JPS6342813A - Method and apparatus for manufacturing resin molding - Google Patents

Abstract

PURPOSE:To shorten a molding cycle and to obtain a molding having a good surface condition, by pouring a molding resin in a mold wherein at least one of a male mold and a famele mold is made of a light-transmissive material and irradiating the resin with light capable of accelerating hardening of the resin. CONSTITUTION:A male mold 1 and a female mold 2 of an apparatus are made of a polycarbonate resin and FRP resectively. With the molds kept open, the surfaces of the molds are coated with a releasing agent and a sticky resin film sheet is sticked on the surface of the female mold 2 and a glass chopped strand mat is adhered thereon. Then, the male mold 1 is forwarded to close the mold and a polyester resin and a hardner are poured from a resin pouring hole 6. After the resin begins to be stored in the lower part of the cavity, an excimer-laser oscilator is operated to irradiate the resin with a laser beam by means of a reflection mirror 5 while it is successively oscillated from the lower part to the upper part of a molding material 3. After the irradiation is completed, the molding is taken out of the mold to obtain a FRP panel whose face of the reqired side is smooth and have no trace of sink mark in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing resin molded products, particularly FRP (fiber reinforced plastic) panels, and also relates to an apparatus therefor.

(Conventional technology) For example, steel plates are normally used as the material for the outer panels of automobile bodies, but in recent years steel plates have been developed that can be made lighter, have a greater degree of freedom in shape, do not cause rust, and are less susceptible to collisions. There is a demand for FRP panels to be made from FRP panels for reasons such as improved breakage resistance and protection for pedestrians, and some are now being put into practical use.

The manufacturing method includes resin injection method, V
ARI method and SMC method are generally adopted. To give an overview of these methods, first, in the resin injection method, a mold release agent is applied to the mold surface in advance, gel coat is sprayed, and glass fibers 13 are set in the mold as shown in Figure 2. After tightening the upper mold 11 and lower W 12 with bolts, pour the resin + curing accelerator, etc. into the mold as shown by arrow A (
It is press-fitted into a cavity) and cured at a temperature of 1 to 7 noodles/d at a temperature of 0°C.

In addition, in the VARI method, a dispersing agent is applied to the mold surface in advance, a gel coat is sprayed, and as shown in FIG. The upper die 11 is tightened with reduced pressure in direction B).
The resin is injected as shown by arrow A and cured at room temperature.

On the other hand, in the SMC method, the required amount of SMC15, which is a premix board made of resin and glass fiber, is cut and charged between an upper mold 11 and a lower mold 12, and then heated at a temperature of 120 to 150°C and a pressure of 30 to 200 Kf/j. It is hardened by high heat and high compression.

(Problems to be Solved by the Invention) However, each of the above conventional methods has the following problems.

That is, in the resin injection method and the VARI method, the only way to speed up curing is to add a curing accelerator to the resin or to place it under high temperature and high pressure, and even then, each molding cycle takes 40 minutes to half a day and 40 minutes to 150 minutes. Minutes and long,
However, in order to obtain a molded product with a good surface, there are many work steps such as spraying gel coat, etc., and both of the above methods have a problem in that the productivity is extremely low.

On the other hand, the SMC method has a short molding cycle of 3 to 6 minutes, and it requires enormous equipment costs when manufacturing large molded products such as automobile exterior panels, so it is not possible to mass produce denominations.
＠Profitability cannot be secured - 0 In addition, shrinkage of the solidified resin pulls the surrounding resin, glass fibers are exposed to the surface due to the resin sink, and voids are formed under the surface.
As a result, there are problems in that the surface of the molded product is rough, and that air bubbles generated from the voids burst during subsequent coating drying, making it impossible to achieve a good coating.

The present invention has been made to solve the above problems, and its objectives are to provide a surface that does not require large capital investment, has good workability, has a short molding cycle, and has good surface resistance. It is an object of the present invention to provide a method for manufacturing a resin molded product, which can obtain a molded product having the following characteristics, and an apparatus for the same.

(Means for Solving the Problems) In order to achieve the above object, the method for manufacturing a resin molded product according to the present invention is provided in a mold in which at least one of the male mold and the female mold is made of a translucent material. The method is characterized in that a molding resin is put therein and a light beam is irradiated to accelerate the curing of the resin.

The light beam irradiated onto the resin in the mold may be any light beam that can promote the curing of the resin, and may be appropriately selected depending on the type of the resin and the curing agent added if desired. For example, ultraviolet rays, CCh laser beams, YAG laser beams may be used, but excimer laser beams are particularly preferable, and while the resin is injected into the mold from the upper part of the mold, the laser beam is irradiated sequentially from the lower part of the mold to the upper part, It is best to cure the resin from the bottom to the top.

The present invention is particularly suitable for manufacturing FRP panels, in which case a resin film sheet is applied to the side of the mold on which a good surface is to be molded, a fiber material is loaded into the mold, and then the resin is applied. It is preferable to simultaneously inject the resin and irradiate it with light to simultaneously weld the resin and the resin film sheet and cure the resin.

As the injection resin and resin film sheet used here, unsaturated polyester resin, epoxy roving, and cloth can be used.

The apparatus of the present invention for carrying out the above method has a mold consisting of a male mold and a female mold, and at least one of the male mold and the female mold is a transparent mold made of a translucent material, and the molding is performed through the transparent mold. It is characterized by providing means for irradiating the resin inside the mold with light.

The transparent type may be anything as long as it has the required strength and transparency, for example, it is made of fat such as polyfluorocarbon resin or polycarbonate resin, or heat-resistant inorganic glass such as powder glass, lead glass, or quartz glass, and Examples include those with improved impact resistance.

The irradiation means preferably consists of an excimer laser oscillator and a movable reflector for changing the irradiation position of the laser beam. Activated, the resin hardens quickly. This makes it possible to shorten the molding cycle.

Furthermore, if the resin in the mold is cured from the bottom, even if resin sinks occur, the viscous liquid resin will fall from the top, so the effects of sinks will be almost eliminated.

If a resin film sheet is pasted on the mold surface in advance, the film sheet will be welded to the surface of the molded product, so that the surface of the molded product will be smooth.

The above effect can be more effectively achieved by using a molding device that uses a transparent mold, is preferably movable in the horizontal direction, and is equipped with a means for irradiating the resin.

(Example) An example of the present invention will be described below based on the drawings.

The first diagram is a sectional view of a main part of the molding apparatus of this embodiment, showing the state during molding. The male mold 1 of the device is a transparent mold made of polycarbonate resin, and the female mold 2 is made of FRP. The male mold holder 7, which has a holding arm part 8 and holds the male mold 1 fixedly, has a drive rod 1 connected to a hydraulic device (not shown).
It is movable in the back and forth direction CK via the holder 7, which allows the mold to be opened and the molds to be matched (mold clamped). The female mold holder 10 holding the female mold is fixed to a backup part (not shown) of this device.

The apparatus is also equipped with a laser oscillator 4 and a reflecting mirror 5 for changing the irradiation direction of the laser beam, and the reflecting mirror 5 is attached so as to be movable by an actuator (not shown).

The method for manufacturing resin molded products using this apparatus is described below aF! A.

First, with the mold open, apply a mold release agent to the mold surface, then apply an adhesive unsaturated polyester resin film sheet to the mold surface of female mold 2, and then apply the area weight! 200~450 f/
Attach Wl's glass chopped strand mat. Thereafter, the mold 1 is moved forward to perform mold matching, and a polyester resin and a curing agent are injected through a resin injection port 6 formed at the upper part of the mold. The resin is filled into the cavity by the sealing member 9 while permeating into the mat without falling out of the mold. After the resin begins to accumulate in the lower part of the cavity, the exhaust laser oscillator is activated and its wavelength 2
A laser beam of 000 to 5oooX is irradiated while being oscillated from the bottom to the top of the molding material 3 by a reflecting mirror 5 that gradually moves upward while vibrating from side to side.

After the irradiation is completed, by demolding, an FRP panel with a smooth desired side surface and no evidence of sink marks can be obtained within a short time.

It should be noted that the above-mentioned is only one example, and the purpose of the present invention,
Any modification or modification may be made without departing from the structure and effect. For example, the resin film sheet may be applied to the glass fiber mat in advance, or the fiber mat supported by clamps may be clamped by moving both molds. Furthermore, other than making the mold transparent and irradiating it with light such as a laser,
The resin molded product may be manufactured using various conventional molding methods.

(Effects of the Invention) According to the method and apparatus of the present invention, the following effects are achieved.

First, since the curing time of the resin is accelerated, the molding cycle can be significantly improved, and productivity is significantly improved.

The present invention can be applied to the conventional resin injection method, VAR
By applying this method to I method, SMC method, etc.), it becomes possible to use conventional incidental equipment as is, and to produce FRP automobile bodies, etc., without requiring almost any capital investment.

Historically, surface quality has been a problem in the past, but by curing the resin from the bottom to the top, it is now possible to reduce the effects of resin sink marks. By reacting and welding a resin film sheet to the surface, it became possible to obtain good surface quality.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part of a molding apparatus according to an embodiment of the present invention, and Figs. 2, 3, and 4 show conventional molding methods such as resin injection method, ARI method, and SMC, respectively.
It is an explanatory diagram of the law. In the figure,

Claims (6)

[Claims] (1) Resin molding characterized by placing a molding resin into a mold in which at least one of the male mold and the female mold is made of a translucent material, and irradiating the resin with a light beam that accelerates the curing of the resin. method of manufacturing the product. (2) The method according to claim 1, wherein the light beam that accelerates curing is an excimer laser beam. (3) While injecting resin into the mold from the upper part of the mold, a laser beam is irradiated sequentially from the lower part of the mold to the upper part, thereby curing the resin from the lower part to the upper part. The method described in Scope 1. (4) Apply a resin film sheet to the mold surface on the side to be molded to obtain a good surface, load the fiber material into the mold, then inject the resin and irradiate the resin film sheet with the resin. 4. The method according to claim 1, wherein the welding of the resin and the curing of the resin are performed simultaneously to obtain an FRP molded product. (5) It has a mold consisting of a male mold and a female mold, and at least one of the male mold and the female mold is a transparent mold made of a translucent material,
An apparatus for manufacturing a resin molded product, comprising means for irradiating the resin in the mold with light through the transparent mold. (6) The device according to claim 5, wherein the irradiation means comprises an excimer laser oscillator and a movable reflecting mirror for changing the irradiation position of the laser beam.