topic 4 – manufacturing processes and techniques fall 2006
TRANSCRIPT
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Topic 4 – Manufacturing Processes and Techniques
Fall 2006
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4.1 Manufacturing Processes and Techniques
• Manufacturing Process• Manufacturing Technique• Shaping
– Bending - http://manufacturing.stanford.edu/hetm.html (Forming Shaping)
– Molding - – Casting - http://manufacturing.stanford.edu/hetm.html (casting Metal)– Weaving
• Joining– Fasteners – screws, nail, rivets, welds, etc. http://
manufacturing.stanford.edu/hetm.html (welding)– Adhesives– Fusing– Stitching
• Wasting - http://manufacturing.stanford.edu/hetm.html (machining)– Machining– Cutting– Abrading
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4.2 Selecting Materials and Techniques
• The selection of materials takes into account economic processing and service requirements.
• Successful products should be evaluated in term of efficiency and economy of manufacture as well as performance
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Techniques
• Injection Molding - • Lamination• Sintering• Extrusion• Cutting and Machining
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Injection MoldingThe direct introduction of molten plastic under pressure into a die which
then cools rapidly allowing the formed object to be released from the mold
• Advantages– No finishing required, volume production, use
of different molds• Disadvantages
– Set up costs reduce suitability for low volume production, limitations to the size, shape
• Design Considerations – must consider thermal expansivity and toughness
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Laminationbuilding up a thick layer of material using thin layers of the material
joined with adhesives includes mold or former and a method of cramping
Advantages – no finishing required, able to form complex shapes and surfaces, can suit large surfaces, able to combine different materials
Disadvantages – labor intensive, may require production of a mold, limitations to the glue, size, clamping, shape and angles of curvature.
Design Considerations – Good when needing a tough and high tensile strength.
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SinteringThe fusing of solid particles together by heat and pressure without
completely liquifying the particles
AdvantagesDisadvantagesDesign Considerations
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ExtrusionForcing material through a shaped die to produce a shaped rod or tube
of material, eg: wire, pasta, toothpaste
Advantages
Disadvantages
Design Considerations
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Cutting and MachiningCutting a material into shape and finishing it by machines
Advantages
Disadvantages
Design Considerations