​At OMCO Metals, long-term partnerships are built on more than technical capability alone. They depend on consistency, reliability and the ability to deliver complex parts on time, year after year.

That is why we are proud to share that we have received a supplier award from Accelleron in recognition of our performance in 2025.

A two-day visit to Hamme

Recently, our Swiss customer Accelleron visited our site in Hamme for a two-day visit. A key part of that visit was a full audit of our operations, which was completed smoothly and closed with a positive result. The visit also created the opportunity to reflect on a partnership that has now been growing for more than 10 years.

Recognition for quality and delivery

The supplier award was granted in recognition of the way OMCO Metals delivers complex cast components, including machining, with a high level of reliability and punctuality. For customers operating in demanding environments, delivering the right part is essential, but delivering it consistently and on time is what builds trust over the long term.

The only supplier in Europe

What makes this recognition even more meaningful is that OMCO Metals received this award as the only supplier in Europe. For our team, this is a strong sign that the daily work behind every casting, every machining step and every delivery makes a real difference.

A result built by people

Awards like this are never the result of one moment. They reflect the combined effort of many people across engineering, production, machining, quality and logistics We would like to thank Accelleron for their trust and for the recognition of our work. And above all, we would like to thank our teams for the precision, commitment and reliability behind this achievement.

If you would like to learn more about OMCO Metals and how we support customers with complex cast components, feel free to contact us at sales@omcometals.com.

When people think about metal casting, they usually picture molten metal filling a mould. What often remains unseen is the role of cores. In many applications, these internal elements determine whether a component will function as intended.

In a foundry, a core is a sand-based component placed inside the mould to create internal geometries. Cavities, channels, internal walls and hollow sections all depend on these internal shapes. Without them, cast parts would be limited to simple, solid forms.

At OMCO Metals, cores play a central role in producing complex cast components. They define internal dimensions, wall thicknesses and functional spaces that cannot be formed by the outer mould alone. This makes core design and execution a critical engineering discipline rather than a secondary step.

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Balancing strength and permeability

One of the main challenges in core making is balance. The sand structures must be strong enough to withstand the thermal and mechanical forces of molten metal during pouring. At the same time, they must remain porous so gases can escape during solidification. If gases are trapped, defects such as porosity or surface imperfections can occur.

Material choice, sand composition, binders and curing processes all influence this balance. Small deviations can already have a significant impact on casting quality and repeatability.

Casting Core Design Starts Before Production

The design phase starts long before a single mould is produced. Engineers analyse 3D geometries, evaluate metal flow and solidification behaviour, and determine how the internal structures will be positioned and supported inside the mould.

Advanced simulations help predict risks such as deformation, hot spots or insufficient feeding. This allows adjustments early in the process, which is essential for components with tight tolerances or functional requirements such as leak tightness.

Execution on the shopfloor

Even with a well-designed solution, execution remains critical. Cores must be handled, placed and verified with care. Experience on the shopfloor plays a decisive role, as small shifts or damage to casting cores can directly affect internal geometry and final performance.

Once the metal has solidified, the sand-based casting cores are removed, leaving behind the internal structure of the metal casting. The casting cores themselves disappear completely, but their influence remains embedded in the final part.

An invisible but decisive process step

The sand cores break down and burn out during the process, and are removed after solidification. What remains is the geometry they created, internal channels, cavities and functional spaces formed directly in the metal.

That is why core making is often the deciding factor between a casting that performs and one that does not. At OMCO Metals, core making is treated as a key competence, combining engineering expertise, process control and craftsmanship to deliver complex and reliable metal castings.

Contact us

If you want to discuss a complex part or internal geometry challenge, contact our team at sales@omcometals.com