JP2000233222A - Tension leveler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension leveler capable of straightening ultrahard stainless steel having proof stress of >=130 kgf/mm2 which is impossible heretofore. SOLUTION: This leveler consists of elongating roll units and a multi roll unit succeeding the units, the elongating roll units are provided with a 1st elongating roll unit and 2nd elongating roll unit. All of respective elongating roll units consist of the work roll 11 of a straight roll, intermediate roll 14 at one end of which a tapered part is formed and back-up rolls 13 for supporting each intermediate roll 14. The intermediate roll 14 of the 1st elongating roll unit and intermediate roll 14 of the 2nd elongating roll unit are arranged reversing the tapered parts 14b to each other and both intermediate rolls 14 are freely movable forward and backward in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a tension leveler. More specifically, the present invention relates to a tension leveler suitable for straightening extremely hard steel plates having a proof strength of 130 kgf / mm ² or more. In this specification, the proof stress is defined as "a value obtained by dividing a load at which a permanent elongation of 0.2% occurs in a tensile test by a cross section of a parallel portion" specified in JIS.

[0002]

^2. Description of the Related Art There are various types and mechanical properties of steel sheets, and those suitable for each application are produced. However, in terms of proof stress, up to now, 130 kgf / mm ² or less. Was present, but only a small amount of those with higher yield strength was present. However, currently the proof stress is 13
Extremely hard steel sheets of 0 kgf / mm ² or more are about to be mass-produced.

[0003] By the way, a leveler for straightening a thin steel sheet is:
Developed from a roller leveler and applied a tension to the plate material enough to follow the work roll, and developed in the direction of increasing the tension to increase the effect of shape correction, and developed as an alternative to the stretcher leveler And others. In any case, these conventional tension levelers have been used for straightening thin steel sheets having a proof strength of 130 kgf / mm ² or less, and have achieved a certain straightening effect, but have a proof strength of 130 kgf / mm 2. As a result of intensive experiments and studies by the inventors, it has been confirmed that it is impossible to simultaneously achieve flatness and elimination of residual warpage for ^two or more thin steel plates.

[0004] Incidentally, yield strength of a conventional tension leveler for the following steel sheet 130 kgf / mm ^2, as a tension leveler having a structure in which most approximate to the present invention, JP 55
And Japanese Patent Publication No. 57-37405. In each of these conventional examples, a taper roll having tapered portions formed at both ends is used as a work roll. According to this conventional example, since the end of the strip S abuts on the tapered portion, the extension of the side end of the strip S is shorter than the extension of the central portion, thereby suppressing generation of ear waves which cannot be prevented by a normal straight roll. Can be.

[0005]

However, in the above-mentioned conventional example, the strip is strongly bent at the taper start point of the work roll (the edge of the boundary between the tapered portion and the straight portion), and the stripes are streaked on the surface of the strip. there were. In addition, since the straightening condition is greatly different between the straight portion and the tapered portion of the work roll, there is a problem that the straightened strip tends to exhibit uneven stress distribution in the width direction. Further, even in the conventional example, as described above, although the steel material having a low hardness has a straightening effect, the proof stress is low.
No straightening could be performed on extremely hard steel plates of 130 kgf / mm ² or more. Therefore, currently, extremely hard steel sheets having a proof strength of 130 kgf / mm ² or more are used without straightening because of the small production volume. However, no matter how hard the steel plate is, the edge of the ear is easily stretched, and it is of course difficult to use the steel plate with the elongated ear.

[0006] In view of such circumstances, an object of the present invention is to provide a tension leveler capable of correcting an extremely hard steel plate having a proof stress of 130 kgf / mm ² or more, which was impossible in the past.

[0007]

The tension leveler according to the present invention comprises an extension roll unit and a multi-roll unit following the extension roll unit. The extension roll unit has a straight roll work roll and two ends supporting the work roll. It is characterized by comprising an intermediate roll having a tapered portion and a backup roll supporting the intermediate roll. The tension leveler of claim 2 comprises an extension roll unit followed by a multi-roll unit, said extension roll unit comprising a first extension roll unit and a second extension roll unit, wherein said first and second extension roll units. All, a work roll of a straight roll and an intermediate roll having a tapered portion at one end,
It consists of a backup roll that supports each intermediate roll,
The intermediate roll of the first extension roll unit and the intermediate roll of the second extension roll unit are disposed with their tapered portions opposite to each other, and the two tapered rolls can move forward and backward in the axial direction. I do. The tension leveler according to claim 3 is the invention according to claim 1 or 2, wherein each of the stretching roll units has a reduction amount adjusting device,
It is characterized by being provided separately.

According to the first aspect of the present invention, the load during the straightening operation causes the work roll of the straight roll to fit into the intermediate roll having the tapered portion, and both ends of the work roll are gently bent. For this reason, at both ends in the width direction of the strip, the pressure can be released and the ear end can be prevented from being extended too much, so that an ear wave does not occur. And since a work roll adapts to an intermediate roll and bends, since an edge is not formed in a roll, a stripe does not adhere to a strip. In addition, since the correction condition only changes slowly and there is no significant change,
The stress distribution in the strip is also not very uneven. According to the second aspect of the present invention, the intermediate roll can be moved in the axial direction to correspond to any width of the strip, and optimal leveling can always be performed. According to the third aspect of the present invention, the reduction amount of the work roll is individually adjusted to release the reduction so as not to extend the ear end too much, and the ear expansion is suppressed particularly when the edge expansion state of both edges of the plate is different. It is possible to straighten extremely hard steel plates with a proof strength of 130 kgf / mm ² or more.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an extension roll unit of a tension leveler according to one embodiment of the present invention, and FIG. 2 is a side view of the tension leveler according to one embodiment of the present invention.

In FIG. 2, 1 is a first extension roll unit, 2 is a second extension roll unit, 3 is a deflector roll, and 4 is a multi-roll unit. S is a strip and runs in the order described above. In the present invention, the proof stress
Ultra-hard stainless steel plates of 130 kgf / mm ² or more are targeted, but other strips S can be straightened.

The first extension roll unit 1 comprises an upper roll unit 6 and a lower roll unit 7 arranged so as to sandwich the strip S. Each of the roll units 6 and 7 is a straight roll work roll 11. And intermediate roll 12 of a straight roll and its intermediate roll 1
2 and a backup roll 13 for supporting the same. The second stretching roll unit 2 also includes an upper roll unit 6 and a lower roll unit 8 arranged so as to sandwich the strip. However, the upper roll unit 6 has the same configuration as the first extension roll unit 2, but the lower roll unit 8 is different in that an intermediate roll 14 of a taper roll is used. That is, the lower roll unit 8 includes a work roll 11 of a straight roll, an intermediate roll 14 of a tapered roll, and a backup roll 13 supporting the intermediate roll 14. Details of the lower roll unit 8 will be described later.

Reference numeral 15 denotes a reduction device provided in each of the extension roll units 1 and 2. The multi-roll unit 4 is not particularly different from a known one, and a plurality of straight rolls 21 and 22 are arranged in a staggered manner so as to sandwich the strip S. Reference numeral 23 is a known amount of reduction device provided in the multi-roll unit 4.

Next, details of the lower roll unit 8 will be described with reference to FIG. The intermediate roll 14 is a roll in which a straight portion 14a at the center and a tapered portion 14b whose diameter decreases toward the tip at both ends are formed.
The backup roll 13 is composed of a plurality of rolls having a short axial length, and is arranged so as to uniformly support the entire length of the intermediate roll 14. The work roll 11 is a straight roll, and has a diameter smaller than that of the intermediate roll 14.

In the tension leveler, the strip S is passed through the first extension roll unit 1, the second extension roll unit 2, and the multi-roll unit 4 in this order, and is corrected. At this time, the strip S is stretched by the first stretching roll unit 1 and the second stretching roll unit 2,
The warp is corrected by the multi-roll unit 4. The range of the elongation of the strip S is 10% to 20% of the plate width, and the work roll 11 in contact with this region is adapted to the tapered portions at both ends of the intermediate roll 14 to reduce the amount of reduction. This change in the amount of reduction is continuous rather than intermittent,
Changes slowly. Therefore, no stripes are formed on the strip S. Also, the stress distribution of the strip S does not become so uneven.

Next, a tension leveler according to another embodiment of the present invention will be described. FIG. 3 is a front view of the lower roll unit 8A of the first extension roll unit 1 and the lower roll unit 8B of the second extension roll unit 2 in a tension leveler according to another embodiment of the present invention, and FIG. 4 is another embodiment of the present invention. FIG. 5 is a side view of the tension leveler according to the embodiment, and FIG. 5 is an explanatory diagram of a width adjusting operation of the intermediate roll 14 in the lower roll units 8A and 8B.

In FIG. 4, 1 is a first extension roll unit, 2 is a second extension roll unit, 3 is a deflector roll, and 4 is a multi-roll unit. Also in the tension leveler of this embodiment, the strip S runs in the above order. The difference from the embodiment of FIGS. 1 and 2 is that both the first stretch roll unit 1 and the second stretch roll unit 2 use intermediate rolls of tapered rolls for the lower roll units 8A and 8B. Other points are shown in FIGS.
Therefore, the same reference numerals are given to the same parts and the description is omitted.

As shown in FIG. 3, the intermediate rolls 14, 14 are rolls in which a straight portion 14a having the same diameter and a tapered portion 14b having a diameter gradually reduced at one end toward the end are formed. And the first extension roll unit 1
The tapered portion 14b of the intermediate roll 14 and the tapered portion 14b of the second extension roll unit 2 are arranged in opposite directions.

Each of the intermediate rolls 14, 14 is mounted so that it can be advanced and retracted in the axial direction by a known advance / retreat device using a hydraulic cylinder or an arbitrary actuator. For this reason, as shown in FIG. 5, the tapered intermediate rolls 14, 14 are advanced and retracted in accordance with the widths D1, D2 of the strip S to be straightened. Can be brought into contact with the tapered portions 14b, 14b. Further, it is possible to individually adjust the application of the taper to both edges according to the generation range of the ear extension.

Further, as shown in FIG. 4, the first extension roll unit 1 and the second extension roll unit 2 are provided with reduction devices 15 and 15, respectively. Each of the rolling amount adjusting devices 15, 15 is a work roll 1.
Although a well-known structure for adjusting the mesh amount of 1, 11 may be used, each reduction amount adjusting device 15, 15 can be operated separately and independently. Therefore, work roll 1
1, 11 can set different reduction amounts. The multi-roll unit 4 includes a plurality of straight rolls 21 and 22 arranged in a staggered manner with a strip S interposed therebetween, similarly to a known unit.

Also in the above-mentioned tension leveler, the strip S is passed through the first extension roll unit 1, the second extension roll unit 2, and the multi-roll unit 4 in this order.
It is corrected. At this time, the first extension roll unit 1
Then, the strip S is stretched by the second stretching roll unit 2 and the warp is corrected by the multi-roll unit 4.

The range of occurrence of the ear extension of the strip S is 10 to 20% of the plate width. Work rolls 11 and 1
One end can be brought into contact so that the pressure on the ear end can be relieved and this part can be prevented from stretching too much. Further, the degree of taper can be adjusted individually for each edge in accordance with the range of occurrence of ear extension. Moreover, the amount of reduction of each of the work rolls 11 and 11 is individually adjusted, and the elongation of the central portion of the strip S is also freely adjusted, so that an optimum leveling state can be realized.
For this reason, the ear extension generated in the multi-roll unit 4 can be suppressed. For these reasons, proof stress
Correction of 130 kgf / mm ² or more poles hard stainless steel plate is possible. In addition, since the adjustment of the amount of advance and retreat of the intermediate rolls 14 and 14 is easy, there is no need to replace the rolls, the operation efficiency is improved, and the roll cost of spare parts can be reduced.

The tension leveler of the present embodiment is characterized by being capable of leveling an extremely hard stainless steel plate having a proof strength of 130 kgf / mm ² or more. However, the present invention is not limited to this. It can also be used for leveling alloy plates, copper alloy plates, steel plates and the like.

[0023]

According to the first aspect of the present invention, the load during the straightening operation causes the work roll of the straight roll to fit into the intermediate roll having the tapered portion, and both ends of the work roll are gently bent. For this reason, at both ends in the width direction of the strip, the pressure can be released and the ear end can be prevented from being extended too much, so that an ear wave does not occur. And since a work roll adapts to an intermediate roll and bends, since an edge is not formed in a roll, a stripe does not adhere to a strip. In addition, since the correction condition only changes slowly and there is no significant change,
The stress distribution in the strip is also not very uneven. According to the second aspect of the present invention, the intermediate roll can be moved in the axial direction to correspond to any width of the strip, and optimal leveling can always be performed. According to the third aspect of the present invention, the reduction amount of the work roll is individually adjusted to release the reduction so as not to extend the ear end too much, and the ear expansion is suppressed particularly when the edge expansion state of both edges of the plate is different. It is possible to straighten extremely hard steel plates with a proof strength of 130 kgf / mm ² or more.

[Brief description of the drawings]

FIG. 1 is a front view of an extension roll unit of a tension leveler according to an embodiment of the present invention.

FIG. 2 is a side view of a tension leveler according to one embodiment of the present invention.

FIG. 3 shows a lower roll unit 8A of a first extension roll unit 1 in a tension leveler according to another embodiment of the present invention.
FIG. 4 is a front view of a lower roll unit 8B of the second extension roll unit 2.

FIG. 4 is a side view of a tension leveler according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a width adjusting operation of an intermediate roll 14 in lower roll units 8A and 8B.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st extension roll unit 2 2nd extension roll unit 4 Multi roll unit 8 Lower roll unit 11 Work roll 12 Intermediate roll 14 Intermediate roll

Claims (3)

[Claims] 1. A stretch roll unit comprising a stretch roll unit followed by a multi-roll unit, wherein the stretch roll unit comprises:
A tension leveler comprising: a work roll of a straight roll; an intermediate roll having tapered portions formed at both ends for supporting the work roll; and a backup roll for supporting the intermediate roll. 2. A stretch roll unit comprising a stretch roll unit followed by a multi-roll unit, wherein the stretch roll unit comprises:
A first stretch roll unit and a second stretch roll unit are provided. Each of the first and second stretch roll units supports a work roll of a straight roll, an intermediate roll having a tapered portion formed at one end, and each intermediate roll. The intermediate roll of the first extension roll unit and the intermediate roll of the second extension roll unit are arranged with their tapered portions opposite to each other, and the two tapered rolls are freely movable in the axial direction. A tension leveler. 3. The tension leveler according to claim 1, wherein a reduction amount adjusting device is individually provided for each of the extension roll units.