AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE-DIETERTSHELL MOULD TENSILE ACCESSORY (AFS)IGENERAL PRINCIPLESThe Shell Mould Tensile Accessory (AFS) is designed to produce an AFS standard tensilespecimen from shell moulding materials.IIDESCRIPTIONThe Shell Mould Tensile Accessory (AFS) includes a split 3-cavity pattern (former plates) formaking ¼ inch thick tensile specimens, a hopper strike-off assembly, and two inserts whichshould be attached to the support straps at the back of the standard Tensile Core StrengthAccessory for testing on the Universal Sand Strength Machine.IIITEST PROCEDURE(a)(b)(c)(d)(e)Heat the base plate to approximately 200 °C in an oven (or enclosed stove).Stand the hopper strike-off assembly on to its broad edge and fill with pre-coatedsand mixture so that the mixture in the three pockets is level with the ends.Place a pair of COLD split moulds in position on the heated base plates.Spray all surfaces coming into contact with the sand mixture with a silicone (mould)release agent.Rest the strike-off edge of the hopper strike-off assembly against the edge of theopen cavities of the pattern, and dump the sand into the cavities in one swift motion.101