JP4882415B2 - ERW pipe seam heat treatment equipment - Google Patents

Description

  The present invention relates to a seam heat treatment facility for heat treating a seam portion of an electric resistance welded tube.

  FIG. 4 is a view showing an example of the equipment configuration in a conventional ERW pipe manufacturing line (for example, see Patent Document 1). In FIG. 4, the steel strip 1 wound in a coil shape is rewound by an uncoiler 11 and gradually formed into a circular cross section while passing through a forming roll group 12, and then a plate edge by a high frequency heating device 13. The part is heated to a molten state, and is welded and joined by the squeeze roll 14 to form the element tube 2. Then, the blank 2 passes through a sizing roll group 18 via a bead cutting machine 15, a seam induction heating device 16, and a cooling device 17, and is cut to a regular size by a cutting machine 19 and has the desired characteristics. Tube 3 is formed.

At that time, based on the wall thickness, standard grade, application, etc. of the electric resistance welded tube 3, as shown in FIG. 5 (a), the welded seam portion 4 of the base tube 2 is heated to a predetermined temperature by the seam portion induction heating device 16. After raising the temperature under conditions, the cooling device 17 is rapidly cooled under predetermined cooling conditions. Thereby, the material characteristic of the weld seam part 4 is adjusted.
Japanese Patent Laid-Open No. 10-140251

  By the way, the raw tube 2 continues to the cutting machine 19, and the seam portion 4 may be twisted in the tube circumferential direction. When heating is performed by the seam induction heating device 16 in such a seam twisted state, the seam portion 4 is detached from the induction heating region 5 of the seam induction heating device 16 as shown in FIG. The heat treatment of the seam portion 4 is not properly performed. As a result, desired material characteristics cannot be obtained, leading to poor quality of the ERW pipe 3.

  The present invention has been made in order to solve the above-described problems, and even in the case where seam twisting occurs in an electric resistance welded tube production line, the electric resistance welded tube capable of appropriately heat-treating the welded seam portion. It aims to provide a seam heat treatment facility.

  In order to solve the above problems, the present invention has the following features.

[1] A facility for heat-treating a seam portion of a welded pipe in an ERW pipe production line, which is arranged on the downstream side of the seam part induction heating device that is movable in the pipe circumferential direction. A cooling device arranged on the downstream side of the cooling device, a seam twist correcting device that corrects seam twist by turning the tube around the tube axis , and a seam on the inlet side of the seam twist correcting device. A seam heat treatment facility for an ERW pipe, comprising a seam detector for observing a position in the pipe circumferential direction .
[2] A seam heat treatment method for an electric resistance welded pipe using the seam heat treatment equipment for an electric resistance welded pipe according to [1], wherein the position of the seam in the pipe circumferential direction observed by the seam detector is from above the pipe. When the angle is within a predetermined angle range in the pipe circumferential direction, the induction heater is moved in the pipe circumferential direction so that the induction heating area is aligned with the position of the seam. When the observed circumferential position of the seam is outside the predetermined angular range from directly above the pipe in the circumferential direction, the seam twist correcting device corrects the circumferential position of the seam within the predetermined range. A seam heat treatment method for an electric resistance welded tube characterized in that the induction heating region is aligned with the position of the seam by moving the inductor of the seam induction heating device in the pipe circumferential direction.

  In the present invention, since a seam induction heating device that can move in the pipe circumferential direction and a seam twist correction device that corrects the seam twist by turning the water-cooled tube around the tube axis are provided. By combining these, even if seam twisting occurs, the weld seam can be appropriately heat-treated. As a result, it is possible to stably manufacture a good quality electric sewing tube.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an equipment configuration of an ERW pipe production line according to an embodiment of the present invention. In FIG. 1, a steel strip 1 wound in a coil shape is rewound by an uncoiler 11, and gradually formed into a circular cross section while passing through a forming roll group 12, and then a plate edge portion by a high-frequency heating device 13. Is heated to a molten state, and is welded and joined by the squeeze roll 14 to form the element tube 2. The base tube 2 then passes through the sizing roll group 18 via the bead cutting machine 15 and the seam heat treatment equipment 21, and is cut to a regular size by the cutting machine 19, thereby forming the ERW pipe 3 having desired characteristics.

  In this embodiment, the seam heat treatment equipment 21 has a seam part induction heating device 16 for raising the temperature of the seam part 4 of the base tube 2 under a predetermined heating condition, and a predetermined cooling of the heated seam part 4. It comprises a cooling device 17 for rapid cooling under conditions, and a seam twist correction device 20 that corrects seam twist by turning around the tube axis of the raw tube 2 that has passed through the cooling device 17.

  Here, as shown in FIG. 2 (a), the seam portion induction heating device 16 is configured such that the inductor 16a is movable in an angular range of ± θ in the tube circumferential direction from directly above the raw tube 2. When the seam twist occurs, the seam portion 4 is positioned in the induction heating region 5 by moving in the twist direction as shown in FIG.

  Note that if the movable angle range of the inductor 16a in the tube circumferential direction is too large, the apparatus becomes large, so the movable angle range θ is preferably about 30 °.

  In addition, as shown in FIG. 3, the seam twist correction device 20 sandwiches the raw tube 2 from side to side, one is fixed to the pass line height of the raw tube 2, and the other is a pair of movable heights up and down. The drum-shaped rolls 20a and 20b are provided. Thereby, if the height position of the vertically movable roll 20b is moved upward, the raw tube 2 is turned around the tube axis in the arrow A direction, and if moved downward, it is moved in the arrow B direction. It has come to be turned.

  The seam twist correction device 20 is arranged on the downstream side of the cooling device 17 because the raw tube 2 is likely to be deformed immediately after heating by the seam induction heating device 16, so that the twist correction by the seam twist correction device 20 is performed. This is because almost no effect can be obtained, but after the cooling by the cooling device 17, the raw tube 2 becomes room temperature and is not easily deformed, so that the twist correction effect by the seam twist correction device 20 is easily obtained.

  In the seam heat treatment equipment 21 described above, the position of the seam 4 in the pipe circumferential direction is visually observed by the seam detector or the operator on the exit side of the seam induction heating device 16 and the entrance side of the seam twist correction device 20. If it is determined from the observation results that seam twist has occurred, the seam induction heating device 16 or the seam twist correction device 20 is operated as follows.

  First, when the pipe circumferential direction position of the seam 4 on the inlet side of the seam twist correcting device 20 is within an angle range of ± θ (for example, within a range of ± 30 °) from right above the raw tube 2 to the pipe circumferential direction. Moves the inductor 16 a of the seam induction heating device 16 in the pipe circumferential direction so that the induction heating region 5 is aligned with the position of the seam 4.

  On the other hand, when the pipe circumferential direction position of the seam 4 on the inlet side of the seam twist correction device 20 is outside the angle range of ± θ (for example, outside the range of ± 30 °) in the pipe circumferential direction from directly above the raw tube 2. After the seam twist correction device 20 corrects the circumferential position of the seam 4 within an angle range of ± θ (for example, within ± 30 °), the inductor 16a of the seam portion induction heating device 16 is piped. The induction heating area 5 is adjusted to the position of the seam 4 by moving in the circumferential direction.

  Thus, in this embodiment, the seam twist induction which corrects seam twist by rotating the seam part induction heating device 16 movable in the pipe circumferential direction and the raw tube 2 after water cooling around the pipe axis. Since the straightening device 20 is provided, the seam portion 4 can be appropriately heat-treated by combining them even when seam twisting occurs. As a result, it is possible to stably manufacture a good quality electric sewing tube.

It is a figure which shows the installation structure of the ERW pipe manufacturing line in one Embodiment of this invention. It is explanatory drawing of the seam part induction heating apparatus in one Embodiment of this invention. It is explanatory drawing of the seam twist correction apparatus in one Embodiment of this invention. It is a figure which shows an example of the equipment structure of the conventional ERW pipe manufacturing line. It is explanatory drawing of the conventional seam part induction heating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel strip 2 Element pipe 3 Electric sewing pipe 4 Weld bead part 5 Induction heating area | region 11 Decoiler 12 Forming roll group 13 High frequency heating apparatus 14 Squeeze roll 15 Bead cutting machine 16 Seam part induction heating apparatus 16a Inductor 17 Cooling apparatus 18 Sizing roll Group 19 Cutting machine 20 Seam twist correction device 20a Roll with fixed vertical position 20b Roll with movable vertical position 21 Seam heat treatment equipment

Claims (2)

In an ERW pipe manufacturing line, a facility for heat-treating a seam part of a welded pipe, a seam part induction heating device movable in the pipe circumferential direction, and cooling disposed downstream of the seam part induction heating device A seam twist correcting device disposed downstream of the cooling device and rotating the tube around the tube axis to correct the seam twist , and the seam pipe circumferential direction on the inlet side of the seam twist correcting device A seam heat treatment facility for an ERW pipe, comprising a seam detector for observing the position of the seam .   A seam heat treatment method for an electric resistance welded pipe using the seam heat treatment equipment for an electric resistance welded pipe according to claim 1, wherein the position of the seam in the pipe circumferential direction observed by the seam detector extends from directly above the pipe to the pipe circumferential direction. When the angle is within a predetermined angle range, the inductor of the seam induction heating device is moved in the pipe circumferential direction so that the induction heating region is aligned with the position of the seam, and the seam observed by the seam detector is detected. When the pipe circumferential direction position is outside the predetermined angular range in the pipe circumferential direction from directly above the pipe, the seam twist correcting device corrects the pipe circumferential direction position within the predetermined range, and A seam heat treatment method for an electric resistance welded tube characterized by moving an inductor of a seam induction heating device in a pipe circumferential direction so that an induction heating region is aligned with a seam position.

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