JP2670886B2 - Bending correction method for multilayer clad metal plate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for straightening a bend of a multilayer clad metal plate.

[Conventional technology and its problems]

As is well known, a clad metal plate is a composite material composed of a dissimilar metal plate of a base material and a laminated material, and the boundary surface is metallurgically bonded. It is used, and is usually manufactured by rolling a clad steel plate rough material with a finish rolling mill. Therefore, since the stretchability, tensile strength and coefficient of thermal expansion (for example, heat shrinkability) differ between the base material and the laminated material in the clad steel material, the clad steel sheet has a longitudinal bend (warp) and a width. A bend in the direction also occurs.

On the other hand, in the normal straightening method for thick steel plates, a hot leveler is installed on the rolling line, and the bending of the steel plate in the longitudinal direction is corrected by this hot leveler, and even if this hot straightening is performed, the desired flatness is still achieved. If you can't get it, add cold correction by cold leveler.

Therefore, when such a normal method for correcting thick steel plate is applied to correct the bending of the clad steel plate, the clad steel plate has a large initial bending in the width direction (see FIG. 4), and thus a sufficient correction effect is obtained. In particular, even if the bending is corrected by a hot leveler, there is a difference in heat shrinkage between the base material and the laminated material due to subsequent cooling. Bending occurs. In order to correct this bending, the cold leveler is repeatedly bent in the longitudinal direction under the condition of a strong reduction amount (No. 5).
(Refer to the figure), the amount of straightening will be larger than that of general thick steel plates, so a large torque is required and the work roll indentation flaws will be created on the surface of the clad steel plate by multiple passes. was there.

Therefore, when straightening the bending of a two-layer clad steel plate, in the hot leveler, a temperature difference with a member with a small heat shrinkage is generated by forcibly cooling the member with a large heat shrinkage before or during hot straightening. Therefore, a proposal has been made to reduce the burden of cold straightening on the cold leveler (see, for example, JP-A-61-162224 and JP-A-61-162225).

However, with the proposed method for straightening the bending of a clad steel plate, temperature control for forced cooling is not easy, and it is difficult to obtain a desired flatness for the clad steel plate.

[Means for solving the problem]

Therefore, the present invention was created in order to solve the problems of the prior art, and the gist thereof is 2
In a straightening method for a multi-layered clad metal plate composed of more than one kind of dissimilar metal plates, the initial bending in the width direction is made flat by the forming roll, or after it is bent backward, it is then bent in the longitudinal direction by the roller leveler. Is a method for straightening the bending of a multi-layered clad metal plate.

〔Example〕

Embodiments of the present invention will be described in detail according to the orthodontic device used to carry out the same.

FIG. 1 is a schematic configuration diagram of a straightening device used for carrying out the present invention, FIG. 2 is a detailed sectional view taken along line A of FIG. 1, and FIG.
FIG. 4 is a modified example of the drawing, and FIGS. 4 to 7 are explanatory views of the bent state of the clad steel plate.

In FIG. 1, reference numeral 1 is a two-layer clad steel plate, for example, a base material 1A is a normal steel plate, and a laminated material 1B is a stainless steel plate (see FIG. 4 or 5). This clad steel plate 1
Is hot-rolled by a finish rolling mill (not shown) and sent on the table roller 2. The clad steel plate 1 has a warp at the tip portion, an edge wave, a center buckle, and the like like those of a normal thick plate steel plate, so that they are corrected, and the bend peculiar to the clad steel plate is
For example, a clad steel plate rolled by a finishing mill has already been bent (a spherical bend as shown in Fig. 4) on the side of a member with a large heat shrinkage before being sent to the hot leveler. In order to correct even the above, the following correction device 3 is inserted.

That is, the straightening device 3 press-corrects the bending of the clad steel plate 1 in the width direction and, at the same time, feeds the clad steel plate 1 to the next step, and the initial bending in the width direction (see FIG. 4). It is composed of a widthwise continuous bending device 5 for bending in a vertical direction and a roller leveler 6 for correcting bending in a longitudinal direction.

Therefore, the clad steel plate 1 is first continuously press-corrected by the pinch rolls 4 which are opened by a larger amount than the bending amount in the width direction. At this time, if the clad steel plate 1 sent is a thin plate or has a small initial bending, there is no correction effect, but even in such a case, the pinch roll 4 arranges the clad steel plate 1 in the next step. A strong pushing force can be applied to the width direction continuous bending device 5, and further, by the width direction continuous bending device 5,
In order to prevent a waist fold 1a that occurs when bending is applied in the opposite direction as shown in FIG. 6 or 7, it is made flat to some extent.

That is, in the widthwise continuous bending device 5, the clad steel plate 1
In addition to correcting the initial bending in the width direction, the amount of bending change from the longitudinal direction to the width direction generated when correcting the longitudinal bending as shown in FIG. 5 in the roller leveler 6 arranged in the next step. Considering in advance, too, the bending in the opposite direction is excessively given.

Then, by inserting the roller into the roller leveler 6, the warp of the tip end portion of the clad steel plate 1, the edge wave, the center buckle, and the like are corrected, and the bending in the longitudinal direction is also corrected. This roller leveler 6 may be a conventional roller leveler which gives a known repeated bending. Note that this longitudinal bending is a combination of the initial longitudinal bending remaining in the clad steel plate 1 and the new longitudinal bending generated by the widthwise continuous bending device 5 arranged in the previous step. In FIG. 1, 20 indicates a hold down roll.

Next, the widthwise continuous bending device 5 will be described in detail. In FIG. 2, 7 is a drum-shaped roll, 8 is a drum-shaped roll, which are vertically combined to form a forming roll. Bending in the width direction of 1 is opposite to that of the initial bending. The roll shafts 9, 9 ... Attached to both ends of the different diameter rolls 7, 8 are supported by the bearings 10, 10 ,.
Reference numeral 0 is connected to a hydraulic cylinder 11 via a rod 12 and is attached to a roll stand 13 so as to be vertically movable. A roll driving device 14 is attached to one end of each of the roll shafts 9 so as to give rotation to each roll.

The widthwise continuous bending device 5 including the forming rolls described above is arranged in two sets in the drawing,
It may be increased or decreased depending on the bending strength of the clad steel plate 1.

Next, a modified example of the widthwise continuous bending device 5 will be described. When the clad steel plate 1 having a wide plate width is dealt with in FIG. 3, the drum-shaped roll 7 and the drum-shaped roll 8 are enlarged. Therefore, the following split rolls are adopted to avoid this.

That is, as the rolls to be positioned on the upper side, the upper small conical rolls 15 and 15 divided into a pair of left and right are adopted, and the small diameter sides thereof are provided to face each other. Further, the rolls to be positioned on the lower side are the lower small conical rolls 16 and 16 divided into a pair of left and right.
And a small support roll 17 provided in the center,
The lower small conical roll 16 is provided so that its large diameter side faces each other.
Therefore, the ears of the clad steel plate 1 are sandwiched between the upper and lower small conical rolls 15 and 16.
In addition, the roll surfaces of the lower small conical roll 16 and the small support roll 17 are formed in a spherical shape so that the clad steel plate can be smoothly bent.

The upper and lower small conical rolls 15 and 16 are individually supported by bearings 18, 18 ..., and these bearings 18 are vertically movable by a worm jack 19. Therefore, not only can it be applied to straightening a wide range of clad steel plates 1, but by adjusting the upper and lower positions of the upper and lower small conical rolls 15 and 16, the bending amount of the clad steel plates 1 around the small support rolls 17 can be adjusted. can do. In addition, in FIG. 3, 21 indicates a bearing portion for a small support roll.

In the above description, the two-layer clad steel plate is taken as an example, but it goes without saying that the present invention is not limited to this and can be applied to a layered clad metal plate (multi-layer clad metal plate). Further, the width direction continuous bending device is not limited to the above-mentioned two examples, and a plurality of backup rolls, which are commonly used for thick steel plates, are arranged in a row in the width direction, and roll bending with a small-diameter flexible working roll is provided. It may be a forming roll composed of a device.

〔The invention's effect〕

According to the present invention, in the forming roll, after giving a flat or reverse bend to the initial bend in the width direction, the roller is subsequently inserted into the roller leveler, so that the initial bend in the width direction can be reliably corrected, As a result, it is possible to surely correct the multilayer clad metal plate. In particular, the roller leveler does not require a large torque and does not cause a roll-indented flaw on the product surface.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a straightening device used for practicing the present invention, FIG. 2 is a detailed sectional view taken along line A of FIG. 1, FIG. 3 is a modification diagram of FIG. 2, and FIGS. The figure is an illustration of the bent state of the clad steel plate. 1 ... Clad steel plate, 5 ... Width direction continuous bending device, 6 ... Roller leveler.

Claims (1)

(57) [Claims] 1. A straightening method for a multi-layered clad metal plate comprising two or more different kinds of metal plates, wherein after the initial bending in the width direction is formed by a forming roll, it is made flat or reversely bent, and subsequently, A method for correcting the bending of a multilayer clad metal plate, which comprises correcting the bending in the longitudinal direction with a roller leveler.