JPH0234209A - Roll for cold rolling - Google Patents

Abstract

PURPOSE:To obtain a cold rolled stock having good shape accuracy by installing a heat generating conductive layer on the outside periphery of a roll body in an electrically insulated layer condition and making a heat crown of the roll in a changeable and optionally setting situation by energizing the layer through electrodes to heat the body. CONSTITUTION:A heat generating conductive layer 3 is installed on a roll body 1 by putting an electric insulation layer 2 between the layer 3 and body 1 and a feed controller 7 is connected with annular electrodes 5 of the layer 3 through feed brushes 6 sliding on the electrodes 5. A stock 8 to be rolled is made of Al (alloy). A layer of ZnO2 as the 1st insulation layer 2 is formed on the peripheral surface of the body 1 and W powders are printed on the surface of the layer 2 and are sintered to make a heat generating conductive layer 3. Arrangement density of the layer 3 is increased in the central part (c) of the roll body 1. Annular electrodes 5 are mounted and the outside surface of the layer 3 except parts of the electrodes 5 is covered with an electric insulation layer 4 of ZnO2. The layer 3 is energized to generate heat through brushes 6 and the electrodes 5 so that the Al stock 8 is rolled. Thus, a heat crown is corrected, variance in elongation generated in the stock 8 is reduced, so that a cold rolled stock having good shape accuracy is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to cold rolling rolls, particularly cold rolling rolls used in the production of aluminum or aluminum alloy thin sheets and foils.

Conventional techniques and their problems In recent years, requirements for shape accuracy of cold-rolled aluminum and aluminum alloys have become increasingly strict, and shape control during rolling has become an important issue.

On the other hand, in cold rolling rolls, a so-called heat crown occurs due to the thermal effect caused by rolling, and this often causes variations in the thickness distribution of the workpiece in the rolling width direction and length direction. Are known.

Conventionally, in order to avoid the negative effects caused by the occurrence of heat crown, a crown was added to the roll shape itself in advance to offset the heat crown, or V
By adjusting the rolling interval using C rolls and bender rolls, and adjusting the temperature, supply amount, and spray pressure of lubricating oil,
Efforts are being made to make the temperature distribution of the rolls uniform in the rolling width direction.

However, the above-mentioned conventional technical means do not attempt to control the heat distribution of the rolling roll itself, so they cannot be used as a fundamental solution to avoid the negative effects of heat crown on the rolling roll. Coupled with the possible difficulty of control, it is still not possible to obtain sufficient satisfaction in reducing the variation in the widthwise distribution of elongation of sheet materials and foil materials obtained by cold rolling. Ta.

Means for Solving the Problems In view of the problems of the prior art as described above, the present invention equips the rolling roll itself with a heat generating means for correcting the heat crown caused by rolling, thereby making the temperature distribution uniform. It is designed so that it can be measured.

That is, in the present invention, a heat generating conductive layer is provided on the outer circumferential surface of the roll body in an insulating coating state, and the heat generating conductive layer is energized through an electrode provided on a part thereof to generate heat, thereby heating the roll. The object of the present invention is to provide a cold rolling roll characterized by having a crown that can be freely set variably.

In fact, in order to reliably correct the heat crown, it is necessary to variably control the amount of heat generated by the heat generating conductive layer between each section in the rolling width direction. Therefore, for this purpose, the heat-generating conductive layer is divided into a plurality of divided regions having different heat generation amounts in the length direction of the roll body, and the energization is controlled for each divided region. It is desirable to do so.

When the heat generating conductive layer is formed by pattern printing, the above-mentioned change in heat generation amount between the divided areas may be caused by a change in the printed pattern that differs in its actual distribution density, or by the thickness, width, or spacing of the heat generating conductive layer. , material, number of layers, etc., by any combination of one or more of them.

Furthermore, the heat-generating conductive layer is formed with insulation coating on both sides. Therefore, first the first insulating layer is formed on the outer peripheral surface of the roll body, and then the heat-generating conductive layer is formed thereon. , and the outer peripheral surface thereof is further covered with a second insulating layer. As the material of the insulating layer, for example, ZrO2
is preferably used. On the other hand, in the conductive layer, as a resistance heating element, for example, W or other metal powder as a resistor, A
One type or a mixture of two or more types of conductive ceramic powders such as c1 o3 and Ti C are used. Then, a conductive layer is formed by applying the material, preferably by a pattern printing technique, in such a manner that a required amount of heat is generated in each part, and firing.

Note that in order to improve the adhesion between the first insulating layer and the roll body, a binder may be used between the two. Also, the second
In order to prevent the insulating layer from peeling off, the outermost layer may be coated with a shedding prevention material layer.

It is simple to apply electricity to the heat generating conductive layer by bringing a carbon brush into sliding contact with the electrode of the conductive layer provided at the end of the roll body, but it is not limited to this. It's not a thing.

For example, the heat generating conductive layer is formed in such a manner that the amount of heat generated near the ends of the roll is smaller than that at the center, and by energizing this layer to generate heat during rolling, the layer can be formed over the entire length of the rolling roll. It is possible to balance the heat generation associated with rolling and make the temperature distribution uniform. Therefore, it is possible to correct the heat crown caused by the thermal effect that occurs with ζ rolling, and in turn, the elongation distribution of the rolled material can be made uniform in the rolling width direction, thereby improving the flatness of the rolled plate or foil material.

Embodiment FIG. 1 is a diagram showing the configuration of a cold rolling roll according to the present invention in an easy-to-understand manner. first insulating layer, (
3) is a heat-generating conductive layer further formed thereon, (4) is a second insulating layer further formed on the outer peripheral surface thereof, and (5) is a conductive layer (3) provided on the outer peripheral surface of the roll end. Annular electrode, (6
) is the power supply brush that comes into sliding contact with this, (7) is the power supply controller,
(8) indicates a rolled material made of aluminum or aluminum alloy.

In a rolling roll having the basic configuration as described above,
In the first embodiment, a 5 μm thick film made of ZnO2 is formed as the first insulating layer (2) on the outer peripheral surface of the roll body (1), and then W powder is applied to the surface by a pattern printing technique. was applied by printing in a predetermined pattern and sintered to form a heat-generating conductive layer (3). As shown in FIG. 2, the conductive layer (3) has a higher density in the central region (c) than in the end regions (a) and (b) of the roll.
By printing in a pattern that increases the arrangement density, the amount of heat generated near the ends of the roll is set to be smaller than that at the center. The conductive layer (3) is provided with an annular electrode (5) at the end of the roll, while the outer surface of the conductive layer (3) excluding the electrode portion is covered with a 10 μm thick second insulating layer made of Zn 02 as described above. (4
) coated with

Then, while rotating the rolling roll, brushes (6
) and the heating conductive layer (3) via the electrode (5),
This generates heat, and in this heat-generating state, the aluminum material (8) as the material to be rolled is rolled to a thickness of 0.93 m to 0.6 m.
It was rolled to 7#W. As a result, in an aluminum material with a width of 930 IjIIR, the amount of shape change in the width direction after rolling is approximately 16 1-units (I-units - 10-5
×8Ω/U). On the other hand, when similar rolling was performed using a conventional rolling roll without heating means, the amount of shape change in the width direction of the rolled material was approximately 65.
It was confirmed that the rolling roll according to the example of the present invention could significantly reduce the change in shape of the rolled material and improve the shape accuracy.

In addition, as a second specific example, a heat generating conductive layer (3)
Therefore, as shown in Fig. 3, the roll is divided into three regions (a), (b), and (c) in the length direction, a central region (C) and two end regions (C). a)
(b) and the heating conductive layer portions (3a) (3
b) (3C) was formed. In addition, each conductive layer portion (3a) (3b) (3e) is
A conductive ceramic material of 70% 8Ω and 03-30% TiC was used as the material, and was formed by coating and firing in a predetermined pattern. The other configurations were the same as in the first embodiment.

Then, using this rolling roll, the amount of heat generated in the heat generating conductive layer (3) is adjusted to the central section area (c) by controlling the 4 currents.
When the same rolling test as described above was performed while controlling the both end section area portions (a) and (b) to be smaller, the change in the shape in the width direction was approximately 18 1-units, compared to the conventional This was a significant reduction compared to approximately 651 units when using rolling rolls.

Effects of the Invention Since the rolling roll according to the present invention has the heating conductive layer itself, the heat crown during rolling can be arbitrarily designed in advance. Therefore, it is possible to correct the heat crown caused by the heat generated during rolling, reduce the variation in elongation that occurs in the rolled material, and obtain a cold-pressed material with excellent shape accuracy. Therefore, especially in the production of thin foil, it is possible to prevent foil cutting troubles due to poor shape, and it is also possible to easily control the shape during rolling to improve shape accuracy, thereby improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a cold rolling roll according to the present invention, FIG. 2 is an explanatory diagram showing the formation pattern of the heat-generating conductive layer according to the first embodiment in a developed state, and FIG. 3 is a diagram showing the heat-generating conductive layer according to the second embodiment. It is an explanatory view showing a shape pattern of a layer in a developed state. (1)... Roll body, (2)... First insulating layer, (
3)...Heating conductive layer, (4)...'! J2 insulation layer,
(5)... Electrode, (6)... Brush, (8)...
Rolled material. that's all

Claims (2)

[Claims] (1) A heat-generating conductive layer is provided on the outer peripheral surface of the roll body in an insulating coating state, and the heat crown of the roll can be varied by applying electricity to the heat-generating conductive layer through an electrode provided on a part of the layer to generate heat. A cold rolling roll characterized by being configured in a freely configurable manner. (2) the heat-generating conductive layer is divided into a plurality of divided regions having different amounts of heat generation in the length direction of the roll body;
The cold rolling roll according to claim 1, wherein the energization can be controlled for each of the divided regions.