308806 Lecture Notes - Lecture 2: Bar Stock, Powder Metallurgy, Unit Operation
5 Nov 2013
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Document Summary
Machining: broad term used to describe removal of unwanted material from a workpiece in the form of chips. Cutting: material removal by a sharp cutting tool, eg. turning, milling and drilling. Abrasive process: material removed by hard, abrasive particles, eg. grinding, honing and lapping. Non-traditional process: various energy forms other than sharp cutting tool remove material, eg. electric discharge machining (edm), water-jet machining and laser beam machining. Various work materials can be machined, most commonly metals. A wide variety of part shapes and special geometric features are possible, eg. screw threads, accurate round holes, very straight edges and surfaces. Wasteful of material: chips generated in machining are wasted material, at least in the unit operation. Time consuming: generally takes more time to shape a given part than alternative shaping processes, eg. casting, powder metallurgy, forming. Generally performed after other manufacturing processes such as casting, forging and bar drawing.
