Experimental and Numerical Study of Sand Core Molding Process

摘要

The results of experimental study and numerical simulations of resin bonded sand/air flow in THETA-shape corebox are presented. A computer controlled electronic system is designed and built to measure pressure and air flow rate inside the corebox during mold filling, gassing and purging cycles of Phenolic urethane amine (PUA) process. The contour maps of the pressure distributions inside the corebox were created based on barometric measurements. A good agreement between experimental results and numerical simulations was found. Special experiments were conducted to measure the variation of the pressure with the length of resin bonded sand bed. A non-linear relationship was found between pressure drop and sand bed length over wide ranges of volume flow rates of air.