B40For heavy interrupted machining | CBN for machining hardened material

High performance, low cost CBN

Recommended for heavy interrupted cuts

Excellent toughness and stable machining
Ideal for hardened materials of HRC 55 or higher

Product video

Features

  • Exceptional toughness due to a special TiN binder blended with the CBN
  • Chipping resistance achieves stable machining through heavy interruptions

Tooling application

Heavy interrupted machining of hardened materials of HRC55 or above

Grade application chart

Cutting conditions

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●1st Recommendation
〇2nd Recommendation
Grade Material Operation type Machining Cutting speed (m/min) Feed(mm/rev) DOC(mm) DRY WET
B40 Hardened material (HRC55 or above Turning Heavy interrupted machining Finishing 30 - 150 ~ 0.1 ~ 0.5

Edge preparations

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Performance comparison by edge preparation

As the edge preparation increases the tool pressure on the insert increases.
[ Cutting conditions ]
SCM415(HRC63-65)  vc=200m/min  f=0.1mm/rev  ap=0.2mm, DRY
[ Insert ]
TNGA160408
There is a direct correlation between an increase in the edge preparation and improvement of insert fracture resistance.
[ Cutting conditions ]
SCM415(HRC63-65)  vc=75m/min  f=0.1mm/rev  ap=0.3mm  DRY
[ Insert ]
TNGA160408

Case study

Interrupted ID boring of automotive parts
Material :
S55C ( HRC62 )
Cutting speed :
110m/min
Feed :
0.14mm/rev
DOC :
0.15mm/rev
Coolant :
DRY
B40

2,300 pcs / corner

Competitor's CBN

1,500 pcs / corner

B40 achieved longer tool life through the heavy interruptions without chipping
Interrupted OD turning gear part coupling
Material :
S50C ( HRC61 )
Cutting speed :
28m/min
Feed :
0.12mm/rev
DOC :
0.25mm/rev
Coolant :
WET
B40

400 pcs / corner

Competitor's CBN

100 pcs / corner

Competitor's CBN had edge damage due to interruptions. B40's excellent toughness achieved 4 times longer tool life.

Tool lineup

View Catalog Information

Please check product catalog for tooling lineup