The bending coefficient is related to the plate thickness, bending angle, bending radius, the upper and lower dies of the bending machine and the length of the bending parts.
We use empirical values.
After all, the conventional standard algorithm does not take into account equipment wear.
In case of insufficient plate material thickness, different plate thickness determines different bending coefficient.
For example, 1mm cold rolling sheet is folded by 90 degrees and 2mm cold rolling sheet is folded by 90 degrees. Our actual situation is that the coefficient of 1mm thickness is 1.82mm and the coefficient of 2mm thickness is 3.5mm.
The same is true of bending angles.
The coefficient of 90 degrees is 1mm, 60 degrees is 1/2mm, and 45 degrees is 1/3mm. If it is less than 30 degrees, it will not be deducted or 0.5mm will be deducted according to different plate thickness.
The material situation is the same as the plate thickness.
The bending coefficient of different materials is different, and the bending radius is related to the press brake machine.
For standard single V or double V or even the default value of other V slots, this is no problem. However, when a customer needs too small or large bending radius, it should be analyzed in detail.
If the bending radius is too small, our practice is adopting grooving before bending. The bending radius is very small, which is almost a vertical right angle bending.
If the bending radius is too large, the upper die can use the corresponding radius punch (note that the R of the radius punch is the inner R of your bending. If you want the outer R, the upper die should be determined by subtracting a plate thickness from the outer R) .
For getting a larger radius, segmented bending can be used. This requires calculating the initial bending angle, the angle of the last bend, the bending size, angle of each bending as well as the part length.
I think this is largely related to machinery and equipment.
If the press brake has been used for a long time and bend 1.5mm stainless steel over 1m, the sheet should never be bent with 8mm lower die.