JP3522089B2 - Method of Partial Wall Thickening of Tube and Partial Wall Thickening Equipment of Tube - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used to form a thickened portion for securing a plate thickness, for example, at a connecting portion on the supporting pillar side when connecting supporting pillars of a steel frame structure by a beam member. The present invention relates to a method for partially increasing the thickness of a pipe and a facility for partially increasing the thickness of the pipe.

[0002]

2. Description of the Related Art Conventionally, a beam member connecting portion on a supporting column side is a beam penetrating method in which a supporting column, that is, a rectangular steel pipe is cut into a plurality of pieces in a length direction, and a groove is formed on each cut surface, and then a diaphragm is attached. However, according to this method, a great deal of time and cost are required for cutting work and groove processing work, and there are problems such as many welding points.

Further, as a construction method in which the rectangular steel pipe is not cut, for example, as shown in Japanese Patent Application Laid-Open No. 7-238636, an inner diaphragm having a backing metal temporarily welded to both sides is inserted into the rectangular steel pipe. After tentatively welding the backing plate on the insertion port side to the inner wall of the rectangular steel pipe, the inner wall of the rectangular steel pipe and the outer periphery of the inner diaphragm are electroslag welded using the through holes. Was proposed, but welding work was required even with this method.

Therefore, it is proposed to form a thickened portion at a desired portion of a metal pipe as disclosed in, for example, Japanese Patent Laid-Open No. 9-76011, which makes welding work unnecessary. In this thickening method, a rectangular tube is set between a fixing device and a compression device, and the rectangular tube is heated by locally heating the rectangular tube with a heating force applied to the rectangular tube. The heating portion is moved in the longitudinal direction to continuously form the thickened portion. At that time,
A heat treatment die is set inside the rectangular tube in order to prevent distortion that tends to occur in the thickened portion.

[0005]

However, according to the above-described thickening method, the outer dimensions of the thickened portion formed may be uneven, and therefore, the metal pipes are used as the columns to connect the beam members. At this time, a non-uniform gap may occur between the two, and good welding (connection) may not be performed. Furthermore, the outer surface of the thickened portion may have a wavy shape (unevenness), which may lead to a decrease in welding accuracy and strength. In addition, since a compressive force is applied to both ends of the metal pipe in the longitudinal direction,
It is difficult to apply a sufficient compressive force uniformly to the heating portions located away from both ends, a suitable thickening portion cannot be formed, and the non-heating portion of the metal tube may be deformed.

Therefore, according to the first aspect of the present invention, a method of partially increasing the thickness of a tubular body, in which the outer dimensions of the formed thickness increase portion can be made uniform and the outer surface and the inner surface of the thickness increase portion can be smoothed The purpose is to provide.

The invention according to claim 4 is the same as claims 1 to 3.
The object of the present invention is to provide a partial thickness increase equipment for a tubular body, which can suitably realize the partial thickness increase method of (1) and can apply a compression force uniformly.

[0008]

In order to achieve the above-mentioned object, in the method for partially increasing the thickness of a pipe according to the first aspect of the present invention, after heating a target portion of the pipe, By applying a compressive force in the longitudinal direction to the tubular body to form a thickened portion at a desired location, and after thickening the tubular body, a molded roll means for shaping the outer surface and an inner surface shaping And the forming part of the tube body are relatively moved in the longitudinal direction of the tubular body, and the outer surface of the thickened part in the heated state is shaped by the forming roll means and
Increased thickness in the heated state by the molding section facing the roll means
It is characterized by shaping the inner surface of the part .

Therefore, according to the first aspect of the present invention, by shaping the outer surface and the inner surface of the thickened portion in the heated state, the outer surface of the thickened portion can have a uniform outer dimension and the thickened portion The outer surface and the inner surface can be smoothed. Therefore, for example, when the tubular body after shaping is used as a column and the beam material is connected to the thickened portion, the outer surface of the thickened portion has a uniform outer shape and is smoothed, There are few gaps between them, or they are uniform and small gaps.

According to a second aspect of the present invention, there is provided a method for partially increasing the thickness of a tubular body according to the first aspect, wherein the outer surface of the thickened portion is flush with the outer surface of the non-thickened portion. It is characterized by doing.

Therefore, according to the second aspect of the present invention, the outer surface of the tube body having the thickened portion can be in a clean state without the protruding member. The method for partially increasing the wall thickness of the tubular body according to claim 3 of the present invention is characterized in that, in the configuration according to claim 1 described above, the inner surface of the thickened portion is shaped flush with the inner surface of the non-thickened portion. It is a feature.

Therefore, according to the third aspect of the present invention, the inner surface of the tubular body having the thickened portion can be made into a clean state without protruding. Further, the partial thickness increase equipment for a pipe according to claim 4 of the present invention is provided with a pair of clamp means capable of holding two positions in the longitudinal direction of the pipe with the target position of the pipe as a center. These clamping means are configured so as to be relatively movable toward and away from each other, and are provided with heating means for heating a target portion of the tubular body, and in the longitudinal direction of the tubular body with respect to the partially thickened tubular body. By relatively moving, the forming roll means for shaping the outer surface and the inner surface of the thickened part in the heated state are shaped
It is characterized in that it is provided so as to face the molding part .

Therefore, according to the fourth aspect of the present invention, both sides of the target portion of the tubular body are clamped by the clamp means, the target portion is heated by the heating means, and then the clamp means is moved relatively close to each other. By applying a compressive force in the longitudinal direction to the tubular body, the thickened portion can be formed at a desired location. Thus after Zoniku, a tube body, the outer
And a molding portion for molding roll means and the inner surface shaping for surface shaping <br/>, by relatively moving in the longitudinal direction of the tube, the forming roll unit, shaping the outer surface of the thickened portion of the heated state The inner surface of the thickened part can be shaped by the molding part.
It At this time, since the compressive force is applied by both clamp means located near the heating part, a sufficient compressive force can be uniformly applied to the heating part.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. 1 to 7 as a state of being adopted for partially increasing the thickness of a round steel pipe.

In FIG. 7A, a round steel pipe 1 as an example of a tubular body has a thickness of 4.5 mm to 50.0 mm,
SM490A, SM with diameter of 100mm-600mm
520B, SS400, SN400B, SN490B, etc. are used. Then, in the round steel pipe 1, a certain range of one location (or a plurality of locations) in the longitudinal direction A is set as a target thickening location B.

In FIG. 1, a partial thickening equipment 10 for a pipe is provided with a supporting means 11 capable of supporting the round steel pipe 1, and the supporting means 11 allows the round steel pipe 1 to have its longitudinal direction A as a lateral direction. Supported. The support means 11 is of a roller conveyor type for supporting the round steel pipe 1 by, for example, a group of hourglass-shaped rollers 12, and is configured to allow movement (conveyance) of the round steel pipe 1 in the longitudinal direction A.

A pair of clamping means 1 which can hold two locations in the longitudinal direction A of the round steel pipe 1 with the intended thickening portion B of the round steel pipe 1 supported inside by the inside.
5, 16 are provided, and the clamping means 15, 16 are configured to be relatively movable toward and away from each other. That is, the clamping means 15 and 16 are configured to allow the round steel pipe 1 to be inserted therethrough, and the inserted round steel pipe 1 can be clamped from the outside. And the clamping means 15, 1
6 is provided, for example, on the carriages 17 and 18, and the carriage 1
It is possible to move in the approaching / separating direction by traveling 7 and 18,
At that time, traveling of the carriages 17 and 18 is performed by a cylinder device provided between the carriage 17 and the floor side, a traveling moving device mounted therein, or the like.

A heating means 20 for heating the thickened portion B of the round steel pipe 1 is provided between the clamping means 15 and 16. As the heating means 20, a high-frequency heating method, a medium-frequency heating method, or the like is adopted, and is configured to allow the round steel pipe 1 to be inserted. The heating means 20 includes a feeding device 21.
Is movable in the longitudinal direction A of the round steel pipe 1,
As the feeding device 21, a screw feeding type or a cylinder type is adopted.

1, 5, and 6, the forming roll means 25 is provided in a state of being positioned outside the one clamping means 15 in the longitudinal direction A, and the forming roll means 25 is partially thickened. The longitudinal direction A for the round steel pipe 1
The outer surface 2a of the thickened portion 2 in the heated state is shaped by being relatively moved to. That is, the forming roll means 25 is composed of four (plural) drum-shaped forming rolls 2.
6, the drum-shaped rolls 26 are arranged so as to form a circular molding surface, and are rotatably supported by a holding member 28 on the frame 27 side via a roll shaft 29. A water-cooling type is adopted as the forming roll means 25, particularly the drum-shaped roll 26.

A pipe inner surface forming means 30 is provided so as to face the forming roll means 25 from the heating means 20. That is, most of the pipe inner surface forming means 30 is positioned to be inserted into the round steel pipe 1, and a large diameter forming portion 31 facing the heating means 20 and a small diameter facing the forming roll means 25. The molding portion 32 is integrated with a stay 33, and is supported by a fixing portion 34 provided outside the other end via the stay 33. The large-diameter molding portion 31 and the small-diameter molding portion 3 of the pipe inner surface molding means 30
For 2, a water-cooled type is adopted.

The partial thickening action of the pipe body in the above-described first embodiment will be described below. First, as shown in FIG. 2, the round steel pipe 1 before the partial thickness increase is supported by the supporting means 1
It is carried in (moved) from one end to the other end side via the group of 12 hourglass-shaped support rolls. At the time of this loading, the round steel pipe 1 moves from the forming roll means 25 to the clamping means 15 and the heating means 2.
No. 0, the clamp means 16 is inserted, and the pipe inner surface forming means 30 is inserted into the round steel pipe 1. Then, by moving a predetermined amount, as shown in FIG.
Between the pair of clamping means 15 and 16 and the heating means 2
It is located within the working range of zero.

Then, both clamping means 15 and 16 are clamped to clamp both side portions of the thickened portion B of the round steel pipe 1. At that time, the round steel pipe 1 is configured with high precision and the pressing force is avoided so that the round steel pipe 1 is not pressed against the hourglass-shaped support roll 12 side more than necessary.

The round steel pipe 1 is provided by the two clamping means 15 and 16.
Before and after both sides of the thickened portion B are clamped, the heating means 20 is opposed to one end side (either end side) of the thickened portion B. In this state, the heating means 20 firstly opposes each other. Local heating of the part takes place. Then, after heating to a predetermined temperature, both clamp means 15 and 16 are moved closer to each other, or one of them is moved closer to the other side.

As a result, as shown by the solid line in FIG. 3, a compressive force in the longitudinal direction A is applied between the clamp means 15 and 16, whereby the compressive force increases the thickness of the heating portion inward and outward to increase the thickness. The part 2 will be molded. At this time, the amount of increase in thickness to the inside is regulated by contact with the large-diameter molding portion 31, and the inner surface 2b of the thickness-increasing portion 2 is shaped by contact with the large-diameter molding portion 31. At this time, the compressive force is applied by both the clamp means 15 and 16 located near the heating part, so that a sufficient compressive force is evenly applied to the heating part, so that a suitable thickness is obtained. The meat portion 2 can be formed, and there is no fear that the non-heated portion of the round steel pipe 1 is deformed.

Then, as shown by the phantom line in FIG. 3, the heating means 20 is moved to the clamping means 16 by the operation of the feeding device 21.
By feeding a predetermined amount to the side, and heating and applying a compressive force in the same manner as described above, the thickened portion 2 is expanded in the longitudinal direction A toward the clamp means 16 side. By repeating this, the thickened portion 2 having a predetermined length in the longitudinal direction A is formed as shown by an imaginary line in FIG. 3, and thereafter, the clamping by the clamping means 15 and 16 is released. The thickened part 2
The round steel pipe 1 is in a state of being slightly shrunk by the molding.

Then, the round steel pipe 1 on which the thickened portion 2 is formed is carried out. At this time, the forming roll means 25 is added to the thickened portion 2.
5, the outer wall 2a of the thickened portion 2 in the heated state is a non-thickened portion, that is, the outer surface 1a of the round steel pipe 1 and the surface thereof. It will be shaped like a sheet. During such shaping, the thickened portion 2
Is in a state of being pushed inward by utilizing the gap S formed between the small diameter molding portion 32 and the amount of pushing inward at that time is regulated by being brought into contact with the small diameter molding portion 32. The inner surface 2b of the thickened portion 2 is shaped again by the contact with the small-diameter molding portion 32.

The round steel pipe 1 on which the thickened portion 2 is formed is carried out by making the drum forming roll group 26 into a drive roll or by another feeding means. By the shaping as described above, the outer surface 2a of the thickened portion 2 can have a uniform outer dimension and can be smoothed. The thickened portion 2 is slightly stretched during shaping. In this way, the round steel pipe 1 in which the thickened portion 2 is formed and the outer surface 2a and the inner surface 2b are shaped, that is, the round steel pipe 1 as shown in FIG. 7B is naturally cooled in a cooling floor or the like. It

When the round steel pipe 1 which is a product is used as, for example, a support and a beam is connected to the thickened portion 2, the outer surface 2a of the thickened portion 2 has a uniform outer dimension as described above. Since it is shaped and smoothed, there is not much space between the two or it is a uniform and small space, so that good welding (coupling) can be performed, and welding accuracy and strength can be further improved.

A compressive force in the longitudinal direction A is applied between the clamp means 15 and 16, so that the heating portion is thickened inward and outward by the compressive force to form the thickened portion 2 and then feed it. The heating means 20 is moved to the clamp means 1 by the operation of the device 21.
When the predetermined amount is fed to the 6 side, as shown in FIG. 4, the large-diameter forming portion 31 that regulates the amount of increase in the thickness of the inner wall is similarly moved to the clamping means 16 side as shown from the solid line to the phantom line. It may be configured to move by a fixed amount.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. That is, when the drum-shaped rolls 26 of the forming roll means 25 act on the thickened portion 2, the outer surface 2a of the heated thickened portion 2 is a non-thickened portion, that is, the outer surface 1a of the round steel pipe 1. It is configured to be shaped with a slightly larger diameter.

According to the second embodiment, as shown in FIG. 7 (C), the round steel pipe 1 can have a thickened portion 2 protruding in a ring shape with respect to the outer surface 1a of the round steel pipe 1. . Next, a third embodiment of the present invention will be described based on FIG.

That is, the forming roll means 25 is provided in the thickened portion 2.
Before the group of drum-shaped rolls 26 of FIG. It is shaped so as to be flush with the inner surface 1b of the steel pipe 1. Immediately after that, the thickened portion 2 is configured such that the outer surface 2a thereof is shaped by the group of drum-shaped rolls 26.

According to the third embodiment, as shown in FIG. 7 (D), the round steel pipe 1 can have the thickened portion 2 protruding in a ring shape only on the outer surface 1a side of the round steel pipe 1. . Next, a fourth embodiment of the present invention will be described based on FIGS.

That is, a square steel pipe 5 is used as another example of the tubular body, and the thickness, diameter and material of the square steel pipe 5 are the same as those of the round steel pipe 1 described above. Then, the thickened portion 5 is molded in the same manner as described above. Also, the forming roll means 2
5A has four (plural) flat forming rolls 26A, these flat forming rolls 26A are arranged so as to form a square molding surface, and the holding member 28A on the side of the frame 27A, It is rotatably supported via a roll shaft 29A.

According to the fourth embodiment, the thickened portion 6
When the square steel pipe 5 on which the is formed is carried out, the flat forming rolls 26A group of the forming roll means 25A act on the thickened portion 6, so that the outer surface 6a of the thickened portion 6 in the heated state is not increased. The meat portion, that is, the outer surface 5a of the square steel pipe 6 is formed to be flush with the outer surface 5a. As a result, as shown in FIG. 12A, it is possible to obtain the square steel pipe 5 in which the thickened portion 6 is formed and the outer surface 6a and the inner surface 6b are shaped.

By shaping the square steel pipe 5 as in the second embodiment, as shown in FIG. 12B, the thickened portion 6 is rectangular with respect to the outer surface 5a. It may be a square steel pipe 5 protruding in a ring shape. Further, by shaping the square steel pipe 5 as in the third embodiment, as shown in FIG.
As shown in (C) of 2, the square steel pipe 5 may have a thickened portion 6 protruding in a rectangular ring shape only on the outer surface 5a side of the square steel pipe 5.

In the first embodiment described above, after the local heating is performed by the heating means 20, both clamping means 1 are carried out.
The thickened portion 2 is formed by applying a compressive force in the longitudinal direction A by 5, 16 and this is a system in which the heating means 20 performs local heating while the compressive force is applied. Good.

In each of the above-described embodiments, shaping is performed by moving the tube body with respect to the forming roll means 25, 25A.
The shaping may be performed by moving 5, 25A.

In the above-described first embodiment, the compressing force is applied by moving both clamp means 15 and 16 close to each other, but this may be a type in which only one is moved.

In each of the above-mentioned embodiments, the shaping roll means 25, 25A is used to perform shaping immediately after the thickening portion 2 is shaped by the clamping means 15, 16, but this is not the thickening step portion. It may move to another shaping process part and may shape, and the thickening part 2 is reheated as needed at that time.

In each of the above-mentioned embodiments, the thickened portions 2 and 6 are formed on the round steel pipe 1 and the square steel pipe 5. For example, the round steel pipe 1 formed by forming the thickened portion 2 is heated in a heating furnace. For example, the square steel pipe 5 having the thickened portion 6 can be obtained by heating the whole uniformly as much as possible by the above-mentioned method and then forming it into a rectangular shape by hot forming. Further, in this case, by heating not only the thickened portion 2 but the whole, residual stress of the steel material and deterioration of the material can be recovered, and residual strain due to heat of the steel material can be eliminated.

In each of the above-described embodiments, the length of the thickened portions 2 and 6 in the longitudinal direction A is arbitrarily set, and the thickened portions 2 and 6 are formed at one place or a plurality of places. It is what is done.

[0043]

According to claim 1 of the present invention described above, by shaping the outer surface and the inner surface of the thickened portion in the heated state,
The outer surface of the thickened portion can have a uniform outer dimension, and the outer surface and the inner surface of the thickened portion can be smoothed. Therefore, for example, when the post-shaped pipe is used as a column and the beam member is connected to the thickened portion, the outer surface of the thickened portion and the beam member whose outer dimensions are uniform and smoothed Since there is not much space between them or they are uniform and small, good welding (coupling) can be performed, and welding accuracy and strength can be further improved.

According to claim 2 of the present invention described above,
The outer surface of the tube body having the increased-thickness portion can be in a clean state without the protruding member, whereby the tube body can be finished neatly and can be easily handled.

According to the third aspect of the present invention described above, the inner surface of the tubular body having the increased-thickness portion can be in a clean state so as not to project. Further, claim 4 of the present invention described above.
According to the method, the both sides of the target portion of the pipe body are clamped by the clamp means, and the target portion is heated by the heating means, and then the clamp means is moved relatively close to each other to compress the pipe body in the longitudinal direction. By adding the, it is possible to form a thickened portion at a desired location. After increasing the wall thickness in this way, the tubular body , the forming roll means for shaping the outer surface, and the inner surface
And a molding portion for shaping, by relatively moving in the longitudinal direction of the tube, the forming roll unit, it is possible to shape the outer surface of the thickened portion of the heated state, of the thickened portion by the molding section
You can shape the surface . At that time, since the compressive force is applied by both clamp means located near the heating part, it is possible to uniformly apply a sufficient compressive force to the heating part, thereby forming a suitable thick part. This can be done and there is no risk of the non-heated part of the tube being deformed.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention and is a side view of a tubular body at a partial thickness increasing facility during a thickness increasing operation.

FIG. 2 is a side view at the time of carrying in the pipe body in the partial thickness increase equipment for the pipe body.

FIG. 3 is a vertical cross-sectional side view of a main part of the tubular body at the time of a thickness increasing operation in a partial thickness increasing facility.

FIG. 4 is a vertical cross-sectional side view of an essential part showing a modified example at the time of a thickness increasing operation in the partial thickness increasing equipment of the tubular body.

FIG. 5 is a front view of a forming roll means portion in the partial thickness increasing equipment for the tubular body.

FIG. 6 is a vertical cross-sectional side view of a forming roll means portion in the partial thickness increasing equipment for the tubular body.

FIG. 7 is a partially cutaway perspective view showing the various round steel pipes.

FIG. 8 shows a second embodiment of the present invention and is a vertical cross-sectional side view of a forming roll means portion in a partial thickness increasing equipment for a pipe body.

FIG. 9 shows a third embodiment of the present invention and is a vertical cross-sectional side view of a forming roll means portion in a partial thickness increasing equipment for a pipe body.

FIG. 10 shows a fourth embodiment of the present invention and is a front view of a forming roll means portion in a partial thickness increasing equipment for a pipe body.

FIG. 11 is a vertical cross-sectional side view of a forming roll means portion in the partial thickness increase equipment for the tubular body.

FIG. 12 is a partially cutaway perspective view showing the various square steel pipes.

[Explanation of symbols]

1 Round steel pipe (tube) 1a exterior 1b inner surface 2 thickening part 2a exterior 2b inside 5 square steel pipe (tube) 5a exterior 6 thickening part 6a exterior 6b inner surface 10 Partial thickening equipment 11 Supporting means 15 Clamping means 16 Clamping means 20 Heating means 21 Feeder 25 Forming roll means 26 Drum-forming Roll 25A forming roll means 26A Flat Form Roll 30 Pipe inner surface forming means 31 Large diameter forming part 32 Small diameter forming part 35 Molding Department A longitudinal direction B thickened part

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Claims (4)

(57) [Claims] 1. After heating a target portion of the tubular body,
By applying compressive force in the longitudinal direction to this pipe, a thickened portion is formed at the desired location, and after thickening the pipe and outer surface
A molding roll means for molding and a molding part for shaping the inner surface ,
By relatively moving in the longitudinal direction of the tubular body and shaping the outer surface of the thickened portion in the heated state by the forming roll means ,
By the forming part facing the forming roll means,
A method of partially increasing the thickness of a pipe body, which comprises shaping the inner surface of the increased thickness portion . 2. The method of partially increasing the thickness of a tubular member according to claim 1, wherein the outer surface of the thickened portion is shaped flush with the outer surface of the non-thickened portion. 3. The method for partially increasing the thickness of a tubular body according to claim 1, wherein the inner surface of the thickened portion is shaped flush with the inner surface of the non-thickened portion. 4. A pair of clamp means is provided which is capable of holding two locations in the longitudinal direction of the tubular body, with the intended location of the tubular body being inside, and these clamp means are relatively movable toward and away from each other. The heating means for heating the target portion of the pipe body is provided, and by moving the pipe body having undergone the partial thickness increase in the longitudinal direction of the pipe body, the thickness increase of the heated state is increased. Forming roll means for shaping the outer surface and the inner surface
A partial thickness increasing equipment for a pipe body, which is provided so as to face a shaping portion to be shaped .