666 Каталог ISCAR 2017 Вращающийся режущий инструмент и инструментальная оснастка Стр.662

Каталог ISCAR 2017 Ротационный инструмент Стр. 662 0666 ENG Lab2u

GUNDRILLS USER GUIDE ISCARGUNDRSLL3 Single Flute Gundrill ISCAR's gundrill consists of a single piece carbide head, a streamlined shank and a driver through which coolant flows to the working end where it is most needed. Chips are evacuated along the V-shaped external flute. Drilling Head The carbide head is tapered on its length to reduce friction. The taper angle depends on the type of material to be drilled. For high precision drilling, the taper should be reduced to a minimum. Note that when the head is resharpened, the diameter of the drill changes, affecting the hole tolerance. Shank 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 resistance, coolant flow and chip evacuation. Driver The driver ensures the connection between the gundrill and the machine tool, (see page 664 for detailed driver information). Advantages Drilling precision of IT7 to IT9 tolerances can be reached Excellent straightness and concentricity Maintains high precision hole center alignment Surface roughness of R0.4 - R1.6 is easily obtained Reboring operations are often unnecessary Carbide Tipped Gundrill Range Drill Diameter Max. Flute Length 2.50 to 3.09 1100 3.10 to 5.99 2500 6.00 to 11.39 3000 11.40 to 40.00 3500 Overall length=flute length+driver length (see page 666) ISCAR's advanced gundrill technology provides superior geometric and dimensional quality for both deep and shallow drilling. The drills are available in the range of 2.5 to 40 mm. Single Flute Solid Carbide Gundrills Another type of gundrill is made with integral tip and shank, made of solid carbide with either a steel or a carbide driver. These drills are designed for conventional machines, machining centers and lathes. This style of gundrill is available from 0.9-16 mm and can be used on various types of materials. It provides superior rigidity and optimal coolant flow rates. As a result of its rigidity, up to 100% higher feed rate can be reached. When using the small diameter drills, it is crucial to adhere closely to the recommended drilling parameters. Solid Carbide Gundrill Range (with or without brazed steel driver) Drill Diameter Max. Flute Length 0.9 to 16.00 300 mm Standard Gundrill Head Sharpening Angles Subject to the required tolerance, cutting performance and desired chip shape, the following standard sharpening angles are recommended (shown in figures 1 and 2). Standard sharpening for 0.9 to 4 mm drill diameters Standard sharpening for 4 to 32 mm drill diameters Standard sharpening for 32 to 40 mm drill diameters Note: For special or semi-standard gundrills, special geometries will be offered to match the application. 662 ISCAR