Sandvik Coromant Parting and grooving - users guide - Manual (Page 78)

76
Wear mechanism – Trouble shooting
Careful observations
To achieve best possible economy regarding tool life, workpiece quality and optimised cut-
ting data careful observations of the insert edge have to be made.
At low speed built-up edge (BUE) and chipping are the main problems, at high speeds plastic
deformation (PD), flank wear and crater wear are the problems.
Cause
Cutting edge temperature too •
low.
Unsuitable geometry or grade.
•
Solution
Increase cutting speed and/ •
or feed.
Choose a geometry with a
•
sharper edge. Preferably a
PVD coated grade.
When parting to centre and in stainless material it is almost impos-
sible to avoid BUE. It is important to minimise this phenomenon by
using the solutions above.
Cause
Too hard grade. •
Too weak geometry. •
Unstable conditions. •
Too high cutting data. •
Solution
Choose a softer grade. •
Choose a geometry for higher •
feed area.
Reduce overhang. Check cen-
•
tre height.
Reduce cutting data.
•
Chipping/breakage
Built-up edge (BUE)