Sheet Metal Forming - Bending

Sheet Metal Bending Results
The action of the bending in both tension and compression in the sheet metal. The outer surface of the plate will be tension and stretch in length, while the experience of compressed and reduced. Core boundary line of the sheet metal with no tension or force of compression present As a result, the length of the core remains constant. The changes in length to the outside and inside surfaces can be related to the original flat length by two parameters, the bend allowance and bend deduction

Sheet Metal Bending Result

- Neutral axis - The location in the sheet that is neither stretched nor compressed, and therefore remains at a constant length.

- K-factor - The location of the neutral axis in the material, calculated as the ratio of the distance of the neutral axis (measured from the inside bend surface) to the material thickness. The K-factor is dependent upon several factors (material, bending operation, bend angle, etc.) and is typically greater than 0.25, but cannot exceed 0.50.

- Bend allowance - The length of the neutral axis between the bend lines, or in other words, the arc length of the bend. The bend allowance added to the flange lengths is equal to the total flat length.

- Bend deduction - Also called the bend compensation, the amount a piece of material has been stretched by bending. The value equals the difference between the mold line lengths and the total flat length.

Sheet Metal Forming - Bending

Sheet Metal Forming - Bending
Bending metal forming processes are applied to a piece of sheet metal that makes it bend at the corner and forms the shape you want. The bending deformation along the a axis. But the order of execution can do different to create the complex The bend is very small, such as seizure or increased to 20 feet in length, such as a large cabinet or chassis. Bend can be characterized by several different parameters.

• Bend line - The straight line on the surface of the sheet, on either side of the bend, that defines the end of the level flange and the start of the bend.

Sheet Metal Forming Bending

• Outside mold line - The straight line where the outside surfaces of the two flanges would meet, were they to continue. This line defines the edge of a mold that would bound the bent sheet metal.

• Flange length - The length of either of the two flanges, extending from the edge of the sheet to the bend line.

• Mold line distance - The distance from either end of the sheet to the outside mold line.

• Setback - The distance from either bend line to the outside mold line. Also equal to the difference between the mold line distance and the flange length.

• Bend axis - The straight line that defines the center around which the sheet metal is bent.

• Bend length - The length of the bend, measured along the bend axis.

• Bend radius - The distance from the bend axis to the inside surface of the material, between the bend lines. Sometimes specified as the inside bend radius. The outside bend radius is equal to the inside bend radius plus the sheet thickness.

• Bend angle - The angle of the bend, measured between the bent flange and its original position, or as the included angle between perpendicular lines drawn from the bend lines.

• Bevel angle - The complimentary angle to the bend angle.