A preparation process of aluminum alloy with low segregation layer thickness

Abstract

The invention relates to an aluminum alloy processing technique, and in particular relates to a preparation technique of an aluminum alloy with a low-thickness segregation layer. The preparation technique comprises the following steps of: filling electrolytic aluminum liquid into a smelting furnace; adding aluminum ingots for cooling; carrying out on-the-spot sample ingredient analysis; regulating the temperature and adding other components; stirring electromagnetically; refining; removing dross from the surface of the aluminum liquid; carrying out the on-the-spot sample ingredient analysis, stewing and purifying the ingredients after the ingredients are qualified; refining grains; filtering the grains by a ceramic filter plate; casting a hot top by means of water cooling; checking whether a product is qualified; saw-cutting the product; homogenizing the product; and packing the product and then putting the product in storage. The preparation technique disclosed by the invention has the beneficial effects that the electrolytic aluminum liquid is directly produced into an aluminum alloy by strict control and co-action of all the steps, furthermore, the cooling speed is increased, the cooling time is shortened, the secondary re-smelting and the re-crystallization are avoided, and the grains are prevented from growing strong, so that the segregation layer is reduced, in conclusion, the invention provides a preparation method of a low-segregation-layer aluminum alloy that is low in production cost, high in environment friendlessness and benefit for development and promotion of enterprises.

Description

technical field

[0001] The invention relates to an aluminum alloy processing technology, in particular to a low segregation layer thickness aluminum alloy preparation technology. Background technique

[0002] In the prior art, aluminum alloys are produced by remelting. Such a method consumes a large amount of capacity and causes serious pollution to the environment. Therefore, there is a need for a method that can directly use electrolytic aluminum liquid to produce aluminum alloys.

[0003] In the process of molten aluminum casting, molten aluminum is injected into the mold. Due to the large amount of molten aluminum in industrial production, high heat content, cooling speed and casting speed, there is a certain gradient in the chemical composition of the outer layer, that is, cooling segregation from the outside to the inside. After the alloy liquid is solidified in the mold, there are often chemical

[0004] The phenomenon of uneven chemical composition is called segrega...

Examples

Embodiment 1

[0034] Follow the steps below to produce 2024 aluminum alloy ingots: pour electrolytic aluminum liquid into the smelting furnace, add aluminum ingots to cool down, analyze the composition of the pre-furnace sample, adjust the temperature and add other components, electromagnetic stirring, refining, remove scum on the surface of the aluminum liquid, and analyze the pre-furnace sample Components, components qualified, standing still, purification, grain refinement, ceramic filter plate filtration, hot-top water-cooled casting, qualified inspection, sawing, homogenization, packaging and warehousing. The above-mentioned added aluminum ingot = 40% of the mass of molten aluminum.

[0035] Refining adopts powder spraying refining process in the furnace, and the gas used is argon.

[0036] Refining agents used in refining include the following components by mass percentage: NaCl: 60%, CaF 2 :2%, Na 2 SO 4 :3%, Na 2 SiF 6 :20%, Na 3 AlF 6 : 15%.

[0037] Ceramic filter plate fi...

Embodiment 2

[0041] The method steps in Example 1 were used to produce 2024 aluminum alloy ingots with a diameter of 150mm. The difference was that the height of the graphite ring in the crystallizer was increased by 20% during the casting stage, the casting speed was 40mm / min, and the thickness of the segregated layer was detected to be 1.2mm.

Embodiment 3

[0043]The method steps in Example 1 were used to produce 2024 aluminum alloy ingots with a diameter of 150mm. The difference was that the height of the graphite ring in the crystallizer was increased by 30% during the casting stage, the casting speed was 40mm / min, and the thickness of the segregated layer was detected to be 1.0mm.

technical field

[0001] The invention relates to an aluminum alloy processing technology, in particular to a low segregation layer thickness aluminum alloy preparation technology. Background technique

[0002] In the prior art, aluminum alloys are produced by remelting. Such a method consumes a large amount of capacity and causes serious pollution to the environment. Therefore, there is a need for a method that can directly use electrolytic aluminum liquid to produce aluminum alloys.

[0003] In the process of molten aluminum casting, molten aluminum is injected into the mold. Due to the large amount of molten aluminum in industrial production, high heat content, cooling speed and casting speed, there is a certain gradient in the chemical composition of the outer layer, that is, cooling segregation from the outside to the inside. After the alloy liquid is solidified in the mold, there are often chemical

[0004] The phenomenon of uneven chemical composition is called segrega...

Examples

Embodiment 1

[0034] Follow the steps below to produce 2024 aluminum alloy ingots: pour electrolytic aluminum liquid into the smelting furnace, add aluminum ingots to cool down, analyze the composition of the pre-furnace sample, adjust the temperature and add other components, electromagnetic stirring, refining, remove scum on the surface of the aluminum liquid, and analyze the pre-furnace sample Components, components qualified, standing still, purification, grain refinement, ceramic filter plate filtration, hot-top water-cooled casting, qualified inspection, sawing, homogenization, packaging and warehousing. The above-mentioned added aluminum ingot = 40% of the mass of molten aluminum.

[0035] Refining adopts powder spraying refining process in the furnace, and the gas used is argon.

[0036] Refining agents used in refining include the following components by mass percentage: NaCl: 60%, CaF 2 :2%, Na 2 SO 4 :3%, Na 2 SiF 6 :20%, Na 3 AlF 6 : 15%.

[0037] Ceramic filter plate fi...

Embodiment 2

[0041] The method steps in Example 1 were used to produce 2024 aluminum alloy ingots with a diameter of 150mm. The difference was that the height of the graphite ring in the crystallizer was increased by 20% during the casting stage, the casting speed was 40mm / min, and the thickness of the segregated layer was detected to be 1.2mm.

Embodiment 3

[0043]The method steps in Example 1 were used to produce 2024 aluminum alloy ingots with a diameter of 150mm. The difference was that the height of the graphite ring in the crystallizer was increased by 30% during the casting stage, the casting speed was 40mm / min, and the thickness of the segregated layer was detected to be 1.0mm.