Making subcutaneous flow-channels in foam patterns

Metal founding – Process – Shaping a forming surface

Reexamination Certificate

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C164S035000, C164S036000, C164S045000

Reexamination Certificate

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06880618

ABSTRACT:
Method of making a subcutaneous melt flow-channel in the surface of a fugitive foam pattern used in lost-foam casting process. After a refractory skin has been formed on the surface of a foam pattern, a strip of the skin is treated so as to cause the foam underlying the strip to recede from the strip and leave a groove in its stead. Suitable treatments include (1) heating the strip, or (2) applying a foam solvent thereto that soaks through the skin. In each case, the treatment is such as to cause the foam underlying the treated strip to soften and recede from the strip.

REFERENCES:
patent: 4651799 (1987-03-01), Chandley
patent: 6189598 (2001-02-01), Chandley et al.
patent: 2-263537 (1990-10-01), None
“A metal accelerator method used in the lost foam casting process”Research Disclosure #445057,May, 2001.

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