How to calculate the bending angle and the number of circular bending knives in sheet metal processing?

In Sheet Metal Processing, it is often necessary to calculate a series of numerical control angles and radians of the bending machine in bending, and it is also necessary to calculate accurately, otherwise the workpiece will have defects. Sheet metal bending, in simple terms, is to pass the metal sheet through pressure equipment and some special molds, and the flat sheet becomes three-dimensional. This processing process is called sheet metal bending. Due to the different materials, thicknesses, lengths and widths of the plates, the corresponding molds and bending machine equipment are also different.

Let‘s follow the small edition of the sheet metal processing manufacturer to see how to calculate it?

The unfolding length of the arc, Wuxi Shenchong believes that the length is calculated according to the data, and the arc length is calculated according to the length of the neutral layer. It cannot be calculated according to the arc length of the outer or inner mouth, and the size will be inaccurate. The neutral layer is the length of the layer that is neither elongated nor compressed during the bending process of the sheet metal in theory.

As the unfolded length, how to use the neutral layer? Sheet metal bends a large circular arc. When the fillet R divided by the sheet metal thickness is equal to 6.5 times, the neutral layer is in the center of the sheet metal thickness. So, the sheet metal arc length calculation in the figure below is equal to: 3.14 (20 + 0.5)/2 = 32.2, where: 20 is the bending radius and 0.5 is 1/2 the sheet metal thickness. Why divide by 2? Because the calculation is the radius, which is equal to the circumference of half a circle, we bend 90 degrees, which is equal to the circumference of 1/4 circle. Other angle calculation formulas can be divided by 180 first and multiplied by the bending angle.

Calculate the number of bending knives. If you know the length of the bending arc, you can calculate the number of knives. Generally, we can calculate 32.2/2 = 16 according to the positioning of each bending movement of 2 mm, and the decimals are rounded.

Calculate the bending angle, knowing that the bending angle to be completed is 90 degrees, and the number of bending knives is 16 times. It can be calculated that each bending angle is equal to: 90/16 = 5.63 degrees. Then subtract 5.63 degrees from 180 degrees, and the setting angle of the bending machine is: 180-5.63 = 174.37 degrees. The number of bending knives above is calculated according to the experience value. If you feel that each 2 mm bending effect is not good, you can modify it appropriately.