阅读说明：本技术 一种空调用铝箔及其制备方法 (Aluminum foil for air conditioner and preparation method thereof ) 是由 张海平 包黎明 武日亮 张国良 杨昆 于 2020-07-09 设计创作，主要内容包括：本发明涉及铝合金制造技术领域,公开了一种空调用铝箔及其制备方法。该方法包括以下步骤：(1)将电解铝液、铝锭以及铝合金固体废料放入熔炼炉中,接着依次进行精炼、静置、除气除渣、搅拌和调整成分,并加入铝钛硼丝作晶粒细化,得到铝熔体；(2)将步骤(1)所得铝熔体转移至铸轧机组中进行铸轧,(3)板坯进行一次冷轧,然后进行中间退火和二次冷轧得到铝板带卷,(4)铝板带卷进行4道次箔轧至成品厚度,然后进行分切和成品热处理。该方法通过改善铸轧和冷轧工艺条件,在保证力学性能的情况下,以改善空调用铝箔板面起皮、孔洞和白条缺陷等问题。(The invention relates to the technical field of aluminum alloy manufacturing, and discloses an aluminum foil for an air conditioner and a preparation method thereof. The method comprises the following steps: (1) putting electrolytic aluminum liquid, an aluminum ingot and aluminum alloy solid waste into a smelting furnace, then sequentially refining, standing, degassing and deslagging, stirring and adjusting components, and adding an aluminum-titanium-boron wire for grain refinement to obtain an aluminum melt; (2) transferring the aluminum melt obtained in the step (1) to a casting and rolling unit for casting and rolling, (3) carrying out primary cold rolling on the plate blank, then carrying out intermediate annealing and secondary cold rolling to obtain an aluminum plate strip coil, and (4) carrying out foil rolling on the aluminum plate strip coil for 4 times to reach the thickness of a finished product, and then carrying out slitting and heat treatment on the finished product. The method improves the defects of peeling, holes, white strips and the like of the surface of the aluminum foil plate for the air conditioner by improving the technological conditions of casting and rolling and cold rolling under the condition of ensuring the mechanical property.)

1. The preparation method of the aluminum foil for the air conditioner is characterized by comprising the following steps of:

(1) putting 65-70 parts by weight of electrolytic aluminum liquid, 10-15 parts by weight of aluminum ingot and 15-25 parts by weight of aluminum alloy solid waste into a smelting furnace, heating to 745-765 ℃, then sequentially refining, standing, degassing and deslagging, stirring and adjusting components, and adding an aluminum-titanium-boron wire for grain refinement to obtain an aluminum melt, wherein the aluminum melt comprises the following chemical components in percentage by weight: si: 0.05-0.15%, Fe: 0.3-0.4%, Cu is less than or equal to 0.01%, Mn: 0.2-0.3%, less than or equal to 0.01% of Mg, less than or equal to 0.01% of Cr, Ti: 0.0015 to 0.04 percent, and the balance of Al and inevitable impurities;

(2) transferring the aluminum melt obtained in the step (1) to a casting and rolling unit for casting and rolling, wherein the temperature of a front box during casting and rolling is 697-;

(3) carrying out primary cold rolling on the plate blank obtained in the step (2) in a cold rolling unit until the thickness is 1.8-2.2mm, then carrying out intermediate annealing and secondary cold rolling to obtain an aluminum plate strip coil, and rolling until the thickness is 0.2-0.4 mm; the intermediate annealing process comprises the steps of heating to 450 ℃ within 1-1.5 hours, preserving heat for 8-12 hours, cooling to 120 ℃ within 1-2 hours, and cooling by using rolling oil;

(4) and (4) foil rolling the aluminum plate strip coil obtained in the step (3) for 4 times to the thickness of a finished product, and then slitting and finished product heat treatment are carried out, wherein the porosity is controlled to be 97-98.5% during slitting.

2. The method for preparing an aluminum foil for air conditioners as claimed in claim 1, wherein in the step (1), the amount of the refining agent used in the refining is 0.9 to 1.1Kg/tAl, and the refining time is 20 to 30 minutes.

3. The method for preparing aluminum foil for air conditioners as claimed in claim 1, wherein in the step (1), the degassing and deslagging comprises: introducing high-purity argon into a degassing tank to degas the aluminum melt, wherein the pressure of the argon is 0.45-0.5MPa, the temperature of the degassing tank is 745-750 ℃, and then removing scum which floats to the surface of the aluminum melt along with gas in the degassing tank every other hour.

4. The method for preparing an aluminum foil for air conditioners as claimed in claim 1, wherein in the step (2), the process parameters of the casting and rolling further include: the roller diameter of the roller is 845-855mm, the length of the casting and rolling area is 47-60mm, the water temperature is 23.5-25 ℃, and the water pressure is 0.4-0.5 MPa.

5. The method for preparing an aluminum foil for air conditioners as claimed in claim 1, wherein in the step (3), the first cold rolling is 6 cold rolling passes, and each pass distribution scheme is as follows: 7.3-7.6mm → 6.5-6.7mm → 5.4-5.6mm → 4.3-4.5mm → 3.5-3.7mm → 2.7-2.9mm → 1.8-2.2 mm.

6. The method for preparing an aluminum foil for air conditioners as claimed in claim 1, wherein in the step (3), the second cold rolling is 6 cold rolling passes, and each pass distribution scheme is as follows: 1.8-2.2mm → 1.6-1.8mm → 1.4-1.6mm → 1.2-1.4mm → 0.9-1.1mm → 0.5-0.7mm → 0.2-0.4 mm.

7. The method for preparing aluminum foil for air conditioners as claimed in claim 1, wherein in the step (3), the rolling oil comprises 5-8% of surfactant, 0.2-0.3% of antioxidant, 0.1-0.12% of antiwear agent and the balance of base oil by weight percentage.

8. The method for preparing an aluminum foil for air conditioners as claimed in claim 1, wherein in the step (4), the specific process of 4-pass foil rolling comprises the following steps:

A. cogging pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 350-400 m/min;

B. a first intermediate pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 550-700 m/min;

C. a second intermediate pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 600-700 m/min;

D. and (4) pass of finished products: the roughness of the working roll is 0.15-0.16 μm, and the rolling speed is 450-550 m/min.

9. The method for preparing aluminum foil for air conditioners as claimed in claim 1, wherein in the step (4), the conditions of the finish heat treatment include: winding the finished aluminum foil into an annealing furnace, heating to 250-270 ℃ at the speed of 10-15 ℃/min, preserving the heat for 22-28 hours, then discharging and air-cooling to room temperature.

10. An aluminum foil for air conditioners produced by the method of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of aluminum alloy manufacturing, in particular to an aluminum foil for an air conditioner and a preparation method thereof.

Background

Aluminum is widely used due to its advantages of low density, good thermal conductivity, easy processing, no odor, environmental protection, low price, etc., and the use of aluminum foil for manufacturing heat-conducting fin material of air-conditioning heat exchanger is one of the representatives. Aluminum foil has been used for producing air conditioner heat exchange plates in large scale for more than 20 years in China, and has been developed at a high speed in nearly 10 years. With the development of economy in China and the continuous improvement of the living standard of people, the popularization rate of the air conditioner is improved year by year.

In the production process of the aluminum foil, the defects of peeling, holes and white stripes on the surface of the aluminum foil are easy to occur, so that the performance of the prepared aluminum foil is poor. Therefore, the solution of the defects of peeling, holes and white stripes on the surface of the plate in the production process is an important direction for the current aluminum foil production research.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides an aluminum foil for an air conditioner and a preparation method thereof.

In order to achieve the above object, an aspect of the present invention provides a method for preparing an aluminum foil for air conditioners, the method comprising the steps of:

(1) putting 65-70 parts by weight of electrolytic aluminum liquid, 10-15 parts by weight of aluminum ingot and 15-25 parts by weight of aluminum alloy solid waste into a smelting furnace, heating to 745-765 ℃, then sequentially refining, standing, degassing and deslagging, stirring and adjusting components, and adding an aluminum-titanium-boron wire for grain refinement to obtain an aluminum melt, wherein the aluminum melt comprises the following chemical components in percentage by weight: si: 0.05-0.15%, Fe: 0.3-0.4%, Cu is less than or equal to 0.01%, Mn: 0.2-0.3%, less than or equal to 0.01% of Mg, less than or equal to 0.01% of Cr, Ti: 0.0015 to 0.04 percent, and the balance of Al and inevitable impurities;

(2) transferring the aluminum melt obtained in the step (1) to a casting and rolling unit for casting and rolling, wherein the temperature of a front box during casting and rolling is 697-;

(3) carrying out primary cold rolling on the plate blank obtained in the step (2) in a cold rolling unit until the thickness is 1.8-2.2mm, then carrying out intermediate annealing and secondary cold rolling to obtain an aluminum plate strip coil, and rolling until the thickness is 0.2-0.4 mm; the intermediate annealing process comprises the steps of heating to 450 ℃ within 1-1.5 hours, preserving heat for 8-12 hours, cooling to 120 ℃ within 1-2 hours, and cooling by using rolling oil;

(4) and (4) foil rolling the aluminum plate strip coil obtained in the step (3) for 4 times to the thickness of a finished product, and then slitting and finished product heat treatment are carried out, wherein the porosity is controlled to be 97-98.5% during slitting.

Preferably, in the step (1), the amount of the refining agent in refining is 0.9-1.1Kg/tAl, and the refining time is 20-30 minutes.

Preferably, in step (1), the degassing and deslagging comprises: introducing high-purity argon into a degassing tank to degas the aluminum melt, wherein the pressure of the argon is 0.45-0.5MPa, the temperature of the degassing tank is 745-750 ℃, and then removing scum which floats to the surface of the aluminum melt along with gas in the degassing tank every other hour.

Preferably, in the step (2), the process parameters of the casting and rolling further include: the roller diameter of the roller is 845-855mm, the length of the casting and rolling area is 47-60mm, the water temperature is 23.5-25 ℃, and the water pressure is 0.4-0.5 MPa.

Preferably, in step (3), the first cold rolling is 6 cold rolling passes, and each pass allocation scheme is as follows: 7.3-7.6mm → 6.5-6.7mm → 5.4-5.6mm → 4.3-4.5mm → 3.5-3.7mm → 2.7-2.9mm → 1.8-2.2 mm.

Preferably, in step (3), the second cold rolling is 6 cold rolling passes, and each pass allocation scheme is as follows: 1.8-2.2mm → 1.6-1.8mm → 1.4-1.6mm → 1.2-1.4mm → 0.9-1.1mm → 0.5-0.7mm → 0.2-0.4 mm.

Preferably, in step (3), the rolling oil comprises 5-8% of surfactant, 0.2-0.3% of antioxidant, 0.1-0.12% of antiwear agent and the balance of base oil by weight percentage.

Preferably, in the step (4), the specific process of 4-pass foil rolling comprises the following steps:

A. cogging pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 350-400 m/min;

B. a first intermediate pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 550-700 m/min;

C. a second intermediate pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 600-700 m/min;

D. and (4) pass of finished products: the roughness of the working roll is 0.15-0.16 μm, and the rolling speed is 450-550 m/min.

Preferably, in step (4), the conditions for heat treatment of the finished product include: winding the finished aluminum foil into an annealing furnace, heating to 250-270 ℃ at the speed of 10-15 ℃/min, preserving the heat for 22-28 hours, then discharging and air-cooling to room temperature.

The invention provides an aluminum foil for air conditioners prepared by the method.

According to the preparation method of the aluminum foil for the air conditioner, the problems of peeling, holes, white strip defects and the like of the surface of the aluminum foil for the air conditioner are solved by improving the technological conditions of casting and rolling and cold rolling under the condition of ensuring the mechanical property.

Detailed Description

The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

The invention provides a preparation method of an aluminum foil for an air conditioner, which comprises the following steps:

(1) putting 65-70 parts by weight of electrolytic aluminum liquid, 10-15 parts by weight of aluminum ingot and 15-25 parts by weight of aluminum alloy solid waste into a smelting furnace, heating to 745-765 ℃, then sequentially refining, standing, degassing and deslagging, stirring and adjusting components, and adding an aluminum-titanium-boron wire for grain refinement to obtain an aluminum melt, wherein the aluminum melt comprises the following chemical components in percentage by weight: si: 0.05-0.15%, Fe: 0.3-0.4%, Cu is less than or equal to 0.01%, Mn: 0.2-0.3%, less than or equal to 0.01% of Mg, less than or equal to 0.01% of Cr, Ti: 0.0015 to 0.04 percent, and the balance of Al and inevitable impurities;

(2) transferring the aluminum melt obtained in the step (1) to a casting and rolling unit for casting and rolling, wherein the temperature of a front box during casting and rolling is 697-;

(3) carrying out primary cold rolling on the plate blank obtained in the step (2) in a cold rolling unit until the thickness is 1.8-2.2mm, then carrying out intermediate annealing and secondary cold rolling to obtain an aluminum plate strip coil, and rolling until the thickness is 0.2-0.4 mm; the intermediate annealing process comprises the steps of heating to 450 ℃ within 1-1.5 hours, preserving heat for 8-12 hours, cooling to 120 ℃ within 1-2 hours, and cooling by using rolling oil;

(4) and (4) foil rolling the aluminum plate strip coil obtained in the step (3) for 4 times to the thickness of a finished product, and then slitting and finished product heat treatment are carried out, wherein the porosity is controlled to be 97-98.5% during slitting.

In the method of the present invention, in the step (1), the content of each impurity of the inevitable impurities in the aluminum melt does not exceed 0.015%.

Preferably, in the step (1), the coating-type scrap does not exceed 10 wt% of the aluminum alloy solid scrap.

In a specific embodiment, in step (1), in the smelting furnace, the temperature may be raised to 745 ℃, 750 ℃, 755 ℃, 760 ℃ or 765 ℃.

In a specific embodiment, in the step (2), the front box temperature during casting and rolling may be 697 ℃, 698 ℃, 699 ℃, 700 ℃, 701 ℃, 702 ℃ or 703 ℃; the casting speed can be 900mm/min, 910mm/min, 920mm/min, 930mm/min, 940mm/min, 950mm/min, 960mm/min, 970mm/min, 980mm/min, 990mm/min or 1000 mm/min.

In the method, in the step (1), the amount of the refining agent in refining is 0.9-1.1Kg/tAl, and the refining time is 20-30 minutes.

In the method of the present invention, in the step (1), the degassing and deslagging includes: introducing high-purity argon into a degassing tank to degas the aluminum melt, wherein the pressure of the argon is 0.45-0.5MPa, the temperature of the degassing tank is 745-750 ℃, and then removing scum which floats to the surface of the aluminum melt along with gas in the degassing tank every other hour.

In the method of the present invention, in step (2), the process parameters of the casting and rolling further include: the roller diameter of the roller is 845-855mm, the length of the casting and rolling area is 47-60mm, the water temperature is 23.5-25 ℃, and the water pressure is 0.4-0.5 MPa.

In the method of the present invention, in step (3), the first cold rolling is 6 cold rolling, and each pass allocation scheme is as follows: 7.3-7.6mm → 6.5-6.7mm → 5.4-5.6mm → 4.3-4.5mm → 3.5-3.7mm → 2.7-2.9mm → 1.8-2.2 mm.

In the method of the present invention, in step (3), the second cold rolling is 6 cold rolling, and each pass allocation scheme is as follows: 1.8-2.2mm → 1.6-1.8mm → 1.4-1.6mm → 1.2-1.4mm → 0.9-1.1mm → 0.5-0.7mm → 0.2-0.4 mm.

In the method, in the step (3), the rolling oil comprises 5-8% of surfactant, 0.2-0.3% of antioxidant, 0.1-0.12% of antiwear agent and the balance of base oil by weight percentage.

In the method of the present invention, in the step (4), the specific process of 4-pass foil rolling includes the following steps:

A. cogging pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 350-400 m/min;

B. a first intermediate pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 550-700 m/min;

C. a second intermediate pass: the roughness of the working roll is 0.2-0.24 μm, and the rolling speed is 600-700 m/min;

D. and (4) pass of finished products: the roughness of the working roll is 0.15-0.16 μm, and the rolling speed is 450-550 m/min.

In the method of the present invention, in the step (4), the conditions for heat-treating the finished product include: winding the finished aluminum foil into an annealing furnace, heating to 250-270 ℃ at the speed of 10-15 ℃/min, preserving the heat for 22-28 hours, then discharging and air-cooling to room temperature.

The invention provides an aluminum foil for air conditioners prepared by the method.

According to the preparation method of the aluminum foil for the air conditioner, the problems of peeling, holes, white strip defects and the like of the surface of the aluminum foil for the air conditioner are solved by improving the technological conditions of casting and rolling and cold rolling under the condition of ensuring the mechanical property.

The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.