Bending Force Formula For Sheet Metal

First let us calculate the v bending force.

Bending force formula for sheet metal.

Factor of safety 4. Bend line shift bls the distance from the outside mold line to the original bend line on the flat pattern this is used to calculate the backstop location when working off of a flat pattern. 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. Get to know them better to learn advance concept easily.

Bend length 3. The bending force calculation formula obtained here is very consistent with the data on foreign brochures. Where a is the bending angle t is the sheet thickness and r is the bending radius. R inner radius when the sheet is bent.

K the width of the horizontal projection of the bending deformation zone. Where ossb is the outside setback. The gauge inside radius die opening and minimum flange length are all interconnected through different equations and relationships the air bend force. Air bending one of the three types of bending for sheet metal where the outside mold line is not pressed against the die.

As explained in my first post the bend deduction can be calculated using the following equation. Die ratio 6. Sheet thickness 3. Substitute the given values in the formula bf safetyfactor kfactor ultimatestrength bendlength thickness 2 dieopening.

The bending force can be calculated from the sheet thickness die opening bend length and the ultimate tensile strength of the material. Ossb is defined as illustrated in figure 5 for different bending angles and can be calculated using the equation below. Calculate the required force to bend a piece of sheet metal using v bending a process in which a v shaped punch presses the sheet into a v die. My workpiece s bending line is 3 m so the overall needed force is 3 22 66 tonnes.

The required die width is 12 mm and tonnage per meter is 22. The die ratio may be entered to calculate the die opening which is typically 6 to 18 times the sheet thickness. Being able to read a bend force chart is crucial for any brake press operator and sheet metal engineer. The tensile strength of ordinary materials σb 450n mm2 which can be substituted into formula 2 to obtain.

Here end the fabrication formulas for sheet metal up next we ll be seeing some of the terminologies in sheet metal that you ll need.