JP2019217507A - Electric resistance welded steel tube welded part annealing device and manufacturing method of electric resistance welded steel tube using the same - Google Patents

Abstract

To provide an electric resistance welded steel tube welded part annealing device capable of stably performing an annealing treatment of a welded part in a process of manufacturing an electric resistance welded steel tube.SOLUTION: In the electric resistance welded steel tube welded part annealing device 6 according to the present embodiment, the position of the welded part WL at the position of the welded part heating device PA is determined, based on marking position information relating to the position of the marking detected by the marking position detection unit in the detection device DT and profile information relating to the position of a part of the external surface shape of the electric resistance welded steel tube 100 detected by the profile detection unit. Then, based on the obtained position of the welded part WL, the heating portion 10 is moved so that the heating part in the heating device PA is arranged on the welded part WL.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to an electric resistance welded steel pipe welded annealing apparatus and a method for manufacturing an electric resistance welded steel pipe using the same.

  The ERW steel pipe is manufactured by the following method. First, unwind the steel strip. The unwound steel strip is rolled in the width direction and formed to manufacture an open pipe. The open pipe has a pair of end faces extending in the longitudinal direction. By using a welding device, both ends of the open pipe are butted against each other and subjected to electric resistance welding to produce an ERW steel pipe having a welded portion extending in the longitudinal direction.

  The mechanical properties of the welded portion of the ERW steel pipe are lower than that of the base metal due to the heat effect during welding. Therefore, annealing treatment is performed on the welded portion of the ERW steel pipe after welding. The annealing treatment is performed using an electric resistance welded steel pipe welded annealing device (post-annealer). The electric resistance welded steel pipe welding part annealing device includes a plurality of welded part heating devices arranged in a line along the traveling direction of the electric resistance welded steel pipe. Each welding portion heating device heats a predetermined range (for example, 20 to 30 mm) in a direction (width direction) perpendicular to the longitudinal direction of the ERW steel pipe. The weld is annealed by continuously heating the weld in the longitudinal direction with a plurality of weld heaters.

  By the way, the ERW steel pipe on the transport line of the manufacturing equipment may be transported while rotating left and right (twisting left and right) as viewed from the axial direction of the ERW steel pipe. Therefore, the heating position of the welded portion heating device in the width direction of the ERW steel tube and the position of the welded portion may not coincide with each other at the arrangement position of each welded portion heating device of the ERW steel tube welded annealing device. For example, it is assumed that the ERW steel pipe passing through the ERW steel pipe welding annealing device rotates clockwise as viewed in the advancing direction as it advances in the advancing direction. In this case, even if the welded part is located at the top of the ERW steel pipe at the position of the leading welded heating device of the ERW steel pipe annealing equipment, the latter stage (downstream side) of the leading welded heating device In another arrangement position of the welding portion heating device arranged at the position, the welding portion is shifted from the top of the ERW steel pipe by a predetermined angle clockwise when viewed in the traveling direction. If the widthwise heating position of the subsequent welding unit heating device is the same as the widthwise heating position of the first welding unit heating device, if the displacement of the welded portion due to clockwise rotation is large, the welded portion will be heated at the subsequent stage. A case may occur where the temperature is out of the heating range of the device. In this case, stable annealing cannot be performed on the welded portion.

  Patent Document 1 proposes a technique for such displacement of the welded portion. In Patent Document 1, the position of a weld is detected by the following method. On the upstream side of the ERW pipe annealing apparatus in the ERW pipe manufacturing process, marking is continuously performed at a position at a predetermined angle in the circumferential direction from the weld on the ERW pipe. Then, this marking position is detected, and the position of the welded portion is specified. Based on the specified position of the welded portion, the position of the inductor (the heating portion of the welded portion heating device) of the electric resistance welded tube annealing device is corrected.

JP-A-59-187206

  However, even when the technique of Patent Literature 1 is adopted, the case where the heating part of the welding part heating device is still shifted from the welding part has occurred. If the welding portion heating device is displaced from the welding portion, as described above, the annealing process of the welding portion cannot be performed stably. Therefore, the annealing treatment of the weld may be insufficient.

  An object of the present invention is to provide an electric resistance welded steel pipe welded part annealing apparatus capable of stably performing an annealing treatment of a welded part in a production process of an electric resistance welded steel pipe, and an electric resistance welded steel pipe production method using the same. To provide.

  An electric resistance welded steel pipe welded annealing apparatus according to the present invention is an electric resistance welded steel pipe welded annealing apparatus for annealing a welded part of an electric resistance welded steel pipe, wherein a plurality of welds arranged in a line along a traveling direction of the electric resistance welded steel pipe. Part heating device, a marking device arranged upstream of the plurality of welded portion heating devices, for marking the outer surface of the ERW steel pipe progressing from upstream to downstream, and a plurality of arrangements arranged along the traveling direction of the ERW steel pipe And a control device for controlling the movement of the heating unit in the welding portion heating device based on the detection result of the detection device. The welding part heating device includes a heating part for heating the welded part of the ERW pipe, a drive mechanism for moving the heating part in the left-right direction perpendicular to the longitudinal direction of the ERW pipe, and disposing the heating part on the welded part. including. The detecting device includes a marking position detecting unit that detects a position of the marking on the ERW steel pipe at a position of the detecting device, and an outer shape of the ERW steel pipe at a cross section perpendicular to a longitudinal direction of the ERW steel tube at the position of the detecting device. And a profile detection unit that detects a part of the profile. An acquisition unit configured to acquire marking position information on a position of the marking detected by the marking position detection unit and profile information on a position of a part of the outer surface shape detected by the profile detection unit; and the acquired marking. Based on the position information and the profile information, at the position of the welding part heating device, based on the position of the welded part determined by the welded part position determining unit that determines the position of the welded part of the ERW steel pipe, And a drive mechanism control unit that controls the drive mechanism to move the heating unit such that the heating unit is disposed on the welded part.

  The method for manufacturing an electric resistance welded steel pipe according to the present invention includes a forming step of forming a tubular open pipe by rolling a steel strip in a width direction using a forming apparatus, and extending in a longitudinal direction of the open pipe, and facing each other. Welding the side edges arranged by electric resistance welding to form a welded portion, and an annealing process of performing an annealing process on the welded portion using the above-described ERW steel pipe welded portion annealing apparatus. And The annealing step includes a step of applying a marking to an outer surface of the ERW steel pipe being advanced from upstream to the downstream by a marking device, a step of detecting a position of the marking of the ERW steel pipe by a marking position detection unit of the detection device, and a detection step. A step of detecting a part of the outer surface shape of the ERW pipe in a cross section perpendicular to the longitudinal direction of the ERW pipe by the profile detection unit of the device, and marking position information on the position of the marking detected by the marking position detection unit. A step of acquiring profile information on a part of the position of the outer surface shape detected by the profile detection unit, and, based on the acquired marking position information and the profile information, at the position of the welding part heating device, the ERW steel pipe. Determining the position of the welded part, and driving the heating part on the welded part based on the determined position of the welded part. And a step of moving the heating unit by controlling the mechanism.

  INDUSTRIAL APPLICABILITY An electric resistance welded steel pipe welding part annealing apparatus and an electric resistance welded steel pipe manufacturing method using the same according to the present invention can stably perform an annealing treatment of a welded part in a process of producing an electric resistance welded steel pipe.

Drawing 1 is a figure for explaining annealing processing of the welding part of an electric resistance welded steel pipe using an electric resistance welded steel pipe welding part annealing device. FIG. 2 is a schematic view of a case where the ERW pipe is rotated rightward by a predetermined angle about the pass line (twisted to the right) in the annealing process of the welded part of the ERW pipe using the ERW pipe welding apparatus. It is. FIG. 3 is a schematic diagram showing a case where the ERW pipe is swung upward without rotating in an annealing process of a welded portion of the ERW pipe using the ERW pipe annealing apparatus. FIG. 4 is a schematic diagram showing a case where the ERW pipe is swung to the right without rotating in an annealing process of a welded part of the ERW pipe using the ERW pipe welding apparatus. FIG. 5 is a functional block diagram of the production line equipment for the ERW steel pipe in the present embodiment. FIG. 6 is a side view of the electric resistance welded steel pipe weld annealing apparatus in FIG. 5. FIG. 7 is a diagram showing the configuration of the welding portion heating device in FIG. FIG. 8 is a diagram showing a configuration of the detection device in FIG. FIG. 9 is a diagram showing a configuration of the control device in FIG. FIG. 10 is a diagram showing a hardware configuration of the control device in FIG. FIG. 11 is an operation flowchart of the electric resistance welded steel pipe weld annealing apparatus according to the present embodiment. FIG. 12 is a schematic diagram showing a cross section perpendicular to the axial direction of the ERW steel pipe at a position where the marking device performs marking according to the present embodiment. FIG. 13 is a schematic diagram for explaining a method for determining the position of the welded portion in the present embodiment. FIG. 14 is a side view of the electric resistance welded steel pipe weld annealing apparatus of the present embodiment, which is different from FIG. FIG. 15 is a schematic diagram for explaining the relationship between the degree of progress of the ERW pipe and the amount of movement of the welded part when the annealing process is performed using the ERW steel pipe welding part annealing apparatus shown in FIG. FIG. 16 is a side view of the electric resistance welded steel pipe weld annealing apparatus of the present embodiment, which is different from FIGS. 6 and 14. FIG. 17 is a side view of the electric resistance welded steel pipe weld annealing apparatus of the present embodiment, which is different from FIGS. 6, 14 and 16. FIG. 18 is a side view of the electric resistance welded steel pipe weld annealing apparatus of the present embodiment, which is different from FIGS. 6, 14, 16, and 17. FIG. 19 is a manufacturing flowchart of the electric resistance welded steel pipe in the present embodiment.

  Hereinafter, embodiments of the present invention will be described. In the drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated.

  During the annealing process of the welded portion of the ERW steel pipe using the conventional ERW welded pipe annealing apparatus, the inventors of the present invention adjust the position of the welded part heating device by detecting the marking position, and the welded part is heated. The cause of deviation from the heating range of the device was investigated. As a result, the following findings were obtained.

  FIG. 1 is a view for explaining an annealing process of a welded portion of an ERW steel pipe using a conventional ERW steel pipe welded annealing apparatus. FIG. The path line PL in the figure is the center of the ERW pipe 100 when the ERW pipe 100 having a cylindrical shape whose cross section is a perfect circle goes straight in the traveling direction without swinging in the left-right or up-down direction in FIG. This is a virtual line through which the axis C1 passes. In FIG. 1, the ERW steel pipe 100 advances from the front to the back of the drawing.

  Referring to FIG. 1, in a conventional technique, a marking MK is applied to a specific position on the outer surface (outer peripheral surface) of an ERW steel pipe 100 by using a marking device (not shown) upstream of the ERW steel pipe welding part annealing apparatus. In FIG. 1, the marking MK is provided at an outer surface position of 90 ° counterclockwise from the welded portion WL on the top of the ERW pipe 100, that is, at a position coinciding with the pass line PL in the vertical direction.

  In FIG. 1, the marking detector 500 detects the position of the marking MK on the outer surface of the ERW steel pipe 100. At this time, the marking detector 500, for example, captures an image of the area AR with a camera or the like to generate an image, and specifies the position of the marking MK in the vertical direction. On the basis of the specified marking MK position, the control device in the electric resistance welded steel tube welding portion annealing device adjusts the arrangement position of the heating portion 10 in the welding portion heating device PA. The heating unit 10 is a part that heats the weld WL, and is, for example, an inductor. As shown in FIG. 1, when the marking MK position in the vertical direction coincides with the pass line PL, the control device determines that the ERW pipe 100 is not rotating, and the center of the heating unit 10 determines that the ERW pipe 100 is true. The welding part heating device PA is arranged so as to be on the upper side.

  As shown in FIG. 2, it is assumed that the electric resistance welded steel pipe 100 rotates rightward by a predetermined angle about the pass line PL (twisted to the right). In this case, the marking MK position in the vertical direction rises upward by the distance D0 from the pass line PL position. The marking detector 500 detects the marking MK position in FIG. 2 and outputs information on the marking MK position to the control device. After acquiring the information on the marking MK position, the control device moves the position of the heating unit 10 in the left and right direction to the right by the movement amount (distance D0) of the marking MK position. Thereby, the heating unit 10 can follow the welding portion WL.

  However, during the annealing process of the welded portion WL, the ERW steel pipe 100 may not only rotate (twist) but also oscillate in the vertical or horizontal direction. When the ERW pipe 100 swings up and down or left and right, the following problem occurs.

  Referring to FIG. 3, it is assumed that the electric resistance welded steel pipe 100 swings (moves) upward by a distance D0 without rotating (twisting). In this case, the central axis C1 of the electric resistance welded steel pipe 100 rises by a distance D0 from the pass line PL. Therefore, the position of the marking MK also increases by the distance D0. The marking detector 500 detects the marking MK position in the vertical direction, and the control device detects that the marking MK position has risen by the distance D0. In this case, since the control device determines that the ERW pipe 100 has rotated to the right by the distance D0, the heating unit 10 is moved by the distance D0 even though the welding portion WL is located immediately above the pass line PL. Move to the right. As a result, there is a case where the heating unit 10 is displaced from above the welding portion WL and the welding portion WL is not annealed.

  Similarly, referring to FIG. 4, it is assumed that ERW pipe 100 swings (moves) rightward by distance D0 without rotation (twist). In this case, the weld WL moves rightward by the distance D0. However, the marking MK position detected by the marking detector 500 is the same as in FIG. Therefore, the control device determines that the ERW steel pipe 100 is not rotating and the position of the marking MK has not changed from the state of FIG. 1, and does not move the heating unit 10. As a result, there is a case where the heating unit 10 is displaced from above the welding portion WL and the welding portion WL is not annealed.

  As described above, when the position of the welded portion WL is specified by detecting the position of the marking MK, the rotation phenomenon (twist phenomenon: FIG. 2) of the ERW pipe 100 can be dealt with, but the vertical direction of the ERW pipe 100 itself can be dealt with. It cannot cope with the shake phenomenon (FIG. 3) or the shake phenomenon in the horizontal direction (FIG. 4).

  Based on the above-described examination results, the present inventors examined a method that can cope with not only the rotation phenomenon of the ERW steel pipe but also the swing phenomenon in the vertical and horizontal directions. As a result, if the marking position is detected by the marking detection and the outer surface shape of a part of the ERW pipe is detected by the profile detection, not only the rotation phenomenon of the ERW pipe, but also the vertical and horizontal deflection Therefore, it was considered that the movement amount of the welded portion WL could be predicted.

  An electric resistance welded steel pipe welded annealing apparatus according to the present invention completed based on the above technical idea is an electric resistance welded steel pipe welded annealing apparatus for performing an annealing treatment on a welded part of an electric resistance welded steel pipe, and is provided along a traveling direction of the electric resistance welded steel pipe. A plurality of welding portion heating devices arranged in a row, a marking device arranged upstream of the plurality of welding portion heating devices, and for marking the outer surface of the ERW steel pipe progressing from upstream to downstream; and The apparatus includes a plurality of detection devices arranged along the traveling direction, and a control device that controls movement of a heating unit in the welding portion heating device based on a detection result of the detection device. The welding part heating device includes a heating part for heating the welded part of the ERW pipe, a drive mechanism for moving the heating part in the left-right direction perpendicular to the longitudinal direction of the ERW pipe, and disposing the heating part on the welded part. including. The detecting device includes a marking position detecting unit that detects a position of the marking on the ERW steel pipe at a position of the detecting device, and an outer shape of the ERW steel pipe at a cross section perpendicular to a longitudinal direction of the ERW steel tube at the position of the detecting device. And a profile detection unit that detects a part of the profile. An acquisition unit configured to acquire marking position information on a position of the marking detected by the marking position detection unit and profile information on a position of a part of the outer surface shape detected by the profile detection unit; and the acquired marking. Based on the position information and the profile information, at the position of the welding part heating device, based on the position of the welded part determined by the welded part position determining unit that determines the position of the welded part of the ERW steel pipe, And a drive mechanism control unit that controls the drive mechanism to move the heating unit such that the heating unit is disposed on the welded part.

  Here, the driving mechanism moves the heating unit in the left-right direction perpendicular to the longitudinal direction of the ERW steel pipe, and does not have to be strictly perpendicular to the longitudinal direction. This includes the case where the angle is shifted by about 10 °. In addition, the drive mechanism moves the heating unit in the left-right direction perpendicular to the longitudinal direction of the ERW pipe, and when the drive mechanism moves in the left-right direction perpendicular to the longitudinal direction of the ERW pipe, the horizontal direction and the vertical direction , And also includes a case of moving along a circumferential direction perpendicular to the longitudinal direction of the ERW steel pipe.

  Further, the part of the outer surface shape means at least a part of the outer surface shape of the ERW steel pipe. Therefore, the profile detection unit may detect the entire outer surface shape of the ERW steel pipe.

  The electric resistance welded steel tube welding part annealing apparatus according to the present embodiment obtains the position of the welding part in the arrangement position of the welding part heating device based on the marking position information and the profile information. Therefore, the position of the welded portion can be obtained not only in response to the rotation phenomenon of the ERW steel pipe, but also in response to the vertical and horizontal deflection phenomenon. As a result, even if the ERW pipe during the annealing process rotates or swings up, down, left, and right, the heating section in the welding section heating device can be arranged on the welding section. Therefore, a stable annealing process can be performed.

  In the above-described electric resistance welded steel tube welded annealing apparatus, the plurality of detection devices are, among the plurality of welded portion heating devices, a first detection device arranged on an entrance side of a welded portion heating device arranged at the most upstream side of the transport line. And a second detection device arranged on the outlet side of the welding portion heating device arranged most downstream among the plurality of welding portion heating devices.

  In this case, the positions of the welded portions in the plurality of welded portion heating devices disposed between the first and second detection devices can be obtained.

  In the above described electric resistance welded steel tube annealing device, the obtaining unit may obtain the marking position information and the profile information of the adjacent detecting devices. In this case, the weld position determining unit obtains the position of the weld of the ERW steel pipe at the position of the weld heating device based on the marking position information and the profile information of the adjacent detection devices.

  In this case, since the welding position is obtained based on the marking position information and the profile information obtained by the adjacent detection devices, the prediction accuracy of the welding position is improved.

  In the above-described ERW steel pipe welded part annealing apparatus, the welded part position determining unit is configured to determine the left-right direction of the ERW steel pipe itself from the preceding detection device to the subsequent detection device based on a plurality of pieces of profile information from the adjacent detection devices. The amount of movement of the weld in the left-right direction due to the rotation of the ERW pipe from the preceding detection device to the subsequent detection device based on the plurality of profile information and the plurality of marking position information May be requested. In this case, the welding of the ERW steel pipe at the position of the welding portion heating device is performed based on the amount of lateral movement of the ERW steel pipe itself and the amount of lateral movement of the welding part due to the rotation of the ERW steel pipe. Find the position of the part.

  In this case, based on the marking position information and profile information of the preceding and subsequent detecting devices, the left-right movement amount of the ERW pipe itself, and the left-right movement amount of the welded portion due to the rotation of the ERW pipe are calculated. The position of the weld can be determined in consideration of the rotation of the ERW steel pipe and the runout in the vertical and horizontal directions.

  In the above-described electric resistance welded steel pipe annealing device, when the electric resistance welded steel pipe welded annealing device is viewed from a side surface, a detection device may be arranged between the adjacent welded portion heating devices.

  In the above-described electric resistance welded steel pipe annealing device, when the electric resistance welded steel pipe annealing device is viewed from the side, a guide roll for gripping the electric resistance welded steel pipe may be further provided between the adjacent welded portion heating devices.

  In this case, the rotation (torsion) of the ERW pipe can be suppressed by gripping the ERW pipe with the guide roll.

  In the above described electric resistance welded steel tube annealing device, a detection device may be provided on the entrance side or the exit side of the guide roll.

  The method for manufacturing an ERW steel pipe according to the present embodiment includes a forming step of forming a tubular open pipe by rolling a steel strip in a width direction by using a forming apparatus, and extending in the longitudinal direction of the open pipe, and A welding step of welding the side edges arranged to face each other by electric resistance welding to form a welded portion, and an annealing process of performing an annealing process on the welded portion using the above-described ERW steel pipe welded portion annealing apparatus. And a step. The annealing step includes a step of applying a marking to an outer surface of the ERW steel pipe being advanced from upstream to the downstream by a marking device, a step of detecting a position of the marking of the ERW steel pipe by a marking position detection unit of the detection device, and a detection step. A step of detecting a part of the outer surface shape of the ERW pipe in a cross section perpendicular to the longitudinal direction of the ERW pipe by the profile detection unit of the device, and marking position information on the position of the marking detected by the marking position detection unit. A step of acquiring profile information on a part of the position of the outer surface shape detected by the profile detection unit, and, based on the acquired marking position information and the profile information, at the position of the welding part heating device, the ERW steel pipe. Determining the position of the welded part, and driving the heating part on the welded part based on the determined position of the welded part. And a step of moving the heating unit by controlling the mechanism.

  In the method for manufacturing an electric resistance welded steel pipe according to the present embodiment, the position of the welded portion at the position of the welded portion heating device is obtained based on the marking position information and the profile information. Therefore, the position of the welded portion can be obtained not only in response to the rotation phenomenon of the ERW steel pipe, but also in response to the vertical and horizontal deflection phenomenon. As a result, even if the ERW pipe during the annealing process rotates or swings up, down, left, and right, the heating section in the welding section heating device can be arranged on the welding section. Therefore, a stable annealing process can be performed.

[About ERW steel pipe production line equipment]
First, the production line equipment for ERW steel pipes will be described. FIG. 5 is a diagram showing an example of the production line equipment for ERW steel pipes. Referring to FIG. 5, the ERW steel pipe manufacturing line equipment includes, in order from the upstream to the downstream, an uncoiler 1, a shear 2, a forming device 3, a welding device 4, a bead cutting device 5, an ERW steel pipe welded annealing device. 6 and a shaper 7.

  The uncoiler 1 continuously rewinds a steel strip (coil). The shear 2 cuts off a defective shape portion at the tip of the coil. The forming device 3 includes a plurality of roll groups arranged in a line. The forming device 3 forms the steel strip into a cylindrical open pipe by rolling in the width direction. The welding device 4 heats and melts both end faces extending in the longitudinal direction of the open pipe, and presses and welds the heat-melted both end faces (electric resistance welding). Through the above steps, an electric resistance welded steel pipe (raw pipe) is manufactured. The bead cutting device 5 cuts the weld bead on the outer surface and the inner surface of the welded ERW pipe. Then, the electric resistance welded steel pipe weld annealing device (post-annealer) 6 performs an annealing process on the welded part of the electric resistance welded steel pipe. The shaper 7 includes a plurality of roll groups arranged in a line. The shaper 7 is, for example, a sizer. The shaper 7 forms an ERW steel pipe having a welded portion annealed to a predetermined outer diameter. Through the above steps, an ERW steel pipe is manufactured. In addition, a straightening machine for straightening the ERW steel pipe may be arranged downstream of the shaping machine 7. Other equipment may be arranged between each equipment 1-7.

[Configuration of ERW Steel Pipe Welding Annealing Apparatus 6]
FIG. 6 is a side view of the electric resistance welded steel pipe weld annealing apparatus 6 in FIG. 5. Referring to FIG. 6, the electric resistance welded steel tube welding portion annealing device 6 includes a plurality of heating devices PAi (i = 1 to n, n is an integer), a marking device 61, a transport path 62, a control device 65, A plurality of detection devices DTk (k is a natural number; DT1 and DT2 in FIG. 1) are provided. The transport path 62 transports the ERW steel pipe 100 from upstream to downstream along the pass line PL. The transport path 62 is, for example, transport rollers arranged in a line.

[About heating device PAi]
The plurality of heating devices PAi are arranged in a line from upstream to downstream of the transport line (along the traveling direction of the ERW steel pipe 100). The plurality of heating devices PAi are also arranged above ERW pipe 100 during the annealing process. FIG. 7 is a view of the heating device PAi as viewed in the traveling direction of the ERW pipe 100. Referring to FIG. 7, heating device PAi includes a heating unit 10 and a driving mechanism 11. The heating unit 10 is a so-called inductor (heating coil). A weld WL of the ERW pipe 100 is arranged below the heating unit 10. The heating unit 10 heats and anneals the welded portion WL of the electric resistance welded steel pipe 100. The drive mechanism 11 moves the heating unit 10 in the left-right direction perpendicular to the longitudinal direction of the ERW pipe 100 under the control of the control device 65. At this time, the drive mechanism 11 may move the heating unit 10 in the circumferential direction of the ERW steel pipe 100. The drive mechanism 11 of each heating device PAi can move the heating unit 10 independently and independently of the other heating devices PAi.

[About marking device 61]
The marking device 61 is disposed downstream of the welding device 4 and upstream of the heating device PAi. The marking device 61 is located at a position separated by a predetermined angle from the welded portion WL on the outer surface of the electric resistance welded ERW pipe 100 (for example, when the welded portion WL is located on the top, when the welding portion WL is viewed from the forward direction, Marking MK is applied at a position (90 ° counterclockwise).

[About the detection device DTk]
FIG. 8 is a functional block diagram illustrating a configuration of the detection device DTk (k is a natural number). Referring to FIG. 8, detection device DTk includes a marking position detection unit MD and a profile detection unit PD.

  The marking position detection unit MD detects the position of the marking MK applied to the outer surface of the ERW pipe 100 when the ERW pipe 100 is viewed from the side (the direction perpendicular to the longitudinal direction of the ERW pipe 100). In this example, the marking position detection unit MD detects the marking MK position in the vertical direction. The marking position detection unit MD includes, for example, a camera. An image including the marking MK is generated by photographing the outer surface of the ERW pipe 100 with a camera. In this case, the image information including the marking MK corresponds to the marking position information.

  The profile detection unit PD detects at least a part of the outer surface shape in a cross section perpendicular to the longitudinal direction of the ERW pipe 100 when the ERW pipe 100 is viewed from the side. At this time, the profile detection unit PD specifies, for example, each point on the outer surface shape by a distance and an angle from the profile detection unit PD to each point. The distance and angle information to each point on the detected outer surface shape corresponds to the profile information. The profile detection unit PD is, for example, a known two-dimensional laser distance meter.

  The marking position detection unit MD and the profile detection unit PD may be arranged side by side in the vertical direction or may be arranged side by side in the traveling direction. The arrangement method of the marking position detection unit MD and the profile detection unit PD is not particularly limited.

  Returning to FIG. 6, the detection device DT1 is disposed on the entrance side (upstream side) of the heating device PA1 disposed on the most upstream side of the transport line. The detection device DT2 is arranged on the outlet side (downstream side) of the heating device PAn arranged at the most downstream side.

[Control device 65]
The control device 65 receives the detection results of the plurality of detection devices DTk, and moves the heating unit 10 in the heating device PAi in the left-right direction based on the detection results. FIG. 9 is a functional block diagram of the control device 65. The control device 65 includes an acquisition unit 651, a welding position determination unit 652, and a drive mechanism control unit 653.

  The obtaining unit 651 obtains marking position information from the marking position detecting unit MD of each detecting device DTk, and obtains profile information from the profile detecting unit PD of each detecting device DTk.

  Based on the marking position information and the profile information, the weld position determination unit 652 determines the position of the weld WL in the cross section (a surface perpendicular to the longitudinal direction of the ERW pipe 100) of the ERW steel pipe 100 in each heating device PAi. Find the position (movement amount).

  The drive mechanism control unit 653 drives the heating unit 10 of each heating device PAi based on the position (movement amount) of the welding portion WL obtained by the welding position determination unit 652 such that the heating unit 10 is disposed on the welding portion WL. The mechanism 11 is controlled. Specifically, the drive mechanism control unit 653 obtains the amount of movement of the heating unit 10 based on the welding part WL position obtained by the welding part position determining unit 652. Then, it instructs the driving mechanism 11 to move the heating unit 10 by the obtained moving amount. The drive mechanism 11 moves the heating unit 10 according to an instruction from the drive mechanism control unit 653.

  FIG. 10 is a block diagram illustrating a hardware configuration of the control device 65. Referring to FIG. 10, control device 65 includes a processor 655, a memory 656, an interface 657, and a hard disk 658. These components are connected to each other by a bus. The hard disk 658 stores a control program. The configuration shown in FIG. 9 is realized by loading the control program into the memory 656 and causing the processor 655 to execute the control program.

[Operation of ERW Steel Pipe Weld Annealing Device 6]
The operation of the electric resistance welded steel pipe welding annealing apparatus 6 having the above-described configuration will be described. FIG. 11 is an operation flow chart of the electric resistance welded steel pipe weld annealing apparatus 6 according to the present embodiment. Referring to FIG. 6, when the tip portion of ERW steel pipe 100 passes through marking device 61 when ERW steel pipe welded portion annealing device 6 is viewed from the side, marking device 61 is attached to outer surface of ERW steel tube 100. Is subjected to marking MK. In this example, the marking device 61 is positioned at the same height as the pass line PL (that is, when the welded portion WL is located on the top, a position that is 90 ° counterclockwise from the welded portion WL when viewed in the traveling direction). Is subjected to marking MK (S31).

  FIG. 12 is a schematic diagram showing a cross section perpendicular to the axial direction of the ERW steel pipe 100 at a position where the marking device 61 has performed the marking MK. FIG. 12 is a reference position for determining the position of the welded portion WL at each detection device DTk position. In this example, at the reference position, the central axis C1 of the ERW pipe 100 coincides with the pass line PL, and the welded portion WL is located at the top P0 (directly above the central axis C1). The control device 65 determines the marking MK position at the reference position and the outer surface shape of the ERW pipe 100 based on the position information of the marking device 61 and the size information of the ERW pipe 100. The position information of the marking device 61 and the size information of the electric resistance welded steel pipe 100 are stored in the hard disk 658 in the control device 65 in advance, for example.

  Subsequently, when the ERW pipe 100 passes through the detecting device DT1, the position of the weld WL of the ERW pipe 100 at the position of the detecting device DT1 in the traveling direction is determined using the marking position information and the profile information (S32). ).

  FIG. 13 is a schematic diagram for explaining a method of determining the position of the weld WL. In FIG. 13, it is assumed that the ERW pipe 100 is rotating rightward and swinging rightward.

  In this case, the marking position detection unit MD of the detection device DT1 detects the marking MK position and generates marking position information. Similarly, the profile detection unit PD generates profile information on the position of the outer surface shape of the ERW steel pipe 100 in the area AR.

  The acquisition unit 651 in the control device 65 acquires marking position information and profile information. The weld position determination unit 652 determines the position of the weld WL in the detection device DT1 using the marking position information and the profile information. Specifically, it is as follows.

  The weld position determination unit 652 determines the amount of change in the marking MK position from the marking device 61 to the detection device DT1, based on the marking position information. The weld position determination unit 652 further calculates the vertical and horizontal movement amounts of the ERW pipe 100 itself based on the profile information.

  The weld position determination unit 652 determines the amount of movement (the amount of rotation) of the weld WL in the ERW pipe 100 between the marking device 61 and the detection device DT1 by using the amount of change in the marking MK position and the vertical direction of the profile information. It is obtained from the difference of the movement amount (shake amount). Then, the sum of the left-right movement amount of the ERW pipe 100 itself and the movement amount (rotation amount) of the weld WL in the ERW pipe 100 is determined as the weld movement amount L01 in the detection device DT1. .

  Next, the position of the weld WL of the ERW pipe 100 detected by the detection device DT2 is determined. The welding position determination unit 652 in the control device 65 determines the position of the detection device DT2 based on the marking position information and the profile information from the detection device DT2, similarly to the determination of the welding movement amount L01 at the position of the detection device DT1. The movement amount L02 of the welding portion at the position is determined.

  The weld position determination unit 652 further determines the amount of movement of the heating unit 10 in each of the heating devices PA1 to PAn based on the amount of movement L01 and L02 of the weld. Specifically, the welded portion position determination unit 652 determines information (hereinafter, referred to as a positional relationship) between the detection device DTk (k = 1, 2) and each heating device PAi (i = 1 to n) in the traveling direction (Z axis). , Arrangement information) and the movement distances L01 and L02 of the welding parts, the movement distance of the welding part WL at the position of each heating device PAi is obtained. For example, the movement amount of the welding portion WL at the position of each heating device PAi can be obtained by linear approximation using the positional relationship between each heating device PAi and the detection device DTk and the welding portion movement amounts L01 and L02. . Note that the arrangement information is stored in advance on the hard disk 658 in the control device 65, for example.

  According to the above method, the control device 65 determines, based on the marking position information and the profile information of each of the detecting devices DT1 to DT2 in the marking device 61, the welding portion WL caused by the rotation of the ERW steel tube 100 and the deflection in the vertical and horizontal directions. Can be obtained, and the heating unit 10 of each heating device PAi is moved over the welding portion WL according to the moving amount of the welding portion WL between the adjacent detection devices DT1 and DT2 (S33 in FIG. 11). ). Then, the welding part WL is subjected to an annealing process using the plurality of heating devices PAi.

  According to the above method, the electric resistance welded steel tube welding portion annealing apparatus 6 of the present embodiment can stably perform the annealing process on the welding portion WL.

  In the electric resistance welded steel tube welded annealing device 6 in the above-described embodiment, two detection devices DT are arranged. However, if there are a plurality of detection devices DTk, two or more detection devices DTk may be arranged. For example, as shown in FIG. 14, the detection device DTk (k = 2 in FIG. 14) may be arranged between the adjacent heating devices PAi-1 and PAi (i = 2 to 6 in FIG. 14).

  In FIG. 14, three detection devices DT1 to DT3 are arranged. Therefore, the control device 65 obtains the welding portion movement amounts L01 and L02 in the detection devices DT1 and DT2 based on the marking position information and the profile information acquired from the adjacent detection devices DT1 and DT2. Then, based on the determined weld movement amounts L01 and L02 and the arrangement information on the positional relationship between the detection device DTk and each heating device PAi in the traveling direction, the position of each heating device PAi (i = 1 to 4) is calculated. Of the welded portion WL is determined.

  The control device 65 further obtains the welding portion movement amount L02 in the detection device DT2 based on the marking position information obtained from the adjacent detection devices DT2 and DT3 and the profile information, and further obtains the welding portion in the detection device DT3. The movement amount L03 is obtained.

  Then, on the basis of the obtained weld movement distances L02 and L03 and the arrangement information on the positional relationship between the detection device DTk and each heating device PAi in the traveling direction, the welding portion WL at the position of each of the heating devices PA5 and PA6 is determined. Find the amount of movement.

  Control device 65 moves heating unit 10 of each heating device PAi based on the movement amount of welding portion WL in each heating device PAi, and anneals welding portion WL.

  FIG. 15 shows the amount of movement of the heating unit 10 of each of the heating devices PA1 to PA6 according to the progress of the electric resistance welded steel pipe 100 when the annealing process is performed using the electric resistance welded steel pipe welded annealing device 6 shown in FIG. It is a schematic diagram for demonstrating. Referring to FIG. 15, when the distal end portion of ERW steel pipe 100 passes through detection device DT1 in STEP1, control device 65 controls detection device DT1 based on the marking position information and the profile information obtained from detection device DT1. Of the welding portion L01 is determined.

  Based on the obtained welding portion movement amount L01 in the detection device DT1 and the arrangement information, the welding portion movement amount L1 of the heating unit 10 in the heating device PA1 is obtained. However, in STEP1 and STEP2, the electric resistance welded steel pipe 100 passes through the detection device DT1, but does not pass through the detection device DT2. Then, control device 65 moves heating portion 10 of heating device PA1 with obtained welding portion movement amount L01 as welding portion movement amount L1, and also heats welding portion 10 of other heating devices PA2 to PA6. It moves by the movement amount L01.

  When the electric resistance welded steel pipe 100 is passing through the detecting devices DT1 and DT2 in STEP3 and STEP4, the control device 65 acquires the marking position information and the profile information from the detecting devices DT1 and DT2, and the welding portion in the detecting device DT1. The movement amount L01 and the welding portion movement amount L02 are obtained. Then, linear approximation is performed based on the obtained weld movement amounts L01 and L02 and the arrangement information, and the weld movement amounts L1 to L6 of the heating unit 10 in each of the heating devices PA1 to PA6 are determined. Then, the control device 65 controls the drive mechanism 11 in each of the heating devices PA1 to PA6 to move the heating unit 10 by the welding portion movement amounts L1 to L6.

  Further, as shown in STEP5, when the tip of the ERW pipe 100 proceeds downstream and the ERW pipe 100 passes through the detection devices DT1, DT2, and DT3, the control device 65 sets the welding portions in the detection devices DT1, DT2, and DT3. The movement amounts L01, L02, and L03 are obtained from the marking position information and the profile information of the detection devices DT1, DT2, and DT3. Then, linear approximation is performed based on the obtained welding portion movement amounts L01 and L02 and the arrangement information, and the welding portion movement amounts L1 to L4 of the heating unit 10 in each of the heating devices PA1 to PA4 are determined. Linear approximation is performed based on the obtained welded part movement amounts L02 and L03 and the arrangement information, and the welded part movement amounts L5 to L6 of the heating unit 10 in each of the heating devices PA5 to PA6 are determined. Then, the control device 65 controls the drive mechanism 11 in each of the heating devices PA1 to PA6 to move the heating unit 10 by the welding portion movement amounts L1 to L6.

  As shown in STEP 6, when the rear end of the electric resistance welded steel pipe 100 passes through the detecting device DT1, the control device 65 cannot obtain the marking position information and the profile information from the detecting device DT1. In this case, the control device 65 maintains the position of the heating unit 10 of the heating devices PA1 to PA4 between the detection devices DT1 and DT2 set in STEP5 without changing. Then, for the heating units 10 of the heating devices PA5 and PA6 between the detection devices DT2 and DT3, the welding portion movement amounts L02 and L03 are obtained based on the marking position information and the profile information of the detection devices DT2 and DT3, and the obtained welding is performed. Based on the unit movement amounts L02 and L03 and the arrangement information, linear approximation is performed, the movement amounts L5 and L6 of the heating unit 10 in each of the heating devices PA5 and PA6 are determined, and the heating unit 10 is moved.

  As shown in STEP 7, when the rear end of the electric resistance welded steel pipe 100 passes through the detecting device DT2, the control device 65 cannot obtain the marking position information and the profile information from the detecting device DT2. In this case, the control device 65 maintains the positions of the heating units 10 of the heating devices PA5 and PA6 between the detection devices DT2 and DT3 set in STEP6 without changing them.

  According to the above-described method, the electric resistance welded steel pipe welded annealing device 6 uses the marking position information and the profile information of the plural detection devices DTk and DTk + 1 while the electric resistance welded steel pipe 100 is moving across the plural detection devices DTk. Thus, the position of the heating unit 10 of each heating device PAi can be corrected so as to be on the welded portion WL.

  In FIG. 14, the electric resistance welded steel pipe annealing device 6 has three detection devices DT1 to DT3 arranged therein. However, as shown in FIG. 16, the detection devices DTk are arranged between the adjacent heating devices PAi. Is also good.

  While the ERW pipe 100 is passing through the detecting device DTk, the control device 65 acquires the marking position information and the profile information from the detecting device DTk at predetermined time intervals, and obtains the welded portion movement amount L0k at predetermined time intervals. Then, the heating unit 10 is moved. Accordingly, even if the position of the welded portion WL changes continuously due to the rotation of the ERW steel tube 100 and the runout in the vertical and horizontal directions, the heating portion 10 can be made to continuously follow.

  Further, as shown in FIG. 17, the electric resistance welded steel tube welded annealing device 6 may further include a guide roll stand 66 between the adjacent heating devices PAi and PAi + 1. At this time, preferably, the detection device DTk is arranged on the entrance side of the guide roll stand 66. The guide roll stand 66 includes a plurality of guide rolls arranged around the pass line PL. The guide roll stand 66 advances the ERW pipe 100 forward (downstream direction) while holding the ERW pipe 100 with a plurality of guide rolls. In this case, the torsion (rotation) of the ERW pipe 100 can be suppressed.

  When there is a possibility that the ERW steel pipe is rotated from the heating device to the marking device, the ERW steel tube welded annealing device 6 further attaches the welded position detection device 601 to the position of the marking device 61 as shown in FIG. May be provided. The position of the welding position detection device 601 is optimally the same as the position of the marking device 61 in the traveling direction of the ERW steel pipe 100. However, the position of the marking device 61 may be the entrance or the exit. Including location. The weld position detection device 601 detects the position of the weld WL with respect to the position of the marking MK. For example, the weld position detection device 601 measures the position of the bead cut portion obtained by cutting the weld portion WL after the electric resistance welding by light irradiation and a camera, and determines the center position in the width direction of the bead cut portion by the weld portion WL. Is determined, and the amount of deviation from the top of the ERW steel pipe, which is the ERW weld, is generated as position information (weld position information) of the weld WL with respect to the marking MK position. The control device 65 obtains welding position information from the welding position detection device 601 provided at the position of the marking device 61. The weld position determination unit 652 obtains the weld movement amount L01 'based on the weld position information, the marking position information and the profile information transmitted from the detection device DT1.

[Method of Manufacturing ERW Steel Pipe 100]
The method for manufacturing the ERW steel pipe 100 using the above-described ERW steel pipe welded annealing device 6 is as follows. FIG. 19 is a manufacturing flowchart of the electric resistance welded steel pipe 100 according to the present embodiment. Referring to FIG. 19, first, the steel strip is rolled in the width direction to form an open pipe using the forming apparatus 3 (S1). Next, both ends extending in the longitudinal direction of the open pipe are heated and melted, and both ends are pressed and welded (S2). Thereafter, the welded portion WL is annealed by using the above-described electric resistance welded steel tube welded portion annealing apparatus 6 (S3). After annealing, the electric resistance welded steel pipe 100 is made to have a predetermined outer diameter by using the shaper 7 (S4). Through the above manufacturing steps, an electric resistance welded steel pipe is manufactured.

  The embodiments of the present invention have been described above. However, the above-described embodiment is merely an example for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

6 ERW weld pipe annealing device 10 Heating unit 11 Drive mechanism 61 Marking device 65 Control device 601 Weld portion position detection device 651 Acquisition unit 652 Weld portion position determination unit 653 Drive mechanism control unit DT detection device MD Marking position detection unit PA welding Section heating device PD profile detection section

Claims (9)

An electric resistance welded steel pipe weld annealing apparatus for annealing a welded part of an electric resistance welded steel pipe,
A plurality of welding portion heating devices arranged in a line along the traveling direction of the ERW steel pipe,
A marking device that is arranged upstream of the plurality of welding portion heating devices and performs marking on the outer surface of the ERW steel pipe that is progressing from the upstream to the downstream,
A plurality of detection devices arranged along the traveling direction of the ERW steel pipe,
A control device that controls the movement of a heating unit in each of the welding unit heating devices, based on a detection result of the detection device,
The welding portion heating device,
The heating unit for heating the welded portion of the ERW steel pipe,
A drive mechanism that moves the heating unit in the left-right direction perpendicular to the longitudinal direction of the ERW steel pipe, and arranges the heating unit on the welded part,
The detection device,
At the position of the detection device, a marking position detection unit that detects the position of the marking of the ERW steel pipe,
A profile detection unit that detects a part of the outer surface shape of the ERW steel pipe at a cross section perpendicular to the longitudinal direction of the ERW steel pipe at the position of the detection device,
The control device includes:
An acquisition unit that acquires marking position information on the position of the marking detected by the marking position detection unit and profile information on a position of a part of the outer surface shape detected by the profile detection unit.
Based on the obtained marking position information and the profile information, at the position of the welding portion heating device, a welding portion position determination unit that determines the position of the welding portion of the ERW steel pipe,
A drive mechanism that controls the drive mechanism to move the heating unit so that the heating unit is disposed on the welded part based on the position of the welded part determined by the welded part position determination unit. A control unit;
ERW steel pipe weld annealing equipment. It is an electric resistance welded steel pipe welding part annealing apparatus according to claim 1,
The plurality of detection devices,
Among the plurality of welding portion heating devices, a first detection device arranged on the entrance side of the welding portion heating device arranged most upstream,
And a second detection device disposed on the exit side of the welding portion heating device disposed most downstream among the plurality of welding portion heating devices.
ERW steel pipe weld annealing equipment. It is an electric resistance welded steel pipe welded part annealing apparatus according to claim 1 or claim 2,
The acquisition unit,
Acquiring the marking position information of the adjacent detection device and the profile information,
The welding portion position determining unit,
Based on the marking position information and the profile information of the adjacent detection devices, the position of the welded portion of the ERW steel pipe at the position of the welding portion heating device is determined.
ERW steel pipe weld annealing equipment. It is an electric resistance welded steel pipe welding part annealing apparatus according to claim 3,
The welding portion position determining unit,
Based on the plurality of profile information from the adjacent detection device, from the detection device of the previous stage to the detection device of the subsequent stage, to determine the amount of movement of the ERW steel pipe itself in the left-right direction,
Based on the plurality of profile information and the plurality of marking position information, the amount of movement of the welded portion in the left-right direction due to rotation of the ERW steel pipe from the preceding detection device to the subsequent detection device. ,
The electric resistance welded steel pipe at the position of the welding portion heating device based on a lateral movement amount of the electric resistance welded steel tube itself and a lateral movement amount of the welded portion caused by rotation of the electric resistance welded steel tube. Finding the position of the weld,
ERW steel pipe weld annealing equipment. An electric resistance welded steel pipe welded annealing apparatus according to any one of claims 1 to 4,
When the ERW steel pipe weld annealing device is viewed from the side, between the adjacent weld heating devices, the detection device is disposed,
ERW steel pipe weld annealing equipment. An electric resistance welded steel pipe weld annealing apparatus according to any one of claims 1 to 5,
When the ERW steel pipe welding part annealing apparatus is viewed from a side surface, the apparatus further comprises a guide roll for gripping the ERW steel pipe between adjacent welding part heating apparatuses,
ERW steel pipe weld annealing equipment. It is an electric resistance welded steel pipe weld annealing equipment according to claim 6,
On the entry side or exit side of the guide roll, the detection device is provided,
ERW steel pipe weld annealing equipment. An electric resistance welded steel pipe weld annealing apparatus according to any one of claims 1 to 7,
At the position of the marking device, a welding portion position detecting device is provided,
ERW steel pipe weld annealing equipment. A method for manufacturing an ERW steel pipe,
Using a forming device, the steel strip is rolled in the width direction, and a forming step of forming a tubular open pipe,
A welding process that extends in the longitudinal direction of the open pipe, and welds side edges arranged to face each other by electric resistance welding to form a welded portion,
An annealing step of performing an annealing process on the welded portion using the electric resistance welded steel tube welded portion annealing apparatus according to any one of claims 1 to 8,
The annealing step includes:
By the marking device, a step of performing marking on the outer surface of the ERW steel pipe progressing from upstream to downstream,
A step of detecting the position of the marking on the ERW steel pipe by the marking position detection unit of the detection device;
A step of detecting a part of an outer surface shape of the ERW steel pipe in a cross section perpendicular to a longitudinal direction of the ERW steel pipe by the profile detection unit of the detection device;
A step of acquiring marking position information on the position of the marking detected by the marking position detection unit and profile information on a part of the outer surface shape detected by the profile detection unit,
Based on the obtained marking position information and the profile information, at the position of the welding portion heating device, a step of obtaining the position of the welded portion of the ERW steel pipe,
Controlling the drive mechanism to move the heating unit so that the heating unit is disposed on the welding unit based on the determined position of the welding unit.
Manufacturing method of ERW steel pipe.

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