Airbus Catia V5 Wireframe and Surface

5/20/2018 Airbus Catia V5 Wireframe and Surface

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AIRBUS UK CATIA V5 Foundation Course

DMS42189 Page 1 of 17 Issue 1

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Compiled by: Kevin Burke

Kevin Burke

Date: 16/Apr/2003

Approved by:

Date:

Authorised by:

Date:AIRBUS UK Ltd. All rights reserved.

Foundation Course

Wireframe andSurfacing Overview


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Contents

Session 7 An overview of Wireframe and Surfacing...........3An Introduction to Generative Shape Design ........................................................... 4

Accessing the Generative Shape Design Workbench ............................................... 5

Generative Shape Design Toolbars and Icons........................................................... 6

Extrude Surface ..................................................................................................... 7

Offset Surface........................................................................................................ 8

Loft Surface......................................................................................................... 10

Fill Surface .......................................................................................................... 12

Projection ............................................................................................................ 13

Split Surface ........................................................................................................ 14

Join Surface ......................................................................................................... 15

Extrapolate Surface ............................................................................................. 16

Intersection .......................................................................................................... 17


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Session 7 An overview of Wireframe

and Surfacing

On completion of this session the trainee will:

Be able to access the Generative Shape Design Workbench.

Be capable of creating Extruded Surfaces.

Be able to create Offset Surfaces.

Have a basic understanding of how to Loft a Surface.

Be able to create a basic Fill Surface.

Be able to Project elements onto Surfaces and Split them.

Use the Join command to Join Surfaces together.

Create an Extrapolated a Surface.

Be able to Intersect Surfaces.


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An Introduction to Generative Shape Design

There are various Workbenches within Catia where you can create both wireframe

and Surface type elements. The majority can be found under the Shape and

Mechanical Design Functions.

For the purpose of this overview into Wireframe and Surfacing we will be using the

Generative Shape Design Workbench.

Geometry created using this and other surfacing workbenches is placed in an Open

Body node rather than a Partbody. An Open Bodycan contain both Wireframe and

Surface geometry but not Solids. As with Partbodies you can have multipleOpenbodies within a CATPart.

Sketches can be created in either a PartBodyor an Open Body. You can move a

Sketch from an Open Bodyto a PartBodyby selecting the Sketch node with MB1

and then using Cutand Pastefrom the Editdrop down menu or the MB3contextual

menu to perform the move. You can also create copies of the Sketch by using Copy

and Paste.

As you create geometry it will automatically be attached to the currently active Open

Bodywhich is identified by the node being underlined.

To add a new Open Bodyto the Specification Tree Select Open Bodyfrom theInsertdrop down menu when you are in one of the Surfacing Workbenches.

Currently

Active

Open Body


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Accessing the Generative Shape Design Workbench

The Generative Shape Design Workbench can be accessed through the Shape

Function from the Startdrop down menu.


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Generative Shape Design Toolbars and Icons

The two Toolbars that we will be

concerned with during this session are: -

1. The Surfacestoolbar this allows

you to create surfaces

2. The Operationstoolbar allows you

to manipulate Surfaces.

Replication

Advance

Surfaces

Operations

Wireframe

Surfaces

Laws

Sketcher

Workbench Icon

Selection

The Generative

Shape Design

commands can

also be access

through the

Insertdrop down

menu


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Extrude Surface

The first command that we will cover is Extrude Surface, which can be found on theSurfacesToolbar.

This command will allow you to Extrudea selected profile to form a single or

group of joined Surfaces.

Select the icon to display an Extrude Surface Definition panel.

The Profilefield displays the name of the element or

Sketch that you have selected as the Profile to be

extruded.

The Directionlists the element that is used to define

the direction of the extrusion. By default when a Sketch

is selected then a plane normal to the Sketch plane is

used. By highlighting this field you can select your

direction element i.e. a Line or Plane.

The Extrusion Limitsportion of the panel control the

overall length of the extrusion by using the Limit 1and

2fields to enter distances which are applied to either

side of the profile plane. You can also Grabthe LIM1

and LIM2using MB1to control the length of theLimits.

The Reverse Directionbutton reverses the direction of the limits.

After selecting the profile to be extruded, a direction element if desired and distance

for the limit you have to click OKto complete the command.

Selected

Profile

Resulting

Surface


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An Extrudenode is attached to the Specification in the currently active Open Body.

Offset Surface

This command allows you to create an Offset Surfacefrom an existing

Surface, and can be found on the SurfacesToolbar.

Select the icon followed by a Surface to offset from. An Offset Surface Definition

panel will appear with the following options: -

The Surfacefield displays the name of the Surface

you selected to offset from.

The Offsetfield allows you to enter a distance for theoffset. You can also Grab the Green Offset marker to

control the distance

The Parameterstab allows you to Reversethe

Directionof the Offset, you can also use the orange

arrow to reverse direction. If you check the Both sides

check box then the offset is created either side of the

selected Surface. Selecting Repeat object after OK

check box will allow you to reuse the command to

create multiple offsets using the Offset value as a Step

size.

The Sub-Elements to Removetab allows you to run analysis on the intended offset

containing more than one surface. Errors can be detected and Sub-Surfaces or

elements can be removed from the Offset.


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In the following example an Extruded Surface is offset by 50mm. The resulting offset

Surface is dependent upon the Extrude, therefore, if you delete the Extruded Surface

then the offset will be deleted as well.

Reverse

Direction

Arrow

Offset

Marker

Resulting

Offset

Surface

After clicking OKthe

Surface is create and

Offset node is added

to the currently active

Open Body


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Loft Surface

Allows you to create a Lofted Surface through a series of selected Profilessimilar to the Loft command in the Part Design Workbench.

Select the icon which located on the Surfaces

Toolbar to display a Loft Surface Definition

panel.

The top portion of the panel displays which

profiles have been selected and the order that

they have been selected.

Note: At least two non-intersecting profilesmust be selected.

The bottom portion as five tabs: -

The Guidestab lists the selected guides. The

purpose of guides is to control how the Loft

cross section is controlled between the profiles

The Spinetab lists any Spine that is used. When aSpineis use, the transition shape between profile

is kept normal to the Spine curve. By default if no

spine is selected then Catia will compute one

based on the profiles and their orientation to each.

Both the spine and guides are optional.

The Couplingtab allows you select how the

transition is mapped between profile. The are

four Section couplingoptions: -

Ratiomaps the profiles together by a curvature

ratio.

Tangencymaps the profiles together by their tangent discontinuity

points. If there are not the same number of points in each curve then this option will

cause the Loftto fail.

Tangency then curvaturemaps the profiles together by their curvature discontinuity

points. As with tangency if there are not the same number of points in each curve then

this option will cause the Loftto fail.


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Verticesmaps the vertices of the profiles together. Again there must be the same

number vertices in each profile for the Loft command to succeed.

The Relimitationtab allows you to re-limit the

start and end sections of the Loft. The two

options are to limit the loft to the first profile

and the last profile. If either of these options is

not selected then the Spline curve or the Guide

curves control the relimit.

The final tab on the panel is the Conical

Surfacetab allows create Conical Surfaces

The same rules apply to Lofting Surface as with creating a Lofted

Solid i.e. the Closing Points must by aligned to prevent twist of the

loft between Profiles.

After you have selected at least two Profiles and the desired option

click OKto create the Loft. A Loftnode is then added to the

Specification Tree in the currently active Open Body.

In the following example a lofted surface is created using twoSketches containing multi-element Profiles. The cross-sectional

shape of the loft is controlled by two Guide Profiles contained

within two different Sketches. The Couplingpoint has been set to Vertices.

Profile 1

Guide

Profile 2

Profile 2

Guide

Profile 1


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Fill Surface

Located on the SurfacesToolbar this command you can create a Surface to filla gap between surfaces.

Select the icon to display a Fill Surface

Definitionpanel.

The Boundary portion of the panel lists the

edge boundary of the Surface that you have

selected to form the Fill.

Note: You must select the edges in a

logical sequence with no gaps otherwisethe fill will fail.

You can apply Tangency to the Fill

Surface by selecting the Support Surfaces

as well as the Edge curves and Select

Continuity Tangent.

After selecting the required Edges and

Supports, if required, click OKto create

the Fill.

A Standard Fill with just four

Edges selected with no Support

Surfaces selected.


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Projection

This allows you to Project Elements on to a Surface. This icon can be found onthe WireframeToolbar.

Select the icon to display a Projection Definition

panel.

You must select an element or Sketch to be projected,

which will then be displayed in the Projectedfield.

You then have to select a Surface to project the

element to be projected onto. This is displayed in the

Supportfield.

The Nearest solutioncheckbox if selected will limit the projection to the first

element found on the Support.

Finally the Projection typebutton allows you to specify whether the projection is

Normalto the Support or Along a Direction which you must specify by selecting a

Line or a Plane.

In the following example a sketch containing a rectangular Profile is Projected onto

the nearest element of a Loft.

After selecting the required

elements to Project and use as

the Support click OKto create

the Projected elements and a

Project node is attached to the

Specification Tree under the

currently active Open Body.

Resulting

Project

Elements


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Split Surface

This icon is located on the OperationsToolbar and can be used to SplitSurface based features.

Select the icon to display a Split Definitionpanel.

You have to select an element to Split, which will

then be listed in the Element to cutfield. This is to

be followed by the element(s) that are to be used as

Splitting elements which can be a group of separate

elements or a single profile contained in Sketch and

these are listed in the Cutting elementswindow.

The Other sidebutton reverses which portion of the

Split is kept.

There also the option to keep both portions of the

split by selecting the Keep both sidescheckbox. In

this case when you click OKto create the Split then

two Split operations appear in the Specification Tree.

Splitting

Profile

Surface to

be Split

Resulting Split

as remove a

portion of the

Surface

After clicking OK a Split

node is attached to the

Specification Tree under

the currently active Open

Body


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Join Surface

The Join Surfacecommand allows you to join Surface based features orCurves together. When selecting Surfaces if the Join produces an enclosed

volume then it can be converted into a Solid feature within the Part Design

Workbench by using the Close Surfacecommand. The icon for this command is

located on the OperationsToolbar.

After selecting the icon a Join Definition

panel will appear.

The Element to Joinportion list the

Surfaces or Curves that you have selected

to Join.

The Parameterstab allows you to control

the how the selected elements are joined.

The Federationtab allows you to group

selected elements together.

The Sub-Elements to Removeallows you

to remove Sub-Element from the Join list

i.e. elements from Sub-Element created by

a previous Joincommand.

To complete this command select the

elements to be joined and any desired

options followed by clicking OKto create

the Join. A JoinNode will be added to the Specification Tree under the currently

active Open Body.


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Extrapolate Surface

With this command you can create an extension to an existing Surface. TheExtrapolateicon can be located on the OperationsToolbar.

After selecting the icon a Extrapolate Definition panel will appear with the following

options: -

The Boundaryfield lists the element that you have

selected as the edge of the existing surface to be

extended.

The Extrapolatedfield lists the existing Surface that you

have selected to extend.

The Limitportion of the panel controls whether you

extend the Surface by Lengthor Up to Elementvia the

Typebutton. If Lengthtype is selected then you can

enter the value in the Lengthfield and if Up to Element

is selected then you must select an element to control the

extension which will then be displayed in the Up tofield.

The Continuity, Extremitiesand Propagation mode

buttons allow you to specify whether the extension is

Tangentor Curvaturecontinuous.

The Assemble result checkbox if selected joins the extension to a copy of the original

Surface.

After selecting the Boundary, the Surface to be Extrapolated, Limittype

and the extension method click OKto create the Extrapolation. An

Extrapolatenode is then attached to the Specification Tree under the

currently active node.

Surface to be

Extrapolated

Selected

Boundary

Result

extendedSurface


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Intersection

The final command covered in this session is the Intersectioncommandwhich is use to intersect two elements together to create an intersect element.

The icon for this command can be found on the WireframeToolbar.

Select the icon to display the Intersection Definition

panel.

The Firstand Second Elementfield lists the elements

you have selected to Intersect.

The other options are not selectable.

After selecting the elements to be intersected click OK

to create the intersection element. This will also result

in an Intersectnode being added to the Specification Tree.

Two elements

to be

Intersected.

The Intersect

node

The resulting

Intersect

element

Airbus Catia V5 Wireframe and Surface

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