JPS61245917A - Roller leveller - Google Patents

Abstract

PURPOSE:To enable the shape straightening of both thin plate and thick plate with one unit of roller leveller by arranging by removing the internal part residual stress by applying a repeated bending operation on a cold rolled metallic strip sheet and by varying the roll diameter of the roller leveller to straighten the shape. CONSTITUTION:The defective shape of center elongation, lug wave, etc. is caused on a metallic strip sheet because of the internal part residual stress becoming uneven in its longitudinal direction and width direction by the conditions at rolling time and uneven temp. distribution. Four pieces of small levelling roll 11, three pieces of mid levelling roll 12 and four pieces of large levelling roll 13 are arranged in zigzags the upper and lower in progressing direction on the roller leveller device to straighten said defective shape. In case of the shape correction of a thin sheet material B the sheet material B is passed from the small diameter roll 11 in the direction of the large diameter roll 13 and in case of the thick plate material C it is passed from the large diameter roll 13 in the direction of the small diameter roll 11 for shape straightening. The shape correction of both thin and thick sheet materials can be performed with one unit of roller leveller.

Description

Detailed Description of the Invention (Industrial Application) The present invention relates to a roller leveler that removes internal residual stress and corrects the shape of a metal strip rolled by a rolling mill by repeatedly bending it. It is something.

<Prior art> Normally, plate products rolled in a rolling mill suffer from uneven temperature distribution in the longitudinal and width directions during rolling or cooling due to smelting, rolling history, and uneven temperature distribution. As a result, the internal residual stress becomes non-uniform, resulting in local distortions such as middle elongation, ear waves, or half-waves, resulting in defective shapes.

Therefore, various types of o-levellers are used to correct these distortions in the hot or cold state of the plate material. These roller levelers have multiple rollers that sandwich the strip and are arranged in a staggered manner up and down along the direction of movement of the strip.
.

While passing the strip, the strip is bent repeatedly in the vertical direction to equalize the curvature of each part of the strip, and then the curvature of the repeated bending is reduced to zero, thereby correcting the distortion of the strip and removing residual stress. It is something to do.

As an example of such a conventional roller leveler, Figure 3 shows the structure of the most widely used four-stage O-5 leveler. The strip A is sandwiched between a plurality of upper leveling rolls 1 of the same diameter and the same pitch and a lower leveling roll 2 of the same diameter and the same pitch, and the strip A is fed to the left in the figure and vertically moved. I try to give it repeated bending. The pressing force of the upper and lower leveling rolls 1.2 is compensated by the upper and lower backup rolls 3 and 4.
3b. Set the rolling reduction amount (the amount of overlap between the upper and lower leveling rolls 1 and 2, i.e., intermesh) according to the straightening conditions of the strip by tilting the supporting holder 5, etc. to the required value. This is a method of correction. and,
Conventional roller levelers are dedicated to thin plates and thick plates, and are installed in 91 separate locations.

Incidentally, in Figure 3, the material of the band plate: 100'
f/-warp material, plate thickness: T=5w or more, pitch: P=280
m, leveling roll diameter: d=270■, rolling blade:
It is 600t.

(Problems to be solved by the invention) The diameter d of the leveling roll and the pitch P of the leveling roll are determined based on the specifications of the strip A, which is the material to be straightened, the leveling roll shaft, the transmission torque of the drive system, and the load of the backup roll. It is necessary to select the smallest possible leveling roll diameter d and leveling roll pitch P in consideration of the capacity and the straightening effect T on thin plate materials.However, since the straightening reaction force becomes large for thick plate materials, the leveling roll shaft,
It is necessary to increase the transmission torque of the drive system and the load capacity of the backup roll, and the leveling roll diameter d and leveling roll pitch Pf cannot be made small.

Therefore, when the range of plate thicknesses to be handled is very wide, it is difficult to straighten from thin plates to thick plates with one roller leveler. For this reason, as mentioned above, conventional roller levelers are installed separately into two units, one for thin plates and one for thick plates.

Therefore, in order to install two roller levelers, a large space is required, and there is a problem that it becomes impossible to install two roller levelers on the space. Another problem is that installing two units increases the equipment cost.

The present invention has been made in view of the above problems.1
The object of the present invention is to provide a roller leveler that can be applied to both thin and thick plate materials at the stand, thereby reducing installation space and equipment costs.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a roller leveler with a plurality of leveling rolls that clamp the strip plate from above and below, in which the diameter of the leveling rolls is at least It is characterized in that there are two types, and they are arranged in order along the traveling direction of the strip plate every six diameters.

<Function> With the above configuration, leveling rolls with different diameters are arranged in order of size, thin plates are passed from the small leveling roll side, and thick plates are passed from the large leveling roll side. It was designed to be corrected.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 and 2, which are conceptual diagrams of the mechanism according to the present invention.

FIG. 1(a), Q)) shows a first embodiment of the present invention.
A total of 11 leveling rollers are shown, including 4 for the medium-diameter leveling roll 12, and 4 for the large-diameter leveling roll 13. Thin plate material B, which is leveled under light load, is passed from the small-diameter leveling roll 11 side, but the number of leveling rolls that need to be subjected to strong pressure is about 3 to 4 from the receiving side, and the other leveling rolls are slightly Even if it is large, there is no negative impact on the correction effect.

Thick plate materials C to be leveled under heavy loads are passed through from the large-diameter leveling roll 13 side, and there are three to four leveling rolls under heavy loads from the receiving side. Basically, the medium-diameter leveling roll 12 and the small-diameter leveling roll 11 cannot be subjected to strong pressure due to the problem of strong deformation, but there is no particular problem in terms of strength as long as they are used under light pressure.

In terms of the straightening effect, a sufficient straightening effect can be obtained if the effective number of rollers added to the large-diameter leveling roll 13, the medium-diameter leveling roll 12, and the small-diameter leveling roll 11 is 7 to 9. That is, some of the small-diameter leveling rolls 11 on the slope side are operated in a no-load state without applying any reduction amount.

As described above, it is possible to straighten both thin plate materials and thick plate materials with one a-teleber.

In addition, in this example h, the material of plate materials B and C: 1
00Kr/- plate material, plate thickness: Tt = 5~1O■, Tco; 20- or more, pitch: f", = 280-1Pz290
wm, P matter = 300■v P4 ``”' 315-*
Roll diameter: Dt=270-, Dx=290φ, D
s; 315φ, rolling blade: thin plate material, 100-300t, thick plate material, maximum 2000t.

Figures 2 (a) and (b) fi show the second embodiment,
In the figure, there are six small-diameter leveling rolls 21, three medium-diameter leveling rolls 22, and two large-diameter leveling rolls.
3 shows a total of 4 leveling me 413 a-TV viewers. The operation and effect of this second embodiment are similar to those of the first embodiment. In this second embodiment, the material of the plates B and C is 100Kt/- warp, plate thickness: Ts=5 to 1O-1T-thickness=20- or more, and pitch: Pst=280Kt.

Pss=295m, Pts=325mm,
PI3 = 340 pieces, roll diameter 2D4 = 270φ,
Ds=300φ.

Q, = 33Qφ, rolling blade: thin plate material, 100-300t,
Thick plate material, maximum 2000 tons.

In the above two embodiments, the diameter of the leveling roll is set to three types, large, medium and small, but it is also possible to use 2W1 type, 4 types, etc., or to change the diameter for each leveling roll. . Further, although the number of leveling rolls is 11 and 13, the number is not limited to these numbers. Note that the amount of reduction is determined by holder 8.
If the adjustment is done by tilting, the operation is simple and convenient.

<Effects of the Invention> As described above, according to the present invention, it is possible to straighten both thin plate materials and thick plate materials with one A-Teleber, and the installation space can be reduced, equipment costs can be reduced, etc. The effect can be obtained.

[Brief explanation of drawings]

FIG. 1(a) is a conceptual diagram of the mechanism in the case of a thin plate according to the first embodiment of the present invention, FIG. 1(a) is a conceptual diagram of the mechanism in the case of a thick plate,
FIG. 2(a) is a conceptual diagram of the mechanism in the case of a thin plate according to the second embodiment,
FIG. 2(b) is a conceptual diagram of the mechanism in the case of a thick plate, and FIG. 3 is a conceptual diagram of the mechanism of a conventional a-teleber. Also, in the symbols in Figure 1, 11 is a small diameter leveling roll, 1
2t;! Medium-diameter leveling roll, 13 is a large-diameter leveling roll, 21 is a small-diameter leveling CT-roll, 22Fi medium-diameter leveling roll, 23 is a large-diameter leveling roll, B
is a thin plate material, and C is a thick plate material.

Claims (1)

[Claims] A roller leveler equipped with a plurality of leveling rolls that clamp the strip from above and below, characterized in that the leveling rolls have at least two diameters, and are arranged in order along the traveling direction of the strip for each diameter. Laura Leveler.