JP2001227648A - Reinforcing ring for spiral gasket and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing ring for a spiral gasket and its manufacturing method reducing cost with an excellent material yield, dispensing with skill for work and hardly attended with danger in manufacturing. SOLUTION: A flat band plate 16 made of metal is bent to form flat annular members 26. The end parts of the annular members are made to butt each other and jointed by welding or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to water, oil, steam,
The present invention relates to a reinforcing ring used for reinforcing a spiral gasket for sealing a fluid such as a gas, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In general, in pipes, containers, and other various equipment used under conditions of high temperature, high pressure, etc., it is necessary to maintain the sealed state of joints and other joints and prevent fluid from leaking to the outside. To prevent this, a gasket is used. As one of the gaskets, a spiral gasket 1 having high sealing properties as shown in FIG. 5 is frequently used. The spiral gasket 1 includes a long thin hoop material 2 made of stainless steel, inconel, or the like, ceramics, asbestos paper,
It is spirally wound in a state where the filler material 3 made of expanded graphite tape or the like is overlapped.

When such a spiral gasket 1 is used under high pressure conditions, it is necessary to strongly tighten the spiral gasket 1 in the width direction in order to increase the hermetically sealed state of joints and the like. At this time, if the spiral gasket 1 is used alone, there is a possibility that the strength may be insufficient and the outer peripheral portion may be broken, or the inner peripheral portion may buckle. Therefore, a reinforcing ring 5 made of stainless steel or the like is fitted around the outer periphery of the spiral gasket 1 to increase its strength. FIG. 5 shows a case in which the reinforcing ring 5 is fitted only to the outer periphery of the spiral gasket 1, but if further reinforcement is required, the reinforcing ring 5 is fitted to both the outer periphery and the inner periphery of the spiral gasket 1. A reinforcing ring may be fitted.

The reinforcing ring 5 having a particularly large diameter is conventionally manufactured by a method shown in FIGS. That is, the manufacturing method shown in FIG. 7 is a manufacturing method mainly applied to a material having a diameter of 300 mm or less, and a flat material 7 is cut into a square to obtain a square material 8, and the square material 8 is pressed. The reinforcing ring 5 is obtained by punching with the machine 10. FIG.
Is a manufacturing method mainly applied to those having a diameter of 1500 mm or less.
Is cut out, a through hole 8a is formed in the center of the square member 8, and the center bolt of the lathe 11 is passed through the through hole 8a to fix the square member 8. Is cut into a circular shape with a cutting tool, the outer periphery is chucked by a lathe 11 and the inner periphery is cut to obtain a reinforcing ring 5.

Further, the manufacturing method shown in FIG. 9 is a manufacturing method mainly applied to a material having a diameter exceeding 1500 mm. First, a flat material 7 (see FIG. (See FIG. 13 (b)), and after a plurality of arc-shaped members 13 are directly cut out from the material 7 (see FIG.
(See (c)), and these reinforcing members 5 are obtained by joining these arc-shaped members 13 in an annular shape using a TIG welding machine 14 or the like (see FIG. 3D). In any of the manufacturing methods shown in FIGS. 7 to 9, the inner peripheral surface of the reinforcing ring 5 has a fitting groove having a shape conforming to the outer peripheral surface of the spiral gasket 1 along the circumferential direction. (Not shown)
Are formed by cutting or the like.

[0006]

However, the conventional methods for manufacturing the reinforcing ring 5 have the following problems. That is, in the manufacturing method shown in FIG. 7, the square plate 8 is punched out by the press machine 10 to form the reinforcing ring 5. Becomes For this reason, the material yield is poor and the cost is increased. In addition, the manufacturing method shown in FIG. 8 requires skill in the work of cutting the square plate 8 with the lathe 11, and involves a danger in the work because the square plate 8 needs to be rotated. In addition, since shavings are generated, the processing requires extra labor and cost. Further, in the manufacturing method shown in FIG. 9, as in the case of the manufacturing method shown in FIG. In addition, since a large number of welding points are required to make the arc-shaped member 13 annular, the welding operation is troublesome, and the influence of thermal distortion during welding is increased, and the dimensional accuracy of the reinforcing ring 5 is reduced. Easy to get worse.

The present invention has been made in order to solve these problems. The present invention has a good material yield and can reduce the cost, does not require any skill in the operation, and has a low danger during production. It is an object of the present invention to provide a spiral gasket reinforcing ring and a method of manufacturing the same. Another object of the present invention is to provide a spiral gasket reinforcing ring which can ensure good dimensional accuracy and a method of manufacturing the same.

[0008]

In order to achieve the above object, a spiral gasket reinforcing ring according to the present invention is characterized in that ends of a flat annular member obtained by bending a flat metal plate are joined together. It is characterized by being bonded to each other (claim 1). Another reinforcing ring according to the present invention is characterized in that ends of a plurality of flat arc-shaped members obtained by bending a flat metal plate are joined to each other by abutting each other. Claim 2). According to the reinforcing ring configured as described above, since the annular member or the arc-shaped member is obtained by bending a flat band plate, the material remaining after forming the annular member or the arc-shaped member is left. Material can be reduced. In particular, as for the reinforcing ring in which the annular members are joined, only one joining point is required, so that even when the joining is performed by welding, thermal distortion can be reduced.

According to a method of manufacturing a reinforcing ring of a spiral gasket of the present invention, a flat metal plate is bent to form a flat annular member, and ends of the annular member are joined to each other by abutting each other. (Claim 3). In another method of manufacturing the reinforcing ring of the present invention, a flat metal plate is bent to form a flat arc-shaped member, and ends of the plurality of arc-shaped members are joined to each other by abutting each other. (Claim 6)

According to the method of manufacturing the reinforcing ring having the above-described structure, the flat strip is bent to form the annular member or the arc-shaped member, so that little residual material is generated. Moreover, since it is not necessary to use a lathe, the skill of the manufacturing operation is not required, and the danger of the manufacturing operation can be reduced. In particular, when a reinforcing ring is formed using an annular member, only one joint is required, so that even when the joining is performed by welding, thermal distortion of the reinforcing ring can be reduced.

In the method of manufacturing a reinforcing ring according to the third aspect of the present invention, the flat band plate is bent to form an intermediate member having a flat annular portion continuous in a spiral shape, and the intermediate member is wound every turn. Preferably, the annular member is formed by cutting the annular member (claim 4). In this case, the annular member can be easily and efficiently formed.

In the above-described method of manufacturing a reinforcing ring according to the third or fourth aspect, it is preferable that the joining of the ends of the annular member is performed in a state where the annular member is fitted to the spiral gasket. (Claim 5). In this case,
When fitting the annular member to the spiral gasket, the diameter of the annular member can be expanded or contracted, so that the annular member can be easily fitted to the spiral gasket.

[0013] In the method for manufacturing a reinforcing ring according to the sixth aspect of the present invention, the joining of the ends of the arc-shaped member may be performed by:
Preferably, the arc-shaped member is fitted to the spiral gasket (claim 7). In this case, the arc member can be easily fitted to the spiral gasket.

In the method of manufacturing a reinforcing ring according to any one of the third to seventh aspects, the outer peripheral surface of the spiral gasket or the inner surface of the spiral gasket may be formed on one side in the width direction simultaneously with the bending of the flat band plate. It is preferable to form the fitting part conforming to the shape of the peripheral surface by plastic working (claim 8). In this case, since the fitting portion can be formed simultaneously with the bending, the number of manufacturing steps can be reduced as compared with the case where the fitting portion is formed in a separate step.

[0015]

Embodiments of the present invention will be described below in more detail with reference to the accompanying drawings. In this embodiment, a case where the reinforcing ring 5 fitted to the outer peripheral side of the spiral gasket 1 shown in FIG. 5 will be described as an example. FIG. 1 is a process chart showing a method of manufacturing a reinforcing ring of a spiral gasket according to an embodiment of the present invention. First, a method of manufacturing this reinforcing ring is shown in FIG.
As shown in (a), a plate-shaped material 7 made of a metal such as a stainless steel plate or a cold-rolled steel plate is prepared.
As shown in FIG. 1 (b), a linear flat strip 16 is formed by being cut to a predetermined width along a longitudinal direction by a shearing process or the like.

Next, a fitting portion 17 having a shape conforming to the outer peripheral surface of the spiral gasket 1 is formed on one side surface portion 16a in the width direction of the flat strip 16 over the entire length by milling or the like. . Spiral gasket 1 shown in FIG.
As shown in FIG. 2, the outer peripheral surface has a mountain-shaped cross section, so that the fitting portion 17 provided on the side surface portion 16a of the flat band plate 16 is formed in a groove having a concave cross section, as shown in FIG.

Subsequently, as shown in FIG. 1 (c), the flat strip 16 is moved to its side portions 16a, 1 by using a bending machine 20.
6b is annularly bent so as to have a predetermined curvature. The bending machine 20 used in this case is provided with three bending rolls 22, 23, 24 on one side surface of the main body 21. The center of rotation of each of the bending rolls 22, 23, 24 is arranged so as to be located at each vertex of the virtual triangle. In addition, each of the bending rolls 22, 23, 24
Are driven to rotate in synchronization with each other by a drive mechanism including a motor and a transmission built in the main body 21. Further, each of the bending rolls 22, 23 and 24 has a guide groove 22 for preventing the flat band plate 16 from falling over during bending.
a, 23a and 24a are formed along the circumferential direction. The bending roll 22 at the upper center is slidable in the vertical direction.

When bending the flat strip 16, each bending roll 22 is driven, and the side face 16 a on which the fitting portion 17 of the flat strip 16 is formed faces upward. , 23, 24 guide grooves 22a, 23a,
The flat strip 16 is pushed in along 24a. As a result, the side portions 16a and 16b of the flat band plate 16 are
At 23 and 24, they are sequentially squeezed and bent into an annular shape. At this time, the flat strip 16 is sequentially bent while pushing in and pushing back the flat strip 16 by alternately repeating the normal rotation and the reverse rotation of the bending roll 22. This bending may be performed by cold working or warm working. In the latter case, the bending becomes easier.

By performing the bending over substantially the entire length of the flat band plate 16, the intermediate member 25 in which the flat annular portion 25a is spirally continuous is obtained. Therefore, this intermediate member 2
5 is removed from the bending machine 20 and, as shown in FIG. 1 (d), is cut by a single turn by a shearing process or a cutting process to obtain an annular member 26 in which one portion on the circumference is separated.
At this time, the surplus portion of the intermediate member 25 at the winding start portion and the winding end portion is also cut and removed.

Next, the annular member 26 is fitted to the outer periphery of the spiral gasket 1. In this case, since the ends of the annular member 26 are not joined, the annular member 26 can be elastically deformed so that the diameter of the annular member 26 becomes larger than the outer diameter of the spiral gasket 1. Therefore, the annular member 26 can be easily mounted on the spiral gasket 1. Subsequently, as shown in FIG. 1 (e), in a state where the annular member 26 is fitted to the spiral gasket 1, the ends thereof are butted together, and the ends are welded by, for example, a TIG welding machine 14. . Thereby, a desired reinforcing ring 5 is obtained.

As described above, according to the method for manufacturing the reinforcing ring 5, since the reinforcing ring 5 is formed by bending the long linear flat plate 16, it is manufactured by conventional punching or cutting. The material yield is better and the cost can be reduced. For example, SUS304
Comparing the case where the reinforcing ring 5 having the outer diameter of 800 mm is manufactured from the stainless steel material 7 of the above with the conventional manufacturing method, it was confirmed that the material cost was only about 1/9. Further, since the diameter of the reinforcing ring 5 can be changed only by changing the curvature at the time of bending, the same material can be used for the spiral gasket 1 having various dimensions, and the material 7 and the flat band plate 16 can be used. Inventory management becomes easy. In addition, no skill is required for the manufacturing operation, and the risk of the manufacturing operation is small. In addition, since the reinforcing ring 5 obtained by the above-described manufacturing method has a continuous rolled structure along its circumferential direction, it has high strength against fatigue and the like, and is finished from the annular member 26 to the reinforcing ring 5. In this case, since there is only one joint, there is little thermal distortion when welding the joint, and a good dimensional accuracy can be obtained.

According to the present invention, the following modifications and application examples can be considered with respect to the above-described embodiment. In the above-described embodiment, the fitting portion 17 extending in the longitudinal direction is formed on one side surface portion 16a by milling or the like before the flat band plate 16 is bent.
6 and the side portion 16a of the flat band plate 16
It is also possible to form the fitting portion 17 in the first embodiment. In this case, as shown in FIG. 3, for example, a mountain-shaped annular projection 22b conforming to the shape of the outer peripheral surface of the spiral gasket 1 is formed on the outer periphery of the bending roll 22 at the upper center, and the annular projection 22b is formed. Is pressed against the side surface portion 16a of the flat band plate 16, the fitting portion 17 can be formed by plastic working. In this way, the flat strip 1
If the fitting portion 17 is formed on the side surface portion 16a of the sixth embodiment, the number of manufacturing steps can be reduced as compared with the case where the fitting portion 17 is formed in a separate step.

The joining method of the ends of the annular member 26 is not limited to the above-mentioned welding, and various joining methods such as brazing, crimping, and mechanical joining can be adopted. FIG. 4 shows various embodiments of these joining methods. In the same figure (a), after cutting the ends which abut each other in the radial direction,
The ends are welded together. Further, in FIG. 2B, after the ends that abut each other are cut obliquely to the radial direction, the ends are welded to each other.

In FIG. 3 (c), the ends which abut each other are cut into hooks, and the protrusions 26 extending in the circumferential direction are cut.
After the formation of the projections 26a and 26b, the projections 26a and 26b are brazed together. Also, in FIG. 3D, step portions 26c and 26d are formed at ends that abut each other, and these step portions 26c and 26d are overlapped and brazed. In the case of the configuration shown in FIGS. 3 (c) and 3 (d), the ends 26a, 26b and 26c, 2
Since the joint area between 6d becomes large, sufficient joint strength can be secured even when brazing.

In FIG. 3E, a convex portion 26e whose one end bulges in the radial direction is provided at one end, and the convex portion 26e is provided at the other end.
e are formed with recesses 26f respectively.
e and 26f are fitted and integrated. Also, FIG.
In this example, a dovetail-shaped concave portion 26g is formed at one end, and a convex portion 26h that engages with the concave portion 26g is formed at the other end, and the two 26g and 26h are fitted and integrated. In the case of the configuration shown in FIGS. 6E and 6F, the ends are mechanically joined to each other, so that work such as welding and brazing can be omitted, and workability is improved.

In the above-described embodiment, the reinforcing ring 5 is manufactured by joining the ends of the annular member 2 where one part of the circumference is separated. Particularly, the reinforcing ring 5 having a large diameter is used. After the flat band plate 16 is bent into an arc shape by the bending machine 20, a surplus portion is removed to form a flat arc-shaped member 27 as shown in FIG.
A plurality of the arc-shaped members 27 may be combined, and the butted ends may be joined by welding or the like. Also in this case, in a state where each arc-shaped member 27 is fitted to the spiral gasket 1, each arc-shaped member 27 is
It is preferable to join them together because the arc-shaped member 27 can be easily assembled to the spiral gasket 1.

In the above embodiment, the reinforcing ring 5 fitted to the outer peripheral side of the spiral gasket 1 shown in FIG. 5 has been described as an example. However, the present invention is not limited to this, and the spiral The present invention can be similarly applied to a reinforcing ring fitted on the inner peripheral side of the shaped gasket 1 and manufactured. In this case, in order to conform to the shape of the spiral gasket 1 shown in FIG. 5, the fitting portion 17 formed on the outer peripheral surface of the reinforcing ring 5 needs to be not a groove but a convex ridge projecting from the outer peripheral surface. . However, the cross-sectional shape of the fitting portion 17 depends on the cross-sectional shape of the inner and outer circumferences of the spiral gasket.
It is formed in various shapes. Further, in the above-described embodiment, the flat band plate 16 is cut out from the flat material 7, but the flat band plate 16 may be obtained from a hoop material formed in a flat band shape in advance.

[0028]

As described above, according to the spiral gasket reinforcing ring and the method of manufacturing the same of the present invention, a flat strip is bent to form an annular member or an arc-shaped member. Since the ends of the arc-shaped members are joined, the material yield can be increased, and the cost can be reduced accordingly. Moreover, the level of skill in the manufacturing operation is not required, and the risk of the manufacturing operation is reduced.

In particular, when a reinforcing ring is formed using an annular member, only one joint is required, so that even when the joining is performed by welding, thermal distortion of the reinforcing ring can be reduced. As a result, good dimensional accuracy of the reinforcing ring can be ensured. Further, in the case of forming an intermediate member in which a flat annular portion is spirally formed by bending a metal flat strip plate and cutting the intermediate member for each turn to form the annular member, The annular member can be formed easily and efficiently.

Further, when joining the ends of the annular member or the arc-shaped member with the annular member or the arc-shaped member fitted to the spiral gasket, the reinforcing ring is efficiently attached to the spiral gasket. Can be assembled well. Further, simultaneously with the bending of the flat band plate, in the case of forming a fitting portion conforming to the shape of the outer peripheral surface or the inner peripheral surface of the spiral gasket on one side surface in the width direction by plastic working, The number of manufacturing steps can be reduced as compared with the case where the fitting portion is formed in a separate step.

[Brief description of the drawings]

FIG. 1 is a process chart showing a method for manufacturing a reinforcing ring of a spiral gasket according to one embodiment of the present invention.

FIG. 2 is a perspective view showing a fitting portion formed on a side surface of the flat band plate.

FIG. 3 is an enlarged sectional view of a main part of a bending roll used in another embodiment of the manufacturing method of the present invention.

FIG. 4 is a perspective view of a main part showing various joining methods of the ends of the annular member.

FIG. 5 is a sectional view showing a state in which a reinforcing ring is fitted to the outer periphery of the spiral gasket.

FIG. 6 is a perspective view showing another embodiment of a reinforcing ring and a method of manufacturing the same.

FIG. 7 is a perspective view showing a conventional method for manufacturing a reinforcing ring.

FIG. 8 is a perspective view showing another conventional manufacturing method.

FIG. 9 is a perspective view showing still another conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spiral gasket 5 Reinforcement ring 7 Material 16 Plate material 16a Side face 16b Side face 17 Fitting part 20 Bending machine 22 Bending roll 23 Bending roll 24 Bending roll 25 Intermediate member 25a Ring part 26 Ring member 27 Arc member

Claims (8)

[Claims] A reinforcing ring for a spiral gasket, wherein ends of flat annular members obtained by bending a flat metal strip are abutted and joined to each other. 2. A spiral gasket reinforcing ring, wherein ends of a plurality of flat arc-shaped members obtained by bending a flat metal plate are joined to each other by abutting each other. 3. A method for manufacturing a spiral gasket reinforcing ring, comprising forming a flat annular member by bending a flat metal plate, and joining the ends of the annular member to each other. Method. 4. The flat member is bent to form an intermediate member in which a flat annular portion is spirally continuous, and the intermediate member is cut for each turn to form the annular member. A method for manufacturing a reinforcing ring for a spiral gasket as described above. 5. The method for manufacturing a reinforcing ring for a spiral gasket according to claim 3, wherein the joining of the ends of the annular member is performed in a state where the annular member is fitted to the spiral gasket. 6. A spiral gasket according to claim 1, wherein a flat plate made of metal is bent to form a flat arc-shaped member, and ends of said plurality of arc-shaped members are joined to each other by abutting each other. A method of manufacturing a reinforcing ring. 7. The method for manufacturing a reinforcing ring for a spiral gasket according to claim 6, wherein the joining of the ends of the arc member is performed in a state where the arc member is fitted to the spiral gasket. 8. A fitting portion conforming to the shape of the outer peripheral surface or the inner peripheral surface of the spiral gasket is formed on one side surface in the width direction of the flat strip by plastic working simultaneously with the bending of the flat strip. The method for producing a spiral gasket reinforcing ring according to any one of claims 3 to 7.