EFFECTS OF CRYOGENIC COOLING ON BURR HEIGHT IN DRILLING OF CERAMIC REINFORCED ALUMINIUM MATRIX COMPOSITES

Sustainable manufacturing strategies comprising of low energy processes with minimum environmental pollution are being considered by various industries. The concept of sustainability has increasingly been evolved in modern times and has started to attract global attention. Metal matrix composites (MMCs) have potential to be used in different applications like automotive, aerospace and consumer goods, however, their machinability is still remaining a challenge. The effects of cryogenic liquid nitrogen on burr height compared with wet coolant in drilling of MMCs using PVD coated carbide tool has been undertaken. The influence of the two different cooling conditions on burr height was studied. The use of cryogenic cooling was found to reduce burr height at almost all combinations of speed and feed level, also the burr height was minimum at lower speed and feed rate.