671 Каталог ISCAR 2017 Вращающийся режущий инструмент и инструментальная оснастка Стр.667

Каталог ISCAR 2017 Ротационный инструмент Стр. 667 0671 ENG Lab2u

ISCAR USER GUIDE Drilling Tolerances Obtainable In Deep Hole Drilling Deep Drilling Tolerances Gundrill configurations when used under recommended When operating under optimal conditions, conditions can produce holes with tolerances of IT8-IT9. even better tolerances can be achieved. Nonferrous materials i Aluminum A Tool steel i Cast iron Machinability M High alloy steel>800N/mm2 of Hardened steel Metals Low alloy steel<800N/mm2 Carbon steel Sintered steel Drilling quality IT 13 12 11 10 9 8 7 6 5 Tolerance range under normal conditions Tolerance range under optimal conditions Surface Quality Surface quality of 0.2 Ra can be achieved when using gundrills under recommended conditions. Indexable Drills r TT m TTTT N12 N11 N10 N9 N8 N7 N6 N5 N4 N3 N2 N1 Reaming Honing 1 1 Deep drilling Degree of roughness ii m 50 25 12.5 6.30 3.20 1.60 0.80 0.40 0.20 0.10 0.05 0.025 (Ra roughness index) ii in 2000 1000 500 250 125 63 32 16 8 4 2 1 Tolerance range under normal conditions Tolerance range under optimal conditions Concentricity and Straightness The resulting quality depends on different factors such as: Drilling depth and diameter Type of machining and cutting parameters Quality and uniformity of the workpiece material Machine tool conditions Gundrill support Concentricity Circularity The geometric quality of bores obtained from deep hole drill bits is clearly higher than that obtained with the use of twist drills. It is possible to obtain precision with deviations of less than 4pm. Straightness Drilling Depth Stationary workpiece - rotating tool Rotating workpiece - stationary tool 667 GUNDRILLS