JP3314955B2 - Roller leveler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller leveler used for correcting a surface shape of a steel strip after a rolling process.

[0002]

2. Description of the Related Art A roller leveler basically comprises a plurality of upper work rolls and a plurality of lower work rolls, which are alternately arranged up and down and which define a pass line through which a rolled steel strip passes. And two pairs of pinch rollers disposed before and after the pass line so as to feed the belt through the pass line. The steel strip passing through the pass line,
Bent along the cylindrical surface of the individual upper and lower work rolls,
Thereby, it is stretched to the plastic region, and as a result, the strain on the surface of the steel strip is removed. That is, the surface shape of the steel strip is corrected.

[0003] The thickness of the belt that can be processed by the roller leveler depends on the diameter of the work roll, or the distance between the upper work rolls and the distance between the lower work rolls (pitch). Determined by size. If the range of the thickness of the strip that can be processed is wide, the straightening of the strip that has been performed using a plurality of roller levelers can be performed by a single roller leveler. Conventionally, a pair of upper and lower work rolls adjacent to each other in a diagonal direction are movable upward and downward with respect to another pair of upper and lower work rolls adjacent to the pair of upper and lower work rolls, and There has been proposed a roller leveler capable of moving a lower work roll group in a lateral direction perpendicular to the axis thereof (see Japanese Patent Application Laid-Open No. 62-203616).

[0004]

According to this roller leveler, after moving the pair of upper and lower work rolls in the oblique direction upward and downward, respectively, the moved upper work roll and lower work roll are respectively moved to the other work rolls. The lower work roll group is moved laterally so as to face the stationary lower work roll and upper work roll. As a result, both upper and lower work roll groups having twice the pitch as compared to before the movement are newly formed. Work rolls arranged at a larger pitch can correct the shape of a strip having a larger thickness when applying the same pressing force to the strip as compared to work rolls arranged at a smaller pitch. enable.

Incidentally, a plurality of upper and lower work rolls defining a pass line must be accurately arranged and maintained. This is essential for sheet straightening. However, in the conventional roller leveler, during use, abrasion, rust, dust, and the like generated in a laterally movable supporting means for supporting the lower work roll group and other portions of the roller leveler are caused by the lower work. The possibility of compromising the correct alignment of the roll groups is great, and therefore making the lower work roll groups laterally movable is undesirable in maintaining a high precision roller leveler. An object of the present invention is to provide a roller leveler capable of increasing the pitch of a work roll group that defines a pass line of a steel strip without allowing the lower work roll group to move in a lateral direction.

[0006]

SUMMARY OF THE INVENTION A roller leveler according to the present invention includes a plurality of upper work rolls and a plurality of lower work rolls, which are staggered up and down, defining a pass line for a strip to be straightened. Wa on a portion of the plurality of upper work rolls Ri all lowerable der of possible and and said plurality of lower work rolls down every other, which is lowered
Between the crawl and the non-descending upper work roll
A new pass line is defined . Alternatively, to allow increased every other plurality of upper work rolls is raised
Work rolls on some raised and non-raised rests on the top
A new pass line between the
Alternatively, the lower work rolls can be lowered every other one of the lower work rolls, and a part of the lower work rolls that have been lowered and
A new pass line between the lower work roll
It can be a shall.

[0007]

According to the present invention, a plurality of upper work rolls are alternately arranged, that is, the odd or even upper work rolls are lowered, and all the lower work rolls are lowered. A new pass line can be formed by the lower upper work roll and the lower upper work roll. In addition, the center distance (pitch) between the upper work rolls in a part of the descending state that defines the new pass line and the center distance (pitch) between the remaining upper work rolls in the non-descent state before the descent are respectively determined. It is twice the pitch of the upper work roll. Therefore, according to this, it is possible to correct the shape of the strip having a thickness dimension exceeding the maximum thickness of the strip that can be corrected by the upper and lower work roll groups before the lowering. Further, the lowering of the upper work roll and the lowering of the lower work roll do not involve a lateral movement, and therefore the arrangement relation of the upper work roll and the lower work roll in the horizontal direction is strictly defined. It is maintained, and even after long-term use. Therefore, according to the present invention, precise shape correction can be performed for any of thin to thick plates.

[0008] By raising the plurality of upper work rolls alternately or lowering the plurality of lower work rolls alternately, the raised upper work rolls and the non-raised rest are also raised. A new pass line can be formed by the upper work roll or by a part of the lower work roll that has been lowered and the lower work roll that has not been lowered. Also at this time, the pitch between some of the raised or lowered work rolls and the pitch between the remaining non-raised or non-lowered work rolls are twice the pitch in the original state, respectively. It is possible to correct the shape of strips with large dimensions. In these examples, the new pass line is formed at a position above or below the original pass line. For this reason, the inclination angle of the strap reaching the new pass line via a pair of upper and lower pinch rolls provided on the entrance side of the pass line to apply a feeding force to the strap is increased. As a result, the belt is plastically deformed by receiving large bending and tensile forces from both the pinch rolls and the work rolls defining the entrance of the pass line. Thereby, the straightening effect of the steel strip is enhanced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a roller leveler generally denoted by 10 is used to correct a linear or dot-like distortion at the center or side in the width direction of a rolled strip. Have been.

The roller leveler 10 includes a plurality of upper work rolls 14 and a plurality of lower work rolls 16, which are arranged in a zigzag or staggered manner and define a pass line of a strip 12 to be straightened, and a belt 12. A pair of upper and lower pinch rolls 18 (not shown) disposed on the entrance side of the pass line and a pair of upper and lower pinch rolls disposed on the exit side are provided to apply a feeding force to the path line.

The upper work rolls 14 and the lower work rolls 16 are arranged horizontally with a pitch L, and all upper work rolls (upper work rolls) 14 and all lower work rolls (lower work rolls) 16 are arranged.
Can be moved simultaneously in the vertical direction. When the belt 12 is passed between the upper and lower work rolls 14, 16, the lower work roll 16 is maintained immovable, and the upper work roll 14 exerts a pressing force required for correction on the belt 12. . While passing between the two work roll groups 14, 16, the steel strip 12 is repeatedly bent and subjected to a tensile force along a part of the peripheral surface of each of the upper and lower work rolls, thereby being given plastic elongation, Surface distortion is eliminated. That is,
The surface shape is corrected.

The plurality of upper work rolls 14 can be further lowered every other one. That is, the upper work roll of the odd-numbered or even-numbered part can be lowered with respect to the other upper work rolls. As shown in FIG. 2, when the lower work roll group 16 is lowered and the upper work roll is partially lowered,
A new pass line is formed by the non-descent upper work roll 14. At this time, the pitch between the lowered upper work rolls 14A and the non-descent upper work rolls 14A
The mutual pitch is 2L, which is twice the original pitch L, respectively.
Becomes

The upper work roll 14A having an enlarged pitch
And the upper work roll 14 applies a larger bending and a larger tensile force to the steel strip under the same rolling force as compared with the upper work roll 14 before the pitch is enlarged. Therefore, the thickness of the steel strip capable of giving the bending and elongation to the extent that the strain of the steel strip can be eliminated under the maximum rolling force is larger before the expansion (FIG. 2) than after the pitch expansion (FIG. 2). Fig. 1) Larger. This means that a single roller leveler can perform shape correction of a belt having a wider range of thickness dimensions. For example, when the diameter of each of the work rolls 14 and 16 is 50 mm and the pitch L is 53 to 55 mm, the range of the thickness dimension of the strip 18 that can be corrected by the roller leveler 10 in the state shown in FIG. 0.5 mm to 3.2 mm. On the other hand, in the roller leveler in the state shown in FIG. 2 in which the pitch L is doubled, the belt 2 having a thickness in the range of 2.0 mm to 6.0 mm is used.
A correction of 0 is possible. Therefore, the roller leveler 10 in the illustrated example can substantially correct a belt having a thickness in the range of 0.5 mm to 6.0 mm. The lower work roll group 16 that has been lowered is the upper work roll 1 that has been lowered.
4A, and acts as a backup roll for preventing the work roll from bending.

As shown in FIGS. 3 and 4, a plurality of upper work rolls 14 can be set alternately, that is, even or odd upper work rolls 14 can be raised. At this time, the upper work roll group 14
Is set to be movable in the vertical direction in order to apply the rolling force. However, the lower work roll group 16 is not necessary.

When a part of the upper work rolls is raised, the raised upper work rolls 14B and the other non-raised upper work rolls 14 form a new pass line. Also at this time, the pitch between the ascending upper work rolls 14B and the non-ascending upper work rolls 14 is 2L, which is twice the pitch L before the ascending. Therefore, according to this example, similarly to the examples shown in FIGS. 1 and 2, the thin belt 12 and the thick belt 20 can be selectively corrected by one roller leveler. In this example, the lower work roll group 16 acts as a backup roll for the non-elevated upper work roll 14.

Also, in the example shown in FIGS. 1 and 2, the original pass line for the thin strap 12 and the new pass line for the thick strap 20 were at the same height position, ie, at the same level. However, in the examples shown in FIGS. 3 and 4, the new pass line is set at a position higher than the original pass line. For this reason, the inclination angle of the strap 20 between the pair of pinch rolls 18 and the upper work roll 14 or 14B adjacent to the pinch rolls 18 is larger than that in the example shown in FIG. From this, as the tie 20 passes through the upper work roll adjacent to the pinch roll 18, it is subjected to greater bending and tensile forces, and thus the tie 2
A value of 0 is given greater plastic elongation, resulting in a greater corrective effect. Further, when raising the upper work roll every other, unlike the example shown in FIGS. 1 and 2,
Since the lower work roll group 16 does not need to be moved,
A roller leveler having a simpler structure than the examples shown in FIGS. 1 and 2 can be obtained.

According to the examples shown in FIGS. 5 and 6, a large level difference can be generated between the new pass line and the original pass line. In this example, contrary to the examples shown in FIGS. 3 and 4, a plurality of lower work rolls 16 can be lowered every other. The upper work roll group 14 includes the thin band 12
Can be moved up and down for the correction of

According to this example, when a part of the lower work rolls is lowered, the lowered plurality of lower work rolls 16A and the other plurality of non-descent lower work rolls 16 form a new pass line. The pitch between the lower work rolls 16A descending and the upper work rolls 16 not descending is 2L as in the above-described example, so that the thick and thin belts 12, 20 can be selectively corrected. In addition, the new pass line is located below the original pass line, and a large plastic elongation can be imparted to the belt 20 as in the above-described example.
Further, in this example, the upper work roll group 14 performs a backup function for the non-descent lower work roll 16.
Also in this example, as in the examples shown in FIGS. 3 and 4, when lowering the plurality of lower work rolls 16 alternately, the upward movement of the upper work roll group 14 is not required.

In any of the above-described examples, the ascending distance or descending distance of the work roll which is raised or lowered every other is determined according to the thickness of the belt 20.

[Brief description of the drawings]

FIG. 1 is a side view of a roller leveler in which a thin band is passed between upper and lower work rolls.

FIG. 2 is a side view of the roller leveler shown in FIG. 1 with a thick band passed between a lowered upper work roll and a non-lowered upper work roll.

FIG. 3 is a side view of another example of a roller leveler in which a thin band is passed between upper and lower work rolls.

FIG. 4 is a side view of the roller leveler shown in FIG. 3 with a thick band passed between a raised upper work roll and a non-raised upper work roll.

FIG. 5 is a side view of another roller leveler in which a thin band is passed between upper and lower work rolls.

6 is a side view of the roller leveler shown in FIG. 5 with a thick band passed between a lowered lower work roll and a non-lowered lower work roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Roller leveler 12 Thin belt 14 Upper work roll 16 Lower work roll 18 Pinch roll 20 Thick belt

Claims (3)

(57) [Claims] 1. A method comprising: a plurality of upper work rolls and a plurality of lower work rolls, which are alternately arranged up and down, defining a pass line of a steel strip to be straightened; possible and and Ri all lowerable der of the plurality of lower work rolls, a part which is lowered
Between the upper work roll and the non-descent rest upper work roll
Roller leveler with a new pass line defined between them . 2. A method comprising a plurality of upper work rolls and a plurality of lower work rolls, which are alternately arranged one above the other, defining a pass line of the steel strip to be straightened, wherein the plurality of upper work rolls rise alternately. possible der is, part of which has been raised
With the upper work roll and the non-rising rest upper work roll
Roller leveler with a new pass line defined between them . 3. A plurality of upper work rolls and a plurality of lower work rolls, which are alternately arranged up and down, defining a pass line of a strip to be straightened, wherein the plurality of lower work rolls are alternately lowered. possible der is, part of which has been lowered
Between the lower work roll and the lower lower work roll
Roller leveler with a new pass line defined between them .