Техническая информация Sumitomo - страница 8

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Technical Guidance Basics of Milling Milling Edition ■ Functions of the Various Cutting Angles Description Symbol Function Effect (1) Axial rake angle A.R. Determines chip removal direction, built- Available in positive to negative (large to small) rake angles; Typical combinations: (2) Radial rake angle R.R. up edge, cutting force Positive and Negative, Positive and Positive, Negative and Negative (3) Approach angle A.A. Determines chip thickness, chip Large: Thin chips and small cutting removal direction force (4) True rake angle T.A. Effective rake angle Positive (Large): Excellent machinability Low cutting edge strength. Negative (Small): Strong cutting edge and easy chip adhesion. (5) Cutting edge inclination angle I .A. Determines chip control direction Positive (Large): Excellent chip control and small cutting force. Low cutting edge strength. (6) Face cutting edge angle F.A. Determines surface roughness Small: Improved surface roughness. (7) Relief angle Determines edge strength, tool life, chattering True Rake Angle Chart (T.A) Inclination Angle (I.A) Chart +30° True Rake Angle T.A +30° -30° Inclination Angle I.A +30° +25° +25° -25° +25° +20° +30° +20° -30° -20° +20° +25° -25° ② Radial Rake Angle R.R Radial Rake Angle R.R +15° +20° +15° -15° -20° +15° Axial Rake Angle A.R Axial Rake Angle A.R +15° ① ① -15° +10° +10° -10° +10° +10° -10° + 5° + 5° + 5° - 5° - 5° + 5° 0° 0° 0° 0° 0° 0° - 5° - 5° ④ - 5° + 5° + 5° - 5° -10° +10° -10° -15° -10° +10° +15° -10° -15° -20° -15° +15° +20° -15° -25° +25° -20° -30° -20° +20° +30° -20° -25° -25° +25° -25° ② ③ ③ -30° -30° +30° -30° 0° 5° 10° 15° 20° 25° 30° 35° 40° 45°50°55° 60° 65° 70° 75° 80° 85° 90° 0° 5° 10° 15° 20° 25° 30° 35° 40° 45°50°55° 60° 65° 70° 75° 80° 85° 90° Approach Angle A.A Approach Angle A.A ｝ ｝ (Ex.) (1) A.R (Axial rake angle) = +10° (Ex.) (1) A.R (Axial rake angle) =–10° (2) R.R (Radial rake angle) = –30° -> T.A. (True rake angle) = –8° (4) (2) R.R (Radial rake angle) =+15° -> I (Inclination angle) =–15° (4) (3) A.A (Approach angle) = 60° (3) A.A (Approach angle) = 25° tan T.A=tan R.R · cos A.A + tan A.R · sin A.A tan I .R=tan A.R · cos A.A – tan R.R · sin A.A ■ Rake Angle Combination Double Positive Type Negative - Positive Type Double Negative Type A.A (15° to 30°) A.A (30° to 45°) A.A (15° to 30°) Edge Combination and A.R. A.R. A.R. Positive Positive Negative Chip Removal A.R: Axial rake angle R.R: Radial rake angle A.A: Approach angle : Chip and removal direction R.R. R.R. Negative : Rotation Positive R.R. Negative Excellent chip removal and cutting Double-sided inserts can be used Advantages Good cutting action action and higher cutting edge strength Lower cutting edge strength and only Only single-sided inserts can be Disadvantages Dull cutting action N Application single-sided inserts can be used For general milling of steel and low used For Steel, Cast iron, Stainless steel, For light milling of cast iron and Technical Guidance / rigidity work piece Alloy steel steel References Series DPG Type WGX Type, UFO Type DGC Type, DNX Type Chips (Ex.) · Work material: SCM435 · vc=130m/min fz =0.23mm/t ap=3mm N16