Heat transfer performance assessment of abrasive phyllotaxy arrangement in internal cooling grinding

Abstract

The traditional flood cooling method is hard to dissipate the massive amount of heat accumulated in the grinding zone during the high-efficiency grinding process, which easily causes burnout of the workpiece that limits the increase of the processing efficiency. Employing an abrasive phyllotaxy arrangement and an internal cooling grinding wheel (ICGW) can augment the heat transfer of the coolant in the grinding zone to lower the grinding temperature. An abrasive phyllotaxy arrangement internal cooling grinding wheel that is a combination of an ICGW and abrasive phyllotaxy arrangement was proposed in this study. To optimize geometric dimensions and phyllotaxy coefficient of the abrasive phyllotaxy arrangement ICGW, simulation and experimental investigations were carried out to explore the effects of coolant (water-based ILs-MWCNTs/MoS2 hybrid nanofluids), grinding wheel diameters, and phyllotaxy growth coefficient on the heat transfer capability of the wheels. Within a specific range, the ICGWs with a smaller diameter and larger phyllotaxy growth coefficient show an advantage in fluid flow and heat transfer. Experimental results exhibit that, compared with the typical orderly arrangement, the grinding temperature and surface roughness of the ICGWs with the phyllotaxy pattern was reduced by about 20% and 50%, respectively. Under the same phyllotaxis coefficient, the grinding temperature and surface roughness obtained by the ICGWs with a smaller diameter were reduced by 10% and 22.3%, respectively. The residual compressive stress was elevated by 10.94%.