RELATIONSHIP MATRIX
9 - STRONG
3 - MEDIUM
1 - WEAK
CORRELATION MATRIX
o
x
Positive
Negative
x
o
o
OPERATION Easy to close
Stays open on a hill
Easy to open
Doesn't kick back
Doesn't leak in heavy rain
No road noise
No wind noise
Easy to clean
Won't rust
A
ASSEMBLY
What Is Its Purpose?
To join components, formless material, and
sub-assemblies into a Complex Product
Comp A
SubAssembly
PAINT
Comp B
Final
PRODUCT
Comp C
Assembly
WHY ASSEMBLE?
1) Movement between parts is required
2) Different material needed
3
ME557DesignForManufacturability
Fall2013
LECTUREOUTLINE
Week
D a te
Topic
Reading
Assignment
Homework
1
Au g1 9 1 3
Con cu rren tE n gin eerin g
.
.
.
Au g2 1 1 3
Design Process
Dieter(D)1 .1
1 .5
.
2
Au g2 6 1 3
Material
Con strain ts/Man u factu rin g
STATISTICS
How can we estimate population parameters from a
random sample?
Given a large enough set of
observations, we can look at the distribution of values.
Example
Frequency Distribution of Data
Cumulative Frequency Distribution
Measures of Centr
ME 557 Design for Manufacturability
Statistics Review Problems
Problem 1
The diameters of a batch of ball bearings are known to follow
normal distribution with a mean 4.0 in and a standard
deviation 0.1 in. If a ball bearing is chosen randomly, find the
p
PROBABILITY
Probability deals with the laws of chance which govern
the occurrence of random events.
Definitions:
P(A)
the probability that an event A will occur
P(A) = 0 A is an impossibility
P(A) = 1 A is a certainty
P(A) = number of ways in N that pro
DIMENSIONING ENGINEERING DRAWINGS
Engineering Drawings are used to convey shape
information.
Types of Drawings:
- Detail drawing: typically provides 3 views with
dimensions, and material and surface finish data.
- Assembly drawing: provides the relative
DESIGN FOR MANUFACTURABILITY
What: Integrating product design with
downstream production issues
Why:
Lower production cost
Higher quality
Quicker time to market
When: Product concept through product disposal
SHOULD BE DONE ROUTINELY!
Managers
Executed
QUALITY FUNCTION DEPLOYMENT
Translate the customer wishes into the design of a
product.
Utilizes the House of Quality.
Targets what needs to be designed first; versus how
the design will look and work.
Advantages of QFD:
- Preserves knowledge
- Fewer star
IMPORTANCE OF DESIGN IN DFM
By the time the design is finished less than 10% of
the product cost has been spent yet 80% of the cost
has been committed!
WHAT IS DESIGN?
DESIGN is the PROCESS by which PLANS are
prepared for PRODUCTS to satisfy the NEEDS of