Computer-Aided Design, Manufacturing, and Engineering (CAD/CAM/CAE) systems use computers to assist with product design, manufacturing planning and control, and engineering analysis. CAD is used to create and modify designs. CAM plans manufacturing operations. CAE analyzes designs through simulation. These systems typically include hardware like graphic displays and input devices, as well as software for shape manipulation and analysis. Rapid prototyping then fabricates physical models from CAD data by building up layers.
Introduction, Conventional and Revised with CAD/CAM Product cycle, Application of computers to the design process, comparison of capabilities of designers and computers, Reasons for implementing CAD, Benefits of CAD, CAD workstation,
What is CAD?
Computer-aided design is defined as the use of computer systems to assist in the creation, modification, analysis, or optimization of a design. CAD software is used to increase the productivity of the designer, improve design quality, document communication, and create databases for manufacturing. CAD uses computers to help design something in 2D (curves and figures) or 3D (curves, surfaces, and solids).
Introduction, Conventional and Revised with CAD/CAM Product cycle, Application of computers to the design process, comparison of capabilities of designers and computers, Reasons for implementing CAD, Benefits of CAD, CAD workstation,
What is CAD?
Computer-aided design is defined as the use of computer systems to assist in the creation, modification, analysis, or optimization of a design. CAD software is used to increase the productivity of the designer, improve design quality, document communication, and create databases for manufacturing. CAD uses computers to help design something in 2D (curves and figures) or 3D (curves, surfaces, and solids).
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3. Computer-Aided Design (CAD)
Use of computer systems to assist
in the creation, modification,
analysis, and optimization of a
design
Typical tools:
Tolerance analysis
Mass property calculations
Finite-element modeling and
visualization
Defines the geometry of the design
4. Computer-Aided Manufacturing
(CAM)
Use of computer systems to
plan, manage, and control
manufacturing operations
Direct or indirect computer
interface with the plant’s
production resources
Numerical control of machine
tools
Programming of robots
5. Computer-Aided Engineering
(CAE)
Use of computer systems to
analyze CAD geometry
Allows designer to simulate
and study how the product
will behave, allowing for
optimization
Finite-element method
(FEM)
Divides model into
interconnected elements
Solves continuous field
problems
6. Computer-Aided Design Process
Two types of activities: synthesis and
analysis
Synthesis is largely qualitative and hard to
capture on computer
Analysis can be greatly enhanced with
computers
Once analysis is complete, design
evaluation- rapid prototyping
Software packages for design optimization
7. Components of CAD/CAM/CAE
Systems
Major component is hardware
and software allowing shape
manipulation
Hardware includes graphic
devices and their peripherals
for input and output
operations
Software includes packages
that manipulate or analyze
shapes according to user
interaction
9. Hardware Components
Graphic device is composed of a display
processing unit, a display device, and one or
more input devices
Input devices:
Mouse
Space ball
Data tablet with a puck or stylus
Keyboard
Output Devices:
Plotters
Color laser printers
11. Hardware Configuration #1
Requires a big initial
investment for
hardware and software
Slow system response
times
Maintenance of
mainframe is
expensive Updating operating
systems is difficult
13. Hardware Configuration #2
Widely used; trend
Engineering
toward distributed
workstations connected
computing
in a networked
environment
Initial investment is
User can choose smaller than
appropriate configuration #1
workstation on a task
by task basis
14. Hardware Configuration #3
Popular with Same as the second,
small companies except engineering
workstations are replaced
by personal computers
running Microsoft Windows
Popular with companies
whose main purpose is Distinction between
to generate drawings configurations 2 and 3
with their becoming blurred as
CAD/CAM/CAE systems personal computers
evolve
15. Software Components
CAD software allows the designer to
create and manipulate a shape
interactively and store it
CAM software plans, manages and
controls the operations of a manufacturing
site
CAE software analyzes design geometry,
allowing designer to study product
behavior
16. Windows-Based CAD Systems
User interface is similar to Windows
Employs component technology, in which
best key software elements are selected
from among available software
Use object-oriented technology, which
modularizes the program
Capable of either parametric or variational
modeling
Internet support
17. Rapid Prototyping
Layer by layer fabrication of
three-dimensional physical
models from CAD
Fast and inexpensive
alternative for producing
prototypes and functional
models
Rapid Prototyping has surgical applications
Build parts in thin layers
Minimum operation time;
typically runs unattended
20. Rapid Prototyping Cycle
.STL is standard file format
for all U.S. rapid
prototyping systems
Preprocessing prepares
.STL file for various rapid
prototyping systems
Build process can last
from a few hours to
several days
Post processing: removal
of part from machine,
support removal, sanding
21. Rapid Prototyping Process (Damvig
)
“A computer-controlled laser beam
is scanned across the surface of a
vat of liquid photopolymer,
instantly solidifying the liquid at
each point of contact. Using data
generated from a CAD file,
individual cross-sections of the
three-dimensional geometry are
solidified in turn to build up a solid
part layer by layer. In this way
even highly complex geometries
can be built in a few hours without
requiring any tools. “
Editor's Notes
Original author: Paul King Presentation modified by: Karen Schuyler