How to Calculate Bend Allowance

适用场景

Use this guide for first-pass flat layouts before verifying against tooling-specific tables and springback studies.

要使用的工具

Browser-based preliminary check for Bend Allowance Calculator — fast estimates, not code or stamped design output.

打开 Bend Allowance Calculator →

步骤

  1. 1Record material thickness, bend radius, and bend angle.
  2. 2Choose a k-factor or neutral-axis fraction consistent with process and material.
  3. 3Compute bend allowance and add to straight segments for developed length.
  4. 4Compare with CAD unfold and shop trial pieces when tolerance is tight.
  5. 5Iterate springback compensation based on empirical bends for production.

示例

  • Brake press layout for cabinet panels.
  • Prototype sheet-metal bracket before laser cutting.

应避免

  • Using generic k-factor for high-strength alloys without validation.
  • Ignoring grain direction effects on cracking and springback.
  • Confusing inside radius with tooling radius without offset.

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常见问题

Air bending vs coining?

Effective radius and k-factor change; document process assumptions.

Multi-step bends?

Sequence matters; stack tolerances through the bend order.

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