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Manufacturing Engineering Technology in SI Units, 6Manufacturing Engineering Technology in SI Units, 6thth Edition EditionChapter 26: Chapter 26: Abrasive Machining and Finishing Operations Abrasive Machining and Finishing Operations Copyright ? 2010 Pearson Education South Asia Pte LtdChapter Outline?Introduction?Abrasives and Bonded Abrasives?The Grinding Process?Grinding Operations and Machines?Design Considerations for Grinding?Ultrasonic Machining?Finishing Operations?Deburring Operations?Economics of Abrasive Machining and Finishing Operations Copyright ? 2010 Pearson Education South Asia Pte LtdIntroduction?Some manufacturing processes cannot produce the required dimensional accuracy or surface finish?An abrasive is a small, hard particle having sharp edges and an irregular shape?Abrasives is removing of small amounts of material from a surface through a cutting process that produces tiny chips?Grinding wheels can sharpen knives and tools?Sandpaper or emery cloth can smoothen surfaces and remove sharp corners Copyright ? 2010 Pearson Education South Asia Pte LtdIntroduction?Abrasives are hard and used in finishing processes for heat-treated metals and alloys?Applications include: of ceramics and off lengths of bars, structural shapes, masonry and unwanted weld beads and surfaces with jets of air or water containing abrasive particles. Copyright ? 2010 Pearson Education South Asia Pte LtdIntroduction Copyright ? 2010 Pearson Education South Asia Pte LtdAbrasives and Bonded Abrasives?Abrasives that monly used: ?Above abrasives are harder than conventional cutting-tool materials?Cubic boron nitride and diamond are the two hardest materials known; referred to as superabrasives?Friability defined as the ability of abrasive grains to fracture into smaller pieces Copyright ? 2010 Pearson Education South Asia Pte LtdAbrasives and Bonded AbrasivesAbrasi