CNC milling of aluminium sheets

CNC milling technology at a glance

CNC milling (Computerized Numerical Control) refers to the computer-aided machining of workpieces using rotating cutting tools. Particularly with aluminium sheets, this process offers high precision, consistent quality and flexible design options for industrial components. Modern CNC machines work with multiple axes (e.g. 3-axis, 5-axis milling) and enable complex geometries with small tolerances.

Advantages of CNC milling for aluminium

Aluminium is an ideal material for CNC milling due to its strength, lightness and machinability. CNC-controlled processes ensure:

• Dimensionally accurate cut pieces with high repeat accuracy
• Clean cut edges without burr formation
• Minimal tolerance deviations, even with complex contours
• High machining speed and therefore short lead times

Particularly in series production or for one-off parts with high requirements for dimensional accuracy, CNC milling is clearly superior to conventional cut to size.

Typical areas of application for CNC-milled aluminium sheets

Mechanical and plant engineering

CNC-milled aluminium sheets serve as base plates, adapters, housing parts or modular connecting elements. The precise machining of holes, threads or milled pockets eliminates manual reworking.

Vehicle and prototype construction

In vehicle cabins, trailers or special-purpose vehicles, milled aluminium sheets are used for mounts, cladding or interior elements. Particularly for prototypes, CNC allows fast and exact implementation of the design data.

Electrical engineering & automation

Carrier plates for control components, mounting plates or front panels for control panels are frequently milled from aluminium. The electrical conductivity of the material combined with precisely fitting machining makes CNC the standard.

Medical technology and precision engineering

Here, particular requirements apply to surface quality, reproducibility and material compatibility. CNC machining ensures that even complex components are implemented exactly.

Machining options for CNC milling of aluminium sheets

Depending on the requirement, various machining steps are possible:

• Face milling to produce flat surfaces
• Pocket milling for recesses or cut-outs
• Contour milling for machining external shapes
• Drilling and thread cutting directly on the machine
• Edge machining with chamfers or radii

Individual special machining operations can also be realised without difficulty by means of CAD/CAM data implementation.

Tolerances & quality standards

When CNC milling aluminium sheets, tight tolerances can be maintained, e.g. in the range of ±0.1 mm or finer. The precision depends on the material, the machine calibration and the experience of the supplier. For functional components, reliable tolerance compliance is decisive in order to carry out subsequent processes such as assembly or bolting without reworking.

Materials and alloys

The following aluminium alloys are particularly suitable for CNC milling processes:

• EN AW-5083: high strength, readily weldable
• EN AW-5754: corrosion-resistant, readily machinable
• EN AW-6082: high machinability, very popular for milled components

Depending on the application, the raw material is processed untreated, anodised or coated.

From the CAD file to the CNC cut

The machining process starts with a CAD file containing the exact geometry data. After programming in the CAM system, the workpiece is clamped in the CNC machine, aligned and manufactured automatically. Our dimensionally accurate cut pieces can be combined seamlessly with CNC machining – plannable directly online via our configurator.

CNC milling for aluminium sheets brings efficiency and quality

Industrial customers who value precise, repeatable results benefit from CNC milling of aluminium through high manufacturing reliability, flexible design and economical implementation. Particularly for complex milled parts or high requirements for the surface, CNC technology is the process of choice.

Realise precise milled parts: get advice on CNC milling or configure your aluminium sheet directly with the appropriate cut to size and machining.

FAQ

What does CNC milling of aluminium sheets cost? The costs depend on complexity, machining effort, material and quantity. Simple parts start in the low double-digit euro range, more complex series can be considerably more expensive.

How quickly can CNC machining be implemented? Small series or one-off parts can be realised within a few working days. The prerequisite is a finished CAD file and material availability.

What data is required for CNC milling? As a rule, 2D or 3D CAD data in DXF, STEP or IGES format is sufficient. If required, a technical drawing can also serve as a template.

Can coated sheets also be CNC-milled? Yes, anodised or powder-coated sheets can also be machined. Careful selection of the tools is required in order not to damage the surface.

Can small series or prototypes also be realised economically? Thanks to digital data transfer and short set-up times, small quantities can also be realised efficiently. CNC is particularly suitable for individual prototypes and pre-series.