Multi-furnace combined type fusion casting equipment and technology for producing high-cleanness magnesium or magnesium alloy
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A high-cleanliness, magnesium alloy technology, applied in the field of metal smelting, can solve the problems of similar melt density difference, smoke environmental pollution, and damage to the surface flux protective layer. The effect of dosage
Active Publication Date: 2017-10-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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The disadvantages of the current non-flux smelting equipment are: there are many inclusions suspended in the melt and the density difference from the melt is not large, and the removal of small inclusions is not thorough only by means of natural settlement, floating or filtering by gravity. , so there are many inclusions in die-casting products, which can only be used for non-structural civil products that do not bear force
Among them, the disadvantages of tilting pouring are: there are still suspended fine inclusions in the melt, which will flow out with the molten magnesium; the shaking of the crucible may cause damage to the protective layer of the flux on the surface, resulting in oxidation of the melt; inclusions deposited at the bottom of the crucible may also flow out with the molten magnesium. Flow pouring into castings, process control is difficult; workers need long-term training, careful operation; there is a certain risk and environmental pollution caused by smoke
Relatively speaking, the insulation pipeline conveying type pouring is more advanced, but limited by the refining method, it is still unable to completely remove the suspended fine inclusions remaining in the magnesium liquid
[0005] It can be seen from the above that the two magnesium or magnesium alloy casting processes and equipment currently used in industry cannot produce high-clean magnesium or magnesium alloy melts, and more advanced equipment and processes need to be developed
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Embodiment 1
[0032] The magnesium alloy composition of the present embodiment is as shown in table 1:
[0033] Table 1
[0034]
[0035] Using the multi-furnace combined melting and casting equipment and process of the present invention, the magnesium alloy of Example 1 with high cleanliness is obtained, and its preparation process includes the following steps:
[0036] (1) Preheat the raw materials to 120°C after cleaning;
[0037] (2) Set the temperature of the melting crucible to 700°C and start to heat up. When the melting crucible is dark red, sprinkle RJ-2 flux not exceeding 1% of the mass of pure magnesium on the bottom of the crucible, and add magnesium ingots through the feeding hole. Cover it with a layer of RJ-2 flux not exceeding 1% of the mass of pure magnesium, cover and melt; after the pure magnesium ingot is melted, add other alloy ingredients, stir evenly, and take component samples for inspection.
[0038] (3) After the melting crucible reaches the set temperature, s...
Embodiment 2
[0043] The magnesium alloy composition of the present embodiment is as shown in table 2:
[0044] Table 2
[0045]
[0046] Using the multi-furnace combined melting and casting process and equipment of the present invention, the magnesium alloy of Example 2 with high cleanliness is obtained, and its preparation process includes the following steps:
[0047] (1) The raw materials are cleaned and preheated to 180°C;
[0048] (2) Set the temperature of the crucible in the melting furnace to 780°C and start to heat up. When the crucible in the melting furnace is dark red, sprinkle RJ-6 flux not exceeding 1% of the mass of pure magnesium at the bottom of the crucible, and add magnesium ingots through the feeding hole. , Cover the magnesium ingot with a layer of RJ-6 flux not exceeding 1% of the mass of pure magnesium, cover and melt; after the pure magnesium ingot is melted, add other alloy ingredients, stir evenly, and take a component sample for inspection.
[0049] (3) Afte...
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Abstract
The invention discloses multi-furnace combined type fusion casting equipment and a technology for producing high-cleanness magnesium or a high-cleanness magnesium alloy, and belongs to the technical field of metal smelting. The equipment adopts a plurality of smelting furnaces and mating crucibles for combined operation, and the smelting furnaces consist of a melting furnace, a purifying furnace and a heat preservation holding furnace; the melting furnace and the crucible of the melting furnace are used for melting magnesium or the magnesium alloy; a magnesium melt or a magnesium alloy melt is transferred to the purifying furnace and the crucible of the purifying furnace through an insulating pipeline, and penetrates through a screen mesh structure submerged in a molten flux and a flux layer, and occluded foreign substances in the magnesium melt or the magnesium alloy melt are removed cleanly; and the purified melt is transferred to the heat preservation holding furnace and the crucible of the heat preservation holding furnace through an insulating pipeline for subsequent operation. The magnesium melt or the magnesium alloy melt is purified thoroughly, the operation difficulty of an operation worker is lowered, continuous automatic production can be realized, the production efficiency is high, and the technology has lower pollution to the environment than a traditional technology.
Description
technical field [0001] The invention relates to the technical field of metal smelting, in particular to a multi-furnace combined melting and casting equipment and process for producing high-cleanliness magnesium or magnesium alloys. Background technique [0002] Magnesium or magnesium alloy has a series of excellent properties such as low density, high specific strength, strong electromagnetic shielding, high damping and shock absorption performance, excellent thermal conductivity, high dimensional stability, excellent casting performance, good processing performance, and rich reserves. It has been rapidly developed in industries such as electronic products, transportation, aerospace and weapon manufacturing. [0003] The current magnesium alloy melting and casting equipment can be divided into non-flux smelting type and flux refining and purification type according to the melt treatment process. The flux-free smelting type is usually used for melt preparation in the produc...
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