Sandvik Coromant Heat resistant super alloys - Manual (Page 84)

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CoroMill ® 390
Summary – end milling/90 degree approach in HRSA materials
Edging/circular interpolation of existing hole
• Grade S30T performs better at lower
immersion ratios.
• For grade S30T the geometry E-ML per-
forms better on average regardless of the
cutting conditions employed.
• a
e
= 12.5% of D
c
, f
z
0.11 mm (h
ex
0.07
mm)
Increased immersion/slotting/
circular ramping
• At higher immersion ratios grade S30T
E-ML has the best performance.
• a
e
= 50% of D
c
, f
z
0.1 mm (h
ex
0.1 mm)
Ceramic cutting tool properties have a
much higher resistance to heat compared
to carbide tools, making it an excellent
option for machining HRSA where high cut-
ting temperatures are present.
Ceramic milling typically runs at 20 to 30
times the speed of carbide, although at
lower feed rates, which results in high pro-
ductivity gains. They show a high tendency
to notching, which is why round inserts are
mainly used to ensure a low entering angle.
Ceramics have a negative effect on the
surface integrity and topography and are
therefore not used when machining close to
the finished component shape. Due to the lack of toughness of ceramic
material, round inserts are used to sup-
press the high notching tendency.
The main application for ceramic milling is
machining of engine casings and oil drilling
equipment due to the high metal removal
rates over carbide inserts, combined with
large stock removal.
Cutter programme – Please contact your
local Sandvik Coromant representative for
ordering.
Ceramic milling