JP3775415B2 - Steel strip manufacturing method that can prevent quality defects caused by foreign matter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a steel strip that can prevent foreign matter from adhering to a steel plate surface, and can prevent generation of quality defects due to foreign matters by removing foreign matter adhering to the steel plate surface, and more specifically, pickling equipment. , cold rolling equipment, due to foreign matter by continuous annealing equipment, to prevent the adhesion of foreign matters to the steel sheet surface is applied at input side of the steel plate manufacturing equipment such as surface treatment equipment, also for removing foreign matter adhered to the steel surface The present invention relates to a method of manufacturing a steel strip that can prevent the occurrence of quality defects .

  A beautiful surface quality is required for a cold-rolled steel sheet or a surface-treated steel sheet. After hot rolling, these steel sheets are used in steel plate manufacturing equipment such as pickling equipment, cold rolling equipment, continuous annealing equipment, surface treatment equipment, etc., and required for pickling descaling, cold rolling, heat treatment, plating treatment, etc. Processed and manufactured. If foreign matter adheres to the steel plate surface on the entry side of the steel plate manufacturing facility, quality defects will occur.

Conventionally, on the entrance side of steel plate manufacturing equipment such as pickling equipment, a brush roll that peels and removes foreign matter on the surface of the steel plate by rotating and contacting it, or a magnet that adsorbs and removes foreign matter that has not been removed as described above. It is generally performed behind the brush roll (for example, Patent Document 1, Patent Document 2, etc.).
Japanese Utility Model Publication No. 3-68912 JP-A-4-258309

  As the foreign matter adhering to the steel plate surface, (1) solidified metal powder called spatter generated during welding of steel plates on the entrance side of the pickling equipment, (2) chips by cutting of the weld bead portion, (3) steel plate Trimming scraps due to defective edge trimming, (4) Paint pieces from the top or outside of the factory building, dust fall, (5) Wear powder or cutting powder of resin coating rolls and resin rolls in steel plate manufacturing equipment, (6) There are solidified rolling oil, (7) other metal powders or paper pieces, and (8) mixed products of (1) to (7).

  However, in the case of using the brush roll or equipment having a magnet disposed behind it, it is possible to remove relatively large foreign matters and iron-based foreign matters resulting from the above (1) to (3). It is difficult to reliably remove foreign matters other than iron, minute foreign matters such as (4) or (5), and pressure-bonded foil-like foreign matters resulting from (4) to (8).

  That is, in the case of adhesion of minute foreign matter as in (4) or (5) above, the method using a brush roll that rotates and contacts the steel sheet passes through the gap of the brush, or once picked up by the brush roll falls or There is a problem of scattering and reattaching to the steel plate.

  In addition, in steel plate manufacturing equipment, there is a roll with high contact line pressure with the steel plate such as a helical turner that changes the traveling direction of the steel plate in a horizontal plane in order to directly connect a bridle roll or a plurality of orthogonal steel plate manufacturing equipment. . When the foreign matter resulting from (4) to (8) picked up by such a roll accumulates on the roll surface and is crimped to the steel plate again, the steel plate travels downstream of the equipment with the foreign matter attached. However, foreign objects are increasingly pressed into a foil shape as they come into contact with a plurality of downstream rolls. It is extremely difficult to remove such a foil-like foreign matter adhering to the steel plate surface by the equipment.

  Therefore, in the said equipment, generation | occurrence | production of the quality defect by the foreign material adhesion to the steel plate surface cannot fully be prevented.

The present invention has been made in order to solve such problems, and prevents a pressed foil-like foreign matter or a fine foreign matter other than iron from adhering to the steel plate, and prevents foreign matter attached to the steel plate. It aims at providing the manufacturing method of the steel strip which can prevent generation | occurrence | production of quality defects, such as pressing, a rolling mill, and a thread, by the foreign material adhering to the steel plate surface by removing.

  Means of the present invention for solving the above-mentioned problems are as follows.

(1) On the entry side of the steel sheet manufacturing facility, a roll whose contact linear pressure with the steel sheet is 3 kg / mm or more is made of a material in which static electricity due to friction with the steel sheet is not charged on the roll surface. A fluid spray is applied to the steel plate surface on the side in contact with the roll to remove foreign matters from the fluid spray provided on the plate, and the foreign matter removing device disposed behind the fluid spray adheres to the steel plate surface. A method for producing a steel strip capable of preventing the occurrence of quality defects caused by foreign matter, characterized by removing minute foreign matter.

(2) On the entrance side of the steel sheet manufacturing facility, a bridle roll or helical turner is made of a material that does not charge the surface of the roll due to friction with the steel sheet, and is provided in front of and / or behind the bridle roll or helical turner . A fluid is sprayed from the fluid spray to the steel plate surface on the side in contact with the bridle roll or the helical turner to blow off the foreign material, and attached to the steel plate surface by a foreign material removing device disposed behind the fluid spray. A method for producing a steel strip capable of preventing the occurrence of quality defects due to foreign matter, characterized by removing minute foreign matter.

(3) On the entry side of the steel plate manufacturing facility, foreign matter is ejected from the fluid spray provided in front of the roll having a contact linear pressure of 3 kg / mm or more to the steel plate surface in contact with the roll. In addition to removing the foil-like foreign matter that has been accumulated on the surface of the roll by spraying the fluid from the fluid spray provided behind the roll to the surface of the steel plate in contact with the roll, and then crimped to the steel plate A steel strip capable of preventing the occurrence of quality defects due to foreign matter, wherein fine foreign matter attached to a steel plate surface is removed by a foreign matter removing device disposed behind the fluid spray provided behind the roll. Manufacturing method.

(4) On the entry side of the steel plate manufacturing facility, fluid is sprayed from the fluid spray provided in front of the bridle roll or helical turner to the steel plate surface on the side in contact with the bridle roll or helical turner to remove foreign matter. In addition, the fluid is sprayed from the fluid spray provided behind the bridle roll or the helical turner to the steel plate surface on the side in contact with the bridle roll or the helical turner to accumulate on the bridle roll surface or the helical turner surface. After removing the foil-like foreign matter pressure-bonded to the steel plate, the fine foreign matter adhering to the steel plate surface is removed by the foreign matter removing device provided behind the fluid spray provided behind the bridle roll or the helical turner. manufacture of steel strip can be prevented from occurring quality defects due to foreign matter, characterized in that the removal Law.
(5) Static electricity due to friction with the steel sheet is not charged on the roll surface when the contact linear pressure with the steel sheet described in (3) is 3 kg / mm ² or more, or the bridle roll or helical turner described in (4). The manufacturing method of the steel strip which can prevent generation | occurrence | production of the quality defect by the foreign material as described in (3) or (4) characterized by using a material.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to prevent the fine foreign material other than the crimped foil-shaped foreign material and iron from adhering to a steel plate, and to remove the fine foreign material adhering to a steel plate reliably. As a result, it is possible to prevent quality defects such as squeezing, rolling milling, and grinding by foreign matter adhering to the steel sheet surface, and not only meet the increasingly demanding quality demands of consumers, but also improve product yield and reduce it. Steel sheets can be manufactured at low cost.

  The present invention will be further described below.

In the present invention, on the entry side of steel plate manufacturing equipment such as pickling equipment, cold rolling equipment, continuous annealing equipment, surface treatment equipment, etc., like a bridle roll or a helical turner that changes the traveling direction of the steel sheet in a horizontal plane, A fluid spray is provided at the front part and / or rear part of the roll having a high contact linear pressure with the steel plate, and a fluid such as high-pressure air is sprayed from the fluid spray onto the steel plate surface on the side in contact with the roll to blow off foreign matter.

  When the steel plate to which foreign matter has adhered passes through a roll having a high contact linear pressure with the steel plate, the foreign matter is picked up on the roll surface and accumulated in a foil shape. When the accumulated foil-like foreign matter is again pressed against the steel sheet and comes into contact with a plurality of downstream rolls, the foreign matter is increasingly pressed into a thinner foil shape, which makes it extremely difficult to remove the foreign matter with conventional foreign matter removal equipment.

  In the present invention, the foreign matter picked up on the roll surface is reduced by removing the foreign matter on the steel plate surface by the fluid spray provided in front of the roll having a high contact linear pressure. The fluid spray provided behind the roll with a high contact linear pressure removes foil-like foreign matter that is accumulated on the roll surface and then crimped to the steel plate from the steel plate surface, and is further pressed by the downstream roll and cannot be removed from the steel plate surface. To prevent it from becoming a foreign object. The fluid spray may be provided on both the front and rear of the roll having a high contact linear pressure with the steel plate, but may be provided on either one. When it is provided on one side, it is more effective to provide it behind the roll to prevent the formation of foil-like foreign matters that are difficult to remove from the steel sheet surface with the downstream roll.

In the present invention, the contact linear pressure with a steel plate is a value (T / B) obtained by dividing the tension (T) of a steel plate that is wound around a roll by the steel plate width (B). High rolls are intended for those having a contact line pressure of 3 kg / mm or more.

  The fluid to be ejected may be not only a gas such as high-pressure air but also a liquid such as pressurized water. It is desirable to adjust the fluid ejection direction in an appropriate direction so that foreign matter on the steel plate does not adhere to the steel plate surface again.

  Furthermore, a foreign matter removing device that sucks and removes foreign matter in contact with or close to the steel plate surface is disposed downstream of the fluid spray line in the line traveling direction, and adheres to the steel plate surface after removing the foreign matter by the fluid spray. Completely remove the minute foreign matter. As the foreign matter removing device, a dust collecting device provided with a rectangular suction / removal portion facing the steel plate surface can be used. It is desirable to surround the suction / removal part of the dust collector facing the steel sheet surface with a rectangular nylon brush or the like, and arrange the clearance between the suction / removal part and the steel sheet surface to be 0 to 5 mm. In the dust collector, the suction force is sufficient if suction is performed at a flow rate of about 50 m / s. The sucked / removed minute foreign matter is discharged out of the steel plate manufacturing facility through a pipe connected to the sucking / removing section.

Further, when a material capable of suppressing the generation of static electricity due to friction with the steel sheet is adopted for the roll having a high contact linear pressure, the effect of preventing foreign matter from adhering to and accumulating on the roll surface having a high contact linear pressure is further improved. The material capable of suppressing the generation of static electricity due to friction with the steel plate may be made of steel, but a highly conductive resin or the like can be employed. When the resin is employed, the resistivity is preferably 10 ¹⁰ Ω · cm or less.

  Further, a means for removing foreign matter by further contacting the steel plate surface in front of and / or behind the roll having a high contact linear pressure, and removing the foreign matter on the steel plate surface, the fluid spray and the foreign matter removing device The foreign matter removal effect can be further improved. As a means for removing foreign matter by bringing it into contact with the steel sheet surface, a brush roll that contacts and rotates with the steel sheet can be used. In this case, the effect of removing foreign matters can be improved by the brushing effect.

  Also, the dustproof roof is provided above the equipment for preventing and removing foreign matter on the steel sheet surface and the steel sheet manufacturing equipment, and the dustproof means for covering the side surface between the two facilities from the dustproof roof is housed to accommodate the steel plate manufacturing equipment. It is possible to prevent the falling foreign matter from the upper part of the building from attaching to the steel plate surface.

Ri by the present invention, a minute foreign object other than crimped foil foreign substances and iron is prevented from adhering to the steel sheet, and it is possible to reliably remove fine foreign matter adhering to the steel sheet. As a result, it is possible to prevent quality defects such as squeezing, rolling milling, and grinding by foreign matter adhering to the steel sheet surface, and not only meet the increasingly demanding quality demands of consumers, but also improve product yield and reduce it. Steel sheets can be manufactured at low cost.

FIG. 1 shows the main part of the equipment for preventing and removing the foreign matter on the steel sheet surface referred to in the description of one embodiment of the present invention, and FIG. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

1 and 2, 1 is a steel plate, 2 is a helical turner, 6 is a bridle roll composed of four rolls 6a to 6d, 7 is a steel plate manufacturing facility, 3a and 3b are front and rear of the helical turner 2, respectively. The spray header 4a, 4b is wound around the rolls 6a, 6b, respectively, and sprays a fluid such as high-pressure air on the steel plate surface and blows away foreign matter on the steel plate surface. The brush rolls arranged in such a manner, 5 is a dust collector, 8 is a dustproof roof, 9 is a side wall made of a vinyl chloride resin film, and 10 is a column supporting the dustproof roof and the side wall 9. The helical turner 2 is made of conductive MC nylon (trade name) having a resistivity of 10 ² Ω · cm.

  In the facility shown in FIG. 1, foreign matter tends to adhere to the upper surface of the steel plate in contact with the helical turner 2, so the spray headers 3 a, 3 b, brush rolls 4 a, 4 b, and the dust collector 5 are placed on the upper surface of the steel plate in contact with the helical turner 2. It is arranged.

  In the facility shown in FIG. 1, the steel plate 1 travels in the direction of the arrow, and the traveling direction of the steel plate 1 is changed in the horizontal plane by the helical turner 2, and then travels to the steel plate manufacturing facility 7 through the bridle roll 6. In the helical turner 2, since the contact linear pressure with the steel plate 1 is high, foreign matter is easily picked up. In this facility, the spray header 3a disposed in front of the helical turner 2 prevents high-pressure air from being injected onto the steel plate surface on the side in contact with the helical turner 2 to prevent foreign matter from being picked up by the helical turner 2. After spraying high pressure air from the spray header 3b disposed behind the helical turner 2 onto the steel plate surface in contact with the helical turner 2, the high pressure air is accumulated at the helical turner 2, and then the foreign matter pressed against the steel plate surface again is removed. Blow away and remove.

  Since the material of the helical turner 2 is excellent in electrical conductivity, static electricity due to friction with the steel plate 1 is not charged on the roll surface, so that the effect of preventing foreign matter from adhering to and accumulating on the surface of the helical turner 2 is excellent.

  It is equipped with brush rolls 4a and 4b that contact and rotate with the steel plate surface that is wound around the rolls 6a and 6b disposed behind the helical turner 2 and is not removed by the spray header 3b due to its brushing effect. Foreign matter can be removed from the steel plate surface.

  Further, a dust collector 5 is disposed at the downstream roll 6b position. The dust collector 5 includes a suction / removal unit 12 surrounded by a rectangular nylon brush 11 facing the steel plate surface supported by the roll 6b. In order to improve the sealing performance between the suction / removal part 12 and the steel plate surface and increase the suction / removal effect of foreign matter by the dust collector 5, the clearance between the suction / removal part 12 and the steel plate surface is set to 0 mm to 5 mm. It has been adjusted. Using the dust collector 5, the fine foreign matter adhering to the steel plate surface is more completely sucked and removed. The minute foreign matter sucked and removed is forcibly discharged out of the equipment through the pipe 13.

Since the dust prevention roof 8 is provided above the steel plate surface foreign matter adhesion prevention and removal equipment and the steel plate manufacturing equipment 7 according to the present embodiment, and the side surface between both the equipment from the dust protection roof 8 is covered with the side walls 9, It is possible to prevent foreign substances falling from the upper part of the building from adhering to the steel plate surface.

  With this equipment, it is possible to prevent the adhered foil-like foreign matters and fine foreign matters other than iron from adhering to the steel plate, and it is possible to reliably remove the fine foreign matters attached to the steel plate. As a result, it is possible to prevent quality defects such as squeezing / rolling / sleeving due to foreign matter adhering to the steel plate surface.

  1, the spray headers 3a and 3b are provided before and after the helical turner 2, but only one of them may be provided as necessary. In addition, although two brush rolls 4a and 4b are provided downstream of the spray header 3b, either one of them may be used, and if necessary, instead of the brush roll and / or in addition to the brush roll, A brush roll may be provided downstream of the spray header-3a, and if not necessary, the brush roll may not be provided.

  In the facility of FIG. 1, spray headers 3a and 3b, brush rolls 4a and 4b, and a dust collector 5 are disposed only on the steel plate surface side in contact with the helical turner 2, but the other steel plate surface side is provided if necessary. Or you may arrange | position a spray header and a dust collector, or also a brush roll on both surfaces.

  In the facility shown in FIG. 1, a helical turner 2 and a bridle roll 6 having a high contact linear pressure with a steel plate are connected. In this way, when a plurality of rolls having a high contact linear pressure with the steel plate are connected or close to each other, the apparatus may be arranged on a plurality of rolls, but one roll on which foreign matter is likely to adhere (The helical turner 2 in the installation of FIG. 1) may be selected and the device may be arranged for this roll.

INDUSTRIAL APPLICATION This invention can be utilized as a manufacturing method of the steel strip which can prevent generation | occurrence | production of the quality defect by a foreign material by preventing the foreign material adhering to a steel plate surface, and removing the foreign material adhering to a steel plate surface. More specifically, it prevents foreign matter from adhering to the steel plate surface applied to the entrance side of steel plate manufacturing equipment such as pickling equipment, cold rolling equipment, continuous annealing equipment, surface treatment equipment, etc. It can be used as a method for manufacturing a steel strip that can prevent the occurrence of quality defects due to foreign matter by removing

The figure which shows the principal part of the adhesion prevention and removal equipment of the steel plate surface foreign material referred to description of one Example of this invention. The figure which shows the AA cross section of the installation of FIG.

Explanation of symbols

1 Steel plate 2 Helical turner 3a, 3b Spray header (fluid spray)
4 Brush rolls 5 Dust collector (foreign material removal device)
6 Bridle roll 7 Steel plate manufacturing equipment 8 Dust-proof roof 9 Side wall (vinyl chloride resin film)
10 props

Claims (5)

On the entrance side of the steel sheet manufacturing facility, a roll whose contact linear pressure with the steel sheet is 3 kg / mm or more is made of a material that does not charge the roll surface with static electricity due to friction with the steel sheet, and is provided in front of and / or behind the roll . A fluid is sprayed from the fluid spray onto the steel plate surface on the side in contact with the roll to remove the foreign matter, and a fine foreign matter adhering to the steel plate surface is removed by a foreign matter removing device disposed behind the fluid spray. A method for producing a steel strip capable of preventing the occurrence of quality defects due to foreign matter, characterized by being removed. On the entry side of the steel plate manufacturing facility, the bridle roll or helical turner adopts a material that does not cause static electricity due to friction with the steel plate to be charged on the roll surface, and from the fluid spray provided in front of and / or behind the bridle roll or helical turner. A fine foreign matter adhered to the steel plate surface by a foreign matter removing device disposed behind the fluid spray while spraying fluid onto the steel plate surface on the side in contact with the bridle roll or the helical turner. A method for producing a steel strip capable of preventing the occurrence of quality defects due to foreign matter, characterized by removing the slag. On the entry side of the steel plate manufacturing facility, foreign matter is removed by spraying fluid from the fluid spray provided in front of the roll having a contact linear pressure of 3 kg / mm or more to the steel plate surface in contact with the roll. In addition, the fluid is sprayed from the fluid spray provided behind the roll to the steel plate surface on the side in contact with the roll to remove the foil-like foreign matter that is accumulated on the roll surface and then crimped to the steel plate, and the roll A method for producing a steel strip capable of preventing the occurrence of quality defects due to foreign matter, wherein fine foreign matter adhering to the steel sheet surface is removed by a foreign matter removing device disposed behind the fluid spray provided behind the fluid spray . On the entry side of the steel plate manufacturing facility, a foreign material is removed by spraying a fluid from a fluid spray provided in front of a bridle roll or a helical turner to a steel plate surface on the side in contact with the bridle roll or the helical turner, and After the fluid is sprayed from the fluid spray provided behind the bridle roll or the helical turner to the steel plate surface on the side in contact with the bridle roll or the helical turner, the steel plate is accumulated on the bridle roll surface or the helical turner surface. And removing the fine foreign matter adhering to the steel sheet surface by the foreign matter removing device disposed behind the fluid spray provided behind the bridle roll or the helical turner. A method for producing a steel strip capable of preventing the occurrence of quality defects due to foreign matters characterized by A material whose contact linear pressure with the steel sheet according to claim 3 is 3 kg / mm ² or more, or a bridle roll or helical turner according to claim 4 is made of a material that does not cause static electricity due to friction with the steel sheet on the roll surface. A method for producing a steel strip capable of preventing the occurrence of quality defects due to the foreign matter according to claim 3 or 4 .

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