KR101585690B1 - Method for removing residue from material in hot recoil line - Google Patents

Abstract

A method for removing material residues from hot rolling correction lines is provided.

The method of removing material residues in a hot-smelting line includes the steps of spraying hot air at at least one point toward a material being conveyed in a hot-smelting line to remove residues adhering to the material; And controlling the air flow rate and the temperature of the hot air by identifying the kind of the material before the hot air blowing step and the step of preventing the overheat by measuring the temperature of the hot air, Controlling the air volume and the temperature of the hot air by identifying the type of the material includes driving the blower to blow hot air of different air volume according to the type of the material on the basis of the discriminated result; And controlling the driving of the heating unit for heating the air flowing through the blower so that hot air of different temperatures is injected depending on the kind of the material based on the discriminated result.

According to the present invention as described above, it is possible to obtain an improved effect of improving the productivity by minimizing the residue remaining on the surface of the work.

Hot rolling correction line, low temperature winding material, hot air blowing

Description

[0001] METHOD FOR REMOVING RESINUE MATERIAL IN HOT RECOIL LINE [0002]

More particularly, the present invention relates to a method and apparatus for removing residues from a material such as a low-temperature spirally wound material, such as foreign matter or residual water remaining on the surface in a hot rolling process, And removing defects such as a roll mark on the roll surface of the hot-rolled steel line by removing the hot-rolled steel sheet.

The hot-rolled steel strip is rolled in the form of a strip through a hot rolling process, and the rolled strip wrapping material is supplied and cut to length according to the order specification of the final demanded steel, It is a process line for unwinding and rewinding the strip winding to perform inspection.

In the hot rolling process in which a strip winding material supplied to the hot-rolled steel line is manufactured, a steel slab supplied from the casting furnace passes through a roughing mill and is rolled into a strip through a finishing mill.

Most of the strips are usually in a state of high temperature equal to or higher than the boiling point of water. Therefore, when the coil is wound in the form of a coil, a period after the finishing mill, such as a scale included between the coils while passing through the runout table section (ROT section) Residual water such as foreign matter and cooling water is vaporized and removed.

However, in the case of the low-temperature winding-up material, the foreign matter and the residual water are not vaporized because they are wound at a low temperature of about 100 캜 or lower. As a result, the foreign matter and cooling water are transferred from the hot- There is a problem that surface defects may be generated in materials that are supplied to the hot-smoothing correction line and contact the roll.

Further, there is a problem in that the cycle of replacing rolls of the hot-rolled steel line is shortened and the productivity is lowered.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a hot-smoothing line removing method and apparatus for removing residues from a material such as a residual- Which is capable of preventing a defect such as a roll mark from being generated on the surface of a roll of a hot-rolled steel sheet.

According to an aspect of the present invention, there is provided a method of manufacturing a hot-rolled steel sheet, comprising the steps of: spraying hot air at at least one point toward a material conveyed in a hot- And controlling the air flow rate and the temperature of the hot air by identifying the kind of the material before the hot air blowing step and the step of preventing the overheat by measuring the temperature of the hot air, Controlling the air volume and the temperature of the hot air by identifying the type of the material includes driving the blower to blow hot air of different air volume according to the type of the material on the basis of the discriminated result; And controlling the driving of the heating unit for heating the air flowing through the blower so that hot air of different temperatures is injected depending on the kind of the material based on the discriminated result.

The injection point of the hot air preferably includes an inlet of a leveling process and an exit of a skin-pass milling process.

The step of measuring the temperature of the hot air to prevent overheating includes the steps of: measuring the temperature of the air flowing through the blower and heated by the heating unit; And controlling driving of the heating unit so that the heating unit does not overheat based on the measurement result.

The material is preferably a low-temperature rolled material obtained by a hot-rolling process.

Preferably, the residue is foreign or residual water remaining on the surface of the low-temperature spiral wound material during the hot rolling process.

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According to the present invention, it is possible to minimize surface defects in a material by minimizing residues such as foreign matter or residual water remaining on the surface of the material.

Furthermore, it is possible to extend the roll replacement cycle of hot rolling correction lines and improve the productivity.

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

1, a hot-smoothing line 10 according to the present invention includes a pay-off reel 11, a leveling device 13, a skin- pass milling device 15, and a workpiece remnant removing apparatus 100.

The payoff reel 11 is an uncoiling apparatus and an inner diameter portion of the strip winding member manufactured in the hot rolling process is inserted. When the driving motor of the payoff reel 11 is rotationally driven in the unwinding direction, the wound material 50, that is, the strip, is lifted in one direction, and the leveling device 13 composed of upper and lower rolls, And proceeds to the milling device 15.

The leveling device 13 and the skin pass milling device 15 are processing devices necessary to improve the flatness and shape of the material 50 to improve the quality as a product.

1 and 2, the material residue remover 100 includes an injection nozzle 110, a blower 120, a heating unit 130, an input unit 140, a storage unit (not shown) 150, a sensing unit 160, and a controller 170.

As shown in FIG. 1, the injection nozzle 110 injects hot air at at least one point toward the material 50 conveyed from the hot-smelting correction line 10 to remove residues adhered on the material 50 Is provided on the hot-smelting correction line (10).

The injection nozzle 110 is disposed vertically on the entrance side of the leveling device 13 and on the exit side of the skin pass milling device 15 so as to inject hot air toward the upper and lower surfaces of the material 50 . As an embodiment of the present invention, it is described that the injection nozzle 110 is disposed vertically on the entrance side of the leveling device 13 and on the exit side of the skin pass milling device 15. However, as another embodiment of the present invention, The nozzle 110 may be provided at the entrance of the leveling device 13 and at another device of the correction line after the skin pass milling device 15. [

As shown in FIG. 1, it is preferable that the injection nozzle 110 is provided with a valve member 111 so that the spray of the hot air is interrupted by the control unit 170, respectively.

Accordingly, by removing the residue so as to minimize the residue remaining on the surface of the blank, it is possible to increase the rate of correcting the blank of the blank, such as the low-temperature winding material, in the hot-

1, the blower 120 sucks air from the outside in conjunction with the hot-smelting correction line 10 so that air is supplied to the heating unit 130 through the blowing pipe 121. As an embodiment of the present invention, it is preferable that the air filter 123 is provided at the front end of the blower 120 so that foreign substances are filtered from the air to be sucked. The blower 120 is preferably provided with a turbo blower such that the air is uniformly jetted at a speed of about 30 m / sec through the injection nozzle 110 under the control of the controller 170.

The heating unit 130 is connected to the blower 120 through the blowing pipe 121 to blow hot air heated by the blower 120 to blow the hot air through the blowing nozzle 110, To the injection nozzle 110. The heating unit 130 is preferably selected under the condition capable of raising the air of 3 m 3 / min to 100 ° C., and accordingly, the heating unit 130 is heated to about 9 kW / Capacity.

2, the input unit 140 is connected to the reference of the low-temperature winding material among the materials 50 conveyed to the pay-off reel 11 and conveyed from the hot-wire correction line 10 The temperature of the hot air according to the type of the low temperature wind-up material, the temperature of the hot air, the temperature of the hot air according to the type of the low temperature wind-up material, And transmits the data to the control unit 170. The control unit 170 receives the data from the control unit 170,

The storage unit 150 stores and stores all data required by the control unit 170. If there is a request from the control unit 170, the storage unit 150 transmits the stored data to the control unit 170. [

As shown in FIG. 1, the sensing unit 160 is provided in the hot-smoothing line 10 to identify the type of the material 50 and measure the temperature of hot air. 1, the sensing unit 160 is provided inside the heating unit 130 to measure the temperature of the hot air in the heating unit 130, And it is preferable that it is provided on the side of the payoff reel 11 so as to identify the type.

The sensing unit 160 provided on the payoff reel 11 senses the temperature of the material 50 conveyed to the payoff reel 11 or recognizes the unique identification number displayed on the surface of the strip winding material, Of the low temperature spooler. For example, the low-temperature wind-up material is an AHSS (Advanced High Strength Steel) having a hot-rolled tensile strength of about 540 MPa or about 590 MPa. The coil temperature can be about 100 캜 or less (maximum 200 캜 or less).

Although not shown, the sensing unit 160 may be provided by means of a camera to sense the amount and position of foreign matter or residual water remaining in the workpiece 50 mounted on the pay-off reel 11.

2 and 3, the control unit 170 controls the driving of the blower 120 and the heating unit 130 based on the result detected by the sensing unit 160 in association with the sensing unit 160 Control. The control unit 170 controls the spraying direction of the spray nozzles 110 and the direction of spraying of the material 50 so that residues remaining on the surface of the material 50 are removed depending on the amount and position of the residue remaining in the material 50 or the type of the low- And controls opening and closing of the members 111, respectively.

This minimizes residue such as foreign matter or residual water remaining on the surface of the material 50 such as the low-temperature winding material, thereby preventing the occurrence of defects such as roll marks on the roll surface of the hot-wire correction line 10 It is possible to prevent the occurrence of surface defects in the material 50. [

A method of removing workpiece residues in the hot offset line 10 according to the present invention will now be described with reference to FIGS.

A method for removing workpiece residues in a hot offset line 10 according to the present invention includes the steps of spraying hot air at at least one point toward a workpiece 50 conveyed from a hot- Removing the adhered residue, controlling the air flow rate and temperature of the hot air by identifying the type of the material (50) before the hot air blowing step, and preventing the overheat by measuring the temperature of the hot air Or both.

Preferably, the injection point of the hot air includes an inlet side of the leveling process and an exit side of the skin pass milling process, and the material 50 is preferably a low temperature winding material subjected to a hot rolling process, It is preferable that the foreign matter or the residual water is remained on the surface of the low-temperature wind-up coil.

The method of removing the material residues of the hot-smelting line of the present invention will now be described in detail with reference to FIG.

First, a reference (a temperature reference or a unique identification number of the low-temperature winding-up material identified by the low-temperature winding material) of the material 50 to be transferred from the hot-rolled correction line 10 to the input unit 140, The temperature of the hot air, the wind speed, the temperature, and the operation of the heating unit 130 are stopped in order to prevent the heating unit 130 from overheating, depending on the kind of the low temperature windup material, And inputs all the data required by the controller 170 including the reference temperature of the hot air to be heated.

Next, when the strip winding material is mounted on the payoff reel 11 of the hot-rolled straightening line 10, the type of the material 50 is identified by the sensing unit 160 provided on the pay-off reel 11 S100).

The control unit 170 determines whether the material 50 is a low temperature winding material based on the identification result in the sensing unit 160 (S200).

If it is determined in step 200 that the material 50 is a low-temperature wind-up material, the controller 170 operates the blower 120 and activates the heating unit 130 to heat the air flowing through the blower 120 S300).

If it is determined in step 200 that the material 50 is not a low temperature winding material, this means that the residue on the surface of the material 50 is vaporized and hardly exists, so the step ends.

The hot air heated by the heating unit 130 is injected through the injection nozzle 110 provided at the inlet side of the leveling process and the scale or residual water remaining in the low temperature winder is introduced into the leveling process The foreign matter or residual water remaining in the low-temperature wind-up material is secondarily removed even after the skin-pass milling process is performed through the spray nozzle 110 provided in the exit of the skin pass milling process .

The control unit 170 identifies the detailed type of the low-temperature winding-up material through the sensing unit 160 after step 300 (S400), and determines whether the wind speed, the wind amount and the temperature of the hot wind are different depending on the type of the low- The valve member 111 and the heating unit 130 on the basis of the result of the discrimination through the controller 160 (S500).

The control unit 170 measures the temperature of air heated by the heating unit 130 through the blower 120 by the sensing unit 160 provided in the heating unit 130, (S700) whether the temperature of the air heated in the heating unit 130 has reached the reference temperature based on the result of the measurement in the heating unit 130 (160).

If it is determined in step 700 that the air temperature has reached the reference temperature, the controller 170 controls the heating unit 130 to stop the operation of the heating unit 130 (S800).

If it is determined in step 700 that the temperature of the air has not reached the reference temperature, this means that the risk that the heating unit 130 is overheated is not yet high, and therefore the step ends.

Therefore, according to the present invention, the roll replacement cycle of the hot-smelting correction line 10 can be extended, and the productivity including the corrected slip rate of the low-temperature winding material in the hot-smelting correction line 10 can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an apparatus for removing material residues in a hot-

2 is a control block diagram of an apparatus for removing material residues in a hot-

3 is a control flowchart of a method for removing workpiece residues in a hot-rolled steel line according to the present invention.

Description of the Related Art

100: Material residue remover 110: Spray nozzle

120: blower 130:

140: Input unit 150:

160: sensing unit 170:

Claims (6)

Removing hot air from at least one point toward the material being conveyed in the hot rolling correction line to remove residues adhering to the material; And A step of identifying the type of the material before the step of spraying the hot air to control the amount and temperature of the hot air and the step of preventing the overheat by measuring the temperature of the hot air, The step of controlling the air volume and the temperature of the hot air by identifying the type of the material, Driving the blower to blow hot air of different air volume according to the kind of the material on the basis of the discriminated result; And Controlling the driving of the heating unit for heating the air flowing through the blower so that hot air of different temperature is sprayed depending on the type of material based on the discriminated result; And removing the remaining material from the hot rolled line. The method according to claim 1, Wherein the injection point of the hot air includes an inlet of a leveling process and an outlet of a skin-pass milling process. delete The method according to claim 1, The step of measuring the temperature of the hot air to prevent overheating includes: Measuring the temperature of the air flowing through the blower and heated by the heating unit; And Controlling the driving of the heating unit so that the heating unit does not overheat based on the measurement result; And removing the remaining material from the hot rolled line. The method according to any one of claims 1, 2, and 4, Wherein the material is a low temperature rolling material subjected to a hot rolling process. The method according to any one of claims 1, 2, and 4, Wherein the residue is foreign or residual water remaining on the surface of the low-temperature rolling-up member during the hot rolling process.

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