Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1 Definition of "Manufacturing" • "Manufacturing" is a process for converting ideas and market or customer needs into artifacts; Includes design, procurement, test, finance, human resources, marketing, etc. • manufacturing is the conversion of raw materials into useful products – Main Focus of This Course
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
Definition of "Manufacturing"• "Manufacturing" is a process for converting ideas
and market or customer needs into artifacts;
Includes design, procurement, test,finance, human resources, marketing,etc.
• manufacturing is the conversion of rawmaterials into useful products
– Main Focus of This Course
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
Little "m" manufacturing is all about
• Creating shapes b various means and assemblingthese shapes into a useful product
• !he processes used to transform raw material intofinished products
• phsical product alwas has a shape – Function – Aesthetics
• !hese shapes are created b a wide variet of
processes• #tudents must remember that these processes e$istonl in the conte$t of the larger Manufacturingprocess
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
Manufacturing
C u s t om er
n e e d
s
People, money, machines and automation
Societal pressures, o!ernment regulations,
company plans and policies, etc
manufacturing
a#
material
%roducts
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
Commercially A!ailable
Materials
#$%&' "*Material Available as
$luminum
Copper and brass
Magnesium
Steels and stainless steels
Precious metals+inc
Plastics
'lastomers
Ceramics (alumina)
lass
raphite
P, -, %, #, ., S, /
P, f, %, #, ., s, /
P, %, #, w, S, /
P, %, #, ., S, /
P, -, %, t, ., /P, -, 0, ., /
P, f, %, #, w
P, b, #
p, %, #, s
P, %, #, ., s
P, %, #, ., s Note: P, plate or sheet1 -, foil1 %, bar1 #, tubing1 ., wire1 S,
structural shapes1 /, ingots for casting" &owercase letter
indicates limited a2ailability" Most of these materials are also
a2ailable in powder form"
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
Manufacturing Process
Capabilities-igure "3Manufacturing
process capabilitiesfor minimum partdimensions" Source:4" $" Schey,
Introduction to Manufacturing Processes (5d ed")"
Mcraw67ill, *89"
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
Dimensional Tolerance
-igure " 0imensional tolerance capabilities of 2arious manufacturing processes"
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
Dimensional Tolerance and
Surface Finish-igure "; <elationship between relati2emanufacturing cost and dimensional tolerance"
-igure "= <elati2e production time, as a function of surfacefinish produced by 2arious manufacturing processes" Source:$merican Machinist" See also -ig" 5;"33"
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
$-amples of eneral
Function.Process elationships
• Cast metals tend to be brittle• orging adds strength along flow lines• Machining is cost effective for small lot si0es
• Casting, forging and e$trusion have highsetup costs but low production costs
• +eat treatments affect hardness, strength,corrosion resistance and fatigue properties
• Machining results in lots of scrap *the bu tofl ratio
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Manufacturing Engineering and Technology Assiut Univ.-Mech. Eng. dept Lecture-1
/uy to Fly atio
!he weight of the purchased raw materialdivided b the weight of the final part