JPS62179801A - Method for controlling billet flow for direct rolling - Google Patents

Abstract

PURPOSE:To make direct rolling and to reduce manpower and production cost by determining the billet flow time from a cutting machine to a feeding device, comparing the same with a rolling cycle, predicting whether the billets are excessive or not and determining a billet conveying line. CONSTITUTION:A billet group is transferred by a conveyor 8 to a feeding table and the film Tn till the signal of the succeeding material is measured by a timer and is memorized. The time T1 since the completion of cutting of the final billet until the billet arrives at the feeding table 11 is designated as T1 and the rolling per billet as T0, then (T1+Tn)/n is calculated and the result thereof is compared with T0. The billets flow normally from a continuous casting installation to a rolling installation when (T1+Tn)/n>=T0. The feeding device 12 is, thereupon, fed pitchwise to feed the billets to a roller table 5 of the rolling line. The billets cannot be fed to the rolling line when (T1+Tn)/n<T0 and therefore, the feeding device 12 is advanced to move the billets to a cooling table or holding furnace 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of controlling the flow of steel billets when direct rolling is performed by connecting continuous casting equipment and rolling equipment.

(Prior Art) In recent years, from the viewpoint of energy saving, so-called direct rolling technology has been trending, in which continuous casting equipment and rolling equipment are mechanically connected and continuously cast steel slabs are rolled using the casting heat. In die reflex 1 to rolling, one of the important issues is how to adjust the difference between continuous casting production and rolling production.

Direct rolling methods that have been tried in the past have used the method shown in FIG. 4, for example. The direct rolling equipment shown in FIG. 4 includes a continuous casting (CC) conveying table 2, a soaking furnace 7. The rolling line roller table 5 is mechanically connected to perform direct rolling. In other words, continuously cast billets.

The material is cut into a predetermined length using a CC hot shear or a gas cutter 1, and sent to a collection table 9 via a conveyance table 2. Then, the rolls are taken out one by one from the stacking table 9, enter the soaking furnace 7, and are conveyed to the rolling line roller table 5.

At this time, if the rolling production amount Q r > continuous casting production amount Qc, the billet flows normally from the continuous casting equipment to the rolling equipment and there is no problem, but if Qr < Qc, the billet Since the excess overflows, at that time, a bushing 3, a delivery skid 4, and a forklift 6 are provided in front of the soaking furnace 7, and the bushing 3 is operated at the discretion of the supervisor to cut out the steel pieces and push them onto the skid 4. A forklift 6 is used to pile up the steel pieces at a collection point (not shown) outside the production line.

Furthermore, as shown in FIG. 5, there is a semi-direct rolling method in which continuous casting equipment and rolling equipment are connected by a forklift 6.

In this method, since the accumulating table 9 and the rolling line conveyance table 10 are separated, a payout skid 4 is provided on the side of the accumulating table 9 via a conveyor 8, and a forklift 6 is used from there to convey the steel pieces to the rolling line. table 10
I am trying to transfer it to. In this case as well, Q r <
At the time of Qc, the amount transferred to the rolling line conveyance table 10 by the forklift 6 is limited, and the remaining steel pieces are piled up in a steel piece collection area (not shown).

(Problems to be Solved by the Invention) However, in the above-mentioned direct rolling and semi-direct rolling, the following (1) inevitably occurs.

Due to the technical problem (2), it is difficult to mechanize and electrically control the connection between continuous casting equipment and rolling equipment.

(1) The number of steel slabs collected on the stacking table 9 does not always match the number of CC strands, and the number of stacked steel slabs fluctuates due to fluctuations in the casting speed of each continuous casting machine, etc. By the time the steel slabs in one row on the entry side of the conveyance table 2 that are sent in rows reach the accumulation table 9, the steel slabs on the entry side of the other row of the transport table 2 have been transferred to the steel slabs waiting on the exit side. In the case of a rear-end collision, the steel pieces in that one row will not exist on the accumulation table 9.

(2) The transportation time from the CG hot shear or gas cutter 1 to the cutting table 5 is not constant: In other words, the time changes due to the change in the number of steel pieces in (1) above,
The conveyance time varies due to variations in the steel billet drawing speed of the CC.

Therefore, in the above-mentioned direct rolling and semi-direct rolling, the control of Qc=Qr must depend on human judgment, and a constant supervisor is required. Also 1
There is a high risk that an error in judgment will lead to an accident. Furthermore, since the surplus steel pieces are transported by a forklift, a worker is required at all times, and the method involves dangerous work using a forklift.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a method that can automatically control the flow of steel billets from a conveyance table to a rolling line roller table in direct rolling.

(Means for Solving the Problem) In order to achieve the above object, the present inventor has developed a billet transfer device based on the average conveyance time of a plurality of billets when directly conveying them from a stacking table to a rolling facility. control, and then compared with the rolling cycle, it was found that it is possible to directly send only the required steel pieces to the rolling equipment, and based on this knowledge, the present invention was made.

In other words, the gist of the present invention is that the slabs taken out from the continuous casting machine are cut by a cutting machine, once collected into groups, and then, if the rolling line is normal, transported to the rolling line and rolled. A rolling line and an unloading line are installed behind the continuous casting line so that if there is an abnormality in the line or there is surplus material in the slab, it will be taken out to the unloading line. Alternatively, in a direct rolling facility in which a cut-out device capable of conveying each group is installed at the connection point of the continuous casting line, rolling line, and unloading line, the billet flow time from the cutting machine to the cut-out device is determined, and the rolling cycle is A billet flow for direct rolling, which is characterized by predicting whether or not there will be any steel billets left for direct rolling, and based on this, determining the line to which the billets should be conveyed and controlling the operation of a cutting device. There is a control method.

(Example) The present invention will be described in detail below based on an example with reference to FIGS. 1 to 3.

1 is a CC hot shear or a gas cutter, and 2 is a conveyance table, and these structures are the same as those of the conventional ones.

An accumulation table 9 is installed downstream of the conveyance table 2, and a conveyor 8 is disposed on the accumulation table 9 in a direction perpendicular to the conveyance table 2.

A cutting table 11 is provided on an extension of the conveyor 8, and a cutting device 12 is provided near a connecting portion between the conveyor 8 and the cutting table 11.

A lifting rail 13 is provided at an appropriate position in the middle of the cutting table 11 and perpendicular thereto. This lifting rail 1
A rolling line roller table 5 extends from one end of the cutting table 11 in a direction perpendicular to the cutting table 11, and the rolling line roller table 5 is arranged one step lower than the cutting table 11.

The lifting rail 13 is configured to be able to move up and down so that its upper limit is at the same level as the cutting table 11 and its lower limit is at the same level as the rolling line roller table 5.

The cutting device 12 may be of any type, but for example, as shown in FIG.
5, a plurality of bushing pawls 16 which are rotatably provided on the sliding body and can be retracted and retracted by raising and lowering on the surface of the cutting table 11, and a hydraulic cylinder 17 for operating the sliding body 15.

Link mechanism 1 connecting hydraulic cylinder 17 and sliding body 15
It consists of 8. The cutting device 12 can move one pitch so that the steel pieces can be placed one by one on the lifting rail 13, and can also move over a large stroke in order to send out the steel material beyond the lifting rail 13. It is configured as follows.

(Operation) Next, the operation of the flow control of the steel billet according to the present invention will be explained.

A steel billet taken out from the continuous casting equipment is cut into a predetermined size by a CC hot shear (or gas cutter) 1, conveyed in the longitudinal direction by a conveyance table 2, and placed on an accumulation table 9. At this time, steel billets are sent from the strand of the continuous caster, but the number of steel billets collected on the accumulation table 9 does not always match the number of strands of the continuous caster. For example, in FIG. 1, a piece of steel is waiting on the exit side of the conveyance table 2, and by the time a cut piece of steel A reaches position B on the accumulation table 9, another piece of steel C is waiting. You may end up colliding with a waiting piece of steel. In such a case, the conveyor 8 is driven so that the steel piece C does not collide with the steel piece, and the steel piece is moved to the cutting table 11.

In this way, the next material signal is output when the cutting of the last steel billet among the steel billets that can reach the accumulating table 9 before a certain steel billet collides with a waiting steel billet is completed. When this final piece of steel arrives at the collecting table 9, the number of pieces of steel on the collecting table 9 is stored as n.

Below, each device is operated according to the flowchart shown in FIG.

First, the conveyor 8 transports a group of steel slabs to the cutting table 11. When the steel piece arrives at the cutting table 11, a timer is set and the time until the next material signal is measured as Tn. Then, this timer value Tn is stored in memory at the time when the next material signal forming the next group is output. Then, the time required from the completion of cutting the final steel billet (output of the next material signal) to the arrival of the steel billet at the cutting table 11 is T.
1. The rolling cycle, that is, the rolling time per roll is T
As a, calculate (T□+Tn)/n, and T. Compare with.

In addition, in this transport facility, T1>T, and the capacity and equipment arrangement of each device are as follows.

When (T□+Tn)/n≧T, this is the rolling production amount Qr
≧Indicates a state where the continuous casting production amount Qc, and the steel billets normally flow from the continuous casting equipment to the rolling equipment. Therefore.

Check whether the rolling line is normal, wait for the material request signal of the rolling line to turn ON, lower the lifting rail 13, feed the cutting device 12 by one pitch,
A steel piece is cut out onto a rolling line roller table 5. Also, at this time, the number n of steel pieces is stored in the memory N, and this memory N, that is, n, is compared with the number n0 of pieces to be cut out. no<
If N, return to the beginning of the normal operation and continue the cutting operation. When the cutting number n0 reaches n,=N, the cutting device is stopped.

Tyu+Tn/n<T. When Qr<Qc,
Because the billets cannot be sent to the rolling line.

The lifting rail 13 is raised, the cutting device 12 is advanced to its forward limit, and the steel piece is moved to the cooling table or heat retention furnace 14 located beyond the lifting rail 13.

Thereafter, the cutting device 12 is moved back to the retreat limit and waits for the next group of steel pieces.

With this kind of control, each device is automatically and continuously operated to automatically control the flow of steel billets.

(Effects of the Invention) As described in detail above, according to the present invention, various facilities for conveying, stacking, and cutting out steel billets in a specific arrangement are connected in consideration of continuous casting production volume, billet flow time, rolling cycle time, etc. Since the flow of the billet is automatically controlled, efficient direct rolling is possible, and manpower can be reduced, so production costs can be reduced. Furthermore, since no equipment such as a forklift is required, dangerous work can be eliminated, which is also effective from the standpoint of safety management.

[Brief explanation of drawings]

Fig. 1 is a diagram schematically showing various equipment used in carrying out the method of the present invention and their arrangement. Fig. 2 is a diagram showing a cross section taken along the line xx in Fig. 1, and mainly shows the cutting device among the above-mentioned installations. Side sectional view. FIG. 3 is a flowchart of billet flow control according to an embodiment of the present invention, and FIGS. 4 and 5 are diagrams showing the arrangement of various equipment for conventional direct rolling or semi-direct rolling, respectively. 1...CC hot shear (gas cutter), 2...Transport table. 5... Rolling line roller table, 8... Conveyor, 9... Accumulating table. 11... Cutting table, 12... Cutting device. 13... Lifting rail, 14... Cooling stand (heat retention furnace), 15... Sliding body. 16... Butsusha claw, 17... Hydraulic cylinder, 18... Link mechanism. Patent applicant Hisashi Nakamura, patent attorney representing Kobe Steel, Ltd. Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] The slabs taken out from the continuous caster are cut by a cutting machine, and once collected into groups, if the rolling line is normal, they are transported to the rolling line, and if the rolling line is abnormal or there is excess material in the slabs. A rolling line and an unloading line are installed at the rear of the continuous casting line so that when the rolls are taken out to the unloading line, this line is switched, and the rolling line is equipped with a cutting device that can transport one piece at a time or in groups. In the direct rolling equipment installed at the connection point of the continuous casting line, the rolling line, and the carry-out line, the flow time of the billet from the cutting machine to the cutting device is determined, and the amount of billet sent directly to rolling is determined in comparison with the rolling cycle. A method for controlling the flow of a steel billet for direct rolling, comprising predicting whether or not the steel billet will be transported, and determining a line to which the billet should be conveyed based on the prediction, and controlling the operation of a cutting device.