Cutting temperature in machining is controlled through three mechanisms — cutting tool material/geometry selection, process-parameter (velocity, feed) optimization, and cutting fluid application — with cutting fluid serving four functions: cooling, lubrication, cleaning of the machining zone, and protection of the finished surface. Cutting fluid action depends on the contact-length theory at the chip-tool interface (the elastic versus plastic portion of contact governs whether lubrication is physically possible, since fluid can only penetrate the elastic contact zone and plastic contact dominates at high cutting velocity), and required fluid properties (spreading/wetting, heat-carrying capacity, lubricity, chemical stability, non-corrosiveness, low toxicity) plus fluid type (air blast, water, soluble oil, cutting oil, chemical/synthetic fluids, solid lubricants, cryogenic fluids) are selected according to work material, tool material, and machining speed regime. This belongs to the domain of manufacturing processes, specifically the mechanics of machining and thermal/tribological control at the tool-chip-workpiece interface.
Cutting temperature in machining is controlled through three mechanisms — cutting tool material/geometry selection, process-parameter (velocity, feed) optimization, and cutting fluid application — wi…