KR100782715B1 - Flying Remove Apparatus of Strip In A Process Hot Rolling - Google Patents

Abstract

The present invention compensates the flying phenomenon caused by the air resistance applied to the tip of the strip when the strip of the rolled sheet passes through the run-out table in the finishing process of various hot rolling processes by the water pressure sprayed from the high pressure spray nozzle. The present invention relates to a frying removal device for strips in a hot rolling process, which improves productivity and quality by preventing creases during winding and the occurrence of damaging materials, thereby improving productivity and quality. A pair of spray heads for spraying coolant to the frying portion of the strip which is installed on both sides of the strip where the rolled thin plate is entered into the run-out table, and is provided in each spray head to the traveling direction side of the strip An injection nozzle for injecting cooling water at an angle coinciding with any one point of a center line, and the injection head A solenoid valve installed at a connection portion of a coolant line connected to supply a coolant to a curved pipe formed at one side of the control panel and controlling the supply of the coolant, and rolling information such as the thickness and width of the strip connected to the solenoid valve is input to the strip. It is composed of a central computer and the like that determine the injection timing based on the load and the time when the tip of the strip reaches the set position of the runout table.

Hot Rolled, Strip, Flying, Spray Head

Description

Flying Remove Apparatus of Strip In A Process Hot Rolling}

1 and 2 are a side view showing the whole process of the general hot rolling process and a perspective view of the finish rolling process,

Figure 3 is a side configuration view showing an example in which the frying phenomenon occurs in the leading end of the strip in the conventional finish rolling process,

Figure 4 is a side configuration view showing the installation state of the frying removal device of the front end of the strip according to the present invention,

5 is a perspective view showing in detail the frying removal device of the front end of the strip of FIG.

6a and 6b is a plan view and a side view showing the installation state of the nozzle provided in the frying removal device of the strip end portion according to the present invention;

7 is a flowchart in accordance with the present invention.

Explanation of symbols on the main parts of the drawings

S: Strip F: Tip

2: finish rolling mill 4: run out table

7: winder 8: hot coil                 

10: spray head 11: spray nozzle

14: cooling water line 20: support beam

30: solenoid valve 40: central computer

The present invention provides a frying removal device for strips in a hot rolling process, and more specifically, frying due to air resistance applied to the tip of a strip when a strip of thin rolled sheet passes through a run-out table during finishing of various hot rolling processes. (Flying) is offset by the water pressure sprayed from the high pressure spray nozzle to improve the runability of the strip, preventing the occurrence of creases and damages caused by winding, thus improving the productivity and quality. And a frying removal device at the tip of the strip on the table.

In general, the hot rolling process for producing hot rolled steel sheet is first rough rolled slab heated at a constant temperature in a heating furnace, which is a preceding process, and then rolled to a bar (1) shape as shown in FIG. The final rolling operation is performed in the form of a strip S of the thin plate via the rolling mill 2, and the strip S which has undergone the final rolling process is a run out table consisting of a plurality of rollers 3 (4). While passing through), the cooling temperature is sprayed from the upper and lower portions of the strip (S) while securing the winding temperature to maintain the material properties, and then wound in a roll form in the winder (7) so-called hot coil (Hot Coil) ( 8) to produce.

On the other hand, the strip (S) exiting the finish rolling mill 2 at high speed is rolled from about 1.0 mm to about 2.2 mm thickness, especially the run-out table (4) as the thickness of the strip is thinner than 2.0 mm 2), the runability at the time of passing through) is unstable, and as shown in FIG. 2, the coolant is not poured in sequence from the front bank 5-1 composed of a plurality of lamina flow headers 5 close to the finishing mill 2 side. In the rear bank (5-3), which is a point where the strip (S) is capable of running to some extent, a cooling method is used to inject the coolant to the front end (F) of the strip (S), or the coolant is first blocked at the front end. Therefore, the method of not pouring coolant is mainly used.

The reason for this is that the thinner the strip S, the more it is impeded by the coolant injected vertically to the advancing strip S, which impedes the running of the strip, causing the strip to be struck between the rollers 3 on the runout table 4. This is because malfunctions (hereinafter referred to as damage materials) due to impossibility of winding occur while the strips S are accumulated at predetermined positions of the run-out table 4.

The rear cooling method performed by the above factors, that is, a method in which the cooling water is poured into the front end portion F of the strip in the rear bank 5-3, which is the point at which travelability is ensured when the strip is thin, or the cooling water at the front end portion of the strip. The following problems arise when adopting a method that does not pour water from the beginning.

The method of not pouring the cooling water to the strip front end portion F from the beginning is a cause of poor quality due to poor material properties due to the difference in cooling temperature in the longitudinal direction in the same strip (S).                         

In addition, in the rear cooling method of cooling at the time when the runability of the strip S is secured, as shown in FIG. 3, the air resistance AR in which the strip S advancing in the direction ⓐ on the run-out table is formed in the opposite direction. Due to this, a so-called frying phenomenon occurs in which the leading strip F is rolled upward, and the strip is caused by the coolant injected from the rear bank 5-3 while the strip is driven in the frying state. Since it is cooled and wound in the winder 7 while maintaining the frying phenomenon, when the frying phenomenon is severe, the occurrence of the loss material and the surface quality of the tip part F become poor while failing to pass through the pinch roll 6. Of course, there was also a problem that caused the error rate problem in the post-process.

The present invention has been made to solve the above-mentioned conventional problems, the frying phenomenon generated at the tip of the strip when the strip rolled in the finish rolling mill passes through the run-out table by the water pressure sprayed from the high-pressure spray nozzle It is an object of the present invention to provide a frying removal device for strips in a hot rolling process that prevents entanglement and malfunction when winding the strips by offsetting and improving the runability of the strips.

In order to achieve the above object, the present invention provides a pair of spraying cooling water to a frying portion of a strip which is installed on both sides of a portion where a strip of thin plate rolled in a finishing mill of a hot rolling process enters a runout table. An injection nozzle provided in each of the injection heads, the injection nozzles for injecting the cooling water at a corresponding angle toward a point of the center line in the traveling direction of the strip, and connected to supply the cooling water to the curved pipe formed on one side of the injection head. The solenoid valve installed at the connection part of the cooling water line and controlling the supply of cooling water, and the rolling information such as the thickness and width of the strip are connected to the solenoid valve, and the leading end of the strip is set at the load position of the strip and the runout table. It is composed of a central computer and the like to determine the timing of injection based on the time when And a gong.

Hereinafter, the frying removal apparatus of the strip in the hot rolling process of the present invention will be described in detail with reference to the accompanying drawings.

4 and 5 are perspective views showing in detail a state of installation and a frying removal device for the frying removal device of the front end of the strip according to the present invention, Figures 6a and 6b is a nozzle of the frying removal device As a plan view and a side view showing the installation state, the frying removing device of the present invention is installed on both sides of the portion where the strip S of the thin rolled in the finish rolling mill 2 of the hot rolling process enters the runout table. It consists of a pair of injection head 10 which injects a cooling water to the frying part of the strip which is advanced.

Each of the spray heads 10 is mounted to a support beam 20 positioned opposite to both sides of the strip passing on the run out table, and each of the spray heads 10 is directed to any point of the center line in the traveling direction of the strip. An injection nozzle 11 for injecting cooling water at a matching angle is provided.

At this time, the injection direction of both injection nozzles 11, as shown in Figs. 6a and 6b, downward with respect to the deflection angle β and the strip deviating from the width direction of the strip (S) based on the point where the coolant is reached. It is preferable for the running property of the strip to be installed so as to face in a direction that can satisfy the inclined horizontal angle α.

The injection nozzle 11 provided in the injection head 10 has a structure that can be assembled to the socket 12 formed integrally with the injection head, and a cooling water line 14 for supplying cooling water to one side of the injection head 10. Curved pipe 13 is formed to be connected to the) is provided with a solenoid valve 30 for controlling the supply of cooling water at the connection portion of the curved pipe (13).

The solenoid valve 30 is a central computer that transmits an opening / closing signal by inputting rolling information such as the thickness and width of the strip and determining the injection timing based on the time when the tip of the strip reaches the load of the strip and the set position of the run-out table. It is connected to 40.

The operation of the present invention having the above configuration will be described in detail with reference to the flowchart of FIG. 7.

First, as shown in FIG. 1, the slab heated at a predetermined temperature in a heating furnace, which is a preceding process, is rolled into a bar shape through a temper rolling mill (not shown), and introduced into the finishing mill 2 to be finished. When this is started, first, the thickness information and the width information of the strip S, which is finally produced by the central computer 40 into which the rolling information is input, are received. The thickness of the strip to be rolled is 2.0 mm or more, and the width of the strip is obtained. If it is larger than 1200 mm, the solenoid valve 30 is waited in a closed state to determine that the running performance is relatively stable due to the weight of the strip, so that the cooling water is not supplied. When the thickness of S) becomes 2.0 mm or less and the width of the strip is smaller than 1200 mm, the signal is received by the central computer 40 and the present invention enters the jet preparation.

At this time, the timing of opening the solenoid valve 30 by the central computer 40 to determine the timing of injection of the cooling water from the injection nozzle 11 of the injection head 10 is avoided at the F4 stand of the finish rolling mill 12. When the strip S, which is a rolled material, is bitten and rolled, the front end portion F of the strip, which is the rolled material, is provided in the spray head 10 of the present invention by a timer (not shown) of the calculator under the load signal of the F4 stand. When the point of time passing through the nozzle 11 is predicted and the value is added (load signal + passing time) to reach a predetermined position, the injection timing is determined.

When the injection timing is determined as described above, the solenoid valve 40 is opened by the signal of the central computer 40, and the high pressure water flows into each of the injection heads 10 installed on both sides of the strip. The high pressure water is sprayed through the fixed spray nozzle 11 while maintaining a constant horizontal angle α and a declination β toward the strip front end portion F advancing toward the strip F and forming in the opposite direction in which the strip S proceeds. By canceling the air resistance AR, the flying phenomenon to be formed by the air resistance is eliminated.

Subsequently, when a time (about 5 seconds) at which the front end portion F of the strip has a stable running with cooling action has elapsed, the solenoid valve 40, which has been opened, receives the time elapsed signal and closes again. It will be ready for the next frying removal.

According to the frying removal apparatus of the strip in the hot rolling process of the present invention, the frying phenomenon generated at the tip of the strip while the strip rolled in the finishing mill passes through the run-out table is set at a high pressure injection nozzle. By offsetting by the water pressure sprayed toward the strip to improve the runability of the strip to prevent the occurrence of tangling and damage during the winding, thereby improving the productivity and quality.

Claims (3)

A pair of spray heads 10 for spraying cooling water to the frying portion of the strip, which is installed on both sides of the portion where the strip S rolled in the finishing mill 2 of the hot rolling process enters the run-out table. And a spray nozzle 11 which is provided in each spray head 10 and sprays the coolant at an angle coinciding with any point of the center line on the traveling direction side of the strip S, and one side of the spray head 10. A solenoid valve 30 which is installed at a connection portion of the coolant line 14 connected to supply the coolant to the curved pipe 13 formed therein, and controls the supply of the coolant, and is connected to the solenoid valve 30 to have a thickness of the strip. And a central computer 40 which transmits an opening / closing signal by inputting rolling information such as width and width, and determining the injection timing based on the time when the load of the strip and the tip of the strip reach the set position of the run-out table. Frying removal device of strip in hot rolling process. The method of claim 1, wherein each of the spray head 10 is mounted on the support beam 20, which is located opposite to both sides of the strip (S) passed on the run-out table in the hot rolling process Ing Eliminator. The jetting direction of the jetting nozzle 11 is a deflection angle β deviating from the width direction of the strip S and a horizontal angle α inclined downward with respect to the strip, based on the point where the coolant is reached. Frying removal device of the strip in the hot rolling process, characterized in that it is installed facing the direction that can be satisfied.

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