KR19980026187A - Coil box device for continuous rolling with bypass rolling - Google Patents

Abstract

The present invention, in the hot-rolling process of steelmaking, by winding the hot-rolled sheet online after rough rolling, just before finishing rolling, minimizes the temperature variation of the head and tail portions of the hot-rolled sheet, and uses a continuous slab using a short slab. It solves the problem of misalignment of process manufacturing schedule, such as when producing hot-rolled hot rolled plate, and can maintain the insulation and heating function and buffer function of the hot rolled plate wound in the layout of existing hot-rolled process, and 100% continuous rolling work rate An object of the present invention is to provide a coil box device for continuous rolling that can be bypass rolled as much as possible. The apparatus of the present invention for this purpose, the three-vendor roll 11 is installed to swing so that the lower roll in the rolling pass line when the bypass hot rolling, and is driven on the line 60 during the coiling operation and bypass hot rolling Cradle rolls (12a, 12b, 12c) is installed so as to move up and down to move to the rolling pass line 70 to act as a table roller; Heating mechanisms 22a and 22b heated to maintain a constant temperature are provided on the ceiling, and a coil car 14 is installed at the bottom to move the hot rolled coil, and made of a material that can withstand high temperatures. Compartment-shaped buffering crack furnace 19 made of a steel structure (21); The coiling station is loaded with a hot rolled coil in the coiling station and comprises a coil car 14 which is movably installed in the buffering crack through the passageway 20, and is configured to connect the rough rolling process and the finishing rolling process in a straight line.

Description

Coil box device for continuous rolling with bypass rolling

The present invention minimizes the temperature variation of the head and tail portions of the hot rolled sheet by winding the hot rolled sheet on-line immediately after rough rolling and immediately before finishing rolling in the hot rolling process in the continuous rolling technology of steelmaking. At the same time, it is possible to solve the problem of mismatch in the process manufacturing schedule such as when producing hot rolled sheet by continuous continuous rolling technology using short slab, and the wound coil moves to the finishing rolling stage. It is possible to keep the heating and heating function and buffering function of the hot rolled sheet wound during the time before the continuous rolling, which enables bypass rolling with 100% continuous rolling operation rate in the layout of the existing hot rolling process. It relates to a coil box device.

In the conventional rolling process of the hot rolling mill, the rolling force of the tail part dropped during acceleration rolling is weighted up to about 80% compared to the head part, and this extra rolling force loss and the temperature drop of the tail part are reduced. To prevent this, the area of thermal radiation is reduced to 30: 1 by winding the hot rolled sheet, and a coil box was developed to change the tail portion and the head portion during the coiling and uncoiling station process. It became. Coil box can reduce the investment cost of equipment by shortening the length of hot rolling process, and can act as a buffer in the case of post process equipment during continuous rolling, and maximize the cracking effect to secure good temperature distribution. And by preventing the temperature drop phenomenon of the edge (Edge) it is possible to reduce the material variation in the width and length direction and to excellently reduce the thickness variation.

However, the coil box of Stelco, Canada, which has the characteristics that the beginning and the end of the process lie in a straight line so that it can be easily applied to the existing consistent hot rolling process, can be rolled up without a mandrel. It is manufactured but does not have a heating and heating device, and also does not have a buffer function of the coil.

As another conventional technique, Mannesmann Demag's coil box, which is designed to buffer up to five hot rolled coils, allows for the storage of hot rolled coils between the coiling station and the uncoiling station. Holding Furnace is installed at right angles to the flow line of the process, which requires a lot of installation space and bypass rolling, which can be directly hot rolled without coiling during continuous continuous rolling of short slabs. It has a structure where the addition of functions is absolutely impossible.

On the other hand, the coil box for continuous rolling is a three-position coil box of Chiba Steel Works of KSC, Japan, which has been applied to the continuous rolling process recently, but bypass rolling of short slabs is not possible and the coil is not available. Unmatched ring time, uncoiling time and welder welding time makes it impossible to continuously roll 100% and has only one coil buffer function.

Referring to the problems of the prior art with reference to the drawings, Figure 1 is shown to show the concept of coiling and uncoiling in the continuous rolling process of the prior art, Figure 2 is a coil box in the prior art hot rolling process 1, in the prior art, the hot rolled coil 10 is wound in the initial position (I) via the three-vendor roll 11 and then moved to the intermediate position (II) to the first cradle. After being mounted on the roll 12a, it was moved to the continuous position (III) while being uncoiled and continued to be uncoiled, and the hot rolled coil was continuously wound at the initial position (I). Such coil box type has the rough rolling process and the finishing rolling process in a straight line, but the continuous continuous rolling process under the condition that the coil box is not used, that is, the problem that bypass hot rolling is impossible, mismatching of the play-hot rolling process, and equipment accident The problem that there is no buffer function of the hot rolled coil, and even if the equipment before the finishing mill 200 is expanded, the problem remains difficult to connect with the existing rolling equipment.

In addition, in the coil box used for the hot rolling process in the prior art as shown in FIG. 2, after coiling the hot rolled coil 10 in the coiling station 13, the coil car which reciprocates in a direction perpendicular to a rolling pass line is carried out. After being loaded onto 14, it is moved into the holding furnace 15 and then conveyed to the uncoiling station 16, uncoiled and rolled. In this case, the holding furnace 15 may function as a buffer, but since the rough rolling pass line 30 and the finishing rolling pass line 40 are not on the same line, the continuous slab of the short slab slab may be continuously There is still a problem that bypass hot rolling is not possible and the trailing coil is not mounted to the uncoiling station 16 until the preceding coil is completely uncoiled, making it difficult to secure time for continuous rolling.

The present invention has been made to solve the problems of the prior art described above, in the hot rolling process of steelmaking to minimize the temperature deviation of the head portion and tail portion of the hot rolled sheet by winding the hot rolled sheet online after rough rolling just before finishing rolling At the same time, it solves the problem of misalignment of process manufacturing schedule, such as when producing hot rolled sheet by continuous continuous rolling technology using short slab, and keeps the warming and heating function of the hot rolled sheet in the layout of existing hot rolled process and buffers it. It is made possible, and an object of this invention is to provide the coil box apparatus for continuous continuous rolling by which bypass rolling which is 100% of continuous continuous rolling work rates is possible.

In order to achieve the above object, the present invention, a three-vendor roll installed to swing so that the lower roll in the rolling pass line during the bypass hot rolling; Cradle rolls which are driven on the ship during the coiling operation and installed up and down to move to the rolling pass line to act as a table roller during bypass hot rolling; A heating mechanism that is heated to maintain a constant temperature is provided on the ceiling, and the coil car is installed at the bottom to move the hot rolled coil, and has a compartment shape made of a refractory iron structure made of a material that can withstand high temperatures. With buffering cracks; It consists of a coil car installed in the coiling station to move the hot rolled coil to the buffering crack through the passage door, and the continuous rolling coil capable of bypass rolling configured to connect the rough rolling process and the finishing rolling process in a straight line. Provide a box device.

1 is a conceptual diagram of coiling and uncoiling in the continuous rolling process of the prior art,

2 is a view schematically showing a coil box in a prior art hot rolling process,

3 is a view schematically showing a coil box device for continuous rolling capable of bypass rolling according to the present invention;

4 is a cross-sectional view taken along the line A-A of the buffering crack furnace constituting the apparatus of the present invention shown in FIG.

5 is a side view of the coiling and uncoiling station constituting the apparatus of the present invention.

* Description of the symbols for the main parts of the drawings *

10: hot rolled coil 11: three-bender roll

12: cradle roll 13: coiling station

14: coil car 15: holding road

16: uncoiling station 19: buffering crack

20: passage door 21: refractory steel structure

22: gas burner 23: filler

30: crude rolling pass line 40: imaginary rolling pass line

50: coiling and uncoiling station

70: rolling pass line 100: rough rolling machine

200: rolling mill

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a coil box apparatus for continuous rolling rolling in which bypass rolling of the present invention is possible will be described in detail with reference to the accompanying drawings showing preferred embodiments.

3 is a view schematically showing a coil box device for continuous rolling capable of bypass rolling according to the present invention, FIG. 4 is a cross-sectional view of a buffering crack furnace constituting the present invention device, and FIG. 5 shows the present invention device. It is a side view of the coiling and uncoiling station which comprises.

The apparatus of the present invention enables the bypass hot rolling and the buffer function of the hot rolled coil for the conventional linear hot rolling process, and the three-bender roll of the coiling station (Three) during the bypass hot rolling to enable 100% continuous rolling. The lower roll of the bender roll is swung to be placed in the rolling pass line, and the first cradle roll and the second and third cradle rolls are moved up and down on the ship to carry the coil during the coiling operation. Coil Car and Compartment capable of moving up to the rolling pass line to move as a table roller during bypass hot rolling, and to move the coil to the buffering position at the coiling station. Consists of a shaped buffering crack, which minimizes the temperature variation of the head and tail parts of the hot rolled sheet as well as the continuous rolling due to the difference in the production capacity of the straight play-hot rolling process. Solve the problem of crude sum manufacturing process schedule, and has a thermal insulation and cracks the heating function of the take-up the hot-rolled coils, characterized by a possible continuous soft work rate 100%.

As shown in FIG. 3, in the coil box apparatus for continuous rolling rolling capable of bypass rolling according to the present invention, the rough rolling process and the finishing rolling process are connected in a straight line, and when the hot rolled sheet is not wound during continuous continuous rolling ( In the a) part, the hot rolled sheet is bypassed and hot rolled through the coiling and uncoiling station 50, and when the hot rolled sheet is wound, the hot rolled coil 10 wound through the three vendor roll is rolled at the coiling station. The coil car 14 reciprocating in the direction perpendicular to the line is moved to the buffering crack furnace 19 to be rolled in sequence according to the rolling schedule. The coil car 14 is moved inside the buffering crack path 19. The coiling and uncoiling station 50 and the buffering crack furnace 19 are divided into refractory steel structures 21, and the passage door 20 therebetween is opened and closed by a position sensor. In addition, when the continuous casting-corolling process is expanded and connected to the existing finishing mill 200, it may be easily connected as shown in part (b) of FIG. 3.

In FIG. 4, a cross-sectional view taken along the line AA in FIG. 3A is shown. The refractory iron structure 21 of the compartment-type buffering crack furnace 19 can withstand high temperature heat. It is made of ceramic fiber, refractory brick, etc., and is designed to minimize the minimum space and heat loss to which the hot rolled coil 10 can move, and the gas burner as a heating mechanism is provided on the ceiling of the buffering crack furnace 19. 22a and 22b are provided to be heated so that the buffering crack path 19 can be maintained at a constant temperature, and the coil car 14 which is movable up and down is provided in the furnace top part of the buffering crack path 19.

5 is a side view of the coiling and uncoiling station 50, which is blocked by the refractory iron structure 21 in the same manner as the buffering cracking furnace 19 to secure the thermal insulation function, when the hot rolled sheet is wound The cradle rolls 12a, 12b, and 12c are driven on the line 60. The cradle rolls of the rear of the first cradle rolls 12a move up and down independently to move the coil 10 wound around the second cradle roll ( 12b), the rear cradle roll of the second cradle roll (12b) and the front cradle roll of the third cradle roll (12c) are respectively moved up and down to mount the hot rolled coil (10) to the uncoiling station. do. On the other hand, in the bypass hot rolling, the lower roll of the three bender roll 11 swings on the rolling pass line 70, and the cradle rolls 12a, 12b, 12c that are movable up and down are also moved to the rolling pass line 70. It moves and acts as a table roller, and the filler 23 of the uncoiling station moves to a position which does not interfere with the bypass hot rolling, so that the rolling can be performed without winding the hot rolled coil 10. do.

According to the coil box apparatus for continuous rolling rolling capable of bypass rolling of the present invention described above, the rolling equipment of the hot rolling process is updated, continuous, and high speed, while meeting the basic purposes of the existing coil box and continuous rolling equipment. Coil box device to improve the productivity and quality of hot rolled steel sheet by eliminating the problem of mismatch of continuous rolling schedule of the product, enabling 100% continuous hot rolling, and saving energy to reduce material variation and thickness variation In addition to providing a technique for manufacturing a type hot rolled steel sheet, a buffer function capable of flexibly coping with facility accidents in a coil box front and rear process can be provided to improve the standardization and simplicity of operation.

Claims (1)

During the bypass hot rolling, the three-bender roll 11 installed to swing so that the lower roll is placed on the rolling pass line 70, Cradle rolls 12a, 12b and 12c which are driven on the line 60 during the coiling operation and installed to move up and down to the rolling pass line 70 to act as a table roller during bypass hot rolling; The heating mechanisms 22a and 22b which are heated to maintain a constant temperature are provided on the ceiling, and the coil car 14 is installed at the bottom to move the hot rolled coil 10, and is made of a material that can withstand high temperatures. Compartment-shaped buffering crack furnace 19 made of a refractory steel structure 21 produced; It includes a coil car 14 mounted on the coiling station to move the hot rolled coil 10 to the buffering crack furnace 19 through the passage door 20, and the rough rolling process and the finishing rolling process in a straight line. Coil box device for continuous rolling capable of bypass rolling, characterized in that configured to connect.