Sheet Metal Bending Force Calculator

Sheet Metal Bending Force Instructions

Bending force is one of the most critical parameters in sheet metal forming. Selecting the correct die width and punch radius is essential for maintaining process reliability and protecting equipment.

1. V-Bending: Free Bending vs. Bottoming

• Free Bending: The sheet contacts only the upper punch tip and the two edges of the lower V-die. The bend angle is controlled by stroke depth. This requires less force but results in larger springback.
• Bottoming (Restricted Bending): The sheet is pressed tightly against the bottom of the V-groove at the end of the stroke. This produces higher precision and smaller springback, but the required force increases by 3 to 4 times.

2. U-Bending Calculations

U-bending requires forming two parallel flanges simultaneously, which means overcoming friction and double bending resistance. Our calculator adds a 30% counter-pressure coefficient to align with standard stamping die design requirements.