JPH0787926B2 - Metal foil rolling method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for rolling a metal foil from a metal material, and more particularly to rolling of a foil having relatively high hardness, such as stainless steel, iron and brass.

[Conventional technology]

Conventionally, foil rolling of a material having high hardness as described above is performed by multi-pass rolling. For example, stainless steel (SUS304)
It is common knowledge that 5 to 8 passes are required to roll a steel sheet from 150 μm to 60 μm in thickness. It is considered that this is because the performance of the rolling oil is limited, the material to be rolled is hard, and the performance of the rolling mill is also limited.

[Problems to be solved by the invention]

As described above, since the conventional foil rolling is a multi-pass rolling, there is a problem that not only the working time required for processing is long, but also the power required for processing is large.

An object of the present invention is to provide a metal foil rolling method that requires less work time and power for processing.

[Means for solving problems]

The present invention uses high-performance rolling oil and is not work hardened.
At the pass, the high-pressure reduction rate is taken, and the plastic working heat is used to complete the rolling with less power. Specifically, the rolling reduction is set to 55% or more to reduce the plastic working heat. As much as possible, the rolling speed is set so that the temperature at the rolling exit side of the material to be rolled is 150 ° C or higher, and a metal foil is prepared using a lubricating oil agent containing a polyvalent ester as a lubricant. Is a method of rolling.

Here, at a rolling speed such that the rolling reduction is less than 55% and the temperature of the material to be rolled on the rolling exit side is less than 150 ° C., sufficient plastic working heat is not generated and a normal foil cannot be obtained.

The polyvalent ester used in the present invention is not particularly limited, but preferably has a total carbon number of 14 to 18, for example,
A diester of a long-chain dibasic acid and a linear aliphatic alcohol described in Japanese Patent Application No. 61-44244, filed by the present applicant,
As described in U.S. Pat.No. 3,396,111, diesters of unsaturated dibasic acids having a lower carbon number such as dilauryl maleate and distearyl maleate with higher fatty acids, and described in JP-B-46-35624. As described above, (a) an esterified product of a branched polycarboxylic acid and 9- or 10-carboxystearyl alcohol or an aliphatic alcohol having 1 to 22 carbon atoms, (b) a branched polycarboxylic acid and a polycarboxylic acid Esterification products with polyhydric alcohols, aromatic polybasic acids such as aromatic dibasic acids or tribasic acids, or polyhydric esters of linear saturated aliphatic dibasic acids with aliphatic alcohols, dimer acids, trimer acids, etc. There are polyhydric esters with aliphatic alcohols, polyhydric alcohols with polyhydric alcohols such as briserine, trimethylolpropane and pentaerythritol, and fatty acids.

The lubricating oil containing the diester of Japanese Patent Application No. 61-44244,
More specifically, it is as follows.

That is, (a) the base oil contains 12 to 28 carbon atoms having a branched chain.
0.5 to 30% by weight of a diester which is a reaction product of an aliphatic dicarboxylic acid of 1 to 6 and a linear aliphatic alcohol having 1 to 6 carbon atoms
And a reaction product of a branched chain aliphatic dicarboxylic acid having 12 to 28 carbon atoms and a linear aliphatic alcohol having 1 to 6 carbon atoms in a base oil (b). 0.5 to 30% by weight of Dierter and 0.5 to 40% by weight of a monoester having 13 to 48 carbon atoms are lubricating oils for metalworking. Specifically, mineral oil and / or synthetic oil is used as the base oil in these lubricating oils. More specifically, examples of mineral oils include naphthenic mineral oils, intermediate mineral oils, lubricating oil fractions of paraffinic mineral oils, and highly aromatic components obtained by decomposing these mineral oils, and long-chain alkylbenzenes as synthetic oils. Examples thereof include branched chain alkylbenzenes, polyolefin oils such as polybutene, alkylnaphthalene, ester oils and polyglycol oils. Among these, mineral oil having a kinematic viscosity at 40 ° C. of 1 to 30 centistokes (cst), particularly about 5 to 20 cst is preferable.

Further, the aliphatic dicarboxylic acid having a branched chain and having 12 to 28 carbon atoms is specifically represented by the following general formula: It is represented by. In this general formula (1), l
Is 0 to 3, m and n are 1 to 23, respectively, and m + n
The total number of +1 is 8 to 24. The branched chain aliphatic dicarboxylic acid represented by the general formula (1) has 12 to 2 carbon atoms.
8, preferably 14 to 24, more preferably 16 to 20.
If the carbon number is less than 12, the heat scratch resistance is deteriorated, which is not preferable. On the other hand, the carbon number is 28
If it exceeds the range, the solubility is deteriorated particularly when a low-viscosity base oil is used, which is not preferable. Further, it is necessary to use an aliphatic dicarboxylic acid having a branched chain, and as the aliphatic dicarboxylic acid, there are saturated and unsaturated ones, but it is particularly preferable to use a saturated aliphatic dicarboxylic acid. Where linear saturated aliphatic dicarboxylic acid,
If a linear unsaturated aliphatic dicarboxylic acid is used, the solubility is poor and the desired lubricating oil cannot be obtained.

Specifically, the branched chain aliphatic dicarboxylic acid represented by the general formula (1) has 20 carbon atoms. Carbon number 16 Carbon number 12 Etc. can be illustrated.

As the linear aliphatic alcohol, one having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms is used.

Here, it is not preferable to use a branched one as the aliphatic alcohol because the heat scratch resistance becomes poor. Further, if the carbon number exceeds 6, the solubility is lowered, which is not preferable. Specifically, CH ₃ OH Such straight chain fatty _{alcohols, C 2 H 5 OH, n} -C 3 H 7 O
H, and n-C ₄ H ₉ OH, etc. can be exemplified.

The diester obtained by reacting a saturated or unsaturated C12-C28 aliphatic dicarboxylic acid having a branched chain as described above with a C1-C6 straight-chain aliphatic alcohol is the above-mentioned base oil. Is added in an amount of 0.5 to 30% by weight, preferably 1 to 20% by weight, more preferably 3 to 15% by weight.
If the blending ratio of dielter is less than 0.5% by weight, the desired lubricating oil cannot be obtained. Further, even if the amount is more than 30% by weight, the improvement effect commensurate with the amount of the compound cannot be obtained.

Furthermore, in the lubricant used in the present invention, a monoester having 13 to 48 carbon atoms can be used together with the polyvalent ester. When this monoester is used together with the polyvalent ester, the heat scratch resistance is further improved, the rolling load can be reduced, and the glossiness can be improved as compared with the case where the polyvalent ester is used alone. Moreover, by using the monoester together, it is possible to reduce the amount of the polyvalent ester used.

Here, the monoester is specifically represented by the general formula RCOOR '. In this formula, R has 12 to 12 carbon atoms.
22 represents an alkyl group, and R'represents an alkyl group having 1 to 26 carbon atoms. As the monoester, those having 13 to 48 carbon atoms can be used, but those having 13 to 36 carbon atoms are preferable. The monoester is preferably C ₁₇ H ₃₅ COOCH ₃ (methyl stearate), C ₁₇ H ₃₅ COOC ₄ H ₉
(Butyl stearate), C ₁₇ H ₃₅ COOC ₈ H ₁₇ (octyl stearate), C ₁₅ H ₃₁ COOC ₈ H ₁₇ (octyl palmitate), etc. are particularly excellent in gloss and are also easily available. However, it is preferable to use butyl stearate.

The monoester is 0.5 to 40% by weight, preferably 3 to 30%
It is added to the base oil in an amount of 5% by weight, more preferably 5 to 20% by weight.

The above various lubricating oils for metalworking used in the present invention are composed of the above components, but if necessary, auxiliary agents such as a viscosity index improver, a corrosion inhibitor, an emulsifier, an antioxidant and a rust preventive agent. Ingredients can be added as appropriate.

〔Example〕

 Next, the present invention will be described with reference to examples.

(Experiment 1) Using a rolling mill and a material to be rolled shown below, three kinds of lubricating oil materials specified in the present invention, and a normal lubricating oil material as a comparative example were used to perform one-pass rolling at a high pressure reduction rate. Then, the quality of the product was visually judged. The results are shown in Table-1.

1. Rolling machine Reversible 4-high cold rolling mill (manufactured by No. 2 Yoshida Memorial Iron Works), backup roll: 135φ mm × 200 ^W mm, Rmax 1.0 μm, work roll: 40 φ mm × 200 ^W mm, Rmax 0.2 μm, work roll Crown amount 0.07mm 2. Rolled material Stainless steel (SUS304) annealed material Plate thickness 0.15mm, width 70mm, length about 300m 3. Rolling oil Mineral oil (kinematic viscosity @ 40 ℃, 7.0cst) with the following additives 7
Oil seed.

Long-chain dibasic acid dimethyl ester having 20 carbon atoms 15% Long-chain dibasic acid dimethyl ester having 20 carbon atoms 5% and butyl stearate 20% Pentaerythritol trioleyl ester 20% Dimer acid dioctyl ester 20% Diisodecyl adipate 15% Tri 2-Ethylhexyl meritate 15% Butyl stearate 15% (For comparative experiment) 4. Rolling mill operating conditions 1 pass rolling, rolling speed 100m / min, said tension 100Kgf, backward tension 200Kgf, work roll crown amount 0.07mm As can be seen from Table-1, in the examples of the present invention, a normal foil can be rolled with a small rolling load, and since the rolling is performed in one pass, the working time can be shortened.

(Experiment 2) While using the same rolling mill and rolling material as in Experiment 1, the operating conditions of the rolling mill were changed, and it was confirmed whether there was a quality difference due to the difference in the lubricant. In this experiment 2, four-pass rolling was performed, the rolling speed was set to 100 m / min, and a rolling fluid similar to that in Example 2 in Experiment 1 was used and a rolling fluid similar to that in Comparative Example was used. The results are shown in Table-2 and Table-3, respectively.

As can be seen from Tables 2 and 3, there was almost no difference between the oil solutions in the 4-pass rolling, and in all cases, a large rolling load was required after the 3-pass rolling, and naturally, a long working time was required.
This is because the material to be rolled is work hardened by repeated rolling,
It is considered that the rolling load after the second pass was increased and the rolling reduction was reduced once.

Therefore, according to the present invention, good results can be obtained by the synergistic effect of using a lubricant containing a polybasic acid ester having high lubricating performance and obtaining a sufficiently large reduction in one rolling. Is.

〔The invention's effect〕

According to the present invention, there is an effect that a working time required for processing is short and a required power is small.

Claims (3)

[Claims] 1. A rolling reduction is set to 55% or more, a rolling speed is set to a temperature at which a rolling outlet side of a material to be rolled is 150 ° C. or more, and a polyvalent ester is contained as a lubricant. A method for rolling a metal foil, which comprises producing a metal foil from a metal material using a lubricant. 2. The method for rolling a metal foil according to claim 1, wherein the polyvalent ester is a diester of a long-chain dibasic acid and a straight-chain aliphatic alcohol. 3. The long chain dibasic acid according to claim 2, is an aliphatic dicarboxylic acid having 12 to 28 carbon atoms, and the straight chain aliphatic alcohol has 1 to 6 carbon atoms, and These reaction products, diesters, are added to the base oil at 0.5 to 30%.
A metal foil rolling method, wherein the metal foil is blended in a weight percentage.