Sheet Bend Allowance
Compute flat length L from legs A/B, bend angle α, inner radius R, thickness T and K-factor.
Inputs
Formula
Fundamentals
Compute flat length L from legs A/B, bend angle α, inner radius R, thickness T and K-factor.
This tool computes Sheet Bend Allowance from the formula: BA = (π/180)·α·(R+K·T); L = A+B+BA
History
Manufacturing evolved with machine tools and CNC; cutting-parameter calculation is central to process planning.
Engineering applications
Used for cutting parameters, tooling and forming process design.
Glossary
| Leg A | Input parameter |
| Leg B | Input parameter |
| Bend angle α | Input parameter |
| Bend allowance BA | Output result |
| Flat length L | Output result |
How to use
- Fill in Leg A, Leg B, Bend angle α, Inner radius R, K-factor K, Thickness T in the Inputs section (watch the unit on each field).
- Click Calculate; the tool evaluates the formula shown above.
- Read Bend allowance BA, Flat length L in the results area.
Formula · Worked Example · Knowledge
Formula
核心计算关系：BA = (π/180)·α·(R+K·T); L = A+B+BA
输入变量：
- Leg A
A— mm - Leg B
B— mm - Bend angle α
alpha— ° - Inner radius R
R— mm - K-factor K
K - Thickness T
T— mm
输出结果：
- Bend allowance BA
BA— mm - Flat length L
L— mm
假设/适用：Cutting params (v, f, a_p) must stay within tool/workpiece recommended windows.
Worked Example
根据公式 BA = (π/180)·α·(R+K·T); L = A+B+BA，取 Leg A = 50 mm；Leg B = 50 mm；Bend angle α = 90 °；Inner radius R = 5 mm；K-factor K = 0.33；Thickness T = 2 mm。
代入计算得：Bend allowance BA = 8.891 mm；Flat length L = 108.9 mm。
Key Points
- Cutting params (v, f, a_p) must stay within tool/workpiece recommended windows.
- MRR scales with feed speed, depth and width; sets required spindle power.
- Feed f = f_z·z·n; match per-tooth feed with spindle speed.
Parameters
Inputs
| Parameter | Symbol | Unit | Default |
|---|---|---|---|
| Leg A (mm) | A | mm | 50 |
| Leg B (mm) | B | mm | 50 |
| Bend angle α (°) | alpha | ° | 90 |
| Inner radius R (mm) | R | mm | 5 |
| K-factor K | K | 0.33 | |
| Thickness T (mm) | T | mm | 2 |
Outputs
| Result | Symbol | Unit |
|---|---|---|
| Bend allowance BA | BA | mm |
| Flat length L | L | mm |
Applications
- Cutting parameters and speed
- Gear measurement (3-wire/base tangent)
- Blanking and deep-drawing process