MEDEKO - Your partner for castings and machining

Investment casting

Basic product information

Materials

We use a wide range of steel and bronze materials. Stainless, refractory, austenitic, martensitic and other types of steel.

Dimensions

Standard casting weights range between 0.1 kg and 10 kg.

Tolerances

  • Tolerance class 1 according to STN EN ISO 8062-3 : 2007
  • Tolerance classes D1, D2, D3 according to VDG P690

Quality

Quality control is a fundamental element of our investment casting process. It starts from the receipt of materials and is maintained across the entire manufacturing process.

We are sure that our manufacturing process is stable and the quality of the last casting is just the same as the first one.

Our quality management relies on an integrated quality management system conforming to ISO 9001:2008. We are also holders of certificates P.E.D., ISO 14001:2004 and OHSAS 18001:2007.

References

We will be pleased to present you our references in person. Among our customers are renowned global corporations as well as small-sized local businesses.

Why investment castings from us?

  • Samples available within 30 days
  • Fast series production start-up
  • The quantity is up to you - we can manufacture any amount
  • Top quality at unmatched prices
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Benefits of investment castings

  • Reduction/elimination of machining 
  • Ready-cast holes and cavities 
  • Mass reduction, allowing very thin-section castings 
  • Excellent stiffness-to-weight ratio 
  • Ability to cast sophisticated inner and outer sections 

Industrial applications

Precision investment castings find application in a wide range of industries. Our castings are suitable for all industrial sectors.

Our customers include large machinery corporations as well as specialist small firms manufacturing to order.

Sectors to which we supply our castings include the transport, machinery engineering, food-processing, energy, healthcare, arms industries and many others.

Technical assistance and customer project support

Our aim is to work jointly with our customers and contribute to their casting projects already from the design stage. We can translate years-long experience of Medeko engineers into very efficient cooperation. Series production starts only when the casting design has been optimised. The result is high casting quality at an excellent price.

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Investment casting process

Step one - Mould making based on the customer documentation. A drawing and a 3D model provide a basis for the mould making and start of production.

Step two - Wax model making and assembly. To make a casting, first we must produce its positive wax copy using injection moulding tools. Such wax models are then adhered to a runner system and thus form what is called a tree.

Step three - Ceramic shell making. The trees are first dipped in a slurry, a mixture of special bonding agents and ceramic sands, and then sanded. This process is repeated 6 to 10 times. The tree must dry for some time between two coatings.

Step four - Burnout and ceramic shell firing. After the ceramic shells have dried, hot pressurised steam is used to remove the wax from the ceramic shell. Then, the empty shell is fired in an annealing furnace at approx. 1,100 °C. Now the shell is sufficiently strong and ready for the casting.

Step five - Casting. The molten metal is poured directly into the annealed shells. This is where we are able to assure high surface quality and dimensional precision.

Step six - Shell removal, and cutting away and finalisation of castings. Casting are separated from the runner system and undergo further heat treatment and machining according to customer's wishes.

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Rapid prototyping in investment casting

All the more frequently our customer demand only very small amounts of units to be manufactured, or even a single one. In such case, it is not necessary to expend money on the mould production. With the rapid prototyping technology, we can make a positive casting model which will substitute the conventional wax model. Rapid prototyping is suitable for unit or small-series manufacture.

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Heat treatment and mechanical machining of castings

A majority of castings receive heat treatment and are further mechanically machined according to customer requirements. Most common casting machining operations include drilling, milling and turning. Other special machining operations can be delivered on demand.

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Surface quality and surface finishing

MEDEKO makes efforts to deliver a product that is completely finished. Where the casting requires further surface treatment, we are able to provide plating with zinc, nitride, or nickel; polishing; electrolytic polishing; lacquering; powder lacquering.

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Mould manufacture

We employ the most advanced technologies in the mould manufacture, including 5-axis machining centres and latest CAD system versions. High-quality design and workmanship of the mould are the key to a high-quality casting.

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