DNMG-ZR – INNOT insert

DNMG-ZR

55° negative insert for turning ductile cast iron, with ZR chipbreaker and CVD grade IT6215.

ISO K
Finishing – roughing
CVD
★ IT6215

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Technical data sheet PDFCutting data, sizes and grades

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Fits on
93° profiling toolholders

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INNOT grades

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

Standard ISO designation

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Description

ISO specifications

ISO RADIUS (RE) AVAILABLE GRADES CHIPBREAKER
DNMG1504 0.4 – 0.8 – 1.2 IT6215 ZR
DNMG1506 0.4 – 0.8 – 1.2 IT6215 ZR

ZR chipbreaker data sheet

Operation Finishing – roughing
ISO material K (ductile cast iron, also suitable for grey cast iron)
Tolerance M
Features Chipbreaker developed for ductile cast iron: it balances sharpness and edge strength, with low cutting forces and high quality. It ensures excellent reliability even with heavy impacts and is also suitable for turning grey cast iron, with great versatility and wear resistance. 55° rhombic shape: a slimmer tip than the 80°, ideal for profiling, copy turning and contour turning with access to shoulders.

Available INNOT grades

Grade ISO Coating Composition Application
IT6215 ★ K CVD TiN + MT-TiCN + Al₂O₃ First-choice grade for ductile cast iron. Second-generation CVD coating with greater cohesion between layers, preventing flaking; the post-coating treatment increases impact resistance. Particularly suitable for interrupted cuts.

★ Recommended grade for this chipbreaker. CVD = chemical vapour deposition coating. ISO K = cast irons.

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 ductile cast iron (ISO K) – ZR chipbreaker

Recommended cutting data by material and cutting condition.

Material Condition Vc (m/min) by grade fn (mm/rev) ap (mm)
Ductile cast iron ≤ 450 MPa
(GGG40, GGG50 – EN-GJS-400, EN-GJS-500)		 Stable IT6215: 145 – 285 0.15 – 0.50 0.50 – 5.00
Ductile cast iron ≤ 450 MPa
(GGG40, GGG50 – EN-GJS-400, EN-GJS-500)		 Average IT6215: 145 – 285 0.15 – 0.50 0.50 – 5.00
Ductile cast iron ≤ 450 MPa
(GGG40, GGG50 – EN-GJS-400, EN-GJS-500)		 Difficult IT6215: 145 – 285 0.15 – 0.50 0.50 – 5.00

Guide values. The ZR chipbreaker is also suitable for grey cast iron.

Internal turning (boring) of ductile cast iron (ISO K) – ZR chipbreaker

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).

Material Condition Vc (m/min) by grade fn (mm/rev) ap (mm)
Ductile cast iron ≤ 450 MPa
(GGG40, GGG50 – EN-GJS-400, EN-GJS-500)		 Stable IT6215: 125 – 240 0.12 – 0.40 0.50 – 3.00
Ductile cast iron ≤ 450 MPa
(GGG40, GGG50 – EN-GJS-400, EN-GJS-500)		 Average IT6215: 125 – 240 0.12 – 0.40 0.50 – 3.00
Ductile cast iron ≤ 450 MPa
(GGG40, GGG50 – EN-GJS-400, EN-GJS-500)		 Difficult IT6215: 125 – 240 0.12 – 0.40 0.50 – 3.00

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.

Cutting data on ductile cast iron EN-GJS-600 (GGG60) – IT6215

Guide values by type of operation.

Condition Operation Vc (m/min) fn (mm/rev) ap (mm)
Stable Finishing 230 – 365 0.10 – 0.30 0.2 – 1.0
Stable Semi-finishing 210 – 335 0.20 – 0.35 0.5 – 1.5
Stable Roughing 195 – 315 0.25 – 0.40 1.0 – 3.0
Average / Difficult Finishing 205 – 335 0.10 – 0.30 0.2 – 1.0
Average / Difficult Semi-finishing 190 – 305 0.20 – 0.35 0.5 – 1.5
Average / Difficult Roughing 180 – 285 0.25 – 0.40 1.0 – 3.0