CATIA V5 Lectures.ppt

CATIA V5
Dr Ahmed Kovacevic
City University London
School of Engineering and Mathematical Sciences
Room CM124, Phone: 8780, E-Mail: Design@city.ac.uk
www.city-design.tk www.staff.city.ac.uk/~ra600/intro.htm

Course Schedule
• Lecture 1
• Introduction
• Software Overview
• Part Design and Sketching
• Lecture 2
• Product Structure and
Assembly Modelling
• More advance Part Design
• Lecture 3
• Wireframe and Surface
• Drafting
• Lecture 4
• Finite Element Analysis
• Data Exchange
• Parameters and Formulas

CATIA Overview
• CATIA v5 is an Integrated Computer Aided
Engineering tool:
 Incorporates CAD, CAM, CAE, and other applications
 Completely re-written since CATIA v4 and still under development
 CATIA v5 is a native Windows application
 User friendly icon based graphical user interface
 Based on Variational/ Parametric technology
 Encourages design flexibility and design reuse
 Supports Knowledge Based Design
Lecture 1

CATIA v5 Philosophy
• A Flexible Modelling environment
 Ability to easily modify models, and implement design changes
 Support for data sharing, and data reuse
• Knowledge enabled
 Capture of design constraints, and design intent as well as final
model geometry
 Management of non-geometric as well as geometric design
information
• The 3D Part is the Master Model
 Drawings, Assemblies and Analyses are associative to the 3D
parts. If the part design changes, the downstream models with
change too.
Lecture 1

CATIA v5 Applications
• Product Structure
• Part Design
• Assembly Design
• Sketcher
• Drafting (Interactive and
Generative)
• Wireframe and Surface
• Freestyle Shaper
• Digital Shape Editor
• Knowledgeware
• Photo Studio
• 4D Navigator (including
kinematics)
• Manufacturing
• Finite Element Analysis
Lecture 1

CATIA User Interface
Menu Bar
View Toolbar
Application
Tool Bar
File Toolbar
Current
Application
Online Help
Lecture 1

Interacting with CATIA (1)
• Selecting an Application
 Use the Start menu to select an
application
• Working with Files
 Use the File menu to create,
open, save and print
Lecture 1

Interacting with CATIA (2)
• Display Commands
 Fly Through
 Fit View
 Layer control
 Pan
 Rotate
 Zoom
 Normal View
 Standard Views
 View Types: Shaded/ Hidden
Line/ Wireframe/ User Defined
• Hide/ Show
 Hide
 Swap Visible Space
• Properties
 Display Characteristics for an
object are set by selecting the
entity, then pressing the right
mouse button and selecting
Properties from the menu
Lecture 1

Manipulating the Display using the Mouse
• Pan
 Press and hold the middle
mouse button and move the
mouse to pan
• Rotate
mouse button then the left
mouse button and move the
mouse to rotate
• Zoom
mouse button and click the left
mouse button then move the
mouse to zoom in and out
• Using the compass
• Drag the axes or planes of
the compass to dynamically
rotate the display
• Multi-select entities by
holding down the Shift key
Lecture 1

More Common Commands
• Copy/ Paste
 Geometry entities can be
copied and pasted from one
part to another.
 Paste Special allows you to:
• Paste a complete copy with
history
• Paste a linked copy
• Paste the result without
linking
• Undo/ Redo
 Allows you to undo previous
actions
 Redo repeats an action that has
been undone
• Hide/ Show
 Allows you to temporarily hide
entities from the display
 Hidden entities can be
recovered by clicking on the
“Swap visible space” icon, and
then selecting the entity to
make visible
• Update
 Used to update the part after
modification
Lecture 1

The Specification Tree
• The Specification Tree is displayed on the
left side of the screen while you are
working
• Provides access to the history of how a
part was constructed, and shows the
product structure
• Product entities can be selected from the
spec. tree or in the geometry area
• Parts can be modified by selecting them
from the spec. tree.
• Click on + to open a tree branch
• Solid Parts are stored in the PartBody
branch of the Part tree
Lecture 1

Getting Help
• The online help library can be accessed by selecting
the Help -> Contents, Index and Search command
• The Help home page provides a search facility, and
allows you to browse by application.
• Every CATIA task has a getting started guide
Lecture 1

Getting Help from the CATIA
Community
• For general information about CATIA from IBM and Dassault
Systemes refer to:
www.catia.com
• For access to the database of known problems refer to:
http://service.boulder.ibm.com/support/catia.support/databases
• The CATIA operator’s exchange provides a forum for the
exchange of ideas and advice about using CATIA at:
www.coe.org
• And look at Member Center -> Forum
Lecture 1

Part Design
• The Part Design application is used to create solid
models of parts
• Solid parts are usually created from 2D profiles that
are extruded or revolved to form a base feature
• The Part Design task is tightly integrated with a 2D
sketching tool
• A library of features is provided to allow user to add
additional details to a base part
• Parts can be modified by selecting their features in
the specification tree
• Parts are stored in files with the extension .CATPart
Lecture 1

Part Design
• Base Features
 Pad
 Pocket
 Shaft
• Reference Elements
 Point
 Line
 Plane
• Dress-up Features
 Fillets
 Chamfers
• Transformation Features
 Translation
 Rotation
 Mirror
 Pattern
 Scale
Slot
Hole
Groove
Draft Shell
Thickness
Lecture 1

Sketcher
• The sketcher is used to create 2D sketches of
designs, and apply constraints to the sketched
geometry
• The sketcher is now the main environment for
developing 2D profiles that will be used to build solid
models (but traditional 2D wireframe techniques are
available in the Wireframe and Surface application)
• The sketcher provides a flexible environment for
creating and modifying 2D geometry
Lecture 1

Sketcher
• Entering the sketcher
 Click on the Sketcher icon or
select Start -> Mechanical
Design -> Sketcher
• Exiting from the Sketcher
 Click on the Exit icon to leave
the sketcher and return to the
3D workspace
• Geometry Creation
• Geometry Operations
• Constraint Creation
• Tools Toolbar
 Snap to point
 Construction Geometry
 Constraint
Lecture 1

Using the Sketcher
• The Sketcher is a parametric design tool
• It allows you to quickly draw the approximate shape
of a design, and then assign constraints to complete
the shape definition
• Constraints can be applied as:
 Driving Dimensions – dimensions that control
the size of a geometric entity
 Geometric Constraints – geometric
relationships such as parallel, perpendicular,
tangent, collinear
Lecture 1

Sketching Example
1. Click on the Sketcher icon
2. Select the 2D plane to sketch
on (may be a plane, or the face
of an existing part), and the
sketching window will appear
3. Sketch the profile
4. Apply constraints to define the
exact geometry required
4. Click on the exit icon to quit the
sketcher
5. Sketch is transferred into the
3D modelling environment
Lecture 1

Sketching Tips
• To edit an existing sketch ensure that you select the sketch from
the specification tree, or select an element in the sketch. (If you
do not do this you will create a new sketch instead of modifying
the existing one)
• If the sketch goes purple while you are constraining it is over-
constrained. Generally it is best to Undo the last constraint and
examine existing constraints to find the problem before
continuing
• Solids can only be created from sketches that form a single
closed boundary
• The profile icon allows you to create complicated profiles
including lines and arcs. See the online help for more
information
Lecture 1

Creating a Solid Part from a Sketch
1. Click on the Pad icon to
create an extruded part
2. Select the sketch containing
the profile you want to
extrude (note the sketch is
treated as a single entity)
3. The Pad definition window
will appear
4. Select the limit type from:
 Dimension
 Up To Next
 Up To Last
 Up To Plane
5. Type in the length if required
6. Check the extrude direction
arrow
7. Click on OK to create the
Part
Lecture 1

Working with Features
• The Part Design task uses intelligent design features
• The features contain information about their context as well as
their shape
• For example a Hole feature can only be created once you have
created a part body
 A hole feature requires an attachment face, and driving dimensions
 A hole is a negative feature – it is automatically subtracted from the main
Part Body
• Other features include Pad, Revolve, Pocket, Groove, Thread,
Rib, Slot, Stiffener
• When a new feature is added to a solid part it is automatically
combined with the existing part
Lecture 1

Modifying a Part
• All parts created in Part Design can be edited at any time in the
life of the part
• The parameters used to create a feature can be accessed by
double clicking on the feature definition in the product
specification tree or on the part geometry
• For example to change the height of a pad you should double
click on the pad node in the specification tree.
• The original feature dialogue will appear on the screen
• Change the values and click on OK.
• When you have modified the feature parameters the part will
automatically update. The part turns red briefly to indicate that it
is out of date
Lecture 1

Assembly Design
• The Assembly Design application allows you to
create a product model from a number of separate
parts
• The parts in a product assembly are not joined
together, but assembled as they would be in a
physical assembly
• The product assembly structure is hierarchical and
allows you to model complex product relationships
• Constraints can be applied between the parts in
assembly to define relationships between them
Lecture 2

Assembly Design
• Product Structure Tools
 Insert New Component
 Insert New Product
 Insert New Part
 Insert Existing Component
 Replace Component
 Reorder Tree
 Generate Numbers
 Load Components
 Unload Components
 Manage Representations
 Multi-Instantiation
• Move Toolbar
 Manipulate
 Snap
 Explode and Assembly
• Constraints Toolbar
 Coincidence
 Contact
 Offset
 Angular
 Anchor
 Fix Together
Lecture 2

Benefits of Assembly Modelling
• Support for reuse of standard parts
 Assembly design creates links to the master geometry definition, so
multiple instantiations of parts can be efficiently created
 Design changes are automatically reflected in the assembly
 Model sizes are minimised because geometry files are not copied
• Management of inter-part relationships
 Mating Conditions
 Contact Constraints
• Development of Kinematics models
 Simple mechanisms analysis available
Lecture 2

Using the Product Structure Tree
• The specification tree shows product
structure information relating to the
parts and sub-assemblies contained
in an assembly
 In the example shown on the right the
product is called Product1
 The product contains three components
CRIC_FRAME, CRIC_BRANCH_3 and
CRIC_BRANCH_1.
• The Product and the Components do
not contain any geometry
 Geometry is stored in parts inside the
Component definitions
 The Constraints Branch shows the
constraints that have been created to
define the relationships between the
components in the product structure
Lecture 2

Steps for Creating an Assembly
1. Create a new CATProduct using File -> New ->
Product.
2. Use the Product Structure tools to lay out the main
assembly structure
3. Use Insert Existing Component or Insert New
Part to create geometry in the Assembly
4. Use Constraints to capture the design relationships
between the various parts in the assembly
Lecture 2

Saving Assembly Information
• Assembly information is stored in a file with the extension
.CATProduct.
• The CATProduct file contains only information relating to the
product assembly.
• The detailed geometric information about the parts in the
assembly is referenced to the original .CATPart files
Warning
 If you copy a.CATProduct file it will still point to the original part files
 To copy an entire assembly use File -> Save All As… , specify a new
location for the .CATProduct file, then click on the Propagate button.
Lecture 2

More Advanced Part Design
• Boolean Operations
• Transforming Parts
• Assigning Materials
• Calculating Mass Properties
Lecture 2

Using Boolean Operations
Lecture 2

Using Boolean Operations
• To use the traditional Boolean operations approach to
solid modelling you must create multiple bodies
within a part.
• Create additional Bodies by selecting the function
Insert -> New Body
• Boolean operations (join, subtract, intersect) can only
be applied between the main PartBody, and other
bodies in the same Part
Lecture 2

Transforming Parts
• Solid features can be transformed using the
transform functions
• Features can be mirrored, translated, rotated and
scaled
• Patterns are used to created rectangular or circular
arrays of features
Lecture 2

Assigning Materials
• To Assign a material click on the Materials Icon on
the toolbar
• Select a material from the material library
• Click on the part you wish to assign the material to,
then click on Apply Material and OK. The material
will appear on the properties branch in the spec tree
• Note: You may need to change the option settings
To make the parameters branch of the specification
tree visible. To do this select
Tools->Options->Infrastructure->Product Structure
Specification Tree -> Parameters
1.
Lecture 2

Calculating Mass Properties
• Select the node of the part you want to analyse in the
specification tree
• Click on the Measure Inertia icon
Or
• Select Properties from the popup menu on the right
mouse button to see the properties form, select the
Mass tab and view the properties:
Lecture 2

Wireframe and Surface
• The Wireframe and Surface task provides a more
traditional CAD 3D modelling environment
• The Wireframe functionality allows you to create
Wireframe points, lines and curves in 3D space,
without using the constraint based approach of the
sketcher
• The Surface functionality allows you to create smooth
freeform surfaces by sweeping Wireframe curves
through 3D space
• Wireframe and Surface is integrated with the other
CATIA applications allowing for hybrid surface and
solid modelling
Lecture 3

• Wireframe Toolbar
 Create Point
 Create Line
 Create Plane
 Create Projections
 Create Intersections
 Create Circle
 Create Spline
 Corner
 Create Parallel Curves
 Create Boundary Curves
• Surface Toolbar
 Extrude Surfaces
 Surface of Revolution
 Offset Surface
 Sweep Surface
 Create Filling Surface
 Loft Surface
 Blend Surface
 Extract Geometry
Lecture 3

• Operations Toolbar
 Join
 Split, Trim
 Transform
• Tools Toolbar
 Update
 Axis
 Work with Support
 Snap to Point
 Create Datum (deactivate History)
• Transformations Toolbar
 Translate
 Rotate
 Create Symmetry
 Scale
 Affinity (irregular scaling)
Lecture 3

Creating Wireframe Geometry
• Wireframe geometry can be created in
3D space, or on a 2D plane (using a
support)
• Each wireframe function has a number of
different methods (e.g.a line can be
created from point to point, or parallel to
an existing line, or many other ways).
• Existing geometry can be selected by
picking on the screen or selecting from
the spec. tree
• Additional options may be available by
pressing the right mouse button over the
input box
Lecture 3

Creating Surface Geometry
• Surfaces are usually created
using a wireframe skeleton
• For example the Loft function
requires 2 or more cross
section curves
• It also optionally accepts a
number of guide curves that
extend between the cross
curves
• A spine curve can be used to
define the shape of the loft
Lecture 3

Using the Specification Tree with
• Wireframe and Surface Geometry
is created in an “Open Body”
within the Part definition
• Geometry in the open body is not
“attached” to the main part
• New Open bodies can be created
using the Insert -> Open Body
command
• A part can contain both Open
Body and Part Body information
Lecture 3

Wireframe and Surface –
Hints and Tips
• If you want to repeatedly use the same function (e.g.
to create multiple points) double-click on the icon.
The dialogue will remain open after you click on OK.
• It can be very useful to create planes to use as a
support when creating geometry.
• When creating surfaces take care that the underlying
wireframe geometry is consistent, and curve
endpoints are all matched
• When creating surfaces ensure that curve
orientations are consistent
Lecture 3

Solid – Surface Integration
• The Part Design Application
provides a Surface Based
Features toolbar to allow you
create solid bodies from
surface models.
• Solids created from surfaces
are generally more difficult to
modify that solids generated
in part design
• The solid part maintains
associativity to the surfaces
it was generated from
• Surface Based Features
 Split – Uses a surface to split a
solid object
 Thicken – Creates a solid body
by “thickening” an existing
surface
 Close Surface – Creates a
Solid body from a closed set of
surfaces
 Sew Surface – Joins a surface
to a solid body
Lecture 3

Generative Drafting
• The Generative Drafting Application allows you to
create engineering drawings from parts or
assemblies
• Generative Drafting automatically lays out
orthographic projections of a part onto a drawing
sheet
• Traditional Drafting functions can be used to annotate
the drawing layout
• Drawings are stored in files with the extension
.CATDrawing
Lecture 3

Generative Drafting
• Views Toolbar
 Create a Front View (other
views available underneath
icon)
 Create a section view
 Create a detail view
 Create a Clipping View
 Create Views Via Wizard
• Automatic Dimension
Creation
 Auto-dimension
 Semi-Automatic Dimensions
Lecture 3

Interactive Drafting
• Allows you to create engineering drawings without
first creating a 3D part
• Provides 2D drawing functionality to create geometry
layouts
• Provides dimension and dress-up facilities for
drawing annotation
• Can be used to add additional information to a
drawing created using Generative Drafting
Lecture 3

• Geometry Creation
 Point
 Line
 Circle
 Arc
 Profile
 Curve
 Pre-Define Profiles
• Transformations Toolbar
 Translate, Rotate, Scale, Mirror
• Relimitations Toolbar
 Corner
 Chamfer
 Trim
 Break
• Annotation
 Text
 Symbols
Lecture 3

• Dimensions Toolbar
 Create Dimension
 Create Tolerance
• Dress up Toolbar
 Centreline
 Thread
 Axis
 Fill
 Arrow
Lecture 3

Drafting Example
• Create a new
Drawing
using File ->
New…
• Select the
drawing
Format and
Scale
• The drawing sheet will
appear on the screen
Lecture 3

Drafting Example
• Use File -> Open… to open the
3D part you want to generate a
drawing from
• It is useful to arrange the screen
so that you can see both views
before continuing
• Use the View Creation toolbar
to create a new view
• Click on the Front View icon,
then select a plane on the 3D
model to specify the view
orientation
• A preview of the view will
appear in the corner of the
3D window
• Click on the drawing sheet to
generate the view
Lecture 3

Drafting Example
• You can generate
orthographic projects from
an existing view using the
Projection View icon
• Sections and detail views
can also be generated from
existing views
Lecture 3

Importing Geometry from External
Systems
• CATIA provides import translators for many standard geometry
formats including
 IGES, STEP AP203, DXF/ DWG,
• Use File -> Open to import an external file
• The options to control the import parameters are available in
 Tools -> Options -> Product -> External Formats (check)
• Imported CAD geometry does not contain any history
information
• Check the online help for more information about the types of
entities that can be translated
Lecture 3

Exporting CATIA geometry to other
CAD systems
• CATIA provides export translators for a number of
standard formats including:
 IGES, STEP AP203, DXF/ DWG, VRML, CGM
• Use File -> Save As… , then select the desired type
in the Save As Type box to export a file in an
external format
• Exported geometry does not have any history
associated with it
• Check the online help for more information about the
types of entities that can be translated
Lecture 3

Generative Part Structural Analysis
• Generative Part Structural Analysis allows you to
perform a finite element analysis on a solid part
• It is highly automated and allows an analysis to be
performed with the minimum of interaction from the
user
• Generative Part Structural Analysis provides very
limited mesh control, and can only be applied to solid
geometry
• It is generally used as a “quick check” for structural
analysis
Lecture 3

• Mesh Specification Toolbar
 Local Mesh Size
 Create Connections
 Create Virtual Parts
• Equipment Toolbar
 Created distributed and lumped
masses
• Restraints Toolbar
 Create Clamp
 Create Slider
 Create Ball Joint
• Loads Toolbar
 Create Pressure
 Create Distributed Force
 Create Acceleration
Lecture 3

• Compute Toolbar
 Specify External Storage
 Compute Static Solution
 Compute Frequency Solution
 Compute Buckling Solution
• Image Toolbar
 Visualise Deformations
 Visualise Von Mises Stresses
 Visualise Displacements
 Visualise Principle Stresses
• Analysis Toolbar
Lecture 3

Steps for Performing an Analysis
1. Select the parts or features for analysis
2. Define any connections, attached parts and non-
structural masses
3. Specify loads and restraints acting on the part
4. Submit the job for analysis
5. Visualise Results
Lecture 3

Parameters and Formulas
• CATIA V5 contains a group of applications that
provide CATIA Knowledgeware capabilities
• These tools allow you to perform design automation,
and capture non-geometric information about a
product
• The most basic Knowledgeware tool is the
Knowledge Advisor
• Using Knowledge advisor you can create parameters
and relationships relating to parts
Lecture 3

Knowledge Advisor
• CATIA stores information about a part in form of
parameters
• Formula function – allows you to create new
parameters and create relationships between existing
parameters.
• Rules function – allows you to define design rules
relating to design parameters in a part or product
• Parameters and Relations are displayed in the
specification tree
Lecture 3

Knowledge Advisor Example
• This relations branch shows two formulas:
 The value of the diameter Radius.1 is set equal to 2* the diameter
of Hole.1 in the part
 The value of the user defined parameter PadLength is set equal to
the sum of the two limits on Pad.1
Lecture 3

CATIA V5 Lectures.ppt

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