntactic foam, and wood. The honeycomb sandwich panel according to claim 1 or 2, wherein the adhesive is a film-like epoxy adhesive. A rubber-like elastic sheet is laid on a metal base member, and on this rubber-like elastic sheet, a fiber reinforced base material, a honeycomb core made of a nonmetallic material having a frequency selection plate bonded to the front and back surfaces, and a fiber reinforced base material After sequentially laminating at least one layer or more, the whole is covered with a film-like vacuum bag, the reactive resin material is supplied in a state where the laminated body in the vacuum bag is vacuumed, and the fiber reinforced base material is impregnated with the reactive resin material A method for manufacturing a honeycomb sandwich panel to be cured. The method for manufacturing a honeycomb sandwich panel according to claim 4, wherein the honeycomb core is one selected from aromatic polyamide fiber, foam material, syntactic foam, and wood.

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