1275 Каталог KORLOY 2020 Инструмент и оснастка для станков по металлу Стр.L15

Каталог KORLOY 2020 Инструмент для станков по металлу Стр. L15 1275 Lab2u

Turning Side cutting edge angle and cutting load Side cutting edge angle and tool life fn (mm/rev) fn (mm/rev) “Force P is loaded.” 5 “Force P is scattered to P1, P2.” As approach angle gets bigger Back force gets bigger and feed force gets smaller 1 Workpiece: SCM440 Grade: P20 1 Depth of cut: 3 mm 1 Feed: 0.2 mm/rev Side cutting edge angle and cutting performance Specification udui cjiiyic M yM Wear rate High ..Low "M1 1 Workpiece Easy to cut material . ...Difficult to cut material Machining power Small Big Ollla.il .. Big Chatter I lorH to rw>r>i ir j .. .Pqov to ir Haiu to occui Easy to occui How to machine i - Finishing Roughing Workpiece rigidity . Long thin workpiece ihiUk woikpieue Machine rigidity , W , , , - , In case oi low i igiuity In case oi high ngiuiiy 9 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 O Nose-R Nose-R affects not only surface roughness but strength of cutting edge In general, It’s desirable that Nose-R is 2 3 times bigger than feed Nose R and surface finish Surface finish (n) Feed fn(mm/rev) -O 0.300 -CD-0.212 Q=-fct50- 0.4 O.l 1.2 1.6 2.0 2.4 Nose-R (mm) Nose R and tool life Tool life (the number of impact) Nose R and wear of tool Flank wear VB (mm) Workpiece: SNCM439, HB200 Grade: P20 vc: 120 m/min ap: 0.5 mm Workpiece: SCM440, HB280 Grade: P10 1 vc: 100 m/min, ap: 0.5 mm 1 fn: 0.3 mm/rev Workpiece: SNCM439, HB200 Grade: P10 vc: 140 m/min, ap: 2 mm fn: 0.2 mm/rev, T: 10 min Technical Information 15