Краткий справочник по резанию материалов на металлообрабатывающих станках TECHNICAL DATA

Краткий справочник по резанию материалов на металлообрабатывающих станках TECHNICAL DATA

Краткий справочник по резанию материалов на металлообрабатывающих станках TECHNICAL DATA _ TECHNICJ FUNCTION OF TOOL FEATURES FOR FACE MILLING FUNCTION OF EACH CUTTING EDGE ANGLE IN FACE MILLING Each Cutting Edge Angle in Face Milling Type of Angle Symbol Function Effect Axial Rake Angle GAMP Determines chip disposal direction. Positive: Excellent machinability. Radial Rake Angle GAMF Determines sharpness. Negative: Excellent chip disposal. Lead Angle KAPR Determines chip thickness. Small: Thin chips and small cutting impact. Large back force. True Rake Angle T Determines actual sharpness. Positive (large): Excellent machinability. Minimal welding. Negative (large): Poor machinability. Strong cutting edge. Cutting Edge Inclination 1 Determines chip disposal direction. Positive (large): Excellent chip disposal. Low cutting edge strength. STANDARD INSERTS Positive and Negative Rake Angle Standard Cutting Edge Shape Negative Rake Angle Neutral Rake Angle 0° Positive Rake Angle (+> Insert shape whose cutting edge precedes is a positive rake angle. Insert shape whose cutting edge follows is a negative rake angle. LEAD ANGLE (KAPR) AND CUTTING CHARACTERISTICS £3000 2500 jj 2000 1500 £ 1000 e 500 I -500 Lead Angle: 90° Principal / Force cf n Back Force fz (mm/t.) Lead Angle: 75° 0.1 0.2 0.3 fz (mm/t.) Lead Angle: 45° Back Force l I L 0.1 0.2 0.3 fz (mm/t.) Workpiece JIS SCM440 (281HB) Tool: 0125mm Single Insert Cutting Conditions vc=125.6m/min ap=4mm ae=110mm Cutting Resistance Comparison between Different Insert Shapes Back Force Principal Force Lead Angle 0° Back force is in the minus direction. Lifts the workpiece when workpiece clamp rigidity is low. Lead Angle Lead angle 75° is recommended for A CO face milling of workpieces with low rigidity such as thin workpieces. Lead Angle 45° The largest back force. Bends thin workpieces and lowers cutting accuracy. Prevents workpiece edge chipping when cast iron cutting. Three Cutting Resistance Forces in Milling Principal force Force is in the opposite direction of face milling rotation. Back force Force that pushes in the axial direction. Feed force Force is in the feed direction and is caused by table feed. 1988 Mitsubishi Materials