INFLUENCE OF CUTTING PARAMETERS ON SURFACE ROUGHNESS OF AS-CAST AND RRA TREATED AA7075 - A COMPARATIVE STUDY

Abundantly available aluminium is being used in various applications such as air craft, automotive industry etc. due to its high specific strength and good corrosion resistance. To achieve desired results, knowledge of the manufacturing process employed and behavior of metal under various working conditions are utmost important. Several engineering applications such as fly motors, airframes, space transports, hypersonic rockets and remote ocean submersibles, and so forth demands materials with tailored set of properties that can't be obtained by employing the ordinary solid materials. There is a need for lightweight materials which exhibit high strength, stiffness and high wear resistance which are primarily required in structural, aerospace and automotive industries. In present work a sincere attempt has been made to study some of the important properties of heat treatable AA7075 aluminium alloy subjected to an heat treatment procedure known as Retrogression and Re-ageing (RRA) to achieve property enhancement. For obtaining better combination of properties some of the parameters such as ageing time, solutionization temperature, ageing temperature, retrogression temperature and retrogression time are chosen meticulously. Machining studies were conducted on as-cast and RRA treated samples.The influence of cutting parameters on the surface roughness is studied. The optimum cutting parameters are evaluated through Taguchi DoE