JPS60219008A - Mold for pressure molding - 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 relates to a mold for pressure molding porcelain, etc., and more specifically, it is mainly used when dry pressure molding porcelain tiles such as those specified in the Japanese Industrial Standards (JISA5209). Regarding the mold used, the mold is located at the bottom of a vertically movable frame body, and the pressure molding mold presses the powder introduced from above into the space formed by the frame body and the mold by an upper press mechanism. In this case, the structure of the mold is made of a material with appropriate elasticity, which prevents the powder raw material from sticking to the mold surface and improves the formability of the molded product. This invention relates to a mold that can mold tiles with high dimensional stability over a long period of time.

BACKGROUND ART Conventionally, it has been widely practiced to construct, for example, floors, external walls, and internal walls of kitchens, bathrooms, etc. using ceramics commonly known as tiles.

Among them, porcelain tiles with an impermeable base, 0% water absorption, and less than 1% solubility are most commonly used. The method of final firing is often used, and the pressure molding method is the most important item in producing high-quality, inexpensive tiles, and various studies have been conducted in the past. One problem that was difficult to solve was the releasability when removing the molded product from the mold. That is, as shown in FIG. 11, the mold B is positioned at the bottom of the space of the vertically movable frame A, and is held by a lower press C using an elastic mechanism such as an arbitrary coil spring (not shown). An upper press E is located above, which can be lowered and pressurized by a suitable press mechanism, etc., and the space formed by the mold B and frame A having such a structure is used to press, for example, porcelain. After putting in the powder consisting of powder, etc., the upper press E
When pressurized by generates an upward pressure, so that the powder is evenly pressed from above and below. After holding this state for a predetermined period of time, the pressure of the upper press E is released and the frame A is If the article is lowered using a known structure, the article formed under pressure will be located above the upper surface of the frame A, and in this state, the article can be pressed laterally using a known slide mechanism. The product is then released from the mold and transferred to the next step, thus completing one pressure molding cycle.

However, during the process, even the dried powder contains some moisture, and when pressurized, this moisture turns into water vapor and adheres to the mold surface, staining the surface of the molded product. Also, the heat generated by the heater installed to evaporate the water vapor during pressure molding may cause the powder to burn onto the mold surface, resulting in molding in the next step (G in Figure 1ii). The surface of the product was soiled.

Therefore, the reality is that the mold surface is usually wiped clean with a cloth after each process, but in mechanized pressure molding, the time required to wipe the mold surface is longer than the pressurization time. I was very confused because it ended up costing me a lot of money.

Therefore, hard chrome plating or a thin coating of 7T resin has been applied to the surface of the mold, but even with these methods, repeated pressurization with strong pressure will cause damage. However, the plating layer or coating layer peeled off, or the surface became rough and satiny due to the action of powder sand, making it impossible to create a mold that could withstand long-term use.

In order to deal with such a situation, the reality is that the surface of the mold is polished to a mirror finish with a great deal of effort, but the details cannot be polished by machine and must be done by hand. One drawback was that it was difficult to deliver large quantities of molds in a short period of time, and the cost of the molds naturally increased.

Therefore, there has been a strong desire among molders and mold manufacturers for a mold that can be produced at low cost, without powder sticking, and which can automatically perform pressure molding.

The present invention has been developed in view of such circumstances and as a result of repeated research day and night in order to satisfy the conventional demands.One embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention, FIG. 1 is a structural perspective view of a mold according to the present invention, and FIG. 2 is a main part of the mold assembled in use. The structure diagram and FIG. 3 are explanatory diagrams of the same usage state, and are made of synthetic resin such as polypropylene resin, polyacetal resin, 7 resin, urethane resin, or polybutylene resin (PBT). After machining the mold bottom part, mounting holes, etc. on the mold material using various machine tools, the completed lower mold 10 is finished by polishing and the like, as shown in Fig. 2, using a lower press. An upper press 24 is fixed to the upper press 21 by bolts (not shown) or the like, and is positioned at the bottom of the space 23 of the vertically movable frame 22, and has a retaining mold 30 made of tool steel or the like similar to the conventional one attached above.
As shown in FIG. 3, a space 23 formed by the inner wall 22A of the frame and the lower mold 10 (see FIG. A predetermined amount of dry powder P of porcelain or the like is put in, and then an appropriate press mechanism is operated to lower the upper press 24,
When the powder P is pressurized, the lower press 21 descends via the powder P due to the pressurizing force, and an appropriate elasticity 8! such as a coil spring (not shown) is applied. The mechanism generates an upward pressure as a reaction to the pressure of the upper press 24, and therefore applies pressure to the lower die 10 and the upper die 30 from above and below, thereby uniformly pressurizing the powder P. After a predetermined period of time has elapsed in this state, the pressurizing force is released and the frame body 22 is lowered by an appropriate mechanism, and then the well-known conventional slide mechanism 26 is operated to lower the upper surface of the frame body 22. The molded product 50 located above is pressed and transferred to the next step.

At this time, the pressure-molded molded product 50 is easily released from the lower mold 10, which is made of a flexible and easily releasable synthetic resin, due to its elastic force and small frictional force. Since there is no need for a heating heater, the powder may be baked into the lower mold 10 and damaged externally when pressed by the swig 26, or the remaining powder may be baked onto the mold surface and have an adverse effect on the next pressure-molded product. Moreover, since the mold release property is so good that powder does not remain on the mold surface and a clean mold surface can be maintained, the work process of wiping the mold surface with a cloth etc. every time the pressure is applied is 6. Also, molds can be eliminated and labor can be significantly reduced! i! Even for dead bodies, it is possible to easily process mold materials with excellent workability that are molded into appropriate shapes, so processing time can be significantly shortened, and finishing work such as polishing can also be done. Since it is easy to manufacture, it is possible to manufacture and deliver good molds in a short period of time.

Furthermore, in the mold according to the present invention, not only the lower mold but also the upper mold may be made of the same material.
As in the embodiment, the mold surface layer member 12 made of synthetic resin as described above may be fixed to the surface of the auxiliary member 11 made of metal, and such a structure may be similar to the embodiment described above. In addition, when replacing a mold that has worn out due to repeated use, only the mold surface layer member 12 needs to be replaced, and the mold can be provided at a lower cost. Next, a third embodiment of the present invention will be described.As shown in Fig. 5, foam-molded styrene resin or the like is compressed to a strong state with a desired elastic force.For example, - If the mold of this embodiment is made by applying pressure with a press device attached to a male mold, the same mold can be easily produced in large quantities, and the mold manufactured in this way can be used. When press-molding, for example, porcelain products such as tiles, the same effects as in the embodiments described above can be achieved.

Next, referring to FIG. 6, a fourth embodiment of the present invention will be described. It is manufactured by kneading fibrous material such as paper or cloth with an appropriate baking material and molding it. The same effects as in the embodiment described above can be obtained.

Further, as shown in the fifth embodiment of the present invention shown in FIG. 7, it may be manufactured from ceramic material, or as shown in FIG. 8, it may be molded from impact-resistant glass I.

Further, as shown in Fig. 9, cemented carbide powder may be contained in the synthetic resin, or fibers, glass, etc. as shown in the above embodiments may be kneaded to provide even better material properties. It is possible to construct other embodiments such as the embodiment shown in FIG. 4.

In addition, as shown in FIG.
In order to avoid wear due to contact with the lower mold 10, a hardened guide plate 15 may be placed under the lower mold 10, and the guide plate 15 may slide and guide the inner surface of the frame. .

As described above, the present invention places a mold at the bottom of a vertically movable frame body, and applies pressure from above to the powder charged into the space formed by the frame body and the mold by an upper press mechanism. In molding molds, the structure of the mold is made of a material that has appropriate elasticity, so that the powder does not stick to the mold surface and is difficult to release, or the remaining powder This eliminates the possibility of adversely affecting the next product to be pressure molded, making it unnecessary to wipe the surface of the mold, making it extremely convenient. It has good workability and allows for easy finishing work.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be applied in various ways, such as by changing the ingredients and materials to be kneaded depending on the location, or by using a molding machine without a lower press. The invention may be modified and implemented without departing from the gist of the invention.

As described above, the present invention can provide a very economical mold that is easy to use and easy to manufacture.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, FIG. 1 is a perspective view of the main part of the present invention, FIG. 2 is a schematic structural diagram of the present invention incorporated in the same usage state, FIG. 3 is an explanatory diagram of the same usage state, and FIG. 4 Fig. 5 is a structural diagram of the second embodiment of the present invention, Fig. 5 is a structural diagram of the third embodiment of the present invention, Fig. 6 is a structural diagram of the fourth embodiment of the present invention, and Fig. 7 is a structural diagram of the fifth embodiment of the present invention. 8 is a structural diagram of still another embodiment of the present invention, FIG. 9 is a structural diagram of still another embodiment of the present invention, and FIG. 10 is a structural diagram of still another embodiment of the present invention. Figure 11 is a structural diagram of the conventional product. In the figure, 10 is a lower mold, 21 is a lower press, 22 is a frame, 23 is a space, 24 is an upper press, 30 is an upper mold, and 50 is an article. Patent applicant Yoshi Ando Doando-Fumi 1M No. 20 No. 30 No. 10

Claims (1)

[Scope of Claims] 1. For pressure molding, in which a mold is located at the bottom of a vertically movable frame body, and powder introduced from above is pressed by an upper press mechanism into a space formed by the frame body and the mold. The mold is a pressure molding mold made of a material with appropriate elasticity. 2. Claim 1, characterized in that the mold is made of a polymeric material such as synthetic resin or rubber.
Pressure molding mold as described in section. 3. The pressure molding mold according to claim 1, wherein the mold is manufactured by pressure molding a foamable material. 4. The pressure molding mold according to claim 1, wherein the mold is made of a material kneaded with fibrous material. 5. The pressure molding mold according to claim 1, wherein the mold is made of ceramic. 6. The pressure molding mold according to claim 1, wherein the mold is made of glass.