Общий каталог Tungaloy 2020 - 2021 - страница 1670

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Parts for ToolsTechnicalReference Hole accuracy Rough surface finishUnacceptable circularity, cyndricity,and oversizeBending of hole User’s Guide - Technical Reference Drilling To o l s Tr o u b l e s h o o t i n g in gun drilling Problem Cause Trigger Countermeasure Clamping the workpiece is unstable. Clamp the workpiece firmly. The type of coolant is not appropriate. Use water-insoluble coolant. Foreign material is in the coolant. Thoroughly filtrate the coolant (Use a filterwith the filtration accuracy in 10µm or less). Machine The run-out of the spindle is too large. Minimize the run-out of the spindle. The clearance between the guide bush Replace the guide bush (The clearance and the drill is not appropriate. should be between +0.003 and +0.008). The feed speed (Vf) varies. Use mechanical feed. The number of revolutions varies Increase the machine power or adjust the (decreases). cutting conditions. Abnormal damage occurs. See “Short tool life” for the details. Drill Make sure no damage is left on the drill Regrinding is in poor quality. and that the cutting edge geometry is not changed. Cutting condition The feed (f) is too high. Reduce the feed. Others Chip packing occurs. See “Chip packing” for the details. The clearance between the guide bush Replace the guide bush (The clearance and the drill is not appropriate. should be between +0.003 and +0.008). The guide bush is apart from the Contact the guide bush closely with the Machine workpiece surface at the entry. workpiece. The type of coolant is not appropriate. Use water-insoluble coolant. The concentricity of the guide bush and Decrease the concentricity of the guide the spindle is too large. bush and the spindle. Abnormal damage occurs. See “Short tool life” for the details. Drill Make sure no damage is left on the drill Regrinding is in poor quality. and that the cutting edge geometry is not changed. Cutting condition The feed (f) is not suitable. Use an appropriate feed. Workpiece Interrupted or cross drilling is required. Change the tool to a standard gundrill. Others Chip packing occurs. See “Chip packing” for the details. Clamping the workpiece is unstable. Clamp the workpiece firmly. The guide bush is apart from the Contact the guide bush closely with the workpiece surface at the entry. workpiece. Machine The concentricity of the guide bush and Decrease the concentricity of the guide the spindle is too large. bush and the spindle. The clearance between the guide bush Replace the guide bush (The clearance and the drill is not appropriate. should be between +0.003 and +0.008). The selection of the guide pads is notsuitable. Use 2 guide pads instead of 3. Drill Make sure no damage is left on the drill Regrinding is in poor quality. and that the cutting edge geometry is not changed. Cutting condition The feed (f) is too high. Reduce the feed. The workpiece has blow holes orunevenness. Use the workpiece without defect. Workpiece The workpiece surface is slanted at theentry. Use low feed. Interrupted or cross drilling is required. Change the tool to a standard gundrill. L082 www.tungaloy.com