To address the severe shrinkage and porosity issues observed in the central,thick,annular sections of castings produced using furan self-hardening resin sand and static pressure molding processes,a shell mold precision forming process was proposed.This process utilized high-density EPS carved white patterns,coated with multiple layers of inorganic slurry and aggregate.After drying and firing,a high-strength shell mold with a clean inner surface and complete contours was created.This shell mold was embedded in ceramic sand and metal was poured under negative pressure compaction conditions,enhancing the metal's filling,solidification,and feeding capabilities.A dense,smooth-surfaced and precision casting was produced.The shell mold precision forming process employed physical condition control and binder-free ceramic sand,making the process easy to control,stable,reliable,reusable,environmentally friendly,and capable of ensuring product quality with significant comprehensive benefits.
维普
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