It is not solely. Die-casting part cracking can be categorized into two types: cold cracking and hot cracking. Cold cracking primarily occurs where the metal at the crack interface remains unoxidized, whereas hot cracking mainly develops in areas where the metal has oxidized.
Common cracks mostly stem from anomalies during the filling and solidification of molten metal—especially irregularities in the solidification stage. When mold temperatures are extremely low or casting geometries are irrational, excessive shrinkage occurs, making cracking highly probable.
If we must link this to the release agent, two scenarios are relevant:
The release agent is applied too dilutely, failing to provide adequate lubrication or film-forming protection;
The release agent has poor thermal insulation performance, leading to abnormal solidification and increasing the risk of cracking.
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