Author
Abstract
In this study, orthogonal machining tests in dry turning method are performed on
(AISI 1045 St.), in order to examine the influences for the type and number of
coatings on surface roughness. The cutting tools used are (TiN, TiN/TiC, and
TiN/Al2O3/TiC); multiple layers coated cemented carbide inserts. The tests are
performed at five different cutting speeds (80, 112, 155, 220 and 300) m/min,
while the feed rates are kept to be (0.08, 0.11, 0.14, 0.16 and 0.2) mm/rev
respectively, at constant depth of cut and tool geometry. The results showed that
(TiN/TiC) coated cutting tools gave best results for surface finish compared with
TiN/Al2O3/TiC, TiN and uncoated tool, for all the selected machining conditions.
The experimental results showed that, when the cutting speed is increased from
(80-300)m/min and feed rate is reduced by (250%), the values of surface roughness
is decreased by: (20%) for uncoated tool insert ,(27%) for single coated layer insert
(TiN), (55%) for double coated layer insert (TiN/TiC) and (49%) for triple coated
layer insert (TiN/Al2O3/TiC).
Keywords
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