Abstract
Abstract
The convection heat transfer coefficient of the coolant within the grinding zone has been estimated using hydrodynamic and thermal modelling. The convection coefficient within the grinding zone can be very high, much higher than the values previously reported. The value is determined by the grinding wheel speed and the fluid film thickness within the contact zone. The film thickness in turn can be determined by wheel speed, porosity, grain size, coolant type and flowrate, nozzle size, etc. For deep grinding conditions [creep feed and high-efficiency deep grinding (HEDG)], the upper bound value of fluid film thickness can be easily achieved by a high coolant supply pressure and flowrate. Predicted values of the convection coefficient from hydrodynamic and thermal modelling show good agreement with experimental estimations obtained by matching measured and theoretical grinding temperatures for a wide range of grinding regimes when using a water-based grinding fluid. This includes HEDG and creep feed grinding for large contact lengths and conventional shallow cut grinding for short contact lengths.
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