3 HH/HL chipbreaker for hardened steel finishing Small D.O.C. (ap = 0.1 ~ 0.3 mm) Excellent chip control and Low cutting force when machining hardened material 1strecommendation HH chipbreaker (55HRC or more) Twin dots Breaks chips into small pieces Chipbreaker cross-section Wide bump Provides stable chip curls 2-step rising face prevents chip clogging Stable chip control for hardened workpieces which are 55 HRC or more Chip control comparison (Internal evaluation) 10 mm Unstable chip curls Cutting force comparison (Internal evaluation) 200 50% 150 Radial force (N) 100 50 HH chipbreaker Competitor A With chipbreaker Cutting conditions: Vc = 150 m/min, ap = 0.2 mm, f = 0.20 mm/rev, wet, CN**120408 type Workpiece: 15CrMo4, 55 HRC 0 HH chipbreaker Competitor B With chipbreaker Cutting conditions: Vc = 150 m/min, ap = 0.2 mm, f = 0.15 mm/rev, wet, CN**120408 type Workpiece: 15CrMo4, 60 HRC HL chipbreaker (Workpiece 55 HRC or less) Wide bump Chipbreaker cross-section Rake surface The rake can scoop up and control chips of softer material Chip Control Comparison (Internal Evaluation) 10 mm Stable chip curls for workpieces which are 55 HRC or less HL chipbreaker Competitor C (With chipbreaker) Cutting conditions: Vc = 150 m/min, ap = 0.2 mm, f = 0.20 mm/rev, wet, CN**120408 type workpiece: 15CrMo4, 50 HRC 2
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