Mill coolant system design
Pumps. Most often, electric centrifugal pumps are used to generate pressure because they are extremely rugged and require very little maintenance. Air pumps can be used when a variable fluid pressure is required with each different profile that is formed; however, these pumps require significant maintenance.
If you know the flow and pressure requirements, a pump can be specified using manufacturer performance charts and a little intuition. Specification of an electric centrifugal pump requires choosing model type, motor size and speed, and impeller diameter. Plumbing inlets and outlets typically are intrinsic to each model size. Be sure you do not underspecify, because a pump always can be throttled down but never can be forced to supply higher flow.
Removal of Contaminants
More effective coolant systems include components that remove harmful contamination. Specifying these components requires that you first define the specific contaminants that need to be removed; you then must assess their frequency and quantity.
This list likely will include a variety of factors that affect the coolant: diluting water, the metal being formed, other required inline chemicals, machine leakage, and operator error. Typical contaminants include metal oxides, coil coatings, machine grease, hydraulic oils, gear oils, metal slivers, metal fines, bacteria, fungi, salts, profile coatings, cutoff oils, roll cleaning solutions, machine fasteners, repair tools, and other solids and liquids.
Contaminants typically are categorized as soluble and insoluble in coolant solution.
