JPH01269505A - Cast molding method for closed-end molded product and molding cast mold - Google Patents

Abstract

PURPOSE:To prevent the inside of a mold from getting short of sludge generated by the dehydration of sludge by combining a gypsum mold with pores for feeding the sludge at the bottom of a molding section and a rubber inner mold with a sludge passage at the bottom of the molding section. CONSTITUTION:Sludge injected into a mold 3 and a preliminary chamber 22 through pores 12 forms a wall of alumina in the sludge of the pores 12 after the given time passes, and pores 12 are closed. A pipeline 5 connected with the pores 12 are removed after the pores 12 are closed, and a mold 3 is left as it is while the pipeline 5 is connected with another mold. The sludge in the mold 3 from which the pipeline 5 is removed gradually forms a wall and is dehydrated. The sludge running short in said process is fed from preliminary chambers 41 and 22 through a feeding passage 21. After the given time passed, the sludge in the mold 3 and the feeding flow passage 21 of the preliminary chamber 22 are dehydrated and solidified. Then, the sludge in the preliminary chambers 22 and 41 is discharged, and a molded material is prepared by removing an inner mold 2 and an outer mold 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fat filling method and a casting mold used in the casting method. In particular, the method of the present invention can be applied to casting molds of bottomed molded bodies including so-called bags.

(Prior Art) Ceramic molded bodies with complicated shapes are often molded by the die-casting method. In this casting method, the slurry is mixed with stone;
When injecting into Type 119, air bubbles enter the slurry and cause pinholes, so a pipeline method using gravity and pressure is used. In this pipeline method, the mud is supplied from the bottom of the stone mold 11 and is gradually poured into the stone 'Ff mold. In addition, in order to accurately form the outer and inner surfaces of a molded article by casting, an outer mold and an inner mold are required. At this time, if the outer and inner molds are made of plaster, cracks will occur inside the molded body, so it is customary to use a rubber mold for the negative side mold, usually the inner mold.

(Problems to be Solved by the Invention) By the way, when plaster is poured into the outer mold 71 and slurry is poured into the bottom molding part of the inner mold 72 using a rubber mold, as shown in FIG. Thickening is applied around the supply lower 4 at the bottom of the mold,
The slurry supply port had been closed. As a result, the slurry in the mold became insufficient due to dehydration. In order to solve this problem, it was necessary to make the supply port at least as thick as the molded body. However, when the supply port is made larger in this manner, the surface facing the supply port is made of rubber to which slurry is difficult to adhere, so that the supply port portion cannot be molded, resulting in defective molding.

(Means for Solving the Problems) An object of the present invention is to solve these conventional techniques in cast molding. Another object of the present invention is to improve the efficiency of manufacturing a molded article by casting.

The purpose of the present invention is to first place a rubber inner mold with a slurry passage in the bottom molding part on a plaster mold with a small hole for supplying slurry in the bottom molding part, and then pour the slurry through the small holes of the plaster mold. 1. Fill the gap between the plaster mold and the inner mold as well as the preliminary chamber in the inner mold with slurry, and when the small holes are blocked with slurry, stop supplying the slurry and separate the slurry supply means from the mold. In addition, the structure of the present invention, which is achieved by combining a plaster mold with small holes for supplying slurry in the bottom molding part and a rubber inner mold with a slurry passage in the bottom molding part, can be described more clearly. For example, the following is true.

a) A gypsum outer mold with small holes for supplying slurry in the bottom molding part is provided.

b) Prepare a rubber inner mold in which a slurry flow passage is provided in the molding part of Ii' and a preliminary chamber is formed inside.

C) Make a mold by arranging the inner mold on the outer mold, and press the mold with the bottom molding part facing downward.

d) Next, slurry is injected into the mold and into the preliminary chamber through the small hole for supplying slurry at the bottom of the outer mold.

e) When the slurry adheres to the small hole for supplying slurry at the bottom of the outer mold and the small hole closes, the supply of slurry is stopped and the supply means and the mold are separated.

f) When the slurry is insufficient due to the filling of the outer mold, the slurry in the preliminary chamber is supplied through the supply passage of the inner mold.

g) From then on, the mold is demolded to obtain a molded body, similar to the usual casting method.

In addition, in the present invention, the small holes in the outer mold are determined by the following formula depending on the capacity of the mold and the deposition rate of the slurry (fluidity of the slurry, dewaterability of the outer mold of plaster), but generally they are about 3 to 7 mm. be.

For example, when casting in a 5-minute cycle, D=5XT/2 D=diameter of small hole (amφ) T2 deposition speed (c-m/m1n) () The molding part refers to the part where the bottom of the molded body is molded using the outer mold and the inner mold. Further, the preliminary chamber may be provided inside or outside the inner mold, or both inside and outside, and is connected to the slurry flow passage in the bottom molding part of the inner mold.

(effect) According to the present invention, the above a), b), c) and.

As understood from section d), the slurry is injected from below the mold, and air bubbles do not enter the slurry.Moreover, as understood from section e), the small holes are formed by the ceramic raw material in the slurry. The slurry in the slurry supply pipeline does not flow with the slurry in the mold, and the pipeline can be cut off.

Furthermore, as understood from item f), the lack of slurry in the mold caused by the first inking is supplied from the preliminary chamber through the supply passage in the inner mold. As described above, the present invention does not have the problems encountered in the prior art.

(Example) The present invention will be explained in detail below based on the drawings.

FIG. 1 shows the mold and supply means such as pipelines used in the casting method of the present invention. Further, Fig. 2 is a process diagram showing the situation of pouring slurry into the mold and depositing the material. In Fig. 0, 1 is the outer mold made of plaster. This mold 1 has a diameter of 1
A hole 11 with a diameter of 1 cm and a depth of 16 cm and a small hole 12 provided at the center of the bottom of the hole 11 are opened. Moreover, the small hole 12 passes through the mold 1, and a pipeline 5 for supplying slurry can be connected to one end of the small hole 12. 2 is an inner mold made of rubber. This inner mold 2 has an outer diameter of 7 cm and a length of 14 cm.
It has a bottomed cylindrical shape with a wall thickness of 2 cm at the cylindrical portion and 2 cm at the bottom, and a slurry supply passage 21 with a diameter of 0.5 cm is opened at the bottom. Note that the cylindrical interior of the inner mold 2 is an internal preliminary chamber 22.
It becomes. These outer mold 1 and inner mold 2 are inserted into respective small holes 12. The mold 3 is made by assembling the supply passages 21 facing each other. The cylinder 4 on the mold 3 forms an external preliminary chamber 41 that is continuous with the internal preliminary chamber 22 of the inner mold 2 . Further, 5 is a pipeline, and one end of the pipeline 5 is connected to a slurry storage tank (not shown), and the other end is connected to a small hole 12 of the outer mold 1, respectively. Small hole 1 of mold 3 created in this way
2 facing downward and preparation of the casting device 6 completed.0 Next, casting using the casting device 6 will be described. First, adjust the slurry. The slurry is prepared by adjusting the alumina to the appropriate particle size distribution and adding defrosting agent and water. This slurry is sufficiently deaerated and stored in a slurry storage tank, and this mud wall is used during casting. The mud wall sent from the slurry storage tank through the pipeline 5 with compressed air passes through the small hole 12 and enters the mold 3.
It is gradually injected into the interior and the preliminary chamber 22, and further into the preliminary chamber 41.
is injected up to. (Fig. 2a) During this time, the mud wall is flowing at a constant flow rate due to pressurized air, and there is no infilling of the small holes 12. After a certain period of time (about 5 minutes) has passed after injection, the small hole 12
The alumina in the slurry is deposited inside and closes the small hole 12.

(FIG. 2b) After the small hole 12 is closed, the pipeline 5 connected to the small hole 12 is removed, the mold 3 is left as it is, and the pipeline 5 is connected to another mold. (Figure 2 C
) The slurry in the mold 3 from which the pipeline 5 has been removed gradually becomes thicker and dehydrates. During this process, the missing mud wall was removed from the spare room 4.
1 and 22 through the supply passage 21. (Second
Figure d) After about 2 hours, the slurry in the mold 3 and in the feed flow passage 21 of the preroll 1u chamber 22 is dehydrated and solidified. Here is the spare room 2
2. Remove mud from K"A in 41 and remove inner mold 2 and outer mold 1 to obtain a molded product. (Figure 2e) The molded product has pinholes and external shape defects. I couldn't.

(Effects of the Invention) In the present invention, since the slurry to be cast is injected from below the mold, air bubbles are not mixed into the slurry, and a molded article without pinholes can be obtained. In addition, in the present invention, since the inner mold is made of rubber that is difficult to adhere to, the ink buildup progresses from the outer mold surface, and there is no damage to the inside of the molded body unlike when ink buildup starts from both the inside and outside surfaces. There is only a small hole in the outer mold, and since this small hole is closed after a short time by filling, the small hole portion is also molded, and the shape of the molded product is not damaged at all.

Furthermore, in the casting method of the present invention, since the small holes are closed within a short fixed period of time, continuous casting is possible by connecting the molds during this fixed period of time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a casting device used in the method of the present invention, FIG. 2 is a process diagram of the method of the present invention, and FIG. 3 is a cross-sectional view of a conventional casting device. 1...Gypsum mold 2...Inner mold 6...Casting bag vL 12...Small hole 22...Preparation chamber

Claims (2)

[Claims] (1) A rubber inner mold with a slurry passageway in the bottom molding part is placed in a plaster mold with a small hole for slurry supply in the bottom, and the bottom molding part of the plaster mold is turned downward and the mold is opened from the small hole for slurry supply. supplying slurry;
Fill the space between the plaster mold and the inner mold as well as the preliminary chamber within the inner mold with slurry,
A method for casting a molded body with a bottom, characterized in that the supply of slurry is stopped when the small hole is clogged with slurry, and the slurry supply means and the mold are separated. (2) A casting mold for forming a bottomed body consisting of a plaster mold with a small hole for supplying slurry in the bottom molding part and a rubber inner mold with a slurry passage in the bottom molding part.