Rotary forging for high-performance aluminium wheel rims.

Optimised grain structure and controlled material distribution.
Lightweight components engineered for high structural strength and fatigue resistance.

The Challenge

High-performance and premium automotive applications demand wheel rims that combine low weight with exceptional mechanical resistance.

Traditional cast aluminium wheels present several inherent limitations. To achieve the required strength, manufacturers often need to increase material thickness, which results in heavier components and less efficient designs.

Casting processes may also introduce internal defects that compromise structural performance under cyclic loads.

Manufacturers required a solution capable of delivering:

• Reduced component weight
• High structural integrity
• Improved fatigue resistance
• Consistent internal material structure
• Reliable industrial production

The objective was clear: engineer strength into the material rather than compensate with additional mass.al shape while maintaining full control over material flow, temperature and forming forces.

The DENN Solution

DENN implemented a controlled rotary forging process using RF machines to produce forged aluminium wheel rim preforms with optimised internal structure.

Instead of pouring molten aluminium into a mould, rotary forging plastically deforms a solid aluminium billet through a controlled combination of rotational motion and axial compression.

During the process:

• The upper tool operates at a fixed inclination angle
• The billet rotates while axial pressure is applied
• Material flows radially under controlled deformation
• Grain structure is compacted and reoriented
• The billet size is optimised to avoid unnecessary material mass

This controlled plastic deformation eliminates the internal defects commonly associated with casting and produces a dense, refined microstructure.

The aluminium is not cast into shape.
It is forged into structure.

The Result

Rotary forged aluminium wheel rims deliver significant performance advantages:

Refined and compacted grain structure

Improved fatigue resistance under cyclic loads

Higher structural integrity compared to cast wheels

Reduced risk of internal porosity and casting defects

Optimised weight-to-strength ratio

Stable and repeatable industrial production

The forged preform provides a structurally superior base for subsequent machining and finishing operations.

Process Data

Part: Aluminium forged wheel rim
Industry: Automotive / performance vehicles
Material: Aluminium alloy
Technology: Rotary forging
Machines: DENN RF series
Process type: Billet rotary forging for structural preforms

Why It Matters

In wheel manufacturing, performance is not defined by appearance, it is defined by internal structure.

Rotary forging creates a dense and controlled material architecture capable of withstanding demanding mechanical stresses while maintaining reduced mass.

At DENN, we do not simply form aluminium.
We engineer its internal structure through controlled rotary deformation, ensuring strength, reliability and repeatability from the very first forming stage.