1083 Каталог KORLOY 2016 Металлорежущий инструмент и станочная оснастка ENG Стр.L16

Каталог KORLOY 2016 Инструмент и оснастка Стр. L16 1083 ENG Lab2u

Turning End cutting edge angle It affects machined surface to prevent interference between surface of workpiece and insert. Affects 1. If end cutting edge angle reduces cutting edge get stronger but cutting heat generated by machining increases. 2. Small end cutting edge angle can cause chattering due to the increases cutting force. Nose-R 1. Nose-R affects not only surface roughness but strength of cutting edge. 2. In general, It’s desirable that Nose-R is 2 3 times bigger than feed. Nose R and surface finish Surface finish( ) Nose-R(mm) Workpiece: SNCM439, HB200 Grade: P20 vc = 120m mn, ap = 0.5mm Nose R and tool life Tool life(the number of impact) Workpiece SCM440, HB280 Grade: P10 vc = 100m rtn, ap = 0.5mm fn = 0.3mm/rev Nose R and wear of tool Nose-R(mm) Workpiece: SNCM439, HB200 Grade: P10 vc = 140m/min, ap = 2mm fn = 0.2mm/rev, T = 10min Affects of Nose-R 1. Big Nose-R improves surface finish. 2. Big Nose-R improves cutting edge strength. 3. Big Nose-R reduces flank wear and crater wear. 4. Too big Nose-R causes chattering due to increased cutting force. Selection system 1. For finishing with small depth of cut / long and thin workpiece / When machine power is low - Small Nose-R 2. For applications that need strong cutting edge such as intermittent and machining mill scale / For roughing of big workpiece / When the machine power is strong eough - Big Nose-R III IJ \J _v=4 I 3, Small Corner Radius 1 \ Large Comer Radius Relationship between nose radius, feed and various surface roughness. Technical Information 16