Method for easy removal of sand cores from castings

Details Method for easy removal of sand cores from castings Method for easy removal of sand cores from castings

B - Operations, Transporting

22

D

B22D 29/00 (2006.01) B22D 29/02 (2006.01) B29C 33/54 (2006.01)

Patent

CA 2025826

Sand cores are removed from metal or plastic coatings by exposing the cores to a humid atmosphere for a sufficient time to weaken the binder of the sand cores. The sand is then shaken from the casting. Metal or plastic castings with hollow passages are produced by forming a casting around the sand core bound with a suitable binder followed by exposing the casting and sand core to a humid atmosphere and then shaking the sand from the casting.

Les noyaux en sable sont retirés des moulages de métal ou de plastique en les exposant à un milieu humide pendant une période suffisamment longue pour que le liant des noyaux soit affaibli. Le sable est évacué du moulage par secouage. Les moulages de métal ou de plastique ayant des passages creux sont obtenus en formant un moulage autour du noyau en sable lié à l'aide d'un liant approprié, puis en exposant le moulage et le noyau en sable à un milieu humide et, en évacuant ensuite par secouage le sable du moulage.

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