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DFMA Paradigms as DFMA Paradigms as Applied to the Applied to the
Swingline 747 StaplerSwingline 747 StaplerPresented by,Presented by,
Team AlphaTeam Alpha
Overview Overview
Introduction to DFMA.Introduction to DFMA. Stapler Properties/Specifications.Stapler Properties/Specifications. Material Selection.Material Selection. Manufacturing Processes.Manufacturing Processes. Assembly Analysis.Assembly Analysis. Conclusions.Conclusions. Questions.Questions.
INTRODUCTIONINTRODUCTION
Product SpecificationsProduct Specifications
DFMA as Applied For DFMA as Applied For Material SelectionMaterial Selection
MATERIAL SELECTIONMATERIAL SELECTION
Intuitive Method For Intuitive Method For Material SelectionMaterial Selection
First best material
Same Material For Same Part
Problem solving material selection
Searching material selection
The material is selected among the few materials
the design engineer is familiar with.
A property has given rise to problems. A new material
is chosen in the same group of material with a higher
value of the property.
The designer takes more or less randomly intoaccount one requirement at the time.
Drawbacks with Intuitive Methods
Important requirements have often given rise to failures in operation.
First solution at hand is taken which is not very likely to be good solution.
The solution is typically far from the optimum giving the part poor competitiveness.
Major Material Major Material Properties Which Properties Which Influence Material Influence Material
SelectionSelection Young's Modulus and Specific Young's Modulus and Specific
StiffnessStiffness StrengthStrength ToughnessToughness Density Density CostCost
Manufacturing Manufacturing ProcessProcess
Which Manufacturing Paradigms to Use
static
Large
Market size
Market Type Mass production
Marketniches
Several
Productimprovement
Yes No
ConcurrentEvolving product family
Concurrent Product family
Manufacturing Processes
The Upper ArmThe Upper ArmStep: 1Step: 1
The Upper ArmThe Upper ArmStep: 2Step: 2
The Upper ArmThe Upper ArmStep: 3Step: 3
The Upper Arm
Original Design Modified Design
Staple Slide
Original Design Modified Design
Upper Staple Guide
Original Design Modified Design
Comparision of Manufacturing Cost
0
5000
10000
15000
20000
25000
Upp
er A
rm
Upp
er S
tapl
eG
uide
Anv
il
Sta
ple
Slid
e
Co
st i
n $
Original Design
Modified Design
Assembly ProcessAssembly Process
Handling Times Data Table
CONCLUSIONSCONCLUSIONS
DFMA ParadigmsDFMA Paradigms Material SelectionMaterial Selection Manufacturing Manufacturing AssemblyAssembly Overall SummaryOverall Summary
QuestionsQuestions
