JP2914530B2 - Repair method of slurry mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a resin slurry mold.

[0002]

2. Description of the Related Art A pressure casting method using a gypsum mold has a poor production efficiency. Therefore, a so-called pressure casting method has been developed.
No. 9 ceramic pressure casting mold is available. The production method is as described in, for example, JP-A-63-31711.

FIG. 5 is a cross-sectional view of a slurry mold. The slurry mold includes a backing layer 102 of cement or the like on a reinforcing frame 101 such as an iron plate.
And a porous layer 103 mainly composed of a resin such as epoxy.
The porous layer 103 has a plurality of hollow passages 10 in a layer structure.
4 are arranged. The upper surface in the figure is the surface on the cavity side.

FIGS. 6 (a) to 6 (c) are views showing a conventional method for repairing a slurry mold, in which the porous layer 103 is cracked for some reason and a chip 105 is generated (FIG. 6).
(A)), a porous layer forming slurry 106 mainly composed of an epoxy resin having the same composition as the porous layer 103
Is filled and repaired (FIG. 6B).

[0005]

As shown in FIG. 6 (c), when the slurry is cast into the repaired mold, the portion indicated by the arrow (non-repair portion) has moisture reaching the hollow passages 104, 104. Although the sound inlaid layers 107 and 107 are formed, the flow indicated by the arrow (repaired part) is the boundary layer 1
08,108, it turned out that it does not reach the hollow path 104,104.

In this method, the porous layer forming slurry 106 is filled for repair.
Is a mixture of resin and water, the water is absorbed by the non-repaired portion of the porous layer 103 by capillary action, and at this time, a part of the resin moves together with the water and clogs the fine gaps of the porous layer 103. This is because a non-water-permeable layer is generated near the boundary layer 108 in FIG.

Further, a slurry 106 for forming a porous portion of a repaired portion is provided.
In the process of hardening, water in the porous forming slurry 106 is insufficiently absorbed by the porous 103, so that desired continuous pores are not formed in the repaired portion, and water in the slurry at the time of casting is smoothly moved. If not performed, the inlaid layer 107 facing the repaired portion has a very high moisture content and becomes soft, so that the quality of the molded body is significantly reduced.

[0008] However, it is not preferable to dispose of the mold because it has cracks or chips in the slurry mold, and there is a need for an improved repair method.

[0009]

SUMMARY OF THE INVENTION In order to meet the above-mentioned requirements, the present invention includes a method for manufacturing a porous layer of a mold, which includes a defective portion such as a crack or a chip, including a hollow portion behind the defective portion. A large portion is cut out to form a concave portion, and the end opening of the hollow path exposed to the concave portion is connected with a flexible wire, and a seal resin is applied to the inner surface of the concave portion. It is characterized in that the flexible wire is removed after the forming slurry is poured and solidified.

[0010] Since a hollow path is newly formed in the repaired part and this hollow path is connected to the existing hollow path, the water flow capacity of the repaired part is ensured.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. Since the point of the method of the present invention is to form a hollow passage in the repaired portion, a wire clipper useful for forming the hollow passage will be described first. FIG. 1 is a perspective view of a wire clipper suitable for the repair method of the present invention, and FIG. 2 is a sectional view of the same.

The wire clipper 1 is a substantially cubic member made of a flexible material such as plastic, and is a flexible wire 2 or 3 made of solid silicon rubber or the like as a wire for forming a hollow path.
The first U-groove 4 and the second U-groove 5 are formed perpendicular to each other so that they can be fitted with each other (see FIG. 2). Have been. Next, a method of repairing a slurry mold using the wire clipper 1 described above will be described.

FIGS. 3A to 3F are explanatory views of the repair method according to the present invention. FIG. 3A shows a case in which a defective portion 10 is formed in the porous layer 11 due to cracking or chipping as shown in FIG. FIG. 3 (b)
As shown in (1), a large portion including the defective portion 10 and the hollow passage 12 behind the defective portion 10 is cut out to form a concave portion 13.

Next, flexible wires 2 and 3 made of solid silicone rubber or the like are prepared, and one end of the first flexible wire 2 is inserted into the end opening 12a of the hollow path 12 on the left side of the figure, and one end of the second flexible wire 3 is inserted. To the end opening 12 of the hollow path 12 on the right side of the figure.
b.

The first and second flexible wires 2,
3 are crossed as shown in FIG. 3 (c), the intersections are connected by the wire clipper 1 described with reference to FIG. 1, and the other ends of the first and second flexible wires 2 and 3 are pulled out of the recesses 13 respectively. Next, a sealing resin 18 is applied to the inner surface of the recess 13.

A slurry 14 for forming a porous layer is poured into the recess 13 and solidified (FIG. 3D). Next, the flexible wires 2 and 3 are pulled out, and new hollow paths 15 and 16 are extracted.
Is formed on the porous layer 17 in the recess 13 (FIG. 3).
(E)). The two openings 17a and 17b formed on the upper surface are filled with resin (FIG. 3 (f)).

FIG. 4 is an operation diagram of the slurry mold repaired by the method of the present invention, in which the water in the slurry passes through the non-repaired portions of the porous layers 11, 11 as indicated by arrows, and the hollow channels 12, 11,
It reaches 12.

On the other hand, the moisture that has passed through the porous layer 17 at the repaired portion reaches the hollow passages 15 and 16 as shown by the arrows. The water collected as in the left hollow passage 12 → the hollow passage 15 → the communication hole 6 → the hollow passage 16 → the right hollow passage 12 flows as shown by the arrow and is smoothly discharged out of the mold. The present embodiment is an example in which the first and second flexible wires 2 and 3 are crossed and connected by the wire clipper 1, but the end 12a of the hollow passage 12 exposed to the recess 13 is provided.
If the hollow paths 12, 12 of the non-repair part connected to 12b communicate with the non-repair part, it is not necessary to cross and connect with the wire clipper 1.

[0019]

As described above, according to the present invention, a new hollow path is formed in the repaired part and this hollow path is connected to the existing hollow path, so that the repaired part is the same as the non-repaired part. Thus, the water content of the molded body facing the repaired portion does not become extremely high, and a molded body of high quality can be obtained.

In addition, since the hollow path forming wires connected to the existing hollow path are crossed and connected to each other in the repaired portion, after the hollow path forming wire is pulled out, the same as before the repair through the crossing / connecting portion. The communicating hollow path can be formed in the repaired portion. Further, the repair of the slurry mold can be easily performed, and the life of the mold can be extended.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wire clipper suitable for the repair method of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is an explanatory diagram of a repair method according to the present invention.

FIG. 4 is an operation diagram of a slurry mold repaired by the method of the present invention.

FIG. 5 is a sectional view of a slurry mold.

FIG. 6 is a view showing a conventional method for repairing a resin mold.

[Explanation of symbols]

2,3 ... Wire for forming hollow path (flexible wire), 10
... Defects, 11 ... Porous layers, 12 ... Hollow paths, 12a, 1
2b: end opening, 13: recess, 14: slurry for forming a porous layer, 15, 16: new hollow path, 17: new porous layer, 17a, 17b: opening 18: sealing resin.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Yoshihiro Tsugami Inventor 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Tochiki Kiki Co., Ltd. 2-1-1 Nakajima Inside Tohki Kiki Co., Ltd. (56) References JP-A-63-31711 (JP, A) JP-A-61-160205 (JP, A) JP-A-52-134611 (JP, A) (58) Fields surveyed (Int.Cl. ⁶ , DB name) B28B 1/26 101 B28B 1/48

Claims (2)

(57) [Claims] 1. In a slurry mold having a hollow channel through which water or air passes inside or circumscribed in a porous layer, a crack such as a crack or a chip is generated in the porous layer of the slurry mold. The concave portion is formed by cutting off the peripheral portion including the defective portion and the hollow path behind the concave portion, and connecting one end of the hollow path forming wire to the end opening of the hollow path exposed to the concave portion, and the other end outside the concave portion. A method for repairing a slurry mold, comprising: drawing out, applying a sealing resin to the surface of a concave portion, pouring a slurry for forming a porous layer into the concave portion, solidifying the slurry, and removing the wire for forming a hollow path. 2. The hollow-path forming wire is prepared for each end of the hollow path exposed to the recess, and one end of the hollow-path forming wire is connected to the end of the hollow path, and the other end of the hollow-path forming wire is opposed to the other end. While crossing and connecting with the hollow path forming wire, the other end of the hollow path forming wire is set in a state of being pulled out of the concave portion, and after applying a sealing resin to the concave portion, the porous layer is formed in the concave portion. 2. The method for repairing a slurry mold according to claim 1, wherein the wire for forming the hollow path is removed after the slurry is poured and solidified.