JPH01224102A - Facility for continuous casting and rolling of thin sheet - Google Patents

Abstract

PURPOSE:To temporarily store a stock and to improve the operating ratio by installing an emergency looper between a thin sheet continuous casting machine and a rolling mill not to stop casting at the time of emergency stop of succeeding devices to the casting machine in a thin sheet continuous casting facility. CONSTITUTION:An emergency looper 6 consists of fixed rollers 6-1, 6-3, moving rollers 6-2, a moving device 6-4, and a motor 6-5. The moving rollers 6-2 transfer a stock from a continuous casting machine 1 to a preparatory device 2. If any stopping cause is generated, a flying shear 3 and the emergency looper 6 are actuated and a continuous rolling mill 4 and the fixed roller 6-3 stop together after the stock passes through. Then, the motor 6-5 is actuated, the moving rollers 6-2 move upward by action of the moving device 6-4, and operation of the mill 4 and succeeding devices restart. The rollers 6-2 gradually move down to deliver a stock 7 stored in the looper 6 and operation of the looper 6 stops at the time of the rollers 6-2 return to the initial position. Hence, the machine 1 is not necessarily stopped at the time of such a short operation stop of the mill 4.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to continuous thin plate casting and rolling equipment, and in particular, an emergency looper is provided between a continuous casting machine and a continuous rolling mill, which is suitable for improving operation rate and product yield. Concerning continuous casting and rolling equipment.

[Conventional technology]

FIG. 1 is a schematic cross-sectional view of a conventional thin plate continuous casting and rolling equipment. Mainly continuous casting machine1. Pretreatment equipment consisting of scale breakers, etc. 2. It consists of a running shear 3° continuous rolling mill 42 and a winding machine 5. Moreover, the continuous casting machine 1 mainly has a pot 1-
1. Nozzle 1-2° Coagulation device 1-3. Guide roller 1-
Consists of 4 etc. The flow rate of the liquid material (steel, aluminum, etc.) in the bot 1-1 is controlled by the nozzle 1-2, and the material is cooled by the solidifying device 1-3 and solidified from the surface. A guide roller 1- consisting of a large number of rollers is made of material formed into a plate shape.
4 and comes out of the casting machine 1.

Thereafter, the surface and side surfaces are treated by pretreatment equipment 2 such as a scale breaker, and then the product enters a continuous rolling mill 4.

The continuous rolling mill 4 is composed of a plurality of rolling mills and rolls a cast plate to a finished plate. The product coming out of the continuous rolling mill 4 is wound up into a predetermined size by a winding machine 5.
The rolling mill is made up of two or more machines, and the rolling shear 3 cuts the material into appropriate lengths and alternately winds the material without stopping the continuous rolling mill 4.

[Problem to be solved by the invention]

This is because in the conventional equipment mentioned above, everything from the continuous casting machine 1 to the winding machine 5 is very tightly continuous.

There was a problem when the continuous rolling mill 4 and subsequent mills stopped for some reason. In other words, when the stoppage time is short, the material coming out of the pretreatment equipment 2 is continuously cut into scraps using the running shear 3, and when the stoppage time is long, the nozzle 1-2 of the casting machine 1 is closed. Methods such as stopping casting were taken.

However, once casting is stopped, it takes time to restart casting, depending on the characteristics of the casting machine, and there is a large loss until stable casting can be continued. Even if it is stopped for a short time, there is a lot of loss as it is scrapped due to shear during running.

As described above, in conventional equipment, if a trouble occurs after the first rolling process, production is often hindered due to a decrease in the operating rate and a decrease in yield, regardless of the length of the stoppage time. An object of the present invention is to enable rolling to be restarted immediately without stopping the continuous casting machine 1 even if the continuous rolling mill 4 and subsequent parts are stopped for a short time.

[Means to solve the problem]

In many cases, the continuous rolling mill 4 and subsequent stops are relatively short-term. For example, roll replacement or sensor replacement.

This is a trip caused by exceeding the limit value (current, voltage, etc.) of the drive device. These can be restarted after being stopped for about 2 to 3 minutes. During this time, in order to continue without stopping the continuous casting machine, an emergency looper is provided between the continuous casting machine 1 and the pretreatment equipment 2 to temporarily hold the cast thin plate.

〔Example〕

An embodiment of the present invention will be explained with reference to FIG. Reference numeral 6 denotes an emergency looper according to the present invention, which is installed between the continuous casting machine 1 and the pretreatment equipment 2. As shown in the figure, the emergency looper 6 includes an inlet fixed roller 6-1. Exit fixed roller 6-3. Moving roller 6-2. It consists of a moving device @6-4 and an electric motor 6-5. Normally, the moving roller 6-2 is located at the position indicated by the solid line in the figure, that is, at the home position, and has the role of bridging the material from the continuous casting machine 1 to the pretreatment installation 2. However, if some stopping factor occurs, first a start command 9 is given, and the running shear 3 and emergency looper 6 are activated, and at the same time, the continuous rolling mill 4 is stopped after the material has passed. The exit fixed roller 6-3 also stops. When the starting command 9 is given, the electric motor 6-5 is started and the moving roller 6-2 starts moving upward by the action of the moving device 6-4. As long as the material 7 is continuously fed from the continuous casting machine 1, the moving roller 6-2 continues to rise as shown by the dotted line in FIG. On the other hand, the torque of the electric motor 6-5 is controlled so that a tension exceeding a specified value does not act on the material 7. After the preparation is completed, the continuous rolling mill 4 and the subsequent rolling mills including the fixed roller 6-3 are restarted. In order to remove the material 7 stored in the emergency looper 6, the continuous rolling mill including the fixed roller 6-3 is operated at a speed 20 to 30% higher than the original speed, and the moving roll 6-2 is gradually lowered. Continue until you return to the home position. The emergency looper 6 stops operating upon returning to the home position. In addition, the emergency looper may be provided with a burner 6-6 to function as a soaking furnace in order to keep the temperature of the rolling mill 7 uniform and ensure a metallurgically uniform crystal structure. Particularly when the continuous rolling mill 4 is stopped and the emergency looper is storing material, it is necessary to uniformly heat the material with the burner 6-6 so that the material does not get cold.

〔Effect of the invention〕

According to the present invention, when the continuous rolling mill is stopped for a short time, the material is temporarily stored without stopping the continuous casting machine 1 and discharged when the continuous rolling mill is restarted, thereby improving the operating rate and yield. For example, it can be calculated as follows.

(1) Casting machine: 30m + thickness XX 1000v width, speed 20
m/win (2) Rolling mill exit side: 1-thickness x 1000mm width, speed 60
0m/m1n (3) Winding machine: Coil inner diameter 500m φ, outer diameter 150
0Iφ In the case of the above operating specifications, it takes approximately 1 to produce one coil.
It is 0 minutes. , 48 coils can be produced per 8 hour shift. If there were 4 rolling stops of 5 minutes per 6 rolls per shift, conventionally the material for 2 coils would have been scrapped, but according to the present invention, □X100" = 4%:
It is possible to improve the yield by about 4%. Furthermore, once casting is stopped, it takes 30 minutes or more to restart, resulting in a significant drop in operating efficiency, but by providing the emergency looper of the present invention, this risk can be significantly reduced. In other words, when the rolling mill is likely to be stopped for a relatively long time,
If you use a combination of three methods, such as using an emergency looper, reducing the casting speed to -, and cutting scraps with an inter-travel shear, you can avoid stopping casting even when rolling is stopped for about 30 minutes.
Moreover, by minimizing scrap, it is also possible to take measures to prevent a decrease in operating rate and yield.

On the other hand, how much capacity is required for an emergency louver?
Taking the above conditions (1) and (2L (3) as an example, 2
0 m/m1nX 5m1n=140 m storage is required. If this is absorbed by the loop of article 20, then 1
0 moving rolls are required resulting in a 5m high loop. -If the book roll diameter is 500Iφ, the total length of the emergency looper is L=5001! IIIφX (10+12) books +
a ~ 11,000 m + a = 14 ~ 15 m, height H = 5 m + α = about 7 m. Of course, if the stop time is halved to 2.5 minutes instead of 5 minutes, the above amount can be reduced by half. How to do it depends on the setup cost and yield.

It should be determined based on the utilization rate.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional continuous casting and rolling equipment, and FIG. 2 is a schematic diagram of a continuous casting and rolling equipment according to the present invention. DESCRIPTION OF SYMBOLS 1... Continuous casting machine, 2... Pretreatment equipment, 3... Running shear, 4... Continuous rolling mill, S... Winding machine, 1-
DESCRIPTION OF SYMBOLS 1... Pot, 1-2... Nozzle, 1-3... Coagulation device, 1-4... Guide roller, 6... Emergency looper, 6-1... Inlet fixed roller, 6 -2... Moving roller, 6-3... Exit fixed roller, 6-4... Moving device, 6-5... Electric motor, 6-6... Burner, 7...
- Rolling mill, 8... Finished product, 9... Start command.

Claims (1)

[Claims] 1. In a thin plate continuous casting facility equipped with a continuous casting machine (1) that casts thin plates, a continuous rolling mill (4) that rolls the cast thin plate to the thickness of the finished product, and a winder (5) that winds up the rolled product. ,
Fixed rollers (6-1) and (6-
3) An emergency looper (6) consisting of a moving roller (6-2), a moving device (6-4), and an electric motor (6-5) is installed between the continuous casting machine (1) and the continuous rolling mill (4). Continuous thin plate casting and rolling equipment featuring the following features: