A preparation process for composite 7-series aluminum alloy sheet

Abstract

This invention discloses a manufacturing process for composite 7-series aluminum alloy sheets. The composite 7-series aluminum alloy sheets are formed by laminating and rolling multiple layers of 7-series aluminum alloy sheets and multiple layers of 1-series aluminum alloy connecting plates. The 7-series aluminum alloy sheets are composed of the following components by weight percentage: Si: ≤0.22%, Cr: ≤0.23%, Fe: ≤0.35%, Cu: 2.0-3.5%, Mg: 3.5-4.5%, Zn: 6.5-10.0%, Ti: 0.015-0.2%, Zr: 0.05-0.15%, rare earth cerium alloy: 0.015-0.05%, total impurities ≤0.1%, and the remainder being aluminum. This invention uses a lamination method to roll multiple layers of 7-series aluminum alloy sheets and multiple layers of 1-series aluminum alloy connecting plates, which effectively improves plasticity, toughness, and strength. Compared with existing single 7-series materials, it has higher material strength, better impact resistance and weldability, can adapt to corrosion resistance in complex environments, and extends service life.

Description

Technical Field

[0001] This invention relates to a manufacturing process for composite 7-series aluminum alloy sheets. Background Technology

[0002] With the advancement of modern military equipment technology, special vehicles are developing towards lightweight design, which is one of the important conditions for modernizing armored vehicles and improving their mobility. Among lightweight materials, aluminum alloys are a key choice.

[0003] Aluminum alloys are made by adding alloying elements to pure aluminum. Examples include Al-Mn alloys (manganese added), Al-Cu alloys (copper added), Al-Cu-Mg hard aluminum alloys (copper and magnesium added simultaneously), and Al-Zn-Mg-Cu super-hard aluminum alloys (zinc, magnesium, and copper added simultaneously). Aluminum alloys are characterized by their lightness, high strength, good heat dissipation, pleasant feel, and ease of anodizing. Under the same strength requirements, aluminum alloy parts can be made thinner and lighter than plastic parts, while also meeting the requirements of high integration, thinness, miniaturization, impact resistance, electromagnetic shielding, and heat dissipation in 3C products.

[0004] Although many 7-series aluminum alloy products have emerged in the existing technology, which have better mechanical properties than 6-series aluminum alloys, the mechanical properties, corrosion resistance, fracture toughness and fatigue resistance of existing 7-series aluminum alloys still need further improvement in order to meet higher market demands. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-strength, high-toughness 7-series aluminum alloy and its preparation process.

[0006] A high-strength and high-toughness 7-series aluminum alloy is composed of the following components by weight percentage: Si: ≤0.22%; Cr: ≤0.23%; Fe: ≤0.35%; Cu: 2.0-3.5%; Mg: 3.5-4.5%; Zn: 6.5-10.0%; Ti: 0.015-0.2%; Zr: 0.05-0.15%; rare earth cerium alloy: 0.05-0.015%; total impurities ≤0.1%; the remainder is aluminum.

[0007] As a further improvement, the multi-layer composite 7-series aluminum alloy is made by stacking and rolling multiple layers of 7-series aluminum alloy plates and multiple layers of 1-series aluminum alloy connecting plates. Compared with single 7-series aluminum alloy, the stacked arrangement can better enhance the material strength, effectively improve its impact resistance, and effectively expand its application range.

[0008] As a further improvement, the content of each individual impurity in the total impurities of the seven-series aluminum alloy is ≤0.015%, which effectively controls the impurities, avoids excessive impurity content from causing a decline in material performance, and effectively improves the material performance, toughness and strength.

[0009] A process for preparing a high-strength, high-toughness 7-series aluminum alloy includes the following steps:

[0010] Step 1; Ingredients: Ingredients are prepared according to the composition of the seven-series aluminum alloy as described in claims 1 to 3 to form preparation raw material A, and rare earth cerium alloy is prepared separately to form preparation raw material B. Rare earth cerium alloy is widely used in alloy metal production and cast iron, and can effectively improve the processing performance of alloy metals and enhance their strength, toughness, corrosion resistance, oxidation resistance and impact resistance.

[0011] Step 2; Melting: Raw material A is put into the melting furnace. During the melting process, after raw material A is completely liquefied, it is stirred by a stirring device to form solution A. Then, the solution A is analyzed by spectral analysis. When the analysis results meet the preparation requirements, it is refined. The stirring device is an electromagnetic stirrer. The electromagnetic stirrer can stir solution A more thoroughly, accelerate the melting speed of raw material A, ensure its uniformity in the melting process, and reduce melting costs.

[0012] Step 3; Refining: After the solution A that meets the requirements is completely melted, the temperature of the melting furnace is increased for refining. After the refining temperature is raised to 700~750°C, the raw material B is added to the solution A. After melting, solution B is formed. The refining time is 5~15 minutes. Then, it is allowed to stand and kept warm. During the standing process, solution B is continuously stirred using a stirring device. First, the raw material A is melted and then the raw material B is added. This allows it to be more evenly integrated into solution A, ensuring that the raw material is evenly distributed inside solution B, ensuring the chemical properties of each part of the prepared material, and improving the quality of the material.

[0013] Step 4; Slag Removal: Use a slag removal vehicle to remove slag from the surface of the refined and settled solution B, and then filter solution B.

[0014] Step 5; Casting: Solution B is made into an ingot with a square shape. A square preparation module is printed using 3D printing technology. The preparation module is then placed on a cooling platform to obtain the square ingot.

[0015] Step 6; Rolling: The surface of the ingot is milled, followed by multiple hot rough rolling, multiple hot fine rolling, and multiple cold rolling to obtain alloy plates. Multiple rolling processes can effectively improve the preparation quality and effect, avoid cracks, unevenness, and damage during the rolling process, and improve the yield of the finished product.

[0016] Step 7; Annealing: Place the alloy sheet in an air cushion furnace for annealing at a temperature of 350-480℃ and a speed of 30-35m / min. The layered laying method can effectively improve the structural strength, service life, and corrosion resistance of the material. It has the characteristics of high strength, high toughness, and low density. After the layering operation, ultrasonic testing is performed.

[0017] Step 8; Composite cold rolling: Multiple 7-series aluminum alloy plates are laminated with multiple 1-series aluminum alloy connecting plates, and then composite cold rolling is performed to obtain a composite 7-series aluminum alloy plate semi-finished product.

[0018] Step 9; Homogenization treatment: The composite 7-series aluminum alloy sheet semi-finished product undergoes multiple homogenization heat treatments to obtain the composite 7-series aluminum alloy sheet finished product. Then, the surface of the composite 7-series aluminum alloy sheet finished product is cleaned using a rinsing device and dried with hot air. The cleaning liquid is water, and the rinsing device is a double water jet impact device.

[0019] Step 10; Straightening: Straighten and correct the finished composite 7-series aluminum alloy sheet, then saw it and package it.

[0020] As a further improvement, in step six, the hot roughing is performed using a low-speed rolling operation, and the hot finishing is performed using a medium-speed rolling operation followed by a high-speed rolling operation.

[0021] As a further improvement, the composite rolling in step seven is performed using hot isostatic pressing welding.

[0022] As a further improvement, the heat preservation time in step three is 30~60 minutes.

[0023] As a further improvement, the temperatures during hot roughing and hot finishing in step six are both between 250 and 310°C. Beneficial effects

[0024] This invention discloses a high-strength, high-toughness 7-series aluminum alloy and its preparation process. The multi-layer composite 7-series aluminum alloy produced by this method has good preparation effect, few surface defects, high density, and lightweight characteristics. The material properties and yield are effectively improved. The preparation method can reduce energy consumption and greatly reduce production costs, making it suitable for large-scale production and use. Moreover, the mechanical properties of the prepared material are tensile strength ≥550 MPa, yield strength ≥500 MPa, and elongation ≥5%, which fully meet the requirements for armor materials.

[0025] This invention employs multiple rolling methods to achieve effective step-by-step rolling processing, avoiding cracking and damage during the rolling process, improving the product yield and yield rate during the rolling process, and enhancing its surface gloss and aesthetics.

[0026] This invention employs a lamination method to roll multiple layers of 7-series aluminum alloy plates and multiple layers of 1-series aluminum alloy connecting plates, effectively improving plasticity, toughness, and strength. Compared with existing single 7-series materials, it has higher material strength, better impact resistance and weldability, can adapt to corrosion resistance in complex environments, and extends service life. Detailed Implementation

[0027] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. Example

[0028] A high-strength and high-toughness 7-series aluminum alloy is composed of the following components by weight percentage: Si: 0.1%; Cr: 0.2%; Fe: 0.3%; Cu: 3.0%; Mg: 4.0%; Zn: 9.0%; Ti: 0.19%; Zr: 0.12%; rare earth cerium alloy: 0.015%; total impurities: 0.8%; the remainder is aluminum.

[0029] Multi-layer composite 7-series aluminum alloy is made by laminating and rolling multiple layers of 7-series aluminum alloy plates and multiple layers of 1-series aluminum alloy connecting plates. Compared with single 7-series aluminum alloy, the lamination arrangement can better enhance the material strength, effectively improve its impact resistance, and effectively expand its application range.

[0030] The content of each individual impurity in the total impurities of the 7-series aluminum alloy is 0.01%, which effectively controls the impurities and avoids the decline in material performance caused by excessive impurities, thereby effectively improving the material performance, toughness and strength.

[0031] A process for preparing a high-strength, high-toughness 7-series aluminum alloy includes the following steps:

[0032] Step 1; Ingredients: Ingredients are prepared according to the composition of the seven-series aluminum alloy as described in claims 1 to 3 to form preparation raw material A, and rare earth cerium alloy is prepared separately to form preparation raw material B. Rare earth cerium alloy is widely used in alloy metal production and cast iron, and can effectively improve the processing performance of alloy metals and enhance their strength, toughness, corrosion resistance, oxidation resistance and impact resistance.

[0033] Step 2; Melting: Raw material A is put into the melting furnace. During the melting process, after raw material A is completely liquefied, it is stirred by a stirring device to form solution A. Then, the solution A is analyzed by spectral analysis. When the analysis results meet the preparation requirements, it is refined. The stirring device is an electromagnetic stirrer. The electromagnetic stirrer can stir solution A more thoroughly, accelerate the melting speed of raw material A, ensure its uniformity in the melting process, and reduce melting costs.

[0034] Step 3; Refining: After the solution A that meets the requirements is completely melted, the temperature of the melting furnace is increased for refining. After the refining temperature is raised to 700°C, the raw material B is added to the solution A and melted to form solution B. The refining time is 15 minutes. Then, it is allowed to stand and kept warm. During the standing process, solution B is continuously stirred using a stirring device. First, the raw material A is melted and then the raw material B is added. This allows it to be more evenly integrated into solution A, ensuring that the raw material is evenly distributed inside solution B, thus ensuring the chemical properties of each part of the prepared material and improving the quality of the material.

[0035] Step 4; Slag Removal: Use a slag removal vehicle to remove slag from the surface of the refined and settled solution B, and then filter solution B.

[0036] Step 5; Casting: Solution B is made into an ingot with a square shape. A square preparation module is printed using 3D printing technology. The preparation module is then placed on a cooling platform to obtain the square ingot.

[0037] Step 6; Rolling: The surface of the ingot is milled, followed by multiple hot rough rolling, multiple hot fine rolling, and multiple cold rolling to obtain alloy plates. Multiple rolling processes can effectively improve the preparation quality and effect, avoid cracks, unevenness, and damage during the rolling process, and improve the yield of the finished product.

[0038] Step 7; Annealing: The alloy sheet is placed in an air cushion furnace for annealing at a temperature of 350℃ and a speed of 35m / min. The layered laying method can effectively improve the structural strength, service life, and corrosion resistance of the material. It has the characteristics of high strength, high toughness, and low density. After the layering operation, ultrasonic testing is performed.

[0039] Step 8; Composite cold rolling: Multiple 7-series aluminum alloy plates are laminated with multiple 1-series aluminum alloy connecting plates, and then composite cold rolling is performed to obtain a composite 7-series aluminum alloy plate semi-finished product.

[0040] Step 9; Homogenization treatment: The composite 7-series aluminum alloy sheet semi-finished product undergoes multiple homogenization heat treatments to obtain the composite 7-series aluminum alloy sheet finished product. Then, the surface of the composite 7-series aluminum alloy sheet finished product is cleaned using a rinsing device and dried with hot air. The cleaning liquid is water, and the rinsing device is a double water jet impact device.

[0041] Step 10; Straightening: Straighten and correct the finished composite 7-series aluminum alloy sheet, then saw it and package it.

[0042] In step six, hot roughing is performed using a low-speed rolling operation, while hot finishing is performed using a medium-speed rolling operation followed by a high-speed rolling operation.

[0043] In step seven, the composite rolling process employs hot isostatic pressing welding.

[0044] The heat preservation time in step three is 60 minutes.

[0045] In step six, the temperatures during hot roughing and hot finishing are both between 310°C. Example

[0046] A high-strength and high-toughness 7-series aluminum alloy is composed of the following components by weight percentage: Si: 0.15%; Cr: 0.1%; Fe: 0.25%; Cu: 2.0%; Mg: 3.5%; Zn: 6.5%; Ti: 0.015%; Zr: 0.05%; rare earth cerium alloy: 0.05%; total impurities: 0.1%; the remainder is aluminum.

[0047] Multi-layer composite 7-series aluminum alloy is made by laminating and rolling multiple layers of 7-series aluminum alloy plates and multiple layers of 1-series aluminum alloy connecting plates. Compared with single 7-series aluminum alloy, the lamination arrangement can better enhance the material strength, effectively improve its impact resistance, and effectively expand its application range.

[0048] The content of each individual impurity in the total impurities of the 7-series aluminum alloy is 0.015%, which effectively controls the impurities and avoids the decline in material performance caused by excessive impurities, thereby effectively improving the material performance, toughness and strength.

[0049] A process for preparing a high-strength, high-toughness 7-series aluminum alloy includes the following steps:

[0050] Step 1; Ingredients: Ingredients are prepared according to the composition of the seven-series aluminum alloy as described in claims 1 to 3 to form preparation raw material A, and rare earth cerium alloy is prepared separately to form preparation raw material B. Rare earth cerium alloy is widely used in alloy metal production and cast iron, and can effectively improve the processing performance of alloy metals and enhance their strength, toughness, corrosion resistance, oxidation resistance and impact resistance.

[0051] Step 2; Melting: Raw material A is put into the melting furnace. During the melting process, after raw material A is completely liquefied, it is stirred by a stirring device to form solution A. Then, the solution A is analyzed by spectral analysis. When the analysis results meet the preparation requirements, it is refined. The stirring device is an electromagnetic stirrer. The electromagnetic stirrer can stir solution A more thoroughly, accelerate the melting speed of raw material A, ensure its uniformity in the melting process, and reduce melting costs.

[0052] Step 3; Refining: After the solution A that meets the requirements is completely melted, the temperature of the melting furnace is increased for refining. After the refining temperature is raised to 700°C, the raw material B is added to the solution A. After melting, solution B is formed. The refining time is 5 minutes. Then, it is allowed to stand and kept warm. During the standing process, solution B is continuously stirred using a stirring device. First, the raw material A is melted and then the raw material B is added. This allows it to be more evenly integrated into solution A, ensuring that the raw material is evenly distributed inside solution B, thus ensuring the chemical properties of each part of the prepared material and improving the quality of the material.

[0053] Step 4; Slag Removal: Use a slag removal vehicle to remove slag from the surface of the refined and settled solution B, and then filter solution B.

[0054] Step 5; Casting: Solution B is made into an ingot with a square shape. A square preparation module is printed using 3D printing technology. The preparation module is then placed on a cooling platform to obtain the square ingot.

[0055] Step 6; Rolling: The surface of the ingot is milled, followed by multiple hot rough rolling, multiple hot fine rolling, and multiple cold rolling to obtain alloy plates. Multiple rolling processes can effectively improve the preparation quality and effect, avoid cracks, unevenness, and damage during the rolling process, and improve the yield of the finished product.

[0056] Step 7; Annealing: The alloy sheet is placed in an air cushion furnace for annealing at a temperature of 350℃ and a speed of 30m / min. The layered laying method can effectively improve the structural strength, service life, and corrosion resistance of the material. It has the characteristics of high strength, high toughness, and low density. After the layering operation, ultrasonic testing is performed.

[0057] Step 8; Composite cold rolling: Multiple 7-series aluminum alloy plates are laminated with multiple 1-series aluminum alloy connecting plates, and then composite cold rolling is performed to obtain a composite 7-series aluminum alloy plate semi-finished product.

[0058] Step 9; Homogenization treatment: The composite 7-series aluminum alloy sheet semi-finished product undergoes multiple homogenization heat treatments to obtain the composite 7-series aluminum alloy sheet finished product. Then, the surface of the composite 7-series aluminum alloy sheet finished product is cleaned using a rinsing device and dried with hot air. The cleaning liquid is water, and the rinsing device is a double water jet impact device.

[0059] Step 10; Straightening: Straighten and correct the finished composite 7-series aluminum alloy sheet, then saw it and package it.

[0060] In step six, hot roughing is performed using a low-speed rolling operation, while hot finishing is performed using a medium-speed rolling operation followed by a high-speed rolling operation.

[0061] In step seven, the composite rolling process employs hot isostatic pressing welding.

[0062] The heat preservation time in step three is 30 minutes.

[0063] In step six, the temperatures during hot roughing and hot finishing are both between 310°C.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A manufacturing process for a composite 7-series aluminum alloy sheet, characterized in that, The composite 7-series aluminum alloy sheet is formed by laminating and rolling multiple layers of 7-series aluminum alloy sheets and multiple layers of 1-series aluminum alloy connecting sheets. The 7-series aluminum alloy sheet is composed of the following components by weight percentage. Composition: Si: ≤0.22%, Cr: ≤0.23%, Fe: ≤0.35%, Cu: 2.0-3.5%, Mg: 3.5-4.5%, Zn: 6.5-10.0%, Ti: 0.015~0.2%, Zr: 0.05-0.15%, rare earth cerium alloy: 0.015~0.05%, total impurities ≤0.1%, the remainder is aluminum; The content of each individual impurity in the total impurities of the 7-series aluminum alloy plate is ≤0.015%; The preparation process of the composite 7-series aluminum alloy sheet includes the following steps: Step 1; Ingredient preparation: Prepare the ingredients according to the composition of the 7-series aluminum alloy plate to form preparation material A, and prepare the rare earth cerium alloy separately to form preparation material B; Step Two; Melting: Raw material A is put into a melting furnace. During the melting process, when raw material A is completely liquefied, it is stirred by a stirring device to form solution A. Then, the solution A is analyzed by spectral analysis. When the analysis results meet the preparation requirements, it is refined. Step 3; Refining: After the solution A that meets the requirements is completely melted, the temperature of the melting furnace is increased for refining. After the refining temperature is raised to 700~750°C, the raw material B is added to the solution A. After melting, solution B is formed. The refining time is 5~15 minutes. Then, it is allowed to stand and kept warm. During the standing process, solution B is continuously stirred using a stirring device. Step 4; Slag Removal: Use a slag removal vehicle to remove slag from the surface of the refined and settled solution B, and then filter solution B. Step 5; Casting: Solution B is made into an ingot with a square shape. A square preparation module is printed using 3D printing technology. The preparation module is then placed on a cooling platform to obtain the square ingot. Step Six; Rolling: The surface of the ingot is milled, followed by multiple hot rough rolling, multiple hot fine rolling, and multiple cold rolling to obtain alloy plates; Step 7; Annealing: The alloy sheet is placed in an air cushion furnace for annealing at a temperature of 350-480℃ and a speed of 30-35m / min. Step 8; Composite cold rolling: Multiple 7-series aluminum alloy plates are laminated with multiple 1-series aluminum alloy connecting plates, and then composite cold rolling is performed to obtain a composite 7-series aluminum alloy plate semi-finished product. Step 9; Homogenization treatment: The composite 7-series aluminum alloy sheet semi-finished product undergoes multiple homogenization heat treatments to obtain the composite 7-series aluminum alloy sheet finished product. Then, the surface of the composite 7-series aluminum alloy sheet finished product is cleaned using a rinsing device and dried with hot air. The cleaning liquid is water, and the rinsing device is a double water jet impact device. Step 10; Straightening: The finished composite 7-series aluminum alloy sheet is straightened and corrected, then sawn and packaged.

2. The preparation process of the composite 7-series aluminum alloy sheet according to claim 1, characterized in that, In step six, hot roughing is performed using a low-speed rolling operation, while hot finishing is performed using a medium-speed rolling operation followed by a high-speed rolling operation.

3. The preparation process of the composite 7-series aluminum alloy sheet according to claim 1, characterized in that, The heat preservation time in step three is 30-60 minutes.

4. The preparation process of the composite 7-series aluminum alloy sheet according to claim 1, characterized in that, In step six, the temperatures during hot roughing and hot finishing are both between 250 and 310°C.