Bending Force Formula For Sheet Metal

Punch edge radius in.

Bending force formula for sheet metal.

Where a is the bending angle t is the sheet thickness and r is the bending radius. The bending force calculation formula obtained here is very consistent with the data on foreign brochures. 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. 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.

If the width to thickness ratio v s is not equal to 9 and the diameter to width ratio is not equal to 0 16 the above calculator will no longer be applicable. Get to know them better to learn advance concept easily. An extremely large force is required in bottom bending depending on the amount of bottoming. The size of that force is considered to be 5 to 10 times the free bending force.

Die edge radius in. The die ratio may be entered to calculate the die opening which is typically 6 to 18 times the sheet thickness. 1 the bending force for v bending is obtained using the following equation. Calculate the ratio of the tensile strength of your material to the standard steel.

Calculate your desired v opening based on the thickness of the sheet metal you re bending. Where ossb is the outside setback. Ossb is defined as illustrated in figure 5 for different bending angles and can be calculated using the equation below. Larger bend radii require about the same force for bottoming as they do for air bending however smaller radii require greater force up to five times as much than air bending.

Round up to the nearest v opening on the chart to match to your tooling. As explained in my first post the bend deduction can be calculated using the following equation. Air bending one of the three types of bending for sheet metal where the outside mold line is not pressed against the die. New bending force calculation method.

Advantages of bottoming include greater accuracy and less springback. Air bend force chart a chart used to calculate the tonnage required for a bend based on thickness tooling and length. Ultimate tensile strength psi. 3 carbon 45 kg mm.

Please check the new method for calculating the bending force of a press brake machine. 1 bending force for v bending see fig. The bending radius must be at least 0 8 t to 2 t for sheet steel.