Transcript
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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
• Circular 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
• Circular Patterns
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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