 Negative Inserts, Features of new edge prep. (Machining of hard materials)

(1) MEP(High speed / Continuous)

  • Cutting force comparison
  • Wear comparison

300

①0.12mm×25°②0.05mm×45°DCLNR2525M-12SCM415H Carburizing hardened (55~60HRC)
CNGA120408 type (KBN05M)Vc=150m/min, ap=0.2mm

ME MEP C

250SCM415H Carburizing hardened (55~60HRC)f=0.15mm/rev, DRYRake face
Vc=150m/min, ap=0.2mm0.1
Width: StandardWidth: Narrowf=0.15mm/rev, DRY
200Angle: StandardAngle: Large(1) 0.12mm×25° (ME)

0.08 (2) 0.05mm×45° (MEP) 150 0.06 Feed forceFeed force 0.04

100 0.02 Back forceBack force 50

0 2 4 6 8 10

Principal forcePrincipal forceCutting forceCutting forceCutting Time (min)
0
MEP performs lower cutting force than ME"MEP prevents the Flank wear, compared to ME
⇒Sharp cutting!⇒Prevents crater wear!

(2) MEH (Interruption / High feed machining)

  • Toughness and Prevention of flaking
High toughness againstLow toughness
back forcePoor thermal conductivity
Excellent thermalFractures and flaking due
Back forceconductivityBack forceto back force

Prevention of flaking MEH Less fracture and flaking ME

(S04030) (S01225)

  • Cutting force and chamfered angle / width
Cutting ConditionsChamfered width : 0.12mmCutting ConditionsChamfered angle : 25°
Vc=100m/min ap=0.1mm f=0.25mm/revVc=100m/min ap=0.1mm f=0.25mm/rev
500500
Back forceBack force
400Principal force400Principal force
Feed forceFeed force
300300
200200
100100
0 10 20 30 40 50 6000.1 0.2 0.3 0.4 0.5

Chamfered angle (°) Chamfered width (mm) Cutting force is influenced by chamfered angle more than chamfered width. Though enlarging chamfered angle is more effective for fracture resistance improvement than changing chamfered width, the cutting force increases as well. Please refer to the graph for details.

 MEGACOAT CBN

  • Properties of PVD Coating
  • Advantages of MEGACOAT

MEGACOAT

40 Improved Stability

TiC MEGACOAT

30 TiCN

High Speed

TiNTiAINExtended Tool Life
20Machining
10· Long tool life and stable machining due to superior heat-
resistance and hardness
02004006008001,000 1,200· Stability improvement through prevention of crater wear

Oxidation temperature (°C) (oxidation, diffusional wear)

  • High thermal stability and surface smoothness provide

C2 excellent surface finish C3