Aluminum alloy material for high-speed asynchronous motor cast aluminum rotor and preparation method thereof

Abstract

The invention discloses an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor and a preparation method thereof. The aluminum alloy material comprises: 0.3wt%-1.5wt% Ni, 0.2wt%-0.5wt% Fe, 0.2wt%-1.0wt% Si, 0.1wt%-0.8wt% Mg, 0.2wt%-1.0wt% Cu, 0.004wt%-0.05wt% B, 0.0025wt%-0.015wt% Ca, 0.15wt%-0.5wt% Zr, 0.005wt%-0.02wt% Sr, 0.0045wt%-0.025wt% P and V, M n, Ti, Cr, the balance is Al, and the overall content of V, Mn, Ti, Cr is 0~0.05wt%; the present invention designs the mutual combination of elements Mg\Si\Ca, B\Mn\Ti\V\Cr, Cu\Ni and combines it with a specific heat treatment process, controls the precipitation and solid solution of the second phase Mg2Si, Al2CuNi, Al3Fe, AlNi3 components through appropriate temperature and time, reduces the solid solubility in the aluminum matrix, and under the condition that the electrical conductivity is close to that of pure aluminum, the yield strength is increased by 4 times relative to pure aluminum, thereby solving the problem of motor failure caused by rotor deformation and bore sweeping in current asynchronous motors under high-speed application conditions.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloys, and in particular to an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor and a preparation method thereof. Background Art

[0002] With the vigorous development of the new energy vehicle market and the continuous development of innovative technologies, end users have increasingly stringent requirements for vehicle performance, and motor performance is evolving towards high power, high torque, and high power density. In order to achieve higher power density, increasing the motor speed is the most direct and effective method. For asynchronous drive motors, the higher the motor speed, the greater the centrifugal force on the cast aluminum rotor, making it more likely for the rotor to deform and sweep the bore, leading to motor failure.

[0003] Deficiencies of existing technology:

[0004] At present, patent CN114042883B has an alloy element content of 0.03wt% Si, 0.02wt% Fe, 0.02wt% Cu, 0.01wt% Zn, 0.03wt% Ti, 0.03wt% B and 0.4wt% Mg, and the rest are high-purity aluminum, and the yield strength is only 30~40MPa, resulting in low mechanical properties, complex production process, high material cost and other disadvantages. Patent CN114875277A uses heavy rare earth intermediate alloys, which leads to high costs, and the yield strength index in the mechanical properties is only about 55~65MPa, which cannot meet the requirements of high yield strength of materials under high speed conditions. Summary of the invention

[0005] The object of the present invention is to provide an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a high-speed asynchronous motor cast aluminum rotor aluminum alloy material, the aluminum alloy material composition includes: 0.3wt%~1.5wt%Ni, 0.2wt%~0.5wt%Fe, 0.2wt%~1.0wt%Si, 0.1wt%~0.8wt%Mg, 0.2wt%~1.0wt%Cu, 0.004wt%~0.05wt%B, 0.0025wt%~0.015wt%Ca, 0.15wt%~0.5wt%Zr, 0.005wt%~0.02wt%Sr, 0.0045wt%~0.025wt%P and V, Mn, Ti, Cr, the balance is Al, and the overall content of V, Mn, Ti, Cr is 0~0.05wt%.

[0007] Preferably, the mass relationship between V, Mn, Ti and Cr is:

[0008] 0.3≤B:0.5(V+Mn+Ti+Cr)≤1.0;

[0009] The mass relationship between Ca, Mg and Si is:

[0010] 0.25≤10 Ca:(2Mg-Si)≤0.75;

[0011] The mass relationship between Ni and Cu is:

[0012] 2.7≤Ni\Cu≤5.5.

[0013] The present invention also provides a method for preparing an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor, and the preparation method specifically comprises the following steps:

[0014] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain an alloy melt;

[0015] S2, refining the alloy melt to complete degassing and impurity removal;

[0016] S3, feeding the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product;

[0017] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment.

[0018] Preferably, in step S1, after the aluminum alloy material is hot-melted, aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus are added.

[0019] Preferably, in step S1, the preheating temperature is set to 300-450° C., the hot melting temperature is set to 700-780° C., and the stirring time is set to 5-15 min.

[0020] Preferably, in step S2, a protective gas is introduced into the alloy melt, the protective gas is selected from nitrogen or argon, the amount of protective gas introduced is 0.15~6L / min, and RJ-01 refining agent is added, the refining time is 15~25min, and the amount of refining agent added is 0.2wt%~0.5wt% of the mass of the alloy melt.

[0021] Preferably, the casting in step S3 is selected from centrifugal casting and high pressure casting.

[0022] Preferably, the heat treatment method of step S4 is: heating the alloy melt with the furnace, setting the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s; and after the alloy melt is heat treated, the tensile strength is greater than 160MPa, the yield strength is greater than 120MPa, and the electrical conductivity is greater than 32MS / m.

[0023] The invention also discloses an application of an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor. The aluminum alloy material is used for the high-speed asynchronous motor cast aluminum rotor.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The invention discloses an aluminum alloy material for a cast aluminum rotor of a high-speed asynchronous motor and a preparation method thereof. The invention designs and adds an AlB intermediate alloy, which reacts rapidly with impurity elements in aluminum liquid to form borides of Cr, Ti, V and Mn, thereby achieving aluminum liquid purification. The invention also designs and reasonably adds the element ratios of Mg, Si and Ca; performs a modification treatment on the basis of generating a strengthening phase Mg2Si; suppresses the negative influence of a decrease in the electrical conductivity of the material due to the addition of Si, so that the developed material can achieve substantially unchanged electrical conductivity under the condition of achieving improved material strength in combination with a suitable heat treatment process. On this basis, a suitable ratio of Ni to Cu is designed to generate an Al2CuNi strengthening phase, thereby further improving the mechanical properties of the material.

[0026] By designing the mutual combination of elements Mg\Si\Ca, B\Mn\Ti\V\Cr, Cu\Ni and combining it with a specific heat treatment process, the precipitation and solid solution of the second phase Mg2Si, Al2CuNi, Al3Fe, and AlNi3 components are controlled by appropriate temperature and time, thereby reducing the solid solubility in the aluminum matrix. Under the condition that the electrical conductivity is close to that of pure aluminum, the yield strength is increased by 4 times relative to pure aluminum, solving the problem of motor failure caused by rotor deformation and bore sweeping in current asynchronous motors under high-speed application conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a material mechanism evolution diagram of the present invention;

[0028] Figure 2 This is a microstructure diagram of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The existing aluminum alloy materials on the market are difficult to meet the application requirements of high-speed motors; therefore, the development of cast aluminum alloy materials with higher yield strength and higher conductivity has become an urgent need in the current industry. By designing the composition and smelting process of aluminum alloys, the yield strength of aluminum alloys can be further improved without reducing the conductivity, so as to meet the performance requirements of asynchronous motors in new energy vehicles under higher speed conditions.

[0031] The high-yield and high-conductivity aluminum alloy materials are prepared mainly through the optimization design of aluminum alloy components, purification of impurity content, heat treatment process and combined optimization of smelting methods, which has been introduced in the background technology.

[0032] In order to improve the yield strength of the material, some strengthening elements must be added. When the added strengthening elements are dissolved into the aluminum matrix, the electrical conductivity of the material will be sharply reduced. Therefore, it is necessary to set the appropriate element composition, content and heat treatment process to control the form of the strengthening elements in the aluminum matrix. In particular, some transition elements such as Mn, V, Ti, Cr, etc. have a huge impact on the electrical conductivity of the material. The content of these elements in the raw materials must be strictly controlled, and the appropriate aluminum ingots must be selected for production.

[0033] During the research and development process, it was found that by designing the range of B:0.5 (V+Mn+Ti+Cr), the impurities of the aluminum alloy material can be purified, the lattice defects can be reduced, and the conductivity of the material can be improved. By designing the range of 10 Ca:(2Mg-Si), the second phase is strengthened to improve the yield strength of the material, and at the same time, the effect of silicon on the reduction of conductivity is reduced by modification. A reasonable ratio of 2.7≤Ni\Cu≤5.5 is designed to form solid solution strengthening, and the solid solution amount of alloying elements is controlled by combining the heat treatment process, so that the tensile strength and yield strength of the aluminum alloy are significantly improved, and the conductivity can still be maintained at a high level. Among them, the tensile strength can be increased to 160-180MPa, the yield strength can be increased to 120-135MPa, and the conductivity is maintained at 32-33MS / m, which is very suitable for high-speed asynchronous motor cast aluminum rotor products.

[0034] Based on the above findings, through a large number of experiments, the element selection and proportion of aluminum alloys were solidified and multiple verifications were carried out, which significantly improved the performance compared to existing technologies.

[0035] Example 1

[0036] The present invention provides an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor: the aluminum alloy material comprises: 1.3wt% Ni, 0.11wt% Fe, 0.3wt% Si, 0.28wt% Mg, 0.25wt% Cu, 0.008wt% B, 0.01wt% Ca, 0.2wt% Zr, 0.01wt% Sr, 0.005wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.03wt%, the balance is Al, and B:0.5(V+Mn+Ti+Cr) is 0.53, 10 Ca:(2Mg-Si) is 0.38, and Ni\Cu is 5.2.

[0037] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0038] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0039] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0040] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0041] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0042] The main mechanical properties of the standard specimens prepared as above are as follows: tensile strength 166 MPa, yield strength 122 MPa, and electrical conductivity 32.8 MS / m.

[0043] Example 2

[0044] The present invention provides an aluminum alloy material for a cast aluminum rotor of a high-speed asynchronous motor: the aluminum alloy material comprises: 1.5wt% Ni, 0.3wt% Fe, 0.35wt% Si, 0.25wt% Mg, 0.31wt% Cu, 0.01wt% B, 0.015wt% Ca, 0.28wt% Zr, 0.015wt% Sr, 0.01wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.038wt%, the balance is Al, and B:0.5(V+Mn+Ti+Cr) is 0.52, 10 Ca:(2Mg-Si) is 0.42, and Ni\Cu is 4.83.

[0045] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0046] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0047] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0048] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0049] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0050] The main mechanical properties of the standard specimens prepared as above are tested as follows: tensile strength 178 MPa, yield strength 128 MPa, and electrical conductivity 32.2 MS / m.

[0051] Example 3

[0052] The present invention provides an aluminum alloy material for a cast aluminum rotor of a high-speed asynchronous motor: the aluminum alloy material comprises: 1.2wt% Ni, 0.25wt% Fe, 0.4wt% Si, 0.3wt% Mg, 0.35wt% Cu, 0.012wt% B, 0.008wt% Ca, 0.26wt% Zr, 0.019wt% Sr, 0.012wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.027wt%, the balance is Al, and B:0.5(V+Mn+Ti+Cr) is 0.88, 10 Ca:(2Mg-Si) is 0.4, and Ni\Cu is 3.42.

[0053] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0054] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0055] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0056] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0057] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0058] The main mechanical properties of the standard specimens prepared as above are tested as follows: tensile strength 185 MPa, yield strength 134 MPa, and electrical conductivity 32.03 MS / m.

[0059] Example 4

[0060] The present invention provides an aluminum alloy material for a cast aluminum rotor of a high-speed asynchronous motor: the aluminum alloy material comprises: 0.5wt% Ni, 0.35wt% Fe, 0.5wt% Si, 0.39wt% Mg, 0.2wt% Cu, 0.018wt% B, 0.04wt% Ca, 0.35wt% Zr, 0.02wt% Sr, 0.02wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.039wt%, the balance is Al, and B:0.5(V+Mn+Ti+Cr) is 0.92, 10 Ca:(2Mg-Si) is 1.42, and Ni\Cu is 2.5.

[0061] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0062] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0063] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0064] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0065] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0066] The main mechanical properties of the standard specimens prepared as above are tested as follows: tensile strength 166 MPa, yield strength 120 MPa, and electrical conductivity 32.53 MS / m.

[0067] Comparative Example 1

[0068] The present invention provides an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor: the aluminum alloy material composition includes: 1.69wt% Ni, 0.33wt% Fe, 0.42wt% Si, 0.33wt% Mg, 0.28wt% Cu, 0.018wt% B, 0.27wt% Zr, 0.025wt% Sr, 0.014wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.062wt%, and the balance is Al.

[0069] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0070] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0071] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0072] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0073] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0074] The main mechanical properties of the standard specimens prepared as above are tested as follows: tensile strength 148 MPa, yield strength 78 MPa, and electrical conductivity 28 MS / m.

[0075] Comparative Example 2

[0076] The present invention provides an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor: the aluminum alloy material composition includes: 1.99wt% Ni, 0.23wt% Fe, 1.42wt% Si, 0.73wt% Mg, 1.0wt% Cu, 0.32wt% Zr, 0.021wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.082wt%, and the balance is Al.

[0077] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0078] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0079] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0080] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0081] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0082] The main mechanical properties of the standard specimens prepared as above are tested as follows: tensile strength 178 MPa, yield strength 118 MPa, and electrical conductivity 26 MS / m.

[0083] Table 1 Comparison of main chemical composition and mechanical properties of different aluminum alloys

[0084] As shown in Table 1, by controlling the impurity ratio of B and Mn+V+Ti+Cr, the impurity elements in the aluminum alloy are well purified, the matrix grain boundary defects are reduced, the electron scattering is reduced, and the material conductivity is greatly improved. By adjusting the ratio of Ca to (2Mg-Si) and Cu / Ni, the material is first alloyed to improve the material yield strength, and at the same time, combined with the heat treatment process, the solid solution precipitation of the second phase is controlled to reduce the scattering of free electrons in the aluminum matrix; on the basis of achieving the improvement of yield strength, the reduction of material conductivity is not significant; Figure 2It can also be seen that the added AlB alloy has formed a good purification effect. The second phases such as Mn, V, Ti, Cr precipitated in the matrix do not appear in the microstructure. Strengthening phases such as Mg2Si, Al2CuNi, Al3Fe, and AlNi3 exist in the material microstructure, which can significantly improve the yield strength of the material. At the same time, the amount of second phase precipitation is controlled by combining the heat treatment process, thereby reducing electron backscattering and reducing the decrease in conductivity.

[0085] Example 5

[0086] The present invention provides an aluminum alloy material for a cast aluminum rotor of a high-speed asynchronous motor: the aluminum alloy material comprises: 0.5wt% Ni, 0.35wt% Fe, 0.5wt% Si, 0.39wt% Mg, 0.2wt% Cu, 0.018wt% B, 0.04wt% Ca, 0.35wt% Zr, 0.02wt% Sr, 0.02wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.039wt%, the balance is Al, and B:0.5(V+Mn+Ti+Cr) is 0.92, 10 Ca:(2Mg-Si) is 1.42, and Ni\Cu is 2.5.

[0087] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0088] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0089] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0090] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0091] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0092] The main mechanical properties of the standard specimens prepared as above are tested as follows: tensile strength 166 MPa, yield strength 120 MPa, and electrical conductivity 32.53 MS / m.

[0093] Comparative Example 3

[0094] The present invention provides an aluminum alloy material for a cast aluminum rotor of a high-speed asynchronous motor: the aluminum alloy material comprises: 0.5wt% Ni, 0.35wt% Fe, 0.5wt% Si, 0.39wt% Mg, 0.2wt% Cu, 0.018wt% B, 0.04wt% Ca, 0.35wt% Zr, 0.02wt% Sr, 0.02wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.039wt%, the balance is Al, and B:0.5(V+Mn+Ti+Cr) is 0.92, 10 Ca:(2Mg-Si) is 1.42, and Ni\Cu is 2.5.

[0095] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0096] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0097] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0098] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0099] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 280°C, the heating time to 3H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0100] The main mechanical properties of the standard specimens prepared as above are as follows: tensile strength 135 MPa, yield strength 107 MPa, and electrical conductivity 31.5 MS / m.

[0101] Comparative Example 4

[0102] The present invention provides an aluminum alloy material for a cast aluminum rotor of a high-speed asynchronous motor: the aluminum alloy material comprises: 0.5wt% Ni, 0.35wt% Fe, 0.5wt% Si, 0.39wt% Mg, 0.2wt% Cu, 0.018wt% B, 0.04wt% Ca, 0.35wt% Zr, 0.02wt% Sr, 0.02wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.039wt%, the balance is Al, and B:0.5(V+Mn+Ti+Cr) is 0.92, 10 Ca:(2Mg-Si) is 1.42, and Ni\Cu is 2.5.

[0103] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0104] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0105] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0106] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0107] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 370°C, the heating time to 4H, the cooling rate to 5°C / s, and the cooling time to 60s.

[0108] The main mechanical properties of the standard specimens prepared as above are tested as follows: tensile strength 140 MPa, yield strength 112 MPa, and electrical conductivity 30.6 MS / m.

[0109] Comparative Example 5

[0110] The present invention provides an aluminum alloy material for a cast aluminum rotor of a high-speed asynchronous motor: the aluminum alloy material comprises: 0.5wt% Ni, 0.35wt% Fe, 0.5wt% Si, 0.39wt% Mg, 0.2wt% Cu, 0.018wt% B, 0.04wt% Ca, 0.35wt% Zr, 0.02wt% Sr, 0.02wt% P, the overall content of V, Mn, Ti, and Cr is set to 0.039wt%, the balance is Al, and B:0.5(V+Mn+Ti+Cr) is 0.92, 10 Ca:(2Mg-Si) is 1.42, and Ni\Cu is 2.5.

[0111] The method for preparing the aluminum alloy material of the cast aluminum rotor of the high-speed asynchronous motor comprises the following steps:

[0112] S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain alloy melt. After the aluminum alloy materials are hot-melted, add aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium and aluminum phosphorus. Set the preheating temperature to 300-450°C, the hot melting temperature to 700-780°C, and the stirring time to 5-15 minutes.

[0113] S2. Refining the alloy melt to complete degassing and impurity removal, introducing protective gas into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of protective gas introduced is 0.15-6 L / min, and RJ-01 refining agent is added, and the refining time is 15-25 min, and the amount of refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt;

[0114] S3, sending the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product, and the casting molding is selected from centrifugal casting and high pressure casting

[0115] S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment. Heat the alloy melt with the furnace. Set the heating temperature to 530°C, the heating time to 3H, the cooling rate to 20°C / s, and the cooling time to 10s.

[0116] The main mechanical properties of the standard specimens prepared as above are tested as follows: tensile strength 128 MPa, yield strength 102 MPa, and electrical conductivity 29.5 MS / m.

[0117] Table 2 Comparison of mechanical properties of aluminum alloys using different heat treatment methods

[0118] It can be seen from Table 2 that, based on the components of Example 4, the heat treatment parameters are determined. It can be seen from Example 5, Comparative Examples 3, 4 and 5 that when the heating temperature is 280°C, the heating time is 6H, the cooling rate is 5°C / s, and the cooling time is 60s, the tensile strength, yield strength and electrical conductivity of the aluminum alloy reach the optimal values.

[0119] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-speed asynchronous motor cast aluminum rotor aluminum alloy material, characterized by: The aluminum alloy material composition includes: 0.3wt%~1.5wt%Ni, 0.2wt%~0.5wt%Fe, 0.2wt%~1.0wt%Si, 0.1wt%~0.8wt%Mg, 0.2wt%~1.0wt%Cu, 0.004wt%~0.05wt%B, 0.0025wt%~0.015wt%Ca, 0.15wt%~0.5wt%Zr, 0.005wt%~0.02wt%Sr, 0.0045wt%~0.025wt%P and V, Mn, Ti, Cr, and the balance is Al, and the overall content of V, Mn, Ti, and Cr is 0~0.05wt%; The mass relationship between V, Mn, Ti and Cr is: 0.3≤B:0.5(V+Mn+Ti+Cr)≤1.0; The mass relationship between Ca, Mg and Si is: 0.25≤10 Ca:(2Mg-Si)≤0.75; The mass relationship between Ni and Cu is: 。 2. The method for preparing an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor according to claim 1, characterized in that: This preparation method specifically comprises the following steps: S1. Select appropriate raw materials according to the formula of aluminum alloy materials for cast aluminum rotors, weigh, preheat, heat-melt and stir the materials according to the material components to obtain an alloy melt; S2, refining the alloy melt to complete degassing and impurity removal; S3, feeding the alloy melt into a casting molding device for casting to obtain a cast aluminum rotor product; S4. Send the cast aluminum rotor product to the heat treatment workshop for heat treatment.

3. The method for preparing the aluminum alloy material of the cast aluminum rotor of a high-speed asynchronous motor according to claim 2, characterized in that: In the step S1, after the aluminum alloy material is hot-melted, aluminum nickel, aluminum iron, magnesium ingot, copper, aluminum calcium, aluminum strontium, aluminum boron, aluminum zirconium, and aluminum phosphorus are added.

4. The method for preparing an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor according to claim 2, characterized in that: In the step S1, the preheating temperature is set to 300-450° C., the hot melting temperature is set to 700-780° C., and the stirring time is set to 5-15 minutes.

5. The method for preparing an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor according to claim 2, characterized in that: In the step S2, a protective gas is introduced into the alloy melt, wherein the protective gas is nitrogen or argon, and the amount of the protective gas introduced is 0.15-6 L / min. RJ-01 refining agent is added, and the refining time is 15-25 min. The amount of the refining agent added is 0.2wt%-0.5wt% of the mass of the alloy melt.

6. The method for preparing an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor according to claim 2, characterized in that: The casting in step S3 is selected from centrifugal casting and high pressure casting.

7. The method for preparing an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor according to claim 2, characterized in that: The heat treatment method of step S4 is: heating the alloy melt in the furnace, setting the heating temperature to 280°C, the heating time to 6H, the cooling rate to 5°C / s, and the cooling time to 60s; and after the alloy melt is heat treated, the tensile strength is greater than 160MPa, the yield strength is greater than 120MPa, and the electrical conductivity is greater than 32MS / m.

8. The use of an aluminum alloy material for a high-speed asynchronous motor cast aluminum rotor according to any one of claims 1 to 7, characterized in that: Aluminum alloy materials are used for cast aluminum rotors of high-speed asynchronous motors.

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