초록 ▼

Disclosed is a molten metal injector system including a holder furnace, a casting mold supported above the holder furnace, and a molten metal injector supported from a bottom side of the mold. The holder furnace contains a supply of molten metal having a metal oxide film surface. The bottom side of

Disclosed is a molten metal injector system including a holder furnace, a casting mold supported above the holder furnace, and a molten metal injector supported from a bottom side of the mold. The holder furnace contains a supply of molten metal having a metal oxide film surface. The bottom side of the mold faces the holder furnace. The mold defines a mold cavity for receiving the molten metal from the holder furnace. The injector projects into the holder furnace and is in fluid communication with the mold cavity. The injector includes a piston positioned within a piston cavity defined by a cylinder for pumping the molten metal upward from the holder furnace and injecting the molten metal into the mold cavity under pressure. The piston and cylinder are at least partially submerged in the molten metal when the holder furnace contains the molten metal. The cylinder further includes a molten metal intake for receiving the molten metal into the piston cavity. The molten metal intake is located below the metal oxide film surface of the molten metal when the holder furnace contains the molten metal. A method of injecting molten metal into a mold cavity of a casting mold is also disclosed.

대표청구항 ▼

Disclosed is a molten metal injector system including a holder furnace, a casting mold supported above the holder furnace, and a molten metal injector supported from a bottom side of the mold. The holder furnace contains a supply of molten metal having a metal oxide film surface. The bottom side of

Disclosed is a molten metal injector system including a holder furnace, a casting mold supported above the holder furnace, and a molten metal injector supported from a bottom side of the mold. The holder furnace contains a supply of molten metal having a metal oxide film surface. The bottom side of the mold faces the holder furnace. The mold defines a mold cavity for receiving the molten metal from the holder furnace. The injector projects into the holder furnace and is in fluid communication with the mold cavity. The injector includes a piston positioned within a piston cavity defined by a cylinder for pumping the molten metal upward from the holder furnace and injecting the molten metal into the mold cavity under pressure. The piston and cylinder are at least partially submerged in the molten metal when the holder furnace contains the molten metal. The cylinder further includes a molten metal intake for receiving the molten metal into the piston cavity. The molten metal intake is located below the metal oxide film surface of the molten metal when the holder furnace contains the molten metal. A method of injecting molten metal into a mold cavity of a casting mold is also disclosed. e mold-holder with said mold through approximately 180° around a substantially horizontal axis such that incipient solidification in coldest regions of the mold before mold rotation is avoided, rotating said mold holder around said substantially vertical axis so as to bring said mold holder with said mold in a third position where the mold is conveyed from said mold holder to a cooling station, whereby said mold holder becomes available for a further mold. 2. A process according to claim 1, wherein said closing step is carried out in less than approximately ten seconds after the end of the filling step. 3. A process according to claim 1, wherein said turning step is completed at most fifteen seconds, preferably five seconds, after the closing step is completed. 4. A process according to claim 2, wherein said turning step is completed at most fifteen seconds, preferably five seconds, after the closing step is completed. 5. A process according to claim 1, further comprising the further steps of positioning a solid cooler in said mold at a position remote from said feed runner while said half-frames are arranged with their respective half-prints facing upwardly, and recovering said cooler after said alloy has solidified. 6. A process according to claim 1, wherein said connecting step is performed by moving the mold in translation to the feeding tube. 7. A process according to claim 6, wherein the step of moving the mold in translation is performed by sliding the mold relative to the mold holder. 8. A process for molding a casting made of light alloy, comprising the following steps: providing a mold having a metal frame housing a print made of physically setting sand, said frame being defined by a pair of metal half-frames each carrying a half-print, said print having therein a feed runner in communication with a mold cavity and opening to the outside through an opening provided in the frame, for feeding a mold cavity with molten alloy and incorporating a movable closure member for closing off said feed runner; placing at least one solid cooler in said mold at a location remote from said feed runner; assembling said half-frames to each other; arranging the mold so that the feed runner extends in a lower part of the mold and in a substantially horizontal direction, and the solid cooler is located in an upper part of the mold; sealingly connecting the feed runner to a feeding tube capable of delivering molten metal alloy; applying pressurized metal alloy to the feeding tube so as to fill the mold cavity with said alloy; and before solidification of the casting, closing said movable closure member, and then turning the mold-holder with said mold through approximately 180° around a substantially horizontal axis, whereby the feed runner is now located in the upper part of the mold and the solid cooler is located in the lower part of the mold, such that incipient solidification in coldest regions of the mold before mold rotation is avoided and a propagation of the alloy solidification occurs substantially upwardly from said at least one solid cooler. 9. A process according to claim 8, wherein said solid cooler is made of metal. 10. A process according to claim 8, further comprising a step of recovering said at least one solid cooler from the mold after solidification of the casting. 11. A process according to claim 9, further comprising a step of recovering said at least one solid cooler from the mold after solidification of the casting. 12. A process according to claim 8, wherein any cooler included in the mold is disposed away from the feed runner area. 13. A process for molding a casting made of light alloy, comprising the following steps: providing a mold having a metal frame housing a print made of physically setting sand, said frame being defined by a pair of metal half-frames each carrying a half-print, said print having therein a feed runner in communication with a mold cavity and opening to the outside throug