Pettibone, LLC

Other

Robert S Lund

As in the parent application, a freshly mixed quick-setting sand mix is blown from a blow box into a mold while a plunger moves through the blow box to chase all of the fluidized sand into the mold. Here, the blow box sand cavity is formed by a tube extending downward but leaving an annular gap above the blow plate. The fluidizing air tends to move bottom sand directly through the center exit in the blow plate. With quick setting sand, any residue is blown into a purge pan while the plunger is advanced. With sand that is not quick setting, and without the plunger, nearly all residual sand settles and tends to be the first blown into the mold during the succeeding blow.

Method of blowing cores etc. using quick-set sand, and improved

Mold-blowing apparatus

In foundry core-blowing, a blow box snugly fits a plunger which moves through it during the blowing step. In effect, the plunger pushes all of the fluidized sand mix out of the blow box and into the core box. This solves problems which have long impeded the use of quick setting sand mixes in blowing of cores and the like. With more conventional sand mixes better and more uniform packing of the sand in the mold is believed to be achieved. Two measuring feeders are provided supplying two different sand mixes which are non curing when separate but fast setting when mixed. They are mixed in a rapid mixer, dumped into a charging tube which quickly dumps the mix into a blow box. The plunger moves through the charging tube and then through the blow box, cleaning both and aiding in the blowing of all of the sand mix into the mold or the blow tube leading to it. The tip of the blow tube has an internal lip which breaks off any residue or plug retained within this tube.

Method and apparatus for blowing cores etc. using a plunger-cleaned blow

A foundry mold conveyor system for the intermittent movement or indexing of pallets or other mold carriers successively first past a mold receiving station where a foundry sand mold is placed on each empty pallet, then to and through a jacket transfer station where a conventional jacket is placed on each palletized mold, then past a pouring station where each palletized and jacketed mold is poured with molten metal, then back to and through the jacket transfer station where the jacket is lifted from each poured palletized and jacketed mold, then past a mold discharge station where the poured mold is pushed from each pallet, and finally back through the mold receiving station where a fresh sand mold is again placed on each empty pallet. Pallet movements are effected in longitudinal and transverse paths and jacket placing and withdrawal operations are conducted at a single intersection (jacket transfer station) between a longitudinal path and a transverse path by simple up and down vertical motions of a jacket lifter at such intersection. Also, the use of a double length index on one path permits, despite the intersection, an endless system without paths passing over or under one another.

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Elmhurst, IL, United States of America

Robert S Lund