Bending Force Formula For Sheet Metal

Punch edge radius in.

Bending force formula for sheet metal. New bending force calculation method. Advantages of bottoming include greater accuracy and less springback. Calculate the ratio of the tensile strength of your material to the standard steel. Air bend force chart a chart used to calculate the tonnage required for a bend based on thickness tooling and length.

Get to know them better to learn advance concept easily. 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. Where ossb is the outside setback. Round up to the nearest v opening on the chart to match to your tooling.

Calculate your desired v opening based on the thickness of the sheet metal you re bending. The die ratio may be entered to calculate the die opening which is typically 6 to 18 times the sheet thickness. The size of that force is considered to be 5 to 10 times the free bending force. The following bending force calculator should be used.

The bending force can be calculated from the sheet thickness die opening bend length and the ultimate tensile strength of the material. 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. The bending force calculation formula obtained here is very consistent with the data on foreign brochures. Ultimate tensile strength psi.

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. Die edge radius in. 1 bending force for v bending see fig. The bending radius must be at least 0 8 t to 2 t for sheet steel.

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

Where a is the bending angle t is the sheet thickness and r is the bending radius. The tensile strength of ordinary materials σb 450n mm2 which can be substituted into formula 2 to obtain. Please check the new method for calculating the bending force of a press brake machine.