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° -20° -30° +20° Radial Rake Angle R.R +15° +25° +15° -25° ② Radial Rake Angle R.R +20° ① Axial Rake Angle A.R Axial Rake Angle A.R -15° -20° +15° -10° ① +10° +15° +10° -15° +10° + 5° +10° + 5° - 5° -10° + 5° + 5° - 5° 0° 0° ④ 0° 0° 0° 0° - 5° - 5° - 5° + 5° + 5° - 5° -10° -10° -10° +10° -15° +10° +15° -10° -15° -20° -15° +15° +20° -15° -20° -25° -20° +20° +25° -20° -30° +30° -25° ② ③ -25° +25° ③ -25° -30° 5° 10° 15° 20° 25° 30° 35°40°45°50°55° 60° 65° 70° 75° 80° 85° 90°-30° +30° -30° 0° 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° ｝-> T.A. (Ex.) (1) A.R (Axial rake angle) =–10° ｝-> I (Inclination angle) (2) R.R (Radial rake angle) = –30° (True rake angle) = –8° (4) (2) R.R (Radial rake angle) =+15° =–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 Edge Combination and A.A (15° to 30°) A.A (30° to 45°) A.A (15° to 30°) A.R. A.R. A.R. Chip Removal Positive Positive Negative A.R: Axial rake angle R.R: Radial rake angle A.A: Approach angle : Chip and removal direction R.R. R.R. : Rotation Positive Negative R.R. Negative Advantages Good cutting action Excellent chip removal and cutting Double-sided inserts can be used action and higher cutting edge strength Disadvantages Lower cutting edge strength and only Only single-sided inserts can be Dull cutting action N single-sided inserts can be used used Technical Guidance / Application For general milling of steel and low For Steel, Cast iron, Stainless steel, For light milling of cast iron and References rigidity work piece Alloy steel steel 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