US2303141A - Lubricating mixture for cold reducing mills - Google Patents

Description

Patented Nov. 24, 1942 um'rao STATES PATENT OFFICE atta n LUBRIOA'HNG mxrun aanuom a m: com G mus A m1 1). 8mm, Gary, Ind.

No Drawing.

Application August 15, 1939, Serial No. 290,312 1 cam 01. 80-60) The present invention relates in general to improvements in the art of cold reducing metals such as exemplified in the patent granted to Edwin T. Lorig, Patent No. 1,973,684, issued September 11,-193'4', In the said Lorig patent, there disclosed a process for cold reducing metal,

especially in rolling thin,.wide strips of steel on as4-high mill, the patent disclosing the broad pointed out in detail in the following specification and in the subioined claims.

In accordance with the present invention. in-

water and engine oil, I utilize; as a combined lubricant and coolant, a. mixture of. palm oil and water which is preferably emulsified so that the mixture does not break down during the roll-' ing operation. The present invention overcomes problems due to the entry mineral oil into lubricant and coolant, this mineral oil coming from leakage of the mill lubricating system and also being carried by the material being rolled, which material is frequently coated with mineral oil for the prevention of rust or corrosion,

In practice it was found that the addition of mineral oil was detrimental as it did not readily jenter into suspension with other oils, thusthe mixture became unduly thick, clogging the filter screens and other parts of the spraying'systeml In my research, to overcome the diflieulties inherent in the use of solutions employing mineral oil, engine oil and the like, I discovered that by utilizing a mixture of palm oil and water totallyunexpected'and surprising results were secured without the disadvantage ofclogsing thecirculating system; even when the pahn oil and water In practice the solution or liquid mixture is sprayed through nozzles against the surface of the working rolls and on the surface of the strip being rolled, pressure being applied by centrifugal or other pumps driven by variable speed motors. The solution, as itdrips from the rolls and the work, is collected in a sump wherein the temperature is controlled vas desired by a suitable heat exchanger, the solution or mixture bestead of applying water alone, or a mixture of ing pumped from the sump into the circulating system, sprayed on the'rolls and surface of the strip being reduced, and the excess mixture being returned again to the sump. Practice has shown that under my invention, by utilizing a solution of palm oil and water, the following advantages accrue: The cost of the solution is reduced by approximately 95%; the individual mill loads are appreciably lowered; a definite roll contour can be maintained; the mill can be operated under a uniform screw pressure, regardless of I the degree of hardness of the metal being reduced, by controlling the oil content of the rolling solution; a more desirable strip shape is obtained due to the fact that the reducing members are cooled and lubricated as desired; materialre- [duced in the improved solution is more easily cleaned preparatory to annealing; due to the uniform pressures exerted on the working members, it is possible-to maintain a materially better surface condition of the working rolls, thus prolonging their life; the material is more accurately rolled to the desired ga e; strip breakage such as heretofore caused by non-uniformity of mixture became somewhat contaminated with the lubricating oil or other mineral oil.

I have determined that for most efllcient resuits, the combined lubricant and coolant should 125 degreesl 'ahrenheit.

:contain from 1 to 40 per centpalmoil and from 60 to 99 pe'r cent water.

mixture does not attain a temperature below '40 degrees orabove 212 degreesFahrenheiuI find that for most efiective results, it is desirable to Whileanymixture within this range will give good results when the employ a' mixture comprising approximately-.15 4

per cent palm oil with the remaining per cent water. ,The optimum temperature is approxi- 1 solution is practically eliminated, and the enter- :ing of the strip into the mill is expedited because reduction thereof at the point of entry is more nearly uniform.

In practice, the ingredients of the solution may be emulsified by the use of, eithera mechanical homogenizer or a chemical emulsifien' The emulsification can be obtained by mechanical agitation-elther in the nature of a separate agitating step, or the constant interaction of the rolls of the mill with the workcan be utilized for homogenization of the ingredients of the mixture.

Having thus described the invention and the advantageous features which distinguish it from the prior art, what I claim is:

1. The method. of cold reducing metals which consists in lubricating and controlling the tem-- .-perature of the reducing members by applying to the exterior working surface thereof a liquid mixture consisting solely of a homogenizedemulsion of palm oil and water.

66 2. The method of cold reducing metals which consists in lubricating and controlling the temperature of the reducing members by applying to the exteriorworking surface thereof a liquid mixture consisting solely of a mixture of from 1 to 40 per cent palm oil and the balance water to make 100 per cent.

3. The method of claim 2 further characterized in that the liquid is applied at a temperature of approximately 125 degrees Fahrenheit.

4. A solution for controlling the temperature of reducing members of a cold metal reduction apparatus' and for lubricating the metal being reduced, consisting solely of a mixture of from 1 to 10 to make 100 per cent.

EARL D. SPANGLER.