The characteristics and disadvantages of the existing coiler mandrel were described and how to improve the property of the coiler mandrel is discussed in the paper.

By test and analysis, the direct reasons leading to failures are the defaults in designing coiler mandrel diameter change and controlling hydraulic system program but not the system parts themselves.

The circular distributor, double-arm mandrel, coiler door and internal mandrel of the coiling station in the High-speed Wire Rod Mill are driven by the hydraulic systems.