Causes of outer diameter deviation in bunching machine

what is bunching machine?

Mainly used for regular stranding and stranding of multi-strand copper wire, tinned wire, enameled wire, and copper-clad aluminum wire.

Reasons affecting the outer diameter of the stranding

1. Unstable tension:

Fluctuations in wire tension during pay-off or take-up cause uneven tension in the individual wires during stranding, directly affecting the outer diameter of the finished cable.
2. Traction system malfunction:

Slippage of the traction wheel, belt wear, or unstable traction speed (such as vibration or wear of the motor and gearbox) can lead to abnormal stranding pitch and wire diameter.
3. Die and wire diameter mismatch:

Using a die or pressing die with an excessively large aperture causes loose stranding; or using a die with an excessively small aperture forcibly deforms the wire core.
4. Single wire skipping and uneven wire arrangement:

A malfunctioning untwisting mechanism or uneven rotation of the pay-off frame causes arching, crossing, or localized loosening of the individual wires during arrangement, resulting in outer diameter deviation.
5. Single wire diameter exceeding tolerance:

If the initial single wire diameter entering the stranding machine is uneven, the overall outer diameter after stranding will also deviate.