Tech 149: Unit 3
Computer-Aided Engineering and Other
CIM Subsystems
Computer-Aided Engineering
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INS
CAD
Process planning tasks
CNC programming tasks
Tool/fixture design
Time standards tasks
Plant layout & design
Analysis for manufacturability and
assembly
• Manufacturing cost estimation
ROB
CUS
BOM
MAR
CAP
P
MRP
CIM
DATABASE
AGV
CAE
EST
CNC
DOC
PUR
ANA
CAM
Sales and Marketing Sub-Systems
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Customer support and identification
Data collection and analysis
Forecasting tasks
Master production schedule (MPS)
Promotional and advertising tasks
Purchasing
Shipping and receiving
INS
CAD
ROB
CUS
BOM
MAR
CAP
P
MRP
CIM
DATABASE
AGV
CAE
EST
CNC
DOC
PUR
ANA
CAM
Material Handling Systems (MHS)
INS
CAD
ROB
CUS
BOM
MAR
CAP
P
MRP
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CIM
Conveyor systems
Robotics systems
Automated guided vehicle (AGV)
Automated storage and retrieval system
(ASRS)
Automated shuttle and pallet systems
DATABASE
AGV
CAE
EST
CNC
DOC
PUR
ANA
CAM
Inspection and Measurement Systems
INS
CAD
ROB
CUS
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CMM inspection system
Automatic scanners
Computerized gages
Others (electronic calipers etc.)
BOM
MAR
CAP
P
MRP
CIM
DATABASE
AGV
CAE
EST
CNC
DOC
PUR
ANA
CAM
Material Processing Systems
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Welding robots
Painting robots
CNC milling machines
CNC turning machines
Automated shearing machines
Automated punching machines
Programmable logic controllers
Others
INS
CAD
ROB
CUS
BOM
MAR
CAP
P
MRP
CIM
DATABASE
AGV
CAE
EST
CNC
DOC
PUR
ANA
CAM
Chapter 5: Design Automation:
Computer-Aided Engineering
• Computer-aided engineering (CAE) is the
analysis of the engineering design using
computer-based techniques to calculate product
operational, functional, and manufacturing
parameters too complex for classical methods.
• CAE also provides productivity tools to aid
production engineering area by providing
software to support group technology (GT),
computer-aided process planning (CAPP), and
computer-aided manufacturing (CAM).
Design for Manufacture and
Assembly (DFMA)
• DFMA is any procedure or design process
that considers the production factors from the
beginning of the product design.
• Originated from producibility engineering:
design for manufacture = DFM; design for
assembly = DFA.
Computer-aided Engineering
Analysis
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Finite-element analysis is most
frequently used
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Mass property analysis
(Weight, volume, center of mass
and moments of inertia of objects)
Computer-aided Engineering
Evaluation
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Prototyping
Rapid prototyping techniques:
1) Stereolithography
2) Solid ground curing
3) Selective laser sintering
4) Three-dimensional printing
5) Fused-deposition modeling
6) Laminated object manufacturing
Group Technology (GT)
GT is a manufacturing philosophy that
justifies small and medium-sized batch
production by capitalizing on design
and/or manufacturing similarities among
component parts.
Group Technology
Prismatic and round parts
Parts with holes
D
D
D
B
B
B
D
D
D
B
B
B
T
T
T
M
M
M
T
T
T
M
M
M
Group Technology (GT)
Coding and classification:
1)Coding is a systematic process of establishing an
alphanumeric value for parts based on selected part
features.
2)Classification is the grouping of parts based on
code values.
3)Coding and classification in GT are highly
interactive because the coding system must be
designed to produce classified groups with the
correct combination of common features.
Group Technology (GT)
In GT production cells, groups of
different machines are identified based
on their ability to produce families of
parts.
Group Technology (GT)
Reasons for adopting GT
• Benefits of GT
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Benefits in product design
Standardization of tooling and setup
More efficient material handling
Increased economies of batch-type production
Easier scheduling
Reduced work-in-process and lead time
Faster and more rational process planning
Computer-aided Process
Planning (CAPP)
• Consistent and correct process planning
requires both knowledge of the manufacturing
processes and experience.
• Two automation techniques are called variant
and generative process planning.
Computer-aided Process
Planning (CAPP)
 The CAPP variant approach uses a library of
manually prepared process plans in the
database and a retrieval system to match
components on new parts to existing process
pans of similar components.
 The CAPP generative approach utilizes a
process information knowledge base that
includes the decision logic used by expert
human planners.
Computer-aided Manufacturing
(CAM)
 CAM is the effective use of computer technology in
the planning, management, and control of
production for the enterprise.
 One of the major applications of CAM is in
CAD/CAM where the part geometry created with
CAD in the design engineering is used with CAM
software to create machine code (NC/CNC) capable
of machining the part.
 Production and process modeling.
 Production and process simulation.
 Production cost analysis.
Design and Production
Engineering Network Demands
 A common database for enterprise information
flow
 Easy, accurate and instantaneous movement of
part geometry files and product data between
departments
 An enterprise network is a communications
system that supports communications and the
exchange of information and data among various
devices connected to the network over distances
from several feet to thousands of miles
Automated Process Control Systems
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Temperature control
Pressure control
Time control
Weight control
Hardness control
INS
CAD
ROB
CUS
BOM
MAR
CAP
P
MRP
CIM
DATABASE
AGV
CAE
EST
CNC
DOC
PUR
ANA
CAM