Bend Allowance For Aluminum Sheet

The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal.

Bend allowance for aluminum sheet. Most sheet metal materials will conform to the calculations. The bend allowance region is shown in green in my diagram this is a region wherein theory all deformation occurs during the bending process. Example flat size 2 2 095 3 905 bend radius 22 ga. The most important considerations when bending metal is the min.

Radius of a bend is determined by the hardness and thickness of the metal. Radius metal will crack at the outside heel of the bend. Sheet metal calculator bend allowance equations and calculator. Ba bend allowance.

Aluminum is typically thicker and stronger and requires more force to bend as well as consideration of edge conditions and punch nose radii. Figure 3 bend allowance also known as bend deduction can. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.

Figure 2 bend allowance also known as bend deduction can be used to predict the initial flat length of the sheet. Therefore the bend allowance added to the flange lengths is equal to the total flat length. Lf l1 l2 ba. The material thickness will be measured in decimal form not by the gauge number.

V die width is 6 8 times the plate thickness none 90 bend 180 angle 90 deduction the deduction is 1 8 times the steel plate thickness and 1 6 times the aluminum plate. The total length of the flatten sheet is equal to the sum of l1 that s the first length and l2 plus the bend allowance. The fine art of sheet metal bending complete design service 2002. Bend allowance is the amount of metal to be added to the total layout.

Figure 1 in air bending a sheet is placed in the die and the press ram descends and bends the sheet into a v shape. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. When bends are made smaller than the required min. Bend allowance mild sheet steel 90 degree bend allowance.

This free chart outlines what bend radii is required for the approximate thickness of aluminum. Preferred recommended 90 degree bend radii for various sheet metals. None 90 bend unfold according to the neutral layer the distance from neutral to sheet inner side is t 3 inner r can refer to the above chart. We recommend printing it out to keep as a reference.

When working with aluminum over sheet metal several variables need to be considered. 032 18 ga 040 16 ga. 10 carbon content may be bent back on itself in any direction without cracking.