Page 270 - Demo

268 ISCAR DEEP HOLE DRILLINGTRI-DEEP Cutting Conditions for Gun Drilling MethodsThe main elements of the cutting conditions for deep drilling are cutting speed and feed. When drilling holes, it is important to select the right cutting conditions in which the tool will work normally, i.e., most efficiently, in order to save the tool from premature wear, taking into account maximum productivity. Recommended initial conditions are shown in the table below, according to insert size, chip breaker form and workpiece material.ISOMaterial Condition Tensile Strength [N/mm2] Hardness HB Material Group No. TOGTVm/minFeed per insert size \06 07 08 09 10 11 12 13mm/revPnon-alloy steel and cast steel, free cutting steel<0.25% C annealed 420 125 180-1200.04-0.08 0.08-0.140.04-0.10 0.08-0.160.06-0.10 0.08-0.160.06-0.10 0.08-0.160.06-0.12 0.08-0.18%u22650.25% C annealed 650 190 2<0.55% C quenched and tempered 850 250 3%u22650.55% Cannealed 750 220 4quenched and tempered 1000 300 50.04-0.12 0.06-0.20 low alloy and cast steel (less than 5% of alloying elements)annealed 600 200 6quenched and tempered930 275 71000 300 81200 350 9high alloyed steel, cast steel and tool steelannealed 680 200 100.04-0.08 0.08-0.140.04-0.10 0.08-0.160.06-0.10 0.08-0.160.06-0.10 0.08-0.160.06-0.12 0.08-0.18quenched and tempered 1100 325 11stainless steel and cast steelferritic / martensitic 680 200 12martensitic 820 240 13M stainless steel and cast steel austenitic, duplex 600 180 14 50-100 0.02-0.06 0.04-0.120.02-0.06 0.04-0.120.02-0.06 0.04-0.120.02-0.06 0.04-0.120.02-0.06 0.04-0.12Kgray cast iron (GG) ferritic / pearlitic 180 1550-100 80-1200.03-0.15 0.08-0.250.03-0.15 0.08-0.250.05-0.18 0.08-0.250.05-0.18 0.08-0.300.05-0.18 0.08-0.30pearlitic / martensitic 260 16nodular cast iron (GGG) ferritic 160 17pearlitic 250 18malleable cast ironferritic 130 19pearlitic 230 20Naluminumwrought alloysnot hardenable 60 2180-160 0.03-0.15 0.08-0.200.03-0.15 0.08-0.200.03-0.18 0.08-0.200.05-0.18 0.08-0.200.03-0.18 0.08-0.20hardenable 100 22aluminumcast alloys%u226412% Sinot hardenable 75 23hardenable 90 24>12% Si high temperature 130 25copper alloys>1% Pb free cutting 110 26brass 90 27electrolytic copper100 28non metallicduroplastics, fiber plastics 29hard rubber 30Shigh temperature alloysFe basedannealed 200 3120-50 0.08-0.14 0.08-0.16 0.08-0.16 0.08-0.16 0.08-0.16hardened 280 32Ni or Co basedannealed 250 33hardened 350 34cast 320 35