Sheet Metal Minimum Bend Radius Formula

Ossb is defined as illustrated in figure 5 for different bending angles and can be calculated using the equation below.

Sheet metal minimum bend radius formula.

If you are working with a material thickness of 0 100 in multiply that by 0 63 to get a minimum inside bend radius of 0 063 in. An air bend force chart or force chart breaks down a number of key components of sheet metal bending in an easy to reference format. Leg length of the workpiece from the edge to the outside tangent point of the bend radius. Bend radii minimum bend sizes.

5 edge distortion an exaggerated example of edge deformation is pictured in figure a below. We recommend a minimum bend radius of 1t for all sheet metal parts. As explained in my first post the bend deduction can be calculated using the following equation. It shall be equal to three times of sheet thickness plus bend radius.

Kink a light bend typically between 5 and 15 which is used to stiffen a flat piece of metal. Where a is the bending angle t is the sheet thickness and r is the bending radius. Use this document to choose values that are both manufacturable and meet your needs. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.

D 2 5t r see below the height can be less but it required secondary operations and is far more costly. The radius is produced as a percentage of the die opening regardless of the die style. For example if the thickness of the sheet is 1 mm the minimum bend radius should be 1 mm. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.

Thus the smallest radius of any bend in a sheet should be at least equal to the thickness of the sheet. Below is xometry s minimum bend radius reference table which is based on. For this material this is the minimum producible inside radius with air forming. Where ossb is the outside setback.

Being able to read a bend force chart is crucial for any brake press operator and sheet metal engineer. Minimum sheet metal flange bend length 3 x sheet thickness bend radius minimum hole diameter guidelines. The gauge inside radius die opening and minimum flange length are all interconnected through different equations and relationships the air bend force. Large radius bending also known as r bending large radius bending is when the inside radius is greater than 8 times the material thickness.

Form height to thickness ratio to determine the minimum form height for sheet metal use the following formula. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. For example in the case of 1 0mm plate to the edge distance 1 5 then the minimum z bending h 6 1 2 1 5 1 8 1 2 1 6 4.