Playing with Sheet Metal in Autodesk®...
Transcript of Playing with Sheet Metal in Autodesk®...
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Playing with Sheet Metal in
Autodesk® Inventor®
Kevin Burrows Technical Specialist – ECAD, Inc.
Lab Assistant: Jason Dupree – MFG Application Engineer – ECAD, Inc
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Objectives
Describe the difference between sheet metal parts and
regular parts
Set up sheet metal styles
Create a sheet metal template file
Use basic sheet metal commands (face, flange, hem)
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Goal for the Course
Images courtesy of ShopNotes®
Use Inventor’s sheet metal tools to create a
(dramatic pause)
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Part 1:
Background info,
Rules, and
Templates
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Definition Time!
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What is a Sheet Metal Part?
Uniform thickness ← KEY FACTOR
Usually less than ½” thick
Uniform material ← No Multi-body sheet metal parts
“It’s like metal origami.”
--Kevin Burrows
AKA the putz teaching this class
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Part Creation Process: Real World
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Part Creation Process: CAD World
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Part Creation Process: CAD World Calculating Flat Patterns: k Factor
k Factor – the ratio of the
neutral axis location
(measured from the inside
face) to the material
thickness.
k = 𝑡
𝑀𝑇
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Calculating Flat Patterns: k Factor
k factor is one way to tell Inventor how to calculate a flat pattern:
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We will use Outside Dimensions (OD) when measuring
folded models in this class.
Now, back to the
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Bend Allowance Setback
How Inventor applies k factor:
𝐷 =𝜋𝐴 𝑅 + 𝑘 ∗ 𝑀𝑇
180− 2(𝑀𝑇 + 𝑅)
Definitions
D = amount deducted at each bend (bend compensation)
A = bend angle in degrees
R = inside bend radius
k = k factor
MT = Material Thickness
Calculating Flat Patterns: k Factor
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Now we know how Inventor goes from
to
Calculating Flat Patterns: k Factor
… but how do we figure out a k factor that
works with our particular tooling?
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Solving for k, we get:
𝑘 =180(𝐷 + 2 𝑀𝑇 + 𝑅 )
𝑀𝑇𝜋𝐴−
𝑅
𝑀𝑇
Definitions
D = amount deducted at each bend (bend compensation)
A = bend angle in degrees
R = inside bend radius
k = k factor
MT = Material Thickness
Calculating Flat Patterns: k Factor
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Take a piece of scrap of
known length
Bend it
Measure the result
To find D, subtract the
total bent length from the
original length
Solve for k using the
previous equation
Calculating Flat Patterns: k Factor
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Calculating Flat Patterns: Bend Tables
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Demonstration:
Creating Unfold
Rules
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1. Start a new sheet metal part
based on Sheet Metal (in).ipt
2. Click on Sheet Metal Defaults
3. Click the pencil icon to edit the
unfold rules
4. Create a new unfold rule called
.40 k Factor
5. Change the k factor to .40 ul and
save it
6. Create a new unfold rule called
BendTable using these settings
Practice: Creating Unfold Rules
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Sheet Metal
Rules!
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Sheet Metal Rules: Screens
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Sheet Metal Rules: Screens
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Sheet Metal Rules: Screens
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Creating a Template: Where are
templates stored?
See your friendly
neighborhood
Application Options!
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Demonstration:
Creating a Sheet
Metal Rule
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Sheet tab Material: Steel, Mild
Thickness: 0.0747 in
Unfold Rule: .40 k Factor
Bend tab Relief Shape: Tear
Bend Radius: .03125 in
Bend transition: Straight Line
Corner tab 2 Bend Intersection: Tear
3 Bend Intersection:
Intersection
Practice: Creating a Sheet Metal Rule
1. Continue working in your
file
2. Click on Sheet Metal
Defaults
3. Click the pencil icon next
to the Sheet Metal rules
drop-down list
4. Create a 14 Ga Steel rule
based on the Default rule.
Settings
5. Save As->Template, then
close the file
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Part 2: Basic
Sheet Metal
Features
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Faces and Flanges
Face
Flange
Flange
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Faces and Flanges
Face
Flange
Flanges
Flanges
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Demonstration:
The
Episode 1
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1. Start a new part based
on the template you
created
2. Create a 2D Sketch on
XZ Plane
3. Draw a Rectangle
4. Create Face
5. Flange the 2 short
edges
Practice: The Shelf Part 1
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Hems
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Demonstration:
The
Episode 2
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1. Flange the 3 back
edges
2. Flange the front edge
3. Hem the front edge
4. Add corner chamfers
Practice: The Shelf Part 2
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Sheet metal parts in Inventor must have uniform _____
& _______.
What must you do before creating a flange feature?
What is the difference between the sheet metal part
creation process in the real world and the CAD world?
What is k factor?
Review Questions
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Objectives
Describe the difference between sheet metal parts and
regular parts
Set up sheet metal styles
Create a sheet metal template file
Use basic sheet metal commands (face, flange, hem)
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