Pre-tensioned sand core

B - Operations – Transporting – 22 – C

Patent

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Details

B22C 9/00 (2006.01)

Patent

CA 2583505

Provided are methods of replacing drilling holes in castings by pre-tensioning sand cores. This methods are used in long cylindrical shaped sand cores in cold core box processes. The urethane sand core is placed in compression to increase the core strength during handling, placing inside of the mold. The pre-tensioned urethane sand core is set in a casting mold so as to form a cavity in the casting mold. The molten metal is poured to form the cavity inside of the casting. The pre-tensioned urethane sand core maintains its initial shape during casting.

Cette invention concerne des procédés permettant de remplacer des trous forés dans des pièces coulées par des noyaux en sable précontraints. Ces procédés sont utilisés dans des noyaux en sable longs de forme cylindrique lors de processus de moulage à froid avec trous. Le noyau en sable d'uréthane est placé en compression, de façon à accroître la résistance du noyau pendant la manutention, à savoir son positionnement à l'intérieur du moule. Le noyau en sable d'uréthane précontraint est durci dans un moule de coulage, afin d'y former une cavité. Le métal fondu est versé pour former la cavité à l'intérieur de la pièce coulée. Le noyau en sable d'uréthane précontraint conserve sa forme initiale pendant le coulage.

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