JP2516675B2 - Hot slab rolling method and hot rolling equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot rolling facility, and more particularly to a rolling method for a hot rolling facility in which a width reduction device is provided between a heating furnace and a rough rolling mill, and Regarding the hot rolling equipment.

[Conventional technology]

Conventionally, in hot rolling equipment, width reduction of a rolled material (hot slab) is performed by a width reduction device,
As the width reduction device, a device using a taper mold having a parallel portion is described in JP-A-59-101201.

[Problems to be Solved by the Invention]

In this publication, only the width reduction device is described, and its front and rear equipment and equipment layout are not described, but when introducing it to an actual hot rolling equipment, the equipment location is a heating furnace and A space between the first rough rolling mill (hereinafter, simply referred to as a rough rolling mill) is considered.

By the way, the layout of the hot rolling equipment is determined by steel type, rolled material size, rolling mill model, production amount, and the like. For example, when the rough rolling mill is a reversible type or backpass type, the table length between the heating furnace and the rough rolling mill is determined by the length of the rolled material after rolling in the rough rolling mill, and the table length of the rolled material after rolling is determined. The length of the rear end reaches the vicinity of the heating furnace. Therefore, if the rough rolling mill is a non-reversible type or if there is a sufficient margin in the table length between the heating furnaces of the rough rolling mill, there is no problem, but the reversible type of the existing equipment or the back-pass type rough rolling is used. When introducing the width reduction device between the rolling mill and the heating furnace, since the rolling material rear end during rough rolling in the rough rolling mill and the rolled material tip during width reduction in the width reduction device interfere, rough rolling and width Since reduction cannot be performed at the same time, it is necessary to wait for the start of width reduction until the end of rough rolling.
For this reason, the processing time for one slap becomes the sum of the time required for the width reduction device and the rough rolling mill, which causes a problem that the production amount decreases.

The purpose of the present invention is to effectively utilize the table length between the rough rolling mill and the heating furnace, and to simultaneously perform rough rolling and width reduction without causing interference between the rolled material during rough rolling and the rolled material during width reduction. It is possible to provide a hot slab rolling method and hot rolling equipment that can be performed and do not reduce the production amount.

[Means for solving the problem]

The above-mentioned object is a hot rolling facility comprising a width reduction device for a hot slab using a taper die having a parallel portion between a heating furnace and a reversible or back-pass rough rolling machine, Reversing type or back-pass type rough rolling equipment Rough rolling of the preceding hot slab, and at the same time, the width reduction device feeds the subsequent hot slab from the rough rolling mill side toward the heating furnace side to reduce the entire length of the slab. It is achieved by a hot slab rolling method characterized by:

Further, the above-mentioned object is to install a width reduction device for a hot slab using a taper die having a parallel portion between a heating furnace and a reversible or back-pass rough rolling mill, and for the width reduction device. A side guide is provided at least on the rough rolling mill side, and between the width reduction device and the rough rolling mill, the hot slab is fed toward the width reduction device and the width reduction roller table and the hot slab are fed to the rough rolling mill. This is achieved by a hot rolling facility characterized in that it is provided with a transporting roller table consisting of two systems of a rough rolling roller table to be sent toward.

[Action]

In the present invention configured as described above, at the same time as roughly rolling the hot slab of the reversible or back-pass rough rolling equipment preceding, the hot slab of the trailing hot slab by the width reduction device from the rough rolling mill side to the heating furnace side. In the initial stage of rough rolling and width reduction, the slab length rough-rolled by the rough rolling mill is short by feeding the slab over the entire length while feeding toward the slab. Even if the width reduction is performed at the same time, the preceding slab during the rough rolling and the trailing slab during the width reduction do not interfere with each other on the roller table between the width reduction device and the rough rolling machine, and in the latter period, the rough rolling was performed. The slab length becomes long and occupies most of the roller table between the rough rolling mill and the width reduction device, but at that time, most of the slabs being width reduced have gone to the heating furnace side, so this Even if the slabs do not interfere with each other In this way, by effectively using the roller table length between the rough rolling mill and the width reduction device and reversing the feeding direction to the width reduction device from the conventional one, rough rolling can be performed without causing interference between slabs. The width reduction can be performed simultaneously.

〔Example〕

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

FIG. 1 to FIG. 3 show the movement of the hot slab in time series in the hot rolling equipment and the rolling method using the hot rolling equipment of the present embodiment.

In the figure, the equipment line direction is from right to left, and the heating furnace 1, the width reduction device 2, and the reversible rough rolling device 3 which is the first rough rolling device 3 are installed in this order from the upstream of the line, and the rough rolling of the width reduction device 2 is performed. On the machine 3 side, a side guide 4 is provided for guiding the slab that is subjected to width reduction by the width reduction device 2. Width reduction device 2
A roller table composed of two systems, that is, a roller table 5 for width reduction and a roller table 6 for rough rolling is arranged between the roller and the rough rolling mill 3. It is driven so as to send it to the machine 3.

First, in FIG. 1, the slab 7 that has not been subjected to width reduction is mounted on the width reduction roller table 5, and the slab 8 that has been subjected to width reduction is mounted on the rough rolling roller table 6. From now on, the slab 7 is subjected to width reduction by the width reduction device 2, and the slab 8 is about to be subjected to reverse rough rolling of 5 passes by the rough rolling mill 3.

In Fig. 2, the rough rolling mill 3 finishes the second pass of the rough rolling of the slab 8, and the width reduction is performed while feeding the slab 7 from the rough rolling mill 3 side toward the heating furnace 1 side, and the width is about 1/4. It has been rolled down.

In Fig. 3, the rough rolling mill 3 completes the coarse rolling pass, and the width reduction is completed, and the slab 11 to be width reduced next is the heating furnace 1.
The final fifth pass of the rough rolling in the rough rolling mill 3 is started, and the slab 7 whose width reduction has been completed and the slab 11 immediately after extraction are conveyed to the downstream side of the line, Return to the state shown in the figure.

As can be seen from FIGS. 1 to 3, the length of the slab naturally becomes longer as the rough rolling process in the rough rolling mill 3 progresses.
At the end of the pass, most of the roller table between the width reduction device 2 and the rough rolling mill 3 is occupied. In the existing hot rolling equipment, the distance between the heating furnace 1 and the rough rolling mill 3 is determined by the length of the rough rolled slab, and when a width reduction device is further introduced therein, the length of the roller table is reduced. There is often no room left. Therefore, when the slab is fed from the heating furnace 1 side toward the rough rolling mill 3 in the conventional manner with the roller table length reduced as described above, the slab is reduced in width by four passes as shown in FIG. Even at the end of the eye, the width reduction can proceed only about 1/2 of the slab. This is because even if the width reduction is started early, the rear end of the slab 10 that has finished the fourth pass of the rough rolling and the front end of the slab 7 during width reduction interfere with each other.

On the other hand, in this embodiment, even if the rough rolling in the rough rolling mill 3 and the width reduction in the width reduction device 2 are simultaneously started, the slab 7 is moved from the rough rolling mill 3 side toward the heating furnace 1 side. By performing the width reduction while feeding, the rear end of the slab 10 that has finished the fourth pass of the rough rolling does not interfere with the tip of the slab 7 during the width reduction as shown in FIG.

First, the outline of the present embodiment has been described above. Next, the cycle for treating the slab with the slab dimensions and the rough rolling schedule as shown in the table shown in FIG. 6 in the equipment arrangement shown in FIG. 5 will be specifically described. To do.

In Fig. 5, the horizontal direction shows the equipment arrangement and the vertical direction shows the passage of time, and the position and size of the material in the width reduction and rough rolling can be known. Sixth according to the rolling method of the present embodiment
When the slabs are processed according to the table in the figure, the slabs during rough rolling and the slabs during width reduction come closest to each other at the end of the 4th pass of rough rolling, but there is still a margin of 3.7 m, and before the completion of rough rolling. The width reduction can be completed and the idle time between cycles is 5 seconds, which can minimize the idle time.

On the other hand, when width reduction is performed from upstream to downstream of the line, the distance between the slab during rough rolling and the slab during width reduction at the end of the fourth pass of rough rolling is 1 m as shown in Fig. 7. However, the width reduction start must be sent 28 seconds after the rough rolling start, and the idle time between cycles becomes 33 seconds, which reduces the production volume.

As described above, according to the present embodiment, the rough rolling in the reversible rough rolling machine and the width reduction in the width reduction device can be performed at the same time without causing interference between the slabs, and the width reduction is completed before the rough rolling is completed. This is effective in minimizing idle time between slab processes. Further, since the width reduction device can be installed with the distance between the rough rolling mill and the heating furnace being the same as the conventional one, the length of the equipment can be made compact.

Although the embodiments of the present invention have been described with respect to the hot rolling equipment using the reversible rough rolling mill, the present invention can be similarly applied to the hot rolling equipment using the back-pass rough rolling mill. Is.

〔The invention's effect〕

According to the present invention, the table length between the reversible or back-pass rough rolling mill and the width reduction device is effectively used, and rough rolling and width reduction can be performed simultaneously without causing interference between slabs, The idle time between slab treatments can be minimized, the production efficiency is improved, and the length of the equipment can be made compact.

[Brief description of drawings]

FIG. 1 is a plan view showing a rolling state at the start of rolling of a hot rolling facility according to an embodiment of the present invention, and FIGS. 2 and 3 are respectively subsequent rolling states of the hot rolling facility. FIG. 4 is a plan view showing in chronological order, and FIG. 4 is a similar plan view showing a rolling state in a conventional hot rolling facility for comparison,
FIG. 5 is an explanatory view showing a processing cycle of the rolling method according to the embodiment of the present invention, in which the vertical direction shows the passage of time, the horizontal direction shows the equipment arrangement, the slab position and the length.
The figure is a table showing slab dimensions and rough rolling schedule in the same processing cycle, and FIG. 7 is an explanatory view similar to FIG. 5 showing a processing cycle by a conventional hot rolling facility for comparison. Explanation of code 1 …… Heating furnace 2 …… Width reduction device 3 …… Reversible rough rolling machine 4 …… Side guide 5 …… Width reduction roller table 6 …… Rough rolling roller table 7 to 11 …… Slab

 ─────────────────────────────────────────────────── ─── Continued front page (72) Kenichi Matsumoto 11-1 Showa-cho, Kure City, Hiroshima Prefecture Nisshin Steel Co., Ltd. Kure Steel Works (72) Inventor Hiroshi Narahara 11-11 Showa-cho, Kure City, Hiroshima Prefecture Nisshin Steel Co., Ltd. Inside the Kure Works (56) References JP-A-62-166001 (JP, A)

Claims (2)

(57) [Claims] 1. A hot rolling facility comprising a width reducing device for a hot slab using a taper die having a parallel portion between a heating furnace and a reversible or back-pass rough rolling mill,
Simultaneously rough rolling the preceding hot slab with the reversible type or back-pass type rough rolling machine, and at the same time, feed the subsequent hot slab from the rough rolling machine side toward the heating furnace side by the width reduction device to reduce the total length of the slab. A method for rolling a hot slab characterized by performing width reduction. 2. A width reducing device for a hot slab using a taper die having a parallel portion is installed between a heating furnace and a reversible or back-pass rough rolling mill, and a side for the width reducing device is installed. A guide is provided at least on the rough rolling mill side, and between the width reduction device and the rough rolling mill, the width reduction roller table and the hot slab that direct the hot slab toward the width reduction device are directed to the rough rolling mill. The hot rolling equipment is characterized in that it is provided with a roller table for conveyance comprising two systems of a roller table for rough rolling.