ML301-1P_AdvancedSheetMetal

8/4/2019 ML301-1P_AdvancedSheetMetal

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Advanced Sheet Metal Modeling

Techniques in Autodesk Inventor

Seth A. HindmanManufacturing Industry Group


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About todays class

The content we will cover

What does advanced really mean?

Presentation vs. manuscript

Questions and answers


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Key Items

The mechanics of unfolding

Modeling sheet metal with standard features

Punches and iFeatures


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The Mechanics of Unfolding


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The Unfolders Topological Inputs

Angle, radius and thickness

Measurements are taken from consistent perspective

No native feature requirement

Cylinders and cones


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Inventors Unfold Methods

Linear KFactor Based

Bend Table Experimentally Based


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Equations of Unfolding

Linear Method Bend Allowance

1 2

180

Total BA

BA Factor

Factor

L L L L

L K

K

FT V Q

W

Q

!

! r

!


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Bend Tables Bend Deduction

Equations of Unfolding

Mold line measurement example

for bending angles less than 90

Mold line measurement example for

bending angles equal to or larger than 90

1 2TotalH!


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Common Barriers to Unfolding

(a) Non-Manifold Geometry (b) Non-Uniform Thickness (c) Non-Cylindrical/Conical Bend

(d) Bad Geometry (e) Merged Bend Zones


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Surfaces as the Basisof Your Design


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Lines and Arcs

Reduce the chance of creating splines

Only cylinders and cones can be unfolded

Lines and arcs can emulate spline definition

vs.


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Can I Use the Loft Command?

Inherently produces doubly curved surfaces

Surface vs. solid output

Does you loft need to unfold?


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Cladding Workflows

Generalized designp nuanced sheet metal version

Fillet and shell or leverage work surface

Combine surface references with sheet metal features


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Surfaces as Cutting Tools


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Swept Faces and Face Splitting

Extrude, revolve and sweep for surface creation

Surface utilized as dynamic split reference

Need to ensure sheet metal conditions

Surfacep Splitp Thicken


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Tackling Complicated Problems

Closed profiles reduce available tools

Sheet metal conditions are still required

3D sketches and swept surfaces



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Assembly Context Cutting

Intersections and fits are common

Sheet metal conditions are challenging to apply

Leverage copy object to produce surface



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Standard Feature Pitfalls


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Shelling Solids

Shelling is not always uniform

Sheet metal conditions are not ensured

Shelled Sheet Metal Conditions


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The Good, the Bad and the Ugly

Extrude, revolve, sweep & thicken

Bend part & boundary patch

Loft & shell


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Punches: Friend or Foe?


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Alternatives to Work Geometry in Punches

References facilitate intuitive design, but cause challenges

A progression of features can provide similar platform


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Constructing Successful Punches

Include a single sketch point for placement

Dont reference work geometry!

Use sketch references instead of faces or edges

Create detailed sketch profiles to limit features


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ParameterConsumption in Punches


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Punches Alternate

Representations


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Choosing Whats Best for You

Formed Punch 2D Sketch

2D Sketch

[Symbol]

2D Sketch +

Center MarkCenter Mark Only


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Projected vs. Sketched Geometry

Are your representation needs geometric or symbolic?

Enables more punch family flexibility


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The Manufacturing Data

within Your Punch


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Orientations Effect Upon Your Data

Default punch information Flat pattern rotated

Based face flipped Member change


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Using Parameters to Drive Manufacturing Data


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The Punch AuthoringEnvironment


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Adding Manufacturing Data to Existing Punches


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Upgrade Your Punch to a Family of Punches


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Session Survey

Your feedback is valued!

100 survey stations in Hall B

Surveys take about 1 minute

Enter to win AU 2009 pass!


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Date post:	07-Apr-2018
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ML301-1P_AdvancedSheetMetal

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