阅读说明：本技术 一种高强高延展性复合板材料及其加工工艺 (High-strength high-ductility composite board material and processing technology thereof ) 是由 曹晓国 曹旷 *** 于 2020-07-09 设计创作，主要内容包括：本发明涉及一种高强高延展性复合板材料的加工工艺,多层复合材料由钎焊层和芯层组成,所述钎焊层采用的是A4045铝合金,在钎焊时起到最先熔化并铺展后焊接的作用,所述芯层是3003Mod铝合金,其熔点高于钎焊层材料65℃,钎焊时具有一定的强度,且不会熔化,起到维持整个材料基体强度的作用,加工工艺流程包括步骤：熔铸、锯切、均热、铣面、复合、加热、热轧、冷轧、退火、分切,用该方法制备的水箱主板用高强高延展多层复合材料,与传统的材料相比,具有更好的更高的强度、更好的延展性,可广泛应用于汽车水箱等领域。(The invention relates to a processing technology of a high-strength high-ductility composite board material, wherein a multi-layer composite material consists of a brazing layer and a core layer, the brazing layer adopts A4045 aluminum alloy and plays a role of melting firstly, spreading and then welding in brazing, the core layer is 3003Mod aluminum alloy, the melting point of the core layer is higher than 65 ℃ of the brazing layer material, the core layer has certain strength in brazing and can not be melted, and the function of maintaining the strength of the whole material matrix is achieved, and the processing technological process comprises the following steps: the high-strength high-ductility multilayer composite material for the water tank main board prepared by the method has better higher strength and better ductility compared with the traditional material, and can be widely applied to the fields of automobile water tanks and the like.)

1. A high-strength high-ductility composite board material is characterized in that: the brazing layer is composed of A4045 aluminum alloy, the thickness ratio of the brazing layer to the whole material is 6 +/-1.5%, and the core layer is composed of 3003Mod aluminum alloy.

2. A high strength and high ductility composite plate material as claimed in claim 1, wherein: the brazing layer comprises the following materials: 9.0 to 11.0 percent of Si-, less than or equal to 0.3 percent of Fe-, less than or equal to 0.15 percent of Cu-, less than or equal to 0.05 percent of Mn-, less than or equal to 0.03 percent of Mg-, less than or equal to 0.1 percent of Zn-, and the balance of Al.

3. A high strength and high ductility composite plate material as claimed in claim 1, wherein: the core layer comprises the following materials: si-less than or equal to 0.2 percent, Fe-0.15-0.32 percent, Cu-0.5-0.8 percent, Mn-1.4-2.3 percent, Mg-less than or equal to 0.1 percent, Zn-less than or equal to 0.2 percent, Ti-less than or equal to 0.05 percent, Zr-0.05-0.2 percent and the balance of Al.

4. A processing technology of the high-strength high-ductility composite board material in the claim 1 comprises the following specific steps:

step 1: carrying out material component ratio of the brazing layer and the core layer;

step 2: a smelting process: the brazing layer 4045 is added with Si blocks at the melting temperature of 750-760 ℃, stirred for 20-30 minutes, and then added with aluminum ingots to be cooled to 740-750 ℃; refining and slagging off;

the core layer 3003Mod is smelted at the temperature of 760-780 ℃, Cu and Mn intermediate alloy is added, the mixture is stirred for 20-30 minutes, then aluminum ingots are added, the temperature is reduced to 750-760 ℃, and the mixture is refined and slag is removed;

and step 3: refining degassing: after the components of the alloy are qualified, refining by adopting argon for 20-25 minutes at the refining temperature of 750-760 ℃, and detecting that the hydrogen content of the liquid aluminum alloy is not higher than 0.15 ml/100 gAl;

and 4, step 4: a filtering process: filtering by adopting a 30PPi +40PPi double-stage ceramic filter plate;

and 5: a casting procedure: performing the process according to the casting temperature of 680-710 ℃, the casting speed of 45-55mm/min, the water pressure of 0.1-0.2Mpa and the water temperature of less than or equal to 30 ℃ to obtain a flat ingot meeting the internal control standard;

step 6: a sawing procedure: the sawing length of the ingot casting gate part is 150 mm and 200 mm;

and 7: a soaking process: carrying out ingot casting soaking treatment by adopting a process of 600-;

and 8: a face milling procedure: the milling amount of the large surface of the cast ingot is 10-12mm per surface;

and step 9: a compounding procedure: polishing the contact surface of the brazing layer and the core layer, cleaning two large surfaces of the core layer, stacking the two large surfaces in sequence, and bundling the two large surfaces by using a steel belt;

step 10: a hot rolling procedure: hot rolling, bonding and rolling the 445mm thick cast ingot obtained in the above steps to obtain an aluminum coil with the thickness of 5-7 mm;

step 11: a cold rolling procedure: cold rolling the coil obtained by the hot rolling by using a proper cold working rate until the thickness of the coil is 1.3-1.8 mm;

step 12: an annealing process;

step 13: and (5) cutting.

5. The processing technology of the high-strength high-ductility composite board according to claim 4, is characterized in that: the finishing temperature of the hot rolling process of the step 10 is 300 ℃ to 340 ℃.

6. The processing technology of the high-strength high-ductility composite board according to claim 4, is characterized in that: annealing step 12: and (3) carrying out roll annealing by adopting an annealing process of annealing the finished product at the metal temperature of 405 +/-3 ℃ for 1.5 hours, protecting by using nitrogen, and sending the aluminum roll with the preset thickness into the annealing furnace for annealing the finished product.

7. The processing technology of the high-strength high-ductility composite board according to claim 4, is characterized in that: and step 13, in the slitting process, thick longitudinal scissors are used for shearing, and the height of burrs is controlled within 50 microns.

8. The processing technology of the high-strength high-ductility composite board according to claim 7, is characterized in that: and (3) obtaining a qualified composite aluminum strip through precision slitting, wherein the thickness of a brazing layer in the composite aluminum strip accounts for 4.5-7.5% of the total thickness, and the final delivery state of the material is in an O state.

Technical Field

The invention relates to the technical field of automobile heat exchange materials, in particular to a high-strength high-ductility composite plate material and a processing technology thereof.

Background

In recent years, the light weight of vehicles such as automobiles and the like becomes an important item for strategic development of the manufacturing industry in China, the light weight heat transfer aluminum alloy composite material has the strategic significance of driving the global development of the manufacturing industry in China and realizing the modernization and high technology of the manufacturing industry, the weight of an automobile is reduced by 10 percent, the oil consumption can be reduced by 6 to 8 percent, the fuel efficiency is improved by 5 to 8 percent, the oil consumption can be reduced by 0.7L every 100 kilograms, the weight reduction and the energy saving are key technical problems which must be solved in the development process of the automobile industry, the heat transfer aluminum alloy composite material has wide application market in the field of automobile cooling systems (automobile water tanks and fan heaters), the light weight, high strength, corrosion resistance and thickness reduction of the heat transfer aluminum alloy composite material have great relation to the weight reduction and the energy saving and emission reduction of the automobile, different cooling media have great influence on the service life of the material, and simultaneously, the processing, however, the existing materials for the water tank main plate have the problems of insufficient strength and ductility after brazing, and therefore a high-strength high-ductility composite plate material and a processing technology thereof need to be designed to solve the problems.

Disclosure of Invention

The invention aims to provide a high-strength high-ductility composite board material and a processing technology thereof aiming at the problems of insufficient strength and ductility after brazing of a water tank main board at present, and the specific technical scheme is as follows:

the high-strength high-ductility composite board material sequentially comprises a brazing layer and a core layer, wherein the brazing layer is composed of A4045 aluminum alloy, the thickness ratio of the brazing layer to the whole material is 6 +/-1.5%, and the core layer is composed of 3003Mod aluminum alloy.

The invention is further improved in that: the brazing layer comprises the following materials: 9.0 to 11.0 percent of Si-, less than or equal to 0.3 percent of Fe-, less than or equal to 0.15 percent of Cu-, less than or equal to 0.05 percent of Mn-, less than or equal to 0.03 percent of Mg-, less than or equal to 0.1 percent of Zn-, and the balance of Al.

The invention is further improved in that: the core layer comprises the following materials: si-less than or equal to 0.2 percent, Fe-0.15-0.32 percent, Cu-0.5-0.8 percent, Mn-1.4-2.3 percent, Mg-less than or equal to 0.1 percent, Zn-less than or equal to 0.2 percent, Ti-less than or equal to 0.05 percent, Zr-0.05-0.2 percent and the balance of Al.

The invention is further improved in that: the method comprises the following specific steps:

step 1: carrying out material component ratio of the brazing layer and the core layer;

step 2: a smelting process: the brazing layer 4045 is added with Si blocks at the melting temperature of 750-760 ℃, stirred for 20-30 minutes, and then added with aluminum ingots to be cooled to 740-750 ℃; refining and slagging off; the core layer 3003Mod is smelted at the temperature of 760-780 ℃, Cu and Mn intermediate alloy is added, the mixture is stirred for 20-30 minutes, then aluminum ingots are added, the temperature is reduced to 750-760 ℃, and the mixture is refined and slag is removed; and step 3: refining degassing: after the components of the alloy are qualified, refining by adopting argon for 20-25 minutes at the refining temperature of 750-760 ℃, and detecting that the hydrogen content of the liquid aluminum alloy is not higher than 0.15 ml/100 gAl; and 4, step 4: a filtering process: filtering by adopting a 30PPi +40PPi double-stage ceramic filter plate; and 5: a casting procedure: performing the process according to the casting temperature of 680-710 ℃, the casting speed of 45-55mm/min, the water pressure of 0.1-0.2Mpa and the water temperature of less than or equal to 30 ℃ to obtain a flat ingot meeting the internal control standard; step 6: a sawing procedure: the sawing length of the ingot casting gate part is 150 mm and 200 mm; and 7: a soaking process: carrying out ingot casting soaking treatment by adopting a process of 600-; and 8: a face milling procedure: the milling amount of the large surface of the cast ingot is 10-12mm per surface; and step 9: a compounding procedure: polishing the contact surface of the brazing layer and the core layer, cleaning two large surfaces of the core layer, stacking the two large surfaces in sequence, and bundling the two large surfaces by using a steel belt; step 10: a hot rolling procedure: hot rolling, bonding and rolling the 445mm thick cast ingot obtained in the above steps to obtain an aluminum coil with the thickness of 5-7 mm; step 11: a cold rolling procedure: cold rolling the coil obtained by the hot rolling by using a proper cold working rate until the thickness of the coil is 1.3-1.8 mm; step 12: an annealing process; step 13: and (5) cutting.

The invention is further improved in that: the finishing temperature of the hot rolling process of the step 10 is 300 ℃ to 340 ℃.

The invention is further improved in that: annealing step 12: and (3) carrying out roll annealing by adopting an annealing process of annealing the finished product at the metal temperature of 405 +/-3 ℃ for 1.5 hours, protecting by using nitrogen, and sending the aluminum roll with the preset thickness into the annealing furnace for annealing the finished product.

The invention is further improved in that: and step 13, in the slitting process, thick longitudinal scissors are used for shearing, and the height of burrs is controlled within 50 microns.

The invention is further improved in that: and (3) obtaining a qualified composite aluminum strip through precision slitting, wherein the thickness of a brazing layer in the composite aluminum strip accounts for 4.5-7.5% of the total thickness, and the final delivery state of the material is in an O state.

The invention has the beneficial effects that:

the high-strength high-ductility multilayer composite material of the invention improves the strength and ductility, reduces the thickness by 20 percent compared with the thickness of the common pipe material, plays a decisive role in reducing the weight of the water tank, saves the material cost for customers, achieves the design purpose through batch production, meanwhile, the preparation method of the high-strength corrosion-resistant composite aluminum alloy material comprises the steps of selecting inner and outer layer alloy components which are matched with each other, preparing a core material ingot and a skin material ingot by adopting a semi-continuous casting method, wherein the skin material ingot is a brazing layer, sawing, milling, heating, hot rolling and slicing the skin material ingot to obtain the required skin material, and then compounding the alloy with a milled core ingot, and performing hot rolling, cold rolling, annealing and cutting on the compounded ingot to obtain a material meeting the requirements.

Detailed Description