Series 745 mechanical expansion shaft

Mechanical Expansion Shaft Series 745: Engineered for Maximum Torque and Precision

The Vorwald Series 745 mechanical expansion shaft with continuous expansion leafs is purpose-built for superior clamping performance, especially in applications involving very narrow or thin-walled cores. Designed with a robust, user-friendly structure, this expansion shaft offers exceptional service life and high torque transmission, setting a new standard for high-speed winding operations.

Available in two surface variants—lengthwise grooved and polyurethane-coated—the Series 745 can handle a wide variety of core materials:

• Lengthwise grooved leafs (aluminium or steel): Ideal for paper cores, providing maximum torque transmission.
• Polyurethane-coated leafs: Optimised for plastic and steel cores, ensuring smooth, efficient clamping without slippage.

Each expansion leaf is securely bolted to an expansion lug, supported by integrated leg springs for reliable contraction. This allows for quick and effortless mounting and removal of material cores.

Powerful, Concentric Clamping with Pneumatic Precision

The Series 745 operates on a mechanical wedge principle enhanced by pneumatic actuation. Compressed air pushes a cone beneath each expansion lug via a threaded rod, converting axial movement into precise radial expansion. The result?

• Extremely strong and even clamping force
• Absolutely concentric expansion across all leafs
• Vibration-free high-speed winding

For applications demanding even greater clamping power, an optional hydraulic booster can be integrated into the pneumatic piston system.

Modular Design with Custom Options

The shaft body is available in multiple materials and wall thicknesses based on application needs and is built using Vorwald’s modular design approach. This allows for:

• Custom journal designs
• Optional cantilevered versions
• Special diameters on request
• Flexible compressed air connections (axial, radial, or both)
• Leaf materials including steel, aluminium, or PU-coated

Advantages at a Glance

• Exceptional load capacity for heavy reels
• Concentric clamping = Higher web speeds
• High torque transmission
• Easy handling and installation
• Minimal maintenance
• Shaft diameters from 68 to 600 mm

For engineering teams and machine builders looking for a reliable, high-performance core clamping solution, the Vorwald Series 745 stands out for its durability, precision, and customisability. Whether you're dealing with delicate plastic cores or heavy-duty steel applications, this expansion shaft delivers uncompromising performance at every turn.