637 Каталог KYOCERA 2017 Инструмент сборный и монолитный для станков Стр.K80

Каталог KYOCERA 2017 Инструмент режущий Стр. K80 0637 Lab2u

K DRA DRC DRV DRS DRZ DRX DRW Fine Micro Q&A Q-1 Q-2 Is it possible to use external coolant External coolant is not recommended because the amount of chips will be enormous. Use internal coolant. See the graph of “Drill diameter and coolant amount" What level of spindle output is required Higher output is preferable. What is important is enough torque rather than high spindle rate. See the examples of required power as below. Drill diameter and coolant amount A-1 -2 Drill Dia. Workpiece Material Обрабатываемый материал Machine Cutting Conditions Spindle Power ‘Required Power 4>75 (2D) SCM415 M/C Vc=130m/min (n=550min-1) f=0.12mm/rev (Vf=66mm/min) 22kW 60% 4>85 (2D) SCM M/C Vc=150m/min (n=560min-1) f=0.1mm/rev (Vf=56mm/min) 30kW 85% 4>94 (2D) S45C NC Lathe Vc=120m/min (n=410min-1) f=0.1mm/rev (Vf=41mm/min) 20kW 100% 4>94 (2D) SUS304 NC Lathe Vc=80m/min (n=270min-1) f=0.2mm/rev (Vf=54mm/min) 20kW 40% The required power was read on the load meter. Q-3 The workpiece material is elastic and the chips are stretched and tangled. Is there any countermeasure When chips of elastic material are stretched and tangled, try “low rate + large feed" “high rate + small feed” or other settings. Chips are usually stretched well between the inlet and 10mm inside, and not any more stretched further inside. Therefore charging the condition of entrance only will also be effective. Low cutting speed + Large feed This setting makes the chips thicker so that they easily break off. E.g. Vc=80 m/min, f=0.2 to 0.25 mm/rev High cutting speed + Small feed This setting makes the chips thinner and uses centrifugal force to cut them off. E.g. Vc=200m/min, f=0.07 to 0.09mm/rev Step machining at inlet E.g. Inlet to 10 mm deep: 1 mm step drilling E.g. 10 mm deep or more: Vc=150 m/min, f=0.15 mm/rev (Continuous drilling) Q-4 Chattering occurs. Is there any countermeasure Chattering usually occurs during chamfering and when the feed rate per revolution is not high enough. Try changing the cutting conditions as follows. Increase the feed rate if it is small. If the feed rate is f=0.06 mm/rev, for example, increase it to f=0.08 to 0.12 mm/rev. Increasing the feed rate will improve chamfering and thus prevent chattering. If the cutting speed is too high, lower it to Vc=100 to 150 m/min. If the chamfering point and pass-through point are not plain, or if the workpiece clamping rigidity is low, lower the feed rate to f=0.07 to 0.08 mm/rev. If chattering occurs on the full contact surface (e.g. during step drilling), make adjustments by increasing the feed rate during chamfering or lowering the cutting speed. Once chattering occurs during chamfering, it will continue through drilling. J K80