Gelatin coated sand core and method of making same

Details Gelatin coated sand core and method of making same Gelatin coated sand core and method of making same

B - Operations, Transporting

22

C

B22C 9/12 (2006.01) B22C 1/16 (2006.01) B22C 1/22 (2006.01)

Patent

CA 2474248

In a method of making a molded article for use in a casting process, sand particles are mixed with protein and water to effect a coating of protein on the sand particles. Then, the protein coated sand particles are dried and blown into a pattern mold to form a molded article without active cooling of the coated sand particles. Steam is then passed through the molded article to hydrate and melt the protein, thereby forming bonds between contiguous sand particles. Finally, hot, dry air is passed through the molded article to harden the protein bonds between the contiguous sand particles. This forms a protein coated sand core for use in casting molten metals.

L'invention concerne un procédé de fabrication d'un article moulé par un procédé de moulage, dan lequel des particules de sable sont mélangées à une protéine et de l'eau afin de recouvrir les particules de sable d'une couche de protéine. Les particules de sable enrobées de protéine sont alors séchées et soufflées dans un moule de modèle afin de former un article moulé sans refroidissement actif des particules de sable enrobées. De la vapeur est ensuite passée à travers l'article moulé afin d'hydrater et de fondre la protéine, ce qui établit des liaisons entre des particules de sable contiguës. Enfin, de l'air sec, chaud, est passé à travers l'article moulé afin de rigidifier les liaisons protéiques entre les particules de sable contiguës. On obtient ainsi un noyau de sable recouvert de protéine destiné à être utilisé dans le moulage de métaux en fusion.

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