JP2016185560A - Welded pipe manufacturing method and welded pipe manufacturing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welded pipe manufacturing method capable of minimizing deviation between a butting part of an open pipe and a welding position of a welder while avoiding the use of a seam guide.SOLUTION: A metal strip 2 is curved by a plurality of roller bodies while being conveyed along a prescribed line direction 1a to form an open pipe 2a, and a butting part of the open pipe 2a is welded by a welder 13 to form a welded pipe 3. On the downstream side of the welder 13, a take-off device 14 which holds the welded pipe 3 and imparts a conveyance force to the welded pipe 3 is arranged. On the upstream side of the take-off device 14, all roller bodies which are brought into contact with the metal strip 2, the open pipe 2a, or the welded pipe 3 are made to be non-driven.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a welded pipe manufacturing method and welded pipe manufacturing equipment for welding a butted portion of an open pipe to form a welded pipe.

  Examples of this type of welded pipe manufacturing method and welded pipe manufacturing equipment that have been used in the past include, for example, the configuration shown in Patent Document 1 below. That is, in the conventional method, a metal strip is curved by a plurality of roll bodies to form an open pipe, and a welded pipe is formed by welding the butted portion of the open pipe with a welding machine. The metal strip along the line direction is conveyed to the metal strip and the welded pipe by a roll body with a drive source (breakdown roll, etc.) arranged on the upstream side of the welding machine and a take-up device arranged on the downstream side of the welding machine. This is done by applying a conveying force.

Japanese Patent No. 2640541

  In the conventional welded pipe manufacturing method and welded pipe manufacturing equipment as described above, a conveying force is applied to the metal strip by the roll body arranged upstream of the welder and the take-up device arranged downstream of the welder. Therefore, the following problems arise.

  That is, the roll body arranged on the upstream side of the welder is configured to have a cross-sectional profile corresponding to the curvature of the metal strip so that the outer peripheral surface of the roll body is in close contact with the surface of the metal strip. However, it is difficult to perfectly match the cross-sectional profile of the roll body and the curvature of the metal strip, and there is a slight shift between the cross-sectional profile of the roll body and the curvature of the metal strip. When a conveyance force is applied to the metal strip by the roll body in which such a shift has occurred, a rotational force is generated in the metal strip or the like, and a shift occurs between the butted portion of the open pipe and the welding position of the welding machine. A deviation between the butt portion and the welding position causes poor welding.

  It is also conceivable to arrange a member called a seam guide immediately before the welder and correct the position of the butt portion with the seam guide. However, when the thickness of the metal band is thin, the seam guide may cause buckling at the butt portion.

  The present invention has been made to solve the above-described problems, and its purpose is to avoid the use of a seam guide while avoiding a deviation between the butt portion of the open pipe and the welding position of the welding machine. To provide a welded pipe manufacturing method and a welded pipe manufacturing facility that can be reduced.

  The welded pipe manufacturing method according to the present invention forms an open pipe by bending a metal strip with a plurality of roll bodies while conveying the metal strip along the line direction, and a butt portion of the open pipe is formed by a welding machine. A welded pipe manufacturing method including welding to form a welded pipe, wherein a take-up device that sandwiches the welded pipe and applies a conveying force to the welded pipe is disposed on the downstream side of the welder, and is upstream of the take-up apparatus. In this case, all the roll bodies that come into contact with the metal strip, the open pipe or the welded pipe are not driven.

  Moreover, the welded pipe manufacturing facility according to the present invention forms a welded pipe by welding a butt portion of an open pipe formed by bending a metal strip along a plurality of roll bodies while being conveyed along the line direction. A welding machine and a take-up device that is disposed on the downstream side of the welder and sandwiches the weld pipe and applies a conveying force to the weld pipe, and contacts the metal strip, the open pipe, or the weld pipe on the upstream side of the take-up apparatus. All roll bodies are non-driven.

  According to the welded pipe manufacturing method and the welded pipe manufacturing facility of the present invention, a conveying force is applied to the welded pipe by a take-up device arranged downstream of the welder, and a metal strip, an open pipe or a weld is provided upstream of the take-up device. Since all the roll bodies in contact with the pipe are not driven, the rotational force generated in the metal band or the like due to the roll body in contact with the metal band, the open pipe or the welded pipe can be reduced. Thereby, the shift | offset | difference between the butt | matching part of an open pipe and the welding position of a welding machine can be decreased, avoiding use of a seam guide.

It is explanatory drawing which shows the weld pipe manufacturing equipment with which the weld pipe manufacturing method by Embodiment 1 of this invention is implemented. It is a side view which shows another aspect of the taking over apparatus of FIG. FIG. 3 is a plan view of the take-up device of FIG. 2. It is a front view which shows the up-and-down roll contained in the forming roll group of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is an explanatory diagram showing a welded pipe manufacturing facility in which a welded pipe manufacturing method according to Embodiment 1 of the present invention is performed. In the figure, a welded tube manufacturing facility 1 is a facility for manufacturing a welded tube 3 from a metal strip 2. The metal band 2 is a metal band such as stainless steel or ordinary steel, and is wound around the payoff reel 4 in a coil shape. The metal band 2 is pulled out from the payoff reel 4 by a conveying force applied by a take-up device 14 described later and is conveyed along the line direction 1a.

  The welded pipe manufacturing facility 1 includes a forming roll group 10, a fin pass roll 11, a squeeze roll 12, a welding machine 13, a take-up device 14, a sizing roll group 15, and a straightening roll in order along the line direction 1a. A group 16 is provided.

  The forming roll group 10 includes a plurality of upper and lower rolls 10a and a plurality of left and right rolls 10b arranged on the downstream side of the payoff reel 4, and is formed by bending the metal strip 2 conveyed along the line direction 1a. It is for forming the open pipe 2a. Each of the upper and lower rolls 10a and the left and right rolls 10b is a pair roll constituted by a pair of roll bodies, and a metal band 2 is sandwiched along the vertical direction (plate thickness direction) and the left and right direction (plate width direction). The band 2 is bent. The open pipe 2a is obtained by bending the metal band 2 into a C-shaped cross section so that both ends of the metal band 2 in the plate width direction are abutted with each other.

  The fin pass roll 11 is disposed on the downstream side of the forming roll group 10 and is configured by a pair roll (a pair of roll bodies) that sandwich the open pipe 2a along the left-right direction. By passing the fin pass roll 11, the shape of the open pipe 2a is adjusted.

  The squeeze roll 12 is a pair roll that sandwiches the open pipe 2a along the left and right direction so as to close the opening of the open pipe 2a on the downstream side of the fin pass roll 11, that is, so as to abut both ends of the metal strip 2 in the plate width direction. A pair of roll bodies). The portion where both ends of the metal strip 2 in the plate width direction are abutted is called a butt portion.

  The welding machine 13 is arrange | positioned above the squeeze roll 12, and forms the welded pipe 3 by welding the butt | matching part of the open pipe 2a. As the welder 13, it is preferable to use a laser welder that welds the butt portion with laser light. This is because the region where the material metal of the welded pipe 3 is hardened by heat during welding is narrow. However, other welding machines such as a TIG welding machine can also be used as the welding machine 13.

  The take-up device 14 is disposed on the downstream side of the welding machine 13, and sandwiches the welded pipe 3 to apply a conveying force to the welded pipe 3. 1 is configured by a pair of endless belts 14a extending along the line direction 1a and spaced apart so as to sandwich the welded tube 3, and sandwiched the welded tube 3. In this state, the endless belt 14a is circulated and driven, so that a conveying force is applied to the welded pipe 3.

  The sizing roll group 15 is disposed on the downstream side of the take-up device 14. The sizing roll group 15 includes a plurality of pair rolls (a plurality of pairs of roll bodies) that sandwich the welded pipe 3, and adjusts the shape and size of the welded pipe 3 by drawing the welded pipe 3.

  The correction roll group 16 is disposed on the downstream side of the sizing roll group 15. The straightening roll group 16 corrects bending or the like in the longitudinal direction of the welded pipe 3.

  Here, in the welded pipe manufacturing facility of the present embodiment, all the roll bodies contacting the metal strip 2, the open pipe 2a, or the welded pipe 3 on the upstream side of the take-up device 14 are not driven. That is, all the roll bodies constituting the forming roll group 10, the fin pass roll 11, and the squeeze roll 12 are only rotatably provided and are not driven by a driving means such as a motor. For this reason, the rotational force which arises in the metal strip 2 etc. resulting from the roll body which comprises the forming roll group 10, the fin pass roll 11, and the squeeze roll 12 can be reduced, and the butt portion of the open pipe 2a and the welding position of the welding machine 13 Can be reduced. This configuration is particularly useful when a laser welding machine having a very narrow tolerance for welding position deviation is used as the welding machine 13.

  The roll bodies constituting the sizing roll group 15 and the correction roll group 16 arranged on the downstream side of the take-up device 14 are preferably set to non-drive, but may be driven. Even if some rotational force is generated in the welded pipe 3 by driving the roll body constituting the sizing roll group 15, the take-up device 14 disposed upstream of the sizing roll group 15 is connected to the welded pipe 3. It is because it is obstructed that a rotational force is transmitted to the position of the welding machine 13 by pinching. If the sizing roll group 15 and the correction roll group 16 are disposed upstream of the take-up device 14, the roll bodies constituting the sizing roll group 15 and the correction roll group 16 are not driven.

  2 is a side view showing another embodiment of the take-up device 14 of FIG. 1, and FIG. 3 is a plan view of the take-up device 14 of FIG. Although FIG. 1 shows the take-up device 14 that directly clamps the welded pipe 3 by the endless belt 14a, the take-up device 14 may have a configuration as shown in FIGS. The take-up device 14 shown in FIGS. 2 and 3 is provided with an endless belt 14a, a plurality of drive shafts 14b, and a plurality of chuck bodies 14c.

  The endless belt 14a extends along the line direction 1a and is circulated and driven by a driving means (not shown). The chuck body 14c is fixed to the endless belt 14a via the drive shaft 14b.

  The chuck bodies 14c are spaced apart from each other along the circulation direction of the endless belt 14a (see FIG. 2). Further, the chuck bodies 14c are arranged apart from each other along the radial direction of the welded pipe 3 (see FIG. 3). The drive shaft 14b is configured to be able to drive the chuck body 14c in a direction in which the chuck body 14c is brought closer to the welded pipe 3 and in a direction in which the chuck body 14c is moved away from the welded pipe 3.

  The chuck body 14c positioned above the endless belt 14a due to the circulation of the endless belt 14a is brought close to the welded tube 3 by the operation of the drive shaft 14b and sandwiches the welded tube 3. Then, the chuck body 14c holding the welded pipe 3 is displaced in the line direction 1a by the circulation of the endless belt 14a, whereby a conveying force is applied to the welded pipe 3. The chuck body 14c approaching the end of the endless belt 14a is moved away from the welded tube 3 by the operation of the drive shaft 14b to open the welded tube 3.

  Next, FIG. 4 is a front view showing the upper and lower rolls 10a included in the forming roll group 10 of FIG. In the figure, the upper and lower rolls 10a are provided with an upper roll body 20U and a lower roll body 20D (pair roll) that are spaced apart from each other along the vertical direction. The upper roll body 20U and the lower roll body 20D are supported by the stand 40 via the upper shaft body 30U and the lower shaft body 30D, respectively.

  The upper roll body 20U and the lower roll body 20D are rotatably attached to the upper shaft body 30U and the lower shaft body 30D via bearings 50. As a method of making the upper roll body 20U and the lower roll body 20D rotatable, the upper shaft body 30U and the lower shaft body 30D are inserted into the shaft holes of the upper roll body 20U and the lower roll body 20D, and by a bearing. A method of supporting the upper shaft body 30U and the lower shaft body 30D is also conceivable. However, when such a method is adopted, the backlash of the upper roll body 20U and the lower roll body 20D becomes larger than in the embodiment shown in FIG. Therefore, in the present embodiment, the upper roll body 20U and the lower roll body 20D are rotatably attached to the upper shaft body 30U and the lower shaft body 30D via the bearing 50, thereby causing the above-described rattling. The adverse effect on transportation is reduced.

  The upper shaft body 30U and the lower shaft body 30D are provided with an enlarged diameter portion 30b. A collar 60 having a predetermined length is attached along the axial direction 30a between the upper roll body 20U and the lower roll body 20D and the expanded diameter portion 30b. By changing the collar 60 to the collar 60 having another length, the positions of the upper roll body 20U and the lower roll body 20D along the axial direction 30a can be adjusted. The axial direction 30a is a direction orthogonal to the direction (vertical direction) in which the upper shaft body 30U and the lower shaft body 30D sandwich the metal band 2.

  The upper shaft body 30U is inserted into a shaft hole 410U provided in the upper shaft support portion 41U of the stand 40, and the lower shaft body 30D is inserted into a shaft hole 410D provided in the lower shaft support portion 41D of the stand 40. Has been. Screws are provided on the outer peripheral surface of the upper shaft body 30U and the inner peripheral surface of the shaft hole 410U, and screws are provided on the outer peripheral surface of the lower shaft body 30D and the inner peripheral surface of the shaft hole 410D. By rotating the upper shaft body 30U and the lower shaft body 30D, the upper shaft body 30U and the lower shaft body 30D are advanced and retracted along the axial direction 30a. The positions of the upper roll body 20U and the lower roll body 20D along the axial direction 30a can also be adjusted by the advancement and retreat of the upper shaft body 30U and the lower shaft body 30D.

  A ball screw 70 is connected to the upper shaft support portion 41U. When the ball screw 70 is rotationally driven by an actuator (not shown), the upper shaft support portion 41U is moved up and down, and the distance between the upper roll body 20U and the lower roll body 20D along the vertical direction is adjusted.

  In FIG. 4, the upper and lower rolls 10 a included in the forming roll group 10 of FIG. 1 have been described, but the left and right rolls 10 b, the fin pass roll 11, and the squeeze roll 12 of the forming roll group 10 of FIG. It is attached via a bearing. In addition, these roll bodies are also provided by shims, ball screws, or the like so that the position of each roll body can be adjusted along a direction orthogonal to the direction in which the metal strip 2, the open pipe 2a, or the welded tube 3 is sandwiched.

  In such a welded pipe manufacturing method and welded pipe manufacturing equipment, all the roll bodies that come into contact with the metal strip 2, the open pipe 2a or the welded pipe 3 on the upstream side of the take-up device 14 are undriven and the take-up device 14 uses the welded pipe. Since the conveying force is applied to 3, the rotational force generated in the metal band 2 or the like due to the roll body contacting the metal band 2, the open pipe 2a or the welded tube 3 can be reduced. Thereby, the shift | offset | difference between the butt | matching part of the open pipe 2a and the welding position of the welding machine 13 can be decreased, avoiding use of a seam guide. This configuration is particularly useful for an embodiment that uses a laser welding machine with a narrow tolerance between the butt portion and the welding position.

  Moreover, since the roll body is rotatably attached to the shaft body via the bearing, the rattling of the roll body with respect to the shaft body can be reduced. Thereby, it can avoid that a bad influence arises in conveyance of the metal strip 2 etc. by the shakiness of a roll body, and more reliably reduces the shift | offset | difference between the butting part of the open pipe 2a and the welding position of the welding machine 13. Can do.

  Furthermore, since the position of the roll body of the pair rolls such as the upper and lower rolls 10a can be adjusted along the direction orthogonal to the direction of sandwiching the open pipe 2a or the welded pipe 3, the metal strip 2 or the like can be adjusted depending on the position of the roll body. It is possible to avoid an adverse effect on the conveyance, and to reduce the deviation between the butt portion of the open pipe 2a and the welding position of the welding machine 13 more reliably.

DESCRIPTION OF SYMBOLS 1 Welded pipe manufacturing equipment 1a Line direction 2 Metal strip 2a Open pipe 3 Welded pipe 10 Forming roll group 10a Up-down roll (pair roll)
10b Left and right roll (pair roll)
11 Fin pass roll (pair roll)
12 Squeeze roll (pair roll)
13 Welding Machine 14 Take-up Device 15 Sizing Roll Group 16 Straightening Roll Group

Claims (5)

Forming an open pipe by curving the metal band with a plurality of roll bodies while conveying the metal band along the line direction, and welding a butt portion of the open pipe with a welding machine to form a welded pipe A welded pipe manufacturing method comprising:
A take-off device that sandwiches the welded pipe and applies a conveying force to the welded pipe is disposed on the downstream side of the welder,
All the roll bodies which contact the said metal strip, the said open pipe, or the said weld pipe in the upstream of the said take-off apparatus are made into non-drive | operation. The welded pipe manufacturing method according to claim 1, wherein the roll body is rotatably attached to the shaft body via a bearing. The roll body comprises a plurality of pair rolls that sandwich the metal strip, the open pipe or the welded pipe,
The position of the said roll body of the said pair roll is provided so that adjustment is possible along the direction orthogonal to the direction which clamps the said metal strip, the said open pipe, or the said welding pipe. The welded pipe manufacturing method according to 2. The said welder is a laser welder which welds the said butt | matching part with a laser beam. The welding pipe manufacturing method as described in any one of Claim 1- Claim 3 characterized by the above-mentioned. A welding machine that welds the butt portion of an open pipe formed by being bent by a plurality of roll bodies while being conveyed along the line direction to form a welded pipe;
A take-off device that is disposed on the downstream side of the welder and sandwiches the weld pipe and applies a conveying force to the weld pipe;
All the roll bodies which contact the said metal strip, the said open pipe, or the said welded pipe in the upstream of the said take-up apparatus are made non-driven. The welded pipe manufacturing equipment characterized by the above-mentioned.

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