Общий каталог Tungaloy 2020 - 2021 - страница 229

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Flank wear width VB (mm) Workpiece hardness (HRC)Cutting speed Vc (m/min) Tool life (min) Cutting speed Vc (m/min) Increasing InsertExt. ToolholderInt. ToolholderThreadingGroovingMiniature toolMilling cutterEndmillDrilling toolTooling SystemUser's GuideIndex Te c h n i c a l Guide A T-CBN series for hardened steel and hard material■ Application area Necessity of PCBN grades ᭹ Features of CBN grades for B 65 The conditionnecessary to cutthe workMaterial is:Hardness of tool * Hardness of tool X 3 machining hardened steel andother hard materials ᭹ Hardened steel (60HRC) → 700 Hv ᭹ Cemented carbide → 1600 Hv60᭹ PCBN(BX360)→ 3300 HvRelation of CBN grain size, surface roughness, and cutting speed55CeramicT-CBN[Fine-grained CBN][Rough-grained CBN]FractureresistanceC 50 Wearresistance 45Continuous Coated / Cermet 10 01-2μm4-8μmCBN contentLightinterruptedHeavyinterruptedFine grained PCBN provided withsharp cutting edge.Rough grained PCBN. CBN particlesare hold firmly.Fewer CBN content e Increasing wear resistanceD Cutting mode Good surface roughness Allows high speed machining Much CBN content e Increasing impact resistance Basic selection of T-CBN grades in machining of hardened steel and hard material᭹ Coated T-CBN grades ᭹ Uncoated T-CBN grades E BXM10 For high speeds cutting BX310 For high speeds / Priority on wear resistance in continuous cutting BXM20 For general purpose,more than Vc = 180 m/minBXA20For general purpose,less than Vc = 180 m/minBX330 For medium speeds / Priority on surface qualityBX360For low to medium speeds / Generalexcellent fracture resistancepurpose gradewithBX380For low to medium speeds / Priority onin heavy interrupted cuttingfractureresistanceF ■ Application area of coated T-CBN grades ᭹ Continuous cutting ᭹ Interrupted cutting300300 G BXM10 BXM10 200 BXM20 Continuouscutting 200 BXM20 Lightlyinterrupted BXA20100 100 BXA20 H Interrupted 0 0 0 0.15 0.3Feed (mm/vev) Light Interrupted Heavy I Effects of Coated T-CBN grades ᭹ Protect CBN from oxidation wearCoated on hard CBNSince the coating layer intercepts air, oxidation wear ofCBN can be prevented.Hardness:᭹ Peeling of coating layer can be preventedImproved resistanceto flank wearJ CBN > Coating layer Hard and deformation resistant CBN is excellent substrate material. Effects of coolant in machining of hardened steel᭹ Continuous cutting ᭹ Interrupted cutting K 19 ᭹ In continuous cutting, wet Cutting conditions 0.10 ᭹ Workpiece material: Chromium cutting is superior to dry 0.080.06 Dry Wet Continuous 15cuttingCutting conditions10᭹ Workpiece material: Chromiummolybdenum steelmolybdenum steel14(JIS SCM415), 60 HRCHeavycutting in tool life for wear.᭹ Cutting speed: Vc = 100 m/mininterrupted᭹ Depth of cut: ap = 0.25 mm᭹ In interrupted cutting, dry10᭹ Feed: f = 0.15 mm/revcutting is superior to wetL 0.04 (JIS SCM415), 60 HRC᭹ Cutting speed: Vc = 150 m/min 5 5.5 cutting in tool life for 0.02 BX330 ᭹ Depth of cut: ap = 0.25 mm᭹ Feed: f = 0.1 mm/rev 4BX3602.5 fracture. 0 0102030Cutting time (min)Dry Wet M Tungaloy B197