JP2008194715A - Hot-rolling equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot-rolling equipment in which a stand-by unit and a rolling mill are arranged appropriately to minimize the non-rolling time of the rolling mill when performing passing rolling. <P>SOLUTION: At least a part of the stand-by unit 3 unit is situated within the range that is reached when a material A (stand-by material) is rolled to a prescribed thickness and also away from a rolling mill 1 by a distance with which a material B (passing material) after broadside rolling is rotatable. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot rolling facility for steel materials (particularly, thick steel plates).

  In thick plate rolling, an excellent material thick steel plate is built by performing controlled rolling (CR) in the middle of rolling.

  At that time, when the temperature at the time of controlled rolling (controlled rolling start temperature) is low and the plate thickness at the time of controlled rolling (controlled rolling start plate thickness) is thick, the rolled material becomes the controlled rolling start temperature. Since a considerable amount of time is required, the rolled material is kept on standby until the controlled rolling start temperature is reached on the conveyance table in the vicinity of the hot rolling mill (reversible hot rolling mill). As a result, there is a problem that idle time is generated in the hot rolling mill due to the waiting for cooling, and the rolling efficiency is hindered.

In order to avoid that the idle time is generated in the hot rolling mill due to such cooling waiting and the rolling efficiency is hindered, for example, in Patent Document 1, transport is performed on the finishing rolling mill entrance side of the hot rolling line. There is disclosed a standby apparatus for a rolled material including a lifting device having a cantilevered fork-like arm that lifts a hot rolled material on a table to a height that allows the next rolled material to pass through and holds it in a standby state.
JP-A-4-274814

  However, Patent Document 1 suggests that by using a standby device, it is possible to pass the rolling material that needs to be cooled and roll the next rolled material (passing rolling). There is no indication as to how the positional relationship (arrangement) of the machines should be.

  For example, if the standby device is in the vicinity of the rolling mill, the material being rolled interferes with the standby device, so that during the operation of the standby device, the rolling mill cannot be rolled, and the non-rolling time of the rolling mill is appear. Further, when the standby device is far away from the rolling mill, there is no interference with the rolled material as described above, but it takes time to transport the rolled material to be standby to the standby device, and the Rolling time is generated.

  The present invention has been made in view of the circumstances as described above, and when performing overtaking rolling, in order to minimize the non-rolling time of the rolling mill, the standby apparatus and the rolling mill are appropriately arranged. The object is to provide rolling equipment.

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

[1] In a hot rolling facility equipped with a standby device for waiting a rolled material rolled to a predetermined plate thickness, overtaking the standby rolled material and rolling the next rolled material,
The standby device has at least a part of the device positioned within a range that is reached when the rolled material to be standby is rolled to a predetermined thickness, and rolls the next rolled material by rolling out the next rolled material. The hot rolling equipment is located away from the hot rolling mill by a distance that enables

  [2] The hot rolling facility according to [1], wherein the standby device is movable in a rolling direction according to a rolling length of a rolled material to be standby.

  In the present invention, when overtaking rolling is performed, it is possible to shorten as much as possible the time for transporting the rolled material (standby material) to be standby to the standby device, and the next rolled material during the operation of the standby device. Can be rolled, so that the non-rolling time of the rolling mill generated when the standby material is put on standby can be made extremely short, and the rolling efficiency can be improved.

  An embodiment of the present invention will be described with reference to the drawings. In the following description, the rolled material that is on standby is referred to as A material, and the rolled material that is rolled over the A material is referred to as B material.

  FIG. 1 is a schematic diagram showing the basic concept of this embodiment. In FIG. 1, a standby device 3 is installed on the upstream side of the reversible hot rolling mill 1 using the gap between the table rollers 2. The standby device 3 is positioned below the pass line until the A material is rolled to a predetermined plate thickness (for example, controlled rolling start plate thickness). The material is lifted upward from the table roller 2 and held, while the material A is overtaken so that the material B can pass.

  In this embodiment, the standby device 3 uses the B material after tentering rolling while at least a part of the device is located within the range reached when the A material is rolled to a predetermined plate thickness. It is located away from the rolling mill 1 by a distance that enables rolling.

  That is, as shown in FIG. 1, the length of the standby device 3 is Lw, the rolling length when the A material is rolled to a predetermined plate thickness is Lp, and the kickout length when the rolled material bites away from the rolling mill 1. Lk, the length of the space necessary for performing the tentering rolling of the rolled material (space for tentering rolling) is Lt, the X axis is taken upstream from the rolling mill 1 as the origin, and the width The X coordinate of the upstream end of the exit space is Xt (= Lt), the X coordinate of the downstream end 3a of the standby device 3 is Xa, the X coordinate of the upstream end 3b of the standby device 3 is Xb (= Xa + Lw), A If the X coordinate of the upstream end when the material is rolled to a predetermined plate thickness is Xp (= Lp + Lk), in this embodiment, Xp ≧ Xa ≧ Xt is satisfied.

  In addition, the length Lt of the above-mentioned tentering rolling space is a length that enables the rolling operation of the rolled material having the maximum rolling width. If the maximum rolling width is Wp, the length Lt is a square having a side Wp. This is the diagonal length (Wp / sin 45 °) plus the kickout length Lk. For example, in the case of the maximum rolling width Wp = 5350 mm, if the kickout length Lk = 500 mm, the space length for unrolling rolling Lt = 5350 mm × 1.4 + 500 mm≈8 m.

  Based on such an embodiment, for example, as shown in FIG. 4, for the A material having a rolling length Lp of 15 m, the kick-out length Lk is set to 500 mm, and the X coordinate of the downstream end 3 a of the standby device 3 is set. When it arrange | positions so that Xa may be set to 15.5m (namely, Xa = Xp), the time which conveys A material from the position which finished rolling to predetermined plate | board thickness to the position of the waiting | standby apparatus 3 becomes unnecessary. Compared to this, as shown in FIG. 5, when Xa = 30 m, the extra transport time is required.

  Then, as shown in FIG. 6, the A material is mounted on the standby device 3 and lifted from the table roller 2, while the B material passes through the A material in the meantime, and then the B material is passed as shown in FIG. 7. During the tentering rolling, the A material mounted on the standby device 3 is returned to the table roller 2 and conveyed to the upstream side to stand by at a position where it does not interfere with the B material being rolled. In this way, the B material can be rolled during the operation of the standby device 3.

  As described above, in this embodiment, when overtaking rolling is performed, it is possible to shorten the time for conveying the A material to the standby device 3 as much as possible, and during the operation of the standby device 3 B Since the material can be rolled, the non-rolling time of the rolling mill 1 generated when the material A is put on standby can be extremely shortened, and the rolling efficiency can be improved.

  As described above, in this embodiment, the standby device 3 is arranged so as to satisfy Xp ≧ Xa ≧ Xt, but the most preferable arrangement from the viewpoint of efficiency is as shown in FIG. In addition, an arrangement in which the length center position Xpc (= (Xp + Xk) / 2) of the A material rolled to a predetermined plate thickness and the length center position Xwc (= (Xa + Xb) / 2) of the standby device 3 coincide ( Xpc = Xwc). In this case, the standby device 3 can lift the A material that has been rolled to a predetermined thickness. However, since Xa ≧ Xt needs to be satisfied, if Xa <Xt is satisfied when Xpc = Xwc is satisfied, Xa = Xt may be satisfied.

  Further, when the material A collides with the standby device 3 due to downward warping or the like and equipment damage is concerned, as shown in FIG. 3, the upstream end position Xp of the material A and the downstream end position Xa of the standby device 3 If the arrangements match (Xp = Xa), this means a suitable arrangement considering the equipment maintenance.

  Incidentally, generally, the rolling length Lp of the A material rolled to a predetermined plate thickness is not constant (for example, Lp = 10 to 30 m). Therefore, when the maximum rolling length (for example, 30 m) of the A material is Lpmax and the upstream end position of the A material is Xpmax (= Lpmax + Lk), in this embodiment, Xpmax ≧ Xa ≧ Xt is satisfied. Thus, the standby device 3 is arranged.

  At that time, when the rolling direction position of the standby device 3 is fixed, the above-described preferable arrangement is obtained with respect to the largest rolling length (for example, 20 m) of the rolling length Lp of the A material. It is effective to make it.

  On the other hand, if the standby device 3 can be moved in the rolling direction in accordance with the rolling length Lp of the A material, the standby device 3 is moved in the rolling direction so that the above-described preferable arrangement is obtained for each A material. Can be installed.

  In the above embodiment, the standby device 3 is arranged on the upstream side of the rolling mill 1, but the same applies to the case where the standby device 3 is arranged on the downstream side of the rolling mill 1.

It is a figure which shows the fundamental view of one Embodiment of this invention. It is a figure which shows the suitable case in one Embodiment of this invention. It is a figure which shows the other suitable case in one Embodiment of this invention. It is a figure which shows an example in one Embodiment of this invention. It is a figure which shows a comparative example. It is a figure which shows the operation state of the waiting | standby apparatus in one Embodiment of this invention. It is a figure which shows the operation state of the waiting | standby apparatus in one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reversible hot rolling mill 2 Table roller 3 Standby device 3a Downstream end of standby device 3b Upstream end of standby device

Claims (2)

In a hot rolling facility equipped with a standby device for rolling the next rolled material by overtaking the rolled material that has been rolled up to a predetermined thickness and waiting for the rolled material that has been on standby,
The standby device has at least a part of the device positioned within a range that is reached when the rolled material to be standby is rolled to a predetermined thickness, and rolls the next rolled material by rolling out the next rolled material. The hot rolling equipment is located away from the hot rolling mill by a distance that enables   The hot rolling facility according to claim 1, wherein the standby device is movable in a rolling direction according to a rolling length of a rolled material to be standby.

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