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Machining Processes

Machining ProcessesIME 240 Material Removal Processes Machining is the broad term used to describe removal of material from a workpiece Includes Cutting, Abrasive Processes (grinding), Advanced Machining Processes (electrical, chemical, thermal, hydrodynamic, lasers) Automation began when lathes were introduced in 1700s Now have computer numerical control (CNC) machines Machining operations are a systemconsisting of: Workpiece material, properties, design, temperature Cutting tool shape, material, coatings, condition Machine tool design, stiffness & damping, structure Fixture workpiece holding devices Cutting parameters speed, feed, depth of cutIndependent variablesRange of Material Removal ProcessesEnergy sourceTransfer mediumProcessEnergy sourceTransfer mediumProcessMechanicalRigidChemicalLiqu idGranularElectricalandChemicalLiquidLiq uid/G

N = Rotational speed of the workpiece, rpm f = Feed, mm/rev or in/rev v = Feed rate, or linear speed of the tool along workpiece length, mm/min or in/min = fN V = Surface speed of workpiece, m/min or ft/min = D o N (for maximum speed) = D avg N (for average speed) l …

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