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

GUNDRILLS USER GUIDE Single Flute Gundrill Single 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 coolant shank, made of solid carbide with either a steel or a flows to the working end where it is most needed. Chips carbide 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 Head various types of materials. It provides superior rigidity and The carbide head is tapered on its length to reduce optimal coolant flow rates. As a result of its rigidity, up to friction. The taper angle depends on the type of material 100% higher feed rate can be reached. to be drilled. For high precision drilling, the taper should be When 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) Shank Drill Diameter Max. Flute Length The cross-section of the shank is V-shaped withcoolant holes. It is made of hardened steel that is 0.9 to 16.00 300 mm highly resistant to twisting. This cross-section provides the optimal conditions for twistresistance, coolant flow and chip evacuation.Standard Gundrill Head Sharpening AnglesSubject to the required tolerance, cutting performanceand 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 Diameter Max. Flute Length D 2.50 to 3.09 11003.10 to 5.992500 2 Standard sharpening for 4 to 32 mm drill diameters 6.00 to 11.39 3000 11.40 to 40.00 3500 Overall length=flute length+driver length (see page 303) 12˚ 0.3-0.5 30˚ 20˚ 12˚ Driver 30˚20˚ 25˚ 0.25xD D 3 Standard sharpening for 32 to 40 mm drill diameters Shank Drilling Head 20° 25° 12° 0,3/0,5 Iscar’s advanced gundrill technology provides 15° 12° 20° 20° 25° superior geometric and dimensional quality for 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. 299