JPH0116643B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides 40 to 50 kg of clay as a raw material for ceramics.
This invention relates to an improvement of a plaster mold for molding ceramics, which is press-fitted at a high pressure of around cm ² and uses the plaster mold as a kind of filtering medium to efficiently mold ceramics.

It has already been done to form a ceramic master form by forming plaster molds in close contact with each of a pair of metal supports and press-fitting plaster into a cavity formed by joining these plaster molds together. However, conventionally, slurry is injected with a pressure of about 10 kg/cm ² , and the drained water extracted from the slurry using a plaster mold as a filter is drained to the outside of the metal support. It used to be enough to simply drill countless minute drainage holes in the support, but a new type of gypsum with dramatically superior pressure resistance has been developed and is about to be commercialized in the near future. Since it has been proven that the pressure is 260 Kg/cm ² or more, it is judged that it is now possible to increase the mud pressure on the cavity to 50 to 60 Kg/cm ² or more. Increasing the press-fitting pressure in this way significantly improves molding efficiency, but at the same time increases the strength of pressure-resistant reinforcement by increasing the thickness of the metal support, which is essential to maintain the strength of the plaster mold. It is necessary to increase the drainage capacity, but not only does it take a considerable amount of man-hours to drill small-diameter drainage holes in a metal support without water, but it is also necessary to increase the drainage capacity. It is also necessary to increase the number of through-holes, making it more difficult to manufacture the metal support than in the past. The present invention departs from such conventional technical concepts and allows the metal support, which has conventionally had an integral structure, to be placed between adjacent side plates; between the side plate and the bottom plate; between the side plate and the opening flange, etc. The joint surface has slits, and the plaster mold is formed in close contact with a metal support, and a large number of drainage grooves opening into the slits are formed on the close contact surface. , its purpose is to form a plaster mold and, at the same time,
To provide a plaster mold for molding ceramics provided with a drainage groove suitable for plaster molds of various shapes.

An embodiment of the present invention will be described.

2 and 3 and 4 and 5 illustrate a pair of metal supports 1 and 11.

The metal support 1 has four side plates 2a, 2b, 2
c, 2d, a bottom plate 3, and a flange plate 4 superimposed on the upper edge of the side plates 2a to 2d, and an opening 5 is provided in the flange plate 4. Adjacent side panels 2
a, 2b, 2b, 2c, 2c, 2d, 2d, 2a
between each vertical edge of and each side plate 2a to 2d and bottom plate 3
A slit _S1 of about 3 mm width is formed between the back surface of the flange 4 and the outer surface of each side plate 2a to 2d.
A plurality of reinforcing plates 6a and 6b arranged at approximately regular intervals are fixed to the back surface of the bottom plate 3 to hold the slit _S1 . The group of reinforcing plates 6a is composed of plates formed into a substantially concave shape. In principle, the group of reinforcing plates 6b is also composed of substantially concave plates, but on the back side of the bottom plate 3, it is necessary to assemble the groups of reinforcing plates 6a and 6b in a lattice shape to increase withstand pressure. For this reason, the group of reinforcing plates 6b is made into small pieces cut at the portions that intersect with the reinforcing plates 6a in a lattice shape, and the edges of these small pieces in contact with the bottom plate 3 and the reinforcing plates 6a are joined by welding or the like. Further, a corner piece 7 as shown in FIG. 6 is passed between the lower ends of the corner reinforcing plates 6a and 6b, and the joint portion is fixed by welding or the like. Reference numeral 8 denotes a mud press-fitting pipe that penetrates the bottom plate 3 (or the side plates 2a to 2d) at appropriate locations and is fixed therein, and is provided at one or more locations.

The metal support 11 is inserted through the opening 5 of the flange 4 of the metal support 1 and is fitted so as to create a gap of 20 mm or slightly more between each inner surface of the side plates 2a to 2d and the bottom plate 3. It is composed of a box-shaped piece 12 and a flange 14 that is joined to the flange 4, and a large-diameter R-shaped curved surface is provided at the connection part between the side plate 12a and the bottom plate 12b formed by the box-shaped piece 12. 13 and a flange 14 and box-shaped piece 1 that are on the same level as the top surface of the top plate 12c.
A square slit S 2 with a width of about 3 mm is formed between S 2 and _2.
Reinforcing plates 15a and 15b arranged in a lattice shape are fixed to the top plate 12c and the flange 14 by welding or the like.

The metal supports 1 and 11 are made of steel plates, castings, etc. each having a thickness of about 10 mm, and have a structure that can withstand the high press-in pressure of mud.

Each adjacent side plate 2a, 2d of the metal support 1
and between the lower edges of each of the side panels 2a to 2 and the upper surface of the bottom plate 3 are linear opposed slits S1 _.
is configured. Therefore, prior to forming the plaster mold, as shown in FIG. 6, on the inner surface of each of the side panels 2a to 2d, a plurality of stages are arranged in parallel in the vertical direction and protruding from the slit _S1 , with a thickness of 2, Wire rods 21a and 21b such as metal wires and synthetic resin wires of about 3 mm
Similarly, the wire rods 21c were laid in parallel on the bottom plate 3 and protruded from the slit _S1 , and then a template (not shown) was covered, and the water mixing rate was determined by external multiplication.
32%, the apparent setting time is about 23 minutes, the setting completion time is about 43 minutes, and the wet compression temperature is about 300 kgf/cm ^2. After 2 to 3 minutes, the wire rods 21a, 21 are poured.
Take out b and 21c, let it solidify, remove the mold,
A plaster mold 22 shown in FIGS. 3 and 8 is formed. This plaster mold 22 is a female mold, and the upper edge is the side plate 2a.
It has a shape that matches the height of ~2d and does not protrude into the opening 5 of the flange 4, and the slurry press-fit pipe 8 is inserted into the appropriate place.
Open the inner end of. Metal support 1 of plaster mold 22
On the outer surface that is in close contact with the wire rods 21a to 21c, drain grooves 23 that open into the slits _S1 are formed at the drain marks of the wire rods 21a to 21c.

Flexible wire rods 31a and 31b are connected in parallel to the metal support 11, with their ends placed on the bottom plate 12b of the box-shaped piece 12, and extending from the curved surface 13 through the side plate 12a and protruding outward from the slit _S2 . , those wire rods 3
On the side plate 12a through which the wires 1a and 31b do not pass, the wire rods 31c protruding from the slits _S2 are arranged in parallel in the same manner as described above, and the wire rods 31c protruding from the slits S2 are joined. ~31
A male plaster mold 32 is formed by drawing out c and plaster setting as described above. This plaster mold 32 is inserted through the opening 5 of the flange 4 of the metal support 1 and joined to the plaster mold 22 as shown in FIG.
2 constitutes a freely open cavity 41, and a drainage groove 3 formed by pulling out the wire rods 31a to 31c is formed in the part that is in close contact with the metal support 11.
3 is composed.

Although the water drainage grooves 23 and 33 described above are formed using wire rods, other means,
For example, it can be formed by any appropriate means, such as laying a wire that dissolves in a solvent and dissolving and removing the wire after the plaster molds 22, 32 are completed.

The present invention has the configuration as exemplified above, and as shown in FIG. From tube 8, add 40 to 50 ounces of clay prepared as known as a ceramic raw material.
When press-fitted with a high pressure of about Kg/ ^cm2 , the plaster mold 22,
32 is a filter medium with high water permeability, and the press-in pressure is high, so the water contained in the slurry is absorbed into the plaster mold 2.
Due to the filtration action of 2 and 32, the water is pushed out to the outer surface that is in close contact with the metal components 1 and 11, and drains into the drainage grooves 23 and 23.
It passes through the slits S ₁ and S ₂ and is rapidly ejected to the outside, and the sieve that remains inside the cavity can form a ceramic mold of a predetermined shape. It is possible to form a prototype with significantly less moisture. The predetermined time will not be constant depending on the original condition of the cavity, but it will be 10Kg/cm ²
Approximately compared to the conventional method, which presses in mud with a pressure of
The molding time is reduced by about 50%, the moisture content is extremely low, and hard, unbreakable prototypes can be efficiently produced.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway plan view of the support 1, FIG. 2 is a cutaway side view of the same, and FIG. 3 is a cutaway side view showing the formation of a plaster mold 22. , FIG. 4 is a partially cutaway bottom plan view of the metal support 11, and FIG. 5 is a cutaway side view of the same, showing the plaster mold 32.
The formation of is also shown. FIG. 6 is a perspective view of a part of the metal support 1 showing the formation of the water drain groove 23, FIG. 7 is a partially cutaway perspective view of the metal support 11 showing the formation of the water drain groove 33, and FIG. The figure is a cutaway side view showing the joining of the plaster molds 22 and 32. 1 → Metal support, 2a to 2d → side plate, 3 → bottom plate, 4 → flange, S ₁ → slit, 6a, 6b →
Reinforcement plate, 11 → Metal support, 12 → Box-shaped piece, 12
a → side plate, 12b → bottom plate, 12c → top plate, 1
4 → flange, S ₂ → slit, 15a, 15b →
Reinforcement plate, 22 → plaster mold, 23 → drainage groove, 32 →
Plaster mold, 33 → drainage groove.

Claims (1)

[Claims] 1 A pair of metal supports with slits formed on each required joint surface, such as between adjacent side plates; between the side plate and the bottom plate; between the side plate and the flange; and formed in close contact with each of the metal supports. A plaster mold for molding ceramics into which plaster is press-fitted under high pressure, characterized in that a large number of drainage grooves opening into required slits are formed on the surface of the plaster mold that is in close contact with a metal support. .