Airbus Catia V5 Wireframe and Surface

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Transcript of Airbus Catia V5 Wireframe and Surface

AIRBUS UK

CATIA V5 Foundation Course

Foundation Course Wireframe and Surfacing OverviewCompiled by: Kevin Burke Approved by: Authorised by:

Kevin BurkeDate: 16/Apr/2003 Date: Date: AIRBUS UK Ltd. All rights reserved.

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CATIA V5 Foundation Course

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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CATIA V5 Foundation Course

Session 7 An overview of Wireframe and SurfacingOn 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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CATIA V5 Foundation Course

An Introduction to Generative Shape DesignThere 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 Body can contain both Wireframe and Surface geometry but not Solids. As with Partbodies you can have multiple Openbodies within a CATPart.

Currently Active Open Body

Sketches can be created in either a PartBody or an Open Body. You can move a Sketch from an Open Body to a PartBody by selecting the Sketch node with MB1 and then using Cut and Paste from the Edit drop down menu or the MB3 contextual 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 Body which is identified by the node being underlined. To add a new Open Body to the Specification Tree Select Open Body from the Insert drop down menu when you are in one of the Surfacing Workbenches. DMS42189 ANS-UG0300112 Page 4 of 17 Issue 1

AIRBUS UK

CATIA V5 Foundation Course

Accessing the Generative Shape Design WorkbenchThe Generative Shape Design Workbench can be accessed through the Shape Function from the Start drop down menu.

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CATIA V5 Foundation Course

Generative Shape Design Toolbars and Icons

Workbench Icon Replication

The two Toolbars that we will be concerned with during this session are: -

Selection

1. The Surfaces toolbar this allows you to create surfaces 2. The Operations toolbar allows you to manipulate Surfaces.

Sketcher

Advance Surfaces

Wireframe

Operations

Laws

Surfaces

The Generative Shape Design commands can also be access through the Insert drop down menu

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Extrude SurfaceThe first command that we will cover is Extrude Surface, which can be found on the Surfaces Toolbar. This command will allow you to Extrude a selected profile to form a single or group of joined Surfaces. Select the icon to display an Extrude Surface Definition panel. The Profile field displays the name of the element or Sketch that you have selected as the Profile to be extruded. The Direction lists 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 Limits portion of the panel control the overall length of the extrusion by using the Limit 1 and 2 fields to enter distances which are applied to either side of the profile plane. You can also Grab the LIM1 and LIM2 using MB1 to control the length of the Limits. The Reverse Direction button 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 OK to complete the command.

Resulting Surface

Selected Profile

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

Offset SurfaceThis command allows you to create an Offset Surface from an existing Surface, and can be found on the Surfaces Toolbar. Select the icon followed by a Surface to offset from. An Offset Surface Definition panel will appear with the following options: The Surface field displays the name of the Surface you selected to offset from. The Offset field allows you to enter a distance for the offset. You can also Grab the Green Offset marker to control the distance The Parameters tab allows you to Reverse the Direction of 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 Remove tab 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. Offset Marker

Reverse Direction Arrow

Resulting Offset Surface

After clicking OK the Surface is create and Offset node is added to the currently active Open Body

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Loft SurfaceAllows you to create a Lofted Surface through a series of selected Profiles similar 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 profiles must be selected. The bottom portion as five tabs: The Guides tab lists the selected guides. The purpose of guides is to control how the Loft cross section is controlled between the profiles

The Spine tab lists any Spine that is used. When a Spine is 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 Coupling tab allows you select how the transition is mapped between profile. The are four Section coupling options: Ratio maps the profiles together by a curvature ratio. Tangency maps 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 Loft to fail. Tangency then curvature maps 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 Loft to fail.

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Vertices maps the vertices of the profiles together. Again there must be the same number vertices in each profile for the Loft command to succeed. The Relimitation tab 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 th