JPS5890915A - Molding mold for plate with holes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves hardening and pouring a liquid molding material, such as a mixture of powdered stone and resin such as polyester.
This invention relates to a mold for forming a plate such as a top plate having a hole for attaching a washbasin or the like.

As shown in FIG. 6A, this type of mold generally consists of a top mold A with a base 1 protruding inside, and a back mold B with a window hole 2 formed in the part facing the base 1. It is a mating type, and these types A and H form 2 in Fig. 1.

A plate 4 is molded having holes 3 for attaching a plate (not shown) or the like as shown.

In molding the plate 4 using the molds A and B, as shown in FIG. 6A, first the mold A is filled with a liquid molding material 4a which will become the plate 4. Next, as shown in Figure 6, the back mold B is mounted and fixed on A, and the molding material 4a is hardened in the mold.
After the molding material 4a has hardened, the mold is removed to obtain the plate 4 shown in FIG. 6C.

However, when using the above general mold, the following problems occurred during molding. That is, due to shrinkage stress during curing of the molding material 4a, the portion around the window hole 2 of the back mold B was deformed into a raised shape as shown by the imaginary line in FIG. 4, making it difficult to obtain the plate body 4 in the desired shape. It is.

The cause of the above-mentioned inconvenience is that the peripheral portion of the window hole 2 is weakened and has a free end due to the opening of the window hole 2.

In addition, it is common knowledge that the mold is made of a thin material such as fiber reinforced plastics (FRP) in order to reduce the manufacturing cost and to make it light and easy to demold. However, when formed with such a thin wall, the deformation becomes even more severe.

An object of the present invention is to provide a mold that does not easily undergo deformation even if the mold is formed with a thin wall. In a combination mold consisting of a back mold in which a window hole is bored in the part facing the part, the mold is a plate body with a hole and is equipped with a presser plate around the window hole of the back mold to hold down the surrounding part. be.

With this configuration, the presser plate suppresses upheaval deformation of the area around the window hole of the molded product during hardening, and it is possible to obtain a plate with holes in a desired shape. An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

That is, the mold of this embodiment has front and back molds A and B, and a presser plate 5 which is removably fixed to the upper surface of the base part 1 of the front mold A and has an external dimension slightly larger than the window hole 2 of the back mold B. After completely filling the molding material 4a into the front mold A and placing and fixing the back mold B thereon, the upper lip periphery 6a of the presser plate 6 is placed on the back mold B as shown in FIG. 3A. A presser plate 5 is fixed to the upper surface of the table part 1 of the table type A by contacting the peripheral part of the window hole 2 of the table. Numeral 6 is a bolt for fixing the presser plate 5 to the base part 1, and the bolt 6 is inserted through the entire hole 7 drilled in the presser plate 5 to the base part 1.
It is screwed into a screw hole 8 formed in.

9 shows a clamp for fixing the back mold B to the front mold A''2.

According to the above configuration, the window hole 2 of the back mold B is closed by the presser plate 5.
Since the surrounding area of the window hole 2 is pressed down from above, the shrinkage stress caused by the curing of the molding material 4a easily closes the window hole 2.
The surrounding portions are not deformed in an upheaval manner, so that the plate 4 having the desired shape as shown in the opening of FIG. 3 can be obtained.

In the above embodiment, the presser plate 5 was fixed on the base part 1 of the table type A, but as shown in FIGS. Various configurations are conceivable, such as protruding, placing it on the outer periphery of the mold, and fixing it together with the mold using a clamp 9. There is a small gap between the inner periphery of the window hole 2 and the holding plate 5 or 7 or the base part 1, and the molding material 4a penetrates into this gap, causing the plate body 4 to be damaged after molding. IJ 4 b is generated, but this is removed with a cutting tool or the like.

As explained above, according to the present invention, deformation does not easily occur around the window hole in the back mold, so that a plate having a desired shape can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a plate formed by a mold, FIG. 2 is an exploded perspective view of a mold showing an embodiment of the present invention, and FIG.
The mouth is a cross-sectional view of the mold during the same molding and a cross-sectional view of the molded product, FIG. 4 is a perspective view of the mold showing another embodiment of the present invention, FIG. 5 is the same cross-sectional view, and FIG. Figures 1 and 2 are cross-sectional views showing the order of molding using a general mold. 1...Base part, 2...Window hole, 5...
... Pressing plate, A ... Front mold, B ... Back mold. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 5 Figure 6

Claims (1)

[Claims] A pair of mating molds including a front mold having a pedestal inside and a back mold having a window hole bored in a part facing the pedestal and placed and fixed on the front mold, A mold for a plate with a hole, characterized in that it is equipped with a presser plate around the window hole to press the area.