JP2002307415A - Mold for press molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for press molding, capable of smoothly mold releasing in a simple facility and rapidly discharging air from a mold surface at the time of press molding. SOLUTION: The mold for press molding comprises an upper mold 1 and a lower mold 2 internally engaged with a frame-like side mold 3. The mold surface (lower surface) 4 of the upper mold 1 is made of a curved surface having recess positions 5. Vent holes 6 are provided so as to communicate with the innermost parts of the recess positions 5 through the exterior of the mold. The part opposed to the mold surface 4 of the hole 6 is constituted of a porous material 7. A vent hole 9 is provided vertically under the innermost part of the recess position 5 to communicate with the mold surface 8 through the exterior of the mold. A valve 10 is provided on the surface of the hole 9 opposed to the surface 8. The valve 10 is energized by a spring 11. The valve 10 is protruded from the surface 8 when the valve does not receive a load from the exterior.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press molding die, and more particularly to a press molding die suitable for pressing a plastic element such as clay or cement kneaded material to form a molded article of a desired shape. Regarding the mold.

[0002]

2. Description of the Related Art When molding a plate-like building material having an uneven surface, a plastic plate-like element such as clay or cement kneaded material (hereinafter, this element is sometimes referred to as a raw sheet) is used. 2. Description of the Related Art It has been widely practiced to accommodate a press-molding mold having an upper mold and a lower mold and press-mold it, and then perform hardening treatment and firing.

In press molding with such a mold,
If air remains between the inner surface of the mold and the green plate, a clear uneven pattern may not be transferred.

Therefore, the inner surface (mold surface) of the mold is communicated with the outside of the mold through a vent or the like, or the mold surface of the mold is made of a permeable porous material, and the mold surface is communicated with the atmosphere. Has been done. Further, at the time of demolding, air is blown through the air holes and the porous material to release the molded product from the mold surface.

[0005]

By supplying air to the air holes and the porous material, it is possible to perform the demolding smoothly, but a compressor and a pipe for supplying the air are required, and the equipment is required. Becomes a large scale.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a press molding die which can smoothly remove a mold with simple equipment and can quickly discharge air from the mold surface during press molding. I do.

[0007]

Means for Solving the Problems A press molding die according to the present invention is a press molding die for press-forming by pressing raw materials between the dies. In a press-molding die provided with a vent hole communicating with the mold, a valve projecting from the mold surface at the time of opening the valve than at the time of closing the valve is provided at a position facing the mold surface of the vent hole. In addition, an elastic member for urging the valve in the projecting direction is provided.

According to such a press molding die, when a raw material such as a raw plate is pressed between the dies and pressed, a valve is opened at an initial stage of the press, and a gap between the raw material and the mold surface is formed. Air is exhausted to the outside through the vent. When the press pressure is increased, the valve is pushed by the raw material and the valve closes, and press molding is performed. The valve in the closed state is urged by the elastic member to protrude when the mold is released, and separates the molded product from the mold surface. For this reason, demolding can be performed smoothly.

By forming the valve so as to be substantially flush with the mold surface when the valve is closed, the molded product has no or little mark on the valve.

In the present invention, the mold has an upper mold and a lower mold, and the valve is provided on a mold surface of the lower mold, and an upper portion of the mold surface of the upper mold above the valve. Is preferably a recess. At the time of press molding, since the raw materials move toward the concave portion of the upper die so that the raw materials are gathered, air tends to collect in the concave portion. Therefore, by making at least the mold surface facing the innermost part of the recess into a porous material, air that is going to accumulate in the recess can be discharged to the outside of the mold, and a clear pattern can be formed. Can be formed.

Further, as described above, when the raw materials move so as to be gathered toward the recess, the raw materials also tend to move not only along the upper mold surface but also along the lower mold surface. As a result, air tends to collect on the lower mold surface below the recess. Therefore, if the valve is arranged on the lower mold surface below the upper mold recess, the air that tends to remain along the lower mold surface can be smoothly discharged out of the mold.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a longitudinal sectional view of a press molding die according to an embodiment, and FIGS. 1B and 1C are FIGS.
It is an enlarged view of B and C part of (a).

In this press molding die, an upper die 1 and a lower die 2 are fitted inside a frame-shaped side die 3.
The lower mold 2 slides on the inner surface of the side mold 3 and is movable in the vertical direction.

The mold surface (lower surface) 4 of the upper mold 1 is a curved surface having a recess 5. This recess 5 is recessed compared to its surroundings. A ventilation hole 6 is provided so as to communicate the innermost part of the recess 5 with the outside of the mold (the upper surface of the upper mold 1 in this embodiment). The portion of the vent 6 facing the mold surface 4 is made of a porous material 7. In this embodiment, the porous material 7 is made of a porous metal sintered body, a porous synthetic resin,
It is composed of a nonwoven fabric or the like.

The mold surface (upper surface) 8 of the lower mold 2 is flat. In this embodiment, a ventilation hole 9 is provided vertically below the innermost part of the recess 5 to communicate the mold surface 8 with the outside of the mold (in this embodiment, the lower surface 9 of the lower mold 2). A valve 10 is provided on a surface of the ventilation hole 9 facing the mold surface 8. The valve 10 is urged by a spring 11, and the valve 10 projects from the mold surface 8 when no load is applied from the outside. When the valve 10 retreats most, it sits on the tapered portion 12 at the tip of the vent hole 9 and closes the vent hole 9. In this closed state, the upper surface of the valve 10 is substantially the same as the mold surface 8. Become flush.

In order to press-form building materials and the like using the press-molding die configured as described above, the raw material such as a raw plate is transferred to the lower die while the upper die 1 is separated from the side die 3. 2. Charge the raw materials by placing them on the top. Next, the upper mold 1 is fitted to the side mold 3 and the raw material is pressed.

At the beginning of the press, the valve 10 slightly protrudes from the mold surface 8, and the residual air between the mold surface 8 and the raw material is discharged through the ventilation hole 9. When the press pressure increases, the valve 10 is seated on the tapered portion 12 and the vent 9 closes. In this case, since the upper surface of the valve 10 is flush with the mold surface 8, no mark of the valve 10 is left on the lower surface of the molded product.

Also, during the pressing step, between the raw material and the mold surface 4, the raw material moves along the mold surface 4 toward the recess 5, and accordingly, the gap between the raw material and the mold surface 4 is increased. Air gathers in the recess 5. The air collected in the recess 5 passes through the porous material 7 and is discharged out of the mold through the vent hole 6.

As a result, the raw material is filled up to the innermost portion of the concave portion 5, and it is possible to form a molded product in which the irregularities of the mold surface 4 are clearly transferred.

When releasing the mold, the upper mold 1 is moved upward or the lower mold 2 is moved downward. When the upper mold 1 and the lower mold 2 are separated from each other in this manner, the press pressure applied to the molded product is released, so that the valve 10 projects upward by the pressing force of the spring 11, and the lower surface of the molded product and the mold Air enters through a vent hole 9 with the surface 8. Therefore, the molded product can be smoothly released from the mold surface 8.

Since air enters between the mold surface 4 of the upper mold 1 and the molded product through the air holes 6 and the porous material 7, the molded product is smoothly released from the mold surface 4. be able to.

The above embodiment is an example of the present invention, and the present invention can take other forms. For example, in the above embodiment, the valve 10 is provided only in the ventilation hole 9 of the lower die 2, but the valve 10 may be provided also in the ventilation hole 6 of the upper die 1. Also, the cross-sectional shape of the illustrated mold is an example of the present invention, and it is obvious that the cross-sectional shape of the mold other than that illustrated may be used.
Further, there is no limitation on the material of the raw material.

[0023]

As described above, according to the press molding die of the present invention, demolding can be smoothly performed with simple equipment, and air can be quickly discharged from the mold surface during press molding. it can.

[Brief description of the drawings]

FIG. 1 (a) is a longitudinal sectional view of a press-molding die according to an embodiment, and FIGS. 1 (b) and 1 (c) are B and B in FIG. 1 (a).
It is an enlarged view of C part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper mold 2 Lower mold 3 Side mold 4,8 Mold surface 5 Concave part 6,9 Vent 10 Valve

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G053 AA07 BE07 CA03 CA04 EA26 4G054 AA01 AB03 BA43 BA72

Claims (4)

[Claims] 1. A press-forming mold for press-forming by pressing raw materials between dies, the press-forming mold having a vent hole communicating a mold surface and the outside of the mold. In the mold, a valve protruding from the mold surface when the valve is opened is provided at a position facing the mold surface of the vent hole than when the valve is closed, and an elastic member for urging the valve in the projecting direction. A press molding die, characterized by being provided with: 2. The press molding die according to claim 1, wherein the valve is substantially flush with a mold surface when the valve is closed. 3. The mold according to claim 1, wherein the mold has an upper mold and a lower mold, and the valve is provided on a mold surface of the lower mold. A press molding die, wherein an upper part of the valve is a recess. 4. The mold according to claim 3, wherein the upper mold surface facing at least the innermost part of the recess is formed of a porous material having air permeability, and the porous material communicates with the outside of the mold. A die for press molding, characterized in that: