1273 Каталог KORLOY 2020 Инструмент и оснастка для станков по металлу Стр.L13

Каталог KORLOY 2020 Инструмент для станков по металлу Стр. L13 1273 Lab2u

Turning O 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) O 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 higher feed rates improve machining efficiency Workpiece: SNCN431 Grade: ST20 Cutting speed: 200 m/min Depth of cut: 1.0 mm Cutting time: 10 min Feed (mm/rev) O 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 Workpiece: SNCN431 Grade: ST20 Cutting speed: 200 m/min Feed: 0.2 mm/rev Cutting time: 10 min Depth of cut (mm) O 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 (Surface parts including mill scale Roughing)