JPS60238036A - Roller leveler - Google Patents

Abstract

PURPOSE:To improve considerably the capacity for leveling a sheet material with simple modification of the conventional roller leveler in a roller leveler which passes the sheet material between upper and lower leveling roll groups by providing a pinch roll group before said roll groups on the sheet feed side. CONSTITUTION:The sheet material 3 having a defective shape is fed between the upper and lower rolls of the leveling roller group A constituted of the upper and lower leveling rolls 1, 1..., 2, 2..., by which the shape is corrected. The pinch roll group B consisting of the roll pairs of upper and lower pinch rolls 4, 5 is provided before the roll group A on the material 3 feed side. The group B grasps under the pressure the material 3 between the rolls 4 and 5 and transfers the material into a direction X so as to feed the material into the group A. The internal stress distribution of the defective shape material having edge waves is thus increased and the stress distribution is created particularly in the top end of the sheet as well. The satisfactory leveling effect is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller leveler that corrects the shape of a metal plate such as a rolled steel plate.

Metal plate materials such as thick steel plates and thin steel plates rolled by rolling mills, etc., may have ear waves, middle waves, etc. due to uneven shaping in the width direction during rolling and uneven temperature distribution during cooling. This causes shape defects such as elongation and poor flatness. Therefore, a roller leveler is installed that allows the plate material to pass between the upper and lower leveling roll groups, and applies plastic deformation to the plate material between the upper and lower rolls to correct the shape of the plate. In particular, at the rear end of the plate rolling line, a tilting rolling type roller leveler is usually installed to correct defects in shape and flatness of the rolled plate. The tilting reduction method referred to here means that the amount of reduction of the upper and lower leveling rolls is adjusted back and forth (
It is constructed so that it can be adjusted in an inclined manner (for example, the rolling reduction on the entry side is large and the rolling reduction on the exit side is small) in the direction of plate advancement.

However, in recent years, with the adoption of technologies such as temperature controlled rolling and accelerated cooling, the temperature of the plate material reaching the roller leveler has decreased and the shape has deteriorated. On the other hand, with conventional roller levelers, the head end of the plate is free from being rolled down by the leveling rolls on the plate feeding side, so sufficient plate thickness stress is not generated, and therefore plastic deformation occurs in the plate. There was a problem that complete correction could not be performed.

In view of the above-mentioned problems, the present invention has been made for the purpose of providing a roller leveler that can greatly improve the sheet material straightening ability by simply modifying the conventional roller leveler.

The roller leveler of the present invention is a roller leveler that corrects the shape of a plate by passing the plate between the upper and lower leveling roll groups as described above. It is characterized by the provision of a group of pinch rolls for feeding the plate. By pressing the sheet material through the pinch roll group and sending it to the leveling rolls, it is possible to straighten the head end of the sheet material, which was previously impossible9, and it is possible to completely straighten the sheet material.

FIG. 1 is an explanatory diagram showing one embodiment of the configuration of a roller leveler according to the present invention. Upper leveling roll 1.1. ... Herring roll 2.2. A group of leveling rolls A is constituted by the above, and a plate material 3 with a defective shape is fed between these upper and lower rolls, and the plate material 3 is plastically deformed by repeated bending to correct its shape. This configuration is similar to a conventional roller leveler. In the figure, an arrow X indicates the direction in which the plate material 3 moves (passing direction).

In the present invention, the plate material 3 of the leveling roll group A
A pinch roll group B is installed on the front surface of the feeding side to align the upper pinch roll 4 and the lower pinch roll 5. This pinch roll group B pinches and presses the plate material 3 between the upper pinch roll 4 and the lower pinch roll 5, and feeds the plate material in the direction of arrow X to the leveling roll group A. In the illustrated example, the pinch roll group B is composed of three pairs of pinch rolls, but the invention is not limited to this illustrated example, and one pair or any plurality of pairs of pinch rolls can be used as necessary. Setting is something you get.

Next, a description will be given of the operation of straightening a sheet material using the roller leveler according to the invention.

When a board with shape defects such as ear waves and mid-elongation enters the pinch roll group B, a stress distribution Δσ of steepness expressed by the following equation is created in the board width direction.

Here, E is Young's modulus, and λ is the steepness representing the shape defect of the plate shown in FIG. 3, that is, the ratio h/no of the plate corrugation height h to the plate corrugation Pitzino.

FIG. 2 shows the stress distribution in the width direction within the board surface when a material with a defective shape of the ear waves is pressed by the pinch rolls 4 and 5 of the pinch roll group B. When a plate having a stress distribution as shown in the figure is repeatedly bent by the leveling roll group A shown in Fig. 1, it undergoes plastic deformation, causing the central part of Iiyama to elongate and the edges of the plate to contract.

As a result, the difference in length in the longitudinal direction of the plate in the width direction of the plate is reduced, and defects in the shape of the plate are corrected.

If pinch roll group B is not available, leveling roll group A
Since the incoming board is only held down by the leveling rolls, the stress distribution in the board becomes smaller than when there is pinch roll group B, as shown by the broken line in Figure 2.
The correction effect becomes smaller accordingly. Especially at the head end of the board,
If there is no pinch roll group B, no correction effect can be expected. By providing the pinch roll group B, not only the straightening effect is increased due to the stress distribution within the plate material as described above, but also the stress distribution is created at the head end of the plate, so that a straightening effect can be expected.

As is clear from the above explanation, according to the present invention, by installing the pinch roll group in front of the plate material feeding side of the leveling roll group of the roller leveler, the plate reaching the roller leveler can be Even if a conventional roller repeller cannot correct the shape due to a defective shape, a sufficient correction effect can be exerted. In addition, it is possible to correct the head end of the plate material, which cannot be corrected with conventional roller levelers, and the correction ability of the roller leveler can be greatly improved. Moreover, since the present invention only requires adding a pinch roll group to the configuration of a conventional roller leveler, it can be easily applied to existing equipment to achieve the purpose.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the structure of the roller leveler of the present invention, FIG. 2 is a diagram showing the stress distribution of a plate material pressed by pinch rolls, and FIG. 3 is an enlarged view of a defective shape of the plate material. In the drawings, 1 is an upper leveling roll, 2 is a lower leveling roll, 3 is a plate material, 4 is an upper pinch roll, 5 is a lower pinch roll, A is a leveling roll group, and B is a vinyl roll group. Patent applicant Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] In a roller leveler that corrects the shape of a plate by passing the plate between upper and lower leveling roll groups, the plate is pinched from above and below on the front surface of the plate material feeding side of the leveling roll group,
A roller leveler characterized by having a group of pinch rolls for feeding the plate.