Sumitomo - Полный каталог инструмента - 2016 EN
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Grooving Tool Holders
GND Type
Holder Selection Key Points for Face Machining
Precautions for Groove Expansion
Recommended Chipbreaker: MG, ML, GG, GL, GF
Max. Diameter Min. Bore 1
Min. Diameter 2
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
Principal Force toward the outside, the wall
Grooving & thickness remaining on the
Parting-Off principal force side will be-
come thinner, which reduces
the rigidity of the holder.
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
Internal Machining Work Material: 15CrMo5 (25mm)
GG
Holder: GNDI R2532 T306
GCMN 3002 GG
Insert: GCM N300
Cutting Conditions: vc=100m/min, f=0,10mm/rev, ap=3,0mm, wet
External Machining
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 Cutting Conditions: vc=100m/min, f=0,10mm/rev, ap=5mm, wet
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