JPH0343203A - Slurry cast-molding method for molding with opening - Google Patents

Abstract

PURPOSE:To mold a molding having an opening readily and efficiently by attaching a flexible material to the opening forming part, and making the flexible material close-adhere to another molding mold or the flexible material which is attached to the other molding mold, and then supplying slurry therebetween. CONSTITUTION:An upper mold 1 and lower mold 2 attached with a flexible material 4 are mold-matched so as to be faced to each other via a molding space, wherein the flexible material is made to close-adhere to the lower mold 2. The flexible material 4 is expanded in its diameter such that the protrusion 4b is compressed in the axial direction through the elasticity. A slurry 3 is cast therebetween and the molding space is filled with a padding material 5, and then the upper mold 1 and lower mold 2 are separated from each other. Inasmuch as the flexible material 4 is released in its compressive force, the protrusion 4b is contracted in its diameter and restored to the original configuration, at that time, a gap 6 is formed between a padding 5 molded in the diameter expansion of the protrusion 4b and the protrusion 4b in the diameter contraction. For this reason, the flexible material 4 and padding 5 are separated automatically, thereby demolding the padding 5 readily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a slurry casting method for molded bodies with openings. This invention relates to an easy and efficient manufacturing method using a slurry casting method.

[Prior art] Slurry (a slurry made from powdered clay for molding) is injected into the molding space formed in the mold of a molding die consisting of an upper mold, a lower mold, etc., and unnecessary parts are removed in the slurry. A slurry casting method in which a liquid (e.g., water) is infiltrated into the mold, the remaining powdery clay is deposited on the inner surface of the mold, and then the mold is separated and the deposited material is taken out. is widely used today as a method for manufacturing various sanitary ware and the like.

Conventionally, this mud@casting method has been used to produce products such as the low tank 11 of flush toilets and the lid of the low tank shown in Fig. 3.
When manufacturing a molded body having an opening 12, for example,
As shown in FIG. 4, a slurry 15 was supplied to the molding space between the upper mold 13 and the lower mold 14 to form ink, and this ink-filled product was released from the mold to form a molded body without openings. Thereafter, the opening forming portion of this molded body is manually cut out by a worker to form an opening.

[Problems to be Solved by the Invention] The above conventional method requires: (1) After slurry casting, a complicated operation of cutting out the opening is required, resulting in a large number of man-hours and low manufacturing efficiency.

■ There is a risk of cracks or chips in the molded object during the cutting process, resulting in poor product yield.

■ Since the opening is done manually by the worker, there is a risk that the opening position may deviate from the predetermined position, making it difficult to form the opening with high precision.

■ Requires skilled workers.

There were drawbacks such as.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a slurry casting method for a molded body with openings, which enables easy and efficient production of a molded body with openings by the slurry casting method. .

[Means for Solving the Problems] In the slurry casting method of the present invention for molded bodies with openings, a first mold and a second mold are aligned so as to face each other through a molding space, and the molding process is carried out. In a method of forming a molded body with an opening by a slurry casting method in which a slurry is supplied to a space to fill the molding space with an inked material, the molds are separated from each other and the inked material is released. The method is characterized in that a soft material is attached to the part of the mold where the opening is to be formed, the soft material is brought into close contact with the other mold or the soft material attached to the other mold, and then the slurry is supplied.

[Function] The soft material attached to the part of the mold where the opening is to be formed fills the molding space in the part other than the soft material, so that the molded body with the opening formed in the soft material part is molded. be done.

The soft material expands in diameter due to its elasticity when brought into close contact with the other mold or the soft material, and contracts back to its original state when the contact force is released.

Therefore, by applying infill in the expanded diameter state and then returning it to its original state, a gap is formed between the inked object and the soft material, making it easy to separate the inked object and the soft material. It is considered possible.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a method of carrying out the slurry casting method for forming a molded body with openings according to the present invention, and FIGS. 2(a) to (C) are enlarged views of essential parts to explain the forming process. is an upper mold (i.e., a first mold) 1 and a lower mold (i.e., a second mold) 2
The molds are placed so that they face each other through the molding space, and the slurry 3 is supplied to the molding space to fill the molding space with the molded product (Fig. 2 (C)).
In the slurry casting method in which the molds are separated from each other after filling with 5) and the inked object is released, the soft material 4 for forming the opening is placed at a predetermined position on the bottom surface 1a of the upper mold 1, that is, on the molded body. It is attached to the area where the opening is to be formed and slurry casting is performed.

In this embodiment, the soft material 4 includes a wedge-shaped locking portion 4a,
The molded body is formed with a cylindrical protruding portion 4b, which is fitted and locked with the upper die 1 at the locking portion 4a, and an opening is formed in the molded product obtained at the protruding portion 4b.

For slurry casting, first, the upper mold 1 and the lower mold 2 to which the soft material 4 is attached are aligned so that they face each other across the molding space (Fig. 2(a)), and the soft material 4 is placed in the lower mold 2. Closely contact. At this time, the soft material 4 has elasticity as shown in Fig. 2 (
As shown in b), the protrusion 4b is compressed in the axial direction and expands in diameter. In this state, the slurry 3 is cast, and the molding space is filled with the ingot material 5.
After filling with the mold, the upper mold 1 and the lower mold 2 are separated. On this occasion,
Since the compressive force of the soft material 4 is released, the protruding part 4b returns to its original shape by reducing its diameter, but at this time, the ingot 5 formed when the protruding part 4b was expanded and A gap 6 is formed between the protrusion 4b and the protrusion 4b. Therefore, the soft material 4 and the fleshy material 5
and are automatically peeled off, making it possible to easily demold the flesh-applied material 5.

In the method of this embodiment, the protrusion 4b of the soft material 4 is in close contact with the lower mold 2, that is, in a state in which it is compressed in the axial direction and expanded in diameter, so that the thickness of the protrusion 4b of the soft material 4 is approximately equal to the thickness of the molded product to be manufactured. The height should be the same, and the outer diameter should be approximately the same as the inner diameter of the opening to be formed! ,: It is important to design.

The molded body manufactured by such slurry casting is
After performing appropriate post-processing such as polishing the openings, it is sent to the next process.

In such a slurry casting method of the present invention, when molding objects with different opening sizes, molded objects with different opening sizes can be easily manufactured by leaving the mold as is and simply replacing this soft material 4. can do. In this case, the soft material 4 can be replaced extremely easily. Further, even if the soft material 4 is worn out or damaged, it is extremely easy to replace the soft material 4.

In the present invention, the soft material attached to the first and/or second molds may have such elasticity that when a pressing force is applied to it, its cross-sectional area increases compared to when no pressing force is applied. There are no particular restrictions on the material, etc. Usually, as the soft material, an elastic material such as silicone rubber is used.

In addition, in the method shown in FIGS. 1 and 2, an example was shown in which such a soft material 4 is attached to the upper mold (i.e., the first mold) 1, but the soft material 4 is attached to the lower mold (i.e., the first mold) 1. , the second mold) 2. Alternatively, the soft material may be attached to both the upper mold 1 and the lower mold 2, and the soft materials attached to the upper mold and the lower mold may be brought into close contact with each other to supply the slurry.

The locking portion between the soft material and the first mold and/or the second mold prevents the soft material from coming off easily during molding, and when replacing the soft material, the elasticity of the soft material Any structure may be used as long as it can be easily released using the locking mechanism, and the locking structure is not limited to a wedge-shaped locking structure as shown in FIGS. 1 and 2. For example, if the soft material and the mold do not easily come apart due to friction on the joint surface,
It may be a cylindrical locking portion. Further, the soft material and the mold may be screwed together.

[Effects of the Invention] As detailed above, according to the slurry casting method of the present invention for molded bodies with openings, a molded body having openings can be easily and efficiently molded by slurry casting. For this reason, (1) there is no need for complicated cutting work, and the number of man-hours is reduced;

■ Eliminates the problem of molded objects being damaged due to cutting operations, improving product yield.

(2) An opening of a predetermined size can be formed in a predetermined position reliably and accurately.

As a result, production efficiency is significantly improved.

[Brief Description of the Drawings] Fig. 1 is a sectional view illustrating a slurry casting method according to an embodiment of the present invention, Fig. 2 is an enlarged view of essential parts showing the forming process, and Fig. 3 is a perspective view of a low tank. , FIG. 4 is a sectional view showing a conventional method. 1...upper mold, 2...lower mold, 3...sludge,
4... Soft material, 5... Fleshing material.

Claims (1)

[Claims] (1) Align the first mold and the second mold so that they face each other through the molding space, supply slurry to the molding space to fill the molding space with a material, and then alienate comrades,
In a method of molding a molded body with an opening by a slurry casting molding method in which an inked object is released from the mold, a soft material is attached to the part where the opening is to be formed in at least one mold, and the soft material is attached to the other mold or the other molding die. A slurry casting method for forming a molded article with openings, which is characterized in that the molded article is brought into close contact with a soft material attached to a mold, and then slurry is supplied.