3 Low cutting forces and stable machining GMI chipbreaker prevents chip clogging and reduces cutting forces. Cutting force comparison (In-house evaluation) 1,200 1,000 1,500 1,000 500 0 GMI chipbreaker Stable machining with few changes in cutting force. Resultant force Principal force Back force 15 % Cutting force (N) 800 600 400 200 0 Cutting force (N) 0 0.5 1 1.5 2 2.5 Cutting time (S) Cutting force (N) 1,500 1,000 500 0 Competitor D Instantaneous increase of cutting force due to clogged chips. GMI chipbreaker Competitor D Cutting conditions: Vc = 150 m/min, f = 0.1 mm/rev; Toolholder: KGDIR3225B-3; Insert: GDM3015N-040GMI; Workpiece: 15CrMo4 0 0.5 1 1.5 2 2.5 Cutting time (S) Case studies ø60 Bearing: 15CrMo4 Vc = 250 m/min f = 0.15 mm/rev Wet KGDIR3225B-3 GDM3015N-040GMI / PR1225 Automotive parts: 1.0040 Vc = 100 m/min f = 0.08 mm/rev Wet KGDIR3225B-3 GDM3015N-040GMI / PR1225 3 4 5 GMI Tool life GMI Chipbreaker Conventional G Chipbreaker Competitor E 1200 pcs/edge 800 pcs/edge times 1.5 50 mm • GMI chipbreaker PR1125 showed longer tool life compared with competitor E. • Stable machining without chattering and cutting noise. (User evaluation) • Competitor G creates scratches on the workpiece with long chips. • GMI chipbreaker has no problem because of good chip control. (User evaluation) Recommended cutting conditions 1st choice (Cutting speed) Recommended insert grade (Vc: m/min) Workpiece Chipbreaker Cermet TN620 Carbon steel Alloy steel Stainless steel Cast iron GMI CM 100 – 220 80 – 200 70 – 180 2nd choice Recommended cutting conditions (f, ap) Grooving Traversing MEGACOAT PR1225 80 – 200 70 – 180 60 – 150 Notes PR1535 80 – 150 70 – 150 60 – 150 PR1215 100 – 200 Chipbreaker MEGACOAT NANO part is center value of feed rate GMI (General purpose) Width (mm) 5 4 3 2 0.1 (mm) 3.0 2.0 1.0 0.2 ap 80 – 180 60 – 150 100 – 200 Wet 4 mm 3 mm 2 mm 5 mm Feed rate (mm/rev) 0.1 5 Feed rate (mm/rev) 0.2 2 ø40
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