Общий каталог Tungaloy 2020 - 2021 - страница 229

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T-CBN series for hardened steel and hard material B

■ Application areaNecessity of PCBN gradesFeatures of CBN grades for
The conditionMmachining hardened steel and
necessary to cutaterial is:other hard materials
the workHardness of tool * Hardness of tool X 3C

65 Fracture Hardened steel (60HRC) → 700 Hv Cemented carbide → 1600 Hv PCBN (BX360) → 3300 Hv resistance

60 Relation of CBN grain size, surface roughness, and cutting speed

T-CBN

55Ceramic[Fine-grained CBN][Rough-grained CBN]
Wear
50resistanceD
45Coated / Cermet
100

1-2μm 4-8μm CBN content

ContinuousLightHeavye
interruptedFine grained PCBN provided withRough grained PCBN. CBN particlesFewer CBN contentIncreasing wear resistance
interruptedsharp cutting edge.are hold fi rmly.
Cutting modeGood surface roughnessAllows high speed machiningMuch CBN content e Increasing impact resistance E
Basic selection of T-CBN grades in machining of hardened steel and hard material
Coated T-CBN gradesUncoated T-CBN grades
BXM10For high speeds cuttingBX310 For high speeds / Priority on wear resistance in continuous cutting
BXM20For general purpose,BX330 For medium speeds / Priority on surface qualityF

more than Vc = 180 m/min For general purpose, BX360 For low to medium speeds / General purpose grade with BXA20 excellent fracture resistance less than Vc = 180 m/min

BX380 For low to medium speeds / Priority on fracture resistance

in heavy interrupted cutting

  • Application area of coated T-CBN grades G

Continuous cutting Interrupted cutting

300 300

BXM10 BXM10

Continuous Lightly

200 BXM20 cutting 200 BXM20 interrupted H

BXA20 BXA20 100 100 Interrupted I

0 0

0 0.15 0.3 Light Interrupted Heavy

Feed (mm/vev) Effects of Coated T-CBN grades J Protect CBN from oxidation wear Since the coating layer intercepts air, oxidation wear of Improved resistance

Coated on hard CBN CBN can be prevented. to fl ank wear

Hardness: Peeling of coating layer can be prevented CBN > Coating layer Hard and deformation resistant CBN is excellent substrate material. K

Effects of coolant in machining of hardened steel

Continuous cutting Interrupted cutting 19 In continuous cutting, wet Cutting conditions cutting is superior to dry 0.10

Dry Workpiece material: Chromium L

Wet 15 molybdenum steel cutting in tool life for wear.

Continuous14Heavy
0.08cutting(JIS SCM415), 60 HRCinterrupted
Cutting speed: Vc = 100 m/min
Depth of cut: ap = 0.25 mmIn interrupted cutting, dry
Cutting conditions10
0.06f
Workpiece material: Chromium10 Feed: = 0.15 mm/revcutting is superior to wet
molybdenum steel
0.04(JIS SCM415), 60 HRCcutting in tool life for
5.5
Cutting speed: Vc = 150 m/min5
a4 fracture.
0.02BX330 Depth of cut: p = 0.25 mmBX360
f2.5M
Feed: = 0.1 mm/rev
00

10 20 30 Dry Wet

Cutting time (min)