115 Каталог HOFFMANN GROUP 2016 Станочный режущий и вспомогательный инструмент Вер. 47 Стр.115

Каталог HOFFMANN GROUP 2016 Режущий инструмент и оснастка Стр. 115 0115 ENG Lab2u

Hoffmann Group 47 4a. Deep-hole drilling 16xD - 30xD (after pilot drilling) Positioning Implementation Vertical machining: Introduce the deep-hole drill with anti-clockwise rotation up to 0.5xD before the end of the pilot hole, without through-coolant. Horizontal machining: Position the cutting corners of the deep-hole drill vertically, at zero rotation Introduce the drill into the hole as far as 0.5xD short of the end of the pilot holewith coolant feed switched off. Drilling the deep hole: Work without a drilling cycle (no chip evacuation necessary). Switch on the through-coolant, increase the rotational speed (as smoothly as possible) to the final working value vc. When drilling a through hole, approx. 1 mm before the deep-hole drill breaks through, reduce the vf speed. Breaking through at right angles: reduce v, by 50 %. Backing out the deep-hole drill; Before backing out the deep-hole drill switch off the through-coolant and then optionally back out the drill with or without reducing the drill speed (vf = 1000). reduce vf by 40 %. Breaking through obliquely and breaking through into cross holes: 4b. Deep-hole drilling 40xD - 50xD (after pilot and co-pilot drilling) Positioning Implementation Vertical machining: Introduce the deep-hole drill with anti-clockwise rotation up to 0.5xD before the end of the pilot hole, without through-coolant. Horizontal machining: Position the cutting corners of the deep-hole drill vertically, at zero rotation Introduce the drill into the hole as far as 0.5xD short of the end of the pilot holewith coolant feed switched off. Drilling the deep hole: For deep-hole drills of 40xD / SOxD 3xD chip evacuation is necessary in each case. (Perform chip evacuation by pulling the drill back from the bottom of the hole by no more than 3xD). When drilling a through hole, approx. 1 mm before the deep-hole drill breaks through, reduce the v, speed. Breaking through at right angles: reduce v, by 50 %. Breaking through obliquely and breaking through into cross holes: reduce vf by 40 %. Backing out the deep-hole drill: Before backing out the deep-hole drill switch off the through-coolant and then optionally back out the drill with or without reducing the drill speed (vf = 1000). Safety instructions Deep-hole drills = 12xD may never be operated at vc max without pilot hole guidance. 115