Metal deforming – With cleaning – descaling – or lubrication of work or product – Lubricating
Patent
1992-06-10
1994-02-01
Crane, Daniel C.
Metal deforming
With cleaning, descaling, or lubrication of work or product
Lubricating
72 41, B21B 4502
Patent
active
052823768
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the cold rolling of metal strip and, in particular, to the application of liquid lubricant to the upper and lower surfaces of the strip immediately prior to rolling in a rolling mill.
It is known to spray a mixture of oil and water on to the upper and lower surfaces of steel strip just before it enters the gap between a pair of rolls to reduce the thickness of the strip. The oil and water mixture, in the form of an emulsion, serves to lower the friction between the strip surfaces and the surface of the roll barrels. Heretofore it has been the practice to supply substantially the same amount of lubricant to each surface of the strip at several of the stands in a multistand cold rolling mill and also the mixture supplied at each stand has consisted of the same proportions of oil and water. It has been found that this is not an efficient practice and that both the quantity of emulsion supplied and the proportions of water and oil in the emulsion need to be different for various rolling conditions.
It is known from US-A-4315421 for an oil-in-water emulsion to be pumped from an emulsion mixing tank to upper and lower manifolds where it is sprayed on to opposite surfaces of the strip being rolled. The oil and the water are supplied separately to the mixing tank where they are mixed together to form the emulsion.
According to a first aspect of the present invention, in a method of lubricating metal strip being rolled in a rolling mill, rolling oil flowing at a predetermined rate and water flowing at a predetermined rate enter into an emulsifier to be subjected to turbulence to produce an emulsion which is applied to the opposite surfaces of the strip prior to the strip being rolled; characterised in that the flow of rolling oil is introduced into the flow of water to cause at least partial mixing thereof prior to the oil and water entering the emulsifier.
According to a second aspect of the invention, apparatus for lubricating metal strip being rolled in a rolling mill comprises means for supplying rolling oil flowing at a predetermined rate and water flowing at a predetermined rate to an emulsifier where they are emulsified; and spray headers for applying the emulsion to the opposite faces of the strip immediately prior to the strip being rolled, characterised in the provision of means for introducing the flow of rolling oil into the flow of water to cause at least partial mixing thereof before entering the emulsifier.
When the mill comprises a multistand cold rolling mill, some or all of the stands have provision for supplying an emulsion of rolling oil and water to the upper and lower surfaces of the strip material immediately prior to it entering the stand and, at each of these stands, the quantity of oil and the quantity of water are individually controlled prior to the oil and water being mixed together and subsequently applied to the strip material.
The quantity of oil and the quantity of water may be determined in advance of rolling and then these quantities remain fixed during rolling or the quantities may be varied during rolling if the rolling parameters, such as strip speed and mill load, change during rolling. By varying the ratio of water and oil at one or more of the stands of a multistand rolling mill the rolling load pattern of the mill can be changed. These changes may be brought about manually by a mill operator or they may be under computer control.
As a result of this invention, at each stand where emulsion is supplied, the quantity of emulsion supplied to the strip material can be varied to give optimum results and, furthermore, the proportions of water and oil making up the emulsion can be changed to give the required lubricity. This results in satisfactory surface properties of the rolled strip and avoids wasting expensive lubricating oil.
In order that the invention may be more readily understood, it will now be described, by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 shows diagrammatically an arrangement for mixing the oil
REFERENCES:
patent: 2310563 (1943-02-01), Wilke et al.
patent: 2401340 (1946-06-01), Dunmire et al.
patent: 3709012 (1973-01-01), Larsonneur
patent: 4315421 (1982-02-01), Wilson
patent: 5090225 (1992-02-01), Schimion
Pye Andrew M.
Steele Anthony A.
Crane Daniel C.
Davy McKee (Sheffield) Limited
McKeon Michael J.
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