CN112453359A - High strength aluminum alloy car motor casing - Google Patents
High strength aluminum alloy car motor casing Download PDFInfo
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- CN112453359A CN112453359A CN202011449485.4A CN202011449485A CN112453359A CN 112453359 A CN112453359 A CN 112453359A CN 202011449485 A CN202011449485 A CN 202011449485A CN 112453359 A CN112453359 A CN 112453359A
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- Prior art keywords
- aluminum alloy
- attapulgite
- extrusion casting
- strength
- solid product
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/18—Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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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
- B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
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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
Abstract
The invention relates to the technical field of automobile part processing and preparation, and discloses a high-strength aluminum alloy automobile motor shell.
Description
Technical Field
The invention belongs to the technical field of processing and preparation of automobile parts, and particularly relates to a high-strength aluminum alloy automobile motor shell.
Background
With the development of the automotive industry, traditional cast iron materials are gradually replaced by aluminum alloys with lower density. The automobile motor shell is made of aluminum alloy materials, so that the weight of an automobile can be reduced, and the heat dissipation effect of the motor can be improved.
However, in the existing casting process, parts made of aluminum alloy are prone to shrinkage porosity in machining, the prepared motor shell is low in air tightness, the forming quality is affected, and the product yield of the motor shell is reduced. The shrinkage porosity and shrinkage cavity of the casting can be reduced to a certain extent by adopting the extrusion casting mode, and the problem that the mechanical property of the extrusion casting alloy is not favorable due to overhigh or overlow pressure still exists. Finally, the compactness and the mechanical property of the motor shell are reduced.
Disclosure of Invention
The invention aims to provide a high-strength aluminum alloy automobile motor shell aiming at the existing problems.
The invention is realized by the following technical scheme:
a high-strength aluminum alloy automobile motor shell specifically comprises the following steps:
pouring the 724-plus 730 ℃ aluminum alloy melt into a mold cavity for extrusion casting, wherein the mold temperature is 260-plus 265 ℃, the pressure is 76-79MPa, the dwell time is 48-50 seconds, and the initial extrusion speed is 0.033-0.035 m/s.
The surface of the die cavity used for extrusion casting is sprayed with a layer of the prepared strength material, and the spraying thickness is 1.4-1.8 microns.
The preparation method of the strength material comprises the following steps: weighing 18-25 g of attapulgite, grinding the attapulgite until the attapulgite passes through a sieve of 20-30 meshes, adding 4-5 g of carbon powder with the particle size of 1-2 microns, mixing and grinding the mixture for 10-15 minutes, adding 60-70 ml of sodium citrate aqueous solution with the mass concentration of 0.4-0.5%, continuously stirring the mixture for 20-30 minutes, then centrifuging the mixture to obtain a solid product, placing the solid product in a tubular furnace, heating the solid product to 660-680 ℃ at the speed of 5.5-5.8 ℃/minute under the protection of nitrogen, and naturally cooling the solid product.
The aluminum alloy comprises the following components in percentage by mass: cu: 3.8-4.2%, Si: 7.4-7.8%, Mn: 0.33-0.36%, Ti: 0.03-0.04%, Fe: 1.0-1.2%, Mg: 0.23-0.25%, Sn: 0.20-0.26%, Mo: 0.24-0.28%, Ni: 0.2-0.4%, Ce: 0.006-0.008%, V: 0.06-0.08%, Zr: 0.03-0.05%; the balance being aluminum and unavoidable impurities.
Preferably, the aluminum alloy contains, by mass: cu: 3.8-4.0%, Si: 7.4-7.6%, Mn: 0.34-0.36%, Ti: 0.030 to 0.034%, Fe: 1.0-1.1%, Mg: 0.24-0.25%, Sn: 0.20-0.22%, Mo: 0.26-0.28%, Ni: 0.3-0.4%, Ce: 0.007-0.008%, V: 0.06-0.07%, Zr: 0.04-0.05%; the balance being aluminum and unavoidable impurities.
Compared with the prior art, the invention has the following advantages: in order to solve the problems of the existing aluminum alloy material in the manufacturing of the automobile motor shell, the invention provides the high-strength aluminum alloy automobile motor shell, elements such as Ce, V and Zr which can enhance the strength of the whole alloy are added into the aluminum alloy, the strength reduction problem caused by the influence of temperature on the aluminum alloy in extrusion casting can be improved by a small amount of improved elements, and the prepared strength material is sprayed on the surface of a die cavity.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described with reference to specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the present invention and are not used for limiting the technical solutions provided by the present invention.
Example 1
A high-strength aluminum alloy automobile motor shell specifically comprises the following steps:
pouring the 724 ℃ aluminum alloy melt into a die cavity for extrusion casting, wherein the die temperature is 260 ℃, the pressure is 76MPa, the pressure maintaining time is 48 seconds, and the initial extrusion speed is 0.033 m/s.
The surface of a die cavity used for extrusion casting is sprayed with a layer of the prepared strength material, and the spraying thickness is 1.4 microns.
The preparation method of the strength material comprises the following steps: weighing 18 g of attapulgite, grinding to pass through a 20-mesh sieve, adding 4 g of carbon powder with the particle size of 1-2 microns, mixing and grinding for 10 minutes, adding 60 ml of 0.4% sodium citrate aqueous solution, continuously stirring for 20 minutes, then centrifuging to obtain a solid product, placing the solid product in a tubular furnace, heating to 660 ℃ at the speed of 5.5 ℃/minute under the protection of nitrogen, and naturally cooling.
The aluminum alloy comprises the following components in percentage by mass: cu: 3.8%, Si: 7.4%, Mn: 0.33%, Ti: 0.03%, Fe: 1.0%, Mg: 0.23%, Sn: 0.20%, Mo: 0.24%, Ni: 0.2%, Ce: 0.006%, V: 0.06%, Zr: 0.03 percent; the balance being aluminum and unavoidable impurities.
Example 2
A high-strength aluminum alloy automobile motor shell specifically comprises the following steps:
pouring 727 ℃ aluminum alloy melt into a die cavity of a die for extrusion casting, wherein the temperature of the die is 263 ℃, the pressure is 77MPa, the pressure maintaining time is 49 seconds, and the initial extrusion speed is 0.034 m/s.
The surface of a die cavity used for extrusion casting is sprayed with a layer of the prepared strength material, and the spraying thickness is 1.6 microns.
The preparation method of the strength material comprises the following steps: weighing 21 g of attapulgite, grinding the attapulgite until the attapulgite passes through a 25-mesh sieve, adding 4.5 g of carbon powder with the particle size of 1-2 microns, mixing and grinding for 12 minutes, adding 65 ml of 0.45 mass percent aqueous solution of sodium citrate, continuously stirring for 25 minutes, then centrifuging to obtain a solid product, placing the solid product in a tubular furnace, heating to 670 ℃ at the speed of 5.6 ℃/minute under the protection of nitrogen, and naturally cooling.
The aluminum alloy comprises the following components in percentage by mass: cu: 3.9%, Si: 7.5%, Mn: 0.35%, Ti: 0.032%, Fe: 1.05%, Mg: 0.245%, Sn: 0.21%, Mo: 0.27%, Ni: 0.35%, Ce: 0.0075%, V: 0.065%, Zr: 0.045%; the balance being aluminum and unavoidable impurities.
Example 3
A high-strength aluminum alloy automobile motor shell specifically comprises the following steps:
and pouring the 730 ℃ aluminum alloy melt into a mold cavity for extrusion casting, wherein the mold temperature is 265 ℃, the pressure is 79MPa, the pressure maintaining time is 50 seconds, and the initial extrusion speed is 0.035 m/s.
The surface of a die cavity used for extrusion casting is sprayed with a layer of the prepared strength material, and the spraying thickness is 1.8 microns.
The preparation method of the strength material comprises the following steps: weighing 25 g of attapulgite, grinding the attapulgite until the attapulgite passes through a 30-mesh sieve, adding 5 g of carbon powder with the particle size of 1-2 microns, mixing and grinding the mixture for 15 minutes, adding 70 ml of 0.5% sodium citrate aqueous solution, continuously stirring the mixture for 30 minutes, then centrifuging the mixture to obtain a solid product, placing the solid product in a tubular furnace, heating the solid product to 680 ℃ at the speed of 5.8 ℃/minute under the protection of nitrogen, and naturally cooling the solid product.
The aluminum alloy comprises the following components in percentage by mass: cu: 4.2%, Si: 7.8%, Mn: 0.36%, Ti: 0.04%, Fe: 1.2%, Mg: 0.25%, Sn: 0.26%, Mo: 0.28%, Ni: 0.4%, Ce: 0.008%, V: 0.08%, Zr: 0.05 percent; the balance being aluminum and unavoidable impurities.
Comparative example 1
The difference from example 1 is that the step of spraying a layer of the prepared strength material on the surface of the cavity of the mold is omitted and the rest is kept the same.
Comparative example 2
The only difference from example 2 is that the aluminum alloy contains, in mass percent: cu: 3.9%, Si: 7.5%, Mn: 0.35%, Ti: 0.032%, Fe: 1.05%, Mg: 0.245%, Sn: 0.21%, Mo: 0.27%, Ni: 0.35 percent; the balance of aluminum and inevitable impurities, the balance being consistent.
Control group
The difference from example 1 is that the silicon carbide coating material was sprayed to the same thickness in the mold cavity as the control, and the rest was kept the same.
Comparative experiment
The high-strength aluminum alloy automobile motor shell is prepared by respectively using the methods of examples 1-3, comparative examples 1-2 and a control group, a tensile sample is processed according to the GB/T228-2002 standard, the mechanical property test is carried out according to the test standard, the hardness is measured according to GB231, independent variables are kept consistent in the test, the result statistical analysis is carried out (before the test, the test design is carried out by using a statistical method, then the test is carried out, the test data is recorded, the test result is obtained by analysis, and the statistical tool is fully used for explaining the result to the greatest extent in the process), and the results are shown in the following table:
| item | Hardness (HRF) | Elongation (%) | Tensile strength (MPa) |
| Example 1 | 74.8 | 16.22 | 305 |
| Example 2 | 75.2 | 16.27 | 306 |
| Example 3 | 74.4 | 16.14 | 304 |
| Comparative example 1 | 65.0 | 13.01 | 241 |
| Comparative example 2 | 66.2 | 14.56 | 245 |
| Control group | 71.0 | 15.73 | 286 |
The invention effectively solves the problems existing in the casting process of the existing automobile motor shell made of aluminum alloy, improves the service performance and service life of the automobile motor shell, can realize the practical significance of improving the processing production efficiency of automobile parts, and is a technical scheme which is extremely worthy of popularization and application.
Claims (5)
1. The utility model provides a high strength aluminum alloy car motor casing which characterized in that adopts extrusion casting processing technology to process the aluminum alloy melt, includes the following steps:
pouring the 724-plus 730 ℃ aluminum alloy melt into a mold cavity for extrusion casting, wherein the pressure is 76-79MPa, the pressure maintaining time is 48-50 seconds, and the initial extrusion speed is 0.033-0.035 m/s;
the surface of a die cavity used for extrusion casting is sprayed with a layer of prepared strength material, and the spraying thickness is 1.4-1.8 microns;
the preparation method of the strength material comprises the following steps: weighing 18-25 g of attapulgite, grinding the attapulgite until the attapulgite passes through a sieve of 20-30 meshes, adding 4-5 g of carbon powder, mixing and grinding for 10-15 minutes, adding 60-70 ml of sodium citrate aqueous solution, continuously stirring for 20-30 minutes, then centrifuging to obtain a solid product, placing the solid product in a tubular furnace, heating to 660-680 ℃ at the speed of 5.5-5.8 ℃/minute under the protection of nitrogen, and naturally cooling;
the aluminum alloy comprises the following components in percentage by mass: cu: 3.8-4.2%, Si: 7.4-7.8%, Mn: 0.33-0.36%, Ti: 0.03-0.04%, Fe: 1.0-1.2%, Mg: 0.23-0.25%, Sn: 0.20-0.26%, Mo: 0.24-0.28%, Ni: 0.2-0.4%, Ce: 0.006-0.008%, V: 0.06-0.08%, Zr: 0.03-0.05%; the balance being aluminum and unavoidable impurities.
2. A high strength aluminum alloy motor housing for an automobile according to claim 1, wherein the aluminum alloy contains, in mass percent: cu: 3.8-4.0%, Si: 7.4-7.6%, Mn: 0.34-0.36%, Ti: 0.030 to 0.034%, Fe: 1.0-1.1%, Mg: 0.24-0.25%, Sn: 0.20-0.22%, Mo: 0.26-0.28%, Ni: 0.3-0.4%, Ce: 0.007-0.008%, V: 0.06-0.07%, Zr: 0.04-0.05%; the balance being aluminum and unavoidable impurities.
3. The motor casing of high-strength aluminum alloy for automobile motor as claimed in claim 1, wherein the die temperature in the extrusion casting is 260 ℃ to 265 ℃.
4. The motor housing of claim 1, wherein the carbon powder is prepared in a size range of 1-2 μm.
5. The motor housing of claim 1, wherein the aqueous solution of sodium citrate has a concentration of 0.4-0.5% by weight.
Priority Applications (1)
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|---|---|---|---|
| CN202011449485.4A CN112453359B (en) | 2020-12-12 | 2020-12-12 | High strength aluminum alloy car motor casing |
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| CN202011449485.4A CN112453359B (en) | 2020-12-12 | 2020-12-12 | High strength aluminum alloy car motor casing |
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| CN112453359A true CN112453359A (en) | 2021-03-09 |
| CN112453359B CN112453359B (en) | 2022-08-05 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001220639A (en) * | 2000-01-19 | 2001-08-14 | Aluminium Rheinfelden Gmbh | Aluminum alloy for casting |
| DE102005047037A1 (en) * | 2005-09-30 | 2007-04-19 | BAM Bundesanstalt für Materialforschung und -prüfung | Motorized mating of an aluminum base alloy |
| CN106435344A (en) * | 2016-10-24 | 2017-02-22 | 黄林 | Motor casing casting material |
| CN108018467A (en) * | 2017-12-16 | 2018-05-11 | 苏州纽东精密制造科技有限公司 | A kind of aluminium alloy automobile component and its reinforcement process |
| CN108690937A (en) * | 2018-06-13 | 2018-10-23 | 中原内配集团安徽有限责任公司 | A kind of production method of wearproof engine cylinder sleeve |
| CN110000360A (en) * | 2019-03-05 | 2019-07-12 | 上海交通大学 | The tough high-modulus aluminum alloy materials of height and its preparation based on Extrution casting technique |
| CN110317983A (en) * | 2019-08-16 | 2019-10-11 | 吉林大学 | The Compound Extrusion casting method of high-quality Al alloy automobile gear box casing |
| CN110453115A (en) * | 2019-09-04 | 2019-11-15 | 东莞理工学院 | A kind of automotive speed changer die casting for shell aluminium alloy and its preparation process |
| CN110938767A (en) * | 2018-09-25 | 2020-03-31 | 比亚迪股份有限公司 | Die-casting aluminum alloy and preparation method thereof |
-
2020
- 2020-12-12 CN CN202011449485.4A patent/CN112453359B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001220639A (en) * | 2000-01-19 | 2001-08-14 | Aluminium Rheinfelden Gmbh | Aluminum alloy for casting |
| DE102005047037A1 (en) * | 2005-09-30 | 2007-04-19 | BAM Bundesanstalt für Materialforschung und -prüfung | Motorized mating of an aluminum base alloy |
| CN106435344A (en) * | 2016-10-24 | 2017-02-22 | 黄林 | Motor casing casting material |
| CN108018467A (en) * | 2017-12-16 | 2018-05-11 | 苏州纽东精密制造科技有限公司 | A kind of aluminium alloy automobile component and its reinforcement process |
| CN108690937A (en) * | 2018-06-13 | 2018-10-23 | 中原内配集团安徽有限责任公司 | A kind of production method of wearproof engine cylinder sleeve |
| CN110938767A (en) * | 2018-09-25 | 2020-03-31 | 比亚迪股份有限公司 | Die-casting aluminum alloy and preparation method thereof |
| CN110000360A (en) * | 2019-03-05 | 2019-07-12 | 上海交通大学 | The tough high-modulus aluminum alloy materials of height and its preparation based on Extrution casting technique |
| CN110317983A (en) * | 2019-08-16 | 2019-10-11 | 吉林大学 | The Compound Extrusion casting method of high-quality Al alloy automobile gear box casing |
| CN110453115A (en) * | 2019-09-04 | 2019-11-15 | 东莞理工学院 | A kind of automotive speed changer die casting for shell aluminium alloy and its preparation process |
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| CN112453359B (en) | 2022-08-05 |
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