Download - Lecture 01 2009 Stu
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Politecnico di TorinoCorso di studio in Ingegneria dellAutoveicolo
Lecture_01_2009
Computer Aided Design
Lecture 01
Vittorio Romagnoli
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2 Lecture_01_2009Computer Aided Design
Manufacturing technologies drive CAD evolution
Machine tool product info drawing
Manufacturing technology
NC Machine tool
DNC Machine tool FMS
Robot
Automated storage
Conveying systems
Product info
on computer more complete
more accurate
Model
Geometrical
Graphical2D drawing
3D WF
Surfaces
Solids
Feature based
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3 Lecture_01_2009Computer Aided Design
Agile Manufacturing
lead time reduction
minimum stock
just in time
efficiency and flexibility
Agile manufacturing
Market
Social and economical changes
Manufacturing technologies
NC Machine tool
DNC Machine tool
FMS
Robot
Automated storage
Conveying systems
Design, Process planning, Manufacturing integration
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4 Lecture_01_2009Computer Aided Design
Machine tools
Part shape is linked to the feasibility of a manufacturingprocess (draft angle, fillet, etc.) and to the operatingcapacity of machine tools
Milling machine
Workpieces of any shape
axial-symmetrical machining
Lathe machine revolving parts
Millingmachine Lathemachine
Cutting
motionFeedingmotion
Tool
Part
Part
Tool
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5 Lecture_01_2009Computer Aided Design
Marketcompetition & opportunity
Marketcompetition & opportunity
Process dynamics
CompanyCompany
Current processCurrent process
New processNew process
Issue listIssue listCompanys
Objectives &Needs
CompanysObjectives &
Needs
Tools&
methodologies
Tools&methodologies
UserRequirements
UserRequirements
ITOpportunities
ITOpportunities
Problems Solutions
Product
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6 Lecture_01_2009Computer Aided Design
Design CAx environment
Virtual tools amplify people abilities in theorganization where they work to increase the qualityof both product and production process to bedeveloped
METHOD
Process
Product &Process
conception
Product &Process
development
Styling
Prototype building
Tooling Design
Tooling Manufacturing
Preserie Salitaprod.
Try-out
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7 Lecture_01_2009Computer Aided Design
Lean Product Development System
sustain the system
The Toyota Product Development SystemJeffrey K. Liker, James M. MorganProductivity Press, 2006
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8 Lecture_01_2009Computer Aided Design
Lean Product Development System
The Toyota Product Development SystemJeffrey K. Liker, James M. MorganProductivity Press, 2006
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9 Lecture_01_2009Computer Aided Design
Graphic system structure
Application
programGraphicSystem
Model
data
results image
.
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10 Lecture_01_2009Computer Aided Design
Overall process from idea to physical product
ProductSpecs
Part
Assembly
Study
Product
Definition
Single partProduction
Physicalpart
ProductAssembly
idea
Product requirements Constraints
Roughpart
Manuf. Eng.
Machining
Manuf. Eng.
Assembly
Machining & Quality
Cycles + OPs doc
Machinery & Tooling
CMM & Tooling
Assembly & Quality
Cycles + OPs doc
Machinery & Tooling
CMM & Tooling
.
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11 Lecture_01_2009Computer Aided Design
Company
Styling
Automotive Product Development Process
TTM
Project approval Commercial launch
ProductionProduct &Process
conception
Prototypes production andTesting
Pre-seriesProduct & Processdevelopment
Tools developmentfor parts & assembly
Tools building
production & assembly
Processtry-out
Customer support
Customers
Suppliers Product & Process engineering, tool
design
Tools
Parts for prototypes and production
Extended Enterprise
Conception Development Production
DECISION PROCESS T, , Q
Gate Milestone
Build stages
Prototypes , ,
Pre-series
.
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12 Lecture_01_2009Computer Aided Design
ManageManage
Process from IDEA to PHYSICAL SYSTEM
Idea Constraints
Virtual DesignEnvironment
Product&ProcessVirtual Model
Define
ValidateChange
Physical Model
Build
Test
Correlate
Physical&Virtual
PhysicalSystem
.
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13 Lecture_01_2009Computer Aided Design
Relations between different actions
PRINCIPAL ACTIONS
Define
Validate
Change
Build
UNDERSTAND
SHARE
ASSOCIATEDACTIONS
RETRIEVE
RELEASE
MANAGEMENTACTIONS
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14 Lecture_01_2009Computer Aided Design
Design process phases
time
Part - model
Study - conceive Assembly - check
Design process
Design means conceive the systemspecifications
Model each part in detail
Key decisions are taken in the study phase
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15 Lecture_01_2009Computer Aided Design
Relations between Study, Part, Assembly
PARTDetailerview
STUDY Designers view
ASSEMBLYManufacturing engineer view
Documentation
Model 1
Documentation
StudyModel
Documentation
AssemblyModel
carry overnew
Describes how the system works Allows to conceive with coherence Contains:
specifications
context (constraints, fastenings) relations among parts
Checks the assembly coherence Describes how to assembly Shows steps & alternatives
Describes the part and how to build it Contains:
context (constraints, fastenings) shape & tolerances
Model 2 Model 3 Model nModel 4
Parte 3
Parte 1
Punti di saldatura
Parte 2
Complessivo scocca
Parte 3
Parte 1
Punti di saldatura
Piano di fissaggio
Asse del fissaggio
Parte 2
Piano di accoppiamento
Studio
Particolare
a1 a2b1
b2
d
h sr1
r2 r3r4
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16 Lecture_01_2009Computer Aided Design
Product data & activities links
Part model + docs
Study model + docs
Assembly model + docs
Prototype
ME Machining
Prototype
ME Assembly
Costs & Quality
System virtual validation CAE Tolerance chain, etc.
Part virtual validation - CAE
Part Machining Process & cycles definition Machinery & Tooling definition
Part checking Process & cycles definition CMM & Tooling definition
Costs & Quality
Product virtual validation - DMU
Product Assembly Process & cycles definition Machinery & Tooling definition
Product checking Process & cycles definition CMM & Tooling definition
Costs & Quality
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17 Lecture_01_2009Computer Aided Design
Design problems
Study layout process
Design means define and document the productbehaviour by: solving a set of design problems related to system functionality making
hypothesis and validate them
managing and making coherent data initially: incomplete, partial,evolving and non-coherent
integrating and optimizing the overall solution
Crank Scheme
Cylinder Block
Scheme
Valves
Scheme
Crank-shaftScheme
Engine Layoutwith positioned
auxiliary
Valves - PistonInterference
Cylinder HeadScheme
Sinthesys &Optimisation
Conrodenvelope
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18 Lecture_01_2009Computer Aided Design
Modeling process
Modeling process - Detailed levelModeling process - High level
Part modeling process
Cyl BlockHigh level
parameters
DetailedParameters
Partspecs
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19 Lecture_01_2009Computer Aided Design
Modelingprocess
Modelingprocess
Modelingprocess
Detailed
level
Detailed
level
Detailed
level
Hig
hlevel
Hig
hlevel
Hig
hlevel
Problem 1
Problem 2
Problem 3
DESIGN - Study
Study layout & part modeling interaction
Part A - Cyl Head
High levelparameters
Detailedparameters
Problem 2
Problem 3
Problem 1
Problem n
Problem 1
Problem 2
Part B - Cyl Block
High levelparameters
Detailedparameters
Problem 1
Problem 3
Part C Cover-head
High levelparameters
Detailedparameters
Study Tabpar
Specs compliance check
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20 Lecture_01_2009Computer Aided Design
Stamping DieDesigner Assembly tooling
Designer
S
ProductDesigner
C2
C1
I
M
E
Process views
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22 Lecture_01_2009Computer Aided Design
Physical object, Model and Representation
Repr. 2
Repr. 1
Representation
Model B
Model A
Object
Shape
Technical drawing
Realistic imageOil pumpimage
Oil pumpCAD model
Pysical
oil pump
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23 Lecture_01_2009Computer Aided Design
X thumb
Y index finger
Z middle finger
Reference system of the model
We use a right-hand cartesian orthogogonal system
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24 Lecture_01_2009Computer Aided Design
Vehicle drawing reference system
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25 Lecture_01_2009Computer Aided Design
PDM
Product
Product parts
Part # 1
Part # 2
Part # 3
Part # k
Part # n
Object & Product
Variant 1
Variant 2
CHARACTERISTICS: geometrical
shape
physical weight
material cost reliability investiments targets ...
PYSICAL
OBJECT
VIRTUAL
OBJECT
Product = objects + structure
CADCAE
...
CAM & Rapid Prototyping
Reverse Engineering
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26 Lecture_01_2009Computer Aided Design
Object: digital vs virtual
Digital
Physical
Virtual
ObjectMan Computer
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27 Lecture_01_2009Computer Aided Design
Model & Representation
Pattern Recognition
Computer Graphics
Oil pumpimage
Oil pumpCAD model
ImageProcessing Modeling
Image Model
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28 Lecture_01_2009Computer Aided Design
ININ OUTOUT
IMAGEIMAGE
MODELMODEL
MODELMODELIMAGEIMAGE
Model & Representation - I/O Relations
IMAGE
PROCESSING
IMAGE
PROCESSING
COMPUTER
GRAPHICS
COMPUTER
GRAPHICS
PATTERN
RECOGNITION
PATTERN
RECOGNITION
MODELINGMODELING
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29 Lecture_01_2009Computer Aided Design
Computer Graphics
What
Computer Graphics generates synthetic images approximatinga model with discrete functions
the resolution within the image space
the colors simultaneously present within the color space
A synthetic image is a set of color dots on a graphic display
Why
People communicate well through images
1/3 of our brain activity is dedicated to the visual processing
are one of the most common communication tool with a computer
An image consists of a wide set of data and information in asynthetic and integrated form
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30 Lecture_01_2009Computer Aided Design
Computer Graphics use
Computer
Graphics
To do things NOT FEASIBLEwithout
Computer Graphics
To do things FEASIBLEwithout
Computer Graphics
* better* better
* quickly* quickly
* easier* easier
* lower cost* lower cost