KR100286607B1 - Coil box device for endless rolling enabling bypass rolling - Google Patents

Abstract

PURPOSE: A coil box device for endless rolling enabling bypass rolling is provided which not only minimizes a temperature deviation between head and tail parts of a hot rolled strip but also solves non-matching of process manufacturing schedules during manufacturing of a thick hot rolled strip by on-line coiling the strip right before the finish rolling. CONSTITUTION: The coil box device for endless rolling enabling bypass rolling comprises three bender rolls(11) in which three bender rolls are swung so that a lower roll(17) is put on a rolling pass line(70) during bypass hot rolling; cradle rolls(12a,12b,12c) which are vertically movably installed so that they are driven on a line(60) during coiling, and they are moved to the rolling pass line(70) so as to act as a table roller during bypass hot rolling; a compartment shaped buffering soaking pit at the ceiling of which heating devices to be heated are equipped so as to maintain a certain temperature, at the lower part of which a coil car(14) is installed to move a hot rolled coil(10), and which is consisted of a refractory structure(21) made of a high temperature resistant material; and a coil car(14) installed so that it is moved to the buffering soaking pit through a passage gate after loading the hot rolled coil(10) on it in a coiler, wherein skin-pass mill is connected to the finish rolling mill in a straight line.

Description

Coil box device for endless rolling capable of bypass rolling

The present invention minimizes the temperature deviation between the head portion and the tail portion of the hot-rolled sheet by winding the hot-rolled sheet on-line immediately before the hot rolling after the rough rolling in the hot rolling process in the steel endless rolling technique It is possible to solve the problem of mismatch of the manufacturing schedule such as the production of the hot rolled steel sheet by using the endless rolling technique by using the flat slab at the same time, The present invention relates to a coil box device for endless rolling capable of bypass rolling capable of performing heat treatment, heating and buffering of a hot rolled sheet during a time period, will be.

In the hot rolling process of the conventional hot rolling mill, the rolling force of the tail portion, which is drastically reduced during acceleration rolling, is increased to about 80% as compared with the head portion. This extra rolling loss and the temperature drop Coil Box was developed to reduce the heat radiation area to 30: 1 by winding the hot-rolled sheet and to change the tees and heads in the winding and uncoiling station . By reducing the length of the hot-rolling process, the coil box can reduce the investment cost of the equipment. In addition, it can serve as a buffer in the case of the post-process equipment in the case of continuous rolling and maximizes the cracking effect to secure a good temperature distribution And the edges are prevented from dropping in temperature, it is possible to reduce the material deviation in the width and length direction and to reduce the thickness deviation to an excellent level.

However, Canel Stelco's coil box, which has the feature that the start and end of the process are placed in a straight line, is easy to apply to the existing integrated hot rolling process, so that the hot-rolled sheet can be wound without mandrel It is a device that has been manufactured but has no heating and heating device and also has no buffering function of coil.

As another conventional technique, a coil box of Mannesmann Demag Co., which is designed to have a capability of buffering a maximum of five hot-rolled coils, is held between the winding device and the unwinding device so as to hold the hot- (Holding Furnace) is installed perpendicular to the flow line of the process, requiring a lot of space for installation. Bypass rolling function that can be hot rolled immediately without coiling in the endless rolling of slabs is absolutely impossible. It has an impossible structure.

On the other hand, as a coil box for endless rolling, there is a 3-position coil box of a Chiba steel mill of KSC (KSC) which is currently being applied to the endless rolling process. However, bypass rolling of a round slab is impossible, Due to the time and uncoiling time, and the time required for the bonding of the welder and the uncompensated, 100% endless rolling is not possible, and only one common buffer function is available.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagrammatic view of the prior art problem of coiling and uncoiling of the prior art rolling process; Fig. 1 shows a coil box in a prior art hot rolling process; Fig. As shown in FIG. 1, in the prior art, the hot-rolled coil 10 is wound at the initial position I via the three-bender roll 11 and then moved to the intermediate position II, (12), then moved to the continuous position (III) while being uncoiled, and is continuously uncoiled, and in the initial position (I), the hot-rolled coil was continuously wound. This type of coil box can be roughly divided into rough rolling process and rough rolling process, but it is impossible to perform continuous rolling process such as bypass rolling process under the condition that coil box can not be used, There is still a problem that it is difficult to connect with the existing rolling mill even if the problem of not having a buffer function of the hot-rolled coils and extending the facilities before the finishing mill 200 is present.

2, in the coil box used in the hot rolling process in the conventional technique, after the hot-rolled coil 10 is wound in the winding device 13, the coil box 10 which is reciprocating in the direction perpendicular to the rolling pass line 14 and then into the holding furnace 15 and then conveyed to the unwinding device 16 and uncoiled and rolled. In this case, the holding furnace 15 can perform the function of the buffer. However, since the rough rolling pass line 30 and the finishing rolling pass line 40 are not on the same line, Pass hot rolling can not be performed and the trailing coil can not be attached to the unwinding device 16 until the leading coil is completely uncoiled so that it is difficult to secure time for endless rolling.

The present invention has been made to solve the problems of the above-described prior arts, and it is an object of the present invention to minimize the temperature deviation between the head portion and the tail portion of the hot rolled sheet by winding the hot rolled sheet on- And at the same time eliminates the problem of undecomposition of the process schedule such as the production of the hot rolled plate by the endless rolling process using the round slab and also acts as a buffering function of the hot rolled sheet wound in the layout of the existing hot rolling process And capable of bypass rolling capable of achieving an endless rolling operation rate of 100%.

In order to achieve the above object, the present invention provides a three-roll bending machine, comprising: a three-bender roll (11) having three bender rolls swing so as to place a lower portion (17) in a rolling pass line (70) during bypass hot rolling; Cradle rolls (12a, 12b, 12c) mounted on the line (60) during the coiling operation and vertically movable to move to the rolling pass line (70) for acting as a table roller during bypass hot rolling; A heating device 22a or 22b heated to maintain a predetermined temperature is provided on the ceiling and a coil car 14 is installed on the bottom to move the hot-rolled coil 10, A buffering cracking furnace 19 in the form of a compartment made of the manufactured refractory structure 21; And a coil car (14) loaded on the hot rolling coil (10) in the winding device (13) and provided so as to be movable to the buffering crack path (19) through the passage door (20) A coil box device for endless rolling capable of bypass rolling configured to connect processes in a straight line.

FIG. 1 is a conceptual diagram of winding and unwinding of the endless rolling process of the prior art,

FIG. 2 schematically shows a coil box in the hot rolling process of the prior art; FIG.

FIG. 3 schematically shows a coil box device for endless rolling capable of bypass rolling according to the present invention, FIG.

4 is a cross-sectional view taken along line A-A of the buffering crack constituting the inventive device of FIG. 3,

5 is a side view of the winding and unwinding device constituting the inventive device.

Description of the Related Art

10: hot-rolled coil 11: three-bender roll

12: Cradle roll 13: Winding device

14: Coil car 15: Holding ro

16: unwinding device 17: lower roll

19: with buffering cracks 20: passage door

21: refractory steel structure 22: gas burner

23: filler 30: rough rolling pass line

40: finishing rolling pass line 50: winding and unwinding device

70: rolling pass line 100: rough rolling mill

200: finishing mill

Hereinafter, a coil box device for endless rolling capable of bypass rolling according to the present invention will be described in detail with reference to the accompanying drawings which show preferred embodiments.

Fig. 3 is a view schematically showing a coil box device for endless rolling capable of bypass rolling according to the present invention, Fig. 4 is a sectional view of a buffering crack furnace constituting the present inventive device, Fig. 5 is a cross- And Fig. 7 is a side view of the winding and unwinding device.

The apparatus of the present invention is capable of buffering the bypass hot rolling and hot rolling coils for a conventional hot rolling process, and in the case of bypass hot rolling to enable 100% endless rolling, the three- the lower rolls 17 of the three bender rolls 11 are swung to rest on the rolling pass line and the first and third cradle rolls and the third and fourth cradle rolls And is movable upwardly and downwardly in a line for conveying and is moved up and down by the rolling pass line 70 so as to act as a table roller during bypass hot rolling, A coil car 14 and a buffering crack furnace in a compartment shape so as to minimize the temperature deviation between the head and tail portions of the hot rolled steel sheet and to improve the production capacity of a straight- Yen by It is possible to solve the unfixed problem of the process schedule at the time of rolling and to have a function of heating and cracking the wound hot-rolled coil and endless work rate of 100%.

As shown in FIG. 3, in the coil box apparatus for endless 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. When the hot- The hot-rolled coil is wound on the three-bender roll 11 at the time of winding the hot-rolled sheet, and the hot-rolled coil 10 is rolled in the winding device 13, Is moved to the buffering crack path (19) by the coil car (14) reciprocating in the direction perpendicular to the pass line and is rolled in order in accordance with the rolling schedule. Then, it is moved by the coil car 14 in the buffering crack path 19. The winding and unwinding device 50 and the buffering cracking furnace 19 are divided into a refractory steel structure 21 and a passage door 20 between them is opened and closed by a position sensor. When the continuous casting-rough rolling process is installed and connected to the conventional finishing mill 200, it can be easily connected as shown in (B) of FIG.

A refractory steel structure 21 of a compartmentalized buffering cracking furnace 19 is constructed to withstand a high temperature heat, Ceramic fiber and refractory bricks and is designed so as to minimize heat loss and the minimum space in which the hot-rolled coil 10 can be moved. In the buffering cracking furnace 19, a gas burner 22a and 22b are installed so that the buffering crack path 19 can be maintained at a constant temperature and a coil car 14 is provided on the roger portion of the buffering crack path 19 so as to be movable up and down.

5 is a side view of the winding and unwinding device 50. In order to ensure a thermal insulation function, it is blocked by the refractory steel structure 21 like the buffering cracking furnace 19, The cradle rolls 12a, 12b and 12c are driven on the first and second cradle rolls 12a and 12b and the cradle rolls 12a and 12b on the rear side of the first cradle roll 12a are independently moved up and down, The rear cradle roll of the second cradle roll 12b and the front cradle roll of the third cradle roll 12c independently move up and down so that the hot-rolled coil 10 is mounted on the unwinding device 16. [ On the other hand, during bypass hot rolling, the lower roll 17 of the three-bender roll 11 swings to the rolling pass line 70 and the vertically movable cradle rolls 12a, 12b, 70 so as to act as a table roller and the filler 23 of the unwinding device 16 is moved to a position not to be obstructed by the bypass hot rolling so that the hot-rolled coil 10 is not wound, It becomes possible to roll.

As described above, according to the coil box apparatus for endless rolling capable of bypass rolling according to the present invention, since the rolling facility of the hot rolling process is up-to-date, continuous and high-speed, it meets the basic purpose of the existing coil box and endless rolling facility, An energy-saving hot-rolled steel sheet capable of 100% endless hot rolling as a coil box device for improving the productivity and quality of hot-rolled steel sheet by eliminating the unfixed problem of the rolling schedule and capable of reducing material deviation and thickness deviation It is possible not only to provide a manufacturing technology but also to provide a buffer function capable of flexibly coping with equipment accidents in front and rear of a coil box, thereby improving standardization and simplicity of operation.

Claims (1)

A three-bender roll (11) installed to swing three bender rolls so that the lower roll (17) is placed on the rolling pass line (70) during bypass hot rolling; Cradle rolls (12a, 12b, 12c) mounted on the line (60) during the coiling operation and vertically movable to move to the rolling pass line (70) for acting as a table roller during bypass hot rolling; A heating device 22a or 22b heated to maintain a predetermined temperature is provided on the ceiling and a coil car 14 is installed on the bottom to move the hot-rolled coil 10, A buffering cracking furnace 19 in the form of a compartment made of the manufactured refractory structure 21; And a coil car (14) loaded on the hot rolling coil (10) in the winding device (13) and provided so as to be movable to the buffering crack path (19) through the passage door (20) And the process is connected in a straight line.