683 Каталог INGERSOLL 2011 Режущий инструмент и инструментальная оснастка Стр.685

Каталог INGERSOLL 2011 Инструмент и оснастка Стр. 685 0683 Lab2u

PRODUCTIVITY TIPS GENERAL APPLICATION INFORMATION QuadDrills are One-Effective. Indexable drills are one-effective cutting geometry regardless of the number of inserts in the tool. This is extremely important when establishing feeds and speeds for a given operation. Rigidity. A high degree of rigidity of the machine and fixturing is critical for indexable drilling. Spindle Rigidity. If the spindle is not tight or properly adjusted the drill will cut off-center producing oversize holes. Insert chipping or low tool life may also result and hole finish will be affected. Fixture Rigidity. Workpiece strength is essential. Flimsy or inadequately supported workpieces will render indexable drills virtually ineffective. Chip Control. Chip control is essential for indexable drilling. Proper chip control directly enhances chip evacuation which extends tool life and improves hole tolerance and finish (see Fig. 2). Large long chips will restrict the flutes' capacity to evacuate chips and cause insert chipping and possible drill failure. Operating parameters should be adjusted to fall within recommended guidelines to achieve optimum form or figure9 chips that can successfully evacuate along the drill flutes. Coolant. In drilling heat and chips are generated in a confined area at the bottom of the hole. Coolant must be used as a carrier to extract heat and chips from the bottom of the hole along the drill flutes and out of the hole. Through the tool water base or synthetic coolant is strongly recommended. Do not operate indexable drills over 1:1 diameter to length ratios with air air mist or dry. Running drills under those conditions can result in drill failure. Fig. 2: Chip Formation Optimum form Too tight: Increase speed within recommended limit. If unsatisfactory decrease feed. Too long: May clog drill flutes. Reduce speed or increase feed within recommended limits. HOLE TOLERANCE Drilling Depth Hole Tolerance (inch)