JP2747186B2 - Casting mold and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting mold in which a slurry containing a raw material of a ceramic product is supplied into a water-permeable mold to perform casting , and a method of manufacturing the casting mold .

[0002]

2. Description of the Related Art Conventionally, for molding ceramic products, there has been known a molding method using a casting mold.
As shown in FIG. 10, the casting mold has a pair of upper and lower molds 2 and 3 having water permeability and a molding cavity 1 formed therein. Is formed.

When a ceramic product is cast-molded, the slurry is caused to flow into the cavity 1 from the casting port 4 and then the slurry is fed by applying pressure while the mold 2 and the mold 3 are formed in the cavity 1. Vacuum to dewater the slurry. As a result, the raw material base 5 in the slurry is formed as shown in FIGS.
As shown in the order of FIG. 1 and FIG. 12, the material is deposited while being sequentially deposited from the inner surface portion of the cavity 1, and is filled into the cavity 1. Thereafter, the mold is opened while air blowing, and the molded product K is released.

[0004]

However, in the case of the prior art described above, when the raw material base material 5 is sequentially deposited from the inner surface of the cavity 1 and molded as a molded product K, as shown in FIG. Holes 7 are formed inside the
Was formed, which was the cause of defective molding.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to form a molded article from a slurry without voids inside the molded article. Casting molds and molds that can be molded without
And a method for producing the same.

[0006]

In order to achieve the above object, a casting mold according to the present invention comprises a casting mold having a water-permeable mold, which is cast through a casting supply passage provided in the mold. A mold is supplied from a mouth, and a molded product is cast-molded by dewatering through the mold. In the cavity of the cavity, a peripheral portion of the casting port is provided with a water-impermeable material or the molding. Providing a seal portion made of a material having low water permeability than the mold,
The seal is provided near the maximum thickness portion in the cavity.
The diameter dimension of the part is at least approximately 0.
The feature is that it is set in a range up to 9 times .

[0007] The opening diameter of the casting port is at most large.
It is preferable that the thickness be set within a range up to approximately twice the maximum thickness dimension of the cavity .

On the other hand, when a seal portion is not provided around the casting port, the casting port is provided near the maximum thickness portion of the cavity, and the opening diameter of the casting port is adjusted to the maximum wall thickness. What is necessary is just to set it in the range of about 0.9 to 2 times the thickness dimension.

[0009] Further , a pipe forming a pouring supply path,
The entrance part and the surrounding seal part are integrated and
When manufacturing a casting mold in which a casting hole forming part larger than the outer diameter of the pipe is embedded and fixed, a step of forming a through hole for inserting the pipe at the same time as forming the forming die; A step of embedding the casting hole forming part at the same time as forming the mold, or fitting the casting hole forming part into a recess formed by post-processing by a drill or the like or molding by a mold; and And screwing a threaded portion formed at one end of the pipe to the casting port forming part from outside the molding die and connecting the threaded portion, and a threaded portion formed at the other end of the pipe. Outside this pipe
By screwing a joint having a diameter larger than the outside of the molding die, a step of fixing the three components of the casting port forming part, the pipe, and the joint to the molding die in a retaining state may be performed.

[0010]

The present invention has been made by focusing on the following points. That is, when investigating the cause of the occurrence of voids and streaks, when the slurry was supplied into the cavity and dewatered, the raw material was successively deposited on the inner peripheral edge of the casting port, and the inside of the cavity was the raw material. Before filling, the casting port was closed with the raw material base, and voids and stripes were formed inside the molded product. From this, the present inventor presumed that if the deposition of the raw material base material on the inner peripheral edge of the casting port is delayed, voids and streaks will not be formed, and as one means for achieving this, molding A seal portion made of a water-impermeable material or a material having a lower water permeability than the molding die is provided on the inner surface of the mold cavity around the casting port.

By this seal portion, the dewatering action in the peripheral portion of the pouring port is suppressed, and the deposition of the raw material base in the peripheral portion of the pouring port is delayed as compared with other portions, so that the inside of the cavity is the raw material substrate without gaps. Until it is filled, the pouring opening will not be closed by the raw material base.

In this case, by setting the position of the casting port near the maximum thickness portion of the cavity, the slurry can easily flow around the corners of the cavity. In addition, direct of the seal portion
By setting the diameter in a range of at least about 0.9 times the maximum thickness, the deposition rate of the raw material base material on the periphery of the casting port can be sufficiently reduced. Here, the maximum thickness dimension is defined as the diameter of an inscribed circle inscribed in the cavity.

[0013] Further, the opening diameter of the casting port is set to a maximum at a maximum.
If the thickness is set within approximately twice the wall thickness, the casting hole trace on the surface of the molded product will fit within one convex or concave surface of the molded product, making it easy to finish the casting hole trace by post-processing. is there.

On the other hand, when the seal portion is not provided around the casting port, the casting port is provided near the maximum thickness portion of the cavity, and the opening diameter of the casting port is set to:
If it is set in the range of approximately 0.9 to 2 times the maximum thickness dimension, when the raw material substrate is deposited on the inner surface of the cavity, before the casting port is closed with the raw material substrate, the raw material substrate is closed. Will fill the cavity without any gaps, and voids and streaks will not be formed inside the molded product.

Here, if the opening diameter of the casting opening is excessively large, the finish of the casting opening trace on the surface of the molded product must be performed in a wide range when finishing by post-processing. Become. Further, when the opening diameter is excessively large, the dewatering area in the cavity is substantially reduced, and the molding takes time.

In this regard, since the upper limit value of the opening diameter of the casting port is set to approximately twice the maximum thickness, the finish processing range for the molded product does not become excessively large, and the finish processing by post-processing is not required. It becomes simple, the reduction of the dewatering area is appropriately suppressed, and the molding time does not become long.

[0017] Further, a pipe forming a pouring supply passage is provided.
The entrance part and the surrounding seal part are integrated and
When manufacturing a casting mold in which a casting port forming part larger than the outer diameter of the pipe is embedded and fixed, a through hole for inserting the pipe is formed at the same time as the forming of the forming mold, and At the same time as molding, bury the casting hole forming part,
Alternatively, the casting hole forming part is fitted into a recess formed by post-processing with a drill or the like or molding by a mold, and the pipe is inserted into the through-hole, and a threaded portion formed at one end of the pipe is cast. The above-mentioned molding to the entrance forming part
If a joint larger than the outside diameter of the pipe is screwed from the outside of the molding die to a threaded portion formed at the other end of the pipe , the casting hole forming part, The three members of the pipe and the joint are firmly fixed to the molding die in a retaining state, and a casting mold having excellent durability is completed. The casting hole forming part, the pie
Even if the mold external connection work of tripartite flop及 beauty the joint
It is easy to do.

[0018]

[Example] First, with reference to Figure 1 of the per Examples 1 to 4 embodying the third aspect of the present invention. First, in FIG. 1, the upper mold 11 and the lower mold 12
The upper and lower dies 11 and 12 have a molding cavity 13 formed therein, which is made of a material having water permeability such as ceraplast (trade name) and gypsum. Upper mold 1
1, a metal cylindrical body 15 constituting a casting supply path 15a is fixed therethrough, and a cavity 13 of the casting supply path 15a is formed.
The opening on the side is a casting port 14. The slurry supply system piping is connected to the upper end (the end outside the mold) of the cylindrical body 15.

Now, in this embodiment, the thickness of the molded product is uniform and each portion is the maximum thickness portion.
No matter where the casting port 14 is formed, the cavity 13
In this embodiment, the casting port 1 is
4 is formed at the center of the upper die 11. The opening diameter Dd of the casting hole 14 is set to be in a range of about 0.9 to 2 times the maximum thickness Dh of the cavity 13 for a reason described later.

The upper and lower dies 11, 12 are provided with a cavity 1
A mechanism for evacuating or blowing air through the walls of the upper and lower dies 11, 12 is provided in the interior of the apparatus 3, and the piping of the mechanism is indicated by reference numerals 16a, 16b.

In the above configuration, a case where a molded article is formed from slurry will be described. The composition of this slurry is, for example, 15 to 35% of feldspathic raw material and 10 to 30 of quartz material.
%, An alumina material of 5 to 30%, and a clay material of 5 to 40%, which contain 30 to 40% of water.

First, the slurry is introduced into the cavity 13 from the casting port 14 at a pressure of 20 to 50 kg / cm ² .
A vacuum is drawn through 12 to dewater the slurry. As a result, as shown in FIG. 2, FIG. 3, and FIG. 4, the raw material base 17 in the slurry is sequentially deposited from the inner surface portion of the cavity 13 and is filled and molded into the cavity 13, and the molded product K is cast. Molded. This casting operation is continued until the entire casting hole 14 is finally filled with the raw material in the slurry and the raw material is solidified. Thereafter, the mold is opened while air blowing and the molded product K is separated. Type.

At the time of the above-mentioned forming, the raw material base material 17 is successively deposited also on the opening edge of the casting port 14, but according to this embodiment, the opening diameter Dd of the casting port 14 is Is set within a range of about 0.9 to 2 times the maximum thickness dimension Dh in FIG. 3, the raw material 17 is closed before the raw material base 17 closes the casting port 14 as shown in FIGS. The substrate 17 completely fills the cavity 13 without any gap. As a result, no voids and streaks remain in the molded product K as in the related art.

Here, if the opening diameter of the casting port 14 is excessively large, when the casting port trace in the molded product K is finished by post-processing, this must be performed in a wide range. This is troublesome, and the dewatering area in the cavity 13 is also substantially reduced, so that the molding takes time.

In this regard, according to the present embodiment, the upper limit value of the opening diameter Dd of the casting port 14 is set to approximately twice the maximum thickness Dh as described above. And the finishing process is simplified, and the reduction of dewatering area is also moderately suppressed.
The molding time is not long.

Incidentally, according to the results of experiments conducted by the present inventor while changing the ratio of Dd / Dh, the following Table 1 was considered.

[0027]

[Table 1]

As can be understood from Table 1, Dd / D
h is “2.0”, “1.25”, “1.0”, “0.
In the case of 9 ", no voids and streaks are observed in the molded product, and the finishing time of the post-processing is not too long. On the other hand, when Dd / Dh is “2.
In the case of No. 5 ", although the formation of voids and streaks was not recognized in the molded product, the finishing time was considerably long. When Dd / Dh is “0.83”, the finish processing time is short, but 5 to 10
A hole was recognized at the point where mm was entered. Also, it can be seen that the molding time becomes longer as Dd / Dh becomes larger.
Therefore, the overall evaluation is that Dd / Dh is from “2.0” to “0.
"No. 9" is "good", and other than "no".

On the other hand, FIG. 5 shows a second embodiment embodying the claims 1 and 2 of the present invention. Also in this embodiment, as in the first embodiment, the inside of the cylindrical body 45 penetrated and fixed to the center of the upper die 11 is used as a casting supply path 45a, and the opening of the casting supply path 45a on the cavity 13 side. Are casting holes 22. Further, for example, a circular seal portion 21 made of a non-water-permeable material or a material having a water-permeability equal to or lower than the water-permeability of the upper and lower dies 11 and 12 is provided in the inner surface of the cavity 13 around the casting port 22. In addition, the outer diameter Ds of the seal portion 21 is set within a range of at least approximately 0.9 times the maximum thickness Dh of the cavity 13. Further, in this embodiment, in order to shorten the molding time, the upper limit of the outer diameter Ds of the seal portion 21 is set to be approximately twice the maximum thickness Dh. The seal portion 21 is made of, for example, plastic such as Teflon, and it can be said that the water permeability is almost nil in this case. In addition, casting port 2
The position 2 is the maximum thickness portion in the cavity 13 as in the first embodiment described above.

In this embodiment, when the raw material body of the slurry is deposited on the inner surface of the cavity 13, the seal portion 21 exists around the casting port 22 on the inner surface of the cavity 13. The dewatering of the green body and, consequently, the degree of ingrowth of the raw green body is suppressed as compared with the other parts, so that the raw green body is completely filled in the cavity 13 before the casting opening 22 is closed by the raw green body. become. Therefore, the casting operation is continued until the entire casting hole 22 is finally filled with the raw material in the slurry and the raw material is solidified, and then the mold is opened while air blowing to separate the molded product. By molding, no voids or streaks remain in the molded product.

Here, the sealing portion 21 is
Since the inner surface is formed, the molded product does not require finishing treatment or is extremely simple even if required. Also,
Since the upper limit value of the diameter dimension of the seal portion 21 is almost twice the maximum thickness dimension Dh as described above, the reduction of the dewatering area can be appropriately suppressed, and the molding time can be shortened.

In particular, in this embodiment, the sealing portion 2
Since the size of the outer edge of 1 may be the size described above, the size of the inner edge, in other words, the opening diameter of the casting port 22 itself is the same size as before, and, of course, may be appropriately changed. Needless to say, this is also possible.

Incidentally, according to an experiment conducted by the present inventors while changing the ratio of Ds / Dh, the following Table 2 was considered.

[0034]

[Table 2]

As can be understood from Table 2, Ds / D
h is “2.0”, “1.25”, “1.0”, “0.
In the case of "9", no voids and streaks are observed in the molded product, and the number of finishing steps in post-processing is not large. On the other hand, when Ds / Dh is “2.5”, no voids and streaks are observed in the molded product, and the finishing time of the post-processing is short, but the dewatering area is reduced. become longer. When Ds / Dh is “0.83”, the finishing time is short, but 5 to 10
A hole was recognized at the point where mm was entered. Therefore, the comprehensive evaluation is “good” when Ds / Dh is in the range of “2.0” to “0.9”, and is “not good” otherwise.

By the way, in the second embodiment,
Since the pouring port 22 is located near the maximum thickness portion of the cavity 13, the slurry easily flows to every corner of the cavity 13 .

In the second embodiment, the seal portion 21 is made of plastic having almost no water permeability. However, any material having a lower water permeability than the upper and lower dies 11, 12 may be used. Part of the casting port 22
In the part, the degree of ingrowth of the raw material
3) The intended purpose can be achieved because it is behind the other parts.

FIG. 6 shows a third embodiment of the present invention, similar to the first embodiment, in which the structure of claim 3 is embodied. Entrance 3
1 is different from the first embodiment. That is, the casting port 3
1 is formed in a shape in which the front end side is expanded in a tapered shape. However, the opening diameter Dd of the casting hole 31 of the second embodiment is also set within a range of about 0.9 to 2 times the maximum thickness Dh of the cavity 13, and the first embodiment is different from the first embodiment. It has the same effect as.

On the other hand, FIG. 7 shows, as a fourth embodiment, a case where the shapes of the cavities 43 in the upper and lower dies 41 and 42 are different, and the thickness of the cavities 43 is different. In such a case, the casting port 44 may be formed near the maximum thickness portion, and the maximum thickness dimension Dh refers to the diameter of an inscribed circle inscribed in the cavity 43 .

By the way, in the case of the second embodiment described above,
As shown in FIG. 9, it is also conceivable that a liquid silicone resin or an acrylic resin is applied to the peripheral portion of the casting port 64 or a sheet wax is adhered as the seal portion 65.

However, as described above, the sealing portion 65
In the configuration formed by coating or sticking, the strength of the seal portion 65 is inherently weak, and the seal portion 65 is easily peeled off from the lower mold 67 when releasing the mold while air blowing after casting. For this reason, the life of the seal portion 65 is short, and
The replacement work takes time and reduces production efficiency. By the way, according to the test results of the present inventor, when the sheet wax is attached, the life is only once, and the sheet wax needs to be replaced every time, and the replacement work takes about 10 minutes. I will. In addition, the life of one coated with a liquid silicone resin or acrylic resin is one.
This is about 0 times, and the repair work takes about 60 minutes.

Therefore, the present inventor has devised a configuration shown in FIG. 8 as a fifth embodiment of the present invention in order to greatly improve the durability of the seal around the casting port. This embodiment is obtained by applying a casting mold of the suspension insulator according to claim 4,
It embodies the invention of the above. This casting mold 50
Is composed of a pair of upper and lower molding dies 51, 52 formed of a water-permeable material such as ceraplast (trade name) or gypsum. A cavity 53 for molding a suspension insulator is provided in both of the combined molding dies 51, 52. Is formed.
A casting port forming component 56 integrally formed with a casting port 54 and a sealing portion 55 around the casting port 54 is embedded and fixed in the lower die 52 upward. The casting port forming part 56 is formed integrally with, for example, a fluororesin (trade name “Teflon”) so that the casting port 54 and the sealing portion 55 have non-permeable, non-adhesive, and water-repellent properties. I have.

The sealing portion 55 of the casting port forming part 56
Are exposed inside the cavity 53 so as to constitute a part of the inner surface of the cavity 53. In this case, the sealing portion 55
Is set to a size approximately 0.9 to 2 times the maximum thickness of the cavity 53 (molded product) (the reason will be described later). Here, the maximum thickness dimension of the cavity 53 is defined as the diameter of an inscribed circle inscribed in the cavity 53. In addition, the opening diameter of the casting port 54 may be large.
It is set in a range up to almost twice the maximum thickness dimension of the cavity 53 .

On the other hand, the lower end of the casting hole forming part 56 reaches the center of the thickness of the lower mold 52, and a female screw 57 is formed on the inner peripheral portion of the lower end of the casting hole 54. Correspondingly, a metal pipe 59 constituting the casting supply path 61 is inserted from the outside of the lower mold 52 into a through hole 58 formed in the lower mold 52, and is formed on the outer periphery of the upper end of the pipe 59. The formed male screw portion is tightened into the female screw 57 at the lower end of the casting opening 54 from the outside of the lower mold 52 . The casting port forming part 56 and the following description
Bevel joint 60 is larger than the outer diameter of pipe 59
No. The thread formed at the lower end of the pipe 59 has
A joint 60 for connecting a slurry supply device (not shown)
The lower mold 52 is screwed from outside .

The method of manufacturing the lower mold 52 having such a structure is as follows.
A casting port forming part 56 is fixed to a mold (not shown) for molding the lower mold 52, and the mold is filled with a raw material and molded to form the casting port forming part 56 into a molded product (lower mold). At the same time, the through hole 58 is formed while being embedded in and fixed to 52). And
After this molding, a pipe 59 is inserted into the through hole 58, and the upper end screw portion of the pipe 59 is screwed into the female screw 5 at the lower end of the casting port 54.
7, and a joint 60 is screwed to the lower end thread portion of the pipe 59. By screwing the joint 60, the casting port forming part 56, the pipe 59, and the joint 60 are firmly fixed to the lower mold 52 in a retaining state, and the casting mold 50 with excellent durability is completed. This
In the case of the casting port forming part 56 and the joint 60
Since the casting port forming part 56 is larger than the
The joint 60 is cast-in.
The mouth forming part 56 prevents the cap from coming off. Moreover, casting
Pipe 29 and joint 6 for inlet forming part 56
0 is connected from the outside of the lower mold 52, so that the manufacturing workability is good.
No.

In this case, the casting port forming part 56 is embedded and fixed in the lower mold 52 at the same time when the lower mold 52 is formed.
As another mounting method of the casting hole forming part 56, a recess for fitting the casting hole forming part 56 is formed in the lower die 52 by post-processing with a drill or the like or molding by a mold, and the casting is formed in this recess. The inlet forming part 56 may be fitted.

When casting is performed using the casting mold 50 described above, the slurry is dewatered by vacuuming through both the molds 51 and 52 while pouring the slurry into the cavity 53 from the casting port 54. By this dehydration action, the raw materials in the slurry are sequentially deposited on the inner surface of the cavity 53 and cast.
This casting operation is continued until the entire casting opening 54 is finally filled with the raw material material in the slurry. At this time, since the peripheral portion of the casting port 54 is covered with the non-water-permeable seal portion 55, the sealing portion 55 suppresses the dehydration action in the peripheral portion of the casting port 54, and In the peripheral portion, the deposition of the raw material is delayed more than in other portions. For this reason, the casting opening 54 can be smoothly carried out to the end without the casting port 54 being blocked by the deposited layer of the raw material immediately before the end of the casting, and the cavity 53 is completely filled with the deposited layer of the raw material. When exhausted, voids and streaks cannot be formed inside the molded article, and molding defects do not occur.

After the casting, the mold is released while blowing air into the cavity 53 through both the molds 51 and 52. In this case, the casting port forming part 56 embedded and fixed in the lower mold 52.
Since the seal portion 55 is integrally formed, the seal portion 55 is hardly peeled off (in other words, the releasability is improved), and the life of the seal portion 55 can be greatly extended. Incidentally, according to the test results of the inventor, it has been confirmed that the casting can be performed 300 times or more with one seal portion 55. As described above, if the life of the seal portion 55 is prolonged, frequent replacement and repair work of the seal portion 55 is not required, and the production efficiency can be improved accordingly.

In addition, in this embodiment, since the casting port forming component 56 (seal portion 55) is formed of fluororesin, the non-adhesive and water-repellent properties of the fluororesin surface cause the seal portion 55 to be removed. There is an advantage that the molded article is easily peeled off and the releasability is further improved . Instead of the fluororesin, the casting port forming part 56 may be formed of another resin such as a silicone resin, a metal, or the like. Also, if the casting port forming part 56 is formed of a material having low water permeability, the intended object of the present invention can be sufficiently achieved. Here, the casting port forming part 5
The reason why the forming material of No. 6 is not limited to the water-impermeable material is as follows.
This is because if the material is formed of a material having a lower water permeability than the molding die (lower mold 52), the dehydrating action (the action of depositing the raw material) in the peripheral portion of the casting port 54 can be suppressed more than in other portions.

By the way, if the seal portion 55 is too small,
The effect of suppressing the dehydration in the peripheral portion of the casting port 54 is too small, so that the blocking of the casting port 54 (prevention of occurrence of defects) is incomplete. On the other hand, if the seal portion 55 is too large, the dewatering area of the inner surface of the cavity 53 is correspondingly reduced, so that the molding time becomes longer and the production efficiency is reduced. Therefore, the inventor repeated various experiments in order to obtain the optimum size of the seal portion 55, and found that the outer diameter of the seal portion 55 was changed to the maximum thickness size of the cavity 53 (the inner thickness inscribed in the cavity 53). It has been found that the diameter should be set to approximately 0.9 to 2 times the diameter of the tangent circle). By setting such dimensions, it is possible to keep the molding time within an appropriate range and to prevent the casting port 54 from being blocked (to prevent the occurrence of defects).
Can be completely equalized .

In addition, the present invention is not limited to the casting mold of the suspension insulator, and various changes can be made without departing from the gist, for example, the invention can be applied to the casting mold of various ceramic products. Needless to say.

[0052]

As described above, the present invention provides the following:
The effect can be obtained. According to claim 1, the molding die
Non-permeable material is placed around the casting port on the inner surface of the cavity.
Or made of a material with lower water permeability than the mold
The sealing part provided provides
Suppress water action and reduce the accumulation of raw material around the casting port
Can be delayed than other parts. This allows key
Until the inside of the cavity is completely filled with raw material base,
The pouring opening can be prevented from being closed by the raw material base
As a result, voids and streaks cannot be formed inside the molded product,
Goodness will not occur.

Further , the position of the casting port is set in the cavity.
Around the maximum thickness, so that mud
It becomes easier for the serum to flow around. Furthermore, the diameter of the seal
Set within a range of at least approximately 0.9 times the maximum wall thickness.
If it is set, the deposition rate of the raw material base material around the casting
Can be slow enough.

According to the invention of claim 2, the opening diameter of the casting port
At most approximately the maximum wall thickness of the cavity
Since it was set within the range of up to 2 times, the trace of the casting port on the molded product surface
Fit within one convex or concave surface of the molded product,
Finishing process is easy.

According to the third aspect of the present invention, around the casting port,
If no seal is provided, insert the casting port
Near the maximum thickness of the tee,
The opening diameter of the mouth is approximately 0.9 to approximately the maximum thickness.
Since the setting is twice the range, the casting port depends on the raw material base.
Before the material is closed,
Fills without gaps, and voids are formed inside the molded product.
You will not be able to play. In addition, the opening diameter of the casting port
Since the upper limit is almost twice the maximum thickness, molding
The finish processing range for the product should not be excessively large.
Finish processing by post-processing is easy, and dehydration
The reduction of the area is moderately suppressed and the molding time is lengthened.
Nor.

According to the invention of claim 4, both ends of the pipe and
The casting port forming parts and joints in a
Since the casting hole forming part is larger than the outside diameter of the
The joint is locked by the casting
Product, the casting hole forming part, pie
And the joint are firmly locked into the mold
The casting mold that is fixed and has excellent durability is completed. Ma
Also, pipes and joints are connected from outside the mold.
Thus, the workability of attaching the pipe and the joint is good.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a casting mold according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a state of molding (part 1).

FIG. 3 is a longitudinal side view showing a state of molding (part 2).

FIG. 4 is a vertical side view showing a state of molding (part 3).

FIG. 5 is a longitudinal sectional side view of a casting mold showing a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional side view of a casting mold according to a third embodiment of the present invention.

FIG. 7 is a longitudinal sectional side view of a casting mold according to a fourth embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of a casting mold according to a fifth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a casting mold showing a comparative example for explaining the operation and effect of the fifth embodiment of the present invention.

FIG. 10 is a longitudinal side view showing a conventional molding state (part 1).

FIG. 11 is a longitudinal sectional side view showing a conventional molding state (part 2).

FIG. 12 is a vertical side view showing a conventional molding state (part 3).

[Explanation of symbols]

11 ... upper mold (molding mold), 12 ... lower mold (molding mold), 13 ...
Cavity, 14: Casting port, 15: Cylindrical body, 15a: Casting supply path, 17: Raw material base of slurry, 21: Seal part, 22
... pouring port, 31 ... pouring port, 41 ... upper die (molding die), 42
... lower mold (mold), 43 ... cavity, 44 ... pouring port,
45: cylindrical body, 45a: pouring supply path, 51: upper mold (mold), 52: lower mold (mold), 53: cavity, 54
... pouring port, 55 ... sealing part, 56 ... pouring port forming part, 5
9 ... pipe, 60 ... joint, 61 ... pouring supply path.

Claims (4)

(57) [Claims] 1. A casting in which a molded product is cast by supplying a slurry to a cavity in a water-permeable mold through a casting port through a casting supply passage provided in the mold, and dewatering through the mold. in slip casting mold which is adapted to the to the periphery of the casting mouth of the cavitation inner surface, provided with a seal portion formed by a material having a low water permeability than the non-water-permeable material or the mold, the Insert the casting hole into the cavity
Near the maximum thickness of the seal, and the diameter of the seal
Dimensions up to at least about 0.9 times the maximum wall thickness
A casting mold characterized by being set in the range of: 2. An opening diameter of the casting port is at most
Range up to almost twice the maximum thickness of the cavity
The casting mold according to claim 1, wherein: 3. A cavity in a water-permeable mold.
Slip from the pouring port through the pouring supply channel provided in the mold
Is supplied and dewatered through the mold to form
In a casting mold in which a product is cast molded,
A casting port is provided near the maximum thickness portion in the cavity.
And the opening diameter of the casting port is changed to the maximum thickness.
The characteristic is that it is set in the range of about 0.9 to 2 times of the law
Casting mold to be. 4. A pipe forming a casting supply path, and a casting port.
Part and its surrounding seal part are integrated and
Embed and fix a casting hole forming part larger than the outside diameter of the pipe
In a method of manufacturing a cast mold, a penetration for inserting the pipe at the same time as molding of the mold is provided.
Forming a hole and forming the mold simultaneously with the casting.
Embedding the entrance forming part or post-processing with a drill etc.
Alternatively, the casting hole is formed in a recess formed by molding with a mold.
A step of fitting a forming part, and inserting the pipe into the through-hole to form one of the pipes.
The threaded portion formed at the end is attached to the casting port forming part
A step of screwing and connecting from the outside of the mold, and a threaded portion formed at the other end of the pipe.
The greater Joy cement than the outer diameter match screw from the mold external
The casting port forming part, the pipe and the front
The three joints are fixed to the mold so that they do not come off.
And a method of manufacturing a casting mold.