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CUTTING TOOL TECHNOLOGY - Michigan State University

1 CUTTING tool TECHNOLOGY1. tool life2. tool Materials3. tool Geometry4. CUTTING fluids2 Introduction Machining is accomplished by CUTTING tools. CUTTING tools undergo high force and temperature and temperature gradient. tool life Two aspects of design tool Materials tool Geometry CUTTING fluids31. tool life Three modes of failure Premature Failure Fracture failure - CUTTING force becomes excessive and/or dynamic, leading to brittle fracture Thermal failure - CUTTING temperature is too high for the tool material Gradual Wear Gradual failure tool wear: Gradual failure Flank wear -flank (side of tool ) Crater wear -top rake face Notch wear Nose radius wear4 Crater and Flank WearISO Standard 3685-1977 (E) 5 Possible Wear Mechanisms Abrasion Flank and Crater wear Hard Inclusions abrading CUTTING tools Hot Hardness Ratio Erosion Attrition Adhesion Compatibility chart Diffusion/Dissolution Crater wear Chemical solubility Diamond dissolves into iron.

= tool life; and . n. and . C. depend on feed, depth of cut, work material and, tooling material • n. is the slope of the plot • C. is the intercept on the speed axis. n = vT C. n m p = vT f d C. Tool material. n. C (m/min) C (ft/min) High speed steel: Non-steel work 0.125 120 350. Steel work 0.125 70 200. Cemented carbide. Non-steel work 0 ...

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