05Lecture-p2-Ch21-22 - Manufacturing and Production...

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Manufacturing and Production Processes ENGR 3190U – Lecture 05 – Part 2 Chapter 21 - Theory of metal machining Sections 21.1, 21.5 Chapter 22 - Machining operations & Machine tools Sections 22.1, 22.1.2, 22.1.3, 22.2.2, 22.3, 22.3.1, 22.3.3, 22.4 1. Overview of Machining Technology 2. Turning and Related Operations 3. Drilling and Related Operations 4. Milling 5. Machining Centers and Turning Centers 6. Cutting Temperature
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Material Removal Processes A family of shaping operations, common feature is removal of material from a starting workpart so remaining part has the desired geometry Machining – material removal by a sharp cutting tool, e.g., turning, milling, drilling Abrasive processes – material removal by hard, abrasive particles, e.g., grinding Nontraditional processes - various energy forms other than sharp cutting tool to remove material
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Cutting action involves shear deformation of work material to form a chip. As chip is removed, new surface is exposed Figure 21.2 (a) A cross‑sectional view of the machining process, (b) tool with negative rake angle; compare with positive rake angle in (a). Machining
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Why Machining is Important Variety of work materials can be machined Most frequently used to cut metals Variety of part shapes and special geometric features possible, such as: Screw threads Accurate round holes Very straight edges and surfaces Good dimensional accuracy and surface finish
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Disadvantages with Machining Wasteful of material Chips generated in machining are wasted material, at least in the unit operation Time consuming A machining operation generally takes more time to shape a given part than alternative shaping processes, such as casting, powder metallurgy, or forming
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Machining in Manufacturing Sequence Generally performed after other manufacturing processes, such as casting, forging, and bar drawing Other processes create the general shape of the starting workpart Machining provides the final shape, dimensions, finish, and special geometric details that other processes cannot create Most important machining operations: Turning, Drilling, Milling
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Cutting Conditions in Machining Three dimensions of a machining process: Cutting speed v – primary motion (ft/min) Feed f
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  • Spring '10
  • yang
  • Milling machine, Milling cutter, Related Operations Drilling and Related Operations Milling Machining Centers

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