JPH06262689A - Frp forming mold - Google Patents

Abstract

PURPOSE:To effect a delustering treatment onto the surface of an FRP molded form simply promptly, and effect repair of a mold (FRP mold) readily. CONSTITUTION:At the time of performing a blast work on the mold surface of an FRP forming mold (FRP mold) 10, a superficial hardness of the FRP forming mold is set into an incompletely cured condition at a Barcol hardness of 20-25, and a fine and uniform unevenness is formed on the surface of the FRP forming mold 10, and then a heat treatment is given thereto, so that a superficial hardness of the FRP forming mold 10 is made into a Barcol hardness of 45 or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a FRP molding die (FRP) for molding a fiber reinforced plastic (hereinafter referred to as FRP) molded product requiring a matte finish such as a vehicle interior material and a casing of OA equipment. Type).

[0002]

2. Description of the Related Art Conventionally, the following methods (1) to (4) have been carried out in order to perform matting treatment on an FRP molded article. (1) A mold release agent having a matting function is applied to the surface of a molding die (FRP type) every time molding is performed. (2) The wooden mold or the master mold is subjected to the matting treatment of (1) and inverted to the molding die (the molding die becomes a matte state). (3) Fine irregularities are formed by blasting on the completely cured mold. (4) Matte coating is applied to the molded product (the surface of the molded product has a general gloss finish).

[0003]

As described above, in the conventional delustering treatment, for example, in the method of applying the delustered release agent to the mold as in (1), the following drawbacks are encountered. was there. <1> Since fine particles adhere to the surface of the molding die to form a convex shape, a concave hole is formed on the surface of the molded product to be reversed, so that dirt is clogged in the concave part and cleaning is poor (dirt does not easily come off). . <2> There is a variation in gloss between the molded products because the molding process is performed each time. <3> When partly repairing a molded product, touch-up repair is performed with paint or the like, but a part of the concave shape of the molded product becomes a convex touch-up, so repair marks are conspicuous.

Further, in the case of using a wooden mold or a master mold and reversing it to a molding mold as in (2), the above-mentioned drawbacks of <1>, <2>, and <3> can be solved. There is a problem that it is difficult to repair when the molding die is damaged.

In addition, since (3) is blasted into a completely hardened mold, as shown in FIG.
Undercuts 2 and scratches 3 are formed on the surface of fine irregularities formed on the surface of the molding die 1, which deteriorates the releasability.

Further, since the mold release property of the molded product is poor, the draft must be set large, and the shape of the molded product is limited, and the method (4) of applying a matte coating is However, there are problems such as a significant increase in cost.

As described above, there are various problems as described above when the matting treatment is applied to the conventional FRP molded product.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable the surface of an FRP molded product to be matted easily and beautifully. To provide a mold.

[0009]

In order to achieve the above object, the FRP molding die according to the present invention is in an incompletely cured state in which the surface hardness (Barcol hardness) of the FRP molding die is set to 20-25. It is characterized in that after a certain mold surface is blasted to form uniform fine irregularities, heat treatment is performed so that the surface hardness of the mold surface becomes 45 or more, and the mold surface is completely cured.

[0010]

As apparent from the above construction, by setting the mold surface hardness at the time of blasting to an incompletely hardened state (surface hardness Barcol hardness 25 to 30), there is no surface destruction due to blast particle collision, and plastic balls, etc. Uniform depressions and projections can be formed due to indentation.

[0011]

EXAMPLES Hereinafter, a mold for FRP molding according to the present invention (FRP
Example) will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 1, when manufacturing the FRP molding die 10, the surface hardness (Barcol hardness) is 25 to 30.
Blasting is performed with the blast particles 11 such as plastic balls and alumina in the incompletely cured state.

In the present invention, the surface hardness of the FRP molding die 10 during blasting is important, and the blasting particles 11 are used.
As the material of (1), a plastic ball is preferable because particles remaining stuck to the surface of the molding die 10 after treatment may corrode and affect the surface of the molded product.

The size of the particles 11 and the spraying pressure are selected according to the required appearance of the molded product, and the particle size is 60-.
The mold release property is about 300 μm and about 5 to 20 μm from the depth of the unevenness on the surface of the molding die 10.

After the blasting treatment, the FRP molding die 10 is heat-treated to be completely cured (Barcol hardness of 45 or more).

Therefore, as shown in FIG. 2, the FRP molding die 10 according to the present invention has a structure in which the die surface is free from undercuts, scratches, etc. and has uniform fine irregularities.
In the unlikely event that the mold 10 is damaged or the like, it can be repaired quickly and uniformly by partially blasting it.

[0017]

As described above, the FRP according to the present invention
The molding die has the special effects described below. (1) By setting the mold surface hardness at the time of blasting to an incompletely hardened state, there is no surface destruction due to blast particle collision, and it is possible to easily form uniform unevenness due to blast particle penetration, and it is possible to perform accurate processing. Has the effect. (2) The matte roughness and pattern of the molded product can be changed by selecting the particle size of the blast and the spraying pressure, and the desired appearance can be arbitrarily set. (3) Since the undercut and fine scratches on the mold surface due to the blasting can be smoothed, it has the effect of improving the releasability of the product. (4) Furthermore, since no concave portion is formed on the molded product,
It has the effect of easily removing dirt and the like and improving the cleanability. (5) The surface defects of the molded product can be repaired inconspicuously by the convex matte coating similar to the convex surface of the molded product.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a blasting state of an FRP molding die according to the present invention.

FIG. 2 is an enlarged sectional view showing a mold surface of an FRP molding mold according to the present invention.

FIG. 3 is an enlarged cross-sectional view showing a mold surface of a conventional FRP molding mold.

[Explanation of symbols]

10 ... FRP mold (FRP type) 11 ... Blast particles

Claims (1)

[Claims] 1. A surface of a mold surface after blasting is performed on the mold surface in an incompletely cured state in which the surface hardness (Barcol hardness) of the FRP molding mold is set to 20 to 25 to form uniform fine irregularities. The mold surface is completely cured by heat treatment so that the hardness becomes 45 or more.
RP mold.