Light, versatile, demanding – aluminum requires powerful tools, stable processes, and precise coordination of all parameters for series processing. Whether in automotive manufacturing, medical technology, mechanical and plant engineering, or electronics – aluminum alloys combine low weight with good strength, high corrosion resistance, and excellent recyclability. Despite its generally good machinability, the material continually presents challenges to users. Especially in milling, adhesion, built-up edges, or uncontrolled chip flow can impair process reliability. Therefore, precise coordination of tool geometry, cutting material, cutting data, and coolant lubricant is crucial for economical processing. Paul Horn GmbH offers numerous systems in its tool portfolio that enable economical machining.
The global significance of aluminum is reflected in production figures. Over 60 million tons of the lightweight metal are produced worldwide each year, with Asia, particularly China, playing a driving role. Aluminum is the third most abundant element in the Earth's crust after oxygen and silicon, but it only occurs in bound form. Industrial extraction is carried out from bauxite using the Bayer process and subsequent molten salt electrolysis.
By using targeted alloying elements such as silicon, magnesium, copper, or zinc, the mechanical properties can be adjusted, which in turn has direct effects on the machining behavior.
Pronounced adhesion tendency
When milling aluminum, the material-specific properties become particularly evident. The low hardness and low melting temperature favor high cutting speeds but simultaneously lead to a pronounced adhesion tendency. Without appropriate measures, built-up edges can form, negatively affecting both surface quality and tool life. Modern milling tools for aluminum are therefore characterized by sharp cutting edges, polished chip surfaces, and special chip geometries that support easy chip flow. Additionally, coatings with high sliding properties are used, or – depending on the application – deliberately uncoated edges to maximize sharpness.
HORN offers a comprehensive range of milling tools for aluminum processing, ranging from solid carbide end mills to circular milling tools, as well as PKD and MKD solutions. Especially when milling with high material removal rates, single-edged or double-edged tools with large chip spaces play a central role. They enable high feed rates and cutting speeds without hindering chip flow. Typical applications include pocket milling, plunging, and trimming aluminum components with large material removal.
Polycrystalline diamond
For more demanding tasks and long tool life, diamond-coated tools are primarily used. Polycrystalline diamond is particularly suitable for milling aluminum alloys due to its high wear resistance and low adhesion tendency, especially in high quantities. The sharp cutting edges allow for high surface qualities and stable processes even at high cutting parameters. In addition to classical turning operations, PKD has established itself particularly in milling, such as in face milling of structural components or contour milling of complex geometries.
In recent years, Horn has consistently expanded its PKD portfolio and now offers not only PKD-coated indexable inserts but also solid milling tools specifically designed for high-performance machining. These tools were first introduced in a standardized program in 2024 and cover numerous applications – not only in aluminum but also in other non-ferrous materials. The tool system allows for high rigidity and runout accuracy, which directly impacts surface quality and process stability.
New potentials in high-performance machining
An example of this is the DG interchangeable head system with PKD cutting edges, which is based on an existing carbide system and has been expanded with diamond-coated cutting edges. Due to the modular design, different shank variants made of steel or carbide are available, making the system suitable for applications with large overhangs. Another highlight is a face milling system with precise round and flat run properties. The high rigidity of this system allows cutting values that even powerful milling machines can push to their limits, opening up new potentials in high-performance machining.
For applications with the highest optical requirements, such as in tool and mold making, high-gloss machining with monocrystalline diamonds is additionally used. This cutting material also enables surface qualities in milling that make subsequent polishing unnecessary. This not only saves time but also increases the reproducibility of component quality. Especially for components whose surfaces will be coated or chrome-plated later, this process reliability is a decisive advantage.
Constant quality over long run times
The increasing use of aluminum components, such as through new manufacturing technologies like gigacasting in automotive manufacturing, underscores the importance of powerful milling solutions. At the same time, the use of materials is changing, which presents new demands for flexibility and precision. Modern milling tools must therefore not only enable high removal rates but also ensure constant quality over long run times. With coordinated tool concepts, innovative cutting materials, and application-specific geometries, these requirements can be met, and the economical machining of aluminum can be sustainably optimized.
Contact:
