CN109355537B - 6-series aluminum alloy section for new energy battery tray and processing method thereof - Google Patents

6-series aluminum alloy section for new energy battery tray and processing method thereof Download PDF

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CN109355537B
CN109355537B CN201811531961.XA CN201811531961A CN109355537B CN 109355537 B CN109355537 B CN 109355537B CN 201811531961 A CN201811531961 A CN 201811531961A CN 109355537 B CN109355537 B CN 109355537B
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aluminum
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new energy
energy battery
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CN109355537A (en
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周芳坤
贺再林
肖孝未
李江峰
谢国军
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Hunan Hailv Automobile Industry Co ltd
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Hunan Hailv Automobile Industry Co ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/002Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent

Abstract

A6 series aluminum alloy section for a new energy battery tray and a processing method thereof are disclosed, wherein the 6 series aluminum alloy section comprises the following chemical components in percentage by weight: 0.65 to 0.70 percent of Si, 0.90 to 0.95 percent of Mg0.18 to 22 percent of Cu0.20 percent or less of Fe, less than 0.1 percent of Mn, 0.09 to 0.12 percent of Cr0, less than 0.01 percent of Zn, less than 0.1 percent of Ti and the balance of Al. The invention also discloses a processing method of the 6-series aluminum alloy section for the new energy battery tray. The 6-series aluminum alloy section for the new energy battery tray has the characteristics of high strength and toughness, high welding performance, corrosion resistance and fatigue resistance, and is suitable for the processing process of the new energy battery tray. Experiments prove that the hardness of the 6-series aluminum alloy section can reach 16.2-17.5 hw, the tensile strength is more than or equal to 290 MPa, the yield strength is more than or equal to 260 MPa, and the elongation is more than or equal to 10A 50 mm%.

Description

6-series aluminum alloy section for new energy battery tray and processing method thereof
Technical Field
The invention relates to the field of aluminum alloy processing, in particular to a 6-series aluminum alloy section for a new energy battery tray and a processing method thereof.
Background
At present, lightweight, low cost are the important direction of electric automobile development, and the requirement of new forms of energy battery material for tray is: high precision, good electrical performance, electrolyte resistance, flame retardance, stable long-term dimension, light weight, good mechanical performance and wide application range. In the past, new energy automobiles mostly adopt steel materials to manufacture power battery trays of electric automobiles, and the weight is higher. At present, many enterprises mainly use aluminum alloy materials as trays for power batteries of electric automobiles, the density of aluminum alloy is 2.7g/cm, and the aluminum alloy materials have obvious advantages in aspects such as compression, welding and the like; and the aluminum alloy becomes an optimal steel substitute material by virtue of high specific strength and high specific modulus, and the product weight can be greatly reduced on the premise of meeting the use requirement through reasonable layering and structural design.
At present, the battery aluminum tray mainly adopts 6 series aluminum profiles, has good plasticity and excellent corrosion resistance, particularly has no stress corrosion cracking tendency, and has good welding performance, so that the 6 series aluminum profiles are extremely suitable for the application of the project. However, high strength is required for the automotive battery tray, and thus high alloying of the aluminum bar alloy is required, which results in the 6-series aluminum profiles having reduced plasticity and corrosion resistance. In order to guarantee the product quality, advanced welding technologies such as friction stir welding and the like are needed to guarantee the product to be integrally formed. To date, there is no special alloy developed specifically for automotive pallets. Therefore, the research and development of the alloy with high comprehensive performance and the production method thereof, which are specially used for the automobile battery tray, are of great significance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a 6-series aluminum alloy section for a new energy battery tray, which has high strength and toughness, high welding performance, corrosion resistance and fatigue resistance, and can meet the requirements of automobile battery tray processing on materials.
The invention further aims to solve the technical problem of providing a processing method of the 6-series aluminum alloy section for the new energy battery tray, which can reduce the production cost, shorten the processing time and obtain high strength and toughness, high welding performance, corrosion resistance and fatigue resistance.
The technical scheme adopted for solving the technical problems is that the 6-series aluminum alloy section for the new energy battery tray comprises the following chemical components in percentage by total weight of the 6-series aluminum alloy section: 0.65 to 0.70 percent of Si, 0.90 to 0.95 percent of Mg0.18 to 22 percent of Cu0.20 percent or less of Fe, less than 0.1 percent of Mn, 0.09 to 0.12 percent of Cr0, less than 0.01 percent of Zn, less than 0.1 percent of Ti and the balance of Al.
The 6-series aluminum alloy section bar obtains high strength and toughness, high welding performance, corrosion resistance and fatigue resistance by adjusting elements of silicon, magnesium, copper and chromium, and can meet the requirements of high strength, corrosion resistance, good heat conduction and welding performance for new energy battery trays.
The invention further solves the technical problem by adopting the technical scheme that the processing method of the 6-series aluminum alloy section for the new energy battery tray comprises the following steps:
(1) heating and melting a raw material aluminum ingot to obtain aluminum liquid;
(2) removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by using the following chemical components: 0.65-0.70% of Si, 0.90-0.95% of Mg, 0.18-22% of Cu, less than or equal to 0.20% of Fe, less than 0.1% of Mn, 0.09-0.12% of Cr, less than 0.01% of Zn, less than 0.1% of Ti and the balance of Al, refining and standing the alloy element content in the aluminum liquid;
(3) filtering the aluminum liquid after standing, and then carrying out water cooling casting to obtain an aluminum bar;
(4) preheating an aluminum bar, then carrying out extrusion forming, and then carrying out water cooling to below 150 ℃ at a cooling speed of more than 14 ℃;
(5) and (4) reheating and preserving the heat of the cooled section, and naturally cooling to obtain the 6-series aluminum alloy section for the new energy battery tray.
According to the invention, the alloy element proportion and processing of the 6-series aluminum alloy section are adjusted, the internal grain structure is refined, the aluminum alloy casting effect with stable performance is formed, the high-temperature solid solution effect in the extrusion forming process is utilized, the online quenching and rapid cooling are carried out, the supersaturated solid solution is formed, the heating and heat preservation aging is carried out again, the internal strengthening phase magnesium disilicide is uniformly separated out, and the aluminum alloy material which meets the requirements of high strength, corrosion resistance, heat conduction and good welding performance for a new energy battery tray can be produced.
Further, in the step (1), the melting temperature is 720-750 ℃.
Further, in the step (3), the water cooling conditions include: the temperature of the water is less than 50 ℃, and the cooling time is 0.5-1.5 h.
Further, in the step (3), the diameter of the aluminum rod is 152-188 mm.
Further, in the step (4), the preheating conditions include: the preheating conditions include: the preheating temperature is 500-530 ℃, and the preheating time is 2-4 hours.
Further, in the step (4), the extrusion molding conditions include: the extrusion speed is 5-10m/min, and the temperature of the discharge port is 510-540 ℃.
In the step (4) of the invention, water cooling is carried out by utilizing the high-temperature solid solution effect in the extrusion forming process, and then the temperature is rapidly cooled to be below 150 ℃ by the water cooling mode of a cooling system.
Further, in the step (5), the incubation conditions include: the temperature is 175 ℃ and 180 ℃ and the time is 7-8 h.
The technical scheme adopted for further solving the technical problems is that the 6-series aluminum alloy section for the new energy battery tray prepared by the processing method has high strength and toughness, high welding performance, corrosion resistance and fatigue resistance, and can meet the requirements of automobile battery tray processing on materials.
Compared with the prior art, the 6-series aluminum alloy section for the new energy battery tray has the characteristics of high strength and toughness, high welding performance, corrosion resistance and fatigue resistance, and is suitable for the processing process of the new energy battery tray. Experiments prove that the hardness of the 6-series aluminum alloy section can reach 16.2-17.5 hw, the tensile strength is more than or equal to 290 MPa, the yield strength is more than or equal to 260 MPa, and the elongation is more than or equal to 10A 50 mm%.
Detailed Description
The present invention will be described in detail below by way of examples. In the following examples of the present invention,
the Vickers hardness passes the first part of the Vickers hardness test of GB/T62660.1-2016 metal materials: testing by a test method;
the tensile strength is measured by a sample and a method for a tensile test of GB/T16865-2013 wrought aluminum, magnesium and alloy processing products thereof;
the yield strength passes the first part of the Vickers hardness test of GB/T62660.1-2016 metal materials: testing by a test method;
the elongation is measured by a sample and a method for a tensile test of GB/T16865-2013 wrought aluminum, magnesium and alloy processing products thereof;
the welding mode of friction stir welding is adopted, and the performance after welding is measured by a GB/T2651-2008 welding joint tensile test method.
In the case where no particular mention is made, commercially available products are used as the starting materials.
Example 1
The processing method of the 6-series aluminum alloy section for the new energy battery tray comprises the following steps:
(1) heating a raw material aluminum ingot to 730 ℃ for melting to obtain aluminum liquid;
(2) removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by using the following chemical components: 0.65% of Si, 0.92% of Mg, 0.20% of Cu, 0.15% of Fe, 0.05% of Mn, 0.10% of Cr, 0.003% of Zn, 0.05% of Ti and the balance of Al, and refining and standing the alloy elements in the molten aluminum;
(3) filtering the aluminum liquid after standing, and then carrying out casting when cooling the aluminum liquid with water at the temperature of 23 ℃ for 60min to obtain an aluminum bar with the diameter of 152 mm;
(4) preheating an aluminum bar at 510 ℃ for 3 hours, then carrying out extrusion forming at an extrusion speed of 10m/min and a discharge port temperature of 520 ℃, and rapidly cooling the aluminum bar to below 150 ℃ through a cooling system at a cooling speed of 20 ℃/s by utilizing a high-temperature solid solution effect in the extrusion forming process;
(5) and heating the cooled section to 180 ℃, preserving the heat for 7 hours, and naturally cooling to obtain the 6-series aluminum alloy section for the new energy battery tray.
Example 2
The processing method of the 6-series aluminum alloy section for the new energy battery tray comprises the following steps:
(1) heating a raw material aluminum ingot to 720 ℃ for melting to obtain aluminum liquid;
(2) removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by using the following chemical components: 0.68 percent of Si, 0.90 percent of Mg, 0.22 percent of Cu, 0.20 percent of Fe, 0.03 percent of Mn, 0.09 percent of Cr, 0.008 percent of Zn, 0.03 percent of Ti and the balance of Al, and refining and standing the alloy elements in the aluminum liquid;
(3) filtering the aluminum liquid after standing, and then carrying out casting when cooling the aluminum liquid with water at the temperature of 26 ℃ for 62min to obtain an aluminum bar with the diameter of 152 mm;
(4) preheating an aluminum bar at 520 ℃ for 2.5 hours, carrying out extrusion forming at the extrusion speed of 8m/min and the discharge port temperature of 530 ℃, and rapidly cooling the aluminum bar to below 150 ℃ through a cooling system at the water cooling speed of 16 ℃/S by utilizing the high-temperature solid solution effect in the extrusion forming process;
(5) and heating the cooled section to 175 ℃, preserving the heat for 8 hours, and naturally cooling to obtain the 6-series aluminum alloy section for the new energy battery tray.
Example 3
The processing method of the 6-series aluminum alloy section for the new energy battery tray comprises the following steps:
(1) heating a raw material aluminum ingot to 740 ℃ for melting to obtain aluminum liquid;
(2) removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by using the following chemical components: 0.66 percent of Si, 0.94 percent of Mg, 0.21 percent of Cu, 0.18 percent of Fe, 0.08 percent of Mn, 0.11 percent of Cr, 0.001 percent of Zn, 0.08 percent of Ti and the balance of Al, and refining and standing the alloy elements in the aluminum liquid;
(3) filtering the aluminum liquid after standing, and then carrying out casting when cooling the aluminum liquid with water at the temperature of 24 ℃ for 60min to obtain an aluminum bar with the diameter of 152 mm;
(4) preheating an aluminum bar for 4 hours at the temperature of 500 ℃, carrying out extrusion forming at the extrusion speed of 5m/min and the discharge port temperature of 520 ℃, and rapidly cooling the aluminum bar to below 150 ℃ through a cooling system at the cooling speed of 25 ℃/S by utilizing the high-temperature solid solution effect in the extrusion forming process;
(5) and heating the cooled section to 178 ℃, preserving the heat for 7.5 hours, and naturally cooling to obtain the 6-series aluminum alloy section for the new energy battery tray.
Example 4
The processing method of the 6-series aluminum alloy section for the new energy battery tray comprises the following steps:
(1) heating a raw material aluminum ingot to 750 ℃ for melting to obtain aluminum liquid;
(2) removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by using the following chemical components: 0.70% of Si, 0.95% of Mg, 0.18% of Cu, 0.12% of Fe, 0.04% of Mn, 0.12% of Cr0.12% of Zn, 0.008% of Ti0.07% of Ti and the balance of Al, refining and standing;
(3) filtering the aluminum liquid after standing, and then carrying out casting when cooling the aluminum liquid with water at the temperature of 24 ℃ for 64min to obtain an aluminum bar with the diameter of 188 mm;
(4) preheating an aluminum bar at 530 ℃ for 2 hours, extruding and forming at the extrusion speed of 6m/min and the discharge port temperature of 540 ℃, and rapidly cooling the aluminum bar to below 150 ℃ at the cooling speed of 22 ℃/S through a cooling system by utilizing the high-temperature solid solution effect in the extrusion and forming process;
(5) and heating the cooled section to 180 ℃, preserving the heat for 7 hours, and naturally cooling to obtain the 6-series aluminum alloy section for the new energy battery tray.
Comparative example 1
A 6-series aluminum alloy profile for a new energy battery tray was processed according to the method of example 1, except that in the step (2), 6063T6 modified the chemical composition of the aluminum alloy: 0.75% of Si, 0.8% of Mg, 0.85% of Cu, 0.20% of Fe0.15%, 0.02% of Mn, 0.05% of Zn, 0.07% of Ti and the balance of Al.
Comparative example 2
The method for processing the 6-series aluminum alloy section for the new energy battery tray comprises the following steps of (1) processing a 6-series aluminum alloy section for the new energy battery tray, wherein in the step (4), an aluminum bar is placed into a resistance heating furnace to be heated to 510 ℃ and kept warm for 12 hours, taken out of the furnace and naturally cooled in the air, then the aluminum bar is heated to 480 ℃ and kept warm for 4 hours, then extrusion processing is carried out (the preheating temperature of an extrusion cylinder is 400 ℃), a product is extruded out of a die opening and then water mist quenching is carried out, and the product is rapidly cooled to below 150 ℃ at a cooling speed.
Test example
The hardness, tensile strength, yield strength, elongation and tensile strength after welding of the 6-series aluminum alloy sections for new energy battery trays processed in examples 1 to 4 and comparative example 1 were measured. The measurement results are shown in Table 1.
TABLE 1
The results in Table 1 show that the hardness of the 6-series aluminum alloy sections for the new energy battery trays, which are processed in the examples 1 to 4, can reach 17.2 to 17.7hw, the tensile strength is greater than or equal to 298MPa, the yield strength is greater than or equal to 262MPa, the elongation is greater than or equal to 10.7A50mm%, and the tensile strength after welding is greater than or equal to 240 MPa.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (8)

1. The 6-series aluminum alloy profile for the new energy battery tray is characterized by comprising the following chemical components in percentage by weight based on the total weight of the 6-series aluminum alloy profile: 0.65 to 0.70 percent of Si, 0.90 to 0.95 percent of Mg0.18 to 0.22 percent of Cu0.20 percent of Fe, less than 0.1 percent of Mn, 0.09 to 0.12 percent of Cr0, less than 0.01 percent of Zn, less than 0.1 percent of Ti and the balance of Al; the processing method of the 6-series aluminum alloy section for the new energy battery tray comprises the following steps:
(1) heating and melting a raw material aluminum ingot to obtain aluminum liquid;
(2) removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by using the following chemical components: 0.65 to 0.70 percent of Si, 0.90 to 0.95 percent of Mg, 0.18 to 0.22 percent of Cu, less than or equal to 0.20 percent of Fe, less than 0.1 percent of Mn, 0.09 to 0.12 percent of Cr, less than 0.01 percent of Zn, less than 0.1 percent of Ti and the balance of Al, refining and standing the alloy elements in the aluminum liquid;
(3) filtering the aluminum liquid after standing, and then carrying out water cooling casting to obtain an aluminum bar;
(4) preheating an aluminum bar, then carrying out extrusion forming, and then carrying out water cooling at a cooling speed of more than 14 ℃/s to below 50 ℃; the preheating conditions include: the preheating temperature is 500-530 ℃, and the preheating time is 2-4 hours;
(5) and (4) reheating and preserving the heat of the cooled section, and naturally cooling to obtain the 6-series aluminum alloy section for the new energy battery tray.
2. A processing method of a 6-series aluminum alloy section for a new energy battery tray is characterized by comprising the following steps:
(1) heating and melting a raw material aluminum ingot to obtain aluminum liquid;
(2) removing dross on the surface of the aluminum liquid, and preparing the aluminum liquid by using the following chemical components: 0.65 to 0.70 percent of Si, 0.90 to 0.95 percent of Mg, 0.18 to 0.22 percent of Cu, less than or equal to 0.20 percent of Fe, less than 0.1 percent of Mn, 0.09 to 0.12 percent of Cr, less than 0.01 percent of Zn, less than 0.1 percent of Ti and the balance of Al, refining and standing the alloy elements in the aluminum liquid;
(3) filtering the aluminum liquid after standing, and then carrying out water cooling casting to obtain an aluminum bar;
(4) preheating an aluminum bar, then carrying out extrusion forming, and then carrying out water cooling at a cooling speed of more than 14 ℃/s to below 50 ℃; the preheating conditions include: the preheating temperature is 500-530 ℃, and the preheating time is 2-4 hours;
(5) and (4) reheating and preserving the heat of the cooled section, and naturally cooling to obtain the 6-series aluminum alloy section for the new energy battery tray.
3. The process of claim 2, wherein in step (1), the melting temperature is 720-750 ℃.
4. The process of claim 2, wherein in step (3), the water cooling conditions comprise: the temperature of the water is less than 50 ℃, and the cooling time is 0.5-1.5 h.
5. The processing method as claimed in claim 2, wherein in the step (3), the diameter of the aluminum rod is 152-188 mm.
6. The process according to any one of claims 2 to 5, wherein in the step (4), the extrusion molding conditions include: the extrusion speed is 5-10m/min, and the temperature of the discharge port is 510-540 ℃.
7. The process according to any one of claims 2 to 5, wherein in step (5), the conditions of the incubation comprise: the temperature is 175 ℃ and 180 ℃ and the time is 7-8 h.
8. 6-series aluminum alloy section bar for new energy battery trays, prepared by the processing method according to any one of claims 3 to 7.
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CN111020251B (en) * 2019-12-20 2020-12-08 营口忠旺铝业有限公司 Production process of high-strength 6-series aluminum alloy section
CN111778431A (en) * 2020-07-02 2020-10-16 苏州阿罗米科技有限公司 High-toughness single-walled carbon nanotube aluminum alloy-based composite material and preparation method thereof
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CN112226657A (en) * 2020-09-28 2021-01-15 广东坚美铝型材厂(集团)有限公司 Preparation method of motor shell aluminum profile, motor shell and motor
CN112375945A (en) * 2020-10-23 2021-02-19 江阴中奕达轻合金科技有限公司 6061 alloy aluminum profile for extruding new energy automobile battery tray and processing technology thereof

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