TAILIEUCHUNG - Cutting Tools P2

The process of metal removal, a process in which a wedge-shaped tool engages a workpiece to remove a layer of material in the form of a chip, goes back many years. Even with all of the sophisticated equipment and techniques used in today’s modern industry, the basic mechanics | Cutting Tool Applications Upcoming Chapters Metal Removal Cutting-Tool Materials Metal Removal Methods Machinability of Metals Single Point Machining Turning Tools and Operations Turning Methods and Machines Grooving and Threading Shaping and Planing Hole Making Processes Drills and Drilling Operations Drilling Methods and Machines Boring Operations and Machines Reaming and Tapping Multi Point Machining Milling Cutters and Operations Milling Methods and Machines Broaches and Broaching Saws and Sawing Abrasive Processes Grinding Wheels and Operations Grinding Methods and Machines Lapping and Honing George Schneider Jr. CMfgE Professor Emeritus Engineering Technology Lawrence Technological University Former Chairman Detroit Chapter ONE Society of Manufacturing Engineers Former President International Excutive Board Society of Carbide Tool Engineers Lawrence Tech. Univ. http Prentice Hall http Chapter 2 metal Removal Methods Inroduction The process of metal removal a process in which a wedge-shaped tool engages a workpiece to remove a layer of material in the form of a chip goes back many years. Even with all of the sophisticated equipment and techniques used in today s modern industry the basic mechanics of forming a chip remain the same. As the cutting tool engages the workpiece the material directly ahead of the tool is sheared and deformed under tremendous pressure. The deformed material then seeks to relieve its stressed condition by fracturing and flowing into the space above the tool in the form of a chip. A turning tool holder generating a chip is shown in Figure . Cutting Tool Forces The deformation of a work material means that enough force has been exerted by the tool to permanently reshape or fracture the work material. If a material is reshaped it is said to have exceeded its plastic limit. A chip is a combination of reshaping and fracturing. The deformed chip is separated from the parent material by fracture. The .

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