2 Chapter 10 - ObjectivesAfter completing this chapter, you will be able to perform the following:Start the Autodesk Inventor sheet metal environmentModify settings for sheet metal designCreate sheet metal partsModify sheet metal parts to match design requirementsCreate sheet metal flat patternsCreate drawing views of sheet metal parts
3 Sheet Metal Fabrication Sheet Metal ExamplesEnclosuresBracketsStructures or Frames
4 Sheet Metal Fabrication Bend TablesL=A+B-x ConstructionL Unfolded LengthA Length of folded face 1B Length of folded face 2x Adjustment from bend tableMeasurements A and B are to the intersection of the extended outer faces on either side of the bend. This intersection is used when the angle of the bend is less than or equal to 90 degrees.
5 Sheet Metal Fabrication Bend TablesL=A+B-x ConstructionL Unfolded LengthA Length of folded face 1B Length of folded face 2x Adjustment from bend tableUse these measurements when the bend angle is greater than 90 degrees. The measurements are parallel to the face, and tangent to the outer surface of the bend. The same formula is used to determine the unfolded length of the part.
6 Sheet Metal Parts Sheet Metal Design Methods Folded State Flat State Disjointed SolidsShelled Parts
7 Sheet Metal Parts Sheet Metal Part Template(s) Convert part to Sheet Metal partModel tabor Environment tabOnce you convert a part to sheet metal, you can’t change it back.
8 Sheet Metal Tools Sheet Metal Rules Click the Sheet Metal tab > Setup panelSheet metal specific parameters driven by rulesThis should discuss the Sheet tab.Multiple K-factors and bend tables can be added to a style. One is the default method, but the others can be used on a per feature basis.
9 Sheet Metal Tools Sheet Metal Styles Bend Tab Technical Note The ends of the bend are perpendicular to the bend centerline. The bend terminates at the first edge. Also bend and corner related parameters are default and most of them can be changed on a per feature basis.
10 Sheet Metal Tools Sheet Metal Styles Bend Transitions Controls the intersection of edges across a bend in the flattened sheet.Technical NoteThe ends of the bend are perpendicular to the bend centerline. The bend terminates at the first edge. Also bend and corner related parameters are default and most of them can be changed on a per feature basis.
11 Sheet Metal Tools Sheet Metal Styles Corner Tab Relief Shape Jacobi Corner
12 Sheet Metal Tools Sheet Metal Unfold Method Linear – KFactor Value Bend Table
13 Custom Equation Method Additional control to unfold modelBend CompensationBend AllowanceBend DeductionKFactor
14 Sheet Metal Tools Sheet Metal Defaults After you define sheet metal rulesUse the Sheet Metal Defaults tool to select the rule that is active for the sheet metal part
15 Sheet Metal Tools Sheet Metal Face Extrudes a closed profile a distance equal to the sheet metal thicknessUnfold OptionsRelief Options
16 Sheet Metal Tools Contour Flange Created from an open sketch profile Bends are added at sharp intersections
17 Sheet Metal Tools Flange Creates a sheet metal face and bend to an existing faceExtends the full length of the selected edgeCorner Edits – click glyph in cornerTechnical NoteThe standard flange construction technique is to create the flange such that the virtual intersection of the flange and the face is located at the selected edge. This method is used primarily when designing in the context of an assembly. If you are working directly in the part file, the Bend Tangent to Side Face button (located under the Bend Radius field) creates the flange such that the bend is tangent to the edge of the sheet metal face.Flange extends the full length of the selected edge, if not other options are selected at the “>>”. This is also valid for the features “Contour Flange” and “Hem”The “Bend Tangent to Side Face” button is important and useful, if the bend angle is greater than 90 degree
19 Contour Roll Create from an open sketch profile No radius required between sketch linesFirst or secondary featureUnfoldedFlat pattern
20 Lofted Flange Create transitions from one shape to another Two sketchesOutputDie formPress break
21 Rip Open a closed sheet metal part Rip options One sketch point Two sketch pointsEnd pointsWork pointMidpoint of an edge
22 Exercise 10-2Lofted Flanges, Contour Roll, and Rips
23 Sheet Metal Tools Hem Eliminate sharp edges Strengthen an open edge of a faceMaterial is folded back over a face with a small gapA gap is required because the kernel will merge faces that touch. A convenient way to specify a small gap is to create a User Parameter “o” and make it equal to a very small number (e.g., )
31 Sheet Metal Tools Corner Seam Created when three faces meet Create mitered gaps between coplanar faces
32 Sheet Metal Tools Corner Round Corner Chamfer Sheet Metal specific Fillet toolCorner Chamfer– Sheet Metal specific Chamfer toolThese tools filter for sheet metal edges, which makes it easier to pick them.
33 Sheet Metal Tools Create Punch iFeature Center Point Parameters Punch IDCustom DepthSimplified Sketch
34 Sheet Metal Tools Punch Tool Center Point required Creates Cuts and 3D DeformationsDimplesLouversSet Punch FolderApplications Options > iFeature tabFlat PatternRepresentation
36 Sheet Metal Tools Flat Pattern Represents the starting point for sheet metal part manufacturingCreates a 3D model of the unfolded partDisplayed in a 2D drawing viewFlat Pattern – BrowserFlat Pattern – Extents, areaTechnical NoteThe flat pattern analyzer assumes that cuts go straight through the part. Features like chamfers and embosses will not appear correctly in the flat unless they are placed as iFeatures.
37 Sheet Metal Tools Flat Pattern Extents, area Edit Definition Punch RepresentationFlat Patten FeaturesEffect Flat Pattern OnlyTechnical NoteThe flat pattern analyzer assumes that cuts go straight through the part. Features like chamfers and embosses will not appear correctly in the flat unless they are placed as iFeatures.
38 Sheet Metal Tools Common Tools – Sheet Metal tab Holes Work Features Feature PatternsMirrorParametersTechnical NoteIdentical to the part environment.The part modeling tools can be used to create sheet metal features. For example, a tube can be constructed by extruding a hollow cylinder and cutting a slot.
39 Detailing Sheet Metal Designs 3D Model and Flat Patterns
42 Checking Your SkillsThe base feature of a sheet metal part is most often a:RevolveFaceExtrudeFlangeWhat is the correct procedure to change the edges connected by a bend feature?Suppress the existing bend, and add a new bend.Delete the existing bend, and add a new bend.Edit the bend, and select the new edges.Create a corner seam between the desired faces.Which command would you use to create a full-length rectangular face off of an existing face edge?BendWhat action is required to update a flat pattern model?Right-click on the flat pattern in the browser, and select Update.Erase the existing flat pattern, and recreate it.Create a new flat pattern drawing view.The flat pattern is updated automatically.Continued….
43 Checking Your Skills - continued True__ False__ Sheet metal parts can contain features created with Autodesk Inventor modeling tools.True__ False__ Sheet Metal Style settings cannot be overridden; a new style must be created for different settings.True__ False__ During the creation of a sheet metal face, the face can extend to meet another face and connect to it with a bend.True__ False__ A sheet metal cut that used the Distance extents option must be created equal to the Thickness parameter.What is a common term for a three-bend intersection?True__ False__ When creating a sheet metal punch, you can select an alternate 2D representation to display in flat patterns and drawing views.