Общий каталог Tungaloy 2020 - 2021 - страница 1657

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GradeInsertExt. ToolholderInt. ToolholderThreadingGroovingMiniature toolMilling cutterEndmillDrilling toolTooling SystemUser's GuideIndex User’s Guide - Technical Reference A Drilling To o l s Guidelines for correct usage of carbide drills᭹ Holders for solid carbide drills:OK B A collet chuck holder is recommended for use with carbide drills. When using a milling chuck holder, acollet chuck with a straight shank or straight colletshould be used. C Collet chuck Drill chuck D ᭹ Chucking drills: OK Radial run out and lip height should beless than 0.02mm. If run out or lip heightis larger (close to 0.05mm), machining is E possible. However, less accurate holes or short tool life may be a result. Run out ”0.02 mm Overhang length should be as short aspossible. F ”0.02 Clamp the chuck Longer Do not chuck on the shank overhang than the flute. Lip height ”0.02 mm and ensure the required overhang is as is not short as possible. recommended. G ᭹ Coolant Supply: External supply Internal supply When using a drill without a coolant hole,such as the DSW-DE type, coolant shouldVerticalHorizontal Through the Throughrotating holderthe spindlealways be directed to the entrance of theH hole. Maintaining this supplying is very important for stable drilling performance. External coolant should be Coolant pressure: 0.5 - 2.0 MPasupplied at high pressure and(Air pressure for MQL: 0.3 - 0.5I directed at the hole entry point. MPa) ᭹ Clamping workpieces:As solid carbide drills have a higher thrust J force, machining with low rigidity orinadequate support can cause fractures orbreakages through vibration. It is importantthe workpiece is rigidly clamped and hasVibration ordeflectionAdequate supportfor preventingdeflectionK adequate support. ᭹ The criteria of tool life:Corner wear width: equal to margin width L Feed mark: 1 - 2 feed marks on the margin Spindle load increase: 30% higher thanstarting level Corner wear width= margin width M Irregular situation: worse chip control, hole diameter change, worse surface finish,larger burrs, bigger sound. Feed mark = 1 - 2 feed marks Tungaloy L069