Общий каталог Sumitomo 2019 - 2020 - страница 332

SEC-Grooving Tools
GND Type
Key Points for Facing
Holder Selection Precautions for Groove Expansion Recommended Chipbreakers MG ML GG GL GF GA
Grooving
Tools


Min. bore diameter
Max. bore diameter 1
2
3

F
Min. bore diameter 4
5
· Select a holder with which the outer diameter of the first groove
to be machined is between the maximum and minimum grooving
diameters of the holder. · If the first groove is within the effective work diameter range
· If the machining start point is within the effective work diameter during groove expansion via plunging, the work diameter will not
range, the work diameter will not be limited for subsequent passes. be limited for subsequent passes.
Precautions for Traverse Cutting  Recommended Chipbreakers MG ML RN
Considering the rigidity of the holder, we recommend machining from the outside to the inside.
External → Internal Internal → External

Feed Direction Feed Direction
Cutting Point Cutting Point

If machining is performed from the
Principal Force


Principal Force
inner to the outer diameter, the wall
thickness remaining on the principal
force side will become thinner,
reducing the rigidity of the holder.
· If the machining start point for traverse face cutting operation is within the effective work diameter range, the work diameter will not be
limited for subsequent passes.
· Select the lower limit of the recommended cutting conditions for the chipbreaker and lengthen the chips for evacuation. (In face grooving,
broken chips easily get stuck in grooves, which causes problems.)
· When breaking chips, step feed is required.

Key Points in Internal Diameter Machining
Precautions for Internal Diameter Machining  Recommended Chipbreakers ML GL GF
If the prepared hole diameter is small, use an ML type or GL type low-feed chipbreaker, both of which reduce chip curl diameter, to ensure
adequate chip evacuation.
MG ML GG GL


GCMN3004-MG GCMN3002-ML GCMN3002-GG GCMN3002-GL
Work Material: SCM415 Prepared Hole Diameter: ø25mm Holder: GNDI R2532-T306 Insert: GCM N300○-○○
Cutting Conditions: vc = 100m/min, f = 0.1mm/rev, ap = 3.0mm Wet

Internal Diameter Machining External Machining
GG GG
Chip shapes differ between internal and external machining
even under the same cutting conditions.

Work Material: SCM415
Holder: GNDL R2525M-320, Insert: GCM N3002-GG
GCMN3002-GG Cutting Conditions: vc = 100m/min, f = 0.10mm/rev, ap = 5.0mm Wet


F18