Техническая информация Sumitomo - страница 18

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Technical Guidance Tool Failure and Remedies Drilling Edition ■ Troubleshooting for Drilling Failure Cause Basic Remedies Remedy Examples Excessive Wear on · Inappropriate cutting · Use higher cutting speeds. · Refer to the upper limit of the recommended conditions listed the Igetalloy Cutting Tools Catalogue. Cutting Edge conditions. · Increase feed rates. · Refer to the upper limit of the recommended conditions listed the Igetalloy Cutting Tools Catalogue. · Unsuitable cutting fluid. · Reduce pressure if using internal coolant. · 1.5 MPa or below (external coolant if hole depth is L/D = 2 or less). · Use cutting fluid with more lubricity. · Use JIS A1 grade No. 1 or its equivalent. Chisel Point · Off-center starts. · Reduce feed rate at entry point. · f=0.08 to 0.12mm/rev Chipping · Pre-processing to ensure flat contact surface. · Use endmill to produce flat surface. · Equipment and/or work · Change cutting conditions to reduce resistance. · Increase vc and decrease f (reduce thrust). material lacks rigidity. · Improve work material clamp rigidity. · Cutting edge is too · Increase size of chisel width. · Set chisel width from 0.1 to 0.2 mm. weak. · Increase amount of honing on cutting edge. · Make thinning section of central area 1.5x current width. Chipping On · Inappropriate drilling · Decrease the cutting speed. · Refer to the lower limit of recommended conditions listed in the Igetalloy Cutting Tools Catalogue. Peripheral Cutting conditions. · Reduce feed rate. · Refer to the lower limit of recommended conditions listed in the Igetalloy Cutting Tools Catalogue. Edge · Unsuitable cutting fluid. · Use cutting fluid with more lubricity. · Use JIS A1 grade No. 1 or its equivalent. Drill Failure · Equipment and/or work material lacks rigidity. · Improve work material clamp rigidity. · Cutting edge is too · Increase amount of honing on cutting edge. · Make peripheral cutting edge 1.5x current width. weak. · Reduce the amount of front flank angle. · Reduce the amount of front flank angle by 2° to 3°. · Peripheral cutting edge starts cutting first · Increase margin width (W margin). · Increase margin width by 2 to 3x current width. · Cutting interrupted · Reduce feed rate. · Refer to the lower limit of recommended conditions listed in the Igetalloy Cutting Tools Catalogue. when drilling through · Increase amount of honing on cutting edge. · Make peripheral cutting edge 1.5x current width. workpiece. · Reduce the amount of front flank angle. · Reduce the amount of front flank angle by 2° to 3°. Margin Wear · Inappropriate drilling conditions. · Decrease the cutting speed. · Refer to the lower limit of recommended conditions listed in the Igetalloy Cutting Tools Catalogue. · Unsuitable cutting · Use cutting fluid with more lubricity. · Use JIS A1 grade No. 1 or its equivalent. fluid. · Increase coolant supply. · If using external coolant, change to internal coolant supply. · Latent margin wear. · Early regrind to ensure adequate back taper. · Regrind margin damage to 1 mm or less. · Unsuitable tool design. · Increase amount of back taper. · Make back taper 0.5/100. · Reduce margin width. · Decrease margin width to two-thirds of current width. Drill Breakage · Chip build-up. · Use optimal cutting conditions and tools. · Refer to the table of recommended conditions in the Igetalloy Cutting Tools Catalogue. · Increase coolant supply. · If using external coolant, change to internal coolant supply. · Collet clamp lacks strength. · Use collet with strong grip force. · Replace collet chuck if damaged. · Use collet holder one size bigger. · Equipment and/or work material lacks rigidity. · Improve work material clamp rigidity. Oversized Holes · Reduce feed rate at entry point. · f=0.08 to 0.12mm/rev · Off-center starts. · Decrease the cutting speed. · Refer to the lower limit of recommended conditions listed in the Igetalloy Cutting Tools Catalogue. Unsatisfactory Hole Accuracy · Pre-processing to ensure flat contact surface. · Use endmill to produce flat surface. · Drill bit lacks rigidity. · Use optimal drill type for hole depth. · Refer to the Igetalloy Cutting Tools Catalogue. · Improve overall rigidity of drill. · Large web with comparatively small flute. · Drill bit has run-out · Improve drill clamp precision. · Replace collet chuck if damaged. · Improve drill clamp rigidity. · Use collet holder one size bigger. · Equipment and/or work material lacks rigidity. · Improve work material clamp rigidity. Poor Surface Finish · Inappropriate cutting · Increase cutting speeds. · Refer to the upper limit of the recommended conditions listed the Igetalloy Cutting Tools Catalogue. conditions. · Reduce feed rate. · Refer to the lower limit of recommended conditions listed in the Igetalloy Cutting Tools Catalogue. · Unsuitable cutting fluid. · Use cutting fluid with more lubricity. · Use JIS A1 grade No. 1 or its equivalent. Holes Are Not · Off-center starts. · Increase feed rates. · Refer to the upper limit of the recommended conditions listed the Igetalloy Cutting Tools Catalogue. Straight · Drill is not mounted · Improve drill clamp precision. · Replace collet chuck if damaged. N properly. · Improve drill clamp rigidity. · Use collet holder one size bigger. · Equipment and/or work · Improve work material clamp rigidity. Technical Guidance / material lacks rigidity. · Select a double margin tool. · Refer to the Igetalloy Cutting Tools Catalogue. References Unsatisfactory Chip Control Packing Of Chips · Inappropriate drilling · Increase cutting speeds. · Refer to the upper limit of the recommended conditions listed the Igetalloy Cutting Tools Catalogue. conditions. · Increase feed rates. · Refer to the upper limit of the recommended conditions listed the Igetalloy Cutting Tools Catalogue. · Poor chip evacuation. · Increase the amount or pressure of coolant applied if using internal coolant. Long Stringy Chips · Inappropriate drilling · Increase feed rates. · Refer to the upper limit of the recommended conditions listed the Igetalloy Cutting Tools Catalogue. conditions. · Increase cutting speeds. · Refer to the upper limit of the recommended conditions listed the Igetalloy Cutting Tools Catalogue. · Cooling effect is too strong. · Reduce pressure if using internal coolant. · Keep pressure 1.5 MPa or lower if using internal coolant. · Dull cutting edge. · Reduce amount of edge honing. · Reduce to around two-thirds of current width. N26