阅读说明：本技术 一种铝型材用的熔铸铝棒的熔炼工艺 (Smelting process of fusion cast aluminum bar for aluminum profile ) 是由 曹岩 黄亮 张家豪 于 2020-07-08 设计创作，主要内容包括：本发明公开了一种铝型材用的熔铸铝棒的熔炼工艺,包括以下步骤；步骤一、备料：步骤二、熔炼原料：步骤三、精炼处理：步骤四、挤压成型：将熔炼炉降温至420-450℃,送入挤压机中铝棒经挤压机挤压形成铝型材；步骤五、冷却：将得到的铝型材自然通风30-50min,再经过冷风机快速降温；步骤六、后续处理：对铝型材在抛光机上进行机械抛光,然后对其表面喷涂防氧化涂料形成防氧化涂层。本发明严格控制合金化温度,并采用合理的原料添加顺序,有效保障了合金铝液成分的精度,原料烧损少的熔铸铝棒耐候性强,能够保证铝棒具有较好的抗氧化性能,提高铝合金的纯净,提高了强韧性,减小了内应力,其综合性能强,提高了使用过程中的安全性。(The invention discloses a smelting process of a fusion cast aluminum bar for an aluminum profile, which comprises the following steps of; step one, preparing materials: step two, smelting raw materials: step three, refining treatment: step four, extrusion forming: cooling the smelting furnace to 420-450 ℃, and feeding the smelting furnace into an extruder to extrude an aluminum bar into an aluminum profile through the extruder; step five, cooling: naturally ventilating the obtained aluminum profile for 30-50min, and rapidly cooling by an air cooler; step six, subsequent treatment: and mechanically polishing the aluminum profile on a polishing machine, and spraying an anti-oxidation coating on the surface of the aluminum profile to form an anti-oxidation coating. The invention strictly controls the alloying temperature, adopts reasonable raw material adding sequence, effectively ensures the precision of the components of the alloy aluminum liquid, has strong weather resistance of the casting aluminum bar with less raw material burning loss, can ensure that the aluminum bar has better oxidation resistance, improves the purity of the aluminum alloy, improves the obdurability, reduces the internal stress, has strong comprehensive performance and improves the safety in the using process.)

1. A smelting process of a fusion casting aluminum bar for aluminum profiles is characterized by comprising the following steps: comprises the following steps;

step one, preparing materials:

s1, calculating and weighing the raw materials in required parts by weight according to the component requirements of the aluminum bar of the aluminum profile;

s2, cleaning and drying the surfaces of the raw materials to ensure that the raw materials are free of moisture, silt and oil stains;

step two, smelting raw materials:

s1, firstly, flatly paving the aluminum scraps and the crushed sectional materials in a smelting furnace to fill the bottom, and then casting large aluminum ingots and waste materials;

s2, heating to 730-;

s3, controlling the temperature of the smelting furnace at 735-755 ℃, adding the copper, zinc, manganese, chromium and aluminum-silicon intermediate alloy into the melt, fully stirring, then adding magnesium until the intermediate alloy is completely melted, and fully stirring;

step three, refining treatment:

s1, adding a refining agent into the smelting furnace and introducing nitrogen to carry out refining treatment for 20-30 min;

s2, continuously stirring for 30-45min after refining, then carrying out slagging-off treatment, sampling from the central position of the smelting furnace, carrying out refining, and then analyzing and adjusting components until the components are qualified;

s3, uniformly distributing 0.5-0.8kg of refiner in each ton of melt in a smelting furnace, and standing for 20-30 min;

step four, extrusion forming: cooling the smelting furnace to 420-450 ℃, and feeding the smelting furnace into an extruder to extrude an aluminum bar into an aluminum profile through the extruder;

step five, cooling: naturally ventilating the obtained aluminum profile for 30-50min, and rapidly cooling by an air cooler;

step six, subsequent treatment: and mechanically polishing the aluminum profile on a polishing machine, and spraying an anti-oxidation coating on the surface of the aluminum profile to form an anti-oxidation coating.

2. The melting process of the fusion cast aluminum bar for the aluminum profile according to claim 1, characterized in that: in the first step, the raw materials comprise magnesium, copper, zinc, manganese, chromium and aluminum-silicon intermediate alloy.

3. The melting process of the fusion cast aluminum bar for the aluminum profile according to claim 1, characterized in that: in the second step, the smelting raw materials need to be preheated, and the temperature is continuously increased to 100 ℃ at the temperature increasing speed of 5 ℃ per minute and is kept for 30 min.

4. The melting process of the fusion cast aluminum bar for the aluminum profile according to claim 1, characterized in that: and in the second step S3, analyzing a melt sample in the smelting furnace to obtain result data, calculating the addition amount of the alloy elements and weighing, and carrying out alloying operation.

5. The melting process of the fusion cast aluminum bar for the aluminum profile according to claim 1, characterized in that: in the third step S1, the water content of the nitrogen gas is greater than 15PPm, and the oxygen content is greater than 15 PPm.

6. The melting process of the fusion cast aluminum bar for the aluminum profile according to claim 1, characterized in that: and seventhly, the thickness of the anti-oxidation coating is 20-30 microns.

Technical Field

The invention relates to the technical field of aluminum profile processing, in particular to a smelting process of a fusion casting aluminum bar for an aluminum profile.

Background

Aluminum alloys are the most widely used class of non-ferrous structural materials in industry and have found a number of applications in the aerospace, automotive, mechanical manufacturing, marine and chemical industries. The rapid development of industrial economy has increased the demand for aluminum alloy welded structural members, and the research on the weldability of aluminum alloys is also deepened. Currently, aluminum alloys are the most used alloys;

however, in the prior art, the aluminum alloy has low smelting and casting quality, and the product quality and production efficiency cannot be guaranteed, so that the strength and elongation of the aluminum alloy are low, the aluminum alloy is easy to deform and even break mechanical parts, and certain safety risks are caused in use occasions in the field of high safety.

Disclosure of Invention

The invention aims to provide a smelting process of a fusion casting aluminum bar for aluminum profiles, and the smelting process is used for solving the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a smelting process of a fusion cast aluminum bar for an aluminum profile comprises the following steps;

step one, preparing materials:

s1, calculating and weighing the raw materials in required parts by weight according to the component requirements of the aluminum bar of the aluminum profile;

s2, cleaning and drying the surfaces of the raw materials to ensure that the raw materials are free of moisture, silt and oil stains;

step two, smelting raw materials:

s1, firstly, flatly paving the aluminum scraps and the crushed sectional materials in a smelting furnace to fill the bottom, and then casting large aluminum ingots and waste materials;

s2, heating to 730-;

s3, controlling the temperature of the smelting furnace at 735-755 ℃, adding the copper, zinc, manganese, chromium and aluminum-silicon intermediate alloy into the melt, fully stirring, then adding magnesium until the intermediate alloy is completely melted, and fully stirring;

step three, refining treatment:

s1, adding a refining agent into the smelting furnace and introducing nitrogen to carry out refining treatment for 20-30 min;

s2, continuously stirring for 30-45min after refining, then carrying out slagging-off treatment, sampling from the central position of the smelting furnace, carrying out refining, and then analyzing and adjusting components until the components are qualified;

s3, uniformly distributing 0.5-0.8kg of refiner in each ton of melt in a smelting furnace, and standing for 20-30 min;

step four, extrusion forming: cooling the smelting furnace to 420-450 ℃, and feeding the smelting furnace into an extruder to extrude an aluminum bar into an aluminum profile through the extruder;

step five, cooling: naturally ventilating the obtained aluminum profile for 30-50min, and rapidly cooling by an air cooler;

step six, subsequent treatment: and mechanically polishing the aluminum profile on a polishing machine, and spraying an anti-oxidation coating on the surface of the aluminum profile to form an anti-oxidation coating.

Preferably, in the first step, the raw materials include magnesium, copper, zinc, manganese, chromium and aluminum-silicon intermediate alloy.

Preferably, in the second step, the smelting raw material needs to be preheated, and the temperature is continuously increased to 100 ℃ at a temperature increasing speed of 5 ℃ per minute and is kept for 30 min.

Preferably, in step S3, a sample of the melt in the melting furnace is taken and analyzed to obtain result data, and then the alloying operation is performed by calculating and weighing the added amount of the alloying element.

Preferably, in step three S1, the nitrogen has a water content greater than 15PPm and an oxygen content greater than 15 PPm.

Preferably, in the seventh step, the thickness of the oxidation preventing coating is 20 to 30 μm.

The smelting process of the fusion cast aluminum bar for the aluminum profile has the beneficial effects that: the invention strictly controls the alloying temperature, adopts reasonable raw material adding sequence, effectively ensures the precision of the components of the alloy aluminum liquid, has strong weather resistance of the casting aluminum bar with less raw material burning loss, can ensure that the aluminum bar has better oxidation resistance, improves the purity of the aluminum alloy, improves the obdurability, reduces the internal stress, has strong comprehensive performance, greatly improves the process and the finished product quality of the casting and improves the safety in the using process.

Detailed Description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.