AT236019B - Lubricant for rolling non-ferrous metals - Google Patents

Description

  

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  Lubricant for rolling non-ferrous metals
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 Male washes are difficult to remove. Compound mineral oils of the type previously used cause even greater discoloration and staining of the non-ferrous metal during the
Rolling process than the non-compound mineral oils. The compound oils containing fats and fatty oils, such as sebum, bacon and oils from them, are still unsuitable because of the difficulties.
5 stig that occur when washing the rolled workpieces.



   The object of the invention is therefore to apply such a lubricant in a dual process for rolling non-ferrous metals which does not cause discoloration or staining of the rolled metals and whose lubricating properties are such that it can be used in small amounts so that A thin film of oil remains on the rolled metal sheets, eliminating the need to wash with solvents, which is dependent on coincidences.



   The object of the invention is achieved through the use of a mixture which has a predominant
Part of a non-emulsifiable, essentially aromatic-free mineral oil and a subordinate one
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 a method for rolling non-ferrous metals using a coolant and a lubricant.



  The non-emulsifiable mineral oil, which is free from aromatics, can be a mineral oil highly refined with phenol or furfural with a boiling point of 175 to 3450C and an SSU viscosity at 37.8C of 40 to 100.



   A particularly suitable base oil is an essentially non-aromatic mineral oil with an SSU
Viscosity from 40 to 80 at 37.8 C.



  20-40% by weight, preferably 25-30% by weight, of an unsaturated fatty acid such as oleic acid, linoleic acid, linolenic acid, erucic acid, ricinoleic acid and mixtures thereof can be added to the base oil.



   If necessary, 0.05-1% by weight or more, preferably 0.1-0.5% by weight, of fine oil-soluble trialkyl monophenol or bisphenol can be added to the aforementioned lubricant mixture.
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 groups in the 2,4 or 2,6 position are preferably used, for example 2,4-di-tert. butyl- - 6-methyl-phenol and 2,6-di-tert. butyl-4-methyl-phenol.



  35 Lubricating mixtures that can be used according to the invention are, for. B. the following: 1 "mineral oil (40 SSU at 37.8 C) + 30% oleic acid II - mineral oil (40 SSU at 37.8 C) + 30% oleic acid + 0.1% 2, 6-di-tert. Butyl- 4-methyl-phenol 40 m - mineral oil (40 SSU at 37. 80C) + 30% oleic acid +
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    1% bis (2-hydroxy-3, 5-di-tert-butyl-phenyl) methane IV - mineral oil (45 SSU at 37th SoC; spray base oil) +
30% oleic acid.



   The mineral oil mixture is applied to the surfaces of the machining rolls by wiping, spraying or brushing immediately before the entry of the strips of non-ferrous metal to be rolled or onto the surface of the non-ferrous metal itself immediately before it is cold-rolled, by brushing or spraying or other suitable measures are applied. In the last-mentioned case, enough time must be allowed for the lubricant to spread evenly over the metal surface.



  50 The coolant, which can be water or an emulsion, is applied separately. It is applied to the front and rear ends of the rollers so that the coolant is flushed over them before the coating of non-emulsifiable lubricating oil is applied or before the

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 non-emulsifiable mineral oil coated workpiece is passed through the rollers and reduced to the desired dimensions.

   Oil-in-water emulsions are particularly useful coolants.
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   ser emulsions, which sulfonates and common rust inhibitors. such as alkanolamines, are cheap and useful coolants for use in the dual process according to the invention. Oil-in-water emulsion coolants, which are particularly useful, consist of an oil concentrate (X) containing minor amounts (18-20% total) of sulfonate and triethanolamine in a light mineral oil base, with the sulfonate predominating and the triethanolamine is present in an amount of 0.1 to 1%. This. Oil concentrate is an excellent and cheap coolant (Y).



   When the rolling process is carried out, the lubricant (e.g. mixture I or II) is applied to the front of the work rolls or to the aluminum surface to be rolled before it passes through the rolls, and the like. between either by wiping. -Brush or spray. When the metal, which is evenly coated with the lubricant, is passed between the rollers, the coolant, which is water or preferably an emulsion, such as a Y-type coolant, can be separately applied directly to the front, back and underside of the work rolls are applied so that they are flooded and a maximum of cooling effect is achieved.

   The oil mixture, which has a strong surface-active effect, wets the rollers preferentially in comparison to the emulsion coolant. This can be prevented by suitable attachment of baffle plates from coming into contact with the rollers at the same point where the lubricating oil is applied.



   The lubricant used according to the invention prevents when used in the described
In this way, metal is picked up by the rollers, it facilitates correct grip of the rollers, it prevents sliding and results in an excellent surface finish with greatly reduced energy consumption. Aluminum that has been treated according to the dual process according to the invention can be used without additional treatment, such as washing, and without producing stains or discoloration of the
Aluminum surfaces are remunerated.



   The dual process for rolling aluminum was used in an aluminum factory for cold rolling aluminum on a Schmitz roll mill. The surface of the aluminum was coated with the mineral oil mixture IV at room temperature before the workpiece was inserted into the roller and as soon as the evenly coated aluminum surface ran through the rollers, the rollers were cooled with a 7% oil-in-water emulsion coolant (Y ) flooded.

   The thickness of the workpiece was reduced by 35%, with an energy of 43 amps. was required; there was no detachment of metal or no damage to the rollers and the surface was free of stains and in excellent condition
Condition, When using the dual process for cold rolling aluminum, as described above, and when using mineral oil mixture 1I as lubricant and water as coolant, there was a reduction in thickness of 44 to 60% with a power consumption of 43 to 115 amps .. without absorbing metal , Staining or other undesirable effects.

   When attempting to use the oil blends I-IV alone or water or an emulsion of the coolant Y type or another suitable emulsion as both a lubricant and a coolant for cold rolling aluminum, metal uptake by the rolls resulted in scoring. Spotting on the surface and the like Like. The dual process according to the invention can be used with the same advantage for hot rolling aluminum or for drawing non-ferrous metals.



    PATENT CLAIMS:
1. Use of a mixture which contains a predominant proportion of a non-emulsifiable, essentially aromatic-free mineral oil and a minor proportion of an unsaturated C, fatty acid, as a lubricant for a process for rolling non-ferrous metals using a coolant and a lubricant separately.



   2. Use of a mixture in which the mineral oil has an SSU viscosity of 40 to 100, preferably 40 to 80, at 37.80C. for the purpose of claim 1.

 

Claims (1)

3. Use of a mixture in which the fatty acid is present in an amount of 10 to 40% by weight, preferably 25 to 30% by weight, based on the mixture, for the purpose of claim 1. 4. Use of a mixture which contains oleic acid as unsaturated fatty acid for the purpose of claim 1. <Desc / Clms Page number 4> 5. Use of a mixture which additionally contains 0.05-1.0% of an oil-soluble trialkyl monophenol or bisphenol. for the purpose of claim 1. 6. Use of a mixture according to claim 5, in which the trialkylphenol contains two tertiary alkyl groups in the 2, 4- or 2,6-position, for the purpose according to claim 1.