Общий каталог Sumitomo 2018 - 2019 - страница 560

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ShapeApplication ConditionInfluence factor Depth of cut (mm)Side cutting edge angleNose radius (mm) Technical Guidance Chip Control Type of Chip Generation Type of Chip Control a b c d Feed rate A B C D E Large feed rate Continuous chips Chip is sheared Chips appear to Chips crack before Small feed rate with good surface and separated by be torn from the reaching the cutting finish. the shear angle. surface. point. NC lathe(For automation)5 5 Steel, Stainless steel Steel, Stainless steel(Low speed)Steel, Cast iron (Very lowspeed, very small feedrate)Cast iron, CarbonGeneral lathe(For safety)5 ~ 5 Easy Work deformation Difficult Good : C type, D type LargeSmallFast Rake angleD.O.C.Cutting speed SmallLargeSlow Poor { A typeB typeE type:::Twines around the tool or workpiece, damages the machined surfaceand affects safety.Bulky, causes problems in the automatic chip conveyor and chippingoccurs easily.Causes spraying of chips, poor machined surface due to chattering, chipping, large cutting force and high temperatures. Factor of Improvement Chip Control j Increase feed rate 4,0 t1 t2>t1 f1 f2>f1 2,0 When feedrate increase, chips become 0,1 0,2 0,3 0,4 0,5 thick and chip control improves. Feed rate (mm/rev) k Decrease side cutting edge 1 2< 1 45° t1 t2>t1 f f 15° Even if feed rate is the same, smaller side cutting edge angle makes chips thick and chip control improves. 0,2 0,25 0,3 0,35 Feed rate (mm/rev) l Decrease nose radius t1 r1 r2 < r1t2 1,6 t2>t1 f f 0,8 Even if depth of cut is the same, smaller nose radius makes chip thick and chip control improves. * Cutting resistance increases in proportion with the width of the contact surface. Therefore, with 0,4 a larger nose radius, cutting resistance and back force increases, chattering may also occur. However, with the same feedrate, a smaller nose 0,2 0,25 0,3 0,35 radius would produce a poorer surface finish. Depth of cut (mm) N5 Guidance Technical