Cores Made from Water-soluble Materials for Foundry Technology

Complex Cavities in Casting Components with Salt-based Cores

Water-soluble, salt-based cores are used to produce complex casting components in foundry technology and offer numerous advantages compared to conventional sand cores.

Cores Made from Water-soluble Materials for Foundry Technology

  • Advanced Ceramics for Metal Working

    Special Reproduction of Ceramic Applications, Issue September 2016

    • Language: PDF, 3.2 MB

    • Language: PDF, 3.2 MB

Salt cores, or simply cores, are used in foundry technology to manufacture casting components as placeholders for cavities in casting molds. The metallic smelt forms an impression of the component shape and the salt core is flushed out once the component has cooled off. The lost mold technique is applied to the process, forming cavities in metal components. Compared to sand cores, which are commonly used in foundries, salt cores have the advantage that they are guaranteed to be absolutely residue-free. This increases process safety in manufacturing and the quality of the cast component.

Brown preforms (rings)

Brown preforms (rings)

Preforms (special components)

Preforms (special components)

Preforms (special components)

Preforms (special components)

Worth knowing:

Water-soluble, salt-based cores

  • Cores for piston casting and low-pressure die casting
  • Residue-free, core removal to protect casting components
  • Emission-free machining, no gas drainage during casting and core removal
  • Complex shapes and geometries available
  • High strength and rigidity of the cores
  • Very smooth core surfaces
  • No porosity/casting errors due to core gases
  • Very environmentally friendly
  • Can also be used in die casting

The water-soluble salt-based cores in the shape of a ring are used in the conventional pressed disk method of production. The core-shooting process allows for complicated shapes and designs. Cores are manufactured in line with proven ceramic principles and materials are developed on the basis of special salt mixtures. Continuous system advancements already make it possible to use salt cores in die casting today. Moreover, suitable, emission-free, inorganic binder systems are also used.

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