Общий каталог Sumitomo 2018 - 2019 - страница 207

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Grooving & Parting-Off Grooving Tool Holders GND Type Key Points for Face Machining Holder Selection Precautions for Groove Expansion Recommended Chipbreaker: MG, ML, GG, GL, GF Max. Diameter Min. Bore 1 2 Min. Diameter 3 4 5 Select a holder so that the outer diameter of the first groove to If the first groove meets the range of the effective grooving be machined comes within the range of maximum and mini- diameter during groove expansion, the grooving diameter will mum grooving diameter of the holder. not be limited for the second and later passes. Precautions for Turning Recommended Chipbreaker: MG, ML Considering the rigidity of the holder, we recommend machining from the outside to the inside. Outer Side Inner Side Not Recommended: Inner Side Outer Side Feed Dir. Feed Dir. Cutting Point Cutting Point If machining is performed toward the outside, the wall thickness remaining on the principal force side will be- come thinner, which reduces the rigidity of the holder. Principal Force Principal Force - If the first groove meets the range of the effective grooving diameter in face turning, the grooving diameter will not be limited for the second and later passes. - Select the chipbreaker of the lower limit side of the recommended cutting conditions and straight chips before evacuation. (In face grooving, broken chips easily get stuck in grooves, which causes problems.) - When breaking chips, step feed is required. Key Points for Internal Machining Precautions for Internal Machining Recommended Chipbreaker: ML, GL If the prepared hole diameter is small, use an ML or GL low-feed chipbreaker, each of which reduces chip curl diameter, to ensure adequate chip evacuation. MG ML GG GL GCMN 3004 MG GCMN 3002 ML GCMN 3002 GG GCMN 3002 GL Work Material: 15CrMo5 (Ø25mm) Holder: GNDI R2532 T306 Insert: GCM N300 Cutting Conditions: vc=100m/min, f=0,10mm/rev, ap=3,0mm, wet Internal Machining External Machining GG GG Chip shapes differ between internal and external   machining even under the same cutting conditions. Work Material: 15CrMo5 Holder: GNDL R2525M 320 Insert: GCM N3002 GG GCMN 3002 GG GCMN 3002 GG Cutting Conditions: vc=100m/min, f=0,10mm/rev, ap=5mm, wet F12