Series 811 expansion chuck

Vorwald series 811 expansion chuck

The Vorwald series 811 expansion chuck is a standard expansion chuck with individual expansion lugs that is suitable for universal use in virtually any winding process. The interface to the machine flange or existing cylinder has an extremely straightforward design, making it possible to switch over to other expansion chuck diameters quickly. 
Several types of expansion lug are available to cover all requirements: longitudinally grooved steel expansion lugs and polyurethane expansion lugs with smooth surfaces or bolted versions with different surface profiles that can be quickly interchanged. The customer’s requirements determine how many expansion lugs there are inside the mantle and where these lugs are placed.
The hardened steel expansion lugs are available with a wide range of different surfaces to ensure maximum torque transmission into the different core materials. All expansion lugs are equipped with a retraction system that ensures that they slide back safely. This makes it easy to slide the cores on and off. Expansion leaves are also possible as an alternative to the expansion lugs. Expansion chucks with expansion lugs or leaves are available for cores with internal diameters ranging from 50 to 500 mm.

The functional principle relies on the use of an inclined plane. The clamping mechanism can be activated by an integrated pneumatic cylinder or by an external component located in the machine. During this process, the cone is pushed under the expansion lugs like a wedge. The cone and expansion lugs have the same bevel. This creates a radial movement from an axial one. This arrangement provides the expansion chuck with a very large clamping force. Another very important advantage is that the clamping of the cores is perfectly centred, as all expansion lugs expand evenly. This enables very high winding speeds to be achieved.
The mantles of the expansion chucks can be made from a large number of materials with various wall thicknesses – depending on the customer’s application. The expansion chucks are based on the Vorwald standard and are custom-made using a modular concept.

Options

• Expansion lugs or leaves with various surfaces
• Quick adjustment to different core diameters using adapters
• Special dimensions are available on request