JPH0525851Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to improvement of a mold for pressure casting.

(Prior art and its problems) Conventionally, when manufacturing sanitary ware such as toilet bowls and wash basins, pressure casting has been carried out.
In this pressure casting process, slurry is press-fitted into the molding space formed in the mold, allowing moisture to penetrate into the mold layer, and further releasing moisture to the outside through a porous tube embedded within the mold layer. The sucked slurry is deposited on the surface of the mold layer. Further, during demolding, water is forced onto the surface of the mold layer through a porous tube to form a water film on the surface of the mold layer.

In conventional pressure casting molds used for such pressure casting molding, for example, when aligning the upper mold and the lower mold, gaps may occur between the mating surfaces if they are not aligned accurately. There is a problem that sealing between the upper and lower molds cannot be ensured, and during pressure casting, slurry and water flow out from this area, making it impossible to perform good molding.Also, sand, etc. gets into the mating surfaces during alignment. Furthermore, there was a problem that the sealing performance deteriorated, and there were also problems such as damage to the molds if the upper and lower molds collided with each other during alignment.

(Means for Solving the Problems) The present invention was devised in view of the above-mentioned conventional problems, and provides a mold for pressure casting that ensures good sealing performance and also has buffering capacity. The purpose of this is to create a pressure casting mold in which split molds are joined together to form a molding space inside.
A concave groove surrounding the molding space is provided on the mating surface of the split mold, and an elastic body is mounted in the concave groove.

(Function) A groove is formed on the mating surface of the split mold, and an elastic body is installed in this groove, so that, for example, the upper mold can be aligned in abutment with the lower mold that makes up the split mold. When the molds are aligned, the elastic body absorbs the shock and acts as a buffer to prevent mold breakage, and when the molds are aligned, the elastic body is compressed into the groove to ensure good sealing of the mating surfaces. .

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional configuration diagram of a pressure casting mold, and the pressure casting mold 1 is composed of a split mold consisting of an upper mold 2 and a lower mold 3. When the mating surfaces K are brought into contact and aligned, a molding space S in which a wash basin can be molded is formed inside. The inner wall surface constituting the molding space S of each of the upper mold 2 and the lower mold 3 is a filtering material layer 4,
This filtering material layer 4 is made of porous synthetic resin, gypsum, or the like, and has continuous pores of about 10 mμ formed therein. Furthermore, the outside of the filter material layer 4 is a reinforcing layer 5,
This reinforcing layer 5 is made of non-porous synthetic resin or the like. Further, the outside thereof is a frame plate 6 formed of a steel plate or the like.

Further, a porous tube 8 is disposed inside the filter material layer 4 via a net 7. This porous tube 8 is disposed around the outer periphery of the molding space S, and when slurry is press-fitted into the molding space S from the outside and the water in the slurry permeates into the filtering material layer 4, Moisture can be sucked from the outside through this porous tube 8 and discharged to the outside through the porous tube 8. At the time of demolding, pressure is applied inside this porous tube 8 to expel the moisture. The water seeps out onto the surface of the molding space S, forming a water film on the inner wall surface of the filtering material layer 4, thereby facilitating demolding.

In this example, a concave groove Ha is formed on the lower mold 3 side or the upper mold 2 side of the mating surface K of the upper mold 2 and the lower mold 3.
Or Hb is formed, and this groove Ha or Hb
An elastic body 10 having a rectangular cross section as shown in FIG. 2 is attached to the body.

For example, as shown in Figure 2, the mating surface K on the lower mold 3 side
The concave groove Ha is formed in the filter material layer 4 in a concave shape, and is annularly provided on the mating surface K of the lower mold 3 so as to surround the outer periphery of the molding space S. It has a dish-shaped cross section with an open upper part. That is, in FIG.
An inclined surface _H2 is formed on the side surface of the bottom surface _H1 of the groove Ha, and the lower surface portion of the elastic body ₁₀ is adhered to the bottom surface H1 of the groove Ha using an adhesive or the like. still,
The elastic body 10 has a concave groove surrounding the outer periphery of the molding space S.
It is attached to the entire circumference of the Ha and is formed in a ring shape. The elastic body 10 is made of, for example, silicone rubber, and its thickness b is thicker than the depth a of the groove Ha, so that the elastic body 10 is moved by the upper mold when the upper mold 2 is aligned. When compressed, the side surface side of the elastic body 10 protrudes toward the inclined surface _H2 in the groove Ha, and the elastic body 10 fills the groove Ha.

Therefore, a concave groove is formed on the mating surface of the lower die 3 in this way.
If Ha and the elastic body 10 are provided, when aligning the upper mold 2 with the lower mold 3, the upper mold 2
Even when the lower die 3 collides with the lower die 3, the elastic body 10 acts as a cushioning material and can effectively prevent damage to the die. Further, when the lower mold 3 and the upper mold 2 are aligned, the elastic body 10 is crushed and fills the groove Ha, so that the mating surfaces K are almost flush with each other, and good sealing performance of the mating surfaces is ensured. In addition, in this example, since the elastic body 10 is attached in a pasted manner in the groove Ha, the elastic body 10 does not shift, and the lower mold 3
Good sealing performance is ensured when the upper die 2 and the upper mold 2 are aligned.

Note that the shape of the groove Ha and the cross-sectional shape of the elastic body 10 can be changed as appropriate, and may be formed into a round or square cross section.
Any material that can be compressed and filled inside is fine.

In addition, as mentioned above, the groove may be formed on the upper mold 2 side, and the groove formed on the upper mold 2 side may be
The elastic body 10 can also be installed inside the Hb.
Similarly, grooves Ha and Hb are formed simultaneously on the lower mold 3 side and the upper mold 2 side.
may be formed, and elastic bodies 10 may be installed in each of the grooves Ha and Hb, and the elastic bodies 10 on the upper die 2 and lower die 3 sides may be in contact with each other during alignment. However, the concave groove Ha on the lower mold 3 side
It is also possible to form the concave groove Hb on the upper mold 2 side at a position shifted from the molding space S, and to arrange the elastic bodies 10 in duplicate to ensure double sealing performance.

(Effect of the invention) The present invention provides a mold for pressure casting in which split molds are joined together to form a molding space inside, in which a concave groove surrounding the molding space is provided on the mating surface of the split molds, By installing an elastic body in the groove, the elastic body is compressed when aligning the split molds, buffering the collision force on the mating surfaces, effectively preventing damage to the mold, and making it possible to prevent the elastic body from aligning. At the same time, it is compressed into the concave groove to ensure good sealing on the mating surfaces of the mold.
This has the effect of improving the watertightness of the entire mold.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a pressure casting mold showing one embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part in a state where an elastic body is attached in a concave groove formed in the mating surface of the lower mold. 1: Pressure casting mold, 2: Upper mold, 3:
Lower mold, 4: filtration material layer, 5: reinforcing layer, 8: porous tube, 10: elastic body, K: mating surface, S: molding space, Ha, Hb: grooves.

Claims (1)

[Scope of utility model registration request] In a pressure casting mold formed by joining split molds to form a molding space inside, a concave groove surrounding the molding space is provided on the mating surface of the split molds, and an elastic body is installed in the concave groove. A leak-proof structure for a pressure casting mold, which is characterized by: