Bending Force Formula For Sheet Metal

The die ratio may be entered to calculate the die opening which is typically 6 to 18 times the sheet thickness.

Bending force formula for sheet metal.

The bending force can be calculated from the sheet thickness die opening bend length and the ultimate tensile strength of the material. An extremely large force is required in bottom bending depending on the amount of bottoming. Where a is the bending angle t is the sheet thickness and r is the bending radius. 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. Air bend force chart a chart used to calculate the tonnage required for a bend based on thickness tooling and length. The size of that force is considered to be 5 to 10 times the free bending force. 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. Get to know them better to learn advance concept easily. The bending force calculation formula obtained here is very consistent with the data on foreign brochures. 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.

Advantages of bottoming include greater accuracy and less springback. Punch edge radius in. As explained in my first post the bend deduction can be calculated using the following equation. Die edge radius in.

New bending force calculation method. The bending radius must be at least 0 8 t to 2 t for sheet steel. 3 carbon 45 kg mm. The following bending force calculator should be used.

1 the bending force for v bending is obtained using the following equation. 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. Air bending one of the three types of bending for sheet metal where the outside mold line is not pressed against the die. Calculate the ratio of the tensile strength of your material to the standard steel.

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