A machete is usually not used for sheet metal bending 180 degree arc. In the process of sheet metal bending, CNC bending machine is generally used to complete the bending operation.
Nowadays, CNC bending machines usually have the function of bending arcs. The requirements of arc bending are realized through program control. Ordinary 90-degree bending die is used to bend large circular arcs with small angles for many times. When bending a sheet metal, the developed length of the arc, the number of bending knives and the bending angle are calculated.
The unfolding length is calculated according to the length of neutral layer, not according to the arc length of outer or inner mouth. The number of bending knives is calculated according to the arc length of the bending arc, and it is positioned according to each bending movement of 2 mm
The bending angle can be calculated according to the bending angle to be completed and the number of bending knives.