dc.description.abstract |
Machining hardened steels has become un important manufacturing process,
particularly in the automotive and bearing industries. Abrasive processes such as
grinding have typically been required to machine hardened steels, but advances in
machine tools and cl1tling materials have allowed hard turning on modem lathes to
become a realistic replacement for many grinding applications. There are many
advantages of hard turning, such as increased flexibility, decreased cycle times,
reductions in machine tool cost,.>,und elimination of environmentally hazardous cutting
fluids. Despite these advantages, implementation of hard turning remains relatively low,
primarily due to concerns about the quality of hard turned surfaces and a lack of
understanding about the wear behavior of cutting tools.
The effects of high pressure coolant on cutting performances in respect of chip
formation, cutting temperature, cutting forces and surfa<,;erouglmess have been studied
using carbide insert. The same experiments were earried out on the above under dry
condition in order to compare the results with those obtained under minimal clJtling
fluid condition.
The result indicated that the machining with high pressure coolant performed
much better than dry machining mainly due to substantial reduction in cutting
tcmperature enabling favorable chip-tool interaction. This also facilitated the reduction
in cutting forees and surface finish. |
en_US |