Autodesk Inventor Sheet Metal moves away from standard solid modeling and into the world of "unfolding" geometry. In sheet metal design, you must account for material thickness, bend radii, and the physical reality of how a flat sheet of metal stretches when folded.

Day 1: The Sheet Metal Environment & Rules

Day one is about setting the "DNA" of the metal. In Inventor, you don't just draw a box; you define the material behavior first.

• Sheet Metal Defaults: Setting the Material (Steel, Aluminum, Copper) and Thickness.

• The K-Factor: Understanding the mathematical ratio that determines how much the metal "stretches" during a bend.

  • L = A + B + BA

    (Where BA is the Bend Allowance).

• Primary Features:

  • Face: Creating the base plate.

  • Flange: Adding walls at specific angles and distances.

  • Contour Flange: Creating complex "extruded" sheet profiles in one step.

• Corner Reliefs: Choosing between "Round," "Tear," or "Square" reliefs so the metal doesn't crack at the corners during fabrication.

Day 2: Advanced Manipulation & Enclosures

Day two focuses on complex shapes that go beyond simple 90-degree folds.

• Hems & Folds: Creating safety edges (hems) and custom fold lines for manual bending.

• Lofted Flanges: Transitioning from one shape to another (e.g., a square base to a round top), essential for HVAC ducting and hoppers.

• Rip & Unfold/Refold: Learning how to "rip" a solid corner to make it flattenable, and using the "Unfold" tool to add features (like holes) across a bend before "Refolding" it.

• Punch Tool & Library: Using the standard library for louvers, dimples, and electrical knockouts.

Day 3: Flat Patterns & Manufacturing Output

The final day is about getting the design out of the computer and onto the CNC Laser or Waterjet cutter.

• The Flat Pattern: Generating the 2D "unfolded" view. This is the most critical step for the shop floor.

• A-Side vs. B-Side: Defining which side of the sheet faces "up" during the cutting and folding process.

• Documentation:

  • Bend Tables: Automatically generating a table that tells the operator the bend angle, direction (up/down), and radius.

  • Bend Centerlines: Exporting the precise lines where the press brake tool will strike.

• Exporting for Production: Converting the flat pattern to a .DXF or .DWG file for CNC programming.

• Multi-Body Sheet Metal: Designing complex assemblies (like a server rack) where multiple sheet metal parts interact.