TH59796A - Deoxidation casting method and deoxidation casting machine. - Google Patents

Abstract

DC60 (13/05/45) In the deoxidizing casting method, unused metal remaining in the feeder (16) can be easily removed from the casting (60), or molten metal remaining in the feeder (16) can be easily removed from the casting (60) to obtain the casting (60). The method consists of a step of pouring molten metal into the cavity (12b) of the die (12) and the reaction of a deoxidizing compound with the molten metal to deoxidize the oxide film formed on the surface of the molten metal. The method is characterized in such that the cooling rate of the molten metal in the feeder (16) of the die (12) is lower than the cooling rate of the molten metal in the cavity (12b), and that the molten metal in the feeder (16), which is not solidified, is actuated when the molten metal in the cavity (12b) is solidified to make the outline of the casting (60) match the outline of the desired product. In the deoxidizing casting method, any unused metal remaining in the feeder (16) can be easily removed from the casting (60), or any remaining molten metal in the feeder (16) can be easily removed from the casting (60) to obtain the casting (60). The method consists of a step of pouring the molten metal into the cavity (12b) of the die (12) and the reaction of a deoxidizing compound with the molten metal to deoxidize the oxide film formed on the surface of the molten metal. The method is characterized in such that the cooling rate of the molten metal in the feeder (16) of the die (12) is lower than the cooling rate of the molten metal in the cavity (12b), and that the molten metal in the feeder (16), which is not solidified, is acted upon when the molten metal in the cavity (12b) is solidified to make the outline of the casting (60) conform to the outline of the desired product.

Claims (15)

1. The deoxidizing casting method consists of the following steps: pouring molten metal into the cavity (12b) of the die (12), including a feeder (16) positioned between the molten metal inlet (12a) and the cavity (12b), and reacting a deoxidizing compound with the molten metal to deoxidize the oxide film formed on the surface of the molten metal. A characteristic feature is that the cooling rate of the molten metal in the feeder (16) is lower than the cooling rate of the molten metal in the cavity (12b), and the molten metal in the feeder (16), which is not solidified, is operated on when the molten metal in the cavity (12b) is solidified to conform the outline of the cast product (60) to the desired product outline. 2. The method under claim 1 in which molten metal in the feed head (16), which is not solidified, is pressed into the cavity (12b) to make the outline of the casting (60) conform to the desired product outline. 3. The method under claim 1 in which molten metal in the feed head (16), which is not solidified, is removed from the solidified casting product (60) in the cavity (12b). 4. The method under claim 3 in which the parts making up the cavity (14a, 14b) of the die (12) can be separated from the parts making up its feed head (17), and the parts making up the cavity (14a, 14b) where the molten metal is solidified is separated from the parts making up the feed head (17), while the molten metal in the feed head (16) is not solidified. 5. The method under claim 3 in which the path (80) for dispensing molten metal is provided to the feeder (16) and the molten metal in the feeder (16), which is not solidified, is dispensed out when the molten metal in the cavity (12b) is solidified. 6. Any of the methods under claims 1-5 in which molten aluminum or molten aluminum alloy and magnesium nitride compounds formed by feeding magnesium gas and nitrogen gas into the die (12) are used as deoxidizing compounds. 7. Any of the methods under claims 1-5 in which molten aluminum or molten aluminum alloy and magnesium nitride compounds formed by the reaction of magnesium gas with nitrogen gas are fed into the die (12) as deoxidizing compounds. 8. Deoxidizing die casting, in which a deoxidizing compound reacts with the molten metal to deoxidize the oxide film formed on the surface of the molten metal. It consists of a die (12) with a molten metal inlet (12a), a cavity (12b) through which the molten metal is poured, and a feeder (16) positioned between the molten metal inlet (12a) and the cavity (12b), where the cooling rate of the molten metal in the feeder (16) is lower than the cooling rate of the molten metal in the cavity (12b). It is characterized by a pathway (50) for pushing the unsolidified molten metal in the feeder (16) to the cavity (12b). Once the molten metal in the cavity (12b) is solidified, it conforms to the outline of the cast product (60) to match the desired product outline. 9. A deoxidizing die casting under claim 8 in which the thermal insulation of the pressure path (50) is higher than the thermal insulation of the die casting (12b). 10. A deoxidizing casting machine pursuant to claim 8 or 9 where the pressure path is compressed air. 11. A deoxidizing casting machine pursuant to claim 10 in which the compressed air is a non-oxidizing gas for feeding deoxidizing compounds into the cavity (12b), a metal gas for producing deoxidizing compounds in the cavity (12b), or a reactive gas for reacting with the metal gas in the cavity (12b). 12. A deoxidizing die in which a deoxidizing compound reacts with the molten metal to deoxidize the oxide film on the surface of the molten metal consists of a die (12) with a molten metal inlet (12a), a cavity (12b) in which the molten metal is poured from the inlet (12a), and a feeder (16) positioned between the molten metal inlet (12a) and the cavity (12b) in which the cooling rate of the molten metal in the feeder (16) is lower than the cooling rate of the molten metal in the cavity (12b). It has the specific characteristic that: The cavity components (14, 14a, 14b) of the die (12) can be separated from the feeder components (17), and the cavity components (14, 14a, 14b) where the molten metal is solidified are separated from the feeder components (17), while the molten metal in the feeder (16) is not solidified. 13. A deoxidizing die in which a deoxidizing compound reacts with molten metal to deoxidize an oxide film formed on the surface of the molten metal consists of a die (12) with a molten metal inlet (12a), a cavity (12b) in which molten metal is poured from the inlet (12a), and a feeder (16) positioned between the molten metal inlet (12a) and cavity (12b) in which the cooling rate of the molten metal in the feeder (16) is lower than the cooling rate of the molten metal in the cavity (12b). It is characterized by a discharge pathway (80) for the molten metal, which is not solidified in the feeder (16) and discharged outwards when the molten metal in the cavity (12b) is solidified. 14. Any of the de-occlusion casting machines under claims 8-13 where the thermal insulation of the feed head (16) is higher than the thermal insulation of the cavity (12b). 15. Any of the de-occlusion casting machines under claims 8-13 in which a thermally insulating lubricant is supplied to the inner surface of the feed head (16) and a non-thermally insulating lubricant is supplied to the inner surface of the cavity (12b).