JPS62267106A - Method for fabricating composite material - Google Patents

Abstract

PURPOSE:To enable a large-sized reinforced plastic panel to be manufactured at low cost by a method wherein a forming stock, which is pinched between two films, is impregnated and deaerated preliminarily by a pair of primary rollers and, after that, impregnated and deaerated finally by a secondary roller in the state that the tension is given to the films by pushing up a surface plate. CONSTITUTION:Band-like protuberant stripes are formed on the surface of a forming stock 6 which is contained between an upper and a lower films 29a and 29b, passed between a pair of primary rollers 12, and at the same time the forming stock is impregnated and deaerated preliminarily and fixed to a fixing frame 32. After that, a surface 14 is pushed up in order to give the tension to the films 29a and 29b and, after that, a secondary roller 24 is pushed by means of an air cylinder against the surface, on which protuberant stripes are formed, of the forming stock 6 so as to give the secondary roller 24 traverse motion in the direction indicated with the arrow B by rolling rack gears 19 and 20 to impregnate and deaerate and at same time laterally stretch the forming stock 6. Thus, a large-sized reinforced plastic panel can be formed at low equipment cost.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for molding and processing composite materials, and in particular, passing a molding material sandwiched between two films between primary rollers to pre-impregnate it. The present invention relates to a forming method in which the forming material is then lifted using a surface plate while applying tension to the film, and a secondary roller is rolled in a perpendicular direction to perform an impregnation finish.

[Conventional technology and problems]

Reinforced plastics are known as plastics whose mechanical strength is improved by impregnating a reinforcing material with a low-pressure molding resin and molding the resulting material.

In order to mold large panels made of reinforced plastic, methods such as the hand lay-up method, the resin injection method, and the mantid die method have been used. The hand lay-up method is a method in which a glass fiber base material is laid on a mold, a polyester resin containing a curing catalyst is applied over it to impregnate the glass fiber base material, and the mold is removed after curing. Although it has the advantage that the product can be manufactured at room temperature and without pressure using a simple mold, it has a long molding cycle and is inconvenient to handle the resin. Furthermore, the resin injection method is a method in which reinforcing fibers are set in advance in a cavity of a mold, and a liquid resin is injected into the cavity.

This method requires a mold and also requires an injection device for liquid resin, making it difficult to obtain large molded products.

Furthermore, matted die molding is a method in which a pair of upper and lower molds is used to pour liquid polyester resin onto short glass fibers placed on mold F, and then the molds are closed and heated and pressurized. Although this method is excellent for mass production of molded products, it has the problem of requiring press equipment to generate high molding pressure.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a composite material molding method that solves the problems of conventional molding methods and can mold large reinforced plastic panels with relatively simple shapes at low equipment costs. It is in.

[Means for solving problems]

In order to achieve the above object, the method for molding a composite material according to the present invention includes a step of sandwiching a molding material between two films, and a step of sandwiching a molding material between two films, and a step of sandwiching a molding material between two films, and a step of sandwiching the molding material between two films, and a step of sandwiching the molding material between two films, and a step of sandwiching the molding material between two films, and a step of sandwiching the molding material between two films, and a step of sandwiching the molding material between two films, and a step of sandwiching the molding material between two films. a step of pre-impregnating and defoaming while leaving band-like raised stripes on the surface of the molded material; a step of pushing up a surface plate from the bottom surface of the film while applying tension to the film;
This method is characterized by comprising a step of rolling a secondary roller in a direction perpendicular to the direction in which the sheet passes through the primary roller to finish impregnating and removing the forming material.

[Embodiments of the invention]

The method for molding a composite material according to the present invention will be described below with reference to the drawings.

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

Figure 1 schematically shows the external appearance of a molding machine. Frame 1 of the molding machine is made up of frame members arranged at positions corresponding to the ridge lines of a V rectangular parallelepiped, and has a front frame 2 and a rear frame 3. It is equipped with a side frame 4.5. A pedestal 7 for the molding material 6 is arranged in front of the front frame 2. This pedestal 7 consists of a table 8 and an underframe 9, and the molding material 6 to be molded is placed on the upper surface of the table 8. is placed between two films as described below. Further, a primary roller 12 consisting of an upper roller lO and a lower roller l] is mounted on the front frame 2 so as to be freely rotatable. Among these, a plurality of circumferential grooves 13, 13, . . . 13 are formed at a predetermined pitch in the axial direction on the upper roller lO.

On the other hand, a heating surface plate 14 whose upper surface coincides with a horizontal plane is installed in the molding machine frame 1, and as is clear from FIGS. 2 and 3, this heating surface plate 14 is moved up and down by air pressure. It can be raised and lowered by a cylinder device 15, and a guide rod 16 is used to enable parallel movement of the heating surface plate 14.
．． 16 are used.

Further, the primary roller 1 is provided on the top surface of the front frame 2 and the rear frame 3.
Racks 17 and 18 are respectively fixed in parallel to 2. These rack teeth have a pinion gear 19
．． 20 are engaged, and the pinion gears 19 and 20 can be moved over the rack teeth by operating a handle (not shown). These pinion gears 19 and 200 are connected by a shaft 21, and from this shaft 21 a platen) 22,
23 is suspended below, and a secondary roller 24 is rotatably supported at the tip of this bracket 22,23. The secondary roller 24 is arranged such that its axis is perpendicular to the axis of the primary roller 12, and the secondary roller 24 is
It is configured to be able to move up and down using a pneumatically operated lifting cylinder device (not shown).

Further, in the molding machine frame 1, there is a puller for pulling the molding material 6, which has been sandwiched between the upper and lower films and passed between the primary rollers 12 and pre-impregnated and defoamed, to a predetermined position in the frame. A separate device 25 is provided. This separation device 25 is connected to the molding machine frame 1 as shown in FIG.
It has a pair of endless drive chains 26, 27 installed horizontally and facing each other inside the side frame 4.5. A film gripping jig n is horizontally installed at a corresponding position on the drive chain 26, 27. As shown in FIG. 5, this film gripping jig 28 has a groove 28a into which the overlapping ends of upper and lower films 29a and 29b can be inserted, and the ends of the film are fixed by a clamp plate 30 and bolts 31. It is possible to hold it. According to the separating device 25 configured in this way, the tips of the upper and lower films 29a and 29b holding the forming material 6 are held by the film gripping jig 28, and the drive chains 26 and 27 are held in the direction of the arrow by, for example, manual handle operation. By driving it downward, it can be pulled to a predetermined position directly above the heating surface plate 14.

Furthermore, a heating surface plate 14 is provided in the molding machine frame 1.
A film fixing frame 32 parallel to y is fixed to the upper surface of the film. The film fixing frame 32 has a U-shaped planar shape and is constituted by a channel member with an opening groove facing outward. The upper film 29a and lower film 29b surrounding the pre-impregnated molding material 6 by passing between the primary rollers 12 are pulled into a predetermined position within the molding machine frame 1 by the separation device 25, and then It is fixed to the film fixing frame 32.

For this purpose, a lamp jig 33 as shown in FIG. 6 is used. That is, in the illustrated example, the upper and lower films 29a
, 29b are wrapped around the lower flange 32a of the film fixing frame 32, and an L-shaped clamp material 34 is placed on top of the film and clamped by the clamp jig 33.

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

A 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, etc. are used as the reinforcing fiber. Further, as the film, a polyvinyl alcohol film or the like is used.

First, a lower polyvinyl alcohol film 291) is placed on the table 8 of the pedestal 7, and a glass fiber cloth cut to a predetermined size is placed thereon. Place a predetermined amount of unsaturated polyester resin on the glass fiber and spread it lightly over the entire surface. Preparation of the molding material is completed by setting the upper film 29a thereon. Next, the tips of the upper and lower films 29a and 29b containing the forming material 6 are passed between the primary rollers 12, and then held by the film gripping jig 28, and the separation device 25 is driven to remove the primary roller 1.
2 is pre-impregnated and defoamed at the same time. At this time, it is preferable to fold back both sides of the upper and lower films 29&, 29b in order to prevent the resin from flowing out. Next, the periphery of the film is fixed onto the film fixing frame 32 using a clamp jig 33.

After that, the lifting cylinder device 15 is driven, and the surface plate 14 is
as shown in FIG.
Apply tension to 9kl. While holding the surface plate 14 shown in FIG. 3, the secondary roller U is pressed against the ridged surface of the forming material 6 using an air cylinder, and the rack gears 19 and 20 are rolled by manual operation. Secondary roller 24
The molded material 6 is stretched in the transverse direction while being subjected to a traverse motion in the direction of arrow B to perform impregnation and defoaming. At this time, the excess resin left in the band shape when the primary roller 12 passes is pressed by the secondary roller, and the shortage of resin during tentering can be effectively compensated for. Once the product molded in this way has hardened, it is removed from the mold to complete the work.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, after the forming material sandwiched between two films is pre-impregnated and defoamed with the primary roller, the surface plate is pushed up to apply tension to the film. Since the finishing impregnation and defoaming is performed using a secondary roller, large panels of reinforced plastic can be manufactured at low cost without requiring upper and lower molds or press equipment as in the past.

In addition, since ridges are left on the surface when the material is passed through the primary roller for preliminary impregnation treatment, tenterization can be easily performed when impregnation and defoaming treatment is performed using the secondary roller.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a molding device used in the molding method according to the present invention, and FIG. 2 is a side view showing the state before the heating surface plate is pushed up after the preliminary money is deposited by the primary roller. , Figure 3 is a side view showing the state of the heating surface plate after being pushed up;
Figure 4 is a perspective view schematically showing the film pulling device, Figure 5 is a perspective view showing the clamping state of the film gripping jig, and Figure 6 is a diagram showing the film gripping state by the clamping jig. It is. DESCRIPTION OF SYMBOLS 1... Frame, 6... Molding material, 12... Primary roller, 13... Circumferential groove, 14... Heating surface plate, 24
...Secondary roller, 25...Traction device, 26.27
... Drive chain, 28... Film gripping jig.

Claims (1)

[Claims] The forming material is sandwiched between two films, and the forming material is passed through a primary roller with multiple circumferential grooves on the outer periphery, leaving band-like ridges on the surface of the forming material while pre-impregnating and removing it. A process of foaming, a process of pushing up a surface plate from the bottom surface of the film while applying tension to the film, and a process of finishing the molding material by rolling the secondary roller in a direction perpendicular to the direction of sheet passing with respect to the primary roller, impregnating and defoaming. A method for forming a composite material, comprising the steps of: