Каталог Iscar сверла со сменной режущей частью 2022 - страница 93

INDEXABLE DRILLS USER GUIDE Troubleshooting Cutting Edge Chipping 1 Check the stability of the machine spindle, tool and workpiece clamping rigidity. 2 Reduce feed rate, increase speed. 3 If the drill vibrates, reduce cutting speed and increase feed rate. 4 When drilling rough, hard or sloped surfaces (up to 7°), reduce the feed rate by 50-70% when entering and exiting. 5 Check cooling lubricant and increase coolant pressure. In case of external coolant supply, improve jet direction and add cooling jets. Chisel Area Chipping 1 Reduce feed rate. 2 Increase coolant pressure. 3 Increase workpiece chucking force. Excessive Flank Wear 1 Reduce cutting speed. 2 Increase internal coolant pressure. Excessive Land Wear 1 Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial). 2 Reduce cutting speed. 3 When drilling rough, hard or sloped surfaces (up to 7°), reduce the feed rate by 50%-70% when entering and exiting. 4 Increase coolant pressure. 5 Check the chisel point runout and make sure it is within 0.03 mm T.I.R. 6 Increase workpiece chucking force stability and rigidity. Built-Up Edge 1 Increase cutting speed/feed. 2 Increase coolant pressure. Deviation of Hole Tolerance Ø > D nominal + 0.15mm 1 Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial cutting points). D nominal 2 Reduce feed rate. Ø < D nominal - 0.03mm 3 Check the chisel point runout and make sure it is within 0.03 mm T.I.R. 4 Worn cutting edge. Replace head. 5 Increase workpiece chucking force. 6 Increase internal coolant pressure. Surface Finish Too Rough Ra 1 Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial). 2 Adjust the feed for improved chip formation. 3 In case of chip jamming - increase the coolant flow and/or reduce the cutting speed. 4 Increase the coolant pressure. 5 Check the chisel point runout and make sure it is within 0.03 mm T.I.R. 6 Use pecking cycle. 7 Replace the drilling head Hole Not Straight 1 Drill a pre-hole for centering (check recommendations for pre-hole operation). 2 Increase coolant pressure, improve jet direction in case of external coolant supply. 3 Increase the feed. Inaccurate Hole Position 1 Check the runout and make sure it is within 0.03 mm T.I.R. (radial and axial). 2 Check the stability of the machine spindle, tool and workpiece clamping rigidity. 3 When drilling rough, hard or sloped surfaces (up to 7°), reduce the feed rate by 50%-70% when entering. 4 Drill a pre-hole with a 140° point angle for centering. 5 Check the chisel point runout and make sure it is within 0.03 mm T.I.R. Burrs on Exit 1 Reduce the feed rate by 50%-70% when exiting. 2 Replace the worn head. 91