Lecture13b-Grinding and Other..not gonna be on test!!!!!

Lecture13b-Grinding and Other..not gonna be on test!!!!! -...

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Material Removal Processes Material Removal Processes Material Removal Processes – Abrasive, Chemical, and Electrical Lecture 13.b ISE 2204 – Introduction to Manufacturing Processes Dr. Jaime Camelio November 20 th , 2008 Grinding Operations Chemical-Mechanical Polishing Ultrasonic Machining Electrical Discharge Machining Laser Cutting Water-jet Machining ISE 2204 – Introduction to Manufacturing Processes – Fall 2008 Topics to be discussed
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Schematic illustration of a physical model of a grinding wheel, showing its structure and grain wear and fracture patterns. ISE 2204 – Introduction to Manufacturing Processes – Fall 2008 Grinding Wheel Knoop hardness range for various materials and abrasives. ISE 2204 – Introduction to Manufacturing Processes – Fall 2008 Grinding Wheel Types Some common types of grinding wheels made with conventional abrasives (aluminum oxide and silicon carbide). Note that each wheel has a specific grinding face; grinding on other surfaces is improper and unsafe.
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Examples of superabrasive wheel configurations. The rim consists of ISE 2204 – Introduction to Manufacturing Processes – Fall 2008 Superabrasive Wheels superabrasives and the wheel itself (core) i sg en e r ally mad eof metal or composites. The bonding materials for the superabrasives are: (a), (d), and (e) resinoid, metal, or vitrified; (b) metal; (c) vitrified; and (f) resinoid. Standard marking system for aluminum-oxide and silicon-carbide bonded abrasives. ISE 2204 – Introduction to Manufacturing Processes – Fall 2008 Grinding Wheel Marking System
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Standard marking system for diamond and cubic-boron-nitride bonded abrasives. ISE 2204 – Introduction to Manufacturing Processes – Fall 2008 Diamond and cBN Marking System Individual grains have irregular geometries The gains are randomly distributed and oriented in the periphery of the wheel The average rake angle is highly negative Cutting speeds of grinding wheels are very high typically on the order of 30 m/s or 6000 ft/min ISE 2204 – Introduction to Manufacturing Processes – Fall 2008 Mechanics of Grinding
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The grinding surface of an abrasive wheel (A46-J8V), showing grains, porosity, wear flats on grains (see also Fig 9 7b) and metal chips from the (a) Grinding chip being produced by a single abrasive grain. Note the large negative rake angle of the grain. (b) Schematic illustration of chip formation by an abrasive grain Note the negative rake angle the smal ISE 2204 – Introduction to Manufacturing Processes – Fall 2008 Abrasive Grains Fig. 9.7b), and metal chips from the workpiece adhering to the grains. Note the random distribution and shape of the abrasive grains.
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Lecture13b-Grinding and Other..not gonna be on test!!!!! -...

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