JP2006175606A - Insert for frp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert for FRP which is constituted so as to easily arrange a plurality of insert members to a predetermined region of an FRP laminated product with high precision to embed them in the FRP laminated product, prevents the FRP laminated product from being carelessly collapsed under a pressure environment at the time of molding of the FRP laminated product and does not obstruct the original thermosetting at the time of molding of the FRP laminated product. <P>SOLUTION: Since the insert 1 for FRP, which is arranged between the CFRP layers of the predetermined region of a CFRP laminated product at the time of molding to be embedded in the CFRP laminated product, is constituted so that the insert members 2B and 2C are mutually positioned and held at predetermined positions in the direction along an installation surface 1A by a core material 3, the insert members 2B and 2C are easily arranged at the predetermined position of the CFRP laminated product with high precision to be embedded in the CFRP laminated product. Since the insert 1 for FRP is coated with a CFRP coating layer 4 high in pressure-resistant strength, it is not caralessly collapsed under the pressure environment at the time of molding of the CFRP laminated product and, since the CFRP coating layer 4 cuts off the discharge of internal moisture, the original thermosetting of the CFRP laminated product at the time of molding is not obstructed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an FRP insert embedded between FRP layers constituting an FRP laminate.

  FRP (Fiber Reinforced Plastics) laminates, which are fiber reinforced plastics, especially CFRP (Carbon Fiber Reinforced Plastics) laminates, which are carbon fiber reinforced plastics, are lightweight and have high strength. It is also used as a vehicle body structural part. And in this kind of FRP laminated product, the insert member which comprises the fastening site | part with another member etc. is normally embed | buried (for example, refer patent document 1).

Here, Patent Document 1 shows a structure in which one insert member is embedded in an FRP laminated product having a sandwich structure in which a urethane foam core is sandwiched between FRP layers. As such FRP laminates having a sandwich structure, those using a synthetic resin foam as a core material (for example, see Patent Document 2) and those using a balsa material as a core material (for example, see Patent Document 3) are known. It has been.
JP-A-5-253946 (paragraph number 18, FIG. 1) JP 2001-246686 A (abstract) JP-A-10-162797 (abstract)

  By the way, in the embedding structure of the insert member as described in Patent Document 1, when inserting a plurality of insert members at predetermined positions in a predetermined portion of the FRP laminated product, each insert member is mutually connected. It must be accurately positioned and buried. For this reason, the embedding work of each insert member is very troublesome, and there is a problem that the workability is lowered. In addition, there is a problem that the accuracy of the mutual position of each insert member tends to decrease.

  Therefore, the present invention can embed a plurality of insert members in a predetermined part of an FRP laminate product easily and with high accuracy, and inadvertently even in a pressurized environment when molding the FRP laminate product. It is an object of the present invention to provide an insert for FRP that is not crushed and that does not hinder original thermosetting at the time of molding an FRP laminate.

  The FRP insert according to the present invention is an FRP insert embedded between the layers of the FRP layer constituting a predetermined part of the FRP laminated product, and is positioned at a predetermined position in the installation surface direction to hold a plurality of insert members. And a FRP coating layer covering the core material.

  The FRP insert according to the present invention is installed and embedded between the layers of the FRP layer constituting the predetermined portion in order to form a fastening portion with another member at the predetermined portion when the FRP laminated product is formed. . Here, in the insert for FRP of the present invention, since the plurality of insert members are positioned and held at predetermined positions in the installation surface direction by the core material, the plurality of insert members can be easily and highly positioned at predetermined portions of the FRP laminated product. Arranged with accuracy.

  In addition, since the FRP insert of the present invention is covered with an FRP coating layer having a high pressure resistance, even when a material having a low pressure resistance is used for the core material, it is under a pressurized environment at the time of molding the FRP laminated product. It won't be inadvertently crushed. And since this FRP insert blocks the release of moisture inside the FRP coating layer, even when a highly hygroscopic material is used for the core material, the original thermosetting at the time of molding the FRP laminated product is hindered. There is nothing.

  In the FRP insert of the present invention, in order to simplify the manufacturing process and increase the pressure resistance, the FRP coating layer is preferably a CFRP coating layer formed from a CFRP prepreg. In order to achieve weight reduction, the insert member is preferably made of a CFRP laminate, and the core material is more preferably made of a balsa material or a foamed plastic.

  When the core material is composed of a plate-shaped balsa material, in order to increase its pressure resistance, the wood fiber direction of the balsa material is perpendicular to the installation surface of the FRP insert, and the side surface of the balsa material is relative to the installation surface. It is preferable to form it on a forward inclined surface.

  According to the insert for FRP according to the present invention, since the plurality of insert members are positioned and held at predetermined positions in the installation surface direction by the core material, the plurality of insert members can be easily and highly positioned at predetermined portions of the FRP laminated product. It can be placed with accuracy. As a result, the FRP laminate and other members can be easily fastened with a plurality of insert members as fastening members.

  In addition, since the FRP insert of the present invention is covered with an FRP coating layer having a high pressure resistance, even when a material having a low pressure resistance is used for the core material, it is under a pressurized environment at the time of molding the FRP laminated product. It won't be inadvertently crushed. And since this FRP insert blocks the release of moisture inside the FRP coating layer, even when a highly hygroscopic material is used for the core material, the original thermosetting at the time of molding the FRP laminated product is hindered. There is nothing.

  Embodiments of an FRP insert according to the present invention will be described below with reference to the drawings. In the drawings to be referred to, FIG. 1 is a cross-sectional view of a predetermined portion of an FRP laminated product in which an FRP insert according to an embodiment is embedded, FIG. 2 is a plan view of the FRP insert shown in FIG. 1, and FIG. It is sectional drawing which follows the III-III line.

  As shown in FIG. 1, the FRP insert 1 according to an embodiment forms a fastening portion with another member at a predetermined portion of the FRP laminated product A, so that a plurality of portions constituting the predetermined portion of the FRP laminated product A are included. It is installed and buried between arbitrary layers of the FRP layer B of the layer.

  In addition, although the kind and manufacturing method of the reinforced fiber and thermosetting resin for shape | molding FRP laminated product A are not specifically limited, In one Embodiment, carbon / impregnated carbon fiber impregnated with epoxy resin A CFRP laminate A in which a plurality of CFRP layers B are laminated is formed by laminating a plurality of epoxy prepregs and performing autoclave molding.

  The insert 1 for FRP is formed into a thick plate having a trapezoidal side surface, and the planar shape thereof is, for example, an approximately square shape with rounded corners as shown in FIG. A plurality of insert members are embedded in the FRP insert 1. For example, an insert member 2A is embedded in the center portion of the FRP insert 1, and a pair of insert members 2B and 2B and another pair of inserts are arranged on both sides of the insert member 2A near the corner of the FRP insert 1. The members 2C and 2C are embedded.

  The material of these insert members 2A, 2B, 2C may be a steel material that is generally used as a fastening member, but in one embodiment, in order to reduce the weight, a laminate of CFRP is used. In the example shown in FIG. 2, the insert member 2A is formed in a square block shape in plan view, the insert members 2B and 2B are formed in a square block shape in plan view slightly smaller than the insert member 2A, and the insert members 2C and 2C. Is formed in a cylindrical shape having a bolt insertion hole.

  As shown in FIG. 3, the FRP insert 1 positions the insert members 2A, 2B, 2C (see FIG. 2) in the direction of the installation surface 1A (the plane direction in FIG. 2) with respect to the CFRP laminate A (see FIG. 1). The core material 3 that is fitted and held in this state and the FRP coating layer 4 that covers the entire surface of the core material 3 including the insert members 2A, 2B, and 2C are configured.

  The core material 3 is made of a plate-like balsa material for weight reduction, and the wood fiber direction of the balsa material is along the plate thickness direction orthogonal to the installation surface 1A of the FRP insert 1. And the core material 3 which consists of this balsa material is formed in the trapezoidal cross-sectional shape by forming the peripheral surface in the inclined surface 3A of the forward inclination of 45 degrees with respect to the installation surface 1A of the insert 1 for FRP, for example. Has been.

  The FRP coating layer 4 is a CFRP coating obtained, for example, by autoclaving a carbon / epoxy prepreg in which a carbon fiber is impregnated with an epoxy resin in order to increase the pressure resistance of the FRP insert 1 and simplify the manufacturing process. Layer 4 is assumed.

  FIG. 4 shows a molding process of the FRP insert 1 having the above structure. First, the core material 3 made of a plate-shaped balsa material is formed with an inclined surface 3A on the entire circumference of the side surface, and the insert members 2A, 2B, 2C (see FIG. 2) are fitted and held. Holes 3B, 3C and the like are formed penetrating in the plate thickness direction.

  Subsequently, the insert members 2B, 2C, etc. are fitted into the holding holes 3B, 3C, etc. of the core material 3, respectively. In this case, the insert members 2B, 2C, etc. are fitted into the holding holes 3B, 3C, etc., appropriately through fillers or adhesives in order to prevent loosening.

  After the core material 3 fitted with the insert members 2B, 2C and the like is appropriately dried, the carbon / epoxy prepreg PP is attached along the lower surface and the upper surface including the inclined surface 3A. In this case, it is desirable to apply an adhesive in advance to the surface of the core material 3 with which the carbon / epoxy prepreg PP contacts.

  The core material 3 in which the carbon / epoxy prepreg PP is attached to the upper surface and the lower surface is placed on a table T in an autoclave (not shown) and is airtightly covered by the back film F. In this state, after the air in the back film F is sucked from the exhaust hole T1 of the table T by a vacuum pump or the like (not shown), the carbon / epoxy prepreg PP is heated through the back film F under a predetermined pressure condition. Cured.

  The pressurizing condition in the autoclave is set to such an extent that the core material 3 made of balsa material is not crushed in the lateral direction perpendicular to the wood fiber direction, that is, about 1 to 3 (atm). The heating temperature is set to about 130 ° C. Then, the CFRP coating layer 4 in which the carbon / epoxy prepreg PP is cured is formed on the entire surface of the core material 3 by a heat curing process for about 4 hours under such conditions.

  Therefore, by trimming the CFRP coating layer 4 protruding around the core material 3, the FRP insert 1 in which the inclined surface 1B of the CFRP coating layer 4 is formed on the entire circumference of the side surface is formed.

  In one embodiment of the FRP insert 1 formed by such a process, the core material 3 is made of a lightweight balsa material, and the insert members 2A, 2B, 2C are also made of a CFRP laminate that is extremely lighter than a steel material. Therefore, it is extremely lightweight. Moreover, since the core material 3 is covered with the CFRP coating layer 4, this FRP insert 1 has extremely high pressure resistance.

  The FRP insert 1 according to one embodiment forms a predetermined portion of the CFRP laminate A in order to form a fastening portion with another member at the predetermined portion when the CFRP laminate A shown in FIG. 1 is formed. It is installed and buried between arbitrary layers of a plurality of CFRP layers B.

  Here, in the insert 1 for FRP of one embodiment, the plurality of insert members 2A, 2B, and 2C are positioned and held at predetermined positions in the direction of the installation surface 1A by the core material 3, so that the plurality of insert members 2A, 2B, and 2C are easily and accurately arranged and embedded in a predetermined portion of the CFRP laminate A.

  In the FRP insert 1, the core material 3 is made of a balsa material having a low pressure resistance, but the core material 3 is covered with a CFRP coating layer 4 having a very high pressure strength, and the CFRP coating layer Since the entire circumference of the side surface of 4 is an inclined surface 1B of about 45 °, the CFRP laminated product A is also cured under a heating condition of about 180 to 200 ° C. in a pressurized environment of about 6 (atm). , It won't collapse carelessly.

  The FRP insert 1 is formed of the CFRP laminated product A even though the core material 3 is made of a highly hygroscopic balsa material because the CFRP coating layer 4 blocks the release of moisture inside. It does not interfere with the original thermosetting at the time.

  Therefore, according to the FRP insert 1 of one embodiment, a plurality of insert members 2A, 2B, 2C can be easily and accurately placed and embedded in a predetermined part of the CFRP laminate A. As a result, CFRP laminate A and other members can be easily formed by inserting bolts into each insert member 2C, or by forming nuts into which the bolts are screwed by tapping insert members 2A and 2B. It becomes possible to conclude.

  The insert for FRP of the present invention is not limited to one embodiment. For example, the FRP insert may be the FRP insert 11 having a circular planar shape as shown in FIG. 5, or may have an elliptical planar shape (not shown).

  Further, the arrangement, shape, or number of the insert members 2A, 2B, and 2C shown in FIG. 2 are not limited to the example shown in FIG. 2, and can be changed as appropriate. For example, as shown in FIG. 5, each insert member may be a cylindrical insert member 12 having a bolt insertion hole similar to the insert member 2C shown in FIG. 2, or the insert member shown in FIG. It is good also as a block shape (illustration omitted) similar to 2A and 2B.

  Furthermore, the material of the core material 3 is not limited to the balsa material, and may be a foamed plastic such as urethane foam.

  The carbon / epoxy prepreg PP constituting the CFRP coating layer 4 of the FRP insert 1 is made of glass fiber, aramid fiber, various metal fibers, etc., as reinforced fiber, and epoxy resin, polyester resin, silicone resin, polyimide resin, etc. It can change into the other prepreg made into matrix resin.

It is sectional drawing of the predetermined | prescribed site | part of FRP laminated product A with which the insert for FRP which concerns on one Embodiment of this invention was embed | buried. It is a top view of the insert for FRP shown in FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which shows the formation process of the insert for FRP shown in FIG. It is a top view which shows the modification of the insert for FRP of one Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insert for FRP 1A Installation surface 2A Insert member 2B Insert member 2C Insert member 3 Core material 3A Inclined surface 4 FRP coating layer (CFRP coating layer)
11 Insert for FRP 12 Insert member A FRP laminated product (CFRP laminated product)
B FRP layer (CFRP layer)
PP carbon / epoxy prepreg

Claims (4)

  An FRP insert embedded between FRP layer layers constituting a predetermined part of an FRP laminated product, a core material that is positioned at a predetermined position in the installation surface direction and holds a plurality of insert members, and the core material An FRP insert comprising an FRP coating layer for covering.   The FRP insert according to claim 1, wherein the FRP coating layer is a CFRP coating layer formed by a CFRP prepreg.   The insert for FRP according to claim 1, wherein the insert member is formed of a CFRP laminate.   The core material is composed of a plate-shaped balsa material, and the wood fiber direction of the balsa material is orthogonal to the installation surface, and the side surface of the balsa material is formed in an inclined surface with a forward slope with respect to the installation surface. The insert for FRP according to any one of claims 1 to 3, wherein the insert is for FRP.

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