How many knives are folded each time when bending a large arc, and how to calculate the bending angle?

Release time：2021-10-12　　　　 Browse times

The first method

Let's look at the picture below

　　

The plate thickness is 2mm, the bending angle is 120 degrees, the external radius is 30, the radius of the neutral layer is 29, and the arc length of the neutral layer is calculated for the arc bending. Therefore, the number of bending tools and the bending angle of each tool are also calculated according to the arc length of the neutral layer, and the distance between the neutral layer and the edge is half of the plate thickness.

In the figure above, how many knives are needed for arc bending, and what is the bending angle of each knife?

If we Cut 2mm per knife.

Number of bending tools = arc length / 2mm = 30.37/2 = 15

Number of bending tools 15

Bending angle 

=180 - {(2 / arc length) x (180 bending angle)} = 180 - {(2 / 30.37) X60} = 176

Bending angle of each knife 176 degrees

If we cannot measure the arc length during bending, we can also calculate it according to the following formula

Bending angle = 180 - {(2 / 3.14x neutral layer radius) x180} = 180 - {(2 / 3.14x29) x180} = 176

If you want to Cut 3mm, replace 2 with 3 in the above formula

Of course, the above formula is a theoretical calculation formula. In actual processing, it will be adjusted according to the results calculated by the above formula.

The second method