CNMG-SF – INNOT insert

CNMG-SF

80° negative insert for finishing superalloys and titanium, with SF chipbreaker and INNOT PVD grades.

ISO S
Finishing
PVD
★ IT9205 · IT9215

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Technical data sheet PDFCutting data, sizes and grades

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Fits on
Boring bars for internal turning95° external turning toolholders

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INNOT grades

CVD, PVD and cermet for ISO P, M, K, S

Standard ISO designation

Compatible with the insert holders you use

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Description

ISO specifications

ISO RADIUS (RE) AVAILABLE GRADES CHIPBREAKER
CNMG1204 0.4 – 0.8 – 1.2 IT7115 – IT9205 – IT9215 SF

SF chipbreaker data sheet

Operation Finishing
ISO material S (heat-resistant superalloys and titanium alloys)
Tolerance M
Features Chipbreaker for finishing heat-resistant superalloys and titanium alloys. The specially designed corner radius and the sharp cutting edge reduce cutting forces and tool vibration, for a smooth surface and good chip evacuation.

Available INNOT grades

Grade ISO Coating Composition Application
IT7115 M · S PVD AlTiSiN + TiSiN Sub-micron grain substrate with nano-gradient coating: excellent wear and oxidation resistance, great stability. Suitable for titanium alloys and superalloys.
IT9205 ★ S PVD AlTiN + TiSiN + AlCrN Highly wear-resistant grade for superalloys. Uniform sub-micron hard phase and alloying elements for greater reliability; excellent thermal stability and oxidation resistance.
IT9215 ★ S PVD AlTiN + TiSiN + AlCrN Universal grade for turning superalloys. Greater toughness and reliability; the multilayer structure limits cracks and protects the coating from flaking and chipping.

★ Recommended grade for this chipbreaker. PVD = physical vapour deposition coating. ISO S = superalloys and titanium. ISO M = stainless steels.

Recommended cutting data

Printable cutting data tableAll the data on this page in an INNOT PDF to keep in the shop.Download PDF
External turning of superalloys (ISO S)

Heat-resistant superalloys (Inconel 718 and similar). Recommended cutting data for the SF chipbreaker.

Condition Grade Vc (m/min) fn (mm/rev) ap (mm)
Stable IT9205 40 – 80 0.02 – 0.20 0.20 – 1.80
Stable IT9215 30 – 70 0.02 – 0.20 0.20 – 1.80
Average IT9205 40 – 80 0.02 – 0.20 0.20 – 1.80
Average IT9215 30 – 70 0.02 – 0.20 0.20 – 1.80
Difficult IT9205 40 – 80 0.02 – 0.20 0.20 – 1.80
Difficult IT9215 30 – 70 0.02 – 0.20 0.20 – 1.80

IT9205 allows higher cutting speeds; IT9215 offers greater toughness. Start from the minimum Vc and increase according to wear. Always use plenty of coolant.

Internal turning (boring) of superalloys (ISO S)

Starting values for internal turning with a boring bar, derived from this insert's external turning data: cutting speed −15%, feed −20%, maximum depth of cut −40%. Negative inserts are mounted on boring bars for bores from about Ø 25 mm upwards (Ø 32–40 mm for the larger sizes).

Condition Grade Vc (m/min) fn (mm/rev) ap (mm)
Stable IT9205 35 – 70 0.02 – 0.16 0.20 – 1.10
Stable IT9215 25 – 60 0.02 – 0.16 0.20 – 1.10
Average IT9205 35 – 70 0.02 – 0.16 0.20 – 1.10
Average IT9215 25 – 60 0.02 – 0.16 0.20 – 1.10
Difficult IT9205 35 – 70 0.02 – 0.16 0.20 – 1.10
Difficult IT9215 25 – 60 0.02 – 0.16 0.20 – 1.10

With a boring bar overhang above 3 times the diameter (steel bar) or 5 times (carbide or anti-vibration bar), reduce speed and feed further. Use the bar's internal coolant to clear the chips.

Application case: nickel-iron superalloy
Part Main steam valve
Material Nickel-iron-based superalloy (Incoloy 901 type)
Operation External turning, emulsion
Insert CNMG120408-SM · IT9215
Vc 41.7 m/min
fn 0.2 mm/rev
ap 2.5 mm
Result Even wear, tool life +30% compared with the previous insert