Function of tool features for turning Rake angle is cutting edge angle that has a large effect on cutting resistance chip disposal cutting temperat

Function of tool features for turning Rake angle is cutting edge angle that has a large effect on cutting resistance chip disposal cutting temperat

Function of tool features for turning Rake angle is cutting edge angle that has a large effect on cutting resistance chip disposal cutting temperature and tool life. Positive Rake Angle Positive Insert Chip Disposal and Rake Angle 200 x Tool Life o Standard VB 0.4 . E e c c jo- . 5 3P a aS- o E 140 120 100 i 1400 1200 1000 600 500 Tool Life Standard VB 0.4mm Depth of Cut 1mm Feed 0.32mm/rev Cutting Resistance Vertical Force Depth of Cut 2mm Feed 0.2mm/rev Cutting Speed 100m/min Rake Face Mean Depth of Cut 2mm Temperature Feed 0.2mm/rev Cutting Speed 100m/min 50 100 200 Cutting Speed (m/min) Cutting Conditions Grade STi10 Depth of Cut 1 mm Feed 0.32mm/rev Workpiece JIS SK5 Rake Angle and Tool Life -15 -10 -5 0 5 10 15 20 25 Rake Angle () Cutting Conditions Workpiece JIS SK5 Grade STi10T Insert 0-Var-5-5-20-20-0.5mm Dry Cutting Effects of Rake Angle on Cutting Speed Vertical Force and Cutting Temperature When to Increase Rake Angle in the Negative (-) Direction Effects of Rake Angle 1. Increasing rake angle in the positive (+) direction improves sharpness. 2. Increasing rake angle by 1 in the positive (+) direction decreases cutting power by about 1%. 3. Increasing rake angle in the positive (+) direction lowers cutting edge strength and in the negative (-) direction increases cutting resistance. FLANK ANGLE Flank angle prevents friction between flank face and workpiece resulting in smooth feed. O Hard workpieces. O When the cutting edge strength is required such as for uncut surfaces and interrupted cutting. When to Increase Rake Angle in the Positive (+) Direction O Soft workpieces. O Workpiece is easily machined. O When the workpiece or the machine have poor rigidity. Flank angle creates a space between tool and workpiece. Flank angle relates to flank wear. Cutting Conditions Flank Angle ( J) Workpiece JIS SNCM431 (200HB) Grade STI20 Insert 0-6-j3-j3-20-20-0.5mm Depth of Cut 1 mm Feed 0.32mm/rev Cutting Time 20min Flank Angle and Flank Wear Relationship Effects of Rake Angle 1. Increasing flank angle decreases flank wear occurrence. 2. Increasing flank angle lowers cutting edge strength. When to Decrease Flank Angle O Hard workpieces. O When cutting edge strength is required. When to Increase Flank Angle O Soft workpieces. O Workpieces suffer from work hardening easily. Negative Rake Angle Negative nsert Small Flank Angle Wear Depth Q007 TECHNICAL DATA rake angle