KR101009009B1 - Device for protecting oxidation of roll in wire rod mill - Google Patents

Abstract

An object of the present invention is to form a clean atmosphere with excellent coating property on the surface of the carver of the ball roll to include a rust preventive paint and to prevent the rust preventive paint from peeling and desorption during the wire rolling operation. It is to provide a surface oxidation prevention device.

Therefore, the present invention is applied to the ball roll carver of the wire rod rolling mill to prevent the rust generation, the cooling means for cooling the preliminary Carrier successive to the Carrier in which the material rolling operation is carried out, replacement during the Carrier replacement operation Provided is an anti-roll surface oxidation apparatus of a wire mill including a heating means for oxidizing and removing the rust preventive insert on the surface of the preliminary Carrier.

Ball roll, Carrier, Auxiliary cooling nozzle, Heating burner

Description

Device for protecting oxidation of roll in wire rod mill

1 is a schematic view showing a typical wire rod manufacturing line,

2 is a perspective view showing a state in which the ball roll surface oxidation prevention apparatus according to the present invention is installed in a wire rod rolling mill;

3 is a perspective view of a part of the apparatus for preventing surface roll oxidation according to the present invention;

Figure 4 is a perspective view showing a state that the antirust paint is applied to the surface of the carver of the ball roll in accordance with the present invention,

Figure 5 is a schematic diagram showing a wire rod rolling mill according to the prior art.

Explanation of symbols on the main parts of the drawings

10: rolling mill 20: ball roll

21,22: Carrier 30: Turning Machine

31 brush 40 cooling nozzle

41: auxiliary cooling nozzle 42: supply pipe

43: water pipe 46: valve

50: heating burner

The present invention relates to a wire mill, and more particularly, to protect the surface of the carver of a rolling mill ball roll from rust and rust, and to improve the rolling dentability between the roll of the roll and the roll material of the roll during the pre-rolling operation of the wire roll after moving the carver. It relates to a surface roll oxidation prevention device that can be increased.

In general, as shown in FIG. 1, the wire is heated in each furnace by a billet heated in the heating furnace 100 through the coarse pressure study section 112, the medium pressure study section 114, and the finishing pressure study section 116. It is formed in the ball size of the, is cooled in the water chiller 120, then wound in a spiral coil 122, and subjected to a series of wire rolling process is conveyed to the subsequent process through the conveyor roller 124. Dozens of rolling mills are arranged in each rolling section, and each rolling mill is equipped with a work roll composed of calibers. Wire rods of sectional size are produced.

In other words, the wire rod is heated by heating the billet material having a cross section of 160 x 160 mm to 940 ~ 1200 ° C which can be wire rolled according to the steel type of the billet in the heating furnace, the rough rolling, intermediate rough rolling, intermediate finishing rolling, filament rolling After the continuous rolling of wire rod products of 5.5 ~ 42mm∮ diameter is produced, and then the wire products are produced through the process of cooling and winding, heat treatment, product inspection, basis weight, and warehouse.

The rough rolling process is to produce a rolled material of # 95 ~ 100mm diameter through the # 1 ~ 5 rolling mill (STD) of the billet extracted from the heating, the intermediate rough rolling process is a rolling mill # 5A ~ 11 as the rolling material ( STD) is passed through 8 rolling mills to produce a rolled material of diameter 29 ~ 42∮, the material of the ball roll constituted in the rolling mill is usually used spheroidized graphite iron.

In addition, as shown in FIG. 5, the ball roll 110 configured in the rolling mill 100 of the rough rolling process and the intermediate rough rolling process of the wire rod is formed with the same type of the carburage 111 in a continuous manner, and thus rolling work. Carrier 111 is formed on the side of the caliber 111, the caliber cooling cooling water injection nozzle 120 is positioned to spray the coolant.

As a result, several unused calibers are moved to the work pass line in turn in order to replace the calibers. Approximately 20 to 30 days, the Carrier replacement is carried out in a cycle of 1 to 7 days.

Here, in the conventional wire rough rolling operation, a large amount of rust is generated on adjacent unused surface of the carrier by contact with outside air and a large amount of cooling water. During the rolling operation of the rolling, slippage occurs between the rolled material and the surface of the rolled roll due to the oxidized rust of the newly replaced carver surface, which causes a fatal problem in the rough rolling of the wire which is not rolled. I'm making it.

Therefore, in order to prevent slippage caused by the insertion of the carrier and the rolled material during the initial rolling work after the carburet replacement work of the crude steel wire rolling, polishing to remove oxide rust formed on the surface of the carver to achieve a successful trial rolling operation ( Grinding) and a series of carver surface care operations to clean the carver surface are essential.

However, in the prior art, in order to remove a large amount of oxidized rust formed in the carver during the work of replacing the carbure of the roll, in the state of rotating the ball roll at the rough rolling site, a large amount of dust of oxidized rust is removed in the process of removing the rust of the carver with a grinder. The grinder work in the form of unstable work in the narrow working environment of the rough rolling mill and the unstable shape of the rolling mill, and the risk of stenosis disaster of the high-speed rotating rolls is high. As the average time was 15 minutes or more, the Cariba replacement work was delayed, adversely affecting the production of the wire rod product.

Accordingly, in order to solve the above problems, Utility Model Registration No. 93071, previously filed, has a ball roll anti-rust strip plate attached to the ball roll, and the inside of the ball roll is sealed to the outside air and cooling water. Disclosed is a technique for preventing oxidation of the surface of a roll by contact blocking.

However, in the prior art, when the ball roll anti-rust strip is attached to the ball roll, the ball roll anti-rust strip is composed of a thin steel plate, so that there is a fine gap in the contact portion between the surface of the ball roll and the ball roll anti-rust strip, The silicone coating to seal the mold should be made in advance. Also, the roll-protection strip plate attached to the mold roll undergoes thermal expansion while receiving a rolled material radiation temperature of about 1000 ° C. or more during the wire-rolling operation. Fine gaps are generated between the prevention bands, so that cases of penetration of the cool roll coolant frequently occur at the rough rolling site. Oxidation rust occurs frequently on the surface of the roll. Therefore, grinding work to remove the rust formed on the roll must be additionally performed. There is a problem.

In addition, as a conventional process for preventing rust oxidation, a method of applying an anti-rust paint or metal coating material (Metal Coating M / T) to the surface of the carver of the ball roll was also implemented. In the rolling operation, the cleaning (washing using thinner or solvent) to remove the rust-preventive paint or metal coating material applied to the surface of the ball roll is performed, and the complete removal of the rust-preventive paint or metal coating material applied to the ball roll is performed. Not only is it not easy, but the time required for removing the rust preventive paint or metal coating material is greatly delayed, and above all, the surface of the carver coated with the rust preventive paint or metal coating material, which is the surface portion of the new carver immediately adjacent to the carver to be rolled, The rolling material is subjected to radiant heat and heat conduction of about 1000 ° C. or more to prevent the rust-preventive paint or metal coating material from By radiant heat and thermal conductivity of the material as soon as a high temperature as well as there is a problem that rust thick oxide occurs in a part of the car river surface as a problem that is gradually peeled off from the removable car river surface occurs the deformation made.

As another conventional anti-roll oxidation method, a sticky tape having excellent elasticity and adhesiveness is adhered to the carrier surface of the ball roll to block the carrier surface from contact with outside air and cooling water to oxidize the carrier surface. Although it prevents rust, this is because the round-shaped Carver shape has a very large difference in diameter between the inner diameter and the outer diameter, so that a gap in which wrinkles overlap on both ends is generated due to the elastic limit of the adhesive tape. When the adhesive tape is peeled off from the surface of the carver during operation, rust oxide is formed on the carvers, and some adhesive tapes are not easily separated when the adhesive tape attached to the surface of the carver is removed during the replacement of the car bar. Problem, a portion of the adhesive material applied from the tape attached to the surface of the carver remains on the surface of the carver A number of problems, such as to be fine-cleaning the surface of the river was caused.

Accordingly, the present invention has been made to solve the above problems, to form a clean atmosphere with excellent coating properties on the surface of the carrier of the ball roll to include the rust-preventive paint and also to remove the anti-rust paint during the wire rolling operation It is an object of the present invention to provide an apparatus for preventing oxidation of the surface of a roll of a wire rod that can be prevented from becoming.

In addition, in order to remove the antirust paint applied to the carver in a very short time during the replacement of the carver, and to provide an anti-roll surface oxidation device of the wire rolling mill to keep the surface of the carver clean. There is this.

In addition, it is another object to provide an anti-oxidation device for the surface roll of the wire rolling mill which can improve the workability of the rolling mill during pre-rolling by preheating the carrier surface of the roll during the wire rolling pre-rolling operation after the replacement of the carver. have.

In order to achieve the object as described above, the present invention is applied to the ball roll carver of the wire rod rolling mill to prevent rust generation, and to cool the preliminary carver that is continuous to the carver in which the material rolling operation is carried out. Cooling means, and heating means for oxidatively removing the anti-rust shield of the surface of the preliminary Carrier to be replaced during the Carrier replacement operation at high temperatures.

Here, the coating agent may be used, such as rust preventive paint or metal coating agent.

Accordingly, the antirust paint is applied to the surface of the carver of the roll of manufacturing the wire rod product, and the preliminary carver surface to be used for spraying the cooling water is protected, and the antirust paint on the surface of the carver is heated by a heating burner during the movement of the carver. It can be burned and burned so that the surface of the carver can be cleaned and the wire can be rolled.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a typical wire rod manufacturing line, according to the above drawings, the billet heated in the heating furnace 100 for each steel type is rough pressure study section 112, intermediate pressure study section 114, filament rolling A series of wire rolling processes are formed in the sphere size of the wire rod through the section 116, cooled in the water cooling unit 120, then wound into the spiral coil 122, and transferred to the subsequent process through the conveyor roller 124. Go through In each rolling section, dozens of rolling mills are arranged, and each rolling mill 10 is provided with a ball roll 20 composed of a caliber (caliber; 21). The wire rod is stretched in the longitudinal direction to produce a wire rod having a desired cross-sectional size.

In addition, Figure 2 is a perspective view showing a state in which the surface roll prevention device 20 in accordance with the present invention is installed on the wire rolling mill 10, Figure 3 is a surface oxidation prevention device of the ball roll 20 in accordance with the present invention Some configuration perspective view.                     

According to the above-described drawings, the apparatus is a rust-preventive paint applied to the ball roll 20, the caliber 22 of the rolling mill 10, and a preliminary caliber 21 continuous to the caliber 21 in which the material rolling work is performed. Cooling means for cooling), and heating means for oxidizing and removing the antirust rust shield on the surface of the preliminary carrier 21 to be replaced during the replacement operation of the carrier 21 at high temperature.

According to this embodiment, the rust preventive paint may be applied in a state in which the turning process of the ball roll 20 is completed, as shown in FIG. 4, the ball roll 20 to the ball mill 20 and the turning machine 30. In this mounting step, the surface of the caliber 22 of the milled ball roll 20 is cleaned, and then the ball roll 20 is rotated by rotating the ball roll 20 by the turning machine 30. The antirust paint is applied to the surface of the carrier 22 by a separate brush 31.

Then, when the ball roll 20 is transferred to the ball roll 20 waiting place, and the rust preventive paint is sufficiently dried on the surface of the carver 21, the bearing is formed on the ball roll 20 in the ball roll 20 maintenance step. After the mounted choke is assembled, the pre-rolling roll 20 is replaced by the standby rolling roll replacement work of the wire-rolling through the standby state of the pre-rolling roll 20 and mounted on the wire rolling mill 10.

The cooling means includes a cooling nozzle 40 for spraying cooling water to the surface of the carburer 21 used for rolling, and a spare unit connected to the cooling nozzle 40 and located next to the carver 21 used for rolling. An auxiliary cooling nozzle 41 for injecting cooling water to the surface of the carrier 22 is included.

Therefore, the cooling nozzle 40 cools the surface of the caliber 21 in which the wire rod rolling is performed, and the auxiliary cooling nozzle 41 additionally provides a bar of the caliber 21 for rolling. Neighboring unused anticorrosive paint has been applied to the carber 22 is cooled.

On the other hand, the heating means is installed on one side of the rolling mill 10 and extends toward the carver 22 includes a heating burner 50 for injecting a flame on the surface of the carver (22).

Accordingly, the rust paint applied to the surface of the carver 22 by the heating burner 50 is heat-oxidized at the stage immediately before the carver replacement work is completed and the hourly rolling work is completed. During the rolling operation after the replacement of the carver by heating the surface of the carver 22 with the heating burner 50 as well as removing the antirust paint applied to the surface of the carver 22 by Carrier 22 surface is preheated to 70 ~ 120 ℃ to improve the dentability of the rolled material 70 and the rolled material between the surface of the carver.

In addition, in the wire end rolling operation of the rolled material after completion of the rolling of the wire end of the rolled material, the wire rod slip between the rolled material wire end and the surface of the carver is not performed, and the normal wire rolling is performed.

When describing the configuration of the present apparatus in more detail, the ball roll 20 for manufacturing a wire rod product is to remove the wear on the surface of the carver by turning the carver through the turning machine 30 according to the wear of the surface of the carver. When turning is completed, the turning machine is driven in a state where the ball roll is installed in the ball roll turning machine as it is, and the ball mill is rotated by 100 to 160 rpm and the carburized surface of the rolled ball roll is cleaned. By doing so, Carrier surface cleanability can be performed easily and effectively.

Carrier by applying the surface of the carrier 22 to the anti-corrosive paint while rotating the ball roll 20 to 50 ~ 120rpm by the turning machine 30 in the state in which the carbure surface cleaning process of the ball roll is completed. (22) In addition to excellent surface anticorrosive paint application, anticorrosive paint application on the surface of the carver is effectively performed.

The anticorrosive paint is then dried for a minimum drying time of at least 8 hours by transfer to a ball roll waiting area. The dried ball rolls are assembled to the roll chocks with bearings and replaced by wire rod rolling through the preliminary ball roll standby.

The surface of the neighboring unused carver 22 of the rolling carver 21, which is rolled through the carver replacement work of the rough rod of the wire rod, is prevented from contacting and blocking the outside air and the coolant by the application of the above-described antirust paint. It is made to prevent oxidation of the surface of the carver 22.

On the other hand, looking at the installation structure of the auxiliary cooling nozzle 41, as shown in FIG. 3, the water pipe 43 is slidably installed at the tip of the supply pipe 42 in which the cooling nozzle 40 is installed, and this water pipe 43 The auxiliary cooling nozzle 41 is installed in communication with each other, and the flange 44 and the end cover 45 are provided at the tip of the supply pipe 42 and the tip of the water pipe 43 to prevent the water pipe 43 from being separated. It is installed, the valve 26 for opening and closing the nozzle is provided on one side of the auxiliary cooling nozzle (41).

Here, the water pipe 43 is always drawn out from the supply pipe 42 by the water pressure of the cooling water so that the space between the cooling nozzle 40 and the auxiliary cooling nozzle 41 is kept to the maximum spaced apart state.                     

In addition, the auxiliary cooling nozzle 41 is in contact with the rolling mill 10 and the wall of the roll choke when using the final carriber among the plurality of carvers due to the characteristics of the ball roll 20, and this causes the interference of the auxiliary cooling nozzle 41. As the water pipe 43 enters and exits the cooling water supply pipe 42, the cooling nozzle 40 can sufficiently move to the final carver. In addition, when the final carver is used, the valve 46 installed in the auxiliary cooling nozzle 41 is operated to block the coolant.

Hereinafter will be described the operation of the present invention.

In the turning machine 30 in which the turning process of the carrier for manufacturing the wire rod product is completed, the ball roll is rotated at low speed to clean the surface of the carrier, and then rust-proofed at the surface of the carrier 22 rotating at low speed. The application of the paint is carried out, and the rust-preventive paint applied to the surface of the carver is transferred to the ball roll atmosphere and dried.

After that, the roll chocks with the bearings mounted on the ball rolls 20 are assembled and replaced with the ball rolls of the worn wire rough rolling which has already been wire rolled, and the wire rolling work is performed using the replaced new wire rough rolling ball rolls. In the construction, heating and oxidizing the anti-corrosive paint applied to the Carrier 22 by heating with the heating burner 50 on the surface of the Carrier 22 which is co-rotating during the time of the rolling operation according to the replacement of the Carver. The operation | work which cleans the surface of the carver 22 by the gas injection force of 50 is made.

Carrier 22 surface is preheated to 70 ~ 120 ℃ during the process of removing the rust preventive paint applied to the surface of the Carrier 22 with the heating burner 50, rolling during the hour rolling work after the Carrier replacement work The dentability between the raw material 70 and the surface of the carver is improved, and a normal wire rolling operation is performed in which slip is prevented during rolling of the wire end of the wire rolling.                     

Cooling water is injected through the second cooling nozzle 40 to another new carbber 22 adjacent to the carver 21 in which the rolling work is performed in the course of the normal wire rough rolling work. The cooling action is performed on the surface of the rust preventive paint applied to the surface of the new carver 22 due to the radiant heat and heat conduction emitted from the rolled material 70 at about 1000 ° C. Is prevented.

In addition, the inlet guide and the outlet which are arranged before and after the carrier 22 as well as moving the carrier 22 to the work path line during the replacement of the car bar which moves the unused new carvers 22 to the work path line. The guide is moved and fixed, and then heated in the heating burner 50 on the surface of the carrier 22 which rotates by rotating the ball roll in the step of replacing the car bar.

By heating the surface of the caliber 22 which rotates as mentioned above with the heating burner 50 which blows a flame at 1500 degreeC or more, the antirust paint apply | coated to the surface of the caliber 22 is carried out of the said heating burner 50. The oxidation reaction is performed by heating to completely remove from the surface of the carver 22, and the oxidized dust-like foreign matter of the rust preventive paint applied to the surface of the carver 22 by the gas blowing force of the heating burner 50 is removed. The surface of 22 is made clean.

In the process of removing the rust preventive paint applied to the surface of the carver 22 with the heating burner 50, the surface of the carver 22 is heated by the heating burner 50, thereby making the carver 22 ) Surface is 70 ~ 120 ℃ and it is preheated.                     

Thereafter, the upper and lower roll-gaps of the carriers are set to perform pre-rolling of the wire rolling according to the completion of the replacement of the carvers, and thus, the cleanliness of the carrier surface and the preheating of the carrier surface are performed. The process is carried out, and the rolling dentability between the surface of the carver and the rolled material according to the rolling is excellent, and the successful rolling operation is performed while preventing slip during rolling.

According to the apparatus for preventing roll surface oxidation of the wire rolling mill 10 according to the present invention as described above, the carver is cleaned by rotating the carver in the turning machine immediately after the completion of the turning process of the carver. Excellent surface clean workability, and then by turning the carver in the turning machine to apply the antirust paint on the surface of the carver, excellent workability of antirust paint on the surface of the carver and anticorrosive paint on the surface of the carver This is excellent, and rust oxide does not generate | occur | produce on a surface of a carver by apply | coating antirust paint on the surface of a carver immediately after turning.

By removing the rust preventive paint applied to the surface of the Carrier just in a very short time with a heating burner, and preheating the Carrier surface. After the completion of the work, it has excellent rolling dentability and the removal of the rust preventive paint applied to the surface of the carver in a very short time. Carrier replacement time is greatly shortened. Is increased.

Claims (4)

A coating agent applied to the ball roll carbur of the wire rolling mill to prevent rust generation; Cooling means for cooling the preliminary Carrier continuous to the Carrier in which the material rolling operation is carried out, Heating means for oxidatively removing the coating material on the surface of the preliminary carrier to be replaced during the carrier replacement Ball roll surface oxidation prevention device of the wire rod mill comprising a. The wire rolling mill according to claim 1, wherein the coating agent is applied by a brush in a state of rotating the ball roll and washing the carburized surface of the ball roll that is turned in a turning machine for turning the ball roll. Ball roll surface oxidation prevention device. 2. The cooling means of claim 1, wherein the cooling means injects cooling water to a surface of a carrier used for rolling, and to a surface of a preliminary carrier located next to the carrier used for rolling connected to the cooling nozzle. Apparatus for preventing surface roll surface oxidation of a wire rod mill, characterized in that it comprises an auxiliary cooling nozzle. 2. The apparatus of claim 1, wherein the heating means comprises a heating burner installed at one side of the rolling mill and extending toward the carrier to inject a flame to the surface of the carrier.

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