CN112779444A - Aluminum alloy die casting for riveting and preparation method thereof - Google Patents
Aluminum alloy die casting for riveting and preparation method thereof Download PDFInfo
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- CN112779444A CN112779444A CN202011559481.1A CN202011559481A CN112779444A CN 112779444 A CN112779444 A CN 112779444A CN 202011559481 A CN202011559481 A CN 202011559481A CN 112779444 A CN112779444 A CN 112779444A
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- aluminum alloy
- riveting
- casting
- die casting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing 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 silicon as the next major constituent
Abstract
The invention belongs to the technical field of alloy material processing, and particularly relates to an aluminum alloy die casting for riveting and a preparation method thereof. According to the invention, Sr and Mg are added into alloy raw materials, so that the elongation of the material is more than or equal to 7%, the tensile strength is more than or equal to 160Mpa, the yield strength is more than or equal to 80Mpa, the heat treatment temperature is controlled at 280-300 ℃ in the preparation process, the time is 3-8h, and the obtained die-casting aluminum alloy completely meets the riveting mechanical property and ensures that the riveting is not cracked through double optimization of components and processes.
Description
Technical Field
The invention belongs to the technical field of alloy material processing, and particularly relates to an aluminum alloy die casting for riveting and a preparation method thereof.
Background
With the requirement of industrial lightweight of new energy automobiles, automobile bodies and key parts of the automobile bodies reach more than 80% of aluminum alloy extruded profile parts and die-cast aluminum alloy parts, particularly, the advantages of high production efficiency and low cost of the die-cast aluminum alloy are used in batches by various automobile manufacturers, and with the popularization of automobile structure riveting modes, the requirements on mechanical properties and riveting of the die-cast aluminum alloy materials are higher and higher.
Most of the existing die-casting aluminum alloy for riveting new energy automobiles is AlSi10MnMg aluminum alloy material, T6 heat treatment is adopted in the preparation process, namely 490-560 ℃/1h high-temperature solid solution and 180 ℃/3h artificial aging treatment, but because the die-casting aluminum alloy often generates a bubbling phenomenon in the heat treatment process (at high temperature), the strength of the material is greatly reduced, and the compressed air holes near the surface layer in the casting are freely expanded, so that the defects of hole explosion and the like are formed. In addition, the die-casting aluminum alloy is deformed in the solid solution treatment stage, and the deformation is accelerated in the quenching process, so that the deformation amount reaches 280mm/1mm, the product cannot be normally used or is completely machined, the reject ratio of the product is greatly increased, the resource waste is caused, and the manufacturing cost is greatly increased.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an aluminum alloy die casting for riveting and a preparation method thereof.
The above object of the present invention can be achieved by the following technical solutions: an aluminum alloy die casting for riveting is characterized in that the aluminum alloy casting is prepared from the following raw materials in percentage by mass: 0.2-0.3%, Si: 1.4-1.6%, Mn: 0.05-0.2%, Cr: 0.1-0.5%, Zn: 0.1-0.4%, Ti: 0.1-0.2%, Sr: 0.2-0.3%, and the balance of Al and inevitable impurities.
The aluminum alloy die casting adopted by the invention contains more low-melting-point components, the expansion coefficient of the aluminum alloy die casting is relatively close to that of the aluminum alloy section for the new energy to be riveted, when the aluminum alloy die casting and the aluminum alloy section for the new energy to be riveted are used in a complex environment, particularly a high-temperature environment, the riveting part can not expand or separate, and good bonding strength can still be kept.
Preferably, the aluminum alloy casting is made of the following raw materials in percentage by mass: 0.25-0.3%, Si: 1.5-1.6%, Mn: 0.1-0.2%, Cr: 0.2-0.4%, Zn: 0.2-0.3%, Ti: 0.15-0.2%, Sr: 0.2-0.25% of Al and inevitable impurities.
The second purpose of the invention is to provide a preparation method of the aluminum alloy die casting, which comprises the following preparation steps:
s1, weighing raw materials Al, Mg, Si, Mn, Cr, Zn, Ti and Sr, and smelting into alloy liquid;
s2, pouring the alloy liquid into a vacuum die-casting die to prepare a blank;
s3, post-processing the blank to obtain a semi-finished product;
and S4, carrying out heat treatment on the semi-finished product to obtain the aluminum alloy die casting for riveting.
Preferably, the melting temperature in the step S1 is 730-760 ℃. Melting at this temperature can minimize the burning of the easily burnt elements and the oxidation of the molten alloy liquid.
Preferably, the temperature for casting in the step S2 is 670-700 ℃. The alloy liquid is poured into the vacuum die-casting die at the temperature, which is beneficial to improving the mechanical property of the alloy.
Preferably, the heat treatment in step S4 is specifically: placing the semi-finished product in a heat treatment furnace, and carrying out heat treatment at the temperature of 280-300 ℃ for 3-8 h. Compared with the aluminum alloy treated by the T6 in the prior art, the heat treatment condition of the invention can completely meet the mechanical property of the die-casting aluminum alloy riveting and ensure that the riveting does not crack.
Further preferably, the temperature of the heat treatment is 290-300 ℃ and the time is 4-6 h.
The invention has the beneficial effects that:
the alloy raw materials of the invention have reasonable compatibility, the elongation of the material is more than or equal to 7 percent, the tensile strength is more than or equal to 160Mpa, the yield strength is more than or equal to 80Mpa by adding Sr and Mg, the heat treatment temperature is controlled at 300 ℃ and the time is 3-8h in the preparation process, and the obtained die-casting aluminum alloy completely meets the riveting mechanical property and ensures that the riveting is not cracked by double optimization of components and processes.
Drawings
FIG. 1: the riveting effect diagram of the aluminum alloy die casting in the embodiment 1 of the invention;
FIG. 2 is a drawing: comparative example 1 aluminum alloy die casting riveting effect diagram;
FIG. 3: comparative example 2 riveting effect diagram of aluminum alloy die casting;
Detailed Description
The following are specific examples of the present invention and illustrate the technical solutions of the present invention for further description, but the present invention is not limited to these examples.
Example 1
An aluminum alloy die casting for riveting is characterized in that the aluminum alloy casting is prepared from the following raw materials in percentage by mass: 0.25%, Si: 1.5%, Mn: 0.1%, Cr: 0.2%, Zn: 0.2%, Ti: 0.15%, Sr: 0.2% of the balance of Al and inevitable impurities;
weighing the raw materials Al, Mg, Si, Mn, Cr, Zn, Ti and Sr according to the mass percentage, and smelting the raw materials into alloy liquid at 740 ℃;
pouring the alloy liquid into a vacuum die-casting die at 670 ℃ to prepare a blank; trimming and removing a water gap of the blank and performing shot blasting treatment on the blank to prepare a semi-finished product;
and (3) placing the semi-finished product in a heat treatment furnace, and carrying out heat treatment at 290 ℃ for 4h to obtain the aluminum alloy die casting for riveting.
Example 2
An aluminum alloy die casting for riveting is characterized in that the aluminum alloy casting is prepared from the following raw materials in percentage by mass: 0.3%, Si: 1.6%, Mn: 0.2%, Cr: 0.4%, Zn: 0.3%, Ti: 0.2%, Sr: 0.25% of the balance of Al and inevitable impurities;
weighing the raw materials Al, Mg, Si, Mn, Cr, Zn, Ti and Sr according to the mass percentage, and smelting the raw materials into alloy liquid at 730 ℃;
pouring the alloy liquid into a vacuum die-casting die at 680 ℃ to prepare a blank; trimming and removing a water gap of the blank and performing shot blasting treatment on the blank to prepare a semi-finished product;
and (3) placing the semi-finished product in a heat treatment furnace, and carrying out heat treatment at 280 ℃ for 6h to obtain the aluminum alloy die casting for riveting.
Example 3
An aluminum alloy die casting for riveting is characterized in that the aluminum alloy casting is prepared from the following raw materials in percentage by mass: 0.2%, Si: 1.45%, Mn: 0.05%, Cr: 0.1%, Zn: 0.1%, Ti: 0.1%, Sr: 0.2%, the balance being Al and unavoidable impurities;
weighing the raw materials Al, Mg, Si, Mn, Cr, Zn, Ti and Sr according to the mass percentage, and smelting the raw materials into alloy liquid at the temperature of 750 ℃;
pouring the alloy liquid into a vacuum die-casting die at 690 ℃ to prepare a blank; trimming and removing a water gap of the blank and performing shot blasting treatment on the blank to prepare a semi-finished product;
and (3) placing the semi-finished product in a heat treatment furnace, and carrying out heat treatment at 280 ℃ for 3h to obtain the aluminum alloy die casting for riveting.
Example 4
An aluminum alloy die casting for riveting is characterized in that the aluminum alloy casting is prepared from the following raw materials in percentage by mass: 0.3%, Si: 1.5%, Mn: 0.15%, Cr: 0.4%, Zn: 0.25%, Ti: 0.15%, Sr: 0.25%, the balance being Al and unavoidable impurities;
weighing the raw materials Al, Mg, Si, Mn, Cr, Zn, Ti and Sr according to the mass percentage, and smelting the raw materials into alloy liquid at 740 ℃;
pouring the alloy liquid into a vacuum die-casting die at 680 ℃ to prepare a blank; trimming and removing a water gap of the blank and performing shot blasting treatment on the blank to prepare a semi-finished product;
and (3) placing the semi-finished product in a heat treatment furnace, and carrying out heat treatment at 280 ℃ for 6h to obtain the aluminum alloy die casting for riveting.
Example 5
An aluminum alloy die casting for riveting is characterized in that the aluminum alloy casting is prepared from the following raw materials in percentage by mass: 0.2%, Si: 1.6%, Mn: 0.2%, Cr: 0.5%, Zn: 0.4%, Ti: 0.2%, Sr: 0.3%, the balance being Al and inevitable impurities;
weighing the raw materials Al, Mg, Si, Mn, Cr, Zn, Ti and Sr according to the mass percentage, and smelting the raw materials into alloy liquid at 730 ℃;
pouring the alloy liquid into a vacuum die-casting die at 700 ℃ to prepare a blank; trimming and removing a water gap of the blank and performing shot blasting treatment on the blank to prepare a semi-finished product;
and (3) placing the semi-finished product in a heat treatment furnace, and carrying out heat treatment at 300 ℃ for 8h to obtain the aluminum alloy die casting for riveting.
Comparative example 1
The difference from the example 1 is that the aluminum alloy material is AlSi10 MnMg.
Comparative example 2
The method is different from the embodiment 1 in that the heat treatment is carried out on the aluminum alloy die casting by adopting the prior art of 490-560 ℃/1h high-temperature solid solution and 180 ℃/3h artificial aging treatment.
The riveting effect is that the aluminum alloy die castings in the above examples and comparative examples are applied to the riveting process of the battery case of the new energy automobile.
The aluminum alloy die castings of examples 1 to 5 and comparative examples 1 to 2 were subjected to performance tests, and the results are shown in Table 1:
table 1: results of Performance test of aluminum alloy die castings in examples 1 to 5 and comparative examples 1 to 2
Through a large number of verification, the aluminum alloy die casting material can completely meet the riveting mechanical property and ensure that riveting is not cracked only if the elongation percentage is more than or equal to 7 percent, the tensile strength is more than or equal to 160MPa and the yield strength is more than or equal to 80MPa, and the aluminum alloy die casting with the performance parameters within the range can meet the riveting connection of new energy automobile parts.
The technical scope of the invention claimed by the embodiments herein is not exhaustive and new solutions formed by equivalent replacement of single or multiple technical features in the embodiments are also within the scope of the invention, and all parameters involved in the solutions of the invention do not have mutually exclusive combinations if not specifically stated.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (7)
1. The aluminum alloy die casting for riveting is characterized in that the aluminum alloy casting is made of the following raw materials in percentage by mass: 0.2-0.3%, Si: 1.4-1.6%, Mn: 0.05-0.2%, Cr: 0.1-0.5%, Zn: 0.1-0.4%, Ti: 0.1-0.2%, Sr: 0.2-0.3%, and the balance of Al and inevitable impurities.
2. The aluminum alloy die casting according to claim 1, wherein the aluminum alloy casting is made of Mg from the following raw materials in mass percent: 0.25-0.3%, Si: 1.5-1.6%, Mn: 0.1-0.2%, Cr: 0.2-0.4%, Zn: 0.2-0.3%, Ti: 0.15-0.2%, Sr: 0.2-0.25% of Al and inevitable impurities.
3. A method of producing an aluminum alloy die cast part according to claim 1, comprising the steps of:
s1, weighing raw materials Al, Mg, Si, Mn, Cr, Zn, Ti and Sr, and smelting into alloy liquid;
s2, pouring the alloy liquid into a vacuum die-casting die to prepare a blank;
s3, post-processing the blank to obtain a semi-finished product;
and S4, carrying out heat treatment on the semi-finished product to obtain the aluminum alloy die casting for riveting.
4. The method for producing an aluminum alloy die casting according to claim 3, wherein the temperature for melting in step S1 is 730-760 ℃.
5. The method for producing an aluminum alloy die casting according to claim 3, wherein the temperature for casting in the step S2 is 670-700 ℃.
6. The method for producing an aluminum alloy die casting according to claim 3, wherein the heat treatment in step S4 is specifically: placing the semi-finished product in a heat treatment furnace, and carrying out heat treatment at the temperature of 280-300 ℃ for 3-8 h.
7. The method for preparing the aluminum alloy die casting as recited in claim 6, wherein the temperature of the heat treatment is 290 ℃ to 300 ℃, and the time is 4-6 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113909448A (en) * | 2021-10-09 | 2022-01-11 | 润星泰(常州)技术有限公司 | Preparation method of aluminum alloy die casting for riveting of new energy vehicle and die casting |
| CN114574736A (en) * | 2022-03-03 | 2022-06-03 | 威海万丰镁业科技发展有限公司 | Preparation method of high-strength aluminum alloy and high-strength aluminum alloy |
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|---|---|---|---|---|
| CN104451278A (en) * | 2013-09-23 | 2015-03-25 | 比亚迪股份有限公司 | Die casting aluminum alloy and preparation method thereof |
| CN106148767A (en) * | 2015-03-30 | 2016-11-23 | 华为技术有限公司 | A kind of aluminium alloy and its preparation method and application |
| CN109778025A (en) * | 2017-11-15 | 2019-05-21 | 青岛海大智汇科技管理咨询有限公司 | A kind of pack alloy and preparation method thereof |
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- 2020-12-25 CN CN202011559481.1A patent/CN112779444A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451278A (en) * | 2013-09-23 | 2015-03-25 | 比亚迪股份有限公司 | Die casting aluminum alloy and preparation method thereof |
| CN106148767A (en) * | 2015-03-30 | 2016-11-23 | 华为技术有限公司 | A kind of aluminium alloy and its preparation method and application |
| CN109778025A (en) * | 2017-11-15 | 2019-05-21 | 青岛海大智汇科技管理咨询有限公司 | A kind of pack alloy and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113909448A (en) * | 2021-10-09 | 2022-01-11 | 润星泰(常州)技术有限公司 | Preparation method of aluminum alloy die casting for riveting of new energy vehicle and die casting |
| CN114574736A (en) * | 2022-03-03 | 2022-06-03 | 威海万丰镁业科技发展有限公司 | Preparation method of high-strength aluminum alloy and high-strength aluminum alloy |
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Application publication date: 20210511 |
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