JPH10216836A - Method for brushing metallic strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a load in pickling in a succeeding process by suppressing the uneven grinding of both edge parts in the width direction of the metallic strip, and to provide the method for brushing the metallic strip, by which workability can be improved. SOLUTION: In the method for brushing the metallic strip, by which the surface of the metallic strip 10 is ground or cleaned by brushing the metallic strip 10 by brushing devices 14 and 18 through two threading rolls 12, 16 or more, after brushing the metallic strip 10 having a warp C formed by the first threading roll 12, brushing is performed after forming a warp C in the reverse direction by the succeeding threading roll 16 to the warp C of this brushed metallic strip 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can prevent unevenness in grinding and cleaning in the width direction of a strip, particularly at both edges, when grinding, removing scale, removing oil, and cleaning the surface of a metal strip. The present invention relates to a method for brushing a metal strip.

[0002]

2. Description of the Related Art Conventionally, as a method of brushing a metal strip, shot blasting (pre-treatment) is performed on the metal strip as a pretreatment in order to reduce the load in pickling of a metal strip symmetrical to special steel such as general steel or stainless steel. After performing SB), brushing with a brush roll is performed to remove scale on the surface of the strip. As shown in FIG. 6, the cross section of the scale of the metal strip has a bottom (B) where a crack is formed by shot blasting.
Part) and a mountain part (part A) where cracks are not formed.
In brushing, almost all scales at the peaks where cracks are not formed are removed, but the bottom where cracks are formed remains. The remaining mountain scale where cracks are not formed and the scale at the bottom where cracks are formed are removed by subsequent pickling.However, depending on how much the scale of the peak can be removed by brushing, subsequent pickling is performed. The degree of load reduction is greatly affected.

In conventional brushing equipment B, FIG.
(A) As shown in FIG.
Brushing is performed after the flatness of the metal strip 34 in the width direction is corrected by the C-warpage correction devices 32 and 33 provided on the upstream side of the brushing devices 30 and 31 respectively. As shown in part b of FIG. 7 (B), the C warp straightening devices 32 and 33 have one piece on the upper surface of the central part of the metal strip 34 in order to straighten the metal strip 34 warped upwardly. Shape correction rolls 32a, 33a,
Two shape correcting rolls 32b, 32c and 33b, 33c are provided on the lower surface of both ends of the metal strip 34. The upper and lower brush rolls 30a, 30b and 31a, 31b of the brushing devices 30, 31 are composed of rotating grindstones. Note that a to c shown in FIGS.
The parts represent corresponding positions. Japanese Patent Application Laid-Open No.
No. 228224.

[0004]

However, the conventional metal strip brushing method has the following problems to be solved. As shown in FIG. 7B, in the brushing method using the conventional C warp correcting devices 32 and 33, the metal strip 34 is flattened (M-shaped) by the C warp correcting devices 32 and 33, but the brushing device 30 is used. , 31 in the width direction of the metal strip 34 are formed such that the upper portions are convex near both edges as shown in a portion c. Therefore, in this state, even if the metal strip 34 is ground by the upper and lower brush rolls 30a, 30b and 31a, 31b of the brushing devices 30, 31, the two edge portions are not removed due to the strength of the brush and partial excessive grinding. Insufficient amount of reduction occurs, and the lower surface side of the convex portion is not sufficiently ground, and a part of the scale remains, causing uneven band-like grinding in the longitudinal direction of the metal strip 34. As a result, the load in the subsequent pickling is increased, that is, the passing speed of the sulfuric acid descaling must be reduced, and thus the workability is poor and the operating cost is increased.

FIG. 8 shows an example of the distribution of grinding characteristics in the width direction of the metal strip 34 by brushing using the brushing equipment B. The horizontal axis represents the distance from the drive side in the width direction of the metal strip 34, and the vertical axis represents the degree of unevenness in the grinding after brushing (or the amount of residual scale), measured in black and white density (measured with an instrument for quantifying blackness). It is indicated by. The solid line in the figure represents the front surface of the metal strip 34, and the broken line represents the back surface. As the experimental conditions, the transport speed of the metal strip 34 was 20 m / min, the line speed of the shot blast was 20 m / min, and the brush roll 30 was used.
a, 30b and the rotation speed of 31a, 31b are 1200 rpm
m (diameter 420 mm), reduction 2 mm, number of passes 1
Times, the thickness of the metal strip 34 is 3 mm and the width is 1000
mm. Although the number of times of the brushing pass can be increased, the black-and-white density is reduced by the increase, but there is also a problem that the grinding unevenness remains.

[0006] The present invention has been made in view of such circumstances, and by suppressing the unevenness of the grinding at both edges in the width direction of the metal strip and by cleaning the surface including scale and oil removal, the subsequent acid strip. While reducing the load on washing,
An object of the present invention is to provide a metal strip brushing method that can improve workability.

[0007]

According to the present invention, there is provided a semiconductor device comprising:
The method for brushing a metal strip according to the first aspect of the invention is a method for brushing a metal strip by brushing the metal strip with a brushing device through two or more passing rolls to grind or clean the surface of the metal strip. After brushing the metal strip having C warpage formed by the passing roll,
The C-warp of the brushed metal strip is brushed by forming a C-warp in the opposite direction by the next pass-through roll.

According to a second aspect of the present invention, in the brushing method for a metal strip according to the first aspect, in the brushing device, a central portion in a width direction of the metal strip is provided downstream of the threading roll. A warp straightening device having a shape straightening roll at each of both edges is provided to straighten both edges of the C-warp. According to a third aspect of the present invention, in the brushing method of a metal strip according to the first or second aspect, the passing plate roll is a straight-body type roll.
In the brushing method for a metal strip according to a fourth aspect, in the brushing method for a metal strip according to the first or second aspect, the passing plate roll is a drum-type roll.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a schematic configuration diagram of a brushing facility A to which a metal strip brushing method according to a first embodiment of the present invention is applied. It should be noted that the scale described below is a peak (A) shown in FIG.
Represents the scale of.

As shown in the figure, a brushing equipment A to which a metal strip brushing method according to a first embodiment of the present invention is applied, a metal strip 10 which has been shot blasted and conveyed is turned upward. A threading roll 11 for converting, a threading roll 12 for horizontally transforming the metal strip 10 sent from the threading roll 11, and a C of the metal strip 10 sent from the threading roll 12. A front-stage C warp correcting device 13 for correcting warpage, a front-stage brushing device 14 for brushing the scale of the metal strip 10 whose C-warp has been corrected by the front-stage C warp correcting device 13, and a front-stage brushing device 14.
And a stripping roll 16 for turning the metal strip 10 from which most of the scale has been removed downward, and for turning the metal strip 10 sent from the stripping roll 15 in the horizontal direction. And a post-stage C warp straightening device 17 for correcting the C warpage of the metal strip 10 sent from the threading roll 16, and a remaining scale of the metal strip 10 whose C warpage has been corrected by the post-stage C warp straightening device 17. -Stage brushing device 18 for brushing
And a passing roll 19 for turning the metal strip 10 from which scale has been almost completely removed by the subsequent brushing device 18 upward, and turning the metal strip 10 sent from the passing roll 19 in the horizontal direction. And a passing plate roll 20 for carrying out. Hereinafter, these will be described in detail.

The passing rolls 11, 12, 15, 16, 19, and 20 for changing the conveying direction of the metal strip 10 are the same, and have a straight body shape and a steel roll having the same cross section. Before correcting the C warpage of the metal strip 10 sent from the threading rolls 12 and 16, the rear-stage C warp correcting devices 13 and 17 respectively perform the shape correcting rolls 13a as shown in portions b and f of FIG. , 13b, 13c and shape correction rolls 17a, 17b, 17c. Here, the shape correcting rolls 13a and 17a arranged at the center of the metal strip 10 are connected to the front-stage C warpage correcting device 1.
3 is arranged on the upper side, while the rear-stage C warp straightening device 17 is arranged at the lower side, and the shape straightening rolls 13b, 13c and 17b, 17c arranged at both ends of the metal strip 10 are located at the lower portion of the front-stage C warp straightening device 13, On the other hand, it is arranged at the upper part in the rear-stage C warp correcting device 17. The shape correcting rolls 13a, 13b, 13c, 17a, 17b, 17c
Are substantially the same, and are made of metal rolls like the conventional shape correction rolls.

The front and rear C warp straightening devices 13 and 17
Before and after brushing the scale of the metal strip 10 in which the C warpage has been corrected, the subsequent brushing devices 14 and 18 are used.
The upper and lower brush rolls 14a, 14b and 1
8a and 18b are made of a rotating grindstone, similarly to a conventional brush roll.

A method and operation of brushing a metal strip according to the first embodiment of the present invention using the brushing facility A having such a configuration will be described. FIG.
2 and a part to h part shown in FIG. 2 indicate corresponding positions. The shot blasted metal strip 10 is turned upward by the threading roll 11 and sent to the threading roll 12, and the metal strip 10 turned horizontally by the threading roll 12 is subjected to the pre-C warping correction. It is transported to the device 13. The state of the C warpage of the metal strip 10 at a position immediately before the front-stage C warp straightening device 13 is, as shown in part b of FIG. After passing through the plate roll 12, the back surface that has been in contact with the roll is compressed in the transport direction, while the front surface is subjected to tension.) Therefore, the central portion is upwardly convex. The metal strip 10 whose central part is convex upward is formed by the shape correcting rolls 13 a and 13 of the front-stage C warpage correcting device 13.
b, 13c and the pre-stage brushing device 14
And the scale is brushed by the pre-stage brushing device 14.

In the state of the C-warping of the metal strip 10 in the pre-stage brushing device 14, as shown in part c of FIG. 2, the vicinity of both edges is formed with a convex upper side, and the lower surface of this portion is depressed. . Therefore, in this state, even if the lower surfaces near both edges are ground by the upper and lower brush rolls 14a and 14b of the pre-stage brushing device 14, the scale of this portion is not sufficiently ground, and a part of the scale remains, and the ground remains. Unevenness will occur. However, the metal strip 10 in which the grinding unevenness remains remains on the threading rolls 15 and 1.
6, by the same mechanism as described above, the state of the C warpage of the metal strip 10 at a position immediately before the rear-stage C warp correcting device 17 is such that the center portion is convex downward as shown in the f section of FIG. In this state, the sheet is conveyed to the rear-stage C warp straightening device 17, and in the rear-stage C warp straightening device 17, as shown in a part g of FIG. Rolls 17a, 17b,
17c, the vicinity of both edges of the metal strip 10 where the grinding unevenness remains is formed in a convex shape downward.
By the brush roll 18b below the second-stage brushing device 18, the grinding unevenness portion is brushed, and the remaining scale is almost completely removed.

The metal strip 10 from which the uneven grinding portion has been brushed and the scale has been almost completely removed is then sent through picking rolls 19 and 20 to the pickling treatment step, where the bottom portion (where cracks are formed) is formed. The scale of part B) is removed. As described above, in the metal strip brushing method according to the first embodiment, the first pass C warpage (upwardly convex in this embodiment) and the second pass C warp are caused by the threading rolls 12 and 16. (In the present embodiment, downwardly convex), and the front-stage C warp straightening device 13 and the rear-stage C warp straightening device 17 arranged upstream of the front-stage brushing device 14 and the rear-stage brushing device 18. In addition, it is possible to substantially completely remove the uneven grinding portions at both ends of the metal strip generated in the preceding stage in the following stage.

[0016]

EXAMPLE The result of an actual machine test using an actual metal strip will be described. As the experimental conditions, the transport speed of the metal strip 10 was 20 m / min, the line speed of the shot blast was 20 m / min, and the brush roll 14 was used.
a, 14b and the rotation speed of 18a, 18b are 1200r
pm (diameter 420 mm), the reduction amount is 2 mm, the number of passes is 1, the thickness of the metal strip 10 is 3 mm, and the width is 1
000 mm. The results are shown in FIG. 4. Compared with the conventional example (FIG. 8), the scales at both edges were removed because the unevenness of the first brush was corrected and the next brush was easy to hit. It can be seen that the grinding unevenness was substantially eliminated.

FIGS. 3A and 3B show modifications of the brushing equipment A. FIG. In the above-described embodiment, a roll having the same cross section (a straight body type) is used as a passing roll, but a drum-shaped roll can be used as shown in the figure.
When a drum-shaped roll is used, the force of imparting the C-warp and correcting the C-warp in reverse is stronger than when a straight-body-type roll is used, so that the shape of the C-warp can be stabilized. There is an advantage. In addition, this modification example is the threading roll 1
Only the structure of 2a, 15a, 16a, and 19a is changed, and the other structure is the same as the brushing equipment A, and the operation and effect are substantially the same.

In the brushing facility A, the threading rolls 11 (11a) and 20 (20a) at both ends may be unnecessary depending on the arrangement of the preceding and following processing steps. In addition, the passing rolls 15 (15a) and 19 (19a) can be omitted if necessary. In the present embodiment,
Although the shape correction rolls are used as the front and rear C warpage correcting apparatuses, the present invention is not limited to this as long as the means can correct the C warpage of the metal strip. Further, in the present embodiment, the number of the shape correction rolls of the front and rear-stage C warp correction devices is three, but a plurality of rolls divided in the roll width direction are used as needed while keeping the pressing position. Three sets of shape correction rolls are also possible. Further, the brushing device is provided in two stages, a former stage and a latter stage, and is arranged in series in the line. However, it is also possible to reverse the metal strip as one device. However, in this case, the front and rear stages C
The warp straightening device is disposed before and after the brushing device, and the front and rear C warp straightening devices disposed before and after the brushing device enable the C warpage in the reverse direction to be corrected. In addition, the number of stages is not limited to one or two, and three or more stages are also possible.

Next, FIG. 5A shows a schematic configuration diagram of a brushing facility A1 to which a metal strip brushing method according to a second embodiment of the present invention is applied. The brushing equipment A1 is substantially the same as the brushing equipment A, except that the threading roll 11 (11a), the front-stage C warpage straightening device 13, the threading roll 15 (15a), the rear stage C warpage straightening device 17, and the threading roll 19 ( 19a) and threading roll 20
(20a) is omitted. A description will be given of a metal strip brushing method and operation according to the second embodiment of the present invention using the brushing equipment A1 having such a configuration. Note that a shown in FIGS. 5A and 5B
The part and the b part represent corresponding positions, respectively.

The shot blasted metal strip 10 is sent to a passing roll 12,
And is conveyed to the pre-stage brushing device 14 via the. The state of the C-warp of the metal strip 10 at a position immediately before the pre-stage brushing device 14 occurs in the metal strip along the outer periphery of the roll in the threading roll 12 as described above, as shown in a part a of FIG. Due to internal stress (the back surface that has been in contact with the roll after passing through the passing roll 12 is compressed in the transport direction, while the front surface is subjected to tension), the central portion is upwardly convex. The scale is brushed by the upper and lower brush rolls 14a and 14b of the preceding-stage brushing device 14 on the metal strip 10 whose central portion is convex upward.

In the pre-stage brushing device 14, the C warpage of the metal strip 10 is reduced by the upper and lower brush rolls 14.
Since it is necessary to maintain the appropriate amount of reduction (amount of pushing in the roll) of a and 14b, the upper scale near both edges and the lower scale at the center are not sufficiently ground, and some scale remains. Grinding unevenness remains. However, when the metal strip 10 having the remaining grinding unevenness is further passed through the passing roll 16, the state of the C warp of the metal strip 10 at the position immediately before the subsequent-stage brushing device 18 is shown in FIG. As shown in part (b) of (B), the central part is convex downward, and in this state, the upper and lower brush rolls 18a, 1
With the appropriate amount of reduction of 8b, the grinding unevenness portion is brushed, and the remaining scale is almost completely removed.

The metal strip 10 whose grinding unevenness has been brushed and whose scale has been almost completely removed is then sent to a pickling treatment step through a not-shown passing roll, where the bottom (B) where cracks are formed is formed. Part) is removed. As described above, in the metal strip brushing method according to the second embodiment, in the metal strip 10 in front of the pre-stage brushing device 14, the C warpage (in the present embodiment, upwardly convex) is caused by the threading rolls 12 and 16. Shape) and the C warpage (in the present embodiment, convex downward) of the metal strip 10 in front of the rear-stage brushing device 18, thereby lowering the upper and central portions near both edges remaining in the front-stage brushing device 14. The scale on the side will be almost completely removed by the subsequent brushing device 18. In the above-described embodiment, the C-warp in the width direction of the metal strip in the preceding stage is made upwardly convex, and the C-warp in the width direction of the metal strip in the latter stage is made downwardly convex. The invention applies. In addition, as an embodiment of the present invention, removal of scale and the like by grinding has been described, but the invention can be similarly applied to removal of oil content and surface cleaning of a metal strip.

[0023]

In the brushing method for a metal strip according to any one of claims 1 to 4, after the metal strip having the C warpage formed by the first threading roll is brushed, the C warpage of the brushed metal strip is removed. Since the brushing is performed by forming a reverse C warp by the next sheet passing roll, the upper scale near both edges and the lower scale at the center portion are not sufficiently ground by brushing by the preceding brushing device, and some scales are reduced. Even if it remains and grinding unevenness occurs, the subsequent brushing device
This grinding uneven portion is brushed, and the remaining scale is almost completely removed. Therefore, the load in the subsequent pickling can be reduced, and the workability can be improved. In particular, in the metal strip brushing method according to the second aspect, a warp straightening device having a shape straightening roll at each of a widthwise central portion and both edge portions of the metal strip is provided downstream of the passing plate roll, and C warpage is provided. Since both edges are corrected, the scale near both edges is sufficiently ground. In the brushing method for a metal strip according to the third aspect, since the threading roll is a straight roll, it is possible to provide an easy-to-manufacture and inexpensive apparatus. Further, in the brushing method of the metal strip according to the fourth aspect, since the threading roll is a drum-shaped roll, the formation of the C-warp becomes easier and the brushing becomes easier.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a brushing facility to which a metal strip brushing method according to a first embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram of a cross-sectional shape in a width direction of a metal strip.

FIGS. 3A and 3B are schematic configuration diagrams and a cross-sectional shape of a metal strip in a width direction of a modification of a brushing facility to which a metal strip brushing method according to a first embodiment of the present invention is applied, respectively. FIG.

FIG. 4 is an explanatory diagram illustrating an example of a grinding characteristic distribution in the width direction of the metal strip by the metal strip brushing method according to the first embodiment of the present invention.

FIGS. 5A and 5B are schematic configuration diagrams of a brushing facility to which a metal strip brushing method according to a second embodiment of the present invention is applied, and a description of a cross-sectional shape of the metal strip in a width direction. FIG.

FIG. 6 is a sectional view of a metal strip formed by shot blasting and brushing.

7A and 7B are a schematic configuration diagram of a brushing facility according to a conventional example and an explanatory diagram of a cross-sectional shape of a metal strip in a width direction, respectively.

FIG. 8 is an explanatory view showing an example of a distribution of grinding characteristics in a width direction of a metal strip by a metal strip brushing method according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS A Brushing equipment A1 Brushing equipment 10 Metal strip 11 Passing roll 11a Passing roll 12 Passing roll 12a Passing roll 13 Front C warping straightening device 13a Shape straightening roll 13b Shape straightening roll 13c Shape straightening roll 14 Front brushing device 14a Brush roll 14b Brush roll 15 Passing roll 15a Passing roll 16 Passing roll 16a Passing roll 17 Rear C warp straightening device 17a Shape straightening roll 17b Shape straightening roll 17c Shape straightening roll 18 Rear brushing device 18a Brush roll 18b Brush roll 19 Roll 19a Passing roll 20 Passing roll 20a Passing roll

Claims (4)

[Claims] 1. A method for brushing a metal strip by brushing a metal strip with a brushing device via two or more rolls of a stripping material to grind or clean the surface of the metal strip, comprising: After brushing the metal strip having the formed C-warp, the C-warp of the brushed metal strip is brushed by forming a C-warp in the opposite direction by the next passing roll. Brushing method for metal strip. 2. In the brushing device, a warp straightening device having a shape straightening roll at a central portion in a width direction and both edge portions of the metal strip is provided on a downstream side of the threading roll. The method for brushing a metal strip according to claim 1, wherein the edge portion is straightened. 3. The method for brushing a metal strip according to claim 1, wherein the thread passing roll is a straight roll. 4. The method for brushing a metal strip according to claim 1, wherein said thread passing roll is a drum roll.