CN110541095A - Preparation method of high-performance aluminum alloy automobile parts - Google Patents
Preparation method of high-performance aluminum alloy automobile parts Download PDFInfo
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- CN110541095A CN110541095A CN201910806381.5A CN201910806381A CN110541095A CN 110541095 A CN110541095 A CN 110541095A CN 201910806381 A CN201910806381 A CN 201910806381A CN 110541095 A CN110541095 A CN 110541095A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/2272—Sprue channels
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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
- C22C21/04—Modified aluminium-silicon alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
the preparation method of the high-performance aluminum alloy automobile part comprises the following steps: preparing raw materials, by percentage: 9.0 to 10 percent of Si; 0.051 to 0.54 percent of Mg; fe is less than or equal to 1.5 percent; 2.5 to 4.0 percent of Cu; mn is less than or equal to 0.56 percent, and Ni is less than or equal to 0.56 percent; zn is less than or equal to 1.3 percent; ti is less than or equal to 0.26 percent; cr is less than or equal to 0.16 percent; silver Cr is less than or equal to 0.1 percent; graphite Cr is less than or equal to 0.16 percent; the silicon carbide Cr is less than or equal to 0.16 percent, and the balance of Al is occupied; modification treatment; electromagnetic stirring; injecting oxygen; curing the die-casting part; and (5) forming by using a demolding tool.
Description
Technical Field
The invention relates to the technical field of die-casting molding, and particularly discloses a preparation method of a high-performance aluminum alloy automobile part.
Background
Die casting is called casting for short, and is a precision forming technology for metal parts close to the final shape and size, and the final product is a die casting. The essence of the method is that under the action of high pressure, liquid metal is filled into a die cavity at high speed, and is formed and solidified under the action of pressure, so that a die casting with clear outline and smooth surface is obtained. In the non-ferrous metal casting industry, die casting is an important casting method. In recent years, light alloys mainly containing magnesium and aluminum have gained importance in the die casting industry, and aluminum alloy castings obtained by die casting account for about six components of the total amount of lead alloy castings.
In recent years, with the acceleration of weight reduction of automobiles, the performance requirements of parts of automobiles are more severe, such as high yield strength required in the design of automobile parts, high elongation, excellent impact toughness, good wear resistance and fatigue performance required in deformation. At present, automobile materials in domestic and foreign markets use aluminum alloys on a large scale, but common aluminum alloys cannot meet the requirements of the modern automobile industry, for example, the aluminum magnesium materials in the current markets have the defects of poor mechanical property, poor cutting processability and the like, most of the aluminum alloys are prepared by heat treatment, the cost consumption is high, and higher requirements are provided for the alloy materials and the preparation process thereof.
Therefore, it is necessary to provide a method for preparing high-performance aluminum alloy automobile parts to solve the above problems.
Disclosure of Invention
the invention aims to provide a preparation method of a high-performance aluminum alloy automobile part.
The technical scheme is as follows:
a preparation method of a high-performance aluminum alloy automobile part comprises the following steps:
1) preparing raw materials, by percentage:
9.0 to 10 percent of Si; 0.051 to 0.54 percent of Mg; fe is less than or equal to 1.5 percent; 2.5 to 4.0 percent of Cu; mn is less than or equal to 0.56 percent, and Ni is less than or equal to 0.56 percent; zn is less than or equal to 1.3 percent; ti is less than or equal to 0.26 percent; cr is less than or equal to 0.16 percent; silver Cr is less than or equal to 0.1 percent; graphite Cr is less than or equal to 0.16 percent; the silicon carbide Cr is less than or equal to 0.16 percent, and the balance of Al is occupied;
2) melting the raw materials, heating to 720-750 ℃, adding a modifier, heating to 810 ℃ for modification treatment, wherein the addition amount of the modifier is 0.7 percent of the total weight of the ingredients, obtaining molten metal liquid, and then preserving heat;
3) performing electromagnetic stirring on the molten metal liquid, wherein the electromagnetic stirring current is 30-45A, the frequency is 30-35Hz, and performing circumferential stirring for 3-5 minutes to obtain material liquid;
4) Closing the die to form a cavity and a pouring gate, injecting oxygen into an injection chamber and the cavity of the die-casting die through a gas injection hole arranged on the downstream side of a pouring gate, removing air in the injection chamber and the cavity, cleaning the injection chamber and the cavity, and injecting the oxygen for 10-15 seconds at the pressure of 0.8-1.2 MPa;
5) stopping injecting oxygen into the die cavity and the injection chamber and vacuumizing the die cavity and the injection chamber from the top of the die-casting die; injecting an alloy melt into the injection chamber from the sprue gate, controlling the temperature of the alloy melt to be 690-710 ℃ during injection, pressing a punch into the injection chamber at the speed of 0.2-0.3 m/s after injection is finished, enabling the alloy melt in the injection chamber to enter a cavity through a pouring gate, stopping vacuumizing and linearly accelerating the punch when the punch advances to one third of the volume of the injection chamber, accelerating the pressing speed of the punch to 3-4 m/s when the punch advances to two thirds of the volume of the injection chamber, and keeping the pressure of the punch to be 12-15MPa after the punch is pressed until a die-cast part is solidified;
6) and (5) forming by using a demolding tool.
further, in the step 3), inert gas is introduced for protection.
further, the inert gas in the step 3) is argon with the purity of 99.99 percent.
Further, in the step 4), when the gap between the parting surfaces of the molds is 20 mm, the mold closing is stopped.
compared with the prior art, the invention greatly reduces the development cost, has high product percent of pass, has better void ratio than the common process design, has stable product mold filling process and greatly reduces the defective rate of air holes inside the die casting, not only improves the quality, but also reduces the labor intensity.
Detailed Description
example (b):
A preparation method of a high-performance aluminum alloy automobile part comprises the following steps:
1) Preparing raw materials, by percentage:
9.0 to 10 percent of Si; 0.051 to 0.54 percent of Mg; fe is less than or equal to 1.5 percent; 2.5 to 4.0 percent of Cu; mn is less than or equal to 0.56 percent, and Ni is less than or equal to 0.56 percent; zn is less than or equal to 1.3 percent; ti is less than or equal to 0.26 percent; cr is less than or equal to 0.16 percent; silver Cr is less than or equal to 0.1 percent; graphite Cr is less than or equal to 0.16 percent; the silicon carbide Cr is less than or equal to 0.16 percent, and the balance of Al is occupied;
2) Melting the raw materials, heating to 720-750 ℃, adding a modifier, heating to 810 ℃ for modification treatment, wherein the addition amount of the modifier is 0.7 percent of the total weight of the ingredients, obtaining molten metal liquid, and then preserving heat;
3) Performing electromagnetic stirring on the molten metal liquid, wherein the electromagnetic stirring current is 30-45A, the frequency is 30-35Hz, and performing circumferential stirring for 3-5 minutes to obtain material liquid;
4) closing the die to form a cavity and a pouring gate, injecting oxygen into an injection chamber and the cavity of the die-casting die through a gas injection hole arranged on the downstream side of a pouring gate, removing air in the injection chamber and the cavity, cleaning the injection chamber and the cavity, and injecting the oxygen for 10-15 seconds at the pressure of 0.8-1.2 MPa;
5) Stopping injecting oxygen into the die cavity and the injection chamber and vacuumizing the die cavity and the injection chamber from the top of the die-casting die; injecting an alloy melt into the injection chamber from the sprue gate, controlling the temperature of the alloy melt to be 690-710 ℃ during injection, pressing a punch into the injection chamber at the speed of 0.2-0.3 m/s after injection is finished, enabling the alloy melt in the injection chamber to enter a cavity through a pouring gate, stopping vacuumizing and linearly accelerating the punch when the punch advances to one third of the volume of the injection chamber, accelerating the pressing speed of the punch to 3-4 m/s when the punch advances to two thirds of the volume of the injection chamber, and keeping the pressure of the punch to be 12-15MPa after the punch is pressed until a die-cast part is solidified;
6) And (5) forming by using a demolding tool.
and 3) introducing inert gas for protection.
argon with the purity of 99.99 percent is selected as the inert gas in the step 3).
And 4) stopping die assembly when the gap between the parting surfaces of the dies is 20 mm.
In the embodiment, the mold can be insulated during molding, and the insulation temperature is 200-250 ℃;
After the forming, the uniform speed water cooling structure is adopted to cool the die and the product at a uniform speed, the uniform speed water cooling structure can be adopted to arrange a water cooling pipeline on the die, and the uniform speed cooling is realized by controlling water cooling at a uniform speed.
compared with the prior art, the invention greatly reduces the development cost, has high product percent of pass, has better void ratio than the common process design, has stable product mold filling process and greatly reduces the defective rate of air holes inside the die casting, not only improves the quality, but also reduces the labor intensity.
what has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (4)
1. A preparation method of a high-performance aluminum alloy automobile part is characterized by comprising the following steps: the method comprises the following steps:
1) preparing raw materials, by percentage:
9.0 to 10 percent of Si; 0.051 to 0.54 percent of Mg; fe is less than or equal to 1.5 percent; 2.5 to 4.0 percent of Cu; mn is less than or equal to 0.56 percent, and Ni is less than or equal to 0.56 percent; zn is less than or equal to 1.3 percent; ti is less than or equal to 0.26 percent; cr is less than or equal to 0.16 percent; silver Cr is less than or equal to 0.1 percent; graphite Cr is less than or equal to 0.16 percent; the silicon carbide Cr is less than or equal to 0.16 percent, and the balance of Al is occupied;
2) Melting the raw materials, heating to 720-750 ℃, adding a modifier, heating to 810 ℃ for modification treatment, wherein the addition amount of the modifier is 0.7 percent of the total weight of the ingredients, obtaining molten metal liquid, and then preserving heat;
3) Performing electromagnetic stirring on the molten metal liquid, wherein the electromagnetic stirring current is 30-45A, the frequency is 30-35Hz, and performing circumferential stirring for 3-5 minutes to obtain material liquid;
4) closing the die to form a cavity and a pouring gate, injecting oxygen into an injection chamber and the cavity of the die-casting die through a gas injection hole arranged on the downstream side of a pouring gate, removing air in the injection chamber and the cavity, cleaning the injection chamber and the cavity, and injecting the oxygen for 10-15 seconds at the pressure of 0.8-1.2 MPa;
5) Stopping injecting oxygen into the die cavity and the injection chamber and vacuumizing the die cavity and the injection chamber from the top of the die-casting die; injecting an alloy melt into the injection chamber from the sprue gate, controlling the temperature of the alloy melt to be 690-710 ℃ during injection, pressing a punch into the injection chamber at the speed of 0.2-0.3 m/s after injection is finished, enabling the alloy melt in the injection chamber to enter a cavity through a pouring gate, stopping vacuumizing and linearly accelerating the punch when the punch advances to one third of the volume of the injection chamber, accelerating the pressing speed of the punch to 3-4 m/s when the punch advances to two thirds of the volume of the injection chamber, and keeping the pressure of the punch to be 12-15MPa after the punch is pressed until a die-cast part is solidified;
6) and (5) forming by using a demolding tool.
2. The method for preparing the high-performance aluminum alloy automobile part according to claim 1, wherein the method comprises the following steps: and 3) introducing inert gas for protection.
3. The method for preparing the high-performance aluminum alloy automobile part according to claim 2, wherein the method comprises the following steps: argon with the purity of 99.99 percent is selected as the inert gas in the step 3).
4. The method for preparing the high-performance aluminum alloy automobile part according to claim 3, wherein the method comprises the following steps: and 4) stopping die assembly when the gap between the parting surfaces of the dies is 20 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910806381.5A CN110541095A (en) | 2019-08-29 | 2019-08-29 | Preparation method of high-performance aluminum alloy automobile parts |
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| CN201910806381.5A CN110541095A (en) | 2019-08-29 | 2019-08-29 | Preparation method of high-performance aluminum alloy automobile parts |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111004946A (en) * | 2019-12-30 | 2020-04-14 | 宁波杰达模具机械有限公司 | Die-casting forming process of gearbox clutch shell |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040055726A1 (en) * | 2002-09-25 | 2004-03-25 | Chunpyo Hong | Die casting method and apparatus for rheocasting |
| CN106244870A (en) * | 2016-08-31 | 2016-12-21 | 宁波环亚机械制造有限公司 | A kind of production technology of automobile diecast parts |
| CN108067600A (en) * | 2016-11-17 | 2018-05-25 | 机械科学研究总院（将乐）半固态技术研究所有限公司 | A kind of reho-forming method of high efficiency, low cost manufacture semisolid Al-Si line aluminium alloy casting |
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2019
- 2019-08-29 CN CN201910806381.5A patent/CN110541095A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040055726A1 (en) * | 2002-09-25 | 2004-03-25 | Chunpyo Hong | Die casting method and apparatus for rheocasting |
| CN106244870A (en) * | 2016-08-31 | 2016-12-21 | 宁波环亚机械制造有限公司 | A kind of production technology of automobile diecast parts |
| CN108067600A (en) * | 2016-11-17 | 2018-05-25 | 机械科学研究总院（将乐）半固态技术研究所有限公司 | A kind of reho-forming method of high efficiency, low cost manufacture semisolid Al-Si line aluminium alloy casting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111004946A (en) * | 2019-12-30 | 2020-04-14 | 宁波杰达模具机械有限公司 | Die-casting forming process of gearbox clutch shell |
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Application publication date: 20191206 |