JPH06335909A - Compression molding device - Google Patents

Abstract

PURPOSE:To provide an inexpensive compression molding device in which a molding having a good appearance is molded at a low cost by easily preventing moisture from infiltrating between a top force and a frame mold in a time for squeezing water by pressurization. CONSTITUTION:A compression molding device 1 is equipped with a bottom force 2, a top force 3 opposite to the bottom force 2 and a frame mold 4 which is slidably provided on the external circumferential face of the top force 3. Mortar 6 is pressurized between the top force 3 and the bottom force 2 and also surrounded by the frame mold 4 and molded while squeezing moisture contained in mortar 6 through many water squeezing holes provided in the bottom force 2. A packing 5 is provided in the position near to the molding face 31 of the top force 3 in the external circumferential face of the top force 3 so as to close a gap D between the top force 3 and the frame mold 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression molding apparatus adapted to perform pressure molding while absorbing moisture in a molding material.

[0002]

2. Description of the Related Art Generally, when manufacturing a molded article such as a cement roof tile, as shown in FIG. 3, a mortar d is sandwiched between an upper mold b and a lower mold c, and the outer peripheral portion of the mortar d is held. A frame die e, which is slidable, is slidably surrounded by the outer peripheral surface of the upper die b. A compression molding device a is known which is configured to absorb water in the mortar d through a large number of water squeezing holes provided in the lower mold c while pressurizing the upper mold b to perform compression molding. When molding is performed by such a compression molding device a, the water squeezed out from the mortar d remains in the gap f between the outer peripheral surface of the upper mold b and the inner peripheral surface of the frame mold e by the capillary phenomenon, and this water is decompressed. At the time of demolding, return water g is dropped and drops to adhere to the surface of the molded product h, resulting in deterioration of appearance.

Therefore, conventionally, in order to prevent moisture from remaining in the gap between the upper die and the frame die, a groove is provided on the outer peripheral surface of the upper die, and the water accumulated in the groove is compressed before the demolding. It is known that air is introduced and drained (see, for example, JP-A-55-23761).

[0004]

However, in the case of the above-described conventional compression molding apparatus, the upper mold and the frame mold must be special ones equipped with compressed air introduction means, drainage means, etc. The cost becomes high and the device becomes complicated. In addition, the number of manufacturing steps increases, and the manufacturing cost of the molded product increases, which is a disadvantage.

The present invention has been made in view of the above situation, and it is possible to easily prevent water from invading between the upper mold and the frame mold at the time of pressurized water squeezing so that a molded product having a good appearance can be manufactured at low cost. It is an object of the present invention to provide an inexpensive squeeze molding apparatus that can be molded.

[0006]

The squeeze molding apparatus of the present invention for solving the above problems is slidable on a lower mold, an upper mold facing the lower mold, and an outer peripheral surface of the upper mold. A frame mold, which pressurizes the mortar between the upper mold and the lower mold and surrounds it with a side frame, and molds while squeezing the water in the molding material from a large number of water squeezing holes provided in the lower mold. The molding device is configured to close the gap between the upper mold and the frame mold at a position near the molding surface of the upper mold on the outer peripheral surface of the upper mold or the inner peripheral surface of the frame mold. A packing is provided.

[0007]

According to the present invention, the elasticity of the packing closes the gap between the sliding surfaces of the upper mold and the frame during water compression under pressure, and prevents moisture in the molding material from entering the gap. You can

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of a molding process in the compression molding apparatus 1, and FIG. 2 shows an essential part of the molding process.

That is, the compression molding apparatus 1 includes a lower mold 2
And an upper die 3 and a frame die 4, and a packing 5 is attached to the upper die 3 so as to close the gap D between the sliding surfaces of the upper die 3 and the frame die 4.
Is provided.

The lower mold 2 has a draining iron plate 21 formed on the surface thereof. The water draining iron plate 21 has a large number of water-permeable holes (not shown) on its surface. The water can be squeezed from the mortar 6 placed on the draining iron plate 21 through the water-permeable holes (not shown) of the draining iron plate 21.

The upper die 3 is arranged so that its molding surface 31 faces the draining iron plate 21 of the lower die 2 and moves up and down. A frame die 4 is slidably provided on the outer peripheral surface of the upper die 3. The mortar 6 is sandwiched between the lower mold 2 and the upper mold 3, and the outer peripheral portion of the mortar 6 is surrounded by the frame mold 4, so that the mortar 6 can be molded by applying a pressing force. There is. Further, a groove portion 32 is provided around the outer peripheral surface of the upper mold 3 at a position close to the molding surface 31 of the upper mold 3. The packing 5 can be fitted in the groove 32. As the packing 5, the gap D between the upper die 3 and the frame die 4 can be substantially closed by its elasticity, and the sliding between the upper die 3 and the frame die 4 is hindered. The material is not particularly limited as long as it does not exist, and materials composed of various elastic bodies such as synthetic rubber can be used.

Next, the operation of the compression molding device 1 will be described.

First, the mortar 6 is placed on the draining iron plate 21 of the lower mold 2, sandwiched by the upper mold 3, and the outer peripheral portion thereof is surrounded by the frame mold 4.

Next, when the mortar 6 is pressed by the upper mold 3, the water in the mortar 6 is squeezed out from the draining iron plate 21 of the lower mold 2, and the mortar 6 is molded. At this time, since the packing 5 is provided on the upper mold 3 so as to close the gap D between the upper mold 3 and the frame mold 4, it is possible to prevent the water from the mortar 6 from entering the gap D. It

After the mortar 6 is pressed and molded by this operation, the upper mold 3 and the frame mold 4 are released. Even if the upper die 3 and the frame die 4 are operated during this demolding, the upper die 3
Since moisture does not enter the gap D between the mold 4 and the frame mold 4, it is possible to prevent return water from adhering to the molded product 60 and obtain a good molded product 60.

In this embodiment, the packing 5 is provided on the outer peripheral surface of the upper die 3 to close the gap D between the upper die 3 and the frame die 4. However, if the gap D can be closed, In particular, the packing 5 is not limited to being provided on the upper mold 3, and the packing 5 may be provided on the inner peripheral surface of the frame mold 4 to close the gap D.

[0018]

As described above, according to the present invention, moisture can be prevented from entering the gap between the sliding surfaces of the upper die and the frame die with a simple structure provided with packing. ,
A good molded product that is not contaminated by return water at the time of demolding can be obtained at low cost.

Also, since the packing has a simple structure and no special means for draining the return water is required,
The molding apparatus itself can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a schematic process diagram showing an operation of a compression molding device during molding.

FIG. 2 is a schematic process diagram showing an operation of a main part at the time of molding of the compression molding device.

FIG. 3 is a schematic process diagram illustrating a conventional general compression molding.

[Explanation of symbols]

 1 Squeeze molding device 2 Lower mold 3 Upper mold 31 Molding surface 4 Frame mold 5 Packing 6 Mortar (molding material) D Gap

Claims (1)

[Claims] 1. A lower die, an upper die facing the lower die, and a frame die slidable on an outer peripheral surface of the upper die,
Press molding that presses the molding material between the upper mold and the lower mold, surrounds it with a frame mold, and molds while squeezing the water in the molding material from the many water holes provided in the lower mold. A device, wherein a packing configured to close the gap between the upper mold and the frame mold is provided at a position near the molding surface of the upper mold on the outer peripheral surface of the upper mold or the inner peripheral surface of the frame mold. A squeeze molding device characterized in that