Abstract:
Grinding process is characterized mainly by high specific energy
requirement due to large negative rake and high cutting speed, which results in
very high temperature. Such high temperature oftell leads to several problems
like a large heat affected zone, challge in hardness and microstructure of the
work piece, burning and its consequences and micro cracks. Application of
conventional flUids reduced the above problems to some extent through cooling
and lubrication of the grinding zOlle. On the other hand, the cOlwenlionai culling
fluids utilized in grindll1g are considered a problem for manufacturers, since
these substances can seriously damage human health and environment
Hence environmentally friendly production techniques like Minimum
Quantity Lubrication technique have become the focus of attention of
researchers and technicians In the field of machining and grinding as an
alternative to traditional fluids. In thiS technique, uses of cutting fluids of only a
minute amount-tYPically of a flow rate 50 to 500 mllhour. The concept of
minimum quantity lubncatlon some time referred to as near dry machining, The
minimization of cutting flUids leads to economical benefits.
In the present research work, attempts have been made to develop a
minimum quantity lubricant delivery system to carry out grinding of different
grades of steels (AISI-1040, AISI-4320 and AISIA140 steel) on a surface
grinding machine by stalldard diamond coated grinding wheel at different
infeeds and ellvlronmellt cOllditions
The presellt minimum quaillity lubricallt delivery system enabled
reduction In average chip-tool Illterface temperature upto 20% depending UPOIl
cuttillg conditions alld evell such apparently small reductioll, unlike common
belief, enabled favourable challge in the chip-tool alld work-tool illteractions,
which helped in reduclllg frictloll, cutting force, bUilt-up edge formation, thermal
distortion of the work and wear of the grindillg wheel tool. MOL system with the
present technique has substalltially reduced flank wear alld hence is expected
to improve tool life, Surface finish significantly improved by millimum qualltity
lubricallt
