INFLUENCE OF CUTTING PARAMETERS ON SURFACE QUALITY OF AL7075 ALLOY UNDER DRY AND LN2 COOLING CONDITIONS

Bogdan NIȚĂ, Carol SCHNAKOVSZKY, Eugen HERGHELEGIU, Bogdan CHIRITA, Raluca Ioana TAMPU, Catalin TAMPU

Abstract


The aim of the present paper was to investigate the influence of cutting parameter under dry and LN2 (liquid nitrogen cooling) cooling condition on surface quality. Experiments were conducted on the AL7075 aluminum alloy and three cutting speeds and two cutting depths were tested in the presence and the absence of the cryogenic cooling. The increase of cutting speeds under the cryogenic cooling conditions led to a decrease of surface roughness from 0.28 µm (in dry condition) to 0.16µm (with LN2 cooling). Similar behavior was observed in the case of the increase of the cutting depth, thus for higher cutting depths the use of cryogenic cooling liquid generated lower surface roughness values that the dry milling. In conclusion the use of the cryogenic cooling technique is recommended for AL7075 milling as it generated better results that the dry machining and it is also considered an environmentally friendly technique.

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