Техническая информация Sumitomo - страница 22

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Technical Guidance Tool Failure and Remedies SUMIBORON Edition Type of Insert Failure Cause Countermeasures Flank Wear · Grade lacks wear resistance. · Select a more wear resistant grade. （BNC2010,BN1000,BN2000） · Cutting speed is too fast. · Decrease the cutting speed. Reduce the cutting speed to less than vc=200m/min. (Higher feed rate reduces the overall tool-to-work contact time.) · Use an insert with a larger relief angle. Crater wear · Grade lacks wear resistance. · Change to a high efficiency grade. （BNC2010,BNX25,BNX20） · Cutting speed is too fast. · Reduce cutting speed and increase feed rate (low-speed, high-feed cutting). Breakage At Bottom of Crater Reduce the cutting speed to less than vc=200m/min. (Higher feed rate reduces the overall tool-to-work contact time.) Flaking · Grade lacks toughness. · Select a tougher grade (e.g. BNC2020 and BN2000). · Back force is too high. · Select an insert with a stronger cutting edge (Increase negative land angle and edge honing) · If the grade has enough toughness, improve the cutting edge sharpness. Notch Wear · Change to a grade with a higher boundary wear resistance (e.g. BNC2010 and BN2000). · Increase the cutting speed (150m/min or more). · High boundary stress. · Change to "Variable Feed Rate" method, which alters the feed rate at every fixed number of outputs. · Increase negative land angle and edge honing. Chipping at Forward Notch Position · Change to a fine-grained grade with a higher fracture · Impact to front cutting edge is resistance (e.g. BNC300 and BN350). too large or there is constant · Increase feed rates occurrence. (Higher feed rates are recommended to reduce chipping.) · Select an insert with a stronger cutting edge (Increase negative land angle and edge honing) Chipping at Side Notch Position · Select a tougher grade.（BN350,BNC300） · Impact to side cutting edge is · Reduce feed rate. too large or there is constant Increase the side cutting angle occurrence. · Increase insert nose radius N · Select an insert with a stronger cutting edge (Increase negative land angle and edge honing) Technical Guidance / References Thermal Crack · Completely dry condition is recommended. · Thermal shock is too severe. · Select a grade with better thermal conductivity. · Decrease cutting speed, depth of cut, feed rate. N30