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Causes of “Wrinkling” in Lost Foam Casting and How to Prevent It

2026-02-03

Causes of Wrinkling

1. Low pouring temperature

2. Poor vaporization of the foam pattern

3. Poor mold permeability

4. Excessively fast pouring speed

Solutions

1. Adjust pouring temperature
Wrinkling occurs mainly in ductile iron castings and is rarely seen in cast iron or carbon steel castings. Wrinkles tend to appear on the upper surface of ductile iron castings. Raising the pouring temperature appropriately can help prevent surface wrinkling.

2. Improve vaporization conditions
Poor vaporization often results from a combination of low pouring temperature and fast pouring speed. Foam that cannot vaporize in time is pushed to the top surface by molten metal, forming wrinkles. Slowing down the pouring speed and adding a slag collector at the top surface can effectively prevent wrinkling.

3. Enhance mold permeability
Poor permeability of the sand, often caused by excessive fine dust, reduces vacuum efficiency and prevents combustion gases from being removed in time. This can lead to iron-slag mixtures floating on the surface, causing wrinkling. Removing fine dust from the sand and improving its permeability can effectively prevent this defect.

4. Control pouring speed
Pouring too quickly can push incompletely vaporized foam to the top surface, creating wrinkles. Maintaining a reasonable and stable pouring speed is crucial to preventing wrinkling.

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