JP2002035835A - Tension leveler correcting sheet strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension leveler correcting a sheet strip having a small required plane space. SOLUTION: In the tension leveler having a guide roller 2 at an inlet side of a strip 1, and guide rollers 3 and 4 are also arranged at an outlet side of a strip, and a main roller 5 between the guide rollers 2 and 3, and also strongly pushing the main roller 5 upward against the lower side of the strip, the aforementioned main roller 5 is formed to be a drum shape in which a roller diameter D is gradually reduced from the center to both the ends in a width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension leveler for correcting deformation of a thin steel strip which is an intermediate material for producing spring materials and other various steel sheets.

[0002]

2. Description of the Related Art A thin steel strip, such as a high-hardness stainless steel strip, which is an intermediate material of various steel sheets, is deformed in a rolling process by a so-called "wakame" extending from both edges toward the center of the steel strip (see FIG. 1). 5), and the predetermined width portions on both sides of the steel strip where the wavy deformation portion exists cannot be used as a steel sheet product.

Therefore, a leveler is used as a device for reducing the deformation range and the deformation amount of the wavy deformed portion by correction so as to reduce the nonstandard portion of the steel strip as much as possible. Conventionally, this leveler is composed of a number of rollers arranged vertically, and the steel strip is pressed alternately from above and below by pressing the steel strip between the upper and lower rollers in the horizontal direction. It is given repeatedly to the belt.

[0004]

However, the above-mentioned conventional leveler requires a large space in which a large number of rollers are arranged in a plane.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tension leveler which requires a small planar space.

[0006]

To achieve the above object, a first tension leveler according to the present invention comprises a pair of upper and lower pairs of inlet guide rollers at the inlet side of a steel strip and a pair of upper and lower outlet rollers at the outlet side. A side guide roller and a pair of upper and lower drive rollers are sequentially provided, and a main roller that moves up and down by hydraulic pressure or the like is provided between the entrance side guide roller and the exit side guide roller. In the tension leveler for correcting a thin steel strip, the main roller 5 is formed in a drum shape in which the roller diameter D gradually decreases from the center 10 in the width direction of the roller toward both ends 11. The second tension leveler of the present invention is the same as the first tension leveler, wherein the left half and the right half of the roller surface in the roller width direction on the roller surface of the main roller 5 have a center 10 in the roller width direction as a starting end, and both left and right ends 11. Are formed in such a manner that spiral directions of the grooves 12 are respectively terminated at the left and right sides.

[0007]

With the tension leveler constructed as described above, the main roller is strongly pressed against the steel strip from underneath, and the steel strip is applied from the inlet side to the exit side by the driving roller while a large tension is applied to the steel strip. When transported toward the side, each part of the steel strip is subjected to a strong bending force of the main roller under a large tension, and a large tensile stress is generated in the inside of the steel strip where the wavy deformation is not generated, which is called "wakame", and the material is deformed. Elongation deformation occurs, and as a result, the “wakame” wave is flattened. At this time, the drum-shaped main roller contributes specifically to the above operation. "Wakame", as described above, is a wavy deformation that extends from both edges of the steel strip toward the center of the steel strip, with both sides of the steel strip being stretched more than the inside. This is distortion during rolling. When the thin steel strip passes through the main roller, the inner part of the steel strip receives great tension at the drum-shaped large-diameter part of the main roller, and both sides of the steel strip receive little tension. In this case, not only is there a difference in tension, but also the tension on both sides of the steel strip is given only when the inner part of the steel strip is stretched by an amount corresponding to the drum-shaped bulge of the main roller, so that the main roller is pushed up. As long as the force is sufficient, it is ensured that the inner part of the strip is always stretched by a certain length more than the two sides of the strip. Therefore, "wakame" formed on both sides of the steel strip
Is straightened and the strip becomes generally flat. Furthermore, the spiral groove of the main roller ensures the above correction of "wakame". The edge of the groove grips the steel strip firmly, and the groove that moves apparently from the center of the main roller to the outside due to the rotation of the main roller applies a force acting to spread the steel strip from the center to both sides. Is further stretched.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. In FIG. 1, upper and lower pairs of guide rollers 2 and 3 are provided on the inlet side and the outlet side of the steel strip 1. These guide rollers are freely rotating, and are provided at fixed positions on the inlet side and the outlet side. Exit side guide roller 3
In the subsequent stage, a pair of upper and lower drive rollers 4 is provided. A main roller 5 is provided between the entrance side guide roller 2 and the exit side guide roller 3. The main roller 5 may be a free-running roller itself, or may be a driving-type roller synchronized with the transfer speed of the steel strip. The main roller 5 is attached to a jack driven by hydraulic pressure or the like so as to be vertically movable. If the jack is installed on a low floor dug into the yard and is arranged so that the level range of the guide rollers 2 and 3 is included in the stroke range of the main roller 5, the first time the steel strip 1 is set on the leveler, By lowering the steel strip 1 below the level of the guide rollers 2 and 3, the steel strip 1 can be set on the main roller 5 by a simple operation of pushing the tip of the steel strip 1 horizontally.

After the steel strip 1 is set on the main roller 5, the steel strip 1 is gripped by the driving roller 4, and the main roller 5 is raised upward while being pressed upward from the lower surface against the steel strip 1, and tension is applied to the steel strip 1. Multiply. When the main roller 5 rises to a predetermined height, the main roller 5 is transported while applying the required tension to the steel strip 1 by the driving roller 4 while maintaining the height or adjusting the height as necessary. The adjustment of the tension of the steel strip is also adjusted by the axial force of a steel strip feeding device such as a raw coil 7 at the preceding stage of the leveler.

FIG. 2 shows an example of a line on which the tension leveler 6 of the present invention is arranged. Reference numeral 7 denotes a raw coil as a device for feeding a steel strip to the leveler 6, reference numeral 8 denotes a meshing type finishing leveler, and reference numeral 9 denotes a finishing leveler. Is a cutting machine for cutting the steel strip 1 into a steel sheet having an appropriate size and shape.

FIG. 3 shows the main roller 5 in the tension leveler 6 of the present invention. The main roller 5 is
The roller diameter D is formed in a drum shape that gradually decreases from the center 10 in the roller width direction to both sides 11. The ridges along the roller width direction of the main roller 5 form a gentle convex curve having a continuous curvature. The radius of curvature R of the convex curve may be a constant length or may be a substantially constant length. In the former case, the convex curve is a circular arc, and as an example of the convex curve in the latter case, a parabola can be used. In any case, when the roller width is 2 m, R is about 9.
6 m, the height of one side bulge at the center can be about 52 mm.

In FIG. 4, a spiral groove 12 having a center 10 in the width direction of the roller as a starting end and left and right ends 11 as ends thereof is provided in the left half and the right half of the roller surface of the main roller 5 in the width direction of the roller. Indicate that the left and right sides are engraved in opposite directions. The main roller 5 is set such that the groove 12 apparently moves from the center 10 in the roller width direction to both ends 11 in the rotation direction during the operation. The depth of the groove 12 is preferably about 5 mm. The steel strip is given a force to be stretched outward in the circumferential direction and the width direction of the main roller 5 in a gripped state by the edge of the groove (a depression from the roller surface to the groove). The chevron at the edge of the groove exerts a force that grips the steel strip (so-called "kills") and moves it outward. However, if the chevron is too acute, it marks the steel strip. Size and protect the steel strip.

[0013]

Since the present invention is constructed as described above, it can be installed within a relatively short range in the transfer direction as compared with a conventional leveler in which a number of rollers are arranged in the transfer direction of the steel strip. In addition, the length of one line including the tension leveler can be shortened, and the drum shape of the main roller and the spiral groove on the roller surface remain on both sides of the thin steel strip, commonly called "Wakame". Can be efficiently corrected.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a tension leveler of the present invention.

FIG. 2 is a front view showing an example of a line on which a tension leveler of the present invention is arranged.

FIG. 3 is a front view showing a drum-shaped shape of a main roller.

FIG. 4 is a front view showing a spiral groove on the surface of the main roller.

FIG. 5 is a plan view showing “wakame” which is a strain remaining in a thin steel strip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel strip 2 Inlet side guide roller 3 Outlet side guide roller 4 Drive roller 5 Main roller 6 Tension leveler 7 Raw coil 8 Finishing leveler 9 Cutting machine 10 Roller width direction center 11 Left end, right end 12 Groove 13 Wakame D Roller diameter R Roller Curvature radius of width direction ridge

Claims (2)

[Claims] 1. A pair of upper and lower pairs of inlet guide rollers (2) are provided at the inlet side of the steel strip (1), and a pair of upper and lower pairs of outlet guide rollers (3) and a pair of upper and lower drive rollers (4) are provided at the outlet side. A main roller (5) that moves up and down by hydraulic pressure or the like is provided between the inlet side guide roller (2) and the outlet side guide roller (3), and the main roller (5) is connected to the steel strip (1). In the tension leveler for straightening a thin steel strip which is strongly pressed from below, the main roller (5) has a roller diameter (D) extending from the center (10) in the roller width direction to both ends (11). Tension leveler for straightening of thin steel strip formed in drum shape that gradually decreases 2. A spiral shape having a left half and a right half in the roller width direction on the roller surface of the main roller (5) starting at a center (10) in the roller width direction and ending at both left and right ends (11). The tension leveler for correcting a thin steel strip according to claim 1, wherein the grooves (12) are formed so that the turning directions thereof are opposite to each other on both right and left sides.