Общий каталог Tungaloy 2020 - 2021 - страница 1668

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Parts for ToolsTechnicalReference Scratch marks on the toolInappropriate hole accuracyChip controlOthers User’s Guide - Technical Reference Drilling To o l s Tr o u b l e s h o o t i n g for indexable drills Problem Cause Countermeasure Misalignment of workpiece rotation ¡Set the misalignment to 0 ~ 0.2 mm. Offset machining in excess of allowable range ¡Use the tool in the allowable offset range. Offset direction reduced diameter of workpiece ¡Set offset direction extended diameter of workpiece ¡Flatten the entry surface in pre-machining. No flatness of the entry surfaceThe tool periphery¡Set the feed for lower than 0.05 mm/rev in rough surface area. Chipping of peripheral cutting edge ¡Exchange the insert. Bend of workpiece ¡Change to the clamp method with rigidity. ¡Increase the cutting speed by 20 % and lower the feed by 20 % within standard conditions. Chip packing ¡Raise the fluid pressure (for higher than 1.5 MPa). Misalignment for workpiece rotation ¡Set the misalignment to 0 ~ 0.2 mm. Inappropriate offset contents ¡Adjust offset contents. Hole diameter ¡Flatten the entry surface in pre-machining. No flatness of the entry surface ¡Set the feed for lower than 0.05 mm/rev at rough surface area. Bend of workpiece ¡Change to the clamp method with rigidity. ¡The concentration of cutting fluid must be higher than 5 %. Varieties and supply of cutting fluid ¡Use the cutting fluid superior in lubricity. Roughness ¡Change to internal cutting fluid supply from external one. ¡Increase the cutting speed by 20 % within standard conditions. Inappropriate cutting conditions ¡Lower the feed by 20 % within standard conditions. Failures of inserts ¡Exchange the insert. Common Chip packing ¡Increase the cutting speed by 20 % and lower the feed by 20 % within standard conditions.¡Raise the fluid pressure (for higher than 1.5 MPa). Looseness of screws ¡Tighten the screw. ¡Work within standard conditions. Inappropriate cutting conditions ¡Increase the cutting speed by 10 % within standard conditions. ¡Increase the feed by 10 % within standard conditions. Failures of inserts ¡Exchange inserts. Prolonged and ¡Change to internal cutting fluid supply from external one. twisted of chips Machining by external fluid supply ¡Work by step feed. ¡Use dwell function for 0.1 sec approximately. ¡There is a tendency to shorten the chips when shifting to higher Chips around the central cutting edge speed and feed. ¡Change to internal cutting fluid supply from external one. Fluid supply ¡Raise the fluid pressure (for higher than 1.5 MPa). Chip packing ¡Increase the cutting speed by 20 % and lower the feed by 20 % within standard conditions. Inappropriate cutting conditions ¡Raise the fluid pressure (for higher than 1.5 MPa). Common Large failure of drill holders ¡Exchange the drill holder. Looseness of screws ¡Tighten the screw. ¡Lower the cutting speed by 20 % within standard conditions. Inappropriate cutting conditions ¡Increase the feed by 10 % within standard conditions. Large wear of inserts ¡Exchange the insert. Chatter ¡Change to the machine with higher torque rigidity. Vibration in drilling ¡Change to the clamp method with rigidity. ¡Change the drill setting method. Looseness of screws ¡Tighten the screw. Insufficient machine power and torque ¡Use the range of number of revolutions suited machine spec. Lower the feed by 20 ~ 50%. ¡Exchange inserts before the failure becomes larger. Machine stop ¡Check the oil-hole plug screw is tightly screwed in place. Burned inserts ¡Check that the fluid flows powerfully from the drill. ¡Lower the cutting speed and the feed by 20 % within standard conditions. Failures of insertsLarge burr ¡Exchange the insert. Inappropriate cutting conditions ¡Lower the feed by 20 ~ 50% just before leaving from the workpiece. L080 www.tungaloy.com