114 Каталог HOFFMANN GROUP 2016 Станочный режущий и вспомогательный инструмент Вер. 47 Стр.114

Каталог HOFFMANN GROUP 2016 Режущий инструмент и оснастка Стр. 114 0114 ENG Lab2u

Hoffmann Group 47 The Garant deep-hole drilling system up to 50 x D Process-reliable deep-hole drilling in 4 working steps Pre-condition: Face milling At right angles to the hole axis, with the lowest possible surface roughness. 1. Centring NC spotting drill with 142° point for exact location. NC spot drilling is always advisable for process reliability. (121068-121111) 2. Pilot hole Minimum drilling depth (depends on the desired deep-hole drill) according to depth table. The use of a pilot hole eases the subsequent deep-hole drilling operation and improves the tool life of the deep hole drill. The generation of a pilot hole is a necessary part of the production technique. It ensures process reliability and reduces the costs. for deep-hole drilling 16-30xD for deep-hole drilling 40 - 50xD Depth table 3. Machining a counterbore Vertical machining: A counterbore is recommended but is not absolutely necessary if a centre bore has been drilled. 1. Step 2. Step Co-pilot hole drilling up to 20xD Horizontal machining: After drilling the pilot hole, apply a 90° or 60° countersink. Deep-hole drills Pilot hole (minimum drilling depth) 12xD (123178/123180/123212/ 123301/123306) 3xD (122606/122736) (or centre with NC spatting drill 142°) 16xD (123588/123688) 4xD (122606/122736) (or centre with NC spotting drill 142°) 20xD (123590/123690) 6xD (122606/122736) 25xD (123593/123693) XD (122606/122736) 30xD (123595/123695) 6xD (122606/122736) 40xD (123740) 6xD and 20xD (122736/123691) 50xD (123750)