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Hardbreaker Series

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CBN inserts with integrated chipbreaker for improved hard turning productivity

CBN inserts with chipbreaker ideal for carburized layer removal and finishing hardened steel

Applications & Features

Applications

Internal turningExternal turning

Features

HS chipbreaker

Optimized chipbreaker design for excellent chip control during hard turning at aggressive conditions

  • Designed for high feed machining.
  • Provides excellent chip control for a wide range of D.O.C. and feed rates.
  • Edge preparation is designed to prevent catastrophic failure.

HP chipbreaker

Designed for finish machining of hardened parts with close tolerances

  • Optimized chipbreaker geometry significantly reduces cutting force imposed on the cutting edge, ensuring long tool life.
  • The edge preparation is designed to generate low cutting force, providing chatter-free machining and close tolerances.
  • The built-in wiper yields excellent surface quality and good chip control.

HF and HM chipbreakers

  • Suited for hard turning applications requiring great D.O.C. such as carburized layer removal.
  • Effective chip breaking is possible for a wide range of hard materials.
  • BXA20 and BXM20 CBN grade inserts are available for aggressive cutting depths.

Inserts & Grades

Inserts


HS chipbreaker

  • Optimized chipbreaker design for excellent chip control during hard turning at aggressive conditions

HP chipbreaker

  • Designed for finish machining of hardened parts with close tolerances

HF chipbreaker

  • Suited for hard turning applications requiring great D.O.C. such as carburized layer removal

HM chipbreaker

  • Suited for hard turning applications requiring great D.O.C. such as carburized layer removal
Main Grades

BXM10

  • Coated CBN for excellent performance in high-speed continuous cutting of hardened steel

BXA10

  • First choice for continuous to light interrupted cuts of hardened steel turning
  • For cutting speed = 230 m/min or less

BXA20

  • First choice for light to heavy interrupted cuts
  • For Vc = 180 m/min or less

Practical examples

Example #1
Part: Road roller (heavy equipment)
Material: S45C / C45 (58HRC)
Insert: 3QP-TNGM160408-HS
Grade: BXM20
Cutting conditions: Vc = 180 (m/min)
f = 0.15 (mm/rev)
ap = 0.25 (mm)
Coolant: Wet
Example #2
Part: Input shaft
Material: SCM420 / 18CrMo4 (58 – 60HRC)
Insert: 2QP-CNGM120408-HS
Grade: BXM10
Cutting conditions: Vc = 113 – 238 (m/min)
f = 0.17 (mm/rev)
ap = 0.25 (mm)
Coolant: Wet
Example #3
Part: Bevel gear
Material: SCM420 / 18CrMo4 (58HRC)
Insert: 2QP-CNGM120408-HP
Grade: BXA20
Cutting conditions: Vc = 160 (m/min)
f = 0.1 (mm/rev)
ap = 0.15 (mm)
Coolant: Wet

Standard cutting conditions

ISO Chipbreaker Grade Work condition Cutting speed
Vc (m/min)		 Depth of cut
ap (mm)		 Feed
f (mm/rev)
HP BXA10 Continuous 120 – 350 0.03 – 0.22 0.03 – 0.25
HP BXM10 Continuous 120 – 350 0.03 – 0.22 0.03 – 0.25
HP BXA20 Light interrupted 70 – 180 0.03 – 0.22 0.03 – 0.25
HS BXA10 Continuous 120 – 350 0.1 – 0.35 0.05 – 0.3
HS BXA20 Light interrupted 70 – 180 0.1 – 0.35 0.05 – 0.3
HF BXM20 Removing of
carburized layer		 70 – 180 0.3 – 0.8 0.05 – 0.3
HM BXA20 Removing of
carburized layer		 70 – 180 0.5 – 1 0.05 – 0.3
HM BXM20 Removing of
carburized layer		 70 – 180 0.5 – 1 0.05 – 0.3

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