JP2002113516A - Method and apparatus for manufacturing special shape tube with helical rugged pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve manufacturing efficiency by stably running a tube stock while restricting bend of the tube stock by a press roller between a squeeze roll and a pre-forming stand when forming in line a special shape tube having a helical rugged pattern. SOLUTION: After both end parts in a plate width of a metal band of an open tubular shape are butted by he squeeze roll, both plate width end parts butted are welded, a tube stock is passed through a pre-forming stand integrating a pre-forming roll to indent plural recessed parts to a peripheral face of the tube stock in the circumferential direction and a forming stand integrating a forming roll to be fitted into the recessed part, plural helical rugged patterns are formed to the circumferential direction of the tube stock, at this time, a press roll apparatus is arranged between the squeeze roll and the pre-forming stand, bend of the tube stock is restricted by pressing force of the press roll.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a deformed pipe in which a plurality of concavo-convex patterns spiraling in the pipe axis direction are formed in a circumferential direction.

[0002]

2. Description of the Related Art Deformed pipes are used as decorative building materials in place of conventional circular pipes by utilizing the designability and discrimination derived from the shape. Examples of this type of deformed tube include a deformed tube having a plurality of uneven portions in the circumferential direction, a deformed tube having an uneven portion parallel to the tube axis, and a deformed tube having a spiral uneven portion formed in the tube axis direction. It has been known. Above all, deformed pipes in which a plurality of helical irregularities spiraled in the pipe axis direction are formed in the circumferential direction include irregularities in the pipe wall, including building members that utilize high designability and distinctiveness. Since it has the function of adjusting resistance and fluid contact, it is also used for piping applications, heat exchange applications, etc.

A deformed pipe having a plurality of concave and convex portions in the circumferential direction is
It is conventionally manufactured by various methods such as a drawing method using a die and a roll forming method. In the method of drawing a raw tube with a die (Japanese Patent Application Laid-Open No. 63-248515), although a deformed tube having a good cross-sectional shape is manufactured, the die needs to be changed according to the size and the shape of the deformed tube. Therefore, there is a disadvantage that productivity is low. Further, the roll forming method of producing a deformed pipe by a rolling mill combining a roll with a roll or a flat roll (Japanese Patent Laid-Open No. 57-142715) has high productivity,
By using a spiral guide or die provided on the exit side of the rolling mill, a deformed pipe having a plurality of irregularities with a spiral undulation in the pipe axis direction can be manufactured. However, in this method, it is necessary to prepare a large number of rolls for forming deformed pipes having various cross-sectional shapes, and the rolls must be frequently changed in accordance with the shape change. In addition, there is a drawback that a guide and a die for giving a spiral angle are easily worn.

Accordingly, the present inventors have proposed a method of manufacturing a deformed pipe having a spiral uneven pattern formed in the pipe axis direction by arranging rolls at an angle to a plane perpendicular to the pipe axis of the raw pipe. This was proposed in Japanese Patent Application Laid-Open No. 10-314837. In this method, the number of rolls corresponding to the number of concave portions of the deformed pipe is arranged in the circumferential direction of the raw pipe, and the concavo-convex pattern is adjusted by the amount of reduction of each roll, so that the production efficiency is high, the number of rolls to be prepared and There is an advantage that deformed tubes having various cross-sectional shapes can be manufactured only by the amount of reduction of each roll,
Even when a welded pipe is used as a material, a deformed pipe having high symmetry in cross-sectional shape and good quality can be manufactured.

[0005]

SUMMARY OF THE INVENTION When applied to in-line manufacturing in which a conventional shaped pipe forming stand according to a conventional direction is incorporated into a pipe making line and formed, a forming roll rolling force and a driving force for pushing a raw tube into the forming stand. Accordingly, a compressive force acts on the raw pipe in the pipe longitudinal direction. In addition, as shown in FIG. 1a, when the pipe is being rebuilt after the pipe has been stopped halfway due to a stoppage of work, or due to poor welding, the pipe in the width direction is abutted against the raw pipe during the pipe forming. Between the squeeze roll 1 and the preliminary stand 10, the welded portion wc and the unwelded portion wo are mixed in the raw tube Po. In particular, when an unwelded portion wo occurs between the squeeze roll 1 and the preliminary stand 10, the tube longitudinal direction compressive force acts on the raw tube Po in such a state. It becomes unacceptable and a bend B occurs as shown in FIG. 1b. As a result, it is necessary to temporarily stop the pipe making, remove the bent portion B, and rebuild the pipe, which causes a problem that the manufacturing efficiency is reduced.

[0006]

SUMMARY OF THE INVENTION The present invention has been devised to solve such a problem. A press roll device is provided between a squeeze roll and a stand-by stand to perform in-line production. An object of the present invention is to manufacture a deformed pipe having a good cross-sectional shape stably while suppressing the bending of the raw pipe. In order to achieve the above object, the present invention provides a metal pipe having an open pipe shape in which both ends in the width direction are squeezed with a squeeze roll, and the butted ends in the width direction are welded. When forming a plurality of spiral irregularities in the circumferential direction of the raw tube through a preforming stand incorporating a preforming roll attached to the peripheral surface of the preform forming roll and a forming stand incorporating a forming roll fitted into the concave portion, A press roll device is provided between the squeeze roll and the preforming stand to apply a press force for restricting the bending of the raw tube. Further, by using a roll provided with a caliber having a radius of curvature equal to or greater than the radius of the base tube as the press roll device, a stronger press force is applied.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the manufacture of a profiled pipe according to the present invention, an apparatus having a plurality of forming stands arranged in tandem is used. In this case, an apparatus having two stages of forming stands arranged (FIG. 2).
Now, an example of manufacturing a deformed pipe in which eight uneven patterns spiraled in the pipe axis direction are provided in the circumferential direction will be specifically described.
The forming apparatus according to the present invention is a method for forming a deformed pipe having a spiral uneven pattern with respect to the pipe axis direction at a forming stand after forming both ends of the open pipe-shaped metal band in the width direction by welding. It is to be incorporated into the tube-forming line to be molded.
As shown in FIG.
In addition, when a two-stage configuration of the forming stand 20 is used to form a spiral concave-convex pattern on the raw tube Po, the preforming stand 10 and the forming stand 20 are driven to rotate in accordance with the running of the raw tube Po.

The press roll device 30 is disposed in a section between the squeeze roll 1 and the preforming roll 10. Metal strip S
Is formed into an open pipe shape, and then squeeze roll 1 is used to butt both ends of the metal band S in the width direction to form a welding position W
Are welded by the welding torch T arranged at the end, and sent to the preforming stand 10 via the presser roll device 30 as the raw tube Po.

As shown in FIG. 4, the press roll device 30 comprises a press roll 31 for holding the raw tube Po, a box 32 for accommodating the roll, and a pressing screw 33 for adjusting the amount of roll reduction. The roll 31 is provided with a roll shaft 34 orthogonal to the tube axis direction of the raw tube Po and a box 3.
In 2, the amount of reduction of the press roll 31 with respect to the raw tube Po, which is rotatably supported, is adjusted by the amount of screwing of the reduction screw 33. When the presser roll 31 comes into contact with the raw tube Po, the presser roll 31 is driven to rotate in the running direction of the raw tube Po. A caliber having a curvature equal to or larger than the radius of the raw tube Po may be provided on the surface of the presser roll 31. The press roll 31 for pressing down the raw tube Po is arranged in parallel with the tube axis direction at the upper part of the raw tube. The amount of reduction of the presser roll 31 is the pipe Po
With the state of about 1 mm floating from the initial position, actual forming is performed, and the amount of reduction of the presser roll 31 is increased or decreased by fine adjustment while visually checking the bending of the raw tube Po, and occurs in the upper direction of the tube orthogonal to the tube axis direction. Get rid of the bend.

Squeeze roll 1 and preforming stand 10
Since the bending of the raw pipe Po can be restrained by the presser roll device 30 disposed between the squeeze roll 1 and the preforming stand 10, even if there is a welded portion wc between the squeeze roll 1 and the preforming stand 10, there is an unwelded portion wo therebetween. The bent portion B does not occur in the raw tube Po, and stable raw tube running becomes possible. Presser roll 31
Does not damage the raw tube Po because it rotates in the direction of travel of the raw tube Po. Furthermore, if a caliber having a radius of curvature equal to or larger than the radius of the raw tube Po is applied to the presser roll 31, the contact area with the raw tube Po increases, and the binding force can be increased.

The raw tube Po is preformed in the preforming stand 10 and then formed in the finish forming stand 20 into a deformed pipe P1 having a target shape. Between the preforming stand 10 and the finish forming stand 20, third and fourth forming stands may be further arranged. The preforming stand 10 is provided with four preforming rolls 11 to 14 arranged in the circumferential direction of the raw tube Po as shown in FIG. The preforming rolls 11 to 14 are arranged at a very small interval, and the roll axis of the raw tube Po is set at an angle equal to the inclination angle with respect to the tube axis direction of the spiral uneven pattern attached to the deformed tube P1 to be manufactured. It is inclined with respect to a plane perpendicular to the axis. On the peripheral surface of the preforming rolls 11 to 14, a number (eight in the case of FIG. 3) of projections 11p to 14p corresponding to the number of concaves on the peripheral surface of the target deformed pipe P1 to be manufactured is formed. ing. Eight concave portions d are formed in the raw tube Po by the convex portions 11p to 14p, but it is preferable that the joint of each preforming roll coincides with the boundary between the tube wall of the raw tube Po and the concave portion d.

As shown in FIG. 3 (b), the forming stand 20 is provided with a number (eight in the case of FIG. 3) of forming rolls corresponding to the number of concave portions of the deformed pipe P1 to be manufactured, as shown in FIG. They are arranged in the circumferential direction. The roll axis of each forming roll 21 is inclined with respect to a plane orthogonal to the tube axis of the raw tube Po at an angle equal to the inclination angle with respect to the tube axis direction of the spiral uneven pattern attached to the deformed tube Po to be manufactured, and adjacent to each other. Forming roll 2
1 are provided with a gap 22. Each forming roll 21
The preform stand 10 fits into the concave portion d attached to the raw tube Po.

The preforming roll 1 of the preforming stand 10
5 are instructed to be rotatable by a roll shaft 15 and a roll chock 16 as shown in FIG. Between the preforming rolls 11 to 14 and the roll chock 16,
A collar 17 for positioning the preforming rolls 11 to 14 is provided on the roll shaft 15. The roll chock 16 includes pre-formed rolls 11 to 14 toward the center of the raw tube Po.
A screw 18 for moving the screw is incorporated. The forming roll 21 of the forming stand 20 is also rotatably supported by a roll shaft 25 and a roll chock 26 as shown in FIG. A collar 27 for positioning the forming roll 21 is interposed between the forming roll 21 and the roll chock 26 on the roll shaft 25. Each of the forming rolls 2 is attached to the roll chock 26 toward the center of the raw tube Po.
A screw 28 for moving the screw 1 is incorporated.

As shown in FIG. 7, the roll chock 26 has a housing space 26a for housing the forming roll 21 and a shaft hole 26b into which the roll shaft 25 is inserted.
The accommodation space 26a and the shaft hole 26b are inclined at a helical angle θ in a direction perpendicular to the tube axis of the raw tube Po. In the roll chock 16 of the preforming stand 10 as well, the roll accommodation space and the shaft hole are inclined at the same spiral angle θ, but are not shown here.

When the raw tube Po is passed through the preforming stand 10, eight concave portions d are formed in the circumferential direction of the raw tube Po by the concave portions 11p to 14p of the preforming rolls 11 to 14. Since it is a two-stage configuration using the preforming stand 10 and the forming stand 20, the amount of deformation of the raw tube Po in each stage can be reduced, and the height difference of the concave portion provided by the preforming stand 10 can be small. Roll 11-
Since 14 is arranged without a gap, the positional relationship between the eight concave portions d does not shift. Further, when the joint of each of the pre-forming rolls 11 to 14 is made coincident with the boundary between the pipe wall of the raw tube Po and the concave portion d, the metal is prevented from flowing into the gap between the pre-forming rolls 11 to 14, and the shape is good. A specially shaped pipe is manufactured.

In the forming stand 20, the recess d formed in the raw tube Po in the preforming stand 10 is formed by forming rolls 21 and
21... Forming roll 2
1 is the number of concave portions of the deformed pipe P1 to be manufactured (FIG. 3).
In this case, the number is 8), and the adjacent forming rolls 21, 21
, A gap 22 is formed between the preforming stands 1
Since the deformation direction of the raw tube Po is determined to be 0, the cross-sectional shape does not largely collapse. Also, the forming rolls 21 and 21
Since the amount of change in each recess d can be adjusted by changing the amount of reduction for each..., The symmetry of the concavo-convex shape in the circumferential direction of the deformed pipe P1 can be excellently finished.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Steel tube STK having an outer diameter of 54 mm and a thickness of 1.6 mm
M13B is used as the raw tube Po, and the helical angle θ
= A deformed pipe P1 in which eight spiral rugged portions inclined at 5 degrees were circumferentially assembled was formed in-line by a pipe forming line for the raw pipe Po. The presser roll device 30 is disposed at the center in the section from the squeeze roll 1 to the preforming stand 10, and the presser roll 31 is positioned parallel to the pipe axis direction and at the top of the pipe so that the pipe Po can be lowered. Fixed. The presser roll 31 was provided with a caliber having a radius of curvature of 40 mm on the surface, and was roll-reduced so that the outer diameter was 133 mm and the width was 86 mm, and the gap formed between the presser roll and the top of the raw tube was 1 mm. In addition, four preforming rolls 11 to
The raw tube Po was formed by the pre-forming stand 10 provided with 14 and the forming stand provided with eight forming rolls.

As the preforming rolls 11 to 14, there were used rolls having an outer diameter of 180 mm and a width of 80 mm and having a total of eight convex portions 11p to 14p corresponding to the concave portions d to be attached to the raw tube Po on the peripheral surface. The protrusions 11p to 14p were set to a height of 4.6 mm. As the forming roll 21, the outer circumference 150
Eight rolls having a diameter of 20 mm, a width of 20 mm, and a tip radius of 2.5 mm were arranged at equal intervals in the circumferential direction of the raw tube Po. Under the pressure of the pre-forming rolls 11 to 14 of the pre-forming stand 10 and the forming rolls 21 of the forming stand 20, a spiral concave-convex pattern having a spiral angle θ = 5 ° was formed on the raw tube Po. At this time, the preforming stand 10 and the forming stand 20 were driven to rotate as the raw tube Po traveled. The obtained irregular-shaped tube P1 was provided with an uneven pattern having an outer diameter of 50.5 mm and a depth of 3 mm, and the symmetry of the uneven pattern was also good. Further, even if the pipe production is stopped halfway and then the pipe production is performed again,
The bent portion B did not occur in o, and the pipe Po could be run stably.

[0019]

Comparative Example Without using the presser roll device 30, the raw tube Po was passed through the preforming stand 10 and the forming stand 20, and a deformed tube P1 having a spiral uneven pattern was manufactured under the same conditions as in the example. In this case, when the raw tube is passed through the preforming stand 10 to form spiral irregularities, a bent portion B is formed in the section from the squeeze roll 1 to the preforming stand 10.
There has occurred. As a result, the pipe formation is temporarily stopped and the bent portion B
Was removed and the tube was formed again, and the production efficiency was significantly reduced.

[0020]

As described above, according to the present invention, in the case where a deformed pipe having a spiral uneven pattern in the pipe axis direction is formed, the pipe is stopped after being formed in the middle of the pipe forming, or the pipe is welded. There is a welded part between the squeeze roll and the preforming stand due to a defect, and the bending of the raw pipe generated by the presence of an unwelded part between them is restrained by the press roll device installed in this section, so that the raw pipe bending There is no need to rebuild the pipe after removing the part, and it has become possible to increase the production efficiency.

[Brief description of the drawings]

FIG. 1 is a view showing a state where an unwelded portion of a raw pipe is bent in a section of a forming stand from a welding machine in a conventional pipe forming apparatus.

FIG. 2 is a schematic view of the apparatus of the present invention in which a presser roll device is disposed in a section of a deformed pipe forming stand from a welding machine.

FIG. 3 is a diagram showing the roll configuration of a preforming stand (a) and a forming stand (b) as viewed from the tube axis direction.

FIG. 4 is a view of the presser roll device as viewed from the pipe axis direction.

FIG. 5 is an explanatory view of a mechanism for pressing a preforming roll against a raw tube.

FIG. 6 is an explanatory view of a mechanism for pressing a forming roll against a raw tube.

FIG. 7 is a sectional view of a forming roll incorporated in a roll chock inclined with respect to the pipe axis direction.

[Explanation of symbols]

 1: Squeeze roll 10: Pre-forming stand 11 to 14: Pre-forming roll 11p to 14p: Convex part 15: Roll shaft 16: Roll chock 17: Color 18: Screw down screw 20: Forming stand 21: Forming roll 22: Gap 25: Roll Shaft 26: Roll chock 26a: Housing space 26b: Shaft hole 27: Collar 28: Press-down screw 30: Press-down roll device 31: Press-down roll 32: Box 33: Press-down screw 34: Roll axis S: Metal strip Po: Raw tube P1: Deformed Pipe d: concave portion T: welding torch W: welding position B: bent portion wo: unwelded portion wc: welded portion θ: spiral angle of spiral uneven pattern

Continued on the front page (72) Inventor Takefumi Nakako 1 Tsurumachi, Amagasaki City, Hyogo Prefecture Inside Nisshin Steel Corporation Technical Research Institute (72) Inventor Hiroshi Asada 1 Tsurumachi Amagasaki City, Hyogo Prefecture Nisshin Steel Corporation Technical Research Institute F term (reference) 4E028 EA03 EA04 HA04

Claims (4)

[Claims] 1. An open pipe-shaped metal strip is welded at both ends in the width direction to form a raw pipe, and then a preformed stand and a forming stand are used to form a deformed pipe having a spiral uneven pattern in the pipe axis direction. A spiral uneven pattern characterized by applying a pressing force that restrains the bending of the raw tube between the squeeze roll and the preforming stand that abut the width direction both ends of the metal band at the time of forming the raw tube. In-line manufacturing method for deformed pipes 2. The deformed pipe having a helical uneven pattern according to claim 1, wherein the pressing force for restraining the bending of the raw pipe is provided by a pressing roll provided with a caliber having a radius of curvature equal to or larger than the radius of the raw pipe. In-line manufacturing method. 3. A squeeze roll for abutting the widthwise ends of an open pipe-shaped metal band at the time of forming a raw pipe, a torch for welding the metal band widthwise ends abutted by the squeeze roll, and a circle. A preforming stand incorporating a preforming roll for attaching a plurality of recesses to the peripheral surface of the base tube in the circumferential direction; a forming stand incorporating a forming roll fitted into the recess; and a section between the squeeze roll and the preforming stand. And a press roll device for restraining the bending of the base tube. 4. The in-line manufacturing apparatus for a deformed pipe having a helical uneven pattern according to claim 3, wherein the press roll apparatus is provided with a press roll having a caliber having a radius of curvature equal to or larger than the radius of the base pipe on the surface. .