JPH0872073A - Method for producing fiber-reinforced plastic molded product - Google Patents

Abstract

(57) [Summary] [Purpose] At the time when the fluid material is sprinkled and supplied onto the core mold, air is caught between the sprinkled and supplied fluid material and the core mold, The conventional problem that a defect occurs in the compression molded product due to the air entrainment is avoided. [Structure] When the fluid material M is hammered and supplied onto the convex portion 2a of the core mold 2 for compression molding, the central portion on the bottom side of the fluid material M housed in the supply container 3 is pushed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber-reinforced plastic molded product, and more specifically, a method for producing a fiber-reinforced plastic molded product. A cavity mold with a recess corresponding to the outer surface shape of the main part of the fiber-reinforced plastic molded product is provided so that it can be separated and approached by raising and lowering, and the fluid material of the fiber-reinforced plastic molded product is placed in the supply container at the top opening. By storing the container in advance and moving the supply container above the core mold in which the cavity mold is lifted and separated and below the cavity mold and inverting the supply container, the flow After supplying the elastic material onto the convex portion of the core mold and moving the cavity mold downwardly toward the core mold, the fluid material is mixed with the fiber-reinforced plastic. Method for producing a fiber reinforced plastic molded article compressed into click molded article related.

[0002]

2. Description of the Related Art A method for producing such a fiber-reinforced plastic molded article (hereinafter simply referred to as "molded article") is based on a material for molding a fiber-reinforced plastic having fluidity such as a bulk molding compound (hereinafter referred to as "fluid material M"). )
Is supplied onto a core mold having a convex portion corresponding to the inner surface shape of the main part of the molded product (more specifically, on the convex part of the core mold), and then the core mold and the main part of the molded product. Manufacture of fiber reinforced plastic moldings such as artificial marble tubs and fiber reinforced plastic tubs by compression molding (see FIGS. 4 and 5) with a cavity mold having a recess corresponding to the outer surface shape. Is used to By the way, the supply of the fluid material M onto the core mold prior to the above-mentioned compression molding is usually performed in the following procedure. That is, as shown in FIG. 8A, the fluid material M is stored in advance in the supply container 3 having an upper surface opening, and the cavity mold is lifted above the core mold 2 by 0.1. .About.1.0 m and below the cavity mold, the supply container 3 is moved, the supply container 3 is inverted as shown in FIG. 8B, and the fluid material M is naturally dropped. By doing so, as shown in FIGS. 8C and 8D, the fluid material M is sprinkled and supplied onto the convex portion 2a of the core mold 2. As the supply container 3, conventionally, a container in which the fluid material M is housed is formed into a simple cubic or rectangular parallelepiped shape. In order to facilitate the free fall of the fluid material M, a plastic sheet 5 is usually interposed between the supply container 3 and the fluid material M, and the supply container 3 is provided with a plastic sheet 5. The inner surface of the peripheral wall portion was provided with a slight draft (5 ° to 20 °).

[0003]

By the way, since the shape of the accommodation space for the fluid material M in the supply container 3 is conventionally formed as a cuboid or a rectangular parallelepiped, the fluid material accommodated in the accommodation space is formed. M is stored evenly in the central portion and the peripheral portion of the storage space and tries to fall equally. As a result, when the fluid material M is sprayed onto the core mold 2, it is sprayed and supplied. 8 between the fluid material M and the convex portion 2a of the core mold 2.
(C) As shown in (D), the air A that cannot escape in the direction of the outer peripheral edge comes to be entrained, and a defect occurs in the molded product obtained by the compression molding due to the entrainment of the air. There was a problem. The present invention has been made by paying attention to such an actual situation, and an object thereof is to provide a means for avoiding the above-described problem of defect occurrence.

[0004]

A method for producing a fiber-reinforced plastic molded product according to the present invention (hereinafter referred to as the method of the present invention) is a core provided with a convex portion corresponding to the inner surface shape of a main part of the fiber-reinforced plastic molded product. A cavity mold having a recess corresponding to the outer shape of the main part of the fiber-reinforced plastic molded product is provided above the mold so that the cavity mold can be separated and approached freely by raising and lowering, and the fiber-reinforced plastic molding is provided in a supply container with an upper opening. The fluid material of the product is stored in advance, and the supply container is moved over the core mold in which the cavity mold is lifted and separated and below the cavity mold, and the supply container is inverted. By supplying the fluid material onto the convex portion of the core die by supplying the fluid material, the cavity die is moved downwardly closer to the core die, and the fluid material is moved forward. A method for producing a fiber-reinforced plastic molded product by compression-molding into a fiber-reinforced plastic molded product, wherein the fluid material is beaten and supplied onto the convex portion of the core mold, and is housed in the supply container. The feature is that the center part on the bottom side of the fluid material is pushed.

[0005]

According to the method of the present invention having the above characteristics, the bottom central portion of the fluid material contained in the supply container is pushed when the fluid material is sprayed and supplied. The fluid material contained in the central portion is preferentially pushed downward and preferentially falls spontaneously with respect to the fluid material contained in the peripheral portion of the supply container.
Therefore, when the flowable material is sprayed and supplied, first, the flowable material in the central portion is preferentially supplied so as to come into contact with the center portion on the core mold first, and then the air that is about to be caught during the supply is supplied. While extruding toward the outer peripheral edge of the core die, the fluid material at the peripheral edge is supplied to the core die with a delay. Therefore, it is possible to prevent air from being trapped between the flowable material supplied by spraying and the core mold as in the conventional case.

[0006]

Therefore, it is possible to avoid the occurrence of defects in the molded product due to the air entrainment that has conventionally occurred.
The object of the present invention is achieved.

In the method of the present invention having the above characteristics, an air vent hole is formed in the center of the bottom wall of the supply container in advance, and at the time of the above-mentioned hammering supply, the air is removed from the inside of the supply container via the air vent hole. Air is allowed to naturally flow behind the bottom central portion of the fluent material (i.e., with the reversal of the supply container, the pressure behind the bottom central portion of the fluent material and the air vent hole). In the case where a pressure difference is generated between the pressure in the outer space of the supply container and the pressure difference causes air to naturally flow in behind the central portion on the bottom side), an air vent hole is simply formed in the central portion of the bottom wall. The above-described actions and effects can be produced by such simple means. In addition, if the air is forced to flow to the back of the central portion on the bottom side through the air vent hole, the above-described actions and effects can be surely produced.

Further, a projecting member which is capable of projecting into the supply container by a rod advancing operation of a cylinder is previously attached to a central portion of a bottom wall of the supply container, and at the time of the above-mentioned sprouting supply,
When the protrusion member is protruded and the bottom side central portion of the fluid material in the supply container is pushed from behind, the timing for advancing the rod of the cylinder can be appropriately selected. The pushing of the fluid material in the central portion by the protrusion of the projecting member can be performed, and the subsequent pushing ensures that the fluid material in the central portion is preferentially supplied. Therefore, as described above, The action and effect can be more reliably produced.

Further, the bottom wall of the supply container is formed in advance in the shape of a diaphragm that can be inflated and deformed into the container, and the diaphragm-shaped bottom wall is pushed from behind at the time of the above-mentioned supply. In this case, since the expansion and deformation of the diaphragm-shaped bottom wall, that is, the expansion and deformation peculiar to the diaphragm in which the central portion of the bottom wall projects more than the peripheral portion, occurs at the time of the above-mentioned expansion and deformation. Therefore, the pushing of the fluid material in the central portion is surely performed. Therefore, based on the reliable boosting of the fluid material, preferential supply of the fluid material in the central portion is surely performed, so that the above-described action and effect can be reliably produced. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show one embodiment of the method of the present invention. In the drawings, the portions denoted by the same reference numerals as the conventional example indicate the same or corresponding portions.

Reference numeral 2 in FIG. 1 denotes a fiber-reinforced plastic molded product having a cup-shaped overall shape (in this embodiment,
A core mold as one of molds used for manufacturing a bath made of fiber reinforced plastic (for example, artificial marble), hereinafter simply referred to as a molded product, and the core mold 2 is
As shown in FIG. 4 and FIG. 5, a convex portion 2a corresponding to the inner surface shape of the main part of the molded product is provided. The core mold 2 is arranged so as to form an upper and lower pair with the cavity mold 1 having the concave portion 1a corresponding to the outer surface shape of the main part of the molded product. More specifically, the cavity mold 1 is arranged above the core mold 2 so that the cavity mold 1 can be separated and approached by moving up and down. When manufacturing the molded product, as shown in FIG. 1, the molded product is formed in a supply container 3 having an upper surface opened and an air vent hole 4 formed in the center of the bottom wall. A fluid material M (specifically, a bulk molding compound having fluidity) is stored in advance. still,
In order to facilitate the free-fall of the fluid material M described later, the plastic sheet 5 is interposed between the supply container 3 and the fluid material M as in the conventional case, and moreover, the plastic container 5 is provided. The inner surface of the peripheral wall has a slight draft (5 ° to 20 °). Then, the cavity mold 1 is lifted and separated by 0.1 above the core mold 2.
~ 1.0 m, and below the cavity mold 1,
As shown in FIG. 1, by moving the supply container 3 and reversing the supply container 3 as shown in FIG. 2, the fluid material M is transferred onto the convex portion 2a of the core mold 2 as shown in FIG. After supplying as shown in the figure, the cavity mold 1 is moved downwardly toward the core mold 2 as shown in FIGS. 4 and 5, and the fluid material M is compressed into the fiber-reinforced plastic molded product. Mold.

According to the method of the present invention as described above, the supply container 3 is placed on the core mold 2 when the fluid material M is sprayed and supplied.
Between the pressure behind the bottom central portion of the fluid material M in the supply container 3 and the pressure in the outer space of the supply container 3 via the air vent hole 4 with the reversal. A pressure difference is generated, and the pressure difference causes air to naturally flow behind the center portion on the bottom side. Therefore, the air inflow pushes the bottom central portion of the fluid material M accommodated in the supply container 3, and the fluid material M accommodated in the central portion of the supply container 3 is pushed by the subsequent pushing. The fluid material M accommodated in the peripheral portion of 3 is preferentially pushed downward and preferentially falls naturally. Therefore, at the time of the above-mentioned supply, the fluid material M at the central portion is first preferentially supplied so as to come into contact with the central portion on the core mold 2 first, and then the air A which is about to be caught at the time of the supply is cored. While being extruded toward the outer peripheral edge of the mold 2, the fluid material M at the peripheral edge is supplied onto the core mold 2 with a delay. Therefore, it is possible to prevent the air A from being trapped between the fluid material M supplied by spraying and the core mold 2 as in the conventional case.

Next, another embodiment will be described. An air supply pipe (not shown) with a valve (always closed) is connected to the air vent hole 4 formed in the center of the bottom wall of the supply container 3,
Another embodiment is conceivable in which the valve is opened to force the air to flow behind the central portion on the bottom side at the time of supplying the spray. According to this another embodiment, air can be forced to flow to the back of the bottom side central portion via the air vent hole 4 at the time of the shot supply, and by the forced inflow of the air, the fluid material of the central portion can be supplied. It is ensured that M is preferentially supplied to the central portion on the core mold 2.

Further, as shown in FIGS. 6 (a) and 6 (b), a projecting member 3e, which is projectable into the supply container 3 by the rod advancing operation of the cylinder 6, is attached to the center of the bottom wall of the supply container 3 in advance. Every time, the projecting member 3e is supplied at the time of the above-mentioned supply.
Another embodiment is conceivable in which the bottom side central portion of the fluid material M in the supply container 3 is pushed from behind by projecting. According to this another embodiment, as shown in FIG.
After the fluid material M is stored in the supply container 3 in advance, the supply container 3 is moved to the upper side of the core mold 2 and inverted, and then the rod 6 of the cylinder 6 advances as shown in FIG. 6B. Is performed at an appropriate timing, the fluid material M in the central portion can be pushed by the projection of the projecting member 3e at the optimal timing, and by the subsequent pushing, the fluid material M in the central portion is preferentially pushed. The supply will be ensured.

Further, as shown in FIGS. 7 (a) and 7 (b), the bottom wall 3f of the supply container 3 is formed in advance into a diaphragm-like one which can be expanded and deformed into the container by the rod advancing operation of the cylinder 7. Alternatively, another embodiment is conceivable in which the diaphragm-shaped bottom wall 3f is pushed backward from the rear when the shot is supplied. According to this another embodiment, as shown in FIG. 7 (a), the fluid material M is stored in the supply container 3 in advance, and the supply container 3 is moved over the core mold 2 and inverted. 7 (b), the rod of the cylinder 7 is advanced to expand and deform the diaphragm-shaped bottom wall 3f, that is, the central portion of the bottom wall 3f projects beyond the peripheral portion. That is, the expansion deformation peculiar to the diaphragm is generated, and based on the expansion deformation, the fluid material M in the central portion can be surely pushed. The expansion deformation of the diaphragm-shaped bottom wall 3f is
It can also be realized by blowing air behind the bottom wall 3f.

Further, in the above-mentioned embodiment, the bath made of fiber reinforced plastic is compression molded, but in the case of manufacturing the above-mentioned molded products other than the bath (for example, the septic tank and the wash bowl), It goes without saying that the present invention can be applied.

The compression molding may or may not be accompanied by heating.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a method of the present invention.

FIG. 2 is an explanatory view showing the method of the present invention.

FIG. 3 is an explanatory view showing the method of the present invention.

FIG. 4 is an explanatory view showing the method of the present invention.

FIG. 5 is an explanatory view showing the method of the present invention.

FIG. 6 is an explanatory view showing another embodiment of the method of the present invention.

FIG. 7 is an explanatory view showing another embodiment of the method of the present invention.

FIG. 8 is an explanatory diagram showing a conventional method.

[Explanation of symbols]

 1 Cavity type 1a Recessed part 2 Core type 2a Convex part 3 Supply container 3e Projecting member 3f Bottom wall 4 Air vent hole 6 Cylinder M Flowable material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiji Doi 1 at 2 Takamatsu, Kosai Town, Koga District, Shiga Prefecture Kubota Shiga Factory

Claims (4)

[Claims] 1. A recess corresponding to the outer shape of the main part of the fiber-reinforced plastic molded product is provided above a core mold (2) having a convex part (2a) corresponding to the inner surface shape of the main part of the fiber-reinforced plastic molded product. A cavity mold (1) provided with (1a) is provided so that it can be moved up and down freely by moving up and down, and a fluid material (M) of the fiber-reinforced plastic molded product is stored in advance in a supply container (3) having an upper opening. In addition, by moving the supply container (3) above the core mold (2) in which the cavity mold (1) is lifted and separated, and below the cavity mold (1), After the supply container (3) is inverted, the fluid material (M) is sprinkled and supplied onto the convex portion (2a) of the core mold (2), and then the cavity is attached to the core mold (2). The tee type (1) is moved downward to bring the fluidity A method for producing a fiber-reinforced plastic molded article, comprising compressing a material (M) into the fiber-reinforced plastic molded article, comprising: mixing the fluid material (M) with a protrusion (2) of the core mold (2).
a) A method for producing a fiber-reinforced plastic molded product, in which the center portion on the bottom side of the fluid material (M) housed in the supply container (3) is boosted when the liquid is poured onto the top. 2. An air vent hole (4) is formed in the center of the bottom wall of the supply container (3) in advance, and the supply container (3) is fed through the air vent hole (4) at the time of the above-mentioned blow supply.
The method for producing a fiber-reinforced plastic molded article according to claim 1, wherein air is allowed to naturally or forcedly flow into the inside of the fluid material (M) behind the bottom central portion thereof. 3. A projecting member (3e), which is projectable into the supply container (3) by a rod advancing operation of a cylinder (6), is previously attached to a central portion of a bottom wall of the supply container (3),
The fiber reinforced plastic according to claim 1, wherein the projecting member (3e) is projected during the above-mentioned blanket supply to push the central part of the bottom side of the fluid material (M) in the supply container (3) from behind. Molded article manufacturing method. 4. The bottom wall (3f) of the supply container (3)
A diaphragm-shaped member which can be inflated and deformed into a container is formed in advance, and the diaphragm-shaped bottom wall (3f) is pushed from behind at the time of supplying the hammering.
A method for producing the fiber-reinforced plastic molded article described.