JPH01197004A - Manufacture of metallic foil - Google Patents

Abstract

PURPOSE:To improve the surface glossiness and shape quality of foil by performing a rolling for the final pass by specular-finished work rolls having a specified range of Young's modulus each. CONSTITUTION:When metallic foil is manufactured by continuous rolling, the rolling for the final pass is performed by specular-finished rolls having Young's modulus 31,000-54,000kgf/mm<2>. Since, in the specular-finished rolls, the surface roughness Ra and small e.g. 0.05-0.1mum and further, Young's modulus of the rolls is in a suitable range, the rolls are prevented from abrasion and the rolls secure a certain flattening. As a result, since the surface of each roll can keep a state of specular finish, the surface glossiness of the product metallic foil is improved. Moreover, since each roll has a suitable flatness, wrinkles are prevented from occurring at the edge of the foil. Consequently, the surface glossiness and shape quality of the foil are improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing metal foil.

The metal foil produced according to the present invention is used as electronic parts, heat-resistant materials, interior decoration materials, automobile materials, and other industrial materials. Note that the material of the foil is steel, copper, copper alloy, aluminum, aluminum alloy, or other metal. The thickness of the metal foil is approximately 5 to 150 IJm.

[Prior Art] Metal foils are required to have excellent surface gloss and good shape depending on their use.

The surface gloss of metal foil depends largely on the surface roughness of the work roll and rolling lubrication. Regarding the surface roughness of work rolls, it is known that mirror rolls are used for finish rolling. (For example, “Plasticity and Processing J VO
1, 21 no, 231 p 296/300).

Regarding rolling lubrication, it is known that the thicker the oil film during rolling, the lower the surface gloss. ("Plasticity and Processing J VOl, 8110.75 p 205/20
8). Further, during foil rolling, oil bits may be generated due to rolling oil in the roll bite, which may reduce the surface gloss. Therefore, proper selection of rolling oil is necessary to obtain good surface gloss.

In the case of metal foil, most shape defects are ear waves. Generally, the generation of ear waves is prevented by adjusting the tension, roll crown, or shift amount of the intermediate roll. Control of shape by adjustment of tension and roll crown is discussed, for example, in the document "Plasticity and Processing J VOl, 8 no.
, 75 p 205/208.

Furthermore, when the Young's modulus of the work roll is low, the roll is flattened, the contact arc length becomes large, and the rolling load increases.

Furthermore, as the sheet thickness becomes thinner, kiss rolls occur due to slack in the axial direction of the rolls, which limits the minimum thickness that the foil can be rolled. Therefore, when rolling ultra-thin metal sheets or metal foils, work rolls with a higher flattening ratio and a smaller diameter than those used in general cold rolling are used. Rolls with high Young's modulus include cemented carbide rolls and ceramic rolls. (For example, "Plasticity and Processing J VOl, 2no,
9 p 325/334 or “Plasticity and Processing J VO
1, 9no, 84 p20/29) [Problem to be solved by the invention] However, if the Young's modulus of the work roll is too high, the amount of roll flattening will be extremely small, so the rolling pressure on the side edge of the metal foil is higher than in the center. As a result, there is a problem in that ear waves occur.

Conversely, when the Young's modulus is low, as rolling progresses, roll wear increases and roll surface roughness also increases. Therefore, even if a mirror-finished work roll is used, the surface roughness of the rolled metal foil becomes rough, making it difficult to obtain good surface gloss.

Therefore, the present invention aims to provide a method for manufacturing metal foil that can obtain metal foil with excellent surface gloss and shape.

[Means for Solving the Problems] The method for manufacturing metal foil of the present invention is a method for manufacturing metal foil by continuous rolling in multiple passes, and the Young's modulus is 310.
00 to 54000 kgf/++un2, and the final pass of rolling is performed using mirror-finished work rolls.

Young's modulus is less than 31000 kgf/mm2,
It is difficult to roll an extremely thin metal plate or metal foil, especially rolling it to a thickness of 30 Aim or less, and furthermore, the surface gloss deteriorates.

Furthermore, when the Young's modulus exceeds 54000 kgf/nun2, ear waves are likely to occur. Young's modulus is 31000~5
As a work roll of 4000 kgf/mm2,
i [alloy, W (knee Go alloy, other cemented carbide rolls, ceramic rolls, etc. are used. Mirror finished work roll surface roughness Ra (JIS B-0
601) is about 0.05 μm to less than 0.1 μm. When a metal foil is rolled with a work roll having a surface roughness Ra of ◎ and IJJ11 or higher in the final pass, the surface gloss may decrease.

Note that the surface roughness Ra is 0 in passes upstream from the final pass.
．． It is desirable to roll with work rolls of 1 μm or more. In the pass upstream from the final pass, the surface roughness Ra is 0.
．． If the metal foil is rolled with a work roll of less than 174,111 mm, the metal foil may slide sideways, and stable rolling may not be possible. Also, all passes may be rolled with cemented carbide rolls, but depending on the rolling conditions, rolls made of art materials may be combined, such as using forged steel rolls in some passes and cemented carbide rolls in other passes. You may also do so.

[Function] Young's modulus of work roll is 3+000 kgf/mm"
Because of the above, the amount of roll flattening due to rolling load is small. Therefore, the contact arc length is shortened and roll wear is reduced. As a result, even when a long metal foil is continuously rolled, the roll surface maintains a mirror-like state, and a metal foil with excellent surface gloss can be obtained. Furthermore, since the deflection in the axial direction of the roll is small, the kiss roll load is small, and even an extremely thin metal foil of about 5 μI can be rolled. Note that when the Young's modulus is 31000 kgf/mm2 or more, mirror finishing of the work roll becomes easy. Furthermore, since the Young's modulus of the work roll is 54,000 kgf/mm2 or less, roll flattening occurs to some extent. This roll flattening alleviates the increase in rolling pressure at the side edges of the metal foil and prevents the occurrence of ear waves.

Note that the surface roughness Ra is 0.0 in the pass upstream from the final pass.
When it is 174111 or more, the coefficient of friction between the work roll and the metal foil becomes large, and local skidding of the metal foil is less likely to occur. Therefore, the surface roughness Ra is 0 in the final pass.
．． Even when rolled with a mirror finish roll of less than 17 Jm, the final product with a smooth surface is wound and unrolled by inserting intermediate paper, etc., so there is no side slipping of the metal foil.
Rolling can be performed stably. Furthermore, regardless of the surface roughness of the rolls in the intermediate buses, the surface roughness of the rolls in the final bus is almost transferred to the rolled metal foil. Therefore, if the final bath roll surface roughness is mirror-like, it is possible to obtain a product with excellent surface gloss.

[Example] A rustless steel plate was rolled into foil under the following conditions.

1) Sample 5IJS304 0. IOtx300wx
:r roll (mm) 2) Rolling mill 12-high rolling mill Roll size: Work roll diameter 35 x body length 420 (mm) Intermediate roll diameter 72 x body length 420 (tnm) Backup roll diameter 150 x body length 420 (mm) Roll surface finish: Mirror finish (For surface roughness, see Table 2) Roll material: See Table 2 3) Rolling conditions Reduction ratio: See Table 1 Rolling speed: 10 (m/m1n) 4) Finished dimensions 0, Q32t X 300wX :Film (mm) Table 2 shows the results of rolling stainless steel foil under the above conditions. The glossiness may be measured in accordance with JIS Z-8741 or as an average value in the C direction.

In Table 1 and Table 2, Example 1 is based on the conventional method,
Examples 2 to 5 are based on this invention. Example! In this case, the surface gloss of the metal foil at the start of rolling is 6.
Although it showed a good value of 50, the surface gloss level decreased to 410 after rolling the metal foil for 2100 m. In Examples 2 to 5, there was no decrease in surface glossiness, and no ear waves were generated.

[Effects of the Invention] According to the present invention, a metal foil having good surface gloss and shape can be stably rolled, and a metal foil of excellent quality can be provided.

Claims (1)

[Claims] In the method of manufacturing metal foil by continuous rolling of multiple passes, the Young's modulus is 31,000 to 54,000 kgf/mm^
2, a method for manufacturing metal foil, characterized in that the final pass of rolling is performed using mirror-finished work rolls.