JP3020864B2 - Rolling equipment for stainless steel strip and method of rolling stainless steel strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold rolling apparatus for a stainless steel strip and a method for cold rolling a stainless steel strip.

[0002]

2. Description of the Related Art A stainless steel strip is generally rolled by a Sendzimir rolling mill. The steel strip supplied to the rolling mill is rolled through several passes to a predetermined thickness. The steel strip supplied to the cold rolling mill has been subjected to base plate annealing and pickling after hot rolling, or grain boundary erosion caused by barge or pickling with a grinder or the like. There is one in which material defects such as grooves are removed. However, at present, generally, even if there is a foreign substance on the surface of the steel strip, it is rolled as it is.

[0003] As surface defects of the steel strip generated by cold rolling, there are roll marks formed by rolling hard foreign substances such as metal pieces attached to the surface of the steel strip together with the steel strip, and rubber powder adhering to the steel strip surface. Biting flaws caused by rolling the soft foreign material together with the steel strip can be cited. As a technique for preventing such a surface defect of a steel strip, for example, Japanese Unexamined Patent Publication No.
Japanese Patent No. 58309 discloses that a brush-type plate surface cleaning device is used to increase a brush rotation speed or a brush rolling force near a welding point of a steel strip to remove hard foreign substances adhering to a surface. An operation method has been proposed in which the brush rotation speed or the brush rolling force is reduced. According to this method, generation of roll mark flaws due to hard foreign matter can be prevented, and the life of the brush is increased. However, such a cleaning method using a brush has a problem that, in a steel type such as a stainless steel strip which requires a glossy surface, a bite flaw is generated due to the depilation of the brush, which causes a deterioration in quality. there were.

Conventionally, a method of cleaning a steel strip in a reverse rolling mill has been performed by spraying a rolling oil between a wiping device 18 and a work roll 16 as shown in FIG. However, in such a method, the removed foreign matter is mixed into the rolling oil, and the removed foreign matter is caught in the work roll 16 together with the rolling oil, the roll is dented, transferred to the steel strip and becomes a convex. There is a problem that the steel strip becomes bitten, bites, or directly adheres to the steel strip.

[0005]

DISCLOSURE OF THE INVENTION The present invention advantageously solves the above-mentioned problems, and a rolling equipment for a stainless steel strip capable of producing a high-gloss high-quality stainless steel strip and a method for rolling a high-gloss high-quality stainless steel strip. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION The present invention provides a payoff reel 2 for paying out a steel strip, and a stainless steel strip 1 which is paid out.
Tension reel 3a for winding the steel strip after rolling, and a second tension reel 3b for winding the steel strip after being unwound from the first tension reel 3a and reverse-rolled.
A plurality of deflector rolls 4 for changing the traveling direction of the steel strip; a multi-high rolling mill 15 disposed between the tension reels 3a and 3b for rolling the steel strip;
Cleaning device 5 disposed between the first tension reel 3b and the second tension reel 3b for removing foreign matter adhering to the surface of the discharged steel strip.
And a rolling oil supply / recovery device 11 comprising a tank 9 for supplying rolling oil and a cleaning liquid to the multi-stage rolling mill 15 and the cleaning device 5, a tank 7 for recovery, and a filtration device 8 for regeneration.
The cleaning device 5 is provided with a wiping device 6 on the entrance and exit sides of the device, and a high-pressure spray 5a.
The high-pressure spray 5a includes a rolling oil supply and recovery device 1
The cleaning liquid supplied from 1 is used, and the used cleaning liquid is immediately returned to the rolling oil supply and recovery device 11. Further, in the present invention, in a method of rolling a stainless steel strip 1 from a pay-off reel 2, rolling the stainless steel strip by a multi-high rolling mill 15 and winding the stainless steel strip on a tension reel 3, the stainless steel strip is paid out from the pay-off reel 2. Thereafter, in a cleaning device 5 provided on the line and having a wiping device 6 on an entrance side and an exit side, a cleaning step of spraying a cleaning liquid onto the front and back surfaces of the stainless steel strip with a high-pressure spray 5a to remove foreign matter is performed. And a high-gloss, high-quality stainless steel strip rolling method.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIG. 1, which is an embodiment of the present invention. The stainless steel strip 1 is paid out from the pay-off reel 2, the direction is changed by a deflector roll 4, and the foreign matter adhering to the surface is removed by a cleaning device 5 through a wiping device 6 (here, a pinch roll). .

In the cleaning device 5, the cleaning liquid is sprayed with a high-pressure spray 5.
The method of spraying the surface with a and removing the adhered foreign matter is preferable. The cleaning liquid used in the cleaning device 5 is supplied from the rolling oil supply and recovery device 11. The sprayed washing liquid is collected by the washing liquid collecting device 5b, passes through the pipe 12, and is stored in the collecting tank 7 of the rolling oil supply and collecting device 11. The cleaning liquid is sent from the recovery tank 7 to the filtration device 8 by the pump 13a, and the filtration device 8 removes foreign substances and is regenerated. The regenerated washing liquid is sent to the supply tank 9, and is sent again to the high-pressure spray 5a by the pump 13b for use. In addition, following the filtration device 8, you may pass through the oil cooler 10 as needed. As a result, since the surface of the steel strip is cleaned and then sent to the rolling mill, the probability of foreign matter being mixed in the rolling mill is significantly reduced, and the occurrence of poor quality such as convexity, biting flaws, and dirt of the product is greatly reduced. Decrease. Also,
The occurrence of roll dents is also reduced. Further, since the cleaning liquid also removes foreign matter by the filtration device 8, a clean liquid is always blown out from the high-pressure spray 5a.

The rolling oil supply / recovery device 11 is provided with another pump 1
The rolling oil of the multi-high rolling mill 15 is also supplied by 3c. At the time of rolling, the rolling oil is supplied from the supply tank 9 of the rolling oil supply / recovery device 11 to the rolling oil supply header 17 in the rolling mill by the pump 13c. The rolling oil used in the rolling mill is collected by the rolling oil collecting device 14, collected in the collecting tank 7, and sent to the filtering device 8 by the pump 13a as described above. You. The recycled rolling oil is reused via the oil cooler 10 as needed. By sharing the cleaning liquid and the rolling oil, there is no problem even if the cleaning liquid and the rolling oil are directly mixed into the rolling mill. Further, in addition to the effect that the equipment cost can be reduced, the number of times of the visual inspection of the steel strip can be reduced, and the effect that the productivity is improved can be expected.

The cleaning device 5 is used only for the first pass, and stops after the second pass since the rolling is performed between the tension reels 3a and 3b. The wiping devices 6 provided on the entrance side and the exit side of the cleaning device 5 are preferably of a pinch roll type. By being driven as a pinch roll system, it is possible to clean even at the time of threading (passing), and it is possible to clean the front end portion where foreign matter is attached most, and the effect is further increased.

The stainless steel strip 1 from which foreign matter has been removed by the cleaning device 5 is sent to a multi-stage rolling mill 15 where it is rolled by a work roll 16, turned by a deflector roll 4 and wound on a first tension reel 3a. . Next, it is sent from the first tension reel 3a to the rolling mill 15 and rolled,
It is wound on a second tension reel 3b (shown by a dotted line in FIG. 1). After performing such reverse rolling several times, the sheet is rolled to a predetermined thickness.

The multi-high rolling mill 15 is preferably a multi-high Sendzimir rolling mill, but is not limited thereto. Cluster rolling mills and tandem rolling mills are also applicable. In order to prevent the rolling oil in the rolling mill from flowing out of the rolling mill, it is preferable to install the wiping devices 18 on the entrance side and the exit side of the rolling mill. As shown in FIG. 2, the discharged steel strip may be straightened by the rubber 19 depending on the shape.

The stainless steel strip 1 is provided by a threading table 20 from the washing device 5 to the multi-high rolling mill 15.
Is transported.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a rolling plant of the present invention having a washing device shown in FIG. 1, after a stainless steel strip is paid out from a pay-off reel, in a washing device provided with a wiping device by a pinch roll on an entrance side and an exit side, After passing through a washing step of spraying rolling oil onto the front and back surfaces of the steel strip by high-pressure spray to remove foreign substances, the steel strip was rolled by a Sendzimir rolling mill and wound on a first tension reel. Thereafter, reverse rolling was performed between the first tension reel and the second tension reel to roll to a predetermined plate thickness (0.3 to 2.0 mm). Rate of occurrence of roll flaws when rolling 1070 stainless steel strip coil (= number of coils with roll flaws / number of inspected coils)
Is shown in FIG. Next, in a rolling facility without a washing facility shown in FIG. 4, the stainless steel strip was discharged, immediately rolled by a rolling mill, and wound up by a tension reel. Further, reverse rolling of 3 to 13 passes is performed,
The thickness was set to a predetermined value (0.3 to 2.0 mm). FIG. 3A shows the rate of occurrence of roll flaws when such rolling is carried out by 1070 coil rolling as a comparative example. In addition, the glossiness after bright annealing was measured in accordance with JIS rules for the stainless steel strips of the above-described present invention examples and comparative examples, and the results are shown in FIG. 3 (b). The examples of the present invention show higher glossiness than the comparative examples.

By using the rolling equipment of the present invention to perform rolling by the method of the present invention, the occurrence of roll flaws is greatly reduced, and high gloss and high quality are obtained, as compared with the case where the rolling is carried out without a cleaning equipment. It can be seen that the stainless steel strip can be rolled.

[0016]

According to the present invention, the occurrence of surface defects due to the incorporation of foreign matter is suppressed, and a high-gloss and high-quality stainless steel strip can be stabilized and can be manufactured with high productivity. Furthermore, the present invention significantly reduces the frequency of roll grinding,
The effect of reducing the roll grinding cost can also be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a stainless steel strip rolling facility according to one embodiment of the present invention.

FIG. 2 is a schematic explanatory view of a stainless steel strip rolling facility according to another embodiment of the present invention.

FIG. 3 is a graph showing a comparison between a roll flaw generation rate and a glossiness in a stainless steel strip.

FIG. 4 is a schematic explanatory view of a conventional stainless steel strip rolling facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stainless steel strip 2 Payoff reel 3a First tension reel 3b Second tension reel 4 Deflector roll 5 Cleaning device 5a High pressure spray 5b Cleaning liquid recovery device 6 Wiping device 7 Recovery tank 8 Filtration device 9 Supply tank 10 Oil cooler 11 Rolling Oil supply and recovery device 12 Piping 13a Pump 13b Pump 13c Pump 14 Rolling oil recovery device 15 Multi-high rolling mill 16 Work roll 17 Rolling oil supply header 18 Wiping device 19 Raffle vera 20 Threading table

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akinobu Shinmaru 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (56) References JP-A-8-24936 (JP, A) JP-A-6-99203 (JP, A) JP-A-2-15817 (JP, A) JP-A-2-93006 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 3 / 02 B21B 1/36 B21B 45/02

Claims (3)

(57) [Claims] 1. A pay-off reel 2 for dispensing a steel strip, a first tension reel 3a for winding the dispensed stainless steel strip 1 after rolling, and a reverse rolling process performed by unwinding the first tension reel 3a. A second tension reel 3b for winding the steel strip later, a plurality of deflector rolls 4 for changing the traveling direction of the steel strip, and a multi-high rolling mill arranged between the tension reels 3a and 3b for rolling the steel strip 1
5, a cleaning device 5 disposed between the payoff reel 2 and the second tension reel 3b for removing foreign matter adhering to the surface of the dispensed steel strip, the multi-high rolling mill 15 and the cleaning device 5 A high-gloss and high-quality stainless steel strip rolling equipment comprising a rolling oil supply / recovery device 11 including a tank 9 for supplying rolling oil and a cleaning liquid, a collecting tank 7 and a regenerating filtration device 8. 2. The cleaning device 5 includes a wiping device 6 disposed on an inlet and an outlet of the device, and a high-pressure spray 5.
a, wherein the high-pressure spray 5 a uses a cleaning liquid supplied from the rolling oil supply and recovery device 11, and the used cleaning liquid is immediately returned to the rolling oil supply and recovery device 11. The rolling equipment for a stainless steel strip according to claim 1. 3. A method for rolling a stainless steel strip 1 from a pay-off reel 2 and rolling the stainless steel strip 1 by a multi-stage rolling mill 15 and winding the stainless steel strip 1 on a tension reel 3, wherein the stainless steel strip 1 is paid out from the pay-off reel 2. After that, a high-pressure spray 5 is placed in a cleaning device 5 provided on the line and having a wiping device 6 on an inlet side and an outlet side.
a high-gloss and high-quality stainless steel strip rolling method, wherein a rolling step is carried out by spraying a cleaning liquid onto the front and back surfaces of the stainless steel strip to remove foreign substances.