Chapter20ba - _ Materials & Processes in Manufacturing...

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©2003 Bil Young 1 ME 151 Chapter 20 Fabrication of Plastics, Ceramics and Composites ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 2 Introduction Introduction Plastics, Ceramics, and Composites as compared to metals Products are used closer to their design limits Conversion of raw material to final part in a single operation Large complex shapes in a single part eliminating multi-part assembly Color, finish, and precision can often be obtained within the material and/or process Final part properties are typically a combination of material and process Chapter covers the basic processes for: Plastics Fabrication Processing Rubber and Elastomers Ceramics Processing Composite Materials Fabrication ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 3 Fabrication of Plastics Fabrication of Plastics Plastics are natural or synthetic resins, or their compounds, that can be molded, extruded, cast or used as thin films or coatings Specific method used for fabrication depends on the nature of the polymer ____________ - Polymers that can be reheated and hardened repeatedly without a chemical change to the material Heat >> Form to Shape >> Cool to Retain Shape ___________ - Polymers that undergo a permanent structure change and are not reformable (Irreversible chemical change) Heat >> Form to Shape ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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©2003 Bil Young 4 Fabrication Processes Fabrication Processes Common processes used to shape plastics: •C a s t i n g Blow Molding (Figure 20-2 Page 456) Compression Molding (Figure 20-3 Page 456)
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This note was uploaded on 04/19/2008 for the course ME 151 taught by Professor Alant.male during the Spring '08 term at Kentucky.

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Chapter20ba - _ Materials & Processes in Manufacturing...

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