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Winding Expandable Mandrel

Forty Years of Experience

Description

The original name in Italian is Mandrino Espandibile per Avvolgimento.

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.

There are three types of Winding Expandable Mandrels – Round, Elliptical and Rectangular.

All Winding Expandable Mandrels are build based on the customer’s dimensional requirements, such as:

  1. Diameter Ø Minimum,
  2. Diameter Ø Maximum,
  3. Length Useful,
  4. Length Maximum,
  5. Load Maximum in kg,
  6. Weight in kg.

Customer will be provided with the following information:

  1. № Staves,
  2. № Coil (Bobbin) Supports,
  3. № of wooden supplements’ layers (if needed).

Advantages of our

Winding Expandable Mandrel

  • It can be used both on Vertical and Horizontal Winding Machines,
  • It keeps a constant circumference on the diameter of the coils of the big transformers,
  • It is personalized based on the request of Customer and has customized solutions,
  • We often propose solutions with the wooden supplements’ layers to reduce the quantity of Winding Expandable Mandrels,
  • The monolithic structure and the system of levers can stand the torsion and eliminates the risk of “ovality” during winding,
  • The running support by means of levers makes the cylindrical shape,
  • The wood covering allows for the perfect cylindrical shape,
  • Details and performance can optimize time and quality during the work of winding coils,
  • All Winding Expandable Mandrels are tested before export and the report is attached with manual of instructions.

Technical Information

  • All Winding Expandable Mandrels with a minimum diameter of less than Ø600 mm have a manual (or by cordless screwdriver) Opening and Closing Operational System. For Winding Expandable Mandrels with a minimum diameter bigger than Ø600 mm, Opening and Closing Operational System is motorized (380 Volt, 3 Phase, 50/60 Hz);
  • In 2014 it was researched and developed new internal system of level (\ / \ /). It bears the torsion and reduces the conicity during winding process;
  • 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 made with the use of high durability wood of trees, such as:  American Ash (Biltmore white ash), French Ash (Fraxinus excelsior) and Okumé (Aucoumea klaineana). Wooden coverage is natural, not painted and not treated, no plastic use;
  • 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.

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send us en e-mail to:
info@tecnica80.com

or call us on:
+39 06 92703357

Tecnica 80 S.r.l.

Via Monte Reatini, 26
04011 Aprilia (LT), ITALY

Contact

Phone: +39 069 270-3357
WhatsApp: +39 350 972-5957
Fax: +39 062 549-6338
E-mail: contact@tecnica80.com

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