Chapter12_Shpg+Rmgb - Chapter 12 Shaping Forming and...

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Chapter 12 Sh i F i d M t i l Shaping, Forming and Material Removal
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Manufacturing Definition: manufacturing, in its broadest sense, is the process of converting raw materials into product Design of the product Selection of the raw material The sequence of processes through which the product will be manufactured Typical manufacturing methods include – Casting – Forming (Powder Metallurgy and Forging) and Shaping – Machining – Joining – Finishing Inspection, assembly if required, and testing typically follow
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Recommended Reading Callister p. 565-569, 471-484 • AERO3700 course pack: p. 336-394, 312- AERO3700 course pack: p. 336 394, 312 335, 425- 454
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Shaping of Plastics Shaping of Ceramics Shaping Metals Material Removal
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Shaping Plastics • Thermoplastic - forming temperatures Thermoplastic - forming temperatures are relatively low and can be reformed Thermosets curing occurs during the Thermosets - curing occurs during the process, need higher temperatures and longer time Callister, p. 565-569
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Injection Molding for Thermoplastics Granular or powder material is fed into a heated cylinder or barrel. A reciprocating screw moves the material toward the A reciprocating screw moves the material toward the die, material softens at same time. Plasticized material (viscous liquid) accumulates at th di t the die entrance. Once accumulated, the correct amount of material is injected into the die. Injection pressure of 30 – 100 MPa minimizes cooling shrinkage and reduces porosities.
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Advantages and Disadvantages Advantages High quality, high production rate Relatively low labour cost Disadvantages High capital cost of machines Close process control is Good surface finish Highly automated Intricate parts can be made Close process control is needed
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