JPH10146604A - Roll for rolling checkered steel plate and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stock which uniformizes the height of the stripe of a checkered steel plate by changing the upper width of groove, lower width of groove and inclined angle of groove in accordance with the position in the width direction of a rolling roll for checkered plates or in accordance with the position from the end parts of the checkered steel plate. SOLUTION: In each surface in the endmost part, end part and middle part in the width direction of the rolling roll for the checkered steel plates, the groove having the upper width of groove and lower width of groove which are larger than the upper width L of groove and lower width W of groove of the groove which is provided in the middle part is provided in the endmost part. The height of the stripe of the checkered steel plate is made uniform by rolling a steel plate using the rolling rolls on the end parts of which the groove having the upper width of groove and lower width of groove which are wider than the upper width L and lower width W of groove of the groove in the endmost part. Further, in each surface of the endmost part, end part and middle part in the width direction of the rolling roll for the checkered steel plate, the groove having the inclined angle of groove is wider than the inclined angle of groove of the groove which is provided in the middle part is provided in the endmost part. Using the rolling rolls provided with the groove which is wider than the inclined angle of groove of the groove in the endmost part, the height of the stripe of the checkered steel plate is made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a striped steel sheet rolling roll for uniformly distributing the stripe height of a striped steel sheet and a method for rolling the same.

[0002]

2. Description of the Related Art A striped steel sheet supplied to a raw material for manufacturing a spiral steel pipe for construction and civil engineering needs a certain stripe height to ensure adhesion to earth, sand and concrete. . In the rolling of a striped steel sheet, when the steel sheet is rolled using a normal striped steel sheet rolling roll provided with a groove-shaped recess with a constant width, depth, and inclination angle, the strip height of the steel sheet is at an end in the width direction of the steel sheet. It showed a tendency to decrease toward the end, and it was not possible to obtain a striped steel plate having a constant stripe height. For this reason, various striped steel sheet rolling methods have been proposed in order to ensure that the striped steel sheet has a predetermined or higher stripe height.

[0003] In order to make the stripe height of the striped steel sheet higher than required, conventionally, a high pressure is applied to the steel sheet to be rolled so that the lowest stripe height part is equal to or more than the required stripe height. All the stripe heights of the striped steel plate have been set to a predetermined or higher stripe height. However, according to this method, the stripe height cannot be distributed uniformly, and the load stress applied to the roll to apply a high pressure reduction increases the roll surface roughness, shortening the life of the roll, etc. There was a problem.

As a method of uniformly distributing the stripe height of a steel sheet,
In JP-A-3-174904, by rolling using a striped steel sheet rolling roll having a crown shape such that the difference in the ratio crown of the rolled steel sheet on the inlet side and the outlet side before the final rolling stand of rolling is small, The stripe height of the striped steel plate is made uniform without changing the groove width and the like. In other words, this method measures or calculates the crown shape of the striped steel sheet before the final rolling stand, and the striped steel sheet with the same crown between the striped steel sheet crown and the ratio of the rolling striped steel sheet on the inlet side and the outlet side before the final rolling stand. Using a rolling roll, the stripe height of the striped steel plate rolled by the striped steel plate rolling roll of the final rolling stand was kept constant, and a striped steel plate having a uniform stripe height was made rollable. However, in this case, when the thickness of the striped steel sheet was changed, the crown shape changed and the striped steel sheet rolling roll had to be replaced.

Further, as a method of equalizing the stripe height of the striped steel sheet, in Japanese Utility Model Application Laid-Open No. 4-22102, the width of the groove (calibur) of the striped steel sheet rolling roll is changed from the center of the rolling roll to both ends of the rolling roll. The stripes were formed so as to become gradually larger, and the stripe height of the stripe steel plate was made uniform. This eliminates the need to change the crown of the grooved roll for each size of the striped steel sheet.

[0006] In the above conventional method, as described above, the stripe height distribution of the rolled striped steel sheet before the improvement is such that the stripe height has a peak height at the center of the steel sheet, and sequentially from the center of the striped steel sheet to both ends. It is assumed that a stripe height distribution curve becomes lower. However, according to the study of the present inventors, the stripe height distribution curve when rolled with a grooved roll having the same shape has a stripe height having a peak height at the center of the steel sheet, and a stripe height distribution curve having a peak height at the center of the steel sheet. And gradually increased near both ends of the striped steel sheet. Therefore, the above-described conventional method cannot control the stripe height distribution disclosed by the present invention. Furthermore, it is difficult to provide a striped steel sheet having a uniform strip height that can satisfy recent severe specifications by the conventional method.

[0007]

SUMMARY OF THE INVENTION The present invention provides a striped steel sheet having a predetermined stripe height with a uniform distribution of the stripe height over the entire striped steel sheet based on the stripe height distribution found by the present inventors. It is an object of the present invention to provide a striped steel sheet rolling roll and a striped steel sheet stripped steel sheet rolling method capable of obtaining a steel sheet.

[0008]

In the present invention, the object is to provide a grooved width of the groove provided in the central portion at each of the outermost, end, and central portions in the width direction of the striped steel sheet rolling roll. A groove having a groove upper width and a groove lower width that is wider than the groove lower width is provided at the extreme end, and the groove having a groove upper width and a groove lower width that is wider than the groove upper width and the groove lower width of the groove at the end is formed. This can be achieved by a striped steel sheet rolling roll for rolling a striped steel sheet provided at the end and having a uniform strip height. Further, the object is to form a groove having a groove inclination angle wider than a groove inclination angle of a groove provided at the center portion on each surface of an end portion, an end portion, and a center portion in a width direction of the striped steel sheet rolling roll. Department, and
A groove having a groove inclination angle wider than the groove inclination angle of the endmost groove can be achieved by a striped steel sheet rolling roll provided at the end.

The object of the present invention is to provide a grooved upper width and a lower width which are wider than the upper and lower widths of the groove provided at the central portion at the outermost, end and central surfaces in the width direction of the striped steel sheet rolling roll. A groove having a width is provided at the outermost end, and a groove having a groove upper width and a groove lower width that is wider than the upper and lower widths of the uppermost groove is provided at the end using a rolling roll. This can be achieved by a striped steel sheet rolling method in which the steel sheet is rolled to make the striped steel sheet have a uniform stripe height. Further, the object is to form a groove having a groove inclination angle wider than a groove inclination angle of a groove provided at the center portion on each surface of an end portion, an end portion, and a center portion in a width direction of the striped steel sheet rolling roll. The steel plate is rolled using a roll provided with a groove having a wider groove inclination angle than the groove inclination angle of the endmost groove at the end portion, and the stripe height of the striped steel plate is made uniform. It can be achieved by a striped steel sheet rolling method.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a cross section of a groove of a striped steel sheet rolling roll used in the present invention. In the figure, the groove 2 of the striped steel sheet rolling roll 1 has a groove upper width L, a groove lower width W, a groove depth H, and a groove inclination angle θ, chamfering c on both ends of the groove upper width, and A radius R is provided at both ends of the groove lower width.

First, the stripe height distribution of the striped steel sheet was determined using a striped steel sheet rolling roll in which grooves of a fixed shape were provided at fixed groove intervals. The groove provided on the roll has a groove width L of 12.2.
mm, groove width W is 6.604 mm, groove depth H is 6 mm,
The groove inclination angle θ was 65 °, a chamfer C of 1 mm was provided at both ends of the upper groove width, and a 2 mm radius R was provided at both ends of the lower groove width. Each groove interval is 36 mm, 42 grooves are present in the width direction of the rolling roll and provided along the circumferential direction, the total groove interval is 1476 mm, and the rolling roll width is 1650.
mm. FIG. 2 shows the stripe height distribution of a striped steel sheet rolled by a rolling roll provided with grooves of this shape.

The measured fringe height distribution curve is such that the fringe height is at the center of the steel plate (region of about 3/5 of the total fringe spacing: 26 grooves).
Or has a substantially constant height, or gradually decreases gradually from the center of the striped steel plate toward both ends, and after this region, the stripe height rapidly decreases, and the vicinity of both ends of the striped steel plate (from both ends) (Fourth groove only), tended to be the lowest, increased again toward the end of the striped steel plate, and had the highest groove at the end. The tendency that the height is increased again near both ends of the striped steel sheet and the groove at the end is highest is not pointed out in the prior art, but was confirmed by the inventors of the present invention in detail by continuous continuous measurement of the striped height. Further, FIG. 2B shows a thickness distribution of a thickness portion of the striped steel sheet. The thickness of the striped steel sheet was also thickest at the shortest part of the steel sheet, and the distribution tended to be similar to that of the stripe height.

In order to make the stripe height distribution and plate thickness distribution clarified in the present invention uniform, in the present invention, the groove shape of the striped steel sheet rolling roll is set to each of the striped steel sheet rolling rolls shown in FIG. Upper groove width L, lower groove width W, and groove depth H of the groove at the position
Is based on the stripe height distribution at each position of the striped steel sheet shown in FIG.
In order to improve the fluidity of the rolled steel sheet toward the width direction end of the rolling roll, each groove is placed above the groove within a range of about 19% of the width above and below the groove at the center of the rolling roll. The width and the width under the groove are made to correspond to each other, or separately from the outermost portion, the end portion, and the center portion. Further, the groove depth of the rolling roll was set to about twice the required stripe height.

The groove inclination angle θ of the rolling roll is shown in FIG.
In order to improve the flowability of the rolled steel sheet, the groove inclination angle in the center region is approximately 19% based on the groove inclination angle in the center region of the rolling roll based on the stripe height distribution shown in FIG. Increased. Since the groove inclination angle does not affect the fluidity of the steel when the distance between the respective groove centers is at least about three times the width above the groove, the groove inclination angle can be set to a constant angle. The groove at the outermost end of the rolling roll was wider than the groove in the central region of the rolling roll, and was narrower than the groove at the inner end of the outermost end.

[0015]

【Example】

Example 1 Striped steel plate thickness: 13.95 mm, stripe height: 3 mm, interval between grooves: 3
In order to obtain a striped steel sheet having a total groove spacing of 1476 mm with a total groove number of 6 mm and a total groove number of 42, the groove height of the rolling roll in the present invention is about twice the strip height of the steel sheet, ie, about 6 mm, and the groove height of the rolling roll is It was fixed. Since the groove center interval is about three times or more the upper width of the groove, the groove inclination angle does not affect the steel fluidity even if the groove inclination angle is constant. Therefore, the groove inclination angle is set to a constant angle. By setting the upper width and the lower width of each groove to the values shown below, a steel sheet having a desired stripe height could be obtained. That is, the upper width of the groove at each position in the width direction of the rolling roll was in the range of 12.2 to 14.5 mm, and the lower width of the groove was in the range of 6.604 to 7.904 mm. The shape of each groove of the embodiment used in the present invention is shown in FIG.
As shown in (a) to (c), the shape of the groove at the position A shown in FIG. 4 is 13.5 mm above the groove and 7.904 mm below the groove, and the shape of the groove at the position B is 14.5 mm above the groove. The groove bottom width is 8.904 mm, and the shape of the groove at the position C is the groove top width 12.
The width was 2 mm and the width under the groove was 6.604 mm. A 1 mm chamfer c was applied to both ends of the upper portion of the groove, and a round portion R of 2 mm was provided at both ends of the lower portion of the groove. The groove inclination angles of the grooves at the positions A, B, and C were 65 °.

More specifically, based on the stripe height distribution shown in FIG.
Since the stripe heights of the books are almost uniformly distributed, it indicates that the rolled steel sheet material flows uniformly during rolling. Therefore,
Since the rolling reduction of the rolling roll is sufficiently applied to the rolled steel sheet material to obtain a predetermined stripe height, the 34 grooves in the central region are left as shown in FIG. 3 (c) under the same groove conditions as when the distribution of
At the position C. The groove at the position C has the narrowest upper groove width of about 12.2 mm and the lower groove width of about 6.604 mm. Next, in the inner region near the end region of the striped steel sheet, that is, in the second to fourth grooves, the predetermined stripe height is most difficult to obtain, so that it is necessary to widen the groove width to maximize the fluidity of the steel sheet material. Was. For this reason, the grooves in the inner region from the end of the rolling roll to the second to fourth rolls are located at the position B in FIG.
Groove. The width above the groove was about 14.5 mm and the width below the groove was about 8.904 mm, which was about 19% larger than the groove at the position C. Further, in the stripe height distribution of FIG. 2A, the stripe height of one groove at the end of the steel plate is higher than the groove in the inner region and the central region. However, according to the results of the rolling experiment, one groove at the end of the rolling roll was the groove at the position A in FIG.
This groove is wider than the position C in the central region of the rolling roll, and has a groove upper width of about 13.5 mm and a groove lower width of about 7.904 mm.
The groove at the position was increased by about 11% and made narrower than the groove at the position B. FIG. 4 shows the arrangement of 42 grooves of the striped steel sheet rolling roll having the above configuration.

FIGS. 5A and 5B show the stripe height distribution and the plate thickness distribution of the striped steel sheet rolled by the striped steel sheet rolling roll having the above configuration. FIG. 2 measured according to the invention
Based on the stripe height distribution curve of (a), by changing the upper and lower widths of the grooves provided at the outermost end, the end and the center of the rolling roll, the uniformity over the entire striped steel sheet is obtained. The stripe height could be obtained, and the stripe height could be evenly distributed at both ends of the striped steel plate. Example 2 Striped steel plate thickness: 13.95 mm, stripe height: 3 mm, interval between grooves: 3
In order to obtain a striped steel sheet having a total groove interval of 1500 mm with a total groove number of 0 mm and a total of 50 grooves, the groove width and the groove height of each groove were determined in Example 1.
And the same. Since the groove center interval becomes about 2.6 times less than about 3 times the groove width, the groove inclination angle affects the steel fluidity. Therefore, the groove inclination angle is about 1 with respect to the center groove of the rolling roll.
9%, the groove inclination angle of each groove of the rolling roll is 65
It varied within the range of 〜59 °.

More specifically, referring to the stripe height distribution in FIG. 2A, 38 grooves in the central region are left in the central region except for seven grooves from both ends of the rolling roll. The groove condition was the same as when the stripe height distribution was obtained, that is, the groove at the position F in FIG. The groove at the position F has the narrowest groove width of about 12.2.
mm, the under-groove width was about 6.604 mm, and the groove inclination angle was 65 °. Next, the inner region near the end region of the striped steel plate, that is, the third to sixth grooves are shown in FIG.
At the position E. The width of the groove at the position E is about 1
At 4.5 mm, the under-groove width was about 7.232 mm, and the groove inclination angle was 58.8 °, which was 19% larger than the groove upper width and the groove inclination angle of the groove at the position F. Further, the two grooves at the end of the rolling roll were set to the grooves at the position D in FIG. The groove at the position D is wider than the central region of the rolling roll and has a groove upper width of about 13.5 mm, a groove lower width of about 6.985 mm, a groove inclination angle of 61.5 °, and a position F. The groove upper width and the groove inclination angle of the groove No. 11 were increased by 11%, and were made narrower than the groove at the position E. FIG. 7 shows an arrangement of 50 grooves of the striped steel sheet rolling roll having the above-described configuration.

FIGS. 8 (a) and 8 (b) show the stripe height distribution and the plate thickness distribution of the striped steel sheet rolled by the striped steel sheet rolling roll having the above configuration. By changing the upper groove width, lower groove width, and groove inclination angle of each groove according to the stripe height distribution curve, even though the distance between the groove centers is narrowed, a more uniform stripe height over the entire striped steel plate is achieved. As a result, the stripe height could be evenly distributed at both ends of the striped steel plate.

[0020]

According to the present invention, the upper groove width, the lower groove width, and the groove inclination angle of the groove shape of the striped roll are changed according to the position in the width direction of the striped steel sheet rolling roll or according to the position from the end of the striped steel sheet. With this, it is possible to provide a material with a uniform height of the striped steel plate,
The product quality of the spiral steel pipe as a secondary product could be maintained at a certain level or higher. Further, since it is not necessary to apply a high pressure reduction to the steel sheet, the rolling conditions are constant, the surface of the roll does not become rough, and the roll life can be extended.

[Brief description of the drawings]

FIG. 1 shows a cross-sectional shape of a groove of a striped steel sheet rolling roll used in the present invention.

FIG. 2 (a) shows the stripe height distribution of a striped steel sheet rolled by a conventional striped steel sheet roll having 42 grooves, and FIG. 2 (b) shows the thickness distribution of the stripped steel sheet in the thickness portion.

FIG. 3 shows the shape of a groove used in the present invention, and FIG.
(B) shows a groove of B, and (c) shows a groove of C.

FIG. 4 shows an arrangement diagram of 42 grooves of each shape provided on a striped steel sheet rolling roll according to the present invention.

FIG. 5 (a) shows a stripe height distribution of a striped steel sheet rolled by a striped steel sheet rolling roll having 42 grooves according to the present invention, and FIG. 5 (b) shows a sheet thickness distribution.

FIG. 6 shows the shape of the groove used in the present invention, and FIG.
(B) shows an E groove, and (c) shows an F groove.

FIG. 7 shows an arrangement view of 50 grooves of each shape provided on a striped steel sheet rolling roll according to the present invention.

FIG. 8 (a) shows the stripe height distribution of a striped steel sheet rolled by a striped steel sheet rolling roll having 50 grooves according to the present invention, and FIG. 8 (b) shows the sheet thickness distribution.

[Explanation of symbols]

 1: Rolling roll 2: Groove H: Groove height L: Groove upper width W: Groove lower width c: Chamfered part R: Round part θ: Groove inclination angle X: Total groove interval Y: Rolling roll width

Claims (4)

[Claims] 1. A groove upper width and a groove lower width which are wider than a groove upper width and a groove lower width of a groove provided at the central portion at each surface of an endmost portion, an end portion and a central portion in the width direction of the striped steel sheet rolling roll. A groove having a groove upper width and a groove lower width larger than the groove upper width and the groove lower width of the endmost groove is provided at the end portion. A striped steel sheet roll that rolls striped steel sheet with uniformity. 2. A groove having a groove inclination angle wider than a groove inclination angle of a groove provided at the central portion on each surface of an end portion, an end portion, and a central portion in a width direction of the striped steel sheet rolling roll. The rolled striped steel sheet roll according to claim 1, wherein a groove provided at the end portion and having a groove inclination angle wider than the groove inclination angle of the endmost groove is provided at the end portion. 3. A groove upper width and a groove lower width which are wider than the groove upper width and the groove lower width of the groove provided at the central portion at each of the outermost end, the end and the central portion in the width direction of the striped steel sheet rolling roll. Using a rolling roll provided at the end with a groove having an upper groove width and a lower groove width larger than the upper groove width and the lower groove width of the groove at the outermost end. Rolling a striped steel sheet to make the striped steel strips uniform in height. 4. A groove having a groove inclination angle wider than a groove inclination angle of a groove provided at the central portion on each surface of an endmost portion, an end portion, and a central portion in a width direction of the striped steel sheet rolling roll. The steel plate is rolled using a roll provided with a groove having a wider groove inclination angle than the groove inclination angle of the endmost groove at the end portion, and the stripe height of the striped steel plate is made uniform. 4. The method according to claim 3, wherein: