Turning Constraints of Aluminium Alloy 7075 using CNMG and VNMG Inserts.

Almost 80% of a viable & Army airframe is made of aluminium alloys. It is predictable that the usage of aluminium alloy is to upsurge up to 70% by the year 2025. They are mainly used because of their high strength to weight ratio. This project presents a study of the cutting tool performance of an CNMG Carbide & VNMG carbide tool in operation on Al 7075, in which the volume of material removed and surface roughness were investigated. The machining tests were conducted on a CNC lathe machine to obtain the MRR and surface roughness of the Aluminium Alloy 7075 work piece material. The average surface roughness (Ra) was measured using a Mitutoyo surface roughness tester. The effect of these cutting constraints on each of these variables was examined, as well as the possible interrelation between them. The experimental results showing that the mechanical effects, produced by the feed, should not be neglected against the thermal effects, produced by the cutting speed, within the range of the tested cutting speed.