Каталог Iscar сверла ружейные и для глубокого сверления 2022 - страница 115

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Single Flute GundrillSingle Flute Solid Carbide Gundrills
Iscar's gundrill consists of a single-piece carbide head,Another type of gundrill is made with an integral tip and
a streamlined shank and a driver through which coolantshank, made of solid carbide with either a steel or a
flows to the working end where it is most needed. Chipscarbide driver. These drills are designed for conventional
are evacuated along the V-shaped external flute.machines, machining centers and lathes. This style of
gundrill is available from 0.9-16 mm and can be used on
Drilling Headvarious types of materials. It provides superior rigidity and
The carbide head is tapered on its length to reduceoptimal coolant flow rates. As a result of its rigidity, up to
friction. The taper angle depends on the type of material100% higher feed rate can be reached.
to be drilled. For high precision drilling, the taper should beWhen using the small diameter drills, it is crucial to
reduced to a minimum.adhere closely to the recommended drilling parameters.
Note that when the head is resharpened, the diameter
of the drill changes, affecting the hole tolerance.Solid Carbide Gundrill Range

(with or without brazed steel driver)

Drill Diameter Max. Flute Length
0.9 to 16.00 300 mm

The cross-section of the shank is V-shaped with coolant holes. It is made of hardened steel that is highly resistant to twisting. This cross-section provides the optimal conditions for twist Standard Gundrill Head Sharpening Angles Subject to the required tolerance, cutting performance resistance, coolant flow and chip evacuation. and desired chip shape, the following standard sharpening Driver angles are recommended (shown in figures 1 and 2).

The driver ensures the connection between 1 Standard sharpening for 0.9 to 4 mm drill diameters

the gundrill and the machine tool, (see page 301 for detailed driver information). Advantages

  • Drilling precision of IT7 to IT9 tolerances can be reached
  • Excellent straightness and concentricity 30˚
  • Maintains high precision hole center alignment 30˚
  • Surface roughness of R0.4 - R1.6 is easily obtained 15˚
  • Reboring operations are often unnecessary 40˚

30˚ 35˚

Carbide Tipped Gundrill Range

0.25xD

Drill DiameterMax. Flute Length
2.50 to 3.091100
3.10 to 5.992500
6.00 to 11.393000
11.40 to 40.003500

2 Standard sharpening for 4 to 32 mm drill diameters

Overall length=flute length+driver length (see page 303)

Shank

Driver

.5 -0 12˚ 0.3 30˚ 20˚ 12˚ 30˚ 20˚ 25˚

0.25xD D 3 Standard sharpening for 32 to 40 mm drill diameters

Drilling Head 20° 12° 0,3/0,5 ’ 25°

Iscar s advanced gundrill technology provides 20° 20°

15° 12° superior geometric and dimensional quality for 25° D/4 ±0,05 both deep and shallow drilling. The drills are

Ø Dh5 available in the range of 2.5 to 40 mm. Note: For special or semi-standard gundrills, special geometries will be offered to match the application.