CN111195720A - Low-pressure casting process of automobile wheel - Google Patents
Low-pressure casting process of automobile wheel Download PDFInfo
- Publication number
- CN111195720A CN111195720A CN201811374721.3A CN201811374721A CN111195720A CN 111195720 A CN111195720 A CN 111195720A CN 201811374721 A CN201811374721 A CN 201811374721A CN 111195720 A CN111195720 A CN 111195720A
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- Prior art keywords
- pressure
- casting
- low
- aluminum
- mold
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Classifications
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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
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a low-pressure casting process of an automobile wheel, which comprises the following steps: a. preheating a mould: spraying a graphite coating with a certain thickness in a mold cavity, and heating the mold to 250 +/-20 ℃; b. and (3) low-pressure casting molding: the aluminum-nickel alloy solution starts to fill the die cavity under the pressure of 0.01-0.02MPa, the filling time is 8-12s, the pressure in the die is increased to 0.04-0.05MPa at the speed of 0.002MPa/s after the casting is finished, and the pressure is maintained for 2-3 min; c. pressure relief and demolding: and (4) releasing pressure after the casting is formed, and demolding after the mold is naturally cooled after the pressure is released. Through the mode, the process is simple and easy to control, a riser is not required to be arranged in the casting process, the utilization rate of the aluminum-nickel alloy liquid can be improved, and meanwhile, the aluminum-nickel alloy liquid is crystallized under pressure, so that the casting is compact in structure, good in surface smoothness and good in mechanical property, and fine machining is not required after casting.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a low-pressure casting process of an automobile wheel.
Background
The automobile wheels have large and small sizes, positive offset and negative offset, are round castings, have uniform wall thickness and large area, are thick, and have large thermal junctions at the joints of the spokes and the wheel rims. The wheel needs to be provided with a riser in the casting process, so that the using amount of molten metal is increased, the front surface of the wheel is a decorative surface, and the requirement is generally high, so that the wheel casting needs to be subjected to finish machining after being cast, and the wheel can have good surface finish.
Disclosure of Invention
The invention mainly solves the technical problems that: aiming at the defects of the prior art, the low-pressure casting process of the automobile wheel is provided, the process is simple, a dead head is not required to be arranged, the molten metal utilization rate is high, the quality of a cast product obtained by casting is high, the surface smoothness is good, and finish machining is not required after casting.
In order to solve the technical problems, the invention adopts a technical scheme that: the low-pressure casting process of the automobile wheel comprises the following steps:
a. preheating a mould: spraying a graphite coating with a certain thickness in a mold cavity, and heating the mold to 250 +/-20 ℃;
b. and (3) low-pressure casting molding: the aluminum-nickel alloy solution starts to fill the die cavity under the pressure of 0.01-0.02MPa, the filling time is 8-12s, the pressure in the die is increased to 0.04-0.05MPa at the speed of 0.002MPa/s after the casting is finished, and the pressure is maintained for 2-3 min;
c. pressure relief and demolding: and (4) releasing pressure after the casting is formed, and demolding after the mold is naturally cooled after the pressure is released.
In a preferred embodiment of the invention, the graphite coating has a thickness of 25-30 μm.
In a preferred embodiment of the invention, the temperature of the aluminum-nickel alloy solution during filling is controlled to be 560 +/-20 ℃.
The invention has the beneficial effects that: the invention has simple and easily controlled process, no need of riser in the casting process, can improve the utilization rate of the aluminum-nickel alloy liquid, and simultaneously, the aluminum-nickel alloy liquid is crystallized under pressure, so that the casting has compact structure, good surface finish and good mechanical property, and finish machining is not needed after casting.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
The embodiment of the invention comprises the following steps:
the first embodiment is as follows:
a low-pressure casting process of an automobile wheel comprises the following steps:
a. preheating a mould: uniformly spraying a graphite coating with the thickness of 25 mu m on the inner surface of a die cavity of the die, and heating the die to 230 ℃;
b. and (3) low-pressure casting molding: filling the mold cavity with the aluminum-nickel alloy solution at the temperature of 540 ℃ under the pressure of 0.01MPa for 8s, pressurizing the mold to 0.04MPa at the speed of 0.002MPa/s after the pouring is finished, and maintaining the pressure for 2 min;
c. pressure relief and demolding: and (4) releasing pressure after the casting is formed, and demolding after the mold is naturally cooled after the pressure is released.
Example two:
a low-pressure casting process of an automobile wheel comprises the following steps:
a. preheating a mould: uniformly spraying a graphite coating with the thickness of 28 mu m on the inner surface of a die cavity of the die, and heating the die to 250 ℃;
b. and (3) low-pressure casting molding: the aluminum-nickel alloy solution with the temperature of 560 ℃ starts to fill the die cavity under the pressure of 0.015MPa, the filling time is 10s, the pressure in the die is increased to 0.045MPa at the speed of 0.002MPa/s after the completion of the casting, and the pressure is maintained for 2.5 min;
c. pressure relief and demolding: and (4) releasing pressure after the casting is formed, and demolding after the mold is naturally cooled after the pressure is released.
Example three:
a low-pressure casting process of an automobile wheel comprises the following steps:
a. preheating a mould: uniformly spraying a graphite coating with the thickness of 30 mu m on the inner surface of a die cavity of the die, and heating the die to 270 ℃;
b. and (3) low-pressure casting molding: the aluminum nickel alloy solution with the temperature of 580 ℃ starts to fill the die cavity of the die under the pressure of 0.02MPa, the filling time is 12s, the pressure in the die is increased to 0.05MPa at the speed of 0.002MPa/s after the pouring is finished, and the pressure is maintained for 3 min;
c. pressure relief and demolding: and (4) releasing pressure after the casting is formed, and demolding after the mold is naturally cooled after the pressure is released.
The invention discloses a low-pressure casting process of automobile wheels, which has the advantages of simple and easily-controlled process, no need of a dead head in the casting process, capability of improving the utilization rate of an aluminum-nickel alloy liquid, crystallization of the aluminum-nickel alloy liquid under pressure, compact casting structure, good surface smoothness, good mechanical property and no need of finish machining after casting.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. The low-pressure casting process of the automobile wheel is characterized by comprising the following steps of:
a. preheating a mould: spraying a graphite coating with a certain thickness in a mold cavity, and heating the mold to 250 +/-20 ℃;
b. and (3) low-pressure casting molding: the aluminum-nickel alloy solution starts to fill the die cavity under the pressure of 0.01-0.02MPa, the filling time is 8-12s, the pressure in the die is increased to 0.04-0.05MPa at the speed of 0.002MPa/s after the casting is finished, and the pressure is maintained for 2-3 min;
c. pressure relief and demolding: and (4) releasing pressure after the casting is formed, and demolding after the mold is naturally cooled after the pressure is released.
2. The low-pressure casting process of an automobile wheel according to claim 1, wherein the graphite coating has a thickness of 25-30 μm.
3. The low-pressure casting process of automobile wheels according to claim 1, wherein the temperature of the aluminum-nickel alloy solution during filling is controlled to be 560 ± 20 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374721.3A CN111195720A (en) | 2018-11-19 | 2018-11-19 | Low-pressure casting process of automobile wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374721.3A CN111195720A (en) | 2018-11-19 | 2018-11-19 | Low-pressure casting process of automobile wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111195720A true CN111195720A (en) | 2020-05-26 |
Family
ID=70741450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811374721.3A Pending CN111195720A (en) | 2018-11-19 | 2018-11-19 | Low-pressure casting process of automobile wheel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111195720A (en) |
-
2018
- 2018-11-19 CN CN201811374721.3A patent/CN111195720A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200526 |