JPS59228872A - Frp molding method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention This invention relates to Mh fiber reinforced plastics (hereinafter referred to as FRP).
Regarding the manufacturing method of molded products with an outer shell of
In order to mold the outer shell, fluid is introduced into the hollow core component (airbag phase) that constitutes the molding material to generate internal pressure, and raw reinforcement for FRP molding is attached around it. Mh
When heat-pressing a material impregnated with an uncured liquid synthetic resin for the matrix and semi-cured if necessary,
By reducing the volume of the molding material in advance before inserting it into the mold, it is easier to insert the four molding materials into the mold, increasing the charging effect on the inner corners of the mold, and reducing the occurrence of paris. This is intended to prevent this and improve moldability.

As in the invention described in Japanese Patent Application No. 57-132746 filed by the present applicant on July 29, 1980, as a means of manufacturing a molded product having an FRP outer shell structure, it is possible to mold the product in advance with thermoplastic resin. A hollow core component separately molded to the shape of the core of the product is used, and if necessary, a fluid is sealed in the hollow part of the core component to maintain the initial shape.
The raw material for FRP molding is attached to mold the molding material of the molded product, this is inserted into the mold, the curved core component material is heated and softened, and high pressure fluid is applied to the hollow part of the core component material. A method has been proposed in which the raw material for FRP molding is fed into a mold and expanded to generate internal pressure that presses the raw material for FRP molding toward the inner circumferential wall surface of the mold.

However, as is well known, with this type of method, the shape of the molded product is more complex than circular, and even though the matrix resin of the raw material for FRP molding is an uncured liquid synthetic resin, Because it is reinforced with fibers, it is difficult to expand in the mold even if high-pressure fluid is introduced into the hollow part of the core component, especially if the medium-strength fibers of the FRP molding coexisting material are long fibers. As a result, the FRP reaches the corners of the mold, especially the parts corresponding to the upper and lower corner edges of the molded product.
111 Therefore, in order to compensate for this problem, the core component material is made to be similar to or equal to Class 1 depending on the shape of the molded product, and the shape of the molded product is
In order to prevent the raw material for P molding from deforming when attached, the wall thickness
, 1 to 3.0 m+) to maintain the initial shape of the molding material, but on the other hand, this makes it difficult to stuff the molding material into the mold and prevents the molding from occurring when the mold is clamped. If the raw material for FRP molding ejects from the mold without fully entering the mold, a part of the raw material for FRP molding that is ejected is likely to be caught by the mold mating surface and cause a cracking condition on the surface of the molded product after molding, which may cause problems during finishing. If this is cut, some of the reinforcing fibers will be cut off, causing drawbacks such as deterioration of the properties and quality of the molded product.

The purpose of this invention is to solve the above-mentioned problems of the prior invention, and the main point is that FRPIff is used around a hollow core component made of thermoplastic resin.
A molding material with green lumber for I-shaped is inserted into the mold, and fluid is introduced into the hollow part from the open end side of the core component to expand it. When hot-pressing green material, the material for forming the material is heated and softened by injecting high-temperature fluid into the core material to reduce the size of the material, and then inserted into a mold and clamped. This is a characteristic feature.

Hereinafter, this invention will be explained based on illustrated embodiments.
As shown in FIG. 1, numeral 1 in the figure is an FRP molded product obtained by a manufacturing process described later, such as a head body of a ball hitting club.

The head body 1 is made of an outer shell 2 made of FRP, a thermoplastic composite RB formed on the inside, a hollow core material 3 made of resin, and a polyurethane resin filled in the hollow part of the core material 3. The foam 4 is made of
The reinforcing fibers of the outer shell 2 are composed of a plurality of laminated layers, impregnated with a liquid synthetic tH resin for matrix, and integrally cured and molded.

Further, numeral 5 in the figure is a shaft insertion hole penetrating through the neck portion 1a of the head main body 1, the inner circumferential surface of which is made of FRP forming the outer shell 2, and the insertion hole 5
A club shaft 6 is inserted into and fixed with adhesive or the like.

Furthermore, 7 in the figure is an F on the ball hitting surface 1b side of the head body 1.
A face reinforcement plate made of hardened FRP (mainly made of carbon N & fiber as reinforcing fibers) interposed in the RP outer shell 2; 8 is a thermoplastic resin also interposed in the FRP outer shell 2 on the sole surface 1c side; A reinforcing plate made of metal or hardened FRP, etc., 9 is a weight member interposed as necessary on the FRP outer shell 2 on the back surface 1d side, 10 is a sole plate, and these members form the FRP outer shell to be described later. F to do
By holding it in the RP molding molding material or attaching it to it, it can be integrally attached at the same time as the head molding.

That is, in order to manufacture an FRP molded product such as the above-mentioned club head according to the present invention, as shown in FIGS. The core component 11 is made of celluloid sheet or vinyl chloride IN (fat sheet, etc.).
It is separately molded using a thermoplastic semi-synthetic or synthetic resin with a thickness of 0.1 to 3.0 mm by a blow molding method, etc., and the end portion corresponding to the head neck portion of the core component material 11 is opened. A head shell is formed around the FRP after a fluid such as air is sent into the hollow part from the end part 11a and is sealed once to maintain the internal pressure or to maintain its shape by the rigidity of the core constituent material itself. At the same time, a face plate is attached to a portion of the FRPJ'& shape material 12 corresponding to the head ball hitting surface, a portion corresponding to the head sole surface, and a portion corresponding to the head back surface. A resin plate 14 made of a thermoplastic resin such as ABS fA1 resin, which serves as a reinforcing plate, and a metal body 15, which serves as a weight member if necessary, are sandwiched between the hardened FRP 13, and the outer surface of the portion corresponding to the head sole surface. Metal plate 16 that becomes the sole plate
The head molding material 17 is molded by adding (
(See Figure 2).

At this time, as the raw material 12 for FRP molding used, epoxy resin is suitably used as the liquid synthetic resin for the matrix, and unsaturated polyester resin may also be used, and it forms the inner layer of the outer shell. The arrangement structure of the reinforcing fibers is mainly carbon fiber (including graphite fiber), and if necessary, glass fiber or Kevlar, etc. are appropriately combined.
The structure is made of a different type from the neck part of the head body so that the two-ply bag weave cloth has a fiber content of 96 bundles x 6000#M fibers/bundle and a thickness of 3 to 1011++ll, preferably 4 to 7 mm. As needed, a different type of bag-woven cloth is wrapped around the entire circumference of the core component 11 and on the neck portion 11a of the core component 11.
The fibers are wrapped relatively thickly with a fiber content of 2 bundles x 3000 fibers/bundle, and the edges of the hollow weave cloth in the image area are closely attached so that they partially overlap each other, while the outer side forming the head surface side is wrapped in a relatively thick layer. As the reinforcing fiber for the second layer, two to three layers of satin IJ +) cloth are used to create a layer with a thickness of 0.4 to 1. 0 mm to improve surface smoothness and shape followability, and reinforcing fibers made of 5 to 14 layers of twisted cloth or roving cloth are placed in the part corresponding to the face of the head body. It is attached so that it is relatively thick, with a thickness of 3 to 8 mm.

When inserting such a head molding material 17 into a mold 18 having a head outer peripheral shape, a fluid F1 such as air at a high temperature of about 60 to 150° C. is introduced into the core component 11. After the core component material 11 is heated and softened to facilitate deformation, the high-temperature fluid is discharged and an external force is applied to the head forming abrasive material 17 to compress it, as shown by the broken line. Reduce the overall volume (see Figure 3)
. At this time, since the heating by the high-temperature fluid is for a short time, the resulting heat transfer increases the temperature to the extent that the core component material becomes plasticized, but the heat transfer from the core component material to the raw material for FRP molding increases. Since there is insufficient heat, the temperature is not raised to a level sufficient to cure the uncured resin for the matrix.

Next, in this state, the head molding material 17 is put into the mold 18.
The core component material 11 is reheated and softened by filling the inside of the mold and clamping the mold and raising the temperature of the mold itself, or by further feeding a high temperature fluid (60 to 150 degrees Celsius) and softening the core component material 11. The fluid feeding nozzle 19 is made to face the opening end 11a of the portion corresponding to the head neck portion of the core component 1.
A high-pressure (5 to 15 kg/cm2) fluid F2 such as compressed air, steam, or pressurizing oil is introduced into the hollow part of 1 to restore the core component 11 to its initial shape and further expand and expand it. By this, the surrounding FRPJ & raw material 1 for shaping
2 is pressed one inch toward the inner peripheral wall surface 18a of the mold 18, and then hot-press molded (see FIG. 4).

After the molding is completed, a foaming compound such as foamable polyurethane resin is added to the hollow part of the core component 11 to obtain a predetermined foam density in consideration of adjusting the weight of the head body or improving the hitting sound. A love head as shown in FIG. 1 is obtained by injecting a resin liquid (not shown) and filling with foam, then inserting a club shaft and fixing with adhesive. To soften and expand by heating, if the expansion means uses a normal temperature fluid such as compressed air, it is heated by heat transfer from the mold, or if a high temperature fluid such as steam is used, it is heated separately. It is not necessary and can have both effects.

As explained above, the present invention is directed to the FR constituting the outer shell.
When hot-pressing a molding abrasive material in which raw material for P molding is attached around a core component material, the core component material is preliminarily molded with thermoplastic synthetic 4Q resin into the desired core shape of the molded product. The volume of the molding material was reduced by blow-molding it into a shape approximately similar to that of the car) FRPrIi, and before inserting it into the mold after the raw material for the shape was first heated and softened by supplying high-temperature fluid. This is inserted into the mold, clamped, and then expanded and restored by supplying high-pressure fluid, which makes it easier to pack the molding material into the mold by reducing the volume, which is much easier than conventional methods. Since the raw material for FRP molding is not caught between the mold mating surfaces during mold clamping, it is possible to reliably prevent the occurrence of cracks, resulting in excellent moldability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of an FRP molded product according to the present invention, and FIGS. 2 to 4 are explanatory diagrams showing manufacturing states according to the same invention. 11... Core constituent material, 12... Raw material for FRP molding, 17... Molding material, 18... Molding mold, F
l...High temperature fluid F2...High pressure fluid.

Claims (1)

[Scope of Claims] (1) A molding material with green material for molding (FRI) attached around a hollow core component made of thermoplastic resin is inserted into a mold, and the core component phase is Fluid is introduced into the hollow part from the open end side to expand the FRPIti. FRP molding and casting method 2, characterized in that when hot-pressing the raw material for shaping, the inside of the core constituent material is heated and softened to reduce the size of the molding material, and then inserted into a mold and clamped. , The FRP molding method according to claim 1, characterized in that a high temperature fluid is introduced into the core component. (3) In the FRP molding and casting method according to any one of claims 1 or 2, b., inserting a plate material made of metal, FRP or thermoplastic resin into the raw material for FRP molding. Or a molding method characterized by adding (=j).