Download Chapter 7

Chapter 7
Advanced Part Modeling
Techniques
Chapter 7 - Objectives
• After completing this chapter, you will be
able to perform the following:
– Extrude an open profile
– Create ribs, webs, and rib networks
– Emboss text and profiles
– Create sweep features
– Create coil features
– Create loft features
– Split a part or split faces of a part
– Bend a part
Chapter 7 - Objectives
• After completing this chapter, you will be
able to perform the following:
– Copy features within a part
– Reorder part features
– Mirror model features
– Suppress features of a part
– Create a derived part based on another part or
an assembly
– Shrinkwrap an assembly
– Create plastic and cast features
Using Open Profiles
• Using Open Profiles
– Sketch that does not
form a closed area
– Extrude tool only
– Extrude bi-directionally
• positive or negative
direction, fill direction
– Match Shape
Rib and Web Features
• Rib and Web Features
– Used to reinforce or strengthen
features
• Additional support and minimal
weight are required
– mold and cast parts
– Ribs, webs, and rib networks
– Single, open, unconsumed profile
– Taper
Rib and Web Features
• Rib and Web Features
– Rib dialog box
– Shape
• Profile
• Direction
– Thickness
• Edit Box
• Flip Buttons
– Extents
• To Next
• Finite
• Extend Profile
– Extend Profile
– Taper
Rib and Web Features
• Creating Rib and Web
• Rib Networks
– Use multiple intersecting or nonintersecting sketch
objects
– Thickness is applied to all objects
• Rib Network as a
– Profile
– Ribs
– Webs
Exercise 7-1
• Creating Ribs and Webs
Emboss Text and Closed Profiles
• Emboss Text / Closed profile
– Embossed (raised)
– Engraved (cut)
• Shape or Text
• Geometry Text
• On a plane or a curved face
– Step 1 - Creating Text
– Step 2 - Emboss Text
Exercise 7-2
• Creating Text and Emboss Features
Sweep Features
• Sweep Features
– Requires two unconsumed
sketches
– Sweep dialog box
•
•
•
•
Profile
Path
Operation buttons
Solid / Surface
• Taper
• Type
• Orientation
Sweep Features
• Profile
• Path
• Orientation
– Path
– Profile
Sweep Features
• Type - Path & Guide Rail
• Profile Scaling
–X&Y
–X
– None
Sweep Features
• Type - Path & Guide Surface
– Path
– Profile
– Guide Surface
Exercise 7-3
• Creating Sweep Features
3D Sketching
• Defining a 3D path
–
–
–
–
Lip or routing
Work points
Model edges/vertices
3D Sketch Environment
• 2D & 3D curves
Sweep Features
• 3D Sketching
– 3D Path From Existing Geometry
• Define path
– Use existing edges
• Include Existing Geometry
– Projecting part edges, vertices, and geometry
3D Sketching
• 3D Sketch From Intersection Geometry
– Defined by a combination
•
•
•
•
Planar or nonplanar part face
Surface face or quilt
Objects
Work plane
3D Sketching
• Project to Surface
–
–
–
–
Project Along Vector
Project to Closest Point
Wrap to Surface
Break Link
3D Sketching
• Constructed
Paths
– Connecting
• Work points
• 3D line
– Auto-Bend
• Radius
Sweep Features
• 3D Sketching
–
–
–
–
–
Work Points
Grounded Work Points
Constraints
3D Lines and Splines
Precise Input
Exercise 7-4
• 3D Sketch – Sweep Features
• Coil Features
Coil Features
• Helical, springs or coil shapes
–Coil Shape
•
•
•
•
•
Profile
Axis
Flip
Rotation
Operation
–Coil Size
•
•
•
•
•
Type
Pitch
Revolution
Height
Taper
Coil Features
• Coil Features
– Coil Ends
•
•
•
•
Start
End
Transition Angle
Flat Angle
– Using base & secondary feature
Loft Features
• Loft Features
– Blends a shape between two or more sections
– Area Loft
– Complex shapes
• Plastic or molded parts
– Sections
– Rails
– Center Line
– Points
– Curves
Loft Features
•Curves
–Sections
–Rails
–Center Line
–Output
–Operation
–Closed Loop
–Merge tangent
Faces
–Area
Loft Features
•Conditions
–Condition Boundaries
Sketches
• Free Condition
• Direction Condition
–Condition Boundaries
Face Loop
• Smooth (G2) Condition
–Angle
–Weight
Loft Features
• Loft Features
– Transition
• Point Set
• Map Point
• Position
Exercise 7-5
• Creating Loft Features
Multi-Body Parts
• Create a solid body in a part file
• Derive a solid body into a part file
• Split Part into solid bodies
Multi-Body Parts
• Edit solid bodies
– Move bodies
– Combine
Multi-Body Parts
• Export solid body
– Make Part
– Make Components
Split a Solid, Part or Face
• Part Split and Face Split
– Method
• Split Face
• Trim Part
– Remove Material
• Split Solid
– Split dialog box
•
•
•
•
Split Tool
Faces
All
Select
Exercise 7-6
• Splitting a Part
Bend Part
• Bend a part
– A bend line
– Radius + Angle
– Radius + Arc Length
– Arc Length = Angle
Copying Features
• Browser or Feature Priority
–
–
–
–
–
Dependent
Independent
Paste Features
Parameters
Pick Sketch Plane
Mirroring Features
• Mirroring Features
– Features
• Dependent on the parent
feature
• Mirror Plane
• Creation Method
• Change or update
– Mirror Entire Solid
Suppressing Features
• Suppressing Features
–
–
–
–
–
Temporarily turn off display
Simplify parts
Increases system performance
Unsuppress
Parent – child relationships
Conditionally Suppress Features
• Feature Properties
• Parameter Value – If statement
Reordering Features
• Reordering Features
– Browser
• Drag horizontal line
Feature Rollback
• Feature Rollback
–
–
–
–
Roll back the design to an earlier state
Then place new features
Reorder
Delete all features below EOP
Derived Parts
• In a Part (IPT) file
• Options
–
–
–
–
–
–
–
–
–
Body
Work Surface
Sketches
3D Sketches
Work geometry
Surfaces
Exported Parameters
iMates
Options
• Operations
– Mixed
– Plus
– Exclude
• Scales Factor
• Mirror Part
Derived Assemblies
• In a Part (IPT) file
• Operations
–
–
–
–
–
Combination
Plus
Exclude
Minus
Bounding Box
• Keeps seems between
planar faces
• Reduced Memory Mode
• Update
• Break Link
Exercise 7-7
• Creating a Derived Part
Shrinkwrap
• Reduce detail
– Protect intellectual property
– Reduce file size
• Create a substitute part for use with
alternative representations
• Create simplified data for complex
purchased assemblies
Shrinkwrap
• Remove detail by setting
– Visibility
– By Size
– Holes patching
– Object type
Exercise 7-8
• Shrinkwrap
Plastic and Cast Features
• Silhouette Curves—Parting Line
– Create a curve at the outermost boundary
of the selected faces
– Select a direction
– Then create a surface that will be used as
a split tool
Plastic and Cast Features
• Grills
– Create a grill feature from a simplified sketch
– Create a sketch
– Create feature - fill in information in dialog box
Plastic and Cast Features
• Bosses
– Creates a boss feature to hold a fastener
– Place sketch point(s) or work point(s)
– Create feature - fill in information in dialog box
Plastic and Cast Features
• Rests
– Create flat area the goes partially inside and
outside a part
– Create a sketch
– Create feature - fill in information in dialog box
Plastic and Cast Features
• Snap Fit
– Creates a mechanism that is used to hold two
parts together
– Place sketch point(s) or work point(s)
– Create feature - fill in information in dialog box
Plastic and Cast Features
• Rule Fillet
– Creates a fillet based on a set of rules that dictate
when edges touch certain faces or features, fillets
will automatically be created
– Rules
• All Edges, Against Part, Against Features or Free Edges
Plastic and Cast Features
• Lip
– Creates lips and grooves that join two parts
together at their parting lines
– Lips add material and grooves remove material
– Create feature - fill in information in dialog box
Exercise 7-9
• Plastic Part
Part Materials
• Part Materials
– Physical tab or Properties dialog box
– Mass is calculated from material
– Part color set to As Material
• Color equals As Material
Override Mass & Volume Properties
• Mass and volume values
– Default & Overridden
– Copy information into another application
Applying Your Skills
• Skill Exercise 7-1
Checking Your Skills
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
True_ False_ When creating a single rib or a web feature, you can only select a closed
profile.
True_ False_ Both the Extrude and Revolve command can use the minimum or
maximum extrusion solutions option.
True_ False_ You can only place embossed text on a planar face.
True_ False_ A sweep feature requires three unconsumed sketches.
True_ False_ You can create a 3D curve with a combination of both 2D and 3D curves.
Explain how to create a 3D path using geometry that intersects with a part.
True_ False_ The easiest way to create a helical feature is to manually create a 3D path
and then sweep a profile along this path.
True_ False_ You can control the twisting of profiles in a loft by defining point sets.
Explain how to split a part into two solid bodies and then save them to their own part file.
True _ False _ You can copy features between parts using the Copy Feature command
on the Modify panel.
Explain the difference between suppressing and deleting a feature.
True _ False _ After mirroring a feature, the mirrored feature is always independent
from the parent feature. If the parent feature changes, the mirrored feature will NOT
reflect this change.
True _ False _ A derived part cannot be scaled.
True _ False _ When creating a lip feature with the Lip command, you must first create a
3D path.
Explain why you would want to override a part’s mass and volume properties.