582 Каталог SUMITOMO 2015 Режущий инструмент и инструментальная оснастка Стр.578

Каталог SUMITOMO 2015 Инструмент и оснастка Стр. 578 0582 ENG Lab2u

Technical Guidance Tool Tool Failures & Remedies Failures & Remedies 578 1. Forms of Tool Failure No. Failure Cause 1-5 Flank Wear Due to the abrasive effect of hard grains contained in the work material 6 Chipping Physical Fine chips caused by high-pressure cutting, chatter, vibration, etc. 7 Partial Fracture Due to the mechanical impact when an excessive force is applied to the cutting edge 8 Crater Wear Carbide particles are removed due to degradation of tool performances and chemical reactions at high temperature 9 Deformation Chemical The cutting edge is deformed due to its softening at high temperature 11 Thermal Crack Thermal fatigue in the heating and cooling cycle with interrupted cutting 11 Build-Up Edge A portion of the workpiece material adheres to the insert cutting edge 2. Failure Remedies Failure Basic Remedy Proven Remedies Excessive Flank Wear Tool Material Cutting Conditions > Use a more wear-resistant grade Carbide - fCoated Recommended Insert Grade I Cermet Decrease speed Finishing Rough steel AC810P ACA20P Cast iron BN700, BN7000, BNC500 AC405K Excessive Crater Wear Tool Material Tool Design Cutting Conditions Use a crater-resistant grade Coated Carbide- > Recommended Insert Grade I Cermet Enlarge the rake angle Select the correct chip breaker Decrease speed Reduce the depth of cut and feed Steel Cast Iron Finishing AC810P BN700, BN7000, BNC500 Rough ACA20P AC830P AC415K, AC420K Cutting Edge Chipping Tool Material Tool Design Cutting Conditions Use tougher grades > Recommended Insert Grades If carbide, (AC820P AC830P) If built-up edge occurs, change to a less susceptible grade (cermet) Reinforcement of the cutting edge (honing) Reduce the rake angle Increase speed (if caused by edge build-up) Steel Cast Iron Finishing T2000Z,T1200A BN700, BN7000, BNC500 Rough ACA20P AC830P AC420K All coated inserts are honed Use tougher grades If carbide, (AC820P AC830P) Use holder with a large approach angle Use larger shank-size holder Reduce the depth of cut and feed Recommended Insert Grade Steel Cast Iron Rough Machining AC820P AC830P AC420K Change to a grade which is adhesion resistant Increase the cutting speed and feed Use cutting fluids Recommended Insert Grade Steel Cast Iron Finishing T2000Z, T1200A BN700, BN500 Rough AC820P AC700G, YB100 Change to high thermal resistant grades Reduce the cutting speed and feed Steel Cast Iron Finishing T2000Z,AC810P AC405K Rough ACA20P AC415K, AC420K Partial Fracture of Cutting Edges Tool Material Tool Design Cutting Conditions Built-up Edge Tool Material Cutting Conditions Plastic Deformation Tool Material Cutting Conditions