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Bucket tooth thermal cracks is produced during solidification process

hits:2744    date:2018-10-09

The thermal cracks problem for finished liebherr excavator lock pins is appeared during the solidification process, due to the excavator bucket tooth casting piece is exist into the plasticity deformation state at this time. Under the influence of cavity wall thermal transition effect, the metal liquid would start to solid from the casting pieces surface, but produce a big amount of dendritic crystal to forming into an entirety framework, then forming into solidification shrinkage, but professional liebherr excavator lock pins production supplier said there still exist a thin film, which doesnt fully solidified among the dendritic crystal.

If there has no resistance force to liebherr excavator lock pins casting pieces solidification process, it means the dendritic crystal would never bearing any stress force, the casting piece would shrinkage with the freedom way, so its internal space would produce certain stress force.

But under the influence of cavity and cavity core resistance force, the shrinkage of dendritic crystal would be influenced by tensile strength effect, so the anti tensile stress force would appeared on dendritic crystal layer, as long as it beyond the limited liquid film strength, the liebherr excavator lock pins would produce thermal cracks due to less metal liquid flowing to tensile breakage positions.

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