Каталог Stellram токарный инструмент - страница 193

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Failure Analysis

Cause Correction Failure

A Use a heat resistant grade increased Intermittent heating TaC. of the cutting

B Use positive rake tools. edge. High Vc and C Increase nose radius. high volume metal Reduce in the following order: D removal. surface speed, feed or depth of cut. E Avoid use of coolant. Thermal Cracking A Use a tougher grade.

Cutting tool N°Failure type
B Use negative rake angle inserts.
excessively brittle. 1Flank wear
C Increase nose radius.
Tool too hard Chipping
D Use increased edge land.2
for application
E Increase cutting speed.3Partial fracture
conditions.
Chipping 4Crater wear
Use a harder, more wear resistant 5Deformation
Grade not hard A
grade. 6Thermal Crack
enough for
application.B Decrease surface speed.7Built up edge

High surface speed. C Increase feed. D Use coolant. Excessive Flank Wear Notching occurs at A Increase approach angle to

depth of cut line. maximum.

Usually due to work B Increase nose radius for shallow 5

hardened surface, cuts. 2

scale or abrasion. C Reduce V surface speed and feed. c D Vary the depth of cut. 6 Notching

A Increase surface speed. Surface speed too 3 B Use inserts that reduce friction. i.e. low for material 7 TiALN PVD Coated being machined.

C Use high lubricity coolant. 1 4

Built-Up-Edge Heavy feed or high A Reduce surface speed. surface speed. B Reduce feed. C Use a harder grade. D Use a more heat resistant grade.

Deformation A Use a harder grade. Excessive heat and B Reduce surface speed. pressure causing C Reduce feed. chip to weld to rake D Increase the rake angle. angle.

Crater Wear