part design fundamentals

8/11/2019 Part Design Fundamentals

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1 Activate the Edge fillet iconand select the edge to be

2 Select the More button in thedialog box 3 Select the Edge(s) to keep

field

Creating a Fillet with Keep Edge : Rolling on an Edge


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Copyright DASSAULT SYSTEMES 2002 94

and select the edge to befilleted

(2)

(1)

4 Select the edge on whichthe fillet will roll

You get :

(3)

(4)

5 Enter the radius value (eg : 30) thenselect OK

(5)

Note : This option is also available with the variable fillet function

1 Activate the Edge fillet iconand select the edges to be

2 Select the More button in thedialog box

3Select the Edge(s) tokeep field

Creating a Fillet with Keep Edge : Rolling around an Edge


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and select the edges to befilleted

(2)

(1)

4 Select the edge on whichthe fillet will roll

You get :

(3)

(4)

5 Enter the radius value (eg : 5) thenselect OK

(5)

Note : This option is also available with the variable fillet function

Edge Fillet with Limiting Planes, Faces or surfaces (1/3) You can limit the propagation of an edge filletusing a plane, a face or a surface

Select the Edge Fillet icon1


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Select the Edge Fillet icon1

Select the edge on which you want tocreate a fillet

2

To expand the dialog box,select the More button3


Select the Limiting elementfield

4 Select the limiting surface5


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field

Select to changethe direction6


Select OK in the dialog box7


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You get:

Edge Fillet: Trim RibbonsWhen choosing the Tangency propagation mode, you can also trimoverlapping fillet. To do so, simply check the Trim Ribbons option inthe dialog box

Select the Edge Fillet icon1 Select the edges to be filleted2Modify the fillet radius and activateh T i Ribb i3


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g1 Select the edges to be filleted2 the Trim Ribbons option3

Select OK in the dialogbox

4

You get:


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l h f b

Select TritangentFillet icon

Multi-select two faces to befilleted

1

Tritangent Fillets2


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Select the face to beremoved by the fillet

3

Multi-selecting all three faces tellsCATIA to remove the third face selected

You get:

Select edge tobe filleted

1 Select Variable RadiusFillet icon

Variable Radius Fillets2


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By double clicking,modify the radii

3

You get:

Variable Radius Fillet: Circular Close Edge (1/2)

Select the Variable S l h P i fi ldS l h d b fill d

It is possible to build a variable radius fillet on a circularclose edge


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Select the VariableRadius Fillet icon

Select the Points field1 2 3Select the edge to be filleted

4 Deselect the defaultvertex

Select the two new vertices5


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Once an edge has been selected during a variable radius fillet creation, two radiuslabels appear at the edge extremities. If you modify the radius value in the dialogbox, the two radius label will be modified at the same time. If you want to modifyonly one of the radii you will have to double click on the radius label and modify

Radius Definition per Edge when Creating a Variable Radius Fillet


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1 Select the Variable fillet icon 2 Select the edge to befilleted

only one of the radii, you will have to double click on the radius label and modify

its value

3 Enter a new radius value( eg :10)

4 Notice that the two radius values aremodified at the same time

To add additional points on the edge to be filleted, you can select planes.CATIA computes the intersections between these planes and the edge to

Variable Radius Fillets

Additional Information (1/2)


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Variable radius fillet

CATIA computes the intersections between these planes and the edge todetermine the useful points. In this example, three planes were selected. Now, ifyou move these planes later, CATIA will compute the intersections again andmodify the fillet accordingly. The intermediate radii can be nil

Capability to create a variable radius fillet with thefillet sections keeping a constant direction inaccordance with a spine

The fillet sections areperpendicular to the spine



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Spine

The fillet sections areperpendicular to filleted edge

Edge to befilleted

The dotted blue circles indicate the fillet sections but CATIADOES NOT SHOW THEM when creating a fillet

With spine

Without spine


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Chamfering consists in removing or adding a flat section from a selectededge to create a beveled surface between the two original faces common tothat edge. You obtain a chamfer by propagation along one or several edges.

What is a Chamfer ?


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Propagation modes

Tangency

Minimal

Creating Chamfers ... To create a chamfer, you need to select the edge to be filletedand to enter the chamfer dimensions


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Select the edge to be

chamfered

1

Enter the chamferdimensions

2

OK to validate3

Multi-select edgesto be chamfered

1 Modify Chamferdefinition

3

Symmetric Chamfer


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Select Chamfericon

2

You get:


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Chamfers can be created by selecting a face whose edges areto be chamfered

Chamfers

Additional Information...


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Select face Chamfer


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Creating Pads with Integrated Draft and Fillets ... To create a pad with integrated draft and fillets, you need toselect a profile then enter the pad dimensions


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Select the profile1

Enter the paddimensions

2

OK to validate3

(1)

1 Select the Drafted Filleted Padicon

The Drafted Filleted Pad function allows you to create a pad which includes ageneral draft, a Lateral Radius, a First Limit Radius and a Second LimitRadius. The draft angle and the radii are created as individual features

4 Enter the pad Length

5 Enter the draft angle

Drafted Filleted Pad


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2 Select the sketch that willbuild the pad

(2)

3 Select the second limit

(3)

5 Enter the draft angle

6 Enter the lateral radius

7 Enter the First limit radius

8 Enter the Second limit radius

9 If necessary, reverse the paddirection

10 Select OK

You get :First limitradius

Secondlimitradius

LateralRadius

DraftAngle

By default, the neutral element used tocompute the draft angle is the first limit ofthe pad. However, you can use the secondlimit as the neutral element


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Drafted Filleted Pocket

You w i l l learn how to c rea te a poc ket which inc lud esfi l le ts and a draft angle

This funct ion wil la l lowyo utocrea teapocketwi thdraf t


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Drafted Filleted Pocket

This func t ion wi l l a l low yo u to c rea te a pocket wi th draf tand f i l le ts s im ul taneous ly, ra ther than crea ting eachfeature separately

What is Pocket with Integrated Draft and Fillets ? A pocket with an integrated draft angle and fillets is a solid which is extruded from a 2D profile, andwhich includes fillets and draft angle


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LateralRadius

DraftAngle

Firstlimitradius

Secondlimitradius

Creating Pockets with Integrated Draft and Fillets To create a pocket with integrated draft and fillets, you need toselect a profile then enter the pocket dimensions


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1

2

3

Select the profile

Enter the pocketdimensions

OK to validate


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After a drafted filleted pocket creation, the tree contains :


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A pocket A draft angle Three fillets

You w i l l learn how to sh e l l 3D par t

Shelling a Part


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Shelled Part

Shelling a feature means emptying it, while keeping a giventhickness on its sides Shelling may also consist in adding thickness to the outside You can have different thicknesses per faces

What is Shelling ?


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Faces to be removed

ShellOther thickness face

Creating Shells ... To create a shell, you need to select the face(s) to be openedthen to define the thickness(es) of the shell


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Select the face to beopened

1

Enter the shellthickness

2

OK to validate3


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Shelling a feature means emptying it, while keeping agiven thickness on its sides. Shelling may also consist inadding thickness to the outside

Thickness inside & outside



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Inside only Inside &Outside

It is possible to create a shell with a thickness greaterthan the smallest fillet radius on the part

Shell with Thickness > Curvature

Faces to be removed

Modified thicknesses Dotted blue lines = Cube before the shell operation

R5

Thickness=15

You wi l l learn how to c rea te threads and taps

Thread and Tap


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Creating Thread and Tap ... To create a thread:


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Define the Lateraland Referencesurface

1

Define the threadparameters

2

The threadappears in the

tree

3


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7 Select the Preview button inthe dialog box, you will get apreview of the thread

8 Select the OK to validate thethread creation

Creating Thread and Tap (2/2)


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You get:

During the thread creation CATIA helpsyou with the thread parameters inaccordance with the selected standard

You w i l l learn how to c rea te pa t terns o ut of anexis t in g feature

Creating Patterns


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Rectangular PatternCircular Pattern

User Pattern

Patterns allow you to create several identical features from anexisting one and to simultaneously position them on a part

What is a Pattern ?


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Rectangularpattern

CATIA allows you to define three types of patterns which makes

the creation process easier : rectangular circular user patterns

3 types of patterns

Pad with patternfeature

Creating Patterns ...


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Select feature to beduplicated

1

Select thedirections then fill

the dialog box

2

OK to validate3

Select RectangularPattern icon

then select S if th d di ti i t3

Specify the first direction of the pattern by selecting an edgeusing Reverse to change the direction if needed

2Rectangular Pattern

1


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then selectpocket to usefor pattern

Specify the second direction as in step2 under the Second Direction tab (Reverse if necessary)

3

You get:

Select the feature to bepatterned

1 Select Circular Patternicon

Define pattern parameters and specify therotation axis of the pattern by selectingthe face

3Circular Pattern

2


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You get:

Select UserPattern icon

Select hole to be patterned1

Select 'Sketch 4' in the specificationtree. This sketch includes the ninepoints you need to locate theduplicated holes

3User Pattern

2


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You get:

1 With the Ctrl key held down, select the hole and the fillet(you can select them from the solid or from the tree) 2

Activate the Circular patternicon

It s possible to apply a rectangular, circular or user pattern to several features inone shot. We are going to apply a circular pattern to a hole and a fillet

(2)

Pattern of a Selection of Features (1/2)


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(2)

3 Select the Reference field

(1)

4 Select the circular edge to definethe pattern axis of rotation

(3)

(4)

5 Select the Instance(s) field andenter 6

6 Select the Angular spacing fieldand enter 60

(6)(5)

7 Select the Crown Definition tab

It s possible to apply a rectangular, circular or user pattern to several features inone shot. We are going to apply a circular pattern to a hole and a fillet

(7)

8 Select the Circle(s) field and enter 4

Pattern of a Selection of Features (2/2)


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(10)

9 Select the Circle spacing fieldand enter 20

(9)

10 Select OK

You get :

(8)

Exploding a PatternCapability to explode a pattern in order to get one feature perinstance

Select the Update icon

2Select the Explode command from thepattern contextual menu

1


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You get:

2 Select the planar face (or plane) that will be the plane ofsymmetry

1 Activate the Mirror icon

Before building a part, you can search for the symmetry and decide to build onlythe half of the part, then use the Mirror function to get the whole part

(2)

Mirror


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(1)

3 Select OK

( )

(3)

You get :

1 With the Ctrl key held down, select the pad (Pad.2) and thetwo last fillets (you can select them from the solid or from

the tree)

2 Activate the Mirror icon

It s possible to apply a Mirror to several features in one shot

(2)3 Select the Mirroring element

Mirror of a Selection of Features


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3 Select the Mirroring element(plane or planar face)

(1)

4 Select Ok in the dialog box

(3)

(4)

You get :

Deleting the instances of your choice is possible when creatingthe pattern. In the pattern preview, just select the pointsmaterializing instances. Conversely, selecting these points again

will make CATIA create the corresponding instances

Deleting or adding instances at creation



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Instances selection

To define a direction, you can select an edge or a planar face. Selecting aface will allow both directions of a rectangular pattern to be defined or theaxis of rotation normal to the face for a circular pattern

Direction of creation


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Modifying PartsYou w i l l l ea rn how to m odi fy p rof i les and fea tures to change 3D par t


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Modifying Profile GeometryReordering FeaturesModifying Features

You w i l l learn how m odify 2D ske tch e lem ents toprop agate changes to 3D par ts

Modifying Profile Geometry


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After ChangeBefore

Sketch-based features rely on profiles for their shape Especially if defined with the proper constraints that represent thedesign intent of the part, the profile geometry can easily be changed fordownstream design changes

Why Modify Profile Geometry?


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Modified cube

Chamfer added fromsketch

Changing the sketch that defines a feature propagates thatchange to all subsequent operations involving the feature

Design change

Modifying Profiles ...


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Edit the sketchcorresponding to the

feature to bemodified

1

Modify the profile or dimensions2

Update the Part3

Alter the existing coordinates of theline to new parameters (V: 50mm)

2Double click line to editits coordinates

1

Modifying Profile Element Coordinates


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H: -40V: 50

This method works on most constructionentities, opening the appropriate dialogfor the entity selected

The profile stretches based on where you movethe element and the constraints you have applied

2

Click and drag the linedownward to its new location

1

Editing Profile Shape and Size


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You have modified the shape ofthe profile without the use of anyintermediary menu options

Select the element to be deleted1

Deleting Sketcher Elements


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Select Edit->Delete and the element iserased. Now multi-select additionalelements to delete

2

Use the contextual menu (selectMouse Button 3 while cursor is onone of the selected elements) todelete

3 You get:

To delete a set of 2D elements, multi-select the elements youwish to delete using the click and drag method. Then go to theEdit menu and select delete

Deleting elements



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Copyright DASSAULT SYSTEMES 2002 154Multi-selection

You w i l l learn how to reorder features m aking up a 3D par t

Reordering Features


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Pad moved before mirrorPad after mirror operation

Reorder allows you to correct a part so that your design intentis preserved

Why to Reorder Features ?


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One cylinder

Changes and features created later in the process can easily beincorporated into the part structure taking into account thedesign intent

Design change

Two cylinders whenmoved before mirror

Reordering Features ...


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SelectReorder from

the featurecontextual

menu

1

Select the feature after whichthe hole will be placed

2

Update the Part3

Right click the feature to bereordered to get a contextual menu

1

Pad.2 was incorrectly createdafter the mirror operation, so wemust reorder the pad before themirror

Select Reorder2

Reordering Features


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Select Pad.1 in thespecification tree as thefeature to reorder after(Pad.1 is shown as thepreview)

3

You get:


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Often, as a design matures, the initial configuration of a part needs refinementthrough the modification of feature parameters or the addition/removal of features

Why Modify Features ?


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Modified pad

Draft angle

Pad length

Modifying Features ...


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Double click on thefeature to be modified

1

Modify the feature dimensions2

Update the Part3

Modify the draftspecifications by

double clicking thedimension orentering in thed l b

2

Double click the feature or itsspecification to edit the feature

1

Redefining Feature Parameters


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dialog box

Next, modify Pad.1 of the part by rightclicking the feature in the specificationtree and selecting Definition...

3then modify thedimension directly orthrough its dialog box

You get:

Double click feature or itsspecification in the tree to edit hole

1

Change the hole definition in thedialog box or double click ondimensions to modify directly

2

Editing Holes


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Modify positiondimensions by doubleclicking them to modifydirectly

You get:

1 Double click on the pad to bemodified

3 Modify the constraint

(1)

4 Leave the sketcher byselecting the Exit icon

(4)

Sketch Edition During Pad Edition


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2 Select the sketch icon from the dialogbox in order to activate the sketcher

(2)

5 If necessary, select theUpdate All icon

You get :

(3)

(5)

1 Double click on the pad to bemodified

3 Select the replacing sketch

(1)

4 Select OK

(3)

(4)

Replacing Sketch During Pad Edition


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2 Select the sketch field from the dialogbox

(2) You get :

5 If necessary, select the UpdateAll icon

(5)


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part design fundamentals

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