DIGITAL PNEUMATIC SAND SQUEEZER TEST The digital pneumatic sand squeezer has been widely accepted as a better representation of the compressing action similar to an automatic molding machine than the rammer. The digital readout also eliminates potential operator reading error, as it is much simpler to read a number than lining up a ruler scale. The pneumatic tester consists of a pneumatic regulator and a valve that controls the feed pressure into a cylinder. The compactability, displacement and squeeze pressure are automatically calculated and digitally displayed after the cylinder compresses the sand sample. SPECIMEN WEIGHT WITH THE DIGITAL TEST Bulk density is inversely proportional to compactability. Since different sands have different densities, moisture contents, and other compositional differences, the amount of sand required to make a standard sand specimen can vary from foundry to foundry and from day to day. If you do not know the sand weight required to make a standard sand specimen, then start with approximately 165 grams and you can enter this starting sand sample weight into the digital pneumatic squeezer. With the starting sand weight programmed into the squeezer, the exact weight can be determined automatically by the squeezer after the first test is completed. Figure 2: (a) Sand Rammer (b) Digital Pneumatic Sand Squeezer and (c) The Automatic Compactability Controller Figure 3: A Summary of results of the Pneumatic Digital Squeezer and the traditional 3-ram on the same sand sample for 6 green sand systems from 2022 AFS Sand Casting Conference 16
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