Page 181 - Demo

179PRE-THREAD DRILLING WITH CHAMFERING SOLID-DRILL Cutting ConditionsThe main parameters of cutting conditions in drilling are cutting speed and feed. The value of cutting speed depends directly on the drilling depth while the value of feed directly depends on the drill diameter. The cutting conditions must be chosen in a way to save the tool from premature wear while considering maximum productivity. The table below shows the initial recommended cutting conditions.ISOMaterial Condition Tensile Strength [N/mm2]Hardness HBMaterial No.(1)Cutting Speed Vc m/minFeed (mm/rev) Vs. Drill Diameter%u00d83-5 %u00d85.1-8 %u00d88.1-12 %u00d812.1-16 %u00d816.1-20Pnon-alloy steel and cast steel, free cutting steel<0.25% C annealed 420 125 1 80-120 0.10-0.18 0.15-0.25 0.2-0.30 0.20-0.350.25-0.40%u22650.25% C annealed 650 190 2 80-110 0.10-0.18 0.15-0.25 0.2-0.30 0.20-0.350.25-0.40<0.55% C quenched and tempered 850 250 3 70-1000.10-0.20 0.15-0.28 0.2-0.35 0.20-0.380.25-0.42 %u22650.55% C annealed 750 220 4quenched and tempered 1000 300 5low alloy and cast steel (less than 5% of alloying elements)annealed 600 200 6 70-90 0.10-0.18 0.15-0.25 0.2-0.30 0.20-0.350.25-0.40quenched and tempered930 275 71000 300 8 60-80 0.10-0.18 0.15-0.25 0.2-0.30 0.20-0.350.25-0.401200 350 9 50-70 0.10-0.20 0.15-0.28 0.2-0.35 0.20-0.380.25-0.42high alloyed steel, cast steel and tool steelannealed 680 200 10 60-80 0.10-0.20 0.15-0.28 0.18-0.35 0.20-0.380.25-0.42quenched and tempered 1100 325 11 50-70 0.10-0.15 0.12-0.20 0.14-0.25 0.16-0.30 0.18-0.32stainless steel and cast steelferritic / martensitic 680 200 12 25-75 0.04-0.10 0.05-0.15 0.05-0.18 0.08-0.20 0.10-0.20martensitic 820 240 13 25-75 0.04-0.10 0.05-0.15 0.05-0.18 0.08-0.20 0.10-0.20M stainless steel and cast steel austenitic, duplex 600 180 14 25-75 0.04-0.10 0.05-0.15 0.05-0.18 0.08-0.20 0.10-0.20Kgray cast iron (GG) ferritic / pearlitic 180 15 85-105 0.15-0.25 0.20-0.350.25-0.450.30-0.500.35-0.55pearlitic / martensitic 260 16 75-90 0.15-0.25 0.20-0.350.25-0.450.30-0.500.35-0.55nodular cast iron (GGG) ferritic 160 1765-80 0.12-0.20 0.15-0.25 0.20-0.350.25-0.400.30-0.45 pearlitic 250 18malleable cast iron ferritic 130 19pearlitic 230 20Naluminum-wrought alloys not hardenable 60 21 70-300 0.10-0.25 0.15-0.35 0.25-0.450.30-0.500.35-0.55 hardenable 100 22 70-200aluminumcast alloys%u226412% Si not hardenable 75 23 70-300 0.07-0.18 0.12-0.25 0.20-0.350.25-0.450.30-0.50hardenable 90 24>12% Si high temperature 130 25copper alloys>1% Pb free cutting 110 26brass 90 27electrolytic copper 100 28non metallic duroplastics, fiber plastics 29hard rubber 30Shigh temperature alloysFe based annealed 200 31hardened 280 32Ni or Co basedannealed 250 33hardened 350 34cast 320 35titanium alloyspure RM 400 36alpha+beta alloys, hardened RM 1050 37 15-35 0.02-0.07 0.04-0.10 0.06-0.12 0.08-0.15 0.08-0.18Hhardened steel hardened 55 HRC 38 40-70 0.06-0.10 0.08-0.12 0.10-0.14 0.12-0.16 0.14-0.18hardened 60 HRC 39chilled cast iron cast 400 40cast iron hardened 55 HRC 41As a starting value, the middle of the recommended machining range should be used, then (according to wear results), conditions can be changed in order to optimize performance.%u2022 When using external coolant supply only, reduce cutting speed by 10%%u2022 Use internal coolant supply when machining austenitic stainless steel