JPH0957313A - Method for cold-rolling aluminum plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong roll life and also to prevent deterioration of the surface quality of a rolled plate by dissolving the problem of roll coating caused in cold rolling of an aluminum plate. SOLUTION: In a cold rolling mill, by providing brush rolls 8 to work rolls 4 for rolling the aluminum plate 2 and revolving the work rolls 4 as contacting with the brush rolls 8, roll coating sticking to the surface of the work roll 4 is removed with the brush roll 8.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for cold rolling an aluminum plate material, and more particularly, in cold rolling of an aluminum plate material made of aluminum or an aluminum alloy, a roll coating generated on a work roll is removed to replace a roll, As a result, the present invention relates to a method capable of effectively extending the roll life.

[0002]

2. Description of the Related Art Conventionally, in cold rolling of an aluminum plate material made of aluminum or aluminum alloy, aluminum powder or oxide is fixed on the surface of a work roll, which is a rolling roll, to form a thin film, so-called roll coating. It has been found that this has a significant effect on the surface quality of the rolled sheet. In addition, such a roll coating is formed on the work roll in a width equal to the width of the rolled material, and as a result, the following measures are inevitable.

That is, when the width of the sheet material to be rolled next becomes wider than the width of the sheet material before being rolled, the sheet surface property of the sheet material obtained by rolling is determined at the position of the width of the sheet material before. On the other hand, from the point where a clear streak pattern is formed at the boundary, the rolling operation is performed in order from the widest one, and the work rolls are exchanged when the narrowest material is rolled.

The work roll can generally be used until its surface roughness becomes smaller than a required value due to wear during rolling, but in most cases, before the work roll becomes unusable due to such surface roughness reduction. , They have been replaced to cause the roll coating problems described above.

Ordinary forged steel rolls and the like are used as the work rolls. However, when such rolls are plated with chromium, the wear of the roll surface is reduced, and the wear of the rolls is reduced compared to such forged steel rolls. Although the amount is about 1/5 to 1/7 and the roll life can be expected to be greatly extended, the effect cannot be obtained in reality due to the above-mentioned problem of roll coating. Is also inherent.

[0006]

The present invention has been made in view of such circumstances, and its object is to solve the problem of roll coating caused in cold rolling of an aluminum plate material. Another object of the present invention is to provide an effective method for extending the roll life and preventing the deterioration of the plate surface quality of the rolled plate material.

[0007]

In order to solve the problem, the present invention relates to a work roll for rolling the aluminum sheet material of the cold rolling machine in cold rolling of the aluminum sheet material by the cold rolling machine. An aluminum characterized in that a brush coating is installed, and the work roll is rotated while being brought into contact with the brush roll so that the roll coating adhered to the surface of the work roll can be removed by the brush roll. The gist of the invention is a cold rolling method for a plate material.

Therefore, in such a method of the present invention, since the brush roll is installed on the work roll of the cold rolling mill, the brush roll is fixed to the surface of the work roll by such a brush roll. It is possible to effectively remove the roll coating, which can effectively prevent the deterioration of the plate surface quality of the rolled plate material due to the accumulation of roll coating, and due to the wear of the roll, its surface roughness is lower than the required value. Since the rolls can be used until they become smaller, the number of roll replacements can be reduced, and the operating rate can be effectively improved, and the roll life can be extended. It was possible to be done.

In particular, such removal of the roll coating brings about an extremely great effect in the work roll having the surface provided with the chrome plating layer.
The characteristics of the chrome-plated layer can be maximized, and thus the roll life can be significantly extended, and the reduction of roll wear greatly contributes to the reduction of the number of roll replacements. Significant improvements can be achieved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As is well known, an aluminum plate made of aluminum or an aluminum alloy is hot-rolled by using a corresponding aluminum ingot or aluminum alloy ingot. After being manufactured by the above method, it is cold rolled using a single four-high rolling mill, a tandem four-high rolling mill, etc., with appropriate intermediate annealing, to obtain a plate-shaped aluminum product with a desired thickness. However, in the present invention, a brush roll is installed on a work roll (rolling roll) in such a cold rolling mill, and the brush roll fixes the work roll surface. It is designed to remove the roll coating, an example of which is
This is shown in FIG.

Specifically, FIG. 1 shows an example of a single four-high cold rolling mill, in which an aluminum sheet 2 to be cold rolled is supplied between upper and lower work rolls 4, 4. The work rolls 4, 4 are cold-rolled at a predetermined reduction ratio, and the work rolls 4, 4 are supported so as to support the work rolls 4, 4.
The back-up rolls 6 and 6 are arranged behind the roll No. 4, and the rolling mill has a structure of a total of four rolls. Brush rolls 8 and 8 are installed axially parallel to the respective work rolls 4 and 4 and are driven to rotate so that the contact portions with the corresponding work rolls 4 are rotationally contacted in opposite directions. It can be done. Each of the brush rolls 8 is formed by implanting a brush made of nylon, steel or the like on the roll surface, and the work rolls 4 rotating at a low speed while rotating the brush rolls 8 having such a configuration. By pressing against, the roll coating adhered to the surface of the work roll 4 can be easily removed.

Then, in the cold rolling of the aluminum sheet material 2 using the cold rolling machine having such a structure, the operation of removing the roll coating of the work roll 4 by the brush roll 8 is not always carried out but one operation. After the rolling of the aluminum plate material is completed, it is carried out before starting the rolling of the next aluminum plate material,
In particular, since the thickness of the roll coating adhered to the surface of the work roll 4 becomes thicker, good plate surface quality cannot be obtained in the cold-rolled product, or the width of the cold-rolled aluminum plate material 2 is smaller than the previous one. When it is wider than the material to be rolled, the removal of the roll coating using the brush roll 8 is advantageously performed. The roll coating removed by the brush roll 8 is generally washed off with a coolant, and a part of the roll coating is taken into the brush roll 8.

Further, by removing the roll coating on the work rolls 4, there is no restriction on the rolling order due to the plate width of the aluminum plate material 2. Therefore, even if the work rolls 4 are kept cold-rolled, their surface is not restricted. As long as the roughness is maintained at a predetermined value or more, the rolling can be continued without exchanging the rolls, whereby the roll life can be extended and the operating rate can be effectively improved.

The brush roll 8 provided axially parallel to the work roll 4 is generally provided with an axial length equal to or larger than the maximum width of the aluminum sheet material 2 to be cold-rolled. Further, while reciprocating the brush roll 8 in the axial direction, the work roll 4
By contacting with the work roll 4, the roll coating adhered to the surface of the work roll 4 can be removed more effectively, and a uniform roll surface can be obtained in a short time.

When the work roll 4 has a chrome-plated layer on its surface, the roll surface hardness is so high that the roll surface roughness is lowered due to the progress of the rolling operation. Can be significantly relaxed, and, with it, the roll coating thickness of the plated surface is much thinner and easier to peel off than in the case of a normal forged steel roll surface, so that the roll by the brush roll 8 according to the present invention is By removing the coating, the effects of the present invention can be synergistically exhibited.

That is, since the roll coating on the surface of the work roll 4 can be easily removed by the brush roll 8 and the cold rolling using such a work roll 4 can be performed again, The hardness improving effect of the chromium plating layer formed on the surface of the work roll 4 can be maximized, and the reduction of the roll surface roughness due to rolling can be effectively suppressed, thereby reducing the number of roll replacements. By obtaining it, the improvement of the operating rate can be achieved, and at the same time, it can effectively contribute to the extension of the roll life.

Incidentally, according to the result of the lab rolling test conducted by the present inventors, the average surface roughness of roll: Ra =
When cold rolling is performed under the conditions of 0.5 μm and total length of rolled aluminum alloy material = 8 km, a work roll made of a normal forged steel roll (without chrome plating) has a thickness of 0.029 μm. Whereas the coating was produced, the work roll having the chromium plated layer on the forged steel roll was only produced with a roll coating having a thickness of 0.011 μm, and such a roll coating was made of nylon. It could be easily removed by sliding a brush roll using a brush.

In addition to the specific examples described above, the present invention can be variously modified, modified, improved, etc. based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Of such embodiments,
It should be understood that both are within the scope of the present invention.

[0019]

As is apparent from the above description, according to the cold rolling method for an aluminum plate material according to the present invention, the roll coating generated on the surface of the work roll is removed by the brush roll. It is possible to effectively prevent the deterioration of the rolled material plate surface quality due to the accumulation of such roll coating, and it is also possible to effectively reduce the number of times the work rolls are replaced, and the improvement of the operating rate is achieved. Furthermore, an effective extension of the roll life can be achieved, and there lies a great technical significance of the present invention.

[Brief description of drawings]

FIG. 1 is a side view illustrating an example of a cold rolling mill used in the present invention.

[Explanation of symbols] 2 Aluminum plate 4 Work roll 6 Backup roll 8 Brush roll

Claims (2)

[Claims] 1. In the cold rolling of an aluminum sheet material by a cold rolling mill, a brush roll is installed for a work roll for rolling the aluminum sheet material of the cold rolling machine, and the work roll is provided by the brush. A method for cold rolling an aluminum sheet material, wherein the roll coating adhered to the surface of the work roll can be removed by the brush roll by rotating the work roll while contacting the roll. 2. The method for cold rolling an aluminum sheet material according to claim 1, wherein the work roll has a chromium plating layer on the surface thereof.