阅读说明：本技术 一种高延伸换热器用铝箔及其制备方法 (Aluminum foil for high-elongation heat exchanger and preparation method thereof ) 是由 赵旭东 曾元 王毓玮 曹世民 吴保剑 李高林 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种高延伸换热器用铝箔及其制备方法,其组成成分及质量百分比为：Si 0.6～0.7％,Fe 0.8～0.9％,Cu 0.03～0.05％,Mn≤0.05％,Zn≤0.05％,Ti≤0.03％,余量为Al。本发明制备的成品抗拉强度80-100Mpa,延伸率可达30％以上,高延伸,低强度,产品裂口率低,提高了产品的质量；具有优越的加工性能,极大的提高了产品的加工效率。(The invention discloses an aluminum foil for a high-elongation heat exchanger and a preparation method thereof, wherein the aluminum foil comprises the following components in percentage by mass: 0.6-0.7% of Si, 0.8-0.9% of Fe, 0.03-0.05% of Cu, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Zn, less than or equal to 0.03% of Ti and the balance of Al. The tensile strength of the finished product prepared by the method is 80-100Mpa, the elongation rate can reach more than 30%, the elongation is high, the strength is low, the split rate of the product is low, and the quality of the product is improved; has excellent processing performance and greatly improves the processing efficiency of products.)

1. The aluminum foil for the high-elongation heat exchanger is characterized by comprising the following components in percentage by mass: 0.6-0.7% of Si, 0.8-0.9% of Fe, 0.03-0.05% of Cu, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Zn, less than or equal to 0.03% of Ti and the balance of Al.

2. The preparation method of the aluminum foil for the high-elongation heat exchanger is characterized by comprising the following steps of:

(1) smelting 0.62 percent of Si, 0.86 percent of Fe, 0.035 percent of Cu and the balance of aluminum as basic components to prepare alloy raw materials;

(2) melting the raw materials, wherein the melting temperature is 730-760 ℃, performing melt refining treatment, pouring the melt into a standing furnace at 735-755 ℃, standing and preserving heat, wherein the temperature of the standing furnace is 720-750 ℃; then cast-rolling to obtain 6.0-7.0mm cast-rolled coils;

(3) roughly rolling the cast-rolled mother coil by 7.0-3.5-2.0 mm to roll the cast-rolled mother coil to the thickness of 2.0mm for intermediate annealing, heating to 265 ℃, preserving heat for 31h, cooling and discharging;

(4) after intermediate annealing, rolling the coil by 2.0-1.2-0.8-0.55 mm pass to be 0.55mm thick, and then cooling for 12h to carry out longitudinal shearing;

(5) the material roll after edge cutting is rolled to be 0.18 +/-0.009 mm thick in the finished product pass by 0.55-0.38-0.26-0.18 mm pass, and then is cut to be the finished product width;

(6) and annealing the finished product of the coil with the pass of 0.18 +/-0.009 mm, heating to 210 ℃ for 2 hours, preserving heat for 3 hours, continuously heating to 240 ℃, preserving heat for 21 hours, cooling and discharging.

Technical Field

The invention relates to an aluminum foil for a high-elongation heat exchanger and a preparation method thereof.

Background

The heat exchanger of the air conditioner is generally composed of aluminum foil fins and metal tubes. When the heat exchanger of the air conditioner is manufactured, the position of a reserved metal pipe is punched on an aluminum foil, and then the metal pipe penetrates through a hole and is tightly connected with an aluminum foil fin after being expanded. Under the existing technical condition, when the aluminum foil for the air conditioner is punched, cracks often appear, and the production efficiency is greatly influenced.

The invention relates to an aluminum foil for a high-elongation heat exchanger, which has the advantages that in the actual production process, the tensile strength of the original product is low, the elongation is not high, the cracking rate of the product is high, the product quality is greatly influenced, the product processing efficiency is low, and the product quality is poor.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an aluminum foil for a high-elongation heat exchanger and a preparation method thereof.

The aluminum foil for the high-elongation heat exchanger is characterized by comprising the following components in percentage by mass: 0.6-0.7% of Si, 0.8-0.9% of Fe0.03-0.05% of Cu0.03%, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Zn, less than or equal to 0.03% of Ti and the balance of Al.

The preparation method of the aluminum foil for the high-elongation heat exchanger is characterized by comprising the following steps of:

(1) smelting, namely preparing alloy raw materials by taking the mixture ratio of Si 0.62%, Fe0.86%, Cu0.035% and the balance of aluminum as basic components;

(2) melting the raw materials, wherein the melting temperature is 730-760 ℃, performing melt refining treatment, pouring the melt into a standing furnace at 735-755 ℃, standing and preserving heat, wherein the temperature of the standing furnace is 720-750 ℃; then cast-rolling to obtain 6.0-7.0mm cast-rolled coils;

(3) roughly rolling the cast-rolled mother coil by 7.0-3.5-2.0 mm to roll the cast-rolled mother coil to the thickness of 4.0mm for intermediate annealing, heating to 265 ℃, preserving heat for 31h, cooling and discharging;

(4) after intermediate annealing, rolling the coil by 2.0-1.2-0.8-0.55 mm pass to be 0.55mm thick, and then cooling for 12h to carry out longitudinal shearing;

(5) the material roll after edge cutting is rolled to be 0.18 +/-0.009 mm thick in the finished product pass by 0.55-0.38-0.26-0.18 mm pass, and then is cut to be the finished product width;

(6) and annealing the finished product of the coil with the pass of 0.18 +/-0.009 mm, heating to 210 ℃ for 2 hours, preserving heat for 3 hours, continuously heating to 240 ℃, preserving heat for 21 hours, cooling and discharging.

Has the advantages that:

under the existing technical condition, when the aluminum foil for the air conditioner is punched, cracks often appear, and the production efficiency is greatly influenced. Therefore, through continuous research, the aluminum foil for the heat exchanger with low strength and high elongation is produced, the tensile strength of a finished product is 80-100Mpa, the elongation rate can reach more than 30%, the high elongation and low strength have excellent processing performance, after the aluminum foil is used, the frequency of cracks of the product is greatly reduced, the production efficiency is improved, and the production quality is ensured.

Detailed Description

For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.

An aluminum foil for a high-elongation heat exchanger comprises the following components in percentage by mass: 0.6-0.7% of Si, 0.8-0.9% of Fe0.03-0.05% of Cu0.03%, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Zn, less than or equal to 0.03% of Ti and the balance of Al.

The preparation method of the aluminum foil for the high-elongation heat exchanger is characterized by comprising the following steps of:

(1) smelting, namely preparing alloy raw materials by taking the mixture ratio of Si 0.62%, Fe0.86%, Cu0.035% and the balance of aluminum as basic components;

(2) melting the raw materials, wherein the melting temperature is 730-760 ℃, performing melt refining treatment, pouring the melt into a standing furnace at 735-755 ℃, standing and preserving heat, wherein the temperature of the standing furnace is 720-750 ℃; then cast-rolling to obtain 6.0-7.0mm cast-rolled coils;

(3) roughly rolling the cast-rolled mother coil by 7.0-3.5-2.0 mm to roll the cast-rolled mother coil to the thickness of 4.0mm for intermediate annealing, heating to 265 ℃, preserving heat for 31h, cooling and discharging;

(4) after intermediate annealing, rolling the coil by 2.0-1.2-0.8-0.55 mm pass to be 0.55mm thick, and then cooling for 12h and then longitudinally shearing the edge;

(5) the material roll after edge cutting is rolled to be 0.18 +/-0.009 mm thick in the finished product pass by 0.55-0.38-0.26-0.18 mm pass, and then is cut to be the finished product width;

(6) and annealing the finished product of the coil with the pass of 0.18 +/-0.009 mm, heating to 210 ℃ for 2 hours, preserving heat for 3 hours, continuously heating to 240 ℃, preserving heat for 21 hours, cooling and discharging.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.