JPH09253709A - Device for rolling hot coil with black scale - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the sticking of scale pieces to tensionmeter rolls in high- draft rolling of a hot rolled steel strip where the scale is mechanically descaled. SOLUTION: The hot rolled steel strip 2 with scale stuck is cold-rolled at a draft of 30-50%, brush rolls 5 and wringer rolls 6 are arranged on the downstream side of a rolling mill 4 with which the scale is removed or peeled from the surface of the hot rolled steel strip 2 and the tension-meter rolls 7 are arranged on the further downstream side of the brush rolls 5 or the wringer rolls 6. In this way, the steel strip after removed with scale is brought into contact with the tension-meter rolls 7, so the peripheral surface of the roll is maintained in a good surface state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling apparatus in which peeling scale is prevented from adhering to rolls in a high-pressure rolling mill that mechanically removes scale on the surface of a hot-rolled steel strip.

[0002]

2. Description of the Related Art A hot-rolled steel strip is covered with a scale mainly composed of an oxide. This hot rolled steel strip
If it is sent to a lower step such as cold rolling as it is, it causes defects such as surface flaws and cracks due to the hot rolling scale.
Therefore, the hot-rolled steel strip is usually removed by pickling, and the hot-rolled steel strip is transported to a lower step. This method has problems in pickling equipment, waste acid treatment, adjustment of descaling ability, and the like, and there is also a possibility that the properties of the steel material may be deteriorated due to intrusion of hydrogen generated during pickling. In order to solve various problems caused by the pickling, various methods for removing the scale of the hot-rolled steel strip sent to the pickling step have been studied. For example, cold rolling of a hot-rolled steel strip to which scale is attached at a high pressure ratio (hereinafter referred to as black scale rolling) is disclosed in Japanese Patent Publication No. 54-133460.
JP, JP-A-57-41821, JP-A-57-41821
No. 10917, and the like. Cold rolling at a high pressure reduction causes cracks in the scale and reduces the adhesion to the steel strip, so shot blasting, high-pressure water jetting, brushing, abrasive grain grinding, etc. can easily be performed on the steel strip after cold rolling. Is separated into As a result, the scale adhered to the hot-rolled steel strip carried into the pickling tank is reduced, and the pickling load is reduced.

[0003]

Discarded scale fragments remain on the surface of the hot rolled steel strip rolled under high pressure. The scale piece is removed from the steel strip surface by the brush roll arranged on the downstream side of the rolling mill, but it is transferred to the surface of various rolls arranged between the brush rolls, which causes a surface flaw. easy. Among them, the tension meter roll that measures the tension of the steel strip, which is the material to be rolled, is located on the exit side of the rolling mill, where there are many scale pieces that remain on the surface of the steel strip. Exposed to a harsh atmosphere. The present invention has been devised to solve such a problem, and by arranging a tension meter roll on the downstream side of a brush roll or a ringer roll, it is possible to suppress the adhesion of scale pieces separated from the steel strip surface. However, the purpose is to maintain the tension meter roll in a good surface condition for a long period of time.

[0004]

In order to achieve the object, the rolling apparatus for black skin hot coil of the present invention cold-rolls a hot-rolled steel strip with a scale attached at a rolling reduction of 30 to 50%. The brush roll and the ringer roll are arranged on the downstream side of the rolling mill that removes or peels the scale from the surface of the hot-rolled steel strip, and the tension meter roll is arranged on the further downstream side of the brush roll or the ringer roll. To do.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a rolling device for a black skin hot coil according to the present invention comprises a hot rolled steel strip 2 with a scale delivered from a payoff reel 1 and a bridle roll 3 as shown in FIG.
Then, it is sent to the rolling mill 4. The hot-rolled steel strip 2 is subjected to high-pressure rolling with a rolling reduction of 30 to 50% by a rolling mill 4. Most of the scale is mechanically removed from the hot-rolled steel strip 1 by high-pressure rolling, and the remaining scale also weakens the adhesive force to the ground iron. When the surface of the steel strip is rubbed with the brush roll 5, the scale with the weakened adhesive force is peeled off from the steel strip.
Next, the steel strip 5 from which the scale has been removed has its water removed from the steel strip surface by a ringer roll 6, and is then sent to the next pickling step, where it is finished to a clean surface without scale.

In the conventional rolling mill, the steel strip 2 which is the material to be rolled is used.
In order to measure the tension of the rolling mill 4, a tension meter roll is arranged immediately after the exit side of the rolling mill 4. However, immediately after the exit side of the rolling mill 4, there are the above-mentioned problems, and the tension meter roll is significantly damaged. Especially, the rolling reduction is 30-50%
When rolling under high pressure, a large amount of scale is peeled off from the hot-rolled steel strip, and a large amount of scale exists on the surface of the steel strip 2 on the exit side of the rolling mill 4. In this respect, in the present invention, the tension meter roll 7 is arranged at a position downstream of the ringer roll 6. At this position, there is no residual scale on the surface of the steel strip, and the tension meter roll 7 is not damaged by the scale piece. Alternatively, the tension meter roll 7 may be arranged between the brush roll 5 and the ringer roll 6.

Even if the tension meter roll 7 is arranged on the downstream side of the brush roll 5 or the ringer roll 6, the rotational power of the brush roll 5 is measured, and the thrust applied from the brush roll 5 to the steel strip 2 based on this is measured. The calculation does not impair the function of the tension meter roll 7. For example, the following correction formula actual tension = (tension meter)-(roll measuring tension) -K {(brush roll power)-(brush roll no-load power)} You can know exactly the tension applied to the band. Therefore, the original function of the tension meter roll 7 is not impaired, and damage to the roll peripheral surface due to the adhesion of scale pieces is prevented.

[0008]

As described above, according to the present invention, the hot-rolled steel strip to which the scale is attached is reduced by a rolling reduction of 30 to 5%.
When rolling and descaling at 0%, a tension meter roll for measuring the tension of the steel strip is arranged on the downstream side of the brush roll or the ringer roll. Therefore, after the scale pieces remaining on the surface of the steel strip immediately after rolling are removed from the surface of the steel strip by the brush roll, the steel strip comes into contact with the tension meter roll, and the scale pieces are attached to the circumferential surface of the tension meter roll. Will not adhere. Therefore, the tension meter roll is maintained in good surface properties for a long period of time and is stably used for tension measurement.

[Brief description of drawings]

FIG. 1 is a rolling line for a hot-rolled steel strip according to the present invention.

[Explanation of symbols]

1: Payoff reel 2: Hot-rolled steel strip with scale attached 3: Bridle roll on entry side 4: Rolling machine 5: Brush roll 6: Ringer roll 7: Tension meter roll

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuhiko Okano 5 Ishizu Nishimachi, Sakai City, Osaka Prefecture Nisshin Steel Co., Ltd.Sakai Works (72) Inventor Yoshiteru Moriyama 5 Ishizu Nishimachi, Sakai City, Osaka Nisshin Steel Co., Ltd. Sakai Works (72) Inventor Toshinori Miki 5 Ishizu Nishimachi, Sakai City, Osaka Prefecture Nisshin Steel Co., Ltd. Sakai Works

Claims (1)

[Claims] 1. A brush roll and a ringer are provided on the downstream side of a rolling mill for cold-rolling a hot-rolled steel strip with the scale still attached at a rolling reduction of 30 to 50% to remove or peel off the scale from the surface of the hot-rolled steel strip. A rolling device for a black skin hot coil in which rolls are arranged and a tension meter roll is arranged further downstream of the brush roll or the ringer roll.