Replacing olivine sand with ACCUCAST ceramic casting media reduces cleaning costs and eliminates veining defects.
A gray and ductile iron job shop using olivine sand in the lost foam process was experiencing high burn-on of media to the castings. In addition, veining defect and distortion of casting roundness occurred, resulting in longer cleaning times and higher production costs. Their goal was to cast cleaner and more dimensionally precise parts.
Previous testing had shown the round and spherical shape of ACCUCAST ceramic media provides better flow properties, and its lower thermal expansion prevents various casting defects. Because olivine is very angular, it requires more energy for flow. In lost foam, the additional energy can lead to deformation of the foam patterns that results in reduced dimensional precision of the final part. Also, the more angular shape and higher thermal expansion of olivine can lead to increased burn-on of the media to the metal casting.
With the use of ACCUCAST ceramic casting media, cleaning costs were reduced, the veining defect was eliminated, burn-on was minimized and the desired casting dimensions were achieved. Also, the higher flow properties resulted in increased production of complex parts.