Pferd drilling and countersinking tools Pagina 4
Commercieel klantenaanbod**Beste verkopers van PFERD
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Drilling tools HSS spiral drills Fully ground spiral drill with cross grinding PFERD drills are completely ground spiral drills: they are precision ground both in the chip flute and the guide chamfer as well as at the drill tip. They also have cross grinding. This drill is suitable for highly precise positioning on the workpiece and supports centring during drilling. This grinding finish even cuts at the centre of the drill tip and reduces the feed forces during use. Spiral drills with cross grinding are suitable for purposes including machining of difficultto-machine materials like chromium-nickel steel. Recommended rotational speed range [RPM] To determine the recommended cutting speed range [m/min], please proceed as follows: ➊ Select the material group to be machined. ➋ Select the type. ➌ Establish the cutting speed range. To determine the recommended rotational speed range [RPM], please proceed as follows: ➍ Select the required diameter. ➎ The cutting speed range and the diameter determine the recommended rotational speed range. ➊ Material group Steel, cast steel Stainless steel (INOX) Non-ferrous metals Cast iron Plastics, other materials Steels up to 700 N/mm² (< 220 HB) Construction steels, carbon steels, tool steels, alloyed and non-alloyed Steels steels, case-hardened steels, cast steel over 700 N/mm² (> 220 HB) ➋ Type ➌ Cutting speed STEEL 25–35 m/min STEEL INOX 20–25 m/min Rust and acid-resistant steels Austenitic and ferritic stainless steels INOX 10–20 m/min Soft non-ferrous metals Aluminium alloys Brass, copper, zinc STEEL INOX 30–60 m/min Hard non-ferrous metals Bronze, titaniumium/titanium alloys, hard aluminium alloys (high Si content) Grey cast iron, white cast iron Cast iron with flake graphite EN-GJL (GG), with nodular graphite/nodular cast iron EN-GJS (GGG), white annealed cast iron EN-GJMW (GTW), black cast iron EN-GJMB (GTS) Fibre-reinforced thermoplastics and duroplastics, hard rubber, wood STEEL INOX 25–50 m/min STEEL 10–25 m/min INOX STEEL INOX 15–40 m/min 4
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