JPH0611494B2 - Composite material molding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for forming a composite material, and particularly to a pre-impregnation by passing a forming material sandwiched between two films between primary rollers. After that, the present invention relates to a molding processing method in which the molding material is lifted using a surface plate while applying tension to the film, and the secondary roller is rolled in a direction orthogonal to the impregnation finish.

[Conventional technology and problems]

A reinforced plastic is known as a plastic whose mechanical strength is improved by impregnating a reinforcing material with a low-pressure molding resin for molding. Conventionally, a hand lay-up method, a resin injection method, a matched die method, etc. have been used to mold a large-sized panel made of this strong plastic. The hand lay-up method is a method in which a glass fiber base material is laid over a mold, a polyester resin with a curing catalyst is applied from above to impregnate the glass fiber base material, and after curing, the mold is removed. The product has the advantage that it can be manufactured at room temperature and without pressure and can be manufactured using a simple mold, but on the other hand, the molding cycle is long and handling of the resin is inconvenient. In addition, a resin injection method or a method in which reinforcing fibers are set in advance in the cavity of a molding die and a liquid resin is injected into the cavity. This method requires a molding die and a liquid resin injection device, and thus it is difficult to obtain a large-sized molded product.

Furthermore, the matched die molding is a method in which a liquid polyester resin is poured onto glass short fibers placed on the F mold by using a pair of upper and lower molds, and then the mold is closed and heated and pressed. This method is excellent for mass production of molded products, but has a problem of requiring a press facility for generating a high molding pressure.

Therefore, an object of the present invention is to solve the problems of the conventional molding method, and to provide a molding method of a composite material capable of molding a large-sized reinforced plastic panel having a relatively simple shape at a low equipment cost. It is in.

[Means for solving problems]

In order to achieve the above-mentioned object, a method of forming a composite material according to the present invention includes a step of sandwiching between two films of a forming material, and a primary roller having a plurality of circumferential grooves on its outer circumference. Through pre-impregnation and degassing while leaving a strip-shaped raised strip on the surface of the forming material, a step of pushing up the surface plate from the lower surface of the film while applying tension to the film, and a state of being pushed up by this surface plate Then, a step of rolling and impregnating and defoaming the molding material by rolling a secondary roller whose outer peripheral surface is flat in a direction orthogonal to the sheet passing direction with respect to the primary roller is provided.

Example of Invention

Hereinafter, a method of forming a composite material according to the present invention will be described with reference to the drawings.

Prior to describing the method of molding a composite material according to the present invention, a molding apparatus used for carrying out this method will be described with reference to FIGS. 1 to 6.

FIG. 1 is a schematic view showing the appearance of a molding machine. A frame 1 of a molding machine in which a frame member is arranged at a position corresponding to a ridge of a rectangular parallelepiped has a front frame 2 and a rear frame 3. And side frames 4 and 5. Of these, in front of the front frame 2,
A pedestal 7 of the forming material 6 is arranged, and the pedestal 7 is composed of a table 8 and an underframe 9. The upper surface of the table 8 is formed with two films, as described later, of the forming material 6 to be formed. It is placed in a state of being sandwiched between them. Also, front frame 2
Is a primary roller consisting of an upper roller 10 and a lower roller 11.
12 are erected so that they can rotate freely. Of these, the upper roller 10 is formed with a plurality of circumferential grooves 13, 13 ... 13 at a predetermined pitch in the axial direction.

On the other hand, in the molding machine frame 1, there is installed a heating platen 14 whose upper surface is aligned with a horizontal plane, and this heating platen 14 can be lifted or lowered by pneumatic operation as apparent from FIGS. 2 and 3. Guide rods 16 and 16 are used to enable the heating platen 14 to move in parallel and to move up and down by a cylinder device 15.

Further, the primary rollers 12 are provided on the top surfaces of the front frame 2 and the rear frame 3.
Racks 17 and 18 are respectively fixed so as to be parallel to. Pinion gears 19 and 20 are meshed with these rack teeth, and the pinion gears 19 and 20 can roll on the rack tooth upper circle by a handle operation (not shown). These pinion gears 19 and 20 are connected by a shaft 21, and brackets 22 and 23 are suspended below the shaft 21,
A secondary roller 24 at the front of the brackets 22 and 23 is rotatably supported. This secondary roller 24 is arranged such that its axis is orthogonal to the axis of the primary roller 12,
The secondary roller 24 is configured to be movable up and down by a pneumatically operated lifting cylinder device (not shown).

Further, in the frame 1 of the molding machine, a traction for pulling the molding material 6 sandwiched between the upper and lower films and passing between the primary rollers 12 to be pre-impregnated and defoamed to a predetermined position in the frame. A device 25 is provided. As shown in FIG. 4, the towing device 25 has a pair of endless drive chains 26 and 27 which are horizontally installed so as to face the insides of the side frames 4 and 5 of the molding machine frame 1 so as to face each other. . This drive chain
Film gripping jigs 28 are horizontally installed at corresponding positions of 26 and 27. This film gripping jig 28 is the fifth
As shown in the figure, the upper and lower films 29a and 29b have a groove 28a into which the superposed tips can be inserted, and the ends of the film can be fixed and held by a clamp plate 30 and a bolt 31. According to the towing device 25 configured in this way,
The tips of the upper and lower films 29a, 29b holding the forming material 6 are held by the film gripping jig 28. For example, by driving the drive chains 26, 27 in the downward direction of the arrow by a manual handle operation, the film is directly above the heating platen 14. Can be towed into place.

Furthermore, a film fixing frame 32, which is substantially parallel to the upper surface of the heating platen 14, is fixed in the molding machine frame 1. The film fixing frame 32 is formed in a U shape in a plan view, and is constituted by a channel member having an opening groove facing outward. Upper film 29 encapsulating the molding material 6 pre-impregnated by passing between the primary rollers 12.
The a and the lower film 29b are pulled into predetermined positions in the molding machine frame 1 by the towing device 25 and then fixed to the film fixing frame 32. Therefore, the sixth
A clamp jig 33 as shown is used. That is, in the illustrated example, a stack of upper and lower films 29a and 29b is wound around the lower flange 32a of the film fixing frame 32, and L
An example is shown in which the character-shaped clamp member 34 is sandwiched between the clamp jigs 33.

Next, a method of molding a large FRP panel using the above-described molding apparatus will be described.

Thermosetting liquid resin such as unsaturated polyester resin is used as the matrix of the molding material, and glass fiber cloth, carbon fiber, aramid fiber or the like is used as the reinforcing fiber. A polyvinyl alcohol film or the like is used as the film.

First, the lower film 29b of polyvinyl alcohol is placed on the table 8 of the pedestal 7, and a glass fiber cloth cut into a predetermined size is placed thereon. Put a certain amount of unsaturated polyester resin on the glass fiber and lightly spread it all over. When the upper film 29a is set on it, the preparation of the molding material is completed. Next, the upper and lower films 29a and 29b containing the forming material 6 are passed through the primary rollers 12 and then sandwiched by the film gripping jig 28, and the towing device 25 is driven to form the primary rollers 12. Engage the molding material 6 between the lower roller 11 and the lower roller 11. While passing through these rollers, a strip-shaped ridge is formed on the surface of the molding material 6 and at the same time, pre-impregnation and defoaming are performed. At this time, it is preferable to fold back both sides of the upper and lower films 29a and 29b in order to prevent the resin from flowing out. Next, the periphery of the film is fixed to the film fixing frame 32 using the clamp jig 33.

Then, the elevating cylinder device 15 is driven to push up the surface plate 14 as shown in FIG. 3 to apply tension to the films 29a and 29b. While holding the surface plate 14 shown in FIG. 3,
The secondary roller 24 is pressed against the ridged surface of the molding material 6 using an air cylinder, and the pinion gears 19 and 20 are manually rotated to impart a traverse motion in the direction of arrow B to the secondary roller 24 for impregnation. The forming material 6 is stretched in the lateral direction while defoaming. At this time, excess resin left in a strip shape when passing the primary roller 12 is pressed by the secondary roller,
It is possible to effectively compensate for the shortage of resin when the width is set. When the product molded in this way hardens, it is demolded and the work is completed.

〔The invention's effect〕

As is clear from the above description, according to the present invention, the forming material sandwiched between the two films is pre-impregnated and defoamed by the primary roller, and then the platen is pushed up to apply tension to the film. Since the secondary roller is used for finish impregnation and defoaming, a large panel of reinforced plastic can be manufactured at low cost without the need for upper and lower molding dies and press equipment as in the conventional case. In addition, a band-shaped raised strip is left on the surface of the forming material by passing it between primary rollers provided with a plurality of circumferential grooves on the outer periphery, and then the outer peripheral surface is flat while being pushed up by the surface plate. When a certain secondary roller rolls, excess resin left on the strip-shaped ridges is pressed by the secondary roller, and it is possible to effectively compensate for the resin shortage during the tentering.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a molding apparatus used in a molding method according to the present invention, and FIG. 2 is a side view showing a state after pre-impregnation by a primary roller and before pushing up a heating platen. , Fig. 3 is a side view showing a state after pushing up the heating platen,
FIG. 4 is a perspective view schematically showing a film towing device, FIG. 5 is a perspective view showing a clamped state of a film holding jig, and FIG. 6 is a diagram showing a held state of the film by the clamp jig. Is. 1 ... frame, 6 ... molding material, 12 ... primary roller,
13 …… circumferential groove, 14 …… heating surface plate, 24 …… secondary roller, 25
...... Towing device, 26, 27 ...... Drive chain, 28 ...... Film gripping jig.

Claims (1)

[Claims] 1. A strip-shaped ridge is formed on the surface of a molding material by sandwiching it between two films of the molding material and passing it between primary rollers having a plurality of circumferential grooves on the outer circumference. A step of pre-impregnating and defoaming while leaving, a step of pushing up the surface plate from the lower surface of the film while applying tension to the film,
In a state of being pushed up by the surface plate, a step of rolling a secondary roller whose outer peripheral surface is flat to finish impregnating and defoaming the forming material in a direction orthogonal to the sheet passing direction with respect to the primary roller is provided. A method of forming and processing a composite material.