JPH11300723A - Rubber mold for cip molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber mold for CIP molding by which sealing work is facilitated and working strength can be decreased. SOLUTION: A rubber mold for CIP molding with a metal mandrel is provided with a cylindrical rubber mold main body 1, a rubber lid body 4 fitted on one end part of the rubber mold main body, a metal mandrel 5 with a lid consisting of a lid part 6 fitted on another end part of the rubber mold main body and a mandrel part 7 stood at the center and hose bands 12 and 13 respectively tightly clamping the outer peripheries of both end parts of the rubber mold main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rubber mold for CIP (cold isostatic press) molding, and more particularly to a rubber mold for CIP molding having a metal mandrel for obtaining a cylindrical molded body.

[0002]

2. Description of the Related Art Conventionally, this type of rubber mold for CIP molding is, for example, as shown in FIG. 4, provided with a cylindrical rubber mold body 31 and one end (the upper end in FIG. 4) of the rubber mold body 31. Fitted rubber flanged lid 32
On the inner surface (upper surface in FIG. 4), a recess 33 for accommodating a pedestal portion of a mandrel with a pedestal described later is formed, and is formed of rubber fitted to the other end portion (lower end portion in FIG. 4) of the rubber mold body. Of the flanged lid 34 and the flanged lid 34
A metal-made pedestal 37 with a pedestal portion 35 and a mandrel portion 36 erected at the center of the pedestal portion 35, which are fitted into the concave portion 33, the both ends of the rubber mold body 31, the lids 32 with both flanges, And sealing tapes 38 and 39 made of a vinyl tape for sealing the joints of the two. The rubber mold for CIP molding is, for example, used in manufacturing a submerged nozzle used in a process for continuous casting of steel, in which a pedestal portion 35 of a pedestal mandrel 37 is fitted to a flanged lid 34 fitted in a recess 33 to form a rubber mold body. After fitting the lower end of the rubber mold body 31, refractory raw material granules (not shown) such as alumina-graphite are filled in the rubber mold body 31, and a flanged lid 32 is attached to one end of the rubber mold body 31. After that, the joint portions between the both ends of the rubber mold body 31 and the lids 32 and 34 with flanges are extended to the outer surfaces of the flanges of the lids 32 and 34 with flanges, and the sealing tape 38 and
Sealing is performed at 39 to prevent intrusion of the pressure-doubling solution, and is used for CIP molding.

[0003]

However, the conventional CIP
In molding rubber molds, the joints between both ends of the rubber mold body and the lids with both flanges must be sealed with a seal tape, which makes sticking and peeling of the seal tape troublesome, and joining the other end. At the time of sealing the part, the rubber mold must be turned over, and there is a problem that the working strength is increased. Then, an object of the present invention is to provide a rubber mold for CIP molding which can facilitate the sealing operation and reduce the operation strength.

[0004]

Means for Solving the Problems To solve the above problems, a rubber mold for CIP molding of the present invention is a rubber mold for CIP molding having a metal mandrel,
A cylindrical rubber mold body, a rubber lid fitted to one end of the rubber mold body, a lid fitted to the other end of the rubber mold body, and a mandrel erected at the center thereof. A metal mandrel with a lid and hose bands for tightening the outer periphery of both ends of the rubber mold body. It is preferable that at least a lid portion of the mandrel with a lid is formed with a void opening outward. It is preferable that a tapered surface having a smaller diameter toward the outside is formed on the outer periphery of the lid of the mandrel with the lid. In addition, a stepped small-diameter portion is formed on the inner side of the lid portion of the mandrel with the lid, and a ridge portion integrally formed on the inner periphery of the other end portion of the rubber mold body is provided in the stepped small-diameter portion so as to be fittable. Preferably.

The rubber mold body has a JIS hardness of 60-8.
The lid is preferably made of rubber which is an elastic structure having a JIS hardness of 85 to 95 degrees. It is desirable that the mandrel with the lid is made of a rigid steel such as stainless steel, and the hose band is made of a rigid metal such as stainless steel. It is desirable that the void of the mandrel with a lid is also formed in the mandrel part. In each void, the thickness of the cylindrical part in the lid is 1/15 or more of the diameter of the lid, and the thickness of the ceiling is It is desirable that the diameter of the lid is at least 1/8 of the diameter of the mandrel, and the thickness of the cylindrical portion and the ceiling at the mandrel is at least 1/10 of the diameter of the mandrel. It is desirable that the diameter of the tapered surface on the outer periphery of the lid of the mandrel with the lid be reduced by 1 to 3% of the total thickness. Also, the stepped small diameter part of the lid of the mandrel with lid is
The outer diameter is preferably 98 to 98.5% of the inner diameter of the rubber mold body, the thickness is preferably about 10 mm, and the lowermost inner diameter of the ridge portion of the rubber mold body is 96 times the inner diameter of the rubber mold body.
It is desirably about 97%.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a longitudinal sectional view showing an example of an embodiment of a rubber mold for CIP molding according to the present invention, and an enlarged view of a main part of FIG. In FIG. 1, reference numeral 1 denotes a cylindrical rubber mold body made of rubber, which is an elastic structure having a JIS hardness of 60 to 80 degrees.
On the inner periphery of the other end (the lower end in FIGS. 1 and 2), a projecting ridge 2 having a trapezoidal cross section is formed integrally with a stepped small-diameter portion of a lid of a mandrel with a lid described later. The inner diameter of the ridge 2 is set to 96 to 97% of the inner diameter of the rubber mold body 1 so that the lowermost end diameter of the molded body is substantially the same as the diameter of the other parts. A peripheral groove 3 for engaging a hose band described later is formed on the outer periphery of the other end of the rubber mold body 1. Reference numeral 4 denotes a lid with a flange fitted to one end of the rubber mold body 1. The lid with a flange 4 is made of rubber, which is an elastic structure having a JIS hardness of 85 to 95 degrees.

Reference numeral 5 denotes a mandrel with a lid comprising a lid 6 fitted to the other end of the rubber mold body 1 and a mandrel 7 standing upright at the center of the mandrel. It is made of metal that is the body. In the lid 6 of the mandrel 5 with a lid, a circular cavity 8 opening outward (opposite to the mandrel) is formed by lightening to reduce the weight of the rubber mold. Numeral 8 communicates with a cylindrical cavity 9 formed in the mandrel part 7 by the same lightening process. The cavity 8 of the lid 6 is formed such that the thickness of the cylindrical portion of the lid 6 is at least 1/15 of the diameter of the lid 6 and the thickness of the ceiling is at least 1/8 of the diameter of the lid. Provided,
The cavity 9 of the mandrel portion 7 is provided such that the thickness of the cylindrical portion and the ceiling portion of the mandrel portion 7 is 1/10 or more of the diameter of the mandrel portion. A tapered surface on the outer periphery of the lid 6 of the lid-equipped mandrel 5 is tapered outward at a rate of 1 to 3% of the total thickness in order to prevent the lid-equipped mandrel 5 from coming off during CIP decompression. 10 are formed. Further, a stepped small-diameter portion 11 is formed in the lid 6 of the mandrel 5 with a lid inward (the mandrel portion side). The stepped small-diameter portion 11 of the lid portion 6 is fitted with the ridge portion 2 of the rubber mold body 1 as described above, and has an inner diameter of 98 to 98.5% of the inner diameter of the rubber mold body 1 and about 10 mm. It has a thickness of

In order to prevent infiltration of pressure-doubled water during CIP molding, reference numerals 12 and 13 denote outer periphery of both ends of the rubber mold body 1 to which the lid 4 with the flange and the lid 6 of the mandrel 5 with the lid are fitted respectively. As shown in FIG. 3, the hose bands 12 and 13 are tightly tightened, and the two hose bands 12 and 13 are provided with a steel band 14 having a rack cut on one side and attached to one end of the steel band 14 so that the other end can be inserted therethrough. It comprises a housing 15 and a bolt 16 rotatably provided on the housing 15 and having a hexagonal tightening opening which is fitted to a rack of the steel band 14 and has a tightening pressure of 100 kg / cm.
-Made of metal such as stainless steel that can withstand s.

In order to form a molded body such as an immersion nozzle using the rubber mold for CIP molding described above, first, the rubber mold body 1 is attached to the lid 6 of the mandrel 5 with a lid that is erected.
After the other end of the rubber mold body 1 is tightened, the hexagonal opening of the hose band 13 engaged with the circumferential groove 3 is rotated by an air driver or the like, and the steel band 14 is tightened to tighten the outer periphery of the other end of the rubber mold body 1. I do. Next, the rubber mold body 1
Is filled with refractory raw material granules (not shown) such as alumina-graphite, a flanged lid 4 is fitted to one end of the rubber mold body 1, and then fitted around the outer periphery of one end of the rubber mold body 1. The hexagonal hole of the hose band 12 is rotated by an air driver or the like, and the steel band 14 is tightened to tighten the outer periphery of one end of the rubber mold body 1.
IP molding is performed. At the time of the CIP molding, the outer periphery of both ends of the rubber mold body 1 in which the lid 4 with the flange 4 and the lid 6 of the mandrel 5 with the lid are fitted is tightened by the hose bands 12 and 13, so that the pressure is increased at the time of pressurization. Water is prevented from penetrating into the rubber mold body 1, and the outer periphery of the lid 6 of the mandrel 5 with the lid is a tapered surface 10 in the opposite direction. The escape from the mold body is prevented. Next, after CIP molding, both hose bands 12, 1
3 is loosened, the lid 4 with the flange and the mandrel 5 with the lid are removed from the rubber mold body 1 and the molded body is taken out from the rubber mold body 1. The fastening by the hose band 13 for tightening the outer periphery of the other end of the rubber mold body 1 is performed as follows.
It may be performed after filling the refractory raw material granules.

Here, when the immersion nozzle was CIP-molded using the above-described rubber mold for CIP molding and a conventional one, the number of reversing operations, the operation time (including mold assembly and demolding), and the water leakage defect rate were as shown in the table. As shown in FIG.

[0011]

[Table 1]

From Table 1, it can be seen that according to the rubber mold for CIP molding according to the present invention, the working time can be reduced to about 30% of that of the conventional one, the working strength can be reduced, and the water leakage defect rate can be reduced to 16%. %.

[0013]

As described above, according to the rubber mold for CIP molding of the present invention, the sealing is performed by the hose bands for tightening the outer periphery of both ends of the rubber mold body. Can be easily performed, and the working time required for the mold assembly and demolding can be greatly reduced, and it is not necessary to reverse the rubber mold, and the working strength can be reduced. The weight of the rubber mold can be reduced by forming a cavity that opens outward at least in the lid of the mandrel with a lid. By forming an inversely tapered surface on the outer periphery of the lid of the mandrel with a lid, it is possible to prevent the mold with the lid from coming off due to springback during CIP decompression. Also, by fitting the ridge of the rubber mold body to the stepped small diameter portion formed on the inner side of the lid of the lid of the mandrel with the lid, the watertightness is increased, and the water leakage failure rate can be improved. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a rubber mold for CIP molding according to the present invention.

FIG. 2 is an enlarged view of a main part of the rubber mold for CIP molding of FIG.

FIG. 3 is a perspective view of the rubber mold for CIP molding shown in FIG. 1, in which a part of a hose band is omitted.

FIG. 4 is a longitudinal sectional view of a conventional rubber mold for CIP molding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber mold main body 2 Protrusion part 4 Flanged lid 5 Mandrel with lid 6 Lid 7 Mandrel part 8 Empty space 9 Empty space 10 Tapered surface 11 Stepped small diameter part 12 Hose band 13 Hose band

Continued on the front page (72) Inventor Tsutomu Iwaguchi 1 Minamito, Ogakie-cho, Kariya-shi, Aichi Pref. Toshiba Ceramics Co., Ltd. Kariya Works Co., Ltd.

Claims (4)

[Claims] 1. A rubber mold for CIP molding having a metal mandrel, comprising a cylindrical rubber mold body, a rubber lid fitted to one end of the rubber mold body, and a rubber mold body. It is characterized by comprising a mandrel with a metal lid consisting of a lid fitted to the other end and a mandrel erected in the center of the lid, and a hose band for tightening the outer periphery of both ends of the rubber mold body. Rubber mold for CIP molding. 2. The rubber mold for CIP molding according to claim 1, wherein a void that opens outward is formed in at least the lid portion of the mandrel with the lid. 3. The rubber mold for CIP molding according to claim 1, wherein a tapered surface having a diameter decreasing outward is formed on an outer periphery of a lid of the mandrel with the lid. 4. A stepped small-diameter portion is formed on the inner side of a lid portion of the lid-equipped mandrel, and a ridge portion integrally formed with the inner periphery of the other end of the rubber mold body is fitted into the stepped small-diameter portion. The rubber mold for CIP molding according to claim 1, 2 or 3, wherein the rubber mold is provided so as to be capable of being provided.