Каталог Iscar сверла ружейные и для глубокого сверления 2022 - страница 120

Предыдущая страница Следующая страница

Навигация

Drilling Tolerances Obtainable In Deep Hole Drilling

Deep Drilling Tolerances

Gundrill configurations when used under recommended conditions can produce holes with tolerances of IT8-IT9. When operating under optimal conditions, even better tolerances can be achieved. Nonferrous materials Aluminum Tool steel Cast iron Machinability High alloy steel>800N/mm2 of Metals Hardened steel 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.

N12N11N10N9N8N7N6N5N4N3N2N1
Indexable Drills
Reaming
Honing
Deep drilling
Degree of roughness μ m502512.56.303.201.600.800.400.200.100.050.025
(Ra roughness index)μ in200010005002501256332168421

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 mm 1.0 0.84 0,66 0.5 0.33 0.16

500 1000 mm Drilling Depth Stationary workpiece – rotating tool Rotating workpiece – stationary tool

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 4 µm.

mm 0.05 0.04 0.03 0.02 0.01

250 500 750 mm

Drilling Depth