JPH0818043B2 - Cold rolling method for metal foil - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for cold rolling a metal foil, and is one in which gaseous water is adhered to a material to be rolled and then cold rolling is performed. .

[Background technology and its problems]

Metal foil such as aluminum or aluminum alloy (hereinafter abbreviated as aluminum) has a wide range of uses, and further higher quality is desired as the uses expand.

Generally, the thickness of the cold-rolled metal foil becomes thinner as the rolling load increases, so that the rolling load may be increased to improve the rolling degree and the production efficiency. However, there has been a problem that so-called herringbone, which causes damage to the surface of the metal foil, tends to occur as the rolling load and rolling speed are increased. On the other hand, if the rolling load is lowered to make the herringbones light or non-existent, there is a problem that defective products are generated due to a new problem of roll slip.
Further, these problems of herringbone and roll slip can be reduced to some extent by using a rolling oil, but cannot be solved only by improving the rolling oil.

Thus, in the conventional cold rolling method of metal foil, various conditions such as the properties of the material to be rolled, the rolling degree, the rolling load, the rolling speed, the properties of the rolling oil, the rolling mill, the equipment specifications such as the material supply device are compared. Since it was done voluntarily and individually, it required skill and was poor in productivity. Furthermore, because the relative relationship of the above parameters regarding the presence or absence of herringbone is unknown, for example, a technique such as reducing or eliminating herringbone by varying specific parameters when the rolling load and rolling speed are constant. There was a strong demand for the establishment of technical guidelines.

[Object of the Invention]

INDUSTRIAL APPLICABILITY The present invention can suppress the generation of herringbone by adhering a uniform gaseous water, can enhance productivity with stable and high quality, and can cool the metal foil cold environment that can maintain a good environment of the entire apparatus. The purpose is to provide a rolling method.

[Means and Actions for Solving Problems]

The present invention focuses on the viewpoint that the above-mentioned conventional problems could not eliminate the cause of the occurrence of herringbone because the mutual relationship of each parameter is unknown, and the above-mentioned conditions,
A new method is applied separately from the parameters to solve the problem.

That is, the applicant has specified the above-mentioned conditions and parameters, and from many achievements that have been produced while changing only certain conditions, the occurrence of herringbone causes thermal problems during cold rolling, the material to be rolled and the rolling roll. It is assumed that it is caused by minute mechanical vibrations or chattering phenomenon between and, and it was solved by adding and adhering moisture to the surface of the material to be rolled before the rolling process in order to establish its cooling and smooth contact. Of. Therefore, in the cold rolling method for producing a metal foil from a material to be rolled through a rolling mill, the material to be rolled is a humidity control device equipped with a humidity sensor for detecting humidity, and the inside has a relative humidity of 70% or more. The object is achieved by a structure in which the material to be rolled is passed through a water addition region provided in a case controlled to have a considerable amount of gaseous water, and then the material to be rolled is rolled through the rolling mill.

Therefore, when the material to be rolled before it is supplied to the rolling mill is allowed to pass through the moisture addition area, vaporous water is deposited on the surface of the material to be rolled, and then cold rolling is performed, the occurrence of herringbone is significantly suppressed. can do.

Here, the present invention is based on an empirical rule based on a large number of metal foil manufacturing results as described above, and the technical and mathematical basis for suppressing generation of herringbone by passing through the water addition region is not always required. Although it has not been clarified, it is believed that this is due to the solution of the above-mentioned thermal problem and smoothing of contact.

〔Example〕

An embodiment of a cold-rolling method for metal foil according to the present invention will be described in detail with reference to the drawings showing a suitable apparatus for carrying out the method.

This embodiment is carried out by the cold rolling apparatus 10 shown in FIG.

The cold rolling apparatus 10 includes a four-stage reversible rolling mill 1 and front and rear of the rolling mill 1 in cooperation with the rolling mill 1 so that the front side tension of the rolled material 4 is 5 kg / mm ² and the rear side tension. Is 3 kg / mm ² and is composed of a feeding means 2 for the rolled material 4 and a winding means 3 for winding the metal foil 5.

Here, the rolled material 4 is made of pure aluminum H18 (JIS H4000) and is a thin strip-shaped long strip having a width of 55 mm and a thickness of 90 μm.
As the rolling oil, water-insoluble Daphne oil AL-35 (made by Idemitsu Kosan Co., Ltd.) is used.

By the way, the humidity adjusting device 20 is for maintaining the amount of water adhered to the non-rolled material 4 in the water addition region AR at a predetermined value, and includes the case 25 and the pair of nozzles 30, 30 attached to the case 25. And humidity controller 21.

The humidity control device 21 includes a spraying means 22 including an ultrasonic humidifier.
And a drive control means 23 for driving and controlling the spraying means 22 by comparing the set value of the humidity setter 24 with the detection value of the humidity sensor 26 for detecting the humidity in the case 25. Therefore, if the humidity is set by the humidity setter 24, the humidity in the case 25, that is, the moisture addition area AR can be adjusted according to the set value.

Now, in the above apparatus, cold rolling was performed under the following conditions.

1) Rolling speed 100m / min 2) Rolling load 5ton and 8ton switching 3) Humidity (relative humidity) 80% and 30% switching in the water addition area As a result, the results shown in Table 1 were obtained.

According to this, at a rolling speed of 100 m / min, the presence or absence of herringbone is clearly distinguished depending on the humidity level at least during a rolling load of 5 to 8 tons. It was confirmed that the metal foil becomes slightly thick under the rolling speed and rolling load. This can be understood as establishing smooth contact between the material to be rolled 4 and the rolls of the rolling mill 1 regarding the presence or absence of herringbone.

Therefore, based on the above example, the rolling speed is 110 m / m.
The value was changed to in and 90 m / min, but the presence or absence of herringbone did not change.

Therefore, it was confirmed that adding and adhering water to the material to be rolled 4 does not hinder increasing the rolling speed to control the surface condition of the metal foil, that is, the quality and the thickness of the metal foil. Furthermore, herringbone did not occur even when the humidity was changed from 80% to 100%. It was the same when the setting was changed from 80% to 70%. On the other hand, the humidity from 30% to 25
When tested as%, significant herringbone was generated. Further, when the humidity setting value was gradually increased from this state, the herringbone tended to become lighter along with this, but it was not possible to obtain a quality acceptable as a product up to about 65%.

Therefore, according to this embodiment, it is possible to provide an excellent cold-rolling method for a metal foil in which herringbone is not generated by adhering moisture to the material to be rolled 4 in the moisture addition region AR. Moreover, since the control of the metal foil thickness by the conventional basic load of rolling is not hindered, the degree of rolling is slightly reduced (1 μm) due to water adhesion.
The disadvantage is eliminated by increasing the rolling load and rolling speed. This is directly linked to the effect of increasing productivity by setting the rolling load and rolling speed.

Further, the moisture addition area AR is easy and economical because it has a simple structure in which the humidity inside the case 25 may be controlled. Further, since the high humidity is important and changes and fluctuations in the rolling load can be tolerated, there is an excellent effect that the present invention can be widely applied to the existing rolling mill 1.

Furthermore, since the moisture addition area AR may be placed in front of the rolling mill 1, it may be one that adjusts the humidity of the entire rolling chamber, and in short, the degree of freedom in designing the structure and size of the case and the like is extremely large. From this point as well, it is understood that implementation of the present cold working method is excellent in practicality. However, if the case 25 is provided, the environment of the operator and the entire apparatus can be maintained in good condition.

In the present invention, the case where water is adhered to the surface of the material to be rolled 4 while the material to be rolled 4 is present in an atmosphere of a certain humidity in this manner is referred to as adhesion of gaseous water or vaporous water.

According to the above-described embodiment, the humidity adjusting device 20, the ultrasonic humidifier, etc. are provided and passed through the rolling mill 1. In short, gaseous moisture is added to the material to be rolled 4 in the moisture addition area AR, The present invention can be carried out without limiting the types and the like because they may be attached. That is, it is sufficient to provide the moisture addition area AR in front of the rolling mill 1 for adding gaseous moisture having a relative humidity of 70% or more, which is unlikely to be in normal weather conditions, and pass the rolled material 4. It should be noted that, after the rolling mill 1, since there is no part involved in the generation of herringbone, whether or not to add similar water is a matter of choice.

Further, in the above embodiment, the material 4 to be rolled is made of aluminum material, but since water is added in addition to the rolling oil to promote thermal problems and smooth contact, it is suitable for metal foil manufacturing metal such as copper material. Widely applied.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY The present invention has an excellent effect that it is possible to suppress the generation of herringbone by adhering a uniform gaseous water, to improve productivity with stable and high quality, and to maintain the environment of the entire apparatus in a good condition .

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an apparatus used in an embodiment for carrying out the cold rolling method for a metal foil according to the present invention. 1 ... Rolling machine, 2 ... Sending means, 3 ... Winding means, 4 ...
Material to be rolled, 5 Metal foil, 10 Cold rolling equipment, 20
… Humidity control device, 22… Spraying means.

Claims (1)

[Claims] 1. A cold rolling method for producing a metal foil from a material to be rolled through a rolling mill, wherein the material to be rolled in the previous period is a humidity control device equipped with a humidity sensor for detecting humidity and the inside of the material is 70% or more relative. Cold rolling of a metal foil, characterized by passing through a water addition region provided in a case controlled to become gaseous water equivalent to humidity, and then rolling the rolled material through the rolling mill. Method.