METHOD AND APPARATUS FOR BLOWING CORES ETC. USING A PLUNGER-CLEANED BLOW BOX SUITABLE FOR QUICK-SET SAND

摘要

ABSTRACT OF THE DISCLOSUREIn foundry core-blowing, a blow box snugly fits aplunger which moves through it during the blowing step. Ineffect, the plunger pushes all of the fluidized sand mixout of the blow box and into the core box. This solvesproblems which have long empeded the use of quick settingsand mixes in blowing of cores and the like. With moreconventional sand mixes better and more uniform packing ofthe sand in the mold is believed to be achieved. Twomeasuring feeders are provided supplying two different sandmixes which are non curing when separate but fast settingwhen mixed. They are mixed in a rapid mixer, dumped into acharging tube which quickly dumps the mix into a blow box.The plunger moves through the charging tube and thenthrough the blow box, cleaning both and aiding in theblowing of all of the sand mix into the mold or the blowpassage leading to it. This may be in the form of a blowtube which has at its tip an internal lip which breaks offany residue or plug retained within this tube.