Winding Expandable Mandrel

High Quality, Best Performances

Forty years of experience in the construction of Winding Expandable Mandrels

The Winding Expandable Mandrel (WEM) is a symbol of our commitment to innovation and precision in the industrial engineering sector. Meticulously designed for superior efficiency, our Winding Expandable Mandrels are set to transform your winding processes completely.

Our Winding Expandable Mandrel achieved the goal of maintaining the diameter of the coils of the big transformers despite the maximum and minimum width required by the customer.

This is possible, as we build them using a carrying structure made of a central axle and two flanges, an upper and a lower one, joined by a set of screws to build a monolithic structure able to support the torque. Two running supports are assembled on the central axle, one opposite to the other, and both handled by two screws, a right and a left one. The steel beams are assembled on running guides operated by a running support to act as levers that build the cylindrical shape.

The wooden coating allows the final work to be done, thus obtaining the perfect cylindrical shape. Opening and Closing process is motorized from a minimum diameter of 600 mm, while for the smaller sizes it is manual or with a cordless screwdriver.

Advantages of our Winding Expandable Mandrel

The Winding Expandable Mandrel keeps a constant circumference on the diameter of the coils of the big transformers,
Each Winding Expandable Mandrel is personalized based on the request of Customer and has customized solutions such as specific Diameters and Lengths,
Our shapes are equipped with a motorized opening and closing system for diameters greater than 600 mm, while for smaller ones, a wireless actuator is used,
The monolithic structure and the system of levers are able to stand the torsion and eliminate the risk of “ovality” during winding,
The running support by means of the levers makes the cylindrical shape,
The wood covering allows for the perfect cylindrical shape of the Winding Expandable Mandrel,
Can be used for vertical and horizontal winding,
Details and performance are able to optimize time and quality during the work of winding coils,
All mandrels are tested before export.

Technical Information

Tolerance on cylindricity is 0,5 mm for mandrels from 200 to 600 mm and 1 / 1,5 mm for the ones from 600 to 3000 mm,
Wooden coverage of the staves with high durability “French Ash”,
Galvanic Treatment on the steel monolithic structure to avoid the rust over the years,
The number of battens ensures a better roundness of the Winding Expandable Mandrel,
Starting from a minimum diameter of 600 mm, Opening and Closing process is Motorized,
Can be used both on vertical and horizontal winding machines.