Sandvik Coromant Parting and grooving - users guide - Manual (Page 35)

33
B A
Axial turning – surface finish
Due to the wiper effect achieved in axial turning with CoroCut it is possible to generate a
high quality surface finish. Ra value below 0.5 can be generated, and also high bearing ratio is
achieved resulting in the elimination of a grinding operation.
Comparison between CoroCut
(A) and conventional turning
tools (B). For comparison of
surface finish achieved, see
the following graph.
Surface finish comparison
Depth of cut/feed rate
When high feeds are used in conjunction with low depth of cut (DOC), or low feeds with
high DOC, sufficient deflection of the tool will occur to give clearance for the front cutting
edge.
However, where low feeds and low DOC are combined the axial forces may be insufficient
to give clearance. This may cause rubbing and hence vibration.
Solutions
1) If possible raise DOC or feed rate.
2) Use TF geometry with a concave cutting edge which will limit contact.
3) By changing to a holder with longer Ar , will affect the result.
Surface finish,
Ra µm
Feed, mm/r
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.1 0.15 0.2 0.25 0.3
TNMG 160404
TNMG 160408
CoroCut – 5 mm RM
CoroCut – 4 mm TF
CoroCut – 6 mm TM