Extrusion forming process for battery box made of 3003 material

Abstract

The invention discloses an extrusion forming process for a battery box made of a 3003 material, and belongs to the technical field of battery box processing. Comprising the following steps that raw materials including 0.04%-0.1% of S i, 0.17%-0.2% of Fe, 0.05%-0.2% of Cu, 1%-1.5% of Mn, 0.03%-0.1% of Zn, smaller than or equal to 0.05% of other single elements, smaller than or equal to 0.15% of other impurity elements in total and the balance A are prepared and cast into a cast rod; performing homogenizing treatment, torsional deformation, quenching, aging treatment and extrusion forming to obtain a plate; and further processing to obtain the battery box. The parameters of the extrusion forming process are as follows: the heating temperature of an extrusion die is 450-470 DEG C, the heat preservation time is 10-12 hours, the heating temperature of an extrusion container is 400-420 DEG C, and the extrusion speed is 5-10 m / min; and the 3003 material battery box with excellent processing performance is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of battery box processing, and particularly relates to an extrusion forming process for a battery box made of 3003 material. Background Art

[0002] With the development of the economy, in order to build a green ecological environment and reduce carbon emissions, new energy vehicle profiles have emerged, and diversified products have been continuously presented. In particular, the extruded aluminum alloy profiles made of 3003 material have relatively high strength. After being processed, the strength of this alloy is relatively high, enabling it to withstand greater forces in many applications. Whether in the fields of aerospace, automotive manufacturing, construction or others, secondly, the 3003 alloy aluminum profiles also have good corrosion resistance and have been widely used in the automotive field. However, the plasticity of the 3003 material alloy is relatively low, and problems such as cracks and deformation are likely to occur during the processing, which affects the forming quality and service life of the battery box. Summary of the Invention

[0003] The purpose of the present invention is to provide an extrusion forming process for a battery box made of 3003 material, which is used to solve the problems that the plasticity of the 3003 material alloy is relatively low and cracks and deformation are likely to occur during the processing in the prior art.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] An extrusion forming process for a battery box made of 3003 material includes the following steps:

[0006] S1. Prepare raw materials according to the alloy element composition and melt them into ingots. By mass percentage, the alloy element composition includes: Si: 0.04 - 0.1%, Fe: 0.17 - 0.2%, Cu: 0.05 - 0.2%, Mn: 1 - 1.5%, Zn: 0.03 - 0.1%, other single elements ≤ 0.05%, the total of other impurity elements ≤ 0.15%, and Al: the balance;

[0007] S2. Homogenize, twist and deform, perform online quenching, aging treatment on the ingots in sequence, and then introduce them into an extrusion die for extrusion forming to obtain sheets;

[0008] S3. Stretch and straighten the sheets, bend them according to specifications, weld, polish, spray, perform quality inspection, and package them to obtain the battery box;

[0009] The extrusion forming process parameters are as follows:

[0010] The heating temperature of the extrusion die is 450 - 470°C, the holding time is 10 - 12 h, the heating temperature of the extrusion cylinder is 400 - 420°C, and the extrusion speed is 5 - 10 m / min.

[0011] As a further solution of the present invention, by mass percentage, the alloy element composition includes: Si: 0.04%, Fe: 0.17%, Cu: 0.11%, Mn: 1.21%, Zn: 0.03%, other single elements ≤ 0.05%, the total of other impurity elements ≤ 0.15%, and Al: the balance.

[0012] As a further solution of the present invention, the homogenization means that the cast rod is kept at 465 - 475 °C for 20 - 30 h and then naturally cooled to room temperature.

[0013] As a further solution of the present invention, the torsional deformation means that torsion is carried out between the upper and lower dies of a 250 t - class high - pressure torsion device, the working pressure is 5 GPa, the rotation speed is 1 r / min, the high - pressure torsion temperature is room temperature, and the number of high - pressure torsion revolutions is 2 - 5 r respectively.

[0014] As a further solution of the present invention, the drawing straightening rate is 0.5 - 2.0%.

[0015] As a further solution of the present invention, the temperature of the aging treatment is 175 °C and the time is 30 - 50 min.

[0016] As a further solution of the present invention, the quenching temperature is 480 - 520 °C.

[0017] The battery box made of 3003 material by using the above - mentioned battery box extrusion forming process for 3003 material.

[0018] The beneficial effects of the present invention:

[0019] In the extrusion forming process of a battery box made of 3003 material disclosed by the present invention, through high - pressure torsion, the grains tend to become equiaxed crystals, further refining the microstructure. A large number of short rod - shaped iron - rich phases are observed to be diffusely distributed inside the battery box, and their sizes are small. During the extrusion process of the cast rod, there is intense friction with the extrusion cylinder and the die. After extrusion deformation processing, a large number of massive Al - Fe - Mn crystal phases are broken and discretely distributed in the matrix. In addition, the Mn element dissolved in the Al matrix will precipitate in the form of a dispersed phase during the extrusion process, improving the degree of homogenization and enhancing the plasticity of the alloy. Brief Description of the Drawings

[0020] The present invention will be further described below with reference to the drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the battery box obtained in Example 1 of the present invention;

[0022] Figure 2 It is a schematic diagram of the grain morphology of the longitudinal section of the battery box obtained in Example 1 of the present invention;

[0023] Figure 3 It is a SEM schematic diagram of the battery box obtained in Embodiment 1 of the present invention. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1

[0026] An extrusion molding process for a battery box made of 3003 material, comprising the following steps:

[0027] S1. Prepare raw materials according to the alloy element composition and melt them into a cast rod. By mass percentage, the alloy element composition includes: Si: 0.04%, Fe: 0.17%, Cu: 0.11%, Mn: 1.21%, Zn: 0.03%, other single elements ≤ 0.05%, other impurity elements in total ≤ 0.15%, Al: the balance;

[0028] S2. Perform homogenization treatment, torsion deformation, online quenching, aging treatment on the cast rod in sequence, and introduce it into an extrusion die for extrusion molding to obtain a sheet;

[0029] S3. Perform stretch straightening, bending according to specifications, welding, grinding, spraying, quality inspection, and packaging on the sheet to obtain the battery box;

[0030] The extrusion molding process parameters are as follows:

[0031] The heating temperature of the extrusion die is 460 °C, the holding time is 11 h, the heating temperature of the extrusion cylinder is 410 °C, and the extrusion speed is 8 m / min.

[0032] The homogenization means holding the cast rod at 470 °C for 25 h and naturally cooling it to room temperature.

[0033] The torsion deformation means performing torsion between the upper and lower dies of high-pressure torsion of a 250t-level high-pressure torsion device, with a working pressure of 5 GPa, a rotation speed of 1 r / min, a high-pressure torsion temperature of room temperature, and the number of high-pressure torsion revolutions being 3 r respectively.

[0034] The stretch rate of the stretch straightening is 1%.

[0035] The temperature of the aging treatment is 175 °C and the time is 40 min.

[0036] The quenching temperature is 500 °C.

[0037] As Figures 1-3 shown, through high-pressure torsion, the grains tend to become equiaxed grains, further refining the microstructure. A large number of short rod-shaped iron-rich phases are observed to be diffusely distributed inside the battery case, with small sizes. During the extrusion process of the cast rod, there is intense friction with the extrusion cylinder and the die. After extrusion deformation processing, a large number of massive Al-Fe-Mn crystal phases are broken and discretely distributed in the matrix. In addition, the Mn element dissolved in the Al matrix will precipitate in the form of a dispersed phase during the extrusion process, improving the homogenization degree and enhancing the plasticity of the alloy.

[0038] Example 2

[0039] An extrusion forming process for a battery case made of 3003 material, comprising the following steps:

[0040] S1. Prepare raw materials according to the alloy element composition and melt them into a cast rod. By mass percentage, the alloy element composition includes: Si: 0.08%, Fe: 0.185%, Cu: 0.05%, Mn: 1%, Zn: 0.06%, other single elements ≤ 0.05%, total other impurity elements ≤ 0.15%, Al: the balance;

[0041] S2. Homogenize the cast rod, perform torsional deformation, on-line quenching, aging treatment in sequence, and then feed it into an extrusion die for extrusion forming to obtain a sheet;

[0042] S3. Perform stretch straightening on the sheet, bend it according to specifications, weld, grind, spray, perform quality inspection, and package to obtain the battery case;

[0043] The extrusion forming process parameters are as follows:

[0044] The heating temperature of the extrusion die is 450 °C, the holding time is 10 h, the heating temperature of the extrusion cylinder is 400 °C, and the extrusion speed is 5 m / min.

[0045] The homogenization refers to holding the cast rod at 465 °C for 20 h and then naturally cooling it to room temperature.

[0046] The torsional deformation refers to performing torsion between the upper and lower dies of high-pressure torsion on a 250 t-class high-pressure torsion device, with a working pressure of 5 GPa, a rotation speed of 1 r / min, a high-pressure torsion temperature of room temperature, and the number of high-pressure torsion revolutions being 2 r respectively.

[0047] The stretch rate of the stretch straightening is 0.5%.

[0048] The temperature of the aging treatment is 175 °C and the time is 30 min.

[0049] The quenching temperature is 480 °C.

[0050] Example 3

[0051] An extrusion molding process for a battery case made of 3003 material, comprising the following steps:

[0052] S1. Prepare raw materials according to the alloy element composition and melt them into a casting rod. By mass percentage, the alloy element composition includes: Si: 0.1%, Fe: 0.2%, Cu: 0.2%, Mn: 1.5%, Zn: 0.1%, other single elements ≤ 0.05%, total other impurity elements ≤ 0.15%, Al: the balance;

[0053] S2. Homogenize, twist, perform on-line quenching, aging treatment on the casting rod in sequence, and then introduce it into an extrusion die for extrusion molding to obtain a sheet;

[0054] S3. Stretch and straighten the sheet, bend it according to specifications, weld, grind, spray, perform quality inspection, and package it to obtain the battery case;

[0055] The extrusion molding process parameters are as follows:

[0056] The heating temperature of the extrusion die is 470 °C, the heat preservation time is 12 h, the heating temperature of the extrusion cylinder is 420 °C, and the extrusion speed is 10 m / min.

[0057] The homogenization means keeping the casting rod at 475 °C for 30 h and naturally cooling it to room temperature.

[0058] The twist deformation means twisting between the upper and lower dies of high-pressure torsion of a 250 t-class high-pressure torsion equipment, with a working pressure of 5 GPa, a rotation speed of 1 r / min, a high-pressure torsion temperature of room temperature, and the number of high-pressure torsion revolutions being 5 r respectively.

[0059] The stretching rate of the stretch straightening is 2.0%.

[0060] The temperature of the aging treatment is 175 °C and the time is 50 min.

[0061] The quenching temperature is 520 °C.

[0062] Comparative Example 1

[0063] The difference from Example 1 is that raw materials are prepared according to the alloy element composition and melted into a casting rod. By mass percentage, the alloy element composition includes: Fe: 0.17%, Cu: 0.11%, Mn: 1.21%, Zn: 0.03%, other single elements ≤ 0.05%, total other impurity elements ≤ 0.15%, Al: the balance.

[0064] Comparative Example 2

[0065] The difference from Example 1 is that the raw materials are prepared according to the alloy element composition and melted into a casting rod. By mass percentage, the alloy element composition includes: Si: 0.04%, Cu: 0.11%, Mn: 1.21%, Zn: 0.03%, other single elements ≤ 0.05%, the total of other impurity elements ≤ 0.15%, and Al: the balance.

[0066] Comparative Example 3

[0067] The difference from Example 1 is that the raw materials are prepared according to the alloy element composition and melted into a casting rod. By mass percentage, the alloy element composition includes: Si: 0.04%, Fe: 0.17%, Mn: 1.21%, Zn: 0.03%, other single elements ≤ 0.05%, the total of other impurity elements ≤ 0.15%, and Al: the balance.

[0068] Comparative Example 4

[0069] The difference from Example 1 is that the raw materials are prepared according to the alloy element composition and melted into a casting rod. By mass percentage, the alloy element composition includes: Si: 0.04%, Fe: 0.17%, Cu: 0.11%, Zn: 0.03%, other single elements ≤ 0.05%, the total of other impurity elements ≤ 0.15%, and Al: the balance.

[0070] Comparative Example 5

[0071] The difference from Example 1 is that the raw materials are prepared according to the alloy element composition and melted into a casting rod. By mass percentage, the alloy element composition includes: Si: 0.04%, Fe: 0.17%, Cu: 0.11%, Mn: 1.21%, other single elements ≤ 0.05%, the total of other impurity elements ≤ 0.15%, and Al: the balance.

[0072] Performance test

[0073] The tensile property tests were carried out on the plates obtained from Examples 1 - 3 and Comparative Examples 1 - 5 according to the standard GB / T 4338 - 2006, and the test results are shown in Table 1 below.

[0074] Table 1

[0075] <![CDATA[σ b (MPa)]]> <![CDATA[σ 0.2 (MPa)]]> Example 1 542 318 Example 2 534 309 Example 3 537 304 Comparative Example 1 408 254 Comparative Example 2 379 174 Comparative Example 3 391 182 Comparative Example 4 368 135 Comparative Example 5 404 271

[0076] As can be seen from Table 1, the plates prepared in Examples 1 - 3 have excellent tensile properties and improved processing plasticity by optimizing the raw material composition.

[0077] The above has described in detail some embodiments of the present invention, but the above content is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A battery box extrusion molding process for 3003 material, characterized in that: The following steps are involved: S1. Prepare raw materials according to the alloy element composition and melt and cast into cast rods. The alloy element composition includes Si: 0.04-0.1%, Fe: 0.17-0.2%, Cu: 0.05-0.2%, Mn: 1-1.5%, Zn: 0.03-0.1%, other single elements ≤ 0.05%, other impurity elements total ≤ 0.15%, Al: balance; S2, sequentially subjecting the cast rod to homogenization, torsional deformation, online quenching, aging treatment, and passing it into an extrusion die for extrusion molding to obtain a plate; S3, stretching and straightening the plate, bending according to specifications, welding, grinding, spraying, quality inspection, and packaging to obtain the battery box; The extrusion molding process parameters are as follows: The heating temperature of the extrusion die is 450-470° C., the insulation time is 10-12 hours, the heating temperature of the extrusion barrel is 400-420° C., and the extrusion speed is 5-10 m / min.

2. According to claim 1, a battery box extrusion molding process of 3003 material is characterized in that: Calculated by mass percentage, the alloy element composition includes: Si: 0.04%, Fe: 0.17%, Cu: 0.11%, Mn: 1.21%, Zn: 0.03%, other single elements ≤ 0.05%, other impurity elements total ≤ 0.15%, Al: balance.

3. According to claim 1, a battery box extrusion molding process of 3003 material is characterized in that: The homogenization refers to keeping the cast rod at 465-475° C. for 20-30 hours and naturally cooling it to room temperature.

4. The extrusion molding process of a battery box made of 3003 material according to claim 1, characterized in that: The torsional deformation refers to the torsion between the high-pressure torsion upper and lower dies of the 250t high-pressure torsion equipment, the working pressure is 5GPa, the rotation speed is 1r / min, the high-pressure torsion temperature is room temperature, and the high-pressure torsion speed is 2-5r.

5. The extrusion molding process of a battery box made of 3003 material according to claim 1, characterized in that: The stretching rate of the stretching straightening is 0.5-2.0%.

6. The extrusion molding process of a battery box made of 3003 material according to claim 1, characterized in that: The temperature of the aging treatment is 175°C and the time is 30-50 minutes.

7. The extrusion molding process of a battery box made of 3003 material according to claim 1, characterized in that: The quenching temperature is 480-520°C.

8. A battery box made of 3003 material made by the extrusion molding process of the battery box made of 3003 material as described in any one of claims 1 to 7.

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