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Chapter 3: Design Process n Role of CAD - Coggle Diagram
Chapter 3: Design Process n Role of CAD
3.1 Design process
Types of design
Original design
innovative design
rarely occur, but will give big impact to market if occur
eg. mircoprocessor
Adaptive design
adapt a design from a known solution to fulfill needs
eg. adapting ink-jet printing concept to spray binder to hold particles in place in RP machine
Redesign
improve an existing design
does not involve change in working principle
change in design parameter
Selection design
design uses standard components from vendor
implemented by selecting certain components base on need
Industrial design
improving the appeal of a product
more artistic than engineering
What is design?
innovative and highly iterative process
also decision-making process
process of identifying and deeply understanding a problem, thinking creatively, identify the best solution, use project management and teamwork skills to implement solution.
Morphology of design
a study of form or structure
a design projects goes through a number of time phases
Conceptual design
a feasibility study to ascertain there really exists a need
Define problem
Gather information
Concept generation
Evaluation of concepts
Embodiment design
concept generated in the feasibility study is developed
model building n testing
study the advantage n disadvantage of different solution
check performance, quality strength
Product architecture
Configuration design
Parametric design
Detail design
furnish the complete engineering description of the tested product
arrangement, form, dimension, tolerances are determined
material to be used and manufacturing process are decided
complete prototype is tested
Planning for manufacture
include production planning and control activities for manufacturing of product
Planning for distribution
marketing phase
Planning for use
incorporate design all necessary user-oriented features
Planning for retirement
for when the products reached the end of useful life
Design consideration
Design for assembly (DFA)
simplicity
standardize material usage
use widest possible tolerance
choose material that suit function
Outcome
shorten product design time
reduce assembly time
simplify assembly process
Other considerations
Product use
Design life
Human factor consideration
Design for manufacture (DFM)
to ease of manufacture of the collection of parts
Process selection
tolerance requirement
production volume
Reducing process stage
component minimization
elimination of finishing process
Design of the process
ensure design of component will satisfy production process
3.3 Computer applications
Computer application in design
visualizing and styling of products for concept generation
software - autocad,solidworks
hardware - 3d scanner
Computer application in analysis
for design analysis
CAE tools - FEA
eg, ANSYS
Computer application in Manufacturing
used for planning, monitoring, control manufacturing process
use CAM tools - CNC machine
software - MasterCAM
3.4 Digital Mock-up (DMU)
Roles
allow full visualization of product in 3D
permits collaborative engineering
improves error detection
Goals
reduce product development costs
reduce time-to-market
increase product quality