1081 Каталог KORLOY 2016 Металлорежущий инструмент и станочная оснастка ENG Стр.L14

Каталог KORLOY 2016 Инструмент и оснастка Стр. L14 1081 ENG Lab2u

Turning The affects of cutting condition The most desirable machining means short machining time, long tool life and good precision. This is the reason that proper cutting condition for each tools should be selected according to material’s properties, hardness, shapes, the efficiency of machine. Cutting speed NC3030 NC3120 Workpiece S45C (180HB) NC3010 Tool life criterion VB=0.2mm \ \ \ \ \ \ \ \ Low grade IZ \ \ Depth of cut: 1.5mm Feed 0.3mm/rev - Holder: PCLNR2525-M12 Insert: CNMG120408 Dry cutting High grade 20 30 40 60 100 The tool life feature of P grade 500 400 300 200 150 100 1 NC3030 NC9°20 Workpiece :STS304(200HB) PC9030 Tool life criterion VB=0.2mm Depth of cut: 1.5mm \ \ \ heed U.3mm/rev \ \ Holder: PCLNR2525-MI2 i Insert CNMG120408 \ \ Dry cutting Low grade High grade : \ \ \ 20 30 40 60 100 The tool life feature of M grade ‘ NC6110 Workpiece GC300 (180HB) NC315K Tool life criterion VB=0.2mm \ \ Depth of cut: 1.5mm \ \ Feed: 0.3mm/rev \ \ Huldei PCLNR2525-M12 \ \ Insert: CNMG120408 Dry cutting Low grade High grade \ \ 10 20 30 40 60 100 The tool life feature of K grade Cutting Speed’s effects When the cutting speed increases up to 20% in an application, the tool life respectively decreases down 50%. Although inversely, if the cutting speed increases up to 50% the tool life decreases 20%. On the other hand if cutting speed is too low (20-40m/min) Tool life shortens due to vibration. Feed The feed rate in turning means the progressed interval of a distance in a work piece within 1 revolution. The feed rate in a milling application means the table feed divided by number of teeth of cutter (feed rate per tooth). The effects of feed When the feed rate decreases the flank wear is increased. When the feed rate is too low, the tool life shortens radically. When the feed rate increases, the flank wear increases due to high temperatures, however the feed rates effects tool life less than the cutting speed. And higherfeed rates improve machining efficiency. Relationship between feed and flank wear in steel turning -0.4 0.3 cd CD 0.2 u- 0.1 0,03 0.06 0.08 0.1 0.6 i (mm/rev) Cutting condition x/ Workpiece: SNCN431 Grade:ST20 Cutting speed: 200m/min Depthofcut:1.0mm Cuttingtime: 10min 14 Depth of cut Determined by the required allowances in machining a material and the capacity the machine can tolerate. There are cutting limits according to the different shapes and sizes of the insert. v The effect of a depth of cut The depth of cut does not have a big influence on tool life. When the depth of cut is small the work piece is not cut but rather rubbed. In these cases, machine off the work hardened parts that decrease tool life. When machining a cast skin or milling scale smaller depth of cuts usually cause chipping and abnormal wear because of hard impurities in the surface of the work piece. Technical Information Relationship between depth of cut and flank wear in steel turning Cutting condition Workpiece: SNCN431 Grade: ST20 Cutting speed: 200m/min Feed: O mmtev Cuttingtime: 10min 0.03 0,05 0.1 1.0 2.03.0 Feed (mm/rev) Surface parts including mill scale Roughing Depth of c Mill scale