Каталог Sumitomo пластины с кубическим нитридом бора Sumiboron - страница 19

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BN7500SUMIBORON for Sintered Alloy Machining

Sintered

Achieves High Precision, and Efficiency Machining of Sintered Alloy

  • General Features High density sintered material made of micro-grained CBN grains provide excellent sharpness and wear resistance for high quality surfaces in sintered alloy finishing.

Surface finish using the BN7500 Surface finish using previous CBN

  • The previous CBN left white blemishes on the finished surface whereas the BN7500 leaves a better, glossy surface finish.
  • Characteristics Excellent for finishing of Sintered Alloy

Excellent machined surface finish and surface appearance.

  • Available with 5 different types of edge treatment for machining sintered alloys of any shape or hardness The LF type has a sharper edge designed specifically for machining sintered alloys with minimal burr and improved machining precision. The HS Type has a strengthened cutting edge for stable chipping resistance during interrupted cutting and finishing. Provides machining stability by reducing the variation in early milling surface roughness with the LE edge treatment, which emphasizes superior surface finish. The LS Type, excelling in fracture resistance and cutting edge balance, also supports finishing that includes light interrupted cutting.
  • Cutting Performance
  • Early Milling Finishing Surface Roughness

10 0.6 Previous CBN standard 0.8

8Previous CBN Sharp Edge0.5StandardLSLFLE
typetypetype

BN7500 0.4 standard 6 0.6 0.3

4 BN7500 LF type

Excellent surface finish and stabilityBN75000.4
0.2
LF typeR Honing
250% reduction in burr heightControl Variations in Early Surface RoughnessControl Variations in Early Surface Roughness
0.1
0.2No R Honing
Negative LandNo Negative Land
050100150200050100150200αα
=15°=0°
No. of PassesNo. of Passes
0
Work Material: Sintered ferrous alloy SMF4040 equivalent (70HRB, Continuous cut)Work Material:Sintered ferrous alloy SMF4040 equivalent (70HRB, Continuous cut)★
Able to control early surface roughness
Insert: 2NU-CNGA120408LFInsert: 2NU-CNGA120408LF
Cutting Conditions :v =200m/min, f=0.1mm/rev, a =0.1mm, WetCutting Conditions:v =200m/min, f =0.1mm/rev, a =0.1mm, Wetvariations by applying R honing to the edge.
cpcp
  • Feed and Burr Relationship Recommended Edge Treatment

A L

LF No R Honing type (Burr Control Emphasis)

B

LE

type

LS

type When Work Rotation Direction Withdrawn R Honing Standard

  • The LF Type without R honing has a cutting edge sharpness superior to the LE Type with R honing and can control burrs better.

(Surface Roughness Emphasis)

  • For a feed rate 0.1 mm/rev or higher, LS Type has a cutting edge sharpness superior to the standard type and can control burrs better.

HS

LF typeLE typeLS typeStandardR Honingtype
(Breakage Control Emphasis)
DiagramInterruption degreeFrequent
A

Burr α W Honing

Standard 15° 0.12mm

DiagramEdge ChipNo
LF typeα = 0°
BNegative land width WRake Face
LE type(No Negative Land)
LS type15°0.07mmYesNegative land angle Negative land angle αα
Work Material: VVT FacingCBN Layer
Insert: 3NU-TNGA160404HS type25°0.05mmHoning

Flank Cutting Conditions: v =200m/min, f =0.1mm/rev, a =0.1mm, Wet c p