JPS61176401A - Heating furnace installation for direct rolling - Google Patents

Abstract

PURPOSE:To obtain a heating installation for direct rolling capable of using hearth rolls for the whole transportation of stocks and reducing the flaws of hearth and stock, by dividing a heating furnace in two by arranging a heat retaining furnace on a direct stock-transporting line set between a continuous casting installation and a rolling installation and arranging a heating furnace at the side of rolling installation. CONSTITUTION:A billet delivered from a continuous casting installation (a) is fed from a roll table (b) to a billet charging bed (d). The billet discharged from the bed (d) is fed to a heating furnace (i) from a carry-in table (e) of heat retaining furnace, and is heated up to a rolling temperature. Next, the billet heated in the furnace (i) is fed to a rolling installation (l) through a roll table (i) at the rear side of furnace (i). Further, a heat retaining furnace (q) installed adjacently to a roll table (f), is heated by the waste heat of a combustion gas of furnace (i), and the heat of spare stocks is insulated to absorb the imbalance between the production rates of continuous casting and rolling. In said process, the hearth rolls can be used for the whole transportation of stock.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to heating furnace equipment for direct rolling.

[Prior art] Improvements in continuous casting technology have significantly improved the quality of slabs, so from the perspective of energy saving, continuously cast hot slabs are directly charged (fed) into a heating furnace. So-called hot charging is being implemented.

By the way, most of the conventional technologies of this type are the so-called intermediate charging method, in which warm slabs are charged into the heating furnace from the middle of the heating furnace in contrast to the line where cold slabs are charged into the heating furnace. Ta(
JP-A-54-160503, JP-A-55-13412
No. 5, JP-A-55-148716, etc.).

However, in the case of this intermediate charging method, hearth rollers cannot be used to transport the hot slabs, so the slabs must be slid over the hearth before being charged into the heating furnace, resulting in severe damage to the hearth. There was a problem that the warm slab was damaged.

[Purpose of the Invention] The present invention has been made in view of the above-mentioned conventional problems, and adopts a direct method in which the material sent from the continuous casting equipment is sent directly to the rolling equipment through a specific heating furnace. The purpose of this is to enable the use of hearth rollers for all conveyance.

[Structure of the Invention] Therefore, in the present invention, a heat retention furnace and a temperature raising furnace are arranged between the continuous casting equipment and the rolling equipment, and the heat passing from the continuous casting equipment to the heat retention furnace and passing through the temperature raising furnace. A material direct delivery line leading to the rolling equipment is set up, and surplus material is stocked as needed inside the insulating furnace for this direct delivery line, and the stocked surplus material is transferred to the direct delivery line as necessary. At least a feeding line is provided, and the heat-retaining furnace is configured to be heated by the combustion exhaust gas from the temperature raising furnace.

[Effects of the Invention] According to the present invention, a material direct feed line is set between continuous casting equipment and rolling equipment, a heat retention furnace is arranged on the continuous casting equipment side of the direct feed line, and a temperature raising furnace is placed on the rolling equipment side. Place the furnace and set the heating furnace to 2.
Since it is divided, hearth rollers can be used for all conveyance of the material, reducing damage and damage to the hearth and material.

In addition, hearth rollers can be used for all material transport, so
Can be applied to all types of furnaces.

Furthermore, since the combustion exhaust gas from the heating furnace can be used in the warming furnace, the fuel consumption rate can be lowered.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which the temperature raising furnace is a walking beam furnace, a walking hearth furnace, or a Busha furnace.

In the figure, a continuous casting facility a and a rolling facility Q are arranged, and the billet sent out from the continuous casting facility a is sent from a roller table b via a cross conveyor C to a billet cutting table d.

The cross conveyor C may be bushy.

The billet cutting table d may be a bush or a transfer.

One billet or a plurality of billets are cut from the billet cutting table d to the heating furnace loading table e, and from the heating furnace loading table e to the heating furnace front roller table f, the heating furnace loading roller table g, and the heating furnace F. It is fed into the heating furnace i via the bottom roller table h.

Since a hearth roller is provided inside the temperature rising furnace i, there are few damages or scratches on the hearth and billet.

This heating furnace i is for raising the temperature of the billet to the rolling temperature.

The billet heated in the temperature rising furnace i is sent to the temperature rising furnace bottom roller table j.
From there, it is sent to the rolling equipment Q via the temperature rising furnace discharge roller table k.

In this way, the billet sent out from continuous casting equipment a,
A series of lines that pass through a heat retention furnace q (described later), pass through a temperature raising furnace i, and are sent to the rolling equipment Q are billet (material) direct feed lines.

On the other hand, on the side of the roller table e for carrying into the heat insulating furnace, there is a billet cooling table m continuous with the roller table e and a cypress wood (
A billet) loading table n and a coating material carrying-in roller table p are provided.

The coating material loading table n is for delivering the cypress material to the coating material carrying-in roller table p, and may be a pusher or a transfer type.

Furthermore, on the side of the heat-retaining furnace front roller table f, a heat-retaining furnace q and a heat-retaining furnace bottom roller table r are provided in succession to the roller table r.

This heat retention furnace q is heated using the exhaust heat of the combustion exhaust gas from the temperature raising furnace i, and in order to absorb the imbalance between continuous casting production and rolling production, it is heated so that the surplus material (billet) is not cooled. It is for stocking.

In addition, if the heat retention furnace q is equipped with a combustion system, continuous casting equipment a
When there is a long-term suspension, etc., the cypress material can be burned together with the heating furnace i to raise the temperature of the cypress material to the rolling temperature.

Furthermore, continuous to the roller table j in front of the heating furnace,
A reject roller table S and a reject stand t are provided.

The reject roller table S is for rejecting the billets on the temperature rising furnace front roller table j and the temperature rising furnace carrying out roller table to the reject table t.

The reject table t may be a button, a transfer lever, or a pop-out lever.

An automatic operation system for direct rolling heating furnace equipment configured as described above will now be described.

(1) When the rolling equipment Q is normal The billet sent out from the continuous casting equipment a is b→C→d−
+e-4f-+g→h→l→j→ is sent to rolling equipment Q.

(2) When the rolling equipment Q is suspended due to rearrangement, hole replacement, guide replacement, etc. The billet sent out from the continuous casting equipment a is b-*C→
d -> 6-* It passes through the f line and is sent to the insulating furnace q to be stocked.

When the heat retention furnace q is full, the billets sent out from the continuous casting equipment a pass through the line 1)-+C-1-d-1-6, and are sent to the cooling table m and stocked.

Since the rolling equipment Q is operated intermittently due to recombination, etc., and the continuous casting equipment A is continuously operated, it is necessary to process surplus materials (billets) when rolling is suspended.

Conventionally, all such surplus materials (billets) are piled up in a billet yard and used as coating materials, so the next time they are sent to rolling equipment C, it is necessary to reheat all the surplus materials (billets) from room temperature. .

Therefore, in this embodiment, the surplus material (billet) is first sent to the heat-retaining furnace q to be stocked and kept warm.

In addition, since the heat retention furnace q is heated using the exhaust heat of the combustion exhaust gas of the temperature rising furnace i, the fuel consumption rate can be lowered.

(3) When the rolling equipment σ returns to normal, the cutting material (billet) from the insulation furnace q is fed between the directly delivered materials (billets) due to the flow in (1), and the
It passes through the line 11-i −+ j −1-k and is sent to the rolling equipment. - (4) If the rolling equipment e is abnormal, the billets remaining on the heating furnace front roller table j and the heating furnace unloading roller table are transferred to the reject roller table without processing the billet according to the flow in (2). Reject from S to reject stand t and stock.

(5) If there is an abnormality in continuous casting equipment a and the billet is an unsuitable material, the billet sent out from continuous casting equipment a is
- Send it from e to cooling table m and make it into scrubbing.

(6) If continuous casting equipment a is abnormal and surplus material is stocked on coating material loading platform n, the billet stocked on coating material loading platform n is sent to coating material carrying roller table p, and this billet is -+-r
->q-+g-eh-*i-+j4 line and sent to rolling equipment Q.

Figure 2 shows an example in which the heating furnace is a barrel furnace.
Its structure 9 and operation are the same as the embodiment shown in FIG. The only difference is that Note that the button U may be an extractor.

[Brief explanation of drawings]

FIGS. 1 and 2 are plan views of first and second embodiments of direct rolling heating furnace equipment according to the present invention. a... Continuous casting equipment, i... Temperature raising furnace, σ... Rolling equipment, n... Coating material loading table, q... Heat retention furnace, t... Reject table. Patent applicant: Kobe Steel, Ltd. Agent: Patent attorney: Mr. Ishikawa and two others Figure 1 Figure 2

Claims (1)

[Claims] (1) A heat retention furnace and a temperature raising furnace are placed between the continuous casting equipment and the rolling equipment, and a direct material delivery line is set up from the continuous casting equipment, passing through the heat retention furnace, passing through the temperature raising furnace, and reaching the rolling equipment. At least a line is set up for the direct delivery line to stock surplus materials as necessary inside the heat insulating furnace, and to send the stocked surplus materials to the direct delivery line as necessary, and the above-mentioned A heat retention furnace is a heating furnace equipment for direct rolling that is heated by combustion exhaust gas from a heating furnace.