B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/159
B22C 9/10 (2006.01) B22C 9/12 (2006.01) B22C 13/08 (2006.01)
Patent
CA 1205613
ABSTRACT A method for the production of hollow foundry sand cores in which binder coated sand is cured in the core pattern cavity of a core box using an amine catalyst gas to form a hollow sand core, and uncured binder coated sand is discharged and recovered from the cavity of the hollow sand core. Fresh binder coated sand and recovered binder coated sand are volumetrically metered alternately to a blow head so that at no time is there a mixture of the two sands in the blow head. The metered binder coated sand in the blow head is blown by compressed air through an investment aperture in the top of the core box into the core pattern cavity. After gassing, an uncured binder coated sand is discharged and recovered from hollow sand cores while fresh binder coated sand is being metered to the blow head. Metering of fresh binder coated sand is discontinued after a predetermined period of time equivalent to about 1/10 to about 1/3 of the bench life of the binder coated sand. At this point, metering of recovered binder coated sand to the blow head is commenced and continued until essentially all of the sand is consumed in hollow core formation. The metering of fresh binder coated sand is then recommenced and the procedure repeated.
450083
Macrae & Co.
Michelson Anatol
LandOfFree
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