JPH0872081A - Manufacture for fiber reinforced plastic molded part - Google Patents

Abstract

PURPOSE: To eliminate a conventional concern that air is included between a fluid material to be poured and a core pattern at the time of pouring fluid material onto the core pattern, by which some defect is generated in a compression molded part. CONSTITUTION: At the time of pouring a fluid material M onto the protruding part 2a of a core pattern 2 for compression molding, resistance going out to the peripheral end part of the fluid material M stored in a supply container 3 is given by the formation of a rough surface 3a, for example.

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. 9 (a), the fluid material M is stored in advance in the supply container 3 having an upper opening, and the cavity mold is lifted and separated by 0.1 above the core mold 2. .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. 9B, and the fluid material M is naturally dropped. By doing so, as shown in FIGS. 9 (c) and 9 (d), 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. Further, in order to facilitate the natural fall of the fluid material M, the plastic sheet 5 is usually interposed between the supply container 3 and the fluid material M.

[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. Between the fluid material M and the convex portion 2a of the core mold 2 shown in FIG.
(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. It is characterized in that it provides withdrawal resistance to the peripheral portion of the fluid material.

[0005]

According to the method of the present invention having the above characteristics, when the flowable material is sprayed and supplied, withdrawal resistance is imparted to the peripheral portion of the flowable material contained in the supply container. When the flowable material is sprayed and supplied, the falling resistance prevents or delays the natural fall of the flowable material in the peripheral portion of the supply container. Therefore, the flowable material in the central portion of the supply container is
The free-falling material preferentially falls over the fluid material in the peripheral portion. As a result, first, the fluid material of the central portion is first supplied to the central portion on the core die, and then the air that is about to be caught during the supply is pushed out toward the outer peripheral edge of the core die, The flowable material at the peripheral portion is delayedly supplied onto the core mold. 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, the inner surface of the peripheral wall portion of the supply container is previously formed into an uneven surface, and the fluidity is generated by the frictional force generated by the uneven surface during the supply of the rake. When the escape resistance is applied to the peripheral edge portion of the material, the above-described actions and effects can be produced by a simple means of simply forming the inner surface of the peripheral wall portion of the supply container on the uneven surface.

In addition, a protrusion protruding into the supply container is formed in advance on the upper edge of the peripheral wall of the supply container.
At the time of supplying the shots, in the case of imparting withdrawal resistance to the peripheral edge portion of the fluid material by the locking force by the protrusion,
The above-described actions and effects can be produced by a simple means of simply forming the protrusion on the upper edge of the peripheral wall of the supply container.

In addition, the inner surface of the peripheral wall of the supply container is formed in advance as an inclined surface whose upper edge portion has a diameter smaller than that of the bottom edge portion. In the case of imparting withdrawal resistance to the peripheral portion of the fluid material, the above-described action and effect can be produced by a simple means of simply forming the inner surface of the peripheral wall portion of the supply container on the inclined surface.

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 peripheral wall portion of the supply container, and when the hammering supply is performed,
When the pullout resistance is given to the peripheral portion of the fluid material by the locking force due to the protrusion of the protruding member, the timing of advancing the rod of the cylinder can be appropriately selected. By the locking force due to the protrusion, it is possible to more surely suppress or delay the natural fall of the fluid material in the peripheral portion in the supply container, and thus,
The above-described actions and effects can be produced more reliably.

[0011]

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 an overall cup-like shape (in this embodiment, 2).
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, a fluidity for forming the molded product is formed in a supply container 3 having an upper surface opened and an inner surface of the peripheral wall portion formed into an uneven surface 3a. A material M (specifically, a bulk molding compound having fluidity) is stored in advance. The inner surface of the peripheral wall of the supply container 3 is formed on the uneven surface 3a because of the existence of the uneven surface 3a, when the fluid material M, which will be described later, is sprayed onto the core mold 2. This is because a frictional force capable of giving resistance to slipping out is generated at the peripheral portion of the fluid material M. Further, 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. The plastic sheet 5 follows the shape of the uneven surface 3a when the fluid material M is stored in the supply container 3. Then, as shown in FIG. 1, the supply container 3 is moved above the core mold 2 in which the cavity mold 1 is lifted and separated by 0.1 to 1.0 m and below the cavity mold 1. Then, by inverting the supply container 3 as shown in FIG. 2, the fluid material M is transferred to the convex portion 2 of the core mold 2.
3 is sprayed onto the core a and then the cavity mold 1 is moved downwardly toward the core mold 2 as shown in FIGS. 4 and 5, so that the fluid material M is mixed with the fibers. It is compression molded into a reinforced plastic molded product.

According to the method of the present invention as described above, when the fluid material M is sprayed and supplied, the rugged surface 3a imparts withdrawal resistance to the peripheral portion of the fluid material M contained in the supply container 3. Therefore, when the fluid material M is sprayed and supplied, the natural resistance of the fluid material M at the peripheral portion of the supply container 3 is suppressed or delayed due to the escape resistance. Therefore, the fluid material M in the central portion of the supply container 3 spontaneously falls preferentially to the fluid material M in the peripheral portion. As a result, first, the fluid material M in the central portion is first supplied to the central portion on the core mold 2, and then the air A that is about to be caught during the supply is pushed toward the outer peripheral edge of the core mold 2. The flowable material M at the peripheral portion 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. Various modifications are conceivable as the supply container 3 to which the withdrawal resistance can be added. For example, as shown in FIG. 6, an annular protrusion 3b that projects into the container is formed at the upper edge of the peripheral wall, and the fluid material M is locked by the locking force of the protrusion 3b.
It is conceivable that the supply container 3 is configured so as to be able to give resistance to slipping out at the peripheral portion of the. Further, as shown in FIG. 7, the inner surface of the peripheral wall portion is formed into an inclined surface 3d whose upper edge is smaller in diameter than the bottom edge, and the fluid material M
It is conceivable that the supply container 3 is configured so as to be able to give resistance to slipping out at the peripheral portion of the. In addition, as shown in FIG. 8, projecting members 3e that are projectable into the container by the rod advancing operation of the cylinder 4 are attached to the peripheral wall portion at a plurality of positions in the circumferential direction, and the locking force by the projecting of these projecting members 3e is set. Then, the supply container 3 in which the withdrawal resistance can be given to the peripheral portion of the fluid material M can be considered.

Further, in the above-described embodiment, the bath made of fiber reinforced plastic is compression molded, but when manufacturing the 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.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[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 a longitudinal sectional view showing another embodiment of the supply container used in the method of the present invention.

FIG. 7 is a longitudinal sectional view showing another embodiment of the supply container used in the method of the present invention.

FIG. 8 is a vertical sectional view showing another embodiment of the supply container used in the method of the present invention.

FIG. 9 is an explanatory diagram showing a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 cavity type 1a concave part 2 core type 2a convex part 3 supply container 3a uneven surface 3b protruding part 3d inclined surface 3e protruding member 4 cylinder M fluid material

Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location B29L 22:00 (72) Inventor Eiji Doi 1 at 2 Takamatsu, Konishi-cho, Koga-gun, Shiga Prefecture Kubota Shiga Factory

Claims (5)

[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 article, which imparts withdrawal resistance to the peripheral portion of the fluid material (M) housed in the supply container (3) when it is sprayed and supplied upward. 2. The inner surface of the peripheral wall portion of the supply container (3) is previously formed with an uneven surface (3a), and the fluid material is frictionally generated by the uneven surface (3a) at the time of supplying the strike. The method for producing a fiber-reinforced plastic molded product according to claim 1, wherein the peripheral edge portion of (M) is provided with a slip-out resistance. 3. The upper edge of the peripheral wall of the supply container (3),
In advance, a protrusion (3b) protruding into the supply container (3)
2. The fiber-reinforced plastic molded article according to claim 1, wherein the fiber-reinforced plastic molded article is formed by forming a groove, and imparting withdrawal resistance to a peripheral edge portion of the fluid material (M) by a locking force of the projection portion (3b) at the time of supplying the hammering. Production method. 4. The inner surface of the peripheral wall portion of the supply container (3) is formed in advance on an inclined surface (3d) whose upper edge portion has a diameter smaller than that of the bottom edge portion, and the inclined surface (3d) is supplied at the time of the above-mentioned blunt supply. Surface (3
The method for producing a fiber-reinforced plastic molded article according to claim 1, wherein the locking force according to (d) imparts resistance to slip-out to the peripheral portion of the fluid material (M). 5. The peripheral wall portion of the supply container (3) is previously provided with
A projecting member (3e) which is projectable into the supply container (3) by the rod advancing operation of the cylinder (4) is attached in advance, and at the time of the above-mentioned supply, the locking force by the projecting of the projecting member (3e) causes The method for producing a fiber-reinforced plastic molded article according to claim 1, wherein the flowable material (M) is provided with resistance to slip-out at a peripheral portion thereof.