1 Modellazione PART

8/17/2019 1 Modellazione PART

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MODELLAZIONE PARTSimulazione e Prototipazione Virtuale


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Philosophy of CAD Lectures

• Demonstrate small fraction of available functionality

• ƒIdeally the most useful fraction…

• Accelerate your learning process

• ƒGet you up-to-speed as quickly as possible…

• Promote self-discovery

• ƒMotivate you to learn more on your own…

• Demonstrate use as a design tool

• Not (just) a detailing/documentation tool


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History of New CAD/CAM Functionality

• 1960’s - Design of complex surfaces,

programming of NC machine tools

• 1970’s - Automation of Drawings

• 1980’s – Solids• 1990’s - Parametric Feature-based Solids


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Key Concepts: “Parametric” & “Associativity”

• Parametric: Nel cad parametrico (Dimension Driver) ogni

operazione si esprime attraverso parametri ( formule,

numeri...) che rendono il lavoro modificabile con la

modifica dei parametri stessi.

• Associativity: Changes in dimensions propagate between

parts, drawings, assemblies


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PART Features

• Sketched

• 2D geometry (sketch) swept along a 3D path

• Applied

• Attached to existing geometry


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Sketched Feature Types

• Extrude• Constant cross-section

• along a straight line

• Revolve• Constant cross-section

• around an axis of revolution

• Sweep• Constant cross-section

• along a space curve

• Loft• Multiple cross-sections

• along a space curve


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Sketched Features

• May add or subtract material!


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Applied Features

• Attached to existing geometry

• e.g. edges, faces

• Types• Fillet

• Pattern

• Shell

• Draft

• Rib

}Injection-molded parts


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Fillet

• Add and remove material

Remove

Add


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Problems

• Feature tree


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EXTRUSION


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Extrusion

• Closed Profile on a

2D Plane

• Direction

• Amount

• First Extrusion• New 2D Planes

Created

• Add or Subtract

Finished Product


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Adding Material

Positive Extrusion

2D Profile used to add material at a

specified length

2D Profile extruded to next surface or

to selected surfaces


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Subtracting Material

Negative Extrusions

2D Profile used to subtract material

at a specified length

2D Profile used to cut to selected

surfaces or through all


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SolidWorks: Extrude Dialogue Box

Reverse Direction

Depth

Direction 2 (if needed)

A Blind Extrusion

is an Extrusion to a

selected depth

Extrusion Options

Extruded Cut is for

Negative

Extrusions and

contains many of

the same options


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SolidWorks: Base Extrusion

This profile is a nested profile

and thus the final result onlyadds material between the

outer and inner lines

A base feature can be

created by extruding a 2Dsketch located on one of

the original planes


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SolidWorks: Sketching on Surfaces

Once the first extrusion is

completed new faces are

available for sketching.

Click the sketch button then

select the 2D surface or

plane that is necessary forthe next step


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SolidWorks: Extruded Cut

The depth can be determined by a

numerical distance or other optionsfor Extruded Cuts including:

Through All and to Next Surface

Once the base feature is

created, a 2D sketch can

be drawn on one of the

faces of the new object


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SolidWorks: Feature Extrusions

If a profile overlaps theoriginal geometry then the

two extrusions will merge to

create one part

Extrusions can continue to

be added and the resultingprotrusion will be joined to

the original base


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SolidWorks: Editing Features

To edit any feature

right click on the

feature in the model

tree

The dialogue window

allows you to (from left to

right, top to bottom):

• Edit Feature

• Edit Sketch

• Suppress Feature

• Roll Back

• Hide

• Zoom to Feature

• Normal View to

Feature• Change appearance

(color)


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Extrusion Wrap Up

Extrusions• Positive Extrusion

• stretch a 2D profile to 3D• Negative Extrusion

• remove material from a 3D model

(cut)

• Geometries merge

• Loops have to be CLOSED

• Shape is important, dimensions

are not.


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REVOLVE


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Revolving

• 2D Profile

• Extents

• FullRotation

• Degree

• Axis of

Rotation:• Attached

– Closed

Solid

• Separated

– Solid

with Hole


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Revolve Vs. Extrude

• Revolve Complements

Extrusion• Some Objects Difficult to

Extrude

• i.e. Cones, wheels

• How would you create this

object with extrude?


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Positive Revolves Negative Revolves


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Acceptable Profiles


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Options in the Line tool can

be chosen to create aconstruction line that will be

used as a revolution axis

SolidWorks: Revolution Axis

Revolve 28


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Revolve 28

SolidWorks: Closed Profile

Example of a closed

profile aligned with thecenter axis (created by

using a construction line)

SolidWorks preview

allows the designer toselect the correct options


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SolidWorks: Hollow Profile

Example of a closed

profile separated from thecenter axis (created by

using a construction line)

This example shows how to

create a hollow revolve.This is helpful in the

creation of wheels, etc.


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Revolves Wrap Up

• Positive Revolve• Make a 3D object

• Negative Revolve• Remove material from a 3D object

• Attached Rotation• Will produce a closed object

• Separated Rotation• Will produce an object with a hole

• Use construction lines for axes

• Ensure validity of profile (entire sketchis on one side of revolution axis)


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ADVANCED MODELING

TECHNIQUES


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Advanced Modeling Techniques

• Methods to Save Time

• Reference Geometry

• Mirroring

• Linear Patterns

• Circular Patterns

• Methods to Create Shapes

• Holes

• Shelling

• Sweep

• Loft


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Reference Geometry: Planes

SolidWorks starts off with

the 3 original planes:front, right, top

To add a new plane we

can reference previous

planes and create offset

new planes or other

options


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Reference Geometry: Axes

Axes can also be

created without the

creation of a 2D

sketch


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Mirror

First the Mirror

Plane must be

chosen

Mirroring creates

an reverse copy of

features on the

opposite side of a

mirroring plane


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Mirror

Once the plane has beenchosen then the features to

mirror are selected

The new features are joined to the original model


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Linear Patterns

Features can also be

duplicated in linear patternsin either one or two

directions.

Once edges are selected for direction,

number of instances and distance are

specified in the dialog box


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Circular Patterns

Once features and

axes are chosen the

angle and number of

instances are

specified

Features can also be

duplicated in circularpatterns around an axis


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Advanced Modeling Techniques

• Methods to Save Time

• Reference Geometry

• Mirroring

• Linear Patterns


• Methods to Create Shapes

• Holes

• Shelling

• Sweep

• Loft


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Holes

• Mating Parts

• Hole

Specifications

• Built-in HoleTools

• Location and

Size Selected


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Shells

• Removes Volume

• Thin Wall Created


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Sweep

Pathways can becombined with a 2D

profile, such as a

circle, to create what

is known as a sweep

Mirror

complex

features to

save time


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Loft

Lofting is taking two

profiles on separated

planes and filling the

space between with

material that blendsthe original profiles

The same shape but different sizes

can be used


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Loft

Different shapes can be blended into one solid such as the

hexagon is connected to the circles of different sizes

Circular patterns,fillets, and

appearances can

also be added


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Advanced Concepts Wrap Up

Time Saving Methods

• Reference Geometry• Planes/Axes/Points

• Mirroring• Linear Patterns• One or two directions


Advanced Shapes

• Sweep• Loft

SolidWorks tutorials

• Lofts

• Pattern Features

• Revolves and Sweeps

Found under the Buidling Modelstab of the SolidWorks tutorials

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