Abstract: A process for the cutting or non-cutting forming of metals using two cooling lubricants, wherein an oil or a first emulsion having an oil content of at least 10 wt. % is applied to the workpiece, as a first cooling lubricant, at the tribo-zone and, at the same time, an oil-free cooling lubricant or a second emulsion that is an oil-in-water emulsion having an oil content of less than 10 wt. % is applied, as a second cooling lubricant, adjacent to the tribo-zone. Depending on the metal-working technique, a two-component nozzle is preferably used for supplying the first and second cooling lubricants, the jet of second cooling lubricant surrounding the jet of first cooling lubricant concentrically. Alternatively, it is possible to supply the first cooling lubricant directly to the tribo-zone through channels in the tool, while the second cooling lubricant is applied at the periphery.

Abstract: A process for preparing a stable cooling lubricant emulsion for use in the cutting of metals involves the steps of (a) forming a mixture having an oil component, water and an emulsifier with the oil component being emulsified in the water, then (b) dispersing into 100 parts by weight of the mixture by means of high shear from about 1 to about 14 parts by weight of a natural, water-immiscible cutting oil. The stable oil-in-water cooling lubricant emulsion formed has at least 50 percent of the cutting oil present in the form of particles having a diameter of 0.5 to 8 &mgr;m. The cooling lubricant emulsion formed may be used in an extended range of applications.