Method and apparatus for producing a foundry mold
AssigneeGeorg Fischer Aktiengesellschaft
InventorsErwin Buhrer, deceased, by Grete Brandli, heir, by Lotte Roth, heir, by Doris Baumann, heir
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Abstract
A mold filling and compacting method includes forming a compact body of mold substance such as sand in an intermediate container and then abruptly opening the bottom closure of the container while releasing the sand, as a compact mass, so that it drops as a packet into the mold box, compacting itself effectively around a pattern arrangement. Specific techniques for releasing, including sudden lifting, sudden dropping and separating the container parts are disclosed as well as apparatus for performing the method.
Claims13
A process for producing a foundary mold comprising the steps of
- providing a molding box on a pattern plate for receiving molding sand,
- providing an intermediate container to receive molding sand from a supply thereof, the intermediate container having an openable bottom closure,
- precompacting the molding sand in the intermediate container;
- locating the intermediate container above the molding box, and
- abruptly opening the bottom closure of the intermediate container and suddenly releasing the body of sand contained therein so that the body of sand falls as a packet and is deposited in the molding box.
An improved apparatus for producing a foundry mold of the type having a pattern on a pattern plate and a molding box for receiving molding sand around the pattern, the apparatus being of the type having means for loading compact sand into the molding box including a molding sand silo, an intermediate container locatable below the silo and having an openable bottom closure, and drive means for opening and closing the closure, the improvement wherein
- said intermediate container includes a movable frame;
- and wherein said apparatus further comprises
- means for forming a precompacted sand body in said intermediate container;
- and
- means for abruptly changing the elevation of said intermediate container during opening of said bottom closure.
Dependencies are inferred from the claim text.