CA1201611A - Cold working lubrication for aluminum and its alloys - Google Patents

Abstract

The invention relates to a method for cold transformation of aluminum and its alloys, and more particularly to a method of cold rolling into strips. According to this method, aluminum or its alloy is pre-lubricated before rolling by deformation tools, with whole mineral or synthetic oils, modified or not by additives, and, during rolling, said tools (and possibly the aluminum or its pre-lubricated alloy) are lubricated with solutions or emulsions of oil in water. Pre-lubrication prevents the formation of many surface defects during cold rolling.

Description

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The subject of the present invention is a perfec-cold processing of aluminum and of its alloys, in particular an improvement in the technique for cold rolling into strips.
We know that the cold rolling of strips in aluminum has been made for many years with mineral or synthetic oil lubrication, additive or not, which simultaneously provides lubrication and product and tool cooling (cylinders).
This oil is generally kerosene. However, in reason, on the one hand, for the limited performances thus obtained naked (speed, rate of work hardening, etc ...) and, of other apart from the danger of ignition and fire, we have place this oil in an essentially aqueous medium consists of an emulsion or an oil solution in water containing up to about 30% (in poias) of oil.
This method, leading to performance safely, is limited by the appearance of surface defects which appear, either in the form of longitudinal strips ~ parallel to the rolling direction), of different aspects called ~ one of different mattness (zmd), either in the form of local faults (halos, discontinuous faults known as aflame) ches), either in the form of azones of different roughness (zrd).
The Applicant has found it possible ~ `
to eliminate such defects when the transformation has cold is carried out on a pre-lubricated product, using a mineral or synthetic oil containing eventual-certain additives such as fatty acids, fatty alcohols, fatty esters, fatty amines or amides, organic products sulfur or phosphorous, wetting or anticorrosive products sion, fatty substances of organic origin such as tallow, etc.

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The present invention therefore relates to a method cold processing of aluminum or its alloys by means of deformation tools, characterized in that-before entering the said tools, the aluminum is pre-lubricated with a mineral and / or synthetic whole oil, said whole oil being non-additive or additive, and in that during said cold deformation, either deformation tools, so deformation tools and prelubricated aluminum ~ or its alloy pr ~ lubricates, are lubricated with water or a lubricant.
The pre-lubrication of the product before its transformation cold mation can result either from a specific operation, /
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either be the result of a previous operation, the product obtained not being degreased.
In the first case, this operation is performed, discontinuously or continuously, on the transformer line cold mation (or not) using any known device, such as spray bars (with or without air), electrostatic tif, oil-soaked wiper, etc ...
formality and regularity of the thickness of the layer of lubricant deposited, thus ~ ue its adhesion to the product, can be improved by known brush systems, felts, pinch rollers, etc.
The lubrication of the deormation operation cold can be ensured by whole oil (or mixture of oils), an emulsion or a solution of oil in water and even water alone.
With the pre-lubrication step ~ ication according to the invention, laminated strips can be obtained, free from defects superficial, from strips in the annealed (O) state or the hardened state (H) with reduction rates ranging from 50 to 90 ~ in a single pass and at rolling speeds ranging from 500 to 1000 m / min, for thicknesses generally included between 15 and 0.15 mm.
Although the exposition of the invention relates to cold strip rolling, the method also applies cold rolling other products such as bars, tubes, sheets, profiles, etc ... or other deformation mode to cold such as drawing or drawing.
The following examples illustrate the result obtained with the method according to the invention compared to art for rolling aluminum alloy strips (see table I).
In these examples, the pre-lubrication was ensured by depositing a mixture of mineral oil and oil synthetic (50 ~ - 50 ~ by weight) at a rate of a few ~ 20 ~ 6 ~

grams / m2 by sprinkling on the two aces of the strip and spinning by pinch rollers. The actual rolling was carried out on a quarto monocage rolling mill with lubricant cation by watering using a 10% aqueous emulsion by weight of oils:
ACRA 75 A ~ trademark), from FAREEST and ~ <2319 L 17 (commercial designation), from SHELL
These tests show that this method makes it possible to increase lie substantially about the productivity of the rolling mill while obtaining a very good surface area of the products laminated.

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Claims (5)

The achievements of the invention, about which them an exclusive property right or lien is claimed, are defined as follows: 1. Cold processing method for aluminum or its alloys by means of deformation tools, character-terrified in that before entering these tools, aluminum or its alloy is pre-lubricated with an oil whole mineral and / or synthetic, said whole oil being non-additive or additive, and in that during said cold deformation, ie the deformation tools, either deformation tools and pre-lubricated aluminum or its pre-lubricated alloy, are lubricated with water or an aqueous lubricant. 2. Method according to claim 1, characterized in that the pre-lubrication of the product results from the lubrication obtained during an earlier stage of the manufacture of aluminum or its alloy. 3. Method according to claim 1, characterized in that during the cold deformation, either the tools deformation tools, i.e. deformation tools and aluminum pre-lubricated nium or its pre-lubricated alloy, are lubricated with an oil-in-water emulsion, said emulsion being non-additive or additive. 4. Method according to claim 1, characterized in that during the cold deformation, either the deformation, i.e. deformation tools and aluminum pre-lubricated or its pre-lubricated alloy, are lubricated with an oil-in-water solution, said solution being non-additive or additive. 5. Method according to claim 1, 3 or 4, charac-that the lubricant used for pre-lubricating fication consists of a mineral or synthetic oil additive of one or more products chosen from the group consisting of fatty acids, fatty alcohols, fatty esters, fatty amines or amides, products organic sulfur or phosphorous, wetting products or anti-corrosion and organic orginal fats.