Общий каталог Sumitomo 2018 - 2019 - страница 563

Technical Guidance Basics of Milling Relation Between Engage Angle and Tool Life Workpiece feed direction Relation to cutter position Relation to cutter diameter Large diameter Small diameter F F F2 øD B N N F3 E E Engage angle F1 (Small) (Large) E Insert Rotation F F Engage angle denotes the angle by N which the full length of the cutting N edge comes in contact with the E workpiece, with reference to the feed E direction. The larger E is, the shorter the tool life. Relation to tool life Cutting area by Cutting area by To change the value of E: tool life (m3) tool life (m3) C50 GG25 1) Increase the cutter size 2) Shift the position of the cutter Engagement angle Engagement angle l Relation between the number of simultaneously engaged cutting edges and cutting force: Cutting Cutting Cutting Cutting Cutting force force force force force Time Time Time Time Time 0 or 1 edge in Only 1 edge in 1 or 2 edges in 2 edges in contact 2 to 3 edges in contact contact at any time. contact at any time. contact To Improve Surface Roughness j Milling inserts with wiper flat l Surface roughness without wiper flat l Influence of different face angles on surface finish When all the cutting edges - Workpiece: 34CrMo4 have wiper flats, a few teeth are Feed per Feed per - Cutter: DPG 5160 R one tooth one tooth intentionally elevated to play the role A (Single tooth) HC of a wiper insert. - vc = 154 m/min - Insert equipped with straight f t = 0,234 mm/tooth l Surface roughness with straight wiper flat Feed per Feed per doc = 2 mm wiper flat one tooth one tooth (Face angle: Approx 15’ - 1°) - Insert equipped with curved B - Face angle wiper flat HF A : 28’ (Eg. curvature R500) B : 6’ h : Projected value of wiper insert l Effects of having wiper insert (example) k Integral wiper insert system Steels : 0,05 mm Al : 0,03 mm - Workpiece: GG25 common teeth only Surface roughness A system to protrude one or two 20 20 - Cutter: DPG 4100 R inserts (wiper insert) with a smooth 15 C - Insert: SPKN 1203 with HW curved edge just a little beyond the 10 - Axial run-out: 0,015 mm other teeth to wipe the milled surface. h 5 - Radial run-out: 0,04 mm Feed per one revolution f : Feed rate per revolution - (Applies to WGC, RF types etc.) - vc = 105 m/min Surface roughness f f one wiper insert 20 20 - f t = 0,29 mm/tooth 15 (1,45 mm/rev) D with HC 10 C : Only normal teeth Technical Guidance HW 5 D : with 1 wiper insert Hc : Surface roughness with only normal teeth Hw : Surface roughness with wiper insert N8