JPS5884614A - Roller leveller - Google Patents

Abstract

PURPOSE:To obtain a roller leveller used for levelling all kinds of failures in flatnesses of strips to be rolled, by separating plural leveller rolls into >=2 groups having different peripheral speeds respectively, and further, by slanting work rolls or using small work rolls, etc. CONSTITUTION:For levelling the malflatness such as malformation, defective warp, and camber of a roll strip after having passed through pinch rolls 2, zigzag arranged plural leveller rolls 3 of a roller leveller 1 are separated into groups A and B and are constituted to drive the groups separately by different motors M2 and M3 through gear boxes 41 and 42 respectively. In levelling, the peripheral speed of rolls of the group A, placed on the upstream side with respect to the advancing direction of the material, is set smaller than that of the group B to generate and axial force in the material. Further, the levelling capacity is improved by making the rolls of the group A free from driving mechanism or making them smaller in diameter, or by slanting the rolls in the horizontal plane or vertical plane with respect to the material surface.

Description

[Detailed description of the invention] The present invention relates to a roller leveler.

A typical example of a conventional roller leveler is shown in FIG.

The roller leveler 1 is made up of a pair of pinch rolls 2 and a plurality of leveler rolls 3 arranged in a staggered manner. The pinch rolls 2 are driven by a motor M, and each roll 3 is simultaneously driven by one motor M2 through a gear box 4. pinch roll 2
and the leveler roll 3 may be driven by one motor.

The pinch roll 2 serves to feed the material, and in the case of a reciprocating leveler, is provided on the entrance/exit side of the leveler roll.

The repeller roll 3 is usually supported by several rows of back-up rolls (not shown) to compensate for deflections. The amount of reduction (the amount of relative penetration between the upper and lower rolls) can be set separately for the entry and exit sides, and leveling is performed with tilting.

The flatness defects of rolled steel strips can be roughly classified into shape defects and warpage defects. Shape defects are caused by differences in elongation of the material in the longitudinal direction, and cannot be corrected without imparting plastic elongation to the material.

Roller leveler has poor warpage (especially warpage in the longitudinal direction)
It is designed to correct the shape and reduce residual stress, so its ability to correct shape defects is low.

In order to give plastic elongation to a material with a roller leveler, it is necessary to actively apply axial force. With conventional roller levelers, the residual stress in the material and the frictional force generated between the roll and the material only act as a slight axial force, and basically they cannot impart plastic elongation, and their ability to correct shape defects is low. .

Furthermore, camber, which bends significantly in the longitudinal direction, occurs in the rolled steel strip. Conventional roller levelers cannot raise the camber. The principle of camber correction is to either stretch the curved inside part more than the outside part, or change the direction of movement of the material to give it a bend in the opposite direction to the camber.

Therefore, an object of the present invention is to obtain a roller leveler capable of correcting warpage defects, shape defects, or camber of a rolled steel strip.

The roller leveler of the present invention has two leveler rolls.
The material is divided into three or more groups, and the peripheral speeds of the rolls in each group are differentiated to generate axial force in the material to improve the shape correction ability, and if necessary, the rolls of at least one of these groups The camber is corrected by being configured to be tiltable in a horizontal plane, a vertical plane, or both sides with respect to the material surface.

The basic structure of the roller leveler of the present invention will be explained below, taking as an example a structure divided into two groups shown in FIG. The roller leveler 1 of the present invention has almost the same structure as the conventional leveler shown in FIG. 1, but the leveler roller 3 is divided into two groups A and B, and each group A and B is connected to a motor M2 and box 41 and motor M3 and gear box 42, respectively. Therefore, the rollers of groups A and B are driven separately.

For leveling, the circumferential speed of the rolls of group A on the upstream side in the direction of movement of the material is set to be smaller than the circumferential speed of the rolls of group B on the downstream side. Preferably, motor M2 may be stopped 17 so that all rolls to the group are not driven.

Furthermore, it is preferable that the diameter of the low circumferential speed or non-driven roll is smaller than the diameter of the high circumferential speed roll. This is effective in imparting strong bending and generating large axial force.

Furthermore, if necessary, the work rolls 3 of at least one of the groups A and B are configured to be tiltable at an inclination angle α (third south) in a horizontal plane with respect to the surface of the material, and also to be tiltable in a vertical plane. It is configured to be tiltable at an angle of inclination β (FIG. 4). The roll inclination in the horizontal plane is for each group A and B.
It is preferable to carry out the roll inclination in the vertical plane for group A.

When the roll 3 is tilted in a vertical plane, as shown in FIG. 4, the relationship between the tilt angle β and the reduction amount difference δ is expressed by the following equation, where W is the width of the material.

δ=Wtanβ As a modification 10 of the roller leveler of the present invention, as shown in FIG. 5, two identical conventional roller levelers 1 are provided,
A configuration that provides a difference in the roll circumferential speed of both rollers, or a sixth
As shown in the figure, it is also possible to adopt a configuration in which non-driven roller levelers la and lb are provided on the inlet side of a conventional reciprocating roller leveler 1.

In order to generate plastic elongation by applying axial force to the material, for example, as shown in FIG.
Pull out the material between B. Table 1 shows the results of the leveler pulling experiment conducted in this manner.

In this experiment, there was no drive, and the diameter of the repeller roll was 50wL.
The number of straightening materials was 5, and the straightening material used was aluminum with a thickness of 3 cranes, a width of 250 m, and a length of 1500 zm. The results of this experiment are shown in FIG. As shown in Table 1 and Figure 7,
The defective shape of the material (steepness λ) has been well corrected.

Modifying the camber of the Tanobe material, as described above, involves tilting the leveler roll in the horizontal plane or in the vertical plane or in both directions. FIG. 8 shows the experimental results when the leveler rolls (50 mm in diameter x 11 rolls) were tilted in a vertical plane. As mentioned above, the reduction amount difference δ (gap) in FIG. 8 is opposed to the inclination angle β (') in FIG. 4.

FIG. 9 shows the experimental results when the roller leveler 1B on the downstream side was tilted in the horizontal plane in the roller leveler (diameter 60 m x 7 roller levelers, 2 units) shown in FIG. 9th
As can be seen from the figure, as the inclination angle α of the roller 3 in the horizontal plane increases, the camber amount ΔC increases. The camber amount ΔC in this case refers to the maximum amount of curvature for a material length of 5 m.

Therefore, more effective camber correction can be achieved by inclining the leveler roll in the horizontal plane or in the vertical plane, respectively.

Next, an embodiment of the Lonilla Leveler of the present invention will be described.

<Example 1> Leveling of an aluminum cut plate was carried out using a roller leveler having the configuration shown in FIG. A total of 11 repeller rolls with a diameter of 50 μl were used.

At the beginning of leveling of the cut board, all flat rolls are 3.
to drive. When the tip of the cutting plate advances to the middle part of the leveler group B, the motor M2 driving the roll 3 of the leveler group A on the upstream side with respect to the material traveling direction is stopped. As a result, the longitudinal direction of the cut plate is 0.15
% plastic elongation occurred, and the shape of the cut plate was significantly modified.

<Example 2> In the roller leveler of Example 1, the roll 3 of group A on the upstream side was set to have a rolling difference δ of 1 in the vertical plane with respect to the surface of the rolled material, and an inclination angle α in the horizontal plane. It was set at 10°.

At this time, the amount of camber △c = 3 wh / 5 m
There has occurred. Next, using the cut plate where this camber has occurred as a material, we set the reduction amount difference δ and the inclination angle α by the same amount in the opposite direction to the previous one, and then leveled again, and the camber mentioned above was corrected. Ta.

<Example 3> In the roller repeller having the configuration shown in FIG. 6, leveling was carried out on an aluminum cut plate having a thickness of 4 stripes×width of 3QQa:X:length of 400011B. The roll diameter of the roller repeller 1 was 7Qm, and nine rolls were used. Non-driven repeller 1 installed on the exit side of the roller leveler 1. a, 1
．． The roll diameter of b was 3Qmi on the top and 50mm on the bottom, and 5 rolls were used.

First, the cut plate was passed in the right direction, and when the tip of the cut plate reached the middle part of the roller leveler, the leveler 1a was strongly pressed down. It was impossible to measure the elongation when the leveler 1a was not used, but when the leveler 1a was used, an elongation of 0.3% was measured on the cut plate.

Next, when leveling was carried out in the left direction and the leveler 1b was strongly pressed down and the roll was tilted by 8 degrees in the horizontal plane, camber occurred in the cut plate.

In order to correct this camber, leveling in the right direction was performed and a reduction amount difference δ=15 words was applied to the leveler 1a, and the camber was almost eliminated.

Next, medium elongation and ear wave shape defects with a steepness of λ-3% were artificially formed on another rolling line, strong rolling was performed using the repeller 1a, and drawing was performed using the leveler 1. When leveling was performed, medium elongation and Both ear waves were resolved.

In addition, the pinch roll can be changed to leveler 1 and lat or leveler 1.
and 1b, more effective material feeding can be obtained.

<Example 4> Using a roller leveler having the configuration shown in FIG. 5, leveling was carried out on a lead cut plate having a thickness of 4 sides x width of 3QQMX x length of 3000 m. Each roller leveler IA, 1. B
The diameter of the roller was 601B, and seven rolls were used.

First, the levelers IA and IB were stopped in a state where the cutting plates were caught in the levelers IA and IB, and then the rolls of the leveler 1B were tilted by 10 degrees in a horizontal plane to forcibly give camber. Furthermore, it was confirmed that the inclination angle α was set to 09, the leveler IB was moved in the leveling direction, and the cut plate could be pulled and elongated, that is, the leveler could be used as a chuck mechanism when deforming the cut plate.

Next, when passing through levelers IA and IB, the roll peripheral speed of leveler 1B was set higher than the roll peripheral speed of leveler IA, and leveling was performed while applying a tensile force to the cut plate. Elongation was obtained.

<Example 5> As shown in Fig. 10, levelers consisting of 13 pieces with a diameter of 1.01 B are configured into three groups A, B, and C, motor M2 is controlled ON and OFF, and motors M3 and M
4 enables circumferential speed difference control. Thickness: 4 stories x Width: 500B
When leveling an aluminum plate with a length of 5,000 mm, turn off the motor of leveler group A when the tip of the cut plate leaves the center of leveler group B.
It was confirmed that when the circumferential speed of the repeller group C was made 15 times faster than that of group B, an elongation rate of 1% was obtained.

Next, when the levelers of leveler groups A and C were tilted 10 degrees each in the horizontal plane under the same conditions as above, the result was 5w15m.
camber occurred.

It was also confirmed that when leveling groups A, B, and C are leveled at the same speed, the plastic elongation is O when the rolling reduction is small, and even if the rolling reduction is large, the elongation can only be about 0.005% at most.

When the roller leveler of the present invention is applied to thick plates, hot-rolled materials such as shaline levelers, etc., it is possible to achieve particularly effective flatness correction and camber correction, and it is possible to improve yield.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional roller leveler. FIG. 2 is a schematic diagram showing the basic configuration of the roller repeller of the present invention. FIG. 3 is an explanatory diagram showing the case where the leveler roll is inclined in a horizontal plane with respect to the surface of the material. FIG. 4 is an explanatory diagram showing the case where the repeller roll is inclined in a plane perpendicular to the surface of the material. FIGS. 5 and 6 are schematic configuration diagrams showing modified examples of the roller leveler of the present invention. FIG. 7 is a graph showing the results of a material drawing experiment conducted using the roller leveler of the present invention. FIGS. 8 and 9 are graphs showing the relationship between the reduction amount and inclination angle of the leveler roll and the camber amount. FIG. 10 is a schematic configuration diagram showing a modification of the roller leveler of the present invention. 1: Roller leveler 2: Pinch roll 3X leveler
Roll 4: Gear box patent applicant Sumitomo Metal Industries, Ltd. (2 others) Figure 4 Figure 6 ('?), (uJc;

Claims (4)

[Claims] (1) A roller leveler in which a plurality of leveler rolls arranged in a staggered pattern are divided into two or more groups, and the circumferential speed of the work rolls in each group is differentiated to generate axial force on the material. (2) Divide the plurality of leveler rolls arranged in a staggered manner into two or more groups, make a difference in the peripheral speed of the work rolls of each group, generate an axial force on the material, and at least one of the groups A roller leveler in which two groups of work rolls can be tilted in the horizontal plane, vertical plane, or both sides with respect to the material surface. (3) The roller leveler according to claim (1) or (2), characterized in that work rolls in at least one of the groups are non-driven. (4) Low circumferential speed''!, or the diameter of the work rolls in the non-driving group is made smaller than the diameter of the work rolls in the driving group. 3) The roller leveler described in any one of the items up to item 3).