KR20140082496A

KR20140082496A - Scarfing apparatus without contact continuous casting slab surface

Info

Publication number: KR20140082496A
Application number: KR1020120152540A
Authority: KR
Inventors: 전중섭; 김환석; 신연식; 서재섭
Original assignee: 주식회사 포스코
Priority date: 2012-12-24
Filing date: 2012-12-24
Publication date: 2014-07-02

Abstract

The present invention relates to an apparatus for scarring a surface of a slab produced in a performance process, the apparatus comprising: a scarfing upper unit for scapping an upper surface of a slab; a scarfing unit for scarring a lower surface of the slab, And a unit gap maintaining stopper provided on both sides between the upper unit and the lower unit for maintaining a constant distance between the upper unit and the lower unit.

Description

[0001] SCARFING APPARATUS WITHOUT CONTACT CONTINUOUS CASTING SLAB SURFACE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scarfing apparatus, and more particularly, to a performance slab surface contactless scarring apparatus that prevents contact between a scarfing unit and a slab so as to prevent scratches on the surface of the slabs produced in a playing process.

In general, in order to secure the quality of automotive steel (AHSS) and high grade steel (API) among the slabs produced in the steel making process, it is necessary to use the slabs' pitting, blow holes, The machine scarfing operation and the hand scarfing operation are roughly divided into two processes. In particular, the machine scaping operation is performed by moving the scarfing device from the fixed state to the roller table device, .

The scarping unit controls the air pressure so as to keep the gap between the slab and the scarfing unit while the scarfing upper unit and the lower unit operate separately. During the scarfing operation, the floating operation of the scarfing unit includes a scarfing unit Although the purpose is to keep the slab spacing constant, the spacing between the slab and the scarfing unit can not be maintained constant due to various factors such as hunting of the air pressure supplied to control the scarfing unit. Further, the slab is continuously bended until the scarping operation is performed, so that scratches are scratched on the slabs whose scarfing has been completed due to contact between the slab and the scarfing unit in the scarfing operation in the lengthwise direction of 98% or more have.

However, in the conventional scarping device, it is impossible to install a suitable sensor or control device due to high temperature, dust, scale, cooling water splashing, etc., so that a method of maintaining a constant gap between the scarifying unit and the slab In order to remove scratched scratches that have not been developed, they are moved back to the hand scaping workspace to remove scratched scratches. As a result, additional processes are taking place and there is a problem in securing scarfing quality in high-volume steel production, which is pursued by steel mills such as automotive steel (AHSS) and high-grade steel (API).

The present invention relates to a musical instrument capable of preventing the occurrence of scratches on the surface of a slab caused by contact between a scarifying unit and a surface of a slab by keeping the gap between the scarf unit and the slab constant during scarping operation, Slab surface contactless scarring device.

The present invention relates to an apparatus for scarring a surface of a performance slab, comprising: a scarifying upper unit for scaping an upper surface of the slab; A scarifying lower unit installed at a lower portion of the scarifying upper unit and scapping a lower surface of the slab; And a unit gap maintaining stopper installed on both sides between the upper unit and the lower unit, the unit gap maintaining stopper maintaining a constant distance between the upper unit and the lower unit.

Further, the present invention further includes a scratch-preventive roller provided on the upper unit for preventing scratches on the surface of the slab by preventing contact between the upper unit and the slab during a scarifying operation, A contactless scarping device is disclosed.

In addition, the roller is positioned lower than the level of the upper unit so that the upper unit does not contact the slab during a scarping operation.

Wherein the floating air pressure is set so that the upper unit is gradually lowered due to its own weight and the floating air pressure is set so that the lower unit is gradually lowered in conjunction with the stopper when the upper unit is down. A contactless scarping device is disclosed.

Further, the present invention discloses a performance slab surface contactless scarfing device in which cooling water is supplied to the inside of the roller.

Further, the present invention is characterized in that a plurality of cooling rollers are provided facing the rollers, and further comprising a cooling water spray nozzle for spraying cooling water onto the rollers so that the melt scale is not fused to the surface of the rollers during scarping operation, Device.

Also, the cooling water spray nozzle ejects cooling water onto the surface of the roller only during a scarping operation without spraying cooling water onto the surface of the roller at the time of preheating the slab.

The performance slab surface contactless scarring apparatus according to the present invention has the following effects.

(1) According to the present invention, it is possible to prevent scratched scratches on the slab surface due to bending of the slab, air pressure hunting and other factors during the scarping operation, thereby preventing the secondary process from occurring , It is possible to secure scarfing quality for stable mass production of high-grade steel pursued by steel mills such as automotive steel sheet (AHSS) and API as well as to improve slab surface quality, and to reduce costs and solve surface quality defects .

(2) The present invention prevents scraping due to contact between the scarifying unit and the slab, thereby avoiding a secondary process and reducing costs, and preventing scratched scratches, regardless of whether the slab is bent or not, Alloy of quality strict material such as shell, dramatically reduces the out-of-order ratio due to defects, no stellite skid attached to the unit by scraping unit and slab contact, unit shoe block life span, reduced scratch flaw , Reduction of scarfing lead time, reduction of grinder wheel consumption, reduction of equipment trouble, reduction of power cost, and reduction of maintenance cost.

1 is a front view (a) and a side view (b) showing a playing slab surface contactless scarring apparatus according to a preferred embodiment of the present invention.
Fig. 2 is a perspective view showing a stopper for maintaining vertical spacing of the non-contact scarring apparatus of the performance slab surface according to the present invention.
3 is a schematic view showing a roller for preventing scratching and a cooling water spraying nozzle of a performance slab surface contactless scarring device according to the present invention.
4 to 7 are a front view (a) and a side view (b) showing an operating state of the playing slab surface contactless scarring apparatus according to a preferred embodiment of the present invention.
8 is a chart of operation of upper and lower units of a playing slab surface contactless scarring apparatus according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a front view (a) and a side view (b) showing a non-contact scarring apparatus for a performance slab surface according to a preferred embodiment of the present invention, Fig. 3 is a schematic view showing a roller for preventing scratches and a cooling water spraying nozzle of the performance slab surface contactless scarring apparatus according to the present invention. Fig.

1 to 3, the playing slab surface contactless scarring apparatus according to the present invention includes a scarfing upper unit 10, a scarfing lower unit 20, a gap holding stopper 30, A roller 40 and a cooling water injection nozzle 50. [

The scarfing upper unit 10 is a structure for scaping the upper surface of the slab 1 by being positioned at the upper portion of the slab 1 produced in the performance process and moved to the scarifying work space by the conveying roller 2.

The scarfing lower unit 20 is provided below the scarfing upper unit 10 and scallops the lower surface of the slab 1.

Since the configurations of the scarping upper unit 10 and the lower unit 20 can be understood by known techniques, a detailed description thereof will be omitted.

In the present invention, in setting the floating air pressure of the scarf unit, the upper unit 10 sets the floating air pressure so that the upper unit 10 is gradually lowered by its own weight, The floating air pressure is set so as to be gradually lowered in conjunction with the stopper 30 so that only one roller 40 is installed in the upper unit 10 so that the scraping operation can be carried out in the scraping operation, It is possible to prevent scratched scratches on the underside.

The gap holding stopper 30 is provided on both sides between the upper unit 10 and the lower unit 20 and keeps the upper and lower intervals between the upper unit 10 and the lower unit 20 constant. In the present embodiment, the stopper 30 is formed in a cylindrical shape, but the stopper 30 is not limited thereto, but may be a polygonal column such as a triangular prism or a quadrangular prism.

The scraped scratch prevention roller 40 prevents the upper unit 10 and the slab 1 from coming into contact with each other during the scarfing operation so that scratches are not formed on the surface of the slab 1. [ The roller 40 is installed at a lower portion of the upper unit 10 in parallel with the upper unit 10 and has a disk type roller shape. The roller 40 is positioned 10 mm lower than the level of the upper unit 10 so that the upper unit 10 does not come into contact with the slab 1 during the scarping operation. In addition, the roller 40 is always supplied with cooling water to the inside of the roller 40 and the bearing housing 41 so as to sufficiently withstand the heat generated during the scarifying operation.

A plurality of cooling water spray nozzles 50 are provided so as to face the roller 40 and the cooling water is sprayed onto the surface of the roller 40 so that the molten scale does not adhere to the surface of the roller 40 during the scarping operation. The cooling water injection nozzle 50 injects cooling water onto the surface of the roller 40 only during the scarping operation without spraying the cooling water onto the surface of the roller 40 at the time of preheating the slab 1. [ The cooling water injection nozzle 50 is controlled in operation by a cooling water using solenoid valve 51.

FIGS. 4 to 7 are a front view (a) and a side view (b) showing an operating state of a playing slab surface contactless scarring apparatus according to a preferred embodiment of the present invention, Fig. 8 is a chart of the operation type of the upper and lower units of the scarping device.

As shown in FIG. 4, when the scraping operation is started after the slab arrives at the scarping position, a closing operation is performed as shown in FIG. 5, and the scarifying upper unit is down (The rollers installed at a position 15 mm lower than the level of the upper unit are seated on the slab), the stoppers for holding the unit spaces are installed on both sides between the upper unit and the lower unit The lower unit tries to ascend but interlocks with the unit gap holding stopper provided on the upper and lower units, so that the lower unit can not be raised any more, so that the lower unit and the slab are kept in a non-contact state But the vertical operation without any description will be omitted). In the state where the interval between the upper and lower units and the slab is maintained at 10 mm each by the above operation, the standoff operation as the next operation is performed as shown in FIG. 6, so that the interval between the upper and lower units and the slab Preheat the slab to 30 mm each. When the scraping operation is started after the preheating of the slab is completed, a preheating failure occurs due to scattering in the slab head part at the time of preheating, so that the solenoid valve for cooling water is opened on the surface of the roller in the off state, To prevent fusing to the surface of the roller, and to prevent scratched flaws when the roller is driven by the fused scale. After the scatting operation is started and the set time (about 5 seconds), the floating operation is performed as shown in FIG. 7, the upper unit is lowered again and the roller is seated on the upper surface of the slab, The interval is maintained at 10 mm and the lower unit is raised, but is automatically maintained at 10 mm by the unit interval holding stopper. Since the upper and lower units are operated by interlocking the upper and lower bending slabs in the scraping operation by the above operation, the interval between the upper and lower units and the slabs can be kept constant, thereby preventing scratches on the slab surface can do.

Therefore, according to the present invention, there is provided a noncontact scarring apparatus for scraping the surface of a slab, which is caused by bending and air pressure hunting of the slab during scarping operation, (AHSS) and API as well as scaffolding quality to enable stable production of high-quality steel for steel mills, and to improve the quality of slab surface, Saving and surface quality defects can be solved. In addition, the scarfing due to the contact between the scarfing unit and the slab is prevented and the secondary process does not occur. Therefore, it is possible to reduce the cost and to prevent scratches, regardless of whether the slab is bent or not, (A1) defects, the need for a stellite skid to attach the unit to the scalloping unit and the slab contactlessly, and the lifetime of the unit shoe block, and the scarf due to the reduction of scratched flaws Reduction of lead time (Scarfing Lead Time), reduction of grinder wheel consumption, reduction of facility trouble, reduction of electric power cost, and maintenance cost.

While the present invention has been described in connection with certain exemplary embodiments, it will be understood by those skilled in the art that various changes may be made without departing from the scope of the present invention. Further, the scope of the present invention is determined by the matters set forth in the claims, and the brackets used in the claims are not used for optional limitation, but are used for specific components, .

10: Scaping upper unit
20: Scaping lower unit
30: Unit stopper
40: scraped anti-scratch roller
41: Bearing housing
50: Cooling water injection nozzle
51: Solenoid valve

Claims

An apparatus for scarring a surface of a slab produced in a performance process,
A scaping upper unit scaping an upper surface of the slab;
A scarifying lower unit installed at a lower portion of the scarifying upper unit and scapping a lower surface of the slab; And
And a unit gap maintaining stopper provided on both sides between the upper unit and the lower unit and maintaining a constant distance between the upper unit and the lower unit.

The scarfing device according to claim 1,
Further comprising a scratch-preventive roller installed in the upper unit to prevent scratches on the surface of the slab by preventing contact between the upper unit and the slab during a scarifying operation.

3. The method of claim 2,
Wherein the rollers are positioned lower than the level of the upper unit so that the upper unit is not in contact with the slab during a scarping operation.

3. The method of claim 2,
Wherein the floating air pressure is set so that the upper unit is gradually lowered by its own weight and the floating air pressure is set so that the lower air unit is gradually interlocked with the stopper when the upper unit is down. Caring device.

3. The method of claim 2,
Characterized in that the roller is supplied with cooling water therein.

The scarfing machine according to claim 2,
And a plurality of cooling water injection nozzles facing the rollers and spraying cooling water to the rollers so that the molten scale is not fused to the surfaces of the rollers during the scarping operation.

The method according to claim 6,
Wherein the cooling water spray nozzle injects cooling water onto the surface of the roller only during a scarping operation without spraying cooling water onto the surface of the roller at the time of preheating the slab.