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Coated CBN-Series for Hardened Steel Turning

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New Generation Coated CBN Grades

Wear and fracture resistance greatly improved for a wide range of continuous and interrupted applications.

Features of the Grade

New Advanced Ceramic Coating

BC8105

Offers excellent surface finishes.
Peeling resistance and adhesion strength are improved by having both lubricity and wear resistance.

BC8110

Chipping caused by built up edge is prevented with improved welding resistance.
Improved wear and adhesion strength to the CBN surface.

BC8120

Chipping caused by built up edge is prevented with improved welding resistance.
Improved adhesion to the coating to the CBN surface enhances peeling resistance.
The CBN is also improved in toughness by adopting new binder and sintering method.

BC8130

Peeling caused by severe impact and chipping are prevented with high fracture resistances.
Improved adhesion strength to the CBN surface.

Optimised Substrate Technology

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■ The new ultra micro-particle binder prevents linear crack development to avoid sudden fracturing.

SELECTION CRITERIA

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BC8105 Highest Accuracy

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Application Range

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Excellent surface finishes and close tolerances with long tool life For surface finishes up to Rz 2.4μm (Ra 0.6μm)

Surface Finish

Insert : NP-DNGA150608GS2
Work Material : SMn433 (60HRC)
Machining Methods :
External Continuous Cutting
Cutting Speed vc (m/min) : 176
Feed f (mm/rev) : 0.09
Depth of Cut ap (mm) : 0.15
Cutting Mode : Wet (Emulsion)

BC8105 is first choice for superior surface finishes.

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BC8110 High Speed Turning

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For Continuous Cutting

Covers a wide application range for continuous cutting

Tool Life (Flank Wear)

Insert : NP-CNGA120408GS2
Work Material : SCr420 (60HRC)
Machining Methods :
External Continuous Cutting
Cutting Speed vc (m/min) : 250
Feed f (mm/rev) : 0.10
Depth of Cut ap (mm) : 0.2
Cutting Mode : Dry

BC8110 is first choice for high speed finishing.

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BC8120 General Application

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For Continuous and Light Interrupted Cutting

1st choice for roughing and pre-finishing
Covers a wide application range between continuous and light-interrupted machining

Test of Interrupted Cutting

Insert : NP-CNGA120408GA2
Work Material : SCr420 (60HRC)
Machining Methods :
External Interrupted Cutting
Cutting Speed vc (m/min) : 250
Feed f (mm/rev) : 0.15
Depth of Cut ap (mm) : 0.1
Cutting Mode : Dry

Cutting edge condition after 8000 impacts

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BC8130 Tough Machining

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For Unstable Applications and Heavy Interrupted Cutting

Tolerance accuracy maintained over a high number of impacts

Heavy Interrupted Cutting (Laboratory Test)

Insert : NP-CNGA120408GA2
Work Material : SCr420 (60HRC)
Machining Methods :
External Heavy Interrupted Cutting
Cutting Speed vc (m/min) : 250
Feed f (mm/rev) : 0.05
Depth of Cut ap (mm) : 0.1
Cutting Mode : Wet

BC8130 provides stability up to 30000 impacts

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Features of the Insert

Honing

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■ A variety of cutting edge preparations for all application.

Breaker

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■ Breaker system for excellent chip control when finishing, removing carburized layers and hard-soft
machining.

Wiper Insert

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Improving Surface Finish
Under the same machining conditions as conventional breakers, but with the feed rate increased, the surface finish of the workpiece can be improved.

Improving Efficiency
High feed rates not only shorten machining times but also make it possible to combine roughing and finishing operations.

Increased Tool Life
When using at high feed conditions, the time required to cut one component is decreased, thus more parts can be machined with each insert. In addition, the high feed rate prevents rubbing, therefore, delaying the progression of wear and increasing tool life.

Improving Chip Control
Under high feed conditions, the chips generated become thicker and are more easily broken, thus, chip control is improved.

Recommended Cutting Conditions and Performance

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Cutting Performance

Insert : NP-CNGA120408
Work Material : Hardened Steel (HRC60)
Machining Methods : Continuous
Cutting Speed vc (m/min) : 120
Depth of Cut ap (mm) : 0.1
Cutting Mode : Dry

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Application Examples

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The above application examples are customer's application examples, so it can be different from the recommended conditions.

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