Режущие и зажимные инструменты Hoffmann Group 2026 - страница 83

GBP 57 Technical precision at the highest level. Reliable, general high-performance drilling in the micro-range – up to a drilling depth of 30 × D. Exactly matching tools within the overall system. Pilot hole: Deep hole drilling: 30×D For reliable deep hole … to then drill to the full depth drilling, first drill a pilot hole of of the hole of up to 30×D in the at least 4×D. second step. Pilot Central high-pressure cooling 5×D 20×D Increased coolant hole cross-section in the shank area for increased flow of coolant and maximum extended range. Top flow speed and optimum cooling over the entire shank length for all versions and sizes. at least 4×D 12×D Transition to helical coolant channel 8×D 12 1223 m6 Pilot hole of up to 2.5×D can also be drilled on inclined or curved surfaces up to an Ultra-micrograin substrate 12 angle of 50°. Optionally with 10% cobalt proportion available with an additional 90° countersink profile Specially developed for micro-machining. starting from 2.5×D hole depth. Lapped flute surface For optimum chip evacuation. Stepped pilot ØD2 12 1224 12 1226 12 1228 12 1231 2.5×D Diameter range for 160° L1 5×D: 0.75 mm – 3.00 mm; h6 8×D – 30×D: 0.80 mm – 3.00 mm Wear-resistant and ultra-smooth ØD1 AICrN-based high-performance coating αmax. 50° L1 Specially prepared and homogenised cutting edge for optimum chip shape 12 1222 160° Very precise point geometry for reliable centring behaviour m6 ØD1 Outstanding in steel and absolutely reliable UNI. Drilling trial Wear mark width (mm) 20×D in 42 CrMo4 (1.7225) 0.3 ⌀ = 2 mm Wear after number of bores Vc = 80 m/min 42CrMo4 0.25 f = 0.08 mm/rev 0.2 Competitor 1 Competitor 2 0.15 Competitor 3 V2A 0.1 Competitor 4 0.05 GARANT Master Steel MICRO 0 80 160 240 320 400 480 560 640 720 800 880 960 1040 1120 1200 Number of holes Titanium 83