TAILIEUCHUNG - Cutting Tools P8

Drilling is the process most commonly associated with producing machined holes. Although many other processes contribute to the production of holes, including boring, reaming, broaching, and internal grinding, drilling accounts for the majority of holes produced in the machine shop. This is because drilling is a simple, quick, and economical method of hole | 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 Finishing Processes Grinding Wheels and Operations Grinding Methods and Machines Lapping and Honing Chapter 8 Drills Drilling Operations 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 . http Prentice Hall http Introduction Drilling is the process most commonly associated with producing machined holes. Although many other processes contribute to the production of holes including boring reaming broaching and internal grinding drilling accounts for the majority of holes produced in the machine shop. This is because drilling is a simple quick and economical method of hole production. The other methods are used principally for more accurate smoother larger holes. They are often used after a drill has already made the pilot hole. Drilling is one of the most complex machining processes. The chief characteristic that distinguishes it from other machining operations is the combined cutting and extrusion of metal at the chisel edge in the center of the drill. The high thrust force caused by the feeding motion first extrudes metal under the chisel edge. Then it tends to shear under the action of a negative rake angle tool. Drilling of a single hole is shown in Figure and high production drilling of a plate component is shown in Figure . FIGURE .

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