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Vacuum casting: Precision in precision casting
Vacuum casting is used to manufacture high-quality steel, stainless steel, and aluminum parts that meet the highest requirements for dimensional accuracy, surface quality, and material properties.
The vacuum prevents air or gases from entering the mold during the casting process. This results in cast parts that are almost free of pores and shrink holes. At the same time, oxidation of the melt is avoided, which is a decisive advantage with high-quality alloys.
Vacuum casting explained: What's behind it
Vacuum casting, more precisely vacuum precision casting, is a special casting process that is carried out under vacuum conditions. The goal is to prevent air inclusions and oxidation of the metal melt. This results in cast parts that are particularly dense, pore-free, and dimensionally accurate.
The process is closely related to conventional investment casting: First, a wax model of the component is created and coated with ceramic. After the wax is melted out, a high-strength negative mold remains. The melt is then poured into the mold under vacuum. The vacuum ensures that even the finest geometries and complex contours are completely filled.
This process results in cast parts with very smooth surfaces, high detail accuracy, and consistent material quality. Vacuum casting shows its strengths particularly with high-alloy or titanium-based materials that react strongly with oxygen and therefore cannot be cast under normal atmosphere.
How does vacuum casting work step by step
Mold making
The starting point is a wax model that precisely matches the later components. Several of these models are combined into so-called “clusters” and coated with ceramic layers.
Firing the ceramic mold
The wax is melted out and the ceramic is hardened. A hollow, high-strength negative mold is created, which accurately reproduces all model details.
Casting under vacuum
The metal melt (steel, titanium, stainless steel or aluminum) is poured into the mold in a vacuum. The degassed environment prevents gas porosity, the material distributes evenly and also fills fine structures.
Cooling and knocking out
After solidification, the ceramic mold is removed. Cast parts remain, which are very dimensionally accurate and true to their form.
Post-processing
Risers are removed, surfaces smoothed and – depending on the requirement – heat-treated. Mechanical processing can also follow if the tightest tolerances are required.
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Advantages of vacuum casting
Almost pore-free components
Casting in a vacuum creates no air inclusions. The result is dense, homogeneous components without significant pore formation.
No oxidation of the melt
The vacuum protects the metal melt from oxygen influence. This keeps even sensitive alloys free from oxidation.
Excellent dimensional accuracy
Even complex geometries and fine structures are precisely reproduced. Tight tolerances can be reliably maintained.
Very good surface quality
The cast parts exhibit smooth surfaces and fine details, keeping rework effort low.
High material purity
The combination of vacuum and precision casting ensures a clean material structure and consistent mechanical properties.
Wide choice of materials
Vacuum casting is suitable for steel, stainless steel, aluminum, and numerous special alloys. This makes the process versatile.
Combination with heat treatments
The cast parts can also be heat-treated to adjust targeted properties such as hardness or toughness.
Products and application possibilities
Vacuum casting is used wherever components must meet the highest quality standards. The range extends from simple housings to complex functional parts and delicate components with integrated details:
Automotive & Aerospace
Safety-relevant cast parts, structural components
Mechanical engineering
Complex functional parts and precision components
Medical technology
Corrosion-resistant stainless steel components
Energy and turbine technology
Highly stressed stainless steel and superalloy parts
General plant construction
Corrosion- and wear-resistant cast parts
Do you want to know if your component is suitable for vacuum casting?
Then talk to us. We check your data, provide honest advice, and give you a binding offer.
