Typical wear patterns in hrsa milling – Sandvik Coromant Heat resistant super alloys User Manual

Page 71

S30T

GC2040

GC1030

S40T

Flank wear

Rapid flank wear causing poor surface finish or out of tolerance.
Cause: Cutting speed too high or insufficient wear resistance.
Remedy: Reduce cutting speed.
Select a more wear resistant grade.
Cause: Chip thickness too low.
Remedy: Increase feed.

Notch wear

Notch wear causing poor surface finish and risk of insert breakage.
Cause: Work hardening materials.
Remedy: Select round insert/reduce a

The common causes of tool failure are excessive flank wear, notch-
ing at the cutting edge, and the inability to reach surface finish and
accuracy requirements. Other contributing factors include excessive
crater depth and destruction of the cutting edge by fracture. HRSA
also tend to work-harden making subsequent passes more prone
to notch wear.

Typical wear patterns in HRSA milling

PVD-TiAlN-coated carbide

grade for milling of heat

resistant super alloys at

medium speeds. Good

resistance to built-up

edge and plastic deforma-

tion.

Tough MT-CVD coated carbide for

milling of cast heat resistant alloys.

Good resistance to high tempera-

tures.

Complementary

First choice

Combination of micro-grain carbide

and a wear resistant PVD coating

enables very sharp cutting edges

that resist fatigue and micro-chip-

ping. Enables higher cutting speeds

and longer tool life.

Combination of high

toughness cemented car-

bide with a thin CVD coat-

ing resulting in a grade

that withstands vibration

and other difficult cutting

conditions. Enables longer

tool life and high security.