Tool wear and damage Causes and countermeasures Flank Wear Tool grade is too soft Cutting speed is too high Flank angle is too small Feed rate is e

Tool wear and damage Causes and countermeasures Flank Wear Tool grade is too soft Cutting speed is too high Flank angle is too small Feed rate is e

Tool wear and damage Causes and countermeasures Flank Wear Tool grade is too soft. Cutting speed is too high. Flank angle is too small. Feed rate is extremely low. Tool grade with high wear resistance. Lower cutting speed. Increase flank angle. Increase feed rate. Crater Wear Tool grade is too soft. Cutting speed is too high. Feed rate is too high. Tool grade with high wear resistance. Lower cutting speed. Lower feed rate. Chipping yWmum Tool grade is too hard. Feed rate is too high. Lack of cutting edge strength. Lack of shank or holder rigidity. Tool grade with high toughness. Lower feed rate. Increase honing. (Round honing is to be changed to chamfer honing.) Use large shank size. Fracture Tool grade is too hard. Feed rate is too high. Lack of cutting edge strength. Lack of shank or holder rigidity. Tool grade with high toughness. Lower feed rate. Increase honing. (Round honing is to be changed to chamfer honing.) Use large shank size. Plastic Deformation WEBBBSBBA Tool grade is too soft. Cutting speed is too high. Depth of cut and feed rate are too large. Cutting temperature is high. Tool grade with high wear resistance. Lower cutting speed. Decrease depth of cut and feed rate. Tool grade with high thermal conductivity. Welding Cutting speed is low. Poor sharpness. Unsuitable grade. Increase cutting speed. (For JIS S45C cutting speed 80m/min.) Increase rake angle. Tool grade with low affinity. (Coated grade cermet grade) Thermal Cracks mf- - ;'- t r-j tr-'-.t -'Z -jp Expansion or shrinkage due to cutting heat. Tool grade is too hard. Especially in milling. Dry cutting. (For wet cutting flood workpiece with cutting fluid) Tool grade with high toughness. Notching j .AA+k . A... yam f C y Hard surfaces such as uncut surfaces chilled parts and machining hardened layer. Friction caused by jagged shape chips. (Caused by small vibration) Tool grade with high wear resistance. Increase rake angle to improve sharpness. Flaking Cutting edge welding and adhesion. Poor chip disposal. Increase rake angle to improve sharpness. Enlarge chip pocket. Flank Wear Fracture Damage for polycrystallines 3 tSKr' Damage due to the lack of strength of a curved cutting edge. Increase honing. Tool grade with high toughness. Crater Wear Fracture Damage for polycrystallines e q(fcv'- Tool grade is too soft. Cutting resistance is too high and causes high cutting heat. Decrease honing. Tool grade with high wear resistance. Q044 TECHNICAL DATA TECHNICAL DATA TOOL WEAR AND DAMAGE CAUSES AND COUNTERMEASURES Tool Damage Form Cause Countermeasure