DUNS Number:527982762
Causes and Preventive Measures of Casting Shrinkage
2024-06-07 10:19
liquid alloy in the solidification process, due to cooling and solidification shrinkage.
The reasons for casting shrinkage can be summarized as follows:
Alloy solidification characteristics: liquid alloy in the solidification process, due to cooling and solidification shrinkage, the internal liquid will continue to supplement the solidification layer, but with the thickening of the solidification layer, the internal residual liquid due to volume reduction, the liquid level drops, and eventually in the upper part of the casting Shrinkage.
Unreasonable casting design: improper design, such as unreasonable arrangement of structural dimensions, defects in the mold, especially in the structure of the mold diversion system, resulting in excessive melt rising speed without effective diversion, resulting in shrinkage defects.
Inclusion in castings: inclusions are mixed in castings, which cannot be integrated into the melt and separated during solidification, resulting in shrinkage cavity and shrinkage porosity defects.
External factors: such as low mold temperature, resulting in poor melt fluidity, so that the melt can not be fully drained, precipitation, accumulation in the cavity to form shrinkage.
Improper temperature and pressure control: excessive temperature or sudden decrease, instability, and unreasonable pressure will affect the solidification of the melt, resulting in deformation and shrinkage and porosity defects.
