JPH0454579B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is a method in which an inner tube and an outer tube such as a double tube, or an inner body and an outer tube such as a cylindrical body are aligned in an axial direction, a circumferential direction, or teeth,
It belongs to the field of manufacturing technology that is tightly bonded in both directions so that no relative displacement occurs during operation.

<Summary of the gist> Accordingly, the present invention is directed to a method in which a relative displacement occurs in the axial direction, circumferential direction, or both of an outer tube such as an outer tube having a ring-shaped cross section with respect to an inner body such as an inner tube having a circular cross section. This invention relates to a method for manufacturing a bound layered body having a circular cross section, which is restrained and bound so that it does not occur, and in particular, an inner body such as an inner tube or column body having a circular cross section and an outer cylinder having a ring-shaped cross section outside the inner body. In this case, an annular heating and annular cooling are performed on the outer cylinder by shifting the phase and moving in the axial direction to tightly connect the two and prevent slippage. This invention relates to a method of manufacturing a tightly bound layered body having a circular cross section, in which an inner body and an outer cylinder are tightly connected through a body.

<Prior art> As is well known, many corrosion-resistant and wear-resistant pipes are used for piping in chemical plants, etc. A single-layer pipe that satisfies these conditions with a single material has not yet been technically developed, and therefore, in reality, structural forms such as a double-walled pipe with an inner pipe and an outer pipe that function individually are required. It is used.

In addition, back-up rolls with sleeves used for rolling, etc. in steel manufacturing have a structure in which a core material is formed in the shape of a column on the inside, and a wear-resistant sleeve is layered on the outside surface of the core material.

In such a double-layered body with a circular cross-section, such as a double pipe or a back-up roll with a sleeve, in which an outer cylinder with a circular cross-section is layered over an inner body with a ring-shaped cross-section, there are technical aspects and economic conditions. , specification conditions, etc. are complicatedly intertwined, and a structural mode in which the components are mechanically bonded in layers may be preferable to a mode in which they are bonded metallurgically.

<Problems to be Solved by the Invention> In the case of such multi-layer bodies such as piping, there are cases in which a statically set state is maintained during operation, but in an environment with severe thermal changes. It may be used under severe conditions such as repeated rotation or axial movement, and under these conditions, due to thermal behavior and mechanical operation, There may be a relative misalignment between the inner body of the inner tube or columnar body and the outer cylinder with a ring-shaped cross section in the axial direction, circumferential direction, or both directions, resulting in an unfavorable state during operation. , there are cases where a situation must be absolutely avoided, and as a well-known technique for manufacturing to deal with this, interposition of slip-preventing bodies such as knock pins, bolt pins, keys, etc. is used, but none of these methods Also, in the case of
A means is used to allow these anti-slip bodies to pass through the inner or outer surface of one or both of the outer cylinders, so that a portion of them is exposed. Looseness tends to occur in the
In addition, there is a drawback that the surface is not uniform, both from the mechanical structure and the physical conditions regarding thermal behavior. In the case of manufacturing that aims to tighten the process, there are problems in that the process becomes complicated and difficult to manage, and there is also the disadvantage that the manufacturing cost increases as a result.

In addition, there is a technique, for example, as shown in Utility Model Publication No. 13-7757, in which a corrosion-resistant layer such as cement is attached to the inside of a thin-walled iron pipe via a slip-preventing member such as a bump. In this technology, the iron pipe of the outer cylinder is made thin, and the strength of the outer cylinder cannot be increased.

In cases where the outer cylinder is made thicker than the inner body to obtain sufficient strength, manufacturing methods in which the two are joined together by means such as shrink fitting may be affected depending on the size of the outer cylinder. However, there were other drawbacks such as the fact that it was impossible to form the mold, and that temperature control was extremely difficult, and the diameter of the outer cylinder could not be reduced as designed.

In order to ensure the degree of tightness, the outer surface of the inner body and the inner surface of the outer cylinder must be mirror-finished by mechanical processing to maintain adhesion between them, which makes the process extremely complicated. Moreover, there was also the inconvenience that precision was required so strictly that machining was practically impossible.

<Objective of the Invention> The object of the present invention is to provide a technical solution to the problems of manufacturing double pipes and multi-layered bodies in which an outer cylinder with a ring-shaped cross section is tightly connected to an inner body with a circular cross-section, based on the above-mentioned prior art. The objective was to restrain the relative displacement between the inner body and the outer cylinder in the circumferential direction, axial direction, or both directions, and to maintain a uniform bonding state on the outer surface of the outer cylinder and the outer surface or inner surface of the inner body. It is an object of the present invention to provide a method for manufacturing an excellent circular cross-section tightly bound multilayer body which is useful in the field of piping technology in various industries by forming an inner body and an outer cylinder in a tightly integrated manner.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the present invention, which is summarized in the claims described above, is to solve the above-mentioned problem by using an inner body such as an inner tube or a columnar body having a circular cross section. and an outer cylinder with a ring-shaped cross section are formed separately in advance,
A slip-preventing body in the circumferential direction, axial direction, or both directions is formed in advance between the outer surface of the former and the inner surface of the latter, and depending on the design, a separate slip-preventing member is further interposed between the two. The inner body and the outer cylinder are layered relative to each other through a predetermined gap, and the annular heating and cooling around the outer cylinder are applied to the outside of the outer cylinder relative to each other in the axial direction in such a manner that the anti-slip bodies correspond to each other. By shifting the phase to a predetermined value and reducing the diameter of the outer cylinder, the inner body and the outer cylinder are tightly connected. The anti-slip bodies are tightly tied and integrated to form a multi-layered body, and the multi-layer body prevents relative displacement in the circumferential direction, axial direction, or both directions during operation of the multi-layer body, and is always in the initial set state. Technical measures have been taken to make it possible to perform the specified functions without changing the structure.

<Example> Next, an example of the present invention will be described below based on the drawings.

The embodiment shown in FIGS. 1 to 4 is a basic mode of manufacturing a wear-resistant double pipe such as a slurry transport pipe as a tightly bound layered body with a circular cross section. Using low-cost, high-toughness materials such as low-carbon steel with a content of about 0.25%, hemispheres 2, 2, as anti-slip bodies are placed on the inner surface of predetermined positions.
A predetermined number of tubes are integrally formed to protrude at predetermined intervals, and the inner tube 3 as the inner body is made of wear-resistant material, for example, high carbon steel with a carbon content of about 0.55%. A corresponding number of hemispherical recesses 4, 4, . As shown in the figure, the double-pipe blank tube 5 is formed by relatively loose insertion.

Then, the double tube blank tube 5 is set so as to be movable in the axial direction at a predetermined speed as shown by the arrow, and the second
As shown in the figure, as an annular heating means, for example, a high-frequency induction heating device 6 is set in a ring shape on the outer circumference of the outer tube 1, and the high-frequency induction heating device 6 is placed close to the high-frequency induction heating device 6 at a predetermined distance and moved forward and backward in the axial direction. For example, by setting the cooling devices 7, 7 for annular cooling of a ring-shaped shower device such as tap water, and moving the double-pipe tube 5 in the direction of the arrow, the heating device 6 and the cooling devices 7, 7 are set. is made to move relative to the double tube blank tube 5.

Therefore, when the double tube blank tube 5 is moved in the axial direction at a predetermined speed as shown by the arrow, the heating device 6 cools the outer tube 1 by the cooling devices 7 before and after it.
In this process, as shown schematically by the dotted lines in Figs. 2 and 4, if both ends of the heating part are free ends with respect to the cooling part, the second, As shown in Figure 4, it freely expands in diameter and tries to protrude in the circumferential direction, but in reality, both ends of the heated part are connected to the cooling device 7.
Since the cooling portion is restrained by the cooling portion, a bending moment F acts on the portion, causing the portion to yield, and as a result, a ring-shaped curved plastically deformed portion is formed.

Then, as the double tube blank tube 5 moves relatively in the direction of the arrow, the part heated by the heating device 6 and plastically deformed passes through the heated part and is cooled by the cooling device 7 later. On the contrary, the diameter is greatly reduced, so that a large fitting allowance is obtained, and the outer tube 1 is tightly connected to the inner tube 3, and the hemispherical body 2 of the outer tube 1 is connected to the corresponding hemispherical shape of the inner tube 3. It is fitted into the recess 4 and is tightly coupled.

Since this action acts on all circumferential portions of the outer tube 1, by continuously moving the double tube element tube 5 relatively in the axial direction, all portions of the outer tube 1 are reduced in diameter. In the full-double tube blank 5, a tight fit is created with respect to the inner tube 3, and the hemisphere 2 and the hemispherical recess 4 are tightly fitted to each other, resulting in a tight fit in the circumferential and axial directions. A self-tapping double tube is formed that is tied together.

The above-mentioned tightening process is performed regardless of the wall thickness of the inner tube 3, and since it is formed in the full double tube blank tube 5 regardless of the axial length, the outer tube 1 and the inner tube This process has almost no relation to the accuracy of the joint surface of the tube 3, and is extremely effective in manufacturing wear-resistant double tubes, etc., where the inner tube 3 has a large wall thickness and is long. be.

In this way, a self-tight double tube 8 as a multi-layered body as shown in FIG. 3 is obtained, and the outer tube 1 of the outer cylinder and the inner tube 3 of the inner body are tightly connected at all their interfaces. Instead, the set number of hemispheres 2 and hemispherical recesses 4, which serve as anti-displacement bodies, are firmly connected.
It is installed in the piping of chemical plants, etc., and is exposed to high temperatures in the summer.
Even if the outer tube 1 and the inner tube 3 are operated under severe conditions with severe thermal behavior such as being exposed to low temperatures in winter, there will be no relative deviation in the circumferential direction as well as in the axial direction. The greater the number of hemispherical bodies 2 and hemispherical recesses 4 as anti-slip bodies, the more reliably their integral thermal behavior is guaranteed.

In the above-mentioned embodiment, the layered body is a double pipe for use in chemical plants, etc., but the embodiment shown in FIG. This is an embodiment of the roll 8' as a tightly bound layered body with a circular cross section, and the inner body 3' is a cylindrical core that corresponds to the inner tube 3 of the above-mentioned embodiment, and the outer tube 1 is prevented from shifting by a predetermined number of times. A hemispherical recess 4 is formed corresponding to the hemisphere 2 of the body,
In the manufacturing process, as in the above embodiment, annular heating and annular cooling of the outside of the outer cylinder 1 are performed with a predetermined phase shift and relative movement in the axial direction as in FIG. 2, and the diameter of the outer cylinder 1 is reduced. This embodiment is such that the hemispherical body 2 of the shearing prevention body is tightly fitted into the hemispherical recess 4 of the columnar inner body 3' of the shearing prevention body.

Therefore, even in the roll 8' of this embodiment, even under severe dynamic operating conditions, the outer cylinder 1 as a sleeve with respect to the inner body 3' as a core body is not only in the axial direction but also in the circumferential direction. Also in the spiral direction, it can function as designed as a roll of one block in the initial formation without causing any relative deviation. The finishing accuracy of the opposing surface at the boundary with the inner body 3' does not have to be so strict.

As described above, in the present invention, the inner body 3 having a circular cross section may be either a tube or a column, and therefore, the opposing surfaces of the circular cross section where the outer cylinder 1 having a ring-shaped cross section is tightly connected to the inner body 3 are double-sided. It can be applied to either a pipe body such as a pipe or a columnar body, and the connecting surface may be prevented from slipping in the circumferential direction, the axial direction, or both. Regarding the inner body 3 having a circular cross section, for example, wave-shaped anti-slip bodies 41 as shown in FIG. 6 may be formed so as to face each other and be tightly connected, or As shown in FIG. 8, a rack-shaped anti-slip body 42 is formed, or as shown in FIG. Furthermore, as shown in FIG. 9, hemispherical recesses 44, 44 are formed in the outer cylinder 1 and inner body 3, and each recess 44 in the inner body 3 and outer cylinder 1 is formed separately. It is also possible to interpose the sphere 45 of the body as a slip prevention body and tighten it.

It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments. For example, the anti-slip body may be configured to prevent a hemisphere, a hemispherical surface, etc. from shifting in the circumferential direction and in the axial direction. However, it is also possible to form a slip prevention body for either one of them, and the materials used include inexpensive and tough carbon steel pipes, hardened high carbon steel, low alloy steel, and wear-resistant cast steel. or high chromium cast steel or alumina,
Ceramics such as silicon nitride are also used, and the formation of the inner body and outer cylinder using these materials can be appropriately selected depending on the specification conditions and the occasion, and various other forms can be adopted.

<Effects of the Invention> As described above, according to the present invention, there is provided a method for manufacturing a multi-layered body in which an outer tube having a ring-shaped cross section is tightly connected to an inner body such as a tube or column body having a basically circular cross section. , by forming a circumferential, axial, or both-direction slip prevention body at the boundary between the two, and by tightly connecting the two in a state where both are isolated from the outside. The tightly bound layered body prevents displacement due to thermal behavior even under severe operating conditions with large annual temperature fluctuations, and can maintain a stable initial posture and shape, and can withstand intense mechanical movements such as rolls. Even in the case of a multi-layer body such as a rolling machine, the slip prevention between the inner body and the outer cylinder is maintained.
The effect that rolling etc. are performed as designed without any change over time is achieved.

Moreover, since both the inner body and the outer cylinder are shielded from the outside, the inner surface of the inner body and the outer surface of the outer cylinder can maintain a uniform surface phase, preventing corrosive fluids from outside. This provides an excellent effect in that deterioration or change due to sliding with other members is avoided, and the entire surface functions uniformly.

In addition, in the manufacturing process, when layering an outer cylinder with a ring-shaped cross section on the inner body with a circular cross-section and bonding them together, it is possible to directly or through another material to the opposing surfaces of the two. By forming the anti-slip bodies in advance and interposing them facing each other for tightening, there is no need for conventional interposition processes such as dowel pins, bolts, keys, etc., and the inner body and outer cylinder can be tightened just by the tightening process. The effect of process simplification that can be achieved is achieved.

Furthermore, by shifting the phase of annular heating and annular cooling to the outer cylinder, which is layered relative to the inner body, and moving the outer cylinder relative to the outer cylinder in the axial direction, the outer cylinder can have a large fitting allowance regardless of the wall thickness of the inner body. The excellent effect of being able to reliably connect to the inner body through the inner body is achieved.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of embodiments of the invention of this application, and FIGS. 1 to 4 are manufacturing process diagrams of a multilayer body in one embodiment, and FIG. 1 is a vertical sectional view of a relative multilayer part of an inner body and an outer cylinder , FIG. 2 is a partial vertical cross-sectional view of the reduced diameter of the outer cylinder,
Fig. 3 is a partial vertical cross-sectional view of the bound multi-layered body;
5 is a partial vertical cross-sectional view of another layered body corresponding to FIG. 3, and FIGS. 6 to 9 are schematic vertical cross-sectional views of the fastening structure of various anti-slip bodies. 3, 3'... Inner body, 1... Outer cylinder, 2, 4, 41,
42, 43, 44, 45...Slip prevention body.

Claims (1)

[Claims] 1. In a method for producing a bonded layered body with no relative displacement by layering an inner body with a circular cross section and an outer tube with a ring-shaped cross section and then bonding the two, there is a pre-displacement on the opposing surfaces of both the inner body and the outer tube. A preventive body is formed to relatively overlap the two, and annular heating and annular cooling of the outer cylinder is performed by shifting the position in the axial direction, and the outer cylinder and the inner body are tightly connected via the slippage preventive body. A method for manufacturing a tightly bound layered body with a circular cross section, characterized in that: