These zigzag springs are made piece by piece but not in rolls, the 2 ends are made to a custom design.
First, let’s take a look at how it is made on a CNC bending machine. The video is quite straightforward so you can easily understand the process.
|Material||C70 (carbon steel)|
|Wire diameter||3.0 mm|
|Dimension (relaxed)||length 80 * width 60 mm|
|heat treatment||230℃, 30 minutes|
As you may notice, the 2 ends are bent to custom design, that is why they need to be bent piece by piece on a CNC machine.