Continuous differential-pressure casting method wherein molten metal temperature is estimated from consumption amount of pouring tube due to immersion in molten metal
First Claim
1. A continuous differential-pressure casting method wherein a plurality of casting cycles are continuously performed with respective molds and a common mass of molten metal accommodated in a container, such that in each casting cycle, a cavity formed in the corresponding mold is filled with the molten metal through a pouring tube which is connected at one end thereof to a sprue hole of the mold and immersed at the other end thereof in said common mass of molten metal, said molten metal being introduced into said cavity due to a difference between pressures to which each of said molds and said container are exposed, respectively, to cast an article having a shape corresponding to that of said cavity, said method comprising the steps of:
- detecting a degree of consumption of the pouring tube which occurs at said other end and which changes with an actual temperature of said mass of molten metal in said container, after a predetermined number of casting cycles are completed;
obtaining an estimated temperature of said mass of molten metal, on the basis of the detected degree of consumption of said pouring tube, and according to a predetermined relationship between said degree of consumption and said estimated temperature; and
regulating said actual temperature of said mass of molten metal, on the basis of a difference between the obtained estimated temperature and a predetermined desired temperature of said mass of molten metal.
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Abstract
A casting method wherein casting cycles are continuously performed with respective molds and a common mass of molten metal accommodated in a container, such that in each casting cycle, the mold cavity is filled with the molten metal through a pouring tube connected at one end to a sprue hole of the mold and immersed at the other end in the molten metal mass, due to a difference between pressures to which the mold and the container are exposed, and wherein the molten metal temperature is estimated from the detected amount of consumption of the immersed tube, and the actual molten metal temperature is regulated, on the basis of a difference between a predetermined desired temperature of the molten metal, and the estimated temperature which changes with the actual temperature.
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Citations
37 Claims
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1. A continuous differential-pressure casting method wherein a plurality of casting cycles are continuously performed with respective molds and a common mass of molten metal accommodated in a container, such that in each casting cycle, a cavity formed in the corresponding mold is filled with the molten metal through a pouring tube which is connected at one end thereof to a sprue hole of the mold and immersed at the other end thereof in said common mass of molten metal, said molten metal being introduced into said cavity due to a difference between pressures to which each of said molds and said container are exposed, respectively, to cast an article having a shape corresponding to that of said cavity, said method comprising the steps of:
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detecting a degree of consumption of the pouring tube which occurs at said other end and which changes with an actual temperature of said mass of molten metal in said container, after a predetermined number of casting cycles are completed; obtaining an estimated temperature of said mass of molten metal, on the basis of the detected degree of consumption of said pouring tube, and according to a predetermined relationship between said degree of consumption and said estimated temperature; and regulating said actual temperature of said mass of molten metal, on the basis of a difference between the obtained estimated temperature and a predetermined desired temperature of said mass of molten metal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of estimating a temperature of a mass of molten metal, comprising the steps of:
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immersing a consumable material in said mass of molten metal, under a predetermined condition of immersion of said consumable material in said mass of molten metal, wherein said consumable material consists of an end portion of a pouring tube through which the molten metal is transferred from a container to a cavity formed in a casting mold; detecting a degree of consumption of said consumable material after immersion thereof in said mass of molten metal under said predetermined condition, said degree of consumption changing with an actual temperature of said mass of molten metal; and obtaining an estimated temperature of said mass of molten metal, on the basis of the detected degree of consumption of said consumable material, and according to a predetermined known relationship between said estimated temperature and said degree of consumption of said consumable material under said predetermined condition of immersion. - View Dependent Claims (35, 36, 37)
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Specification