page 67
1 |
Polyethylene Terephthalate |
|
|
2 |
High Density Polyethylene |
|
|
3 |
Poly vinyl Chloride |
|
|
4 |
Low Density Polyethylene |
|
|
5 |
Polypropylene |
|
|
6 |
Polystyrene |
|
• Metals that are commonly recycled are,
iron/steel - this can be sorted using electromagnets aluminum -
platinum - reclaimed from catalytic converters
•Glass is typically sorted, and is easy to melt and reuse.
•Paper can be reused, but it must be mixed with new fiber.
DI:13.5 REFERENCES
Boothroyd., G., “Design for Assembly”, Department of Mechanical Engineering, University of Massachusetts, USA, 1979.
Boothroyd, G., and Knight, W., “Design for Assembly”, Spectrum, IEEE, September 1993, pp. 53-55.
Dodd., C.W., “Design for ‘X’”, IEEE Potentials, October 1992, pp. 44-46.
Iredale, R., “Automatic Assembly - Components and Products”, Metalwork Production, April 8,
1964.
Ullman, D.G., The Mechanical Design Process, McGraw-Hill, 1997.
page 68
DI:13.6 SAMPLE QUESTIONS
1.The theoretical minimum number of parts in a 3 prong electrical plug are,
a)1-2
b)3-5
c)6-8
d)other _____________________ (specify, and justify your answer below) (ans. b. 3 conductors and an insulator)
2.What features of a typical car windshield violate the principles of design for assembly (DFA)? (ans. length to width, fragile)
3.Sketch out components of a calculator that would observe the rules of Design For Assembly
4.Redesign the part below for more efficient assembly
************ Boothroyd piston figure