For hard materials (CRCA and stainless steel), Minimum inside radius is 0.7 times of sheet thickness. For softer materials (for example Aluminium) minimum inside radius is equal to sheet thickness.
Minimum flange length shall be equal to 4 times of sheet thickness plus inside radius.
Minimum Flange length = 4 X T (sheet thickness) + R (Inside Bend Radius)
Minimum Distance = 3 X Sheet Thickness + R (Inside Bend Radius)
can be used as default tolerance.
After bending total length (Length + Height) of sheetmetal part is not equal to Flat Length. This increase in overall length is known as bending allowance.
Flat Length = Length + Height – Bend Deduction
You can use this calculator to calculate sheet metal bending allowance
K-Factor is a constant, used to calculate the Sheetmetal flat length. Value of k-factor depends on material, Bend radius, sheet thickness and machines used. Mathematically K-Factor is a ratio of position of neutral axis and sheet thickness.Value of K-factor is always less than 0.5
Y-factor is similar to K factor. It is used to calculate sheet metal parts flat length.
Following are commonly used sheet metal surface finish operations:
Reinforcement techniques improves part strength in localized section.
Press tools are used in hydraulic, pneumatic & mechanical presses to produce stamped sheet-metal parts. Press tools can be classified based on operation: blanking, piercing, bending and forming.
Stamping is a process of shaping sheet-metal parts using press tool. Blanking, punching, pressing, piercing, bending and forming operations are done with stamping dies.
Following techniques can be used to join sheetmetal parts.