Presentation A Quick Technique for Compar-


ing Aeration to Gravity Filled Green Sand Molds (13-1451)


Authors Sam Ramrattan and


Alireza Khoshgoftar, Western Michigan Univ., Kalamazoo, Mich.; Hiroyasu Makino, Minoru Hirata, Shuji Takasu, and Hiroyuki Miyazaki, Sin- tokogio Ltd., Aichi, Japan


Background Most AFS standard


green tests are unable to de- tect the differences between gravity filled green sand and that which has been aeration filled. However,


the friability test and a modified cone jolt test can discriminate between the two sands. In the study, green sand


was aerated in a new, small, portable aeration device that quickly and cost effectively produced AFS sand speci- mens, allowing engineers to compare properties between green sand molds filled via gravity and aeration (Fig. 3).


Conclusions •


The friability test is able to identify differences between gravity filling and aeration sand filling at any target compactibility. •


Fig. 3. The small, portable aeration sand filling system used in the research includes a controller box (left) and aeration chamber (right).


The modified cone jolt test is able to show subtle differences between grav- ity and aeration sand filling (Fig. 4). • Aeration filled green sand specimens sustained a greater number of jolts


May 2013 MODERN CASTING | 59


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