Determination of machinability of different work materials and influence of the properties of work materials on machinability

Abstract

The main factor influencing machining as well as the production cost is tool life. Cutting speeds have relatively large effects upon wear rate and, thsrefore, on tool life. But in practice, cutting speeds are determined ei'ther by mere experience as usually done by machine tool operators or selected from available engineering tables. In both the cases, the assigned values are, generally, too far away from the economic values. This thesis presents a scientific method of predicting terms of cutting speed for turning operatiollS mild steel, annealed steel and normalised the machinability in ,;.yof Aluminium, bra~~, Stee 1 with cem"ented carbide tool material. Experiments have been done to find tHe influence 01 the properties of work materials on machinability. It has been establ i shed "Lhat machi nabi 1i ty is inverse 1y proportional to hardness and strength of materials and these relationships can be used to determine the machinability of any other materials.