Randafronding van verschillende werkstukken
AFRONDING VAN DE RANDEN

Voor meer veiligheid en langere levensduur

Werkstuk vóór de randafronding Werkstuk na randafronding

Afhankelijk van het fabricageproces hebben werkstukken van de meest uiteenlopende materialen scherpe randen. Om procesmatige of haptische redenen moeten deze meestal worden afgerond voor verdere verwerking.

De meest economische oplossing voor het afronden van randen van in massa geproduceerde werkstukken is glijslijpen. Zelfs zeer delicate werkstukken met hoge kwaliteitseisen kunnen met dit proces economisch, reproduceerbaar en nauwkeurig worden afgerond.

Er moet echter op worden gelet dat de materiaalverwijdering beperkt blijft tot de te bewerken randen en dat de andere oppervlakken van het werkstuk worden beschermd.

Wij bieden u 's werelds meest uitgebreide assortiment van bewerkingsproducten en een breed portfolio glijslijpinstallaties voor optimale randafronding.

Edges – more than just deburred

Sheet metal part with clearly visible, sharp-edged cut edges and fine burrs along the edges.

Technically, edge rounding is an extension of the deburring process. At a certain point, depending on factors such as the type of grinding media or the machine used, deburring transitions into edge rounding.

While traditional deburring often only removes a small burr or creates minimal edge breaking — because the parts are supposed to remain “burr-free but sharp-edged,” — edge rounding aims for a uniform, defined radius.

Overview: Types of Edges?

  • Sharp edge: A workpiece edge that has not been post-processed.
  • Broken edge: An edge where burrs have been removed, often by manual grinding (edge breaking).
  • Chamfered edge: An edge beveled, often at 45°, usually in preparation for welding.
  • Rounded edge: An edge rounded with a defined radius, for example by mass finishing (vibratory finishing) or blasting processes.

What do you need to know about edge rounding?
Frequently asked questions

Microscope image of a metal workpiece before and after edge rounding

Sharp sheet metal edges or workpiece edges can disrupt functionality, cause injury during assembly, damage components, or create problems during coating of the metal parts—for example, because powder coating does not adhere properly. Careful deburring and edge rounding are therefore essential.

With modern machines, edges can be precisely rounded with a defined edge radius of up to 2 mm. This reproducible deburring process significantly improves the quality, functionality, and durability of metal parts.

High energy disk systems for edge rounding

In the metalworking industry, edge rounding is a standard step in sheet metal production. After punching, laser cutting, or other separation processes, parts often have sharp, burred cutting edges that must be rounded—especially before powder coating. This applies to many metals, including steel, stainless steel, and aluminium.

The requirements for edge rounding vary by application: in decorative elements, aesthetics matter most, while in functional components, safety and corrosion resistance are crucial.

Schematic representation of the painting or coating of a workpiece before and after edge rounding

If a sheet metal edge is sharp, especially with burrs, the coating thickness (e.g., powder coating) is often reduced because the coating does not adhere properly. This leads to higher corrosion risk—the most common cause of flaking and premature rust.

Defined edge rounding increases the surface area, allowing the coating to flow more evenly around the edge, resulting in uniform layer thickness, mechanical stability, and durable corrosion protection. Rounded edges also improve handling safety and ensure a longer service life.

There are numerous reasons why metal edge rounding increases the service life of sheet metal and other metal parts. Sharp edges are more prone to corrosion because they provide a larger attack surface for moisture and contaminants. Rounded edges are less susceptible and therefore more resistant.

In addition, mechanical wear, tool wear, and edge chipping occur much faster in everyday use when sharp edges remain. By rounding to a defined edge radius, loads are distributed more evenly, reducing the risk of cracks or fractures.

Ceramis Multishape media for edge rounding

Yes. Inner edges can — and must — also be rounded to a defined edge radius, while remaining burr-free. This step is vital for product safety: rounded inner edges prevent sharp edges from damaging pneumatic hoses or cables. Mass finishing technology offers the optimal solution here as well.
The patented Multishape media is especially effective for processing internal edges.

Microscope image of a cutting edge (drill bit) before and after edge rounding

For cutting tools such as drills and milling cutters, edge rounding is crucial. By rounding cutting edges to a defined radius, mechanical stability is increased, reducing the risk of microchipping. This significantly extends tool life and reduced tool wear.

Fully automatic system for edge rounding with dry electropolishing

For carbide tools, edge rounding is a proven method to prevent microchipping. Rounded edges also improve the surface quality of the machined parts, reducing burrs and uneven cutting marks. Particularly demanding machining tasks can be performed effecively in DLyte machines.

Konservierungslinie fĂŒr Entgraten, OberflĂ€chenreinigen und Lackieren

For large or complex workpieces, blasting processes are often the best option. Both dry and wet blasting methods are available. A typical example is a fully automated line in which deburring, edge rounding, surface cleaning, and coating are integrated—such as in a preservation line for steel components.

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