阅读说明：本技术 一种发电机底座 (Generator base ) 是由 华吉 华胜 于 2020-05-14 设计创作，主要内容包括：本发明属于车用机械领域,具体地涉及一种发电机底座及其制备方法。所述发电机底座使用铝合金制备而成,所述铝合金的成分按重量比例包括,Sc0.02～0.04％,Zr0.03～0.05％,Mg0.03～0.05％,Mn0.002～0.004％,Zn0.005～0.007％,Ti0.02～0.04％,Cr0.05～0.07％,余量为Al。制备包括步骤,按比例称量好的原料加入到熔炼装置中进行熔炼,熔炼后,将熔体浇入到结晶器中,结晶器通冷却水,并进行拉胚得到铸锭,铸锭经机加工后得到发电机底座。制备出来的铝合金壳体具有良好的耐磨和耐腐蚀性能,提高了整个车用外壳的使用寿命。(The invention belongs to the field of vehicle machinery, and particularly relates to a generator base and a preparation method thereof. The generator base is prepared from aluminum alloy, and the aluminum alloy comprises, by weight, 0.02-0.04% of Sc0.03, 0.03-0.05% of Zr0.03, 0.03-0.05% of Mg0.03, 0.002-0.004%, 0.005-0.007% of Zn0.02-0.04% of Ti0.02-0.04%, 0.05-0.07% of Cr0.05 and the balance of Al. The preparation method comprises the steps of adding raw materials weighed according to a proportion into a smelting device for smelting, pouring a melt into a crystallizer after smelting, introducing cooling water into the crystallizer, drawing a blank to obtain an ingot, and machining the ingot to obtain the generator base. The prepared aluminum alloy shell has good wear resistance and corrosion resistance, and the service life of the whole automobile shell is prolonged.)

1. A generator base, its characterized in that: the generator base is prepared from aluminum alloy, and the aluminum alloy comprises, by weight, 0.02-0.04% of Sc0.03, 0.03-0.05% of Zr0.03, 0.03-0.05% of Mg0.03, 0.002-0.004%, 0.005-0.007% of Zn0.02-0.04% of Ti0.02-0.04%, 0.05-0.07% of Cr0.05 and the balance of Al.

2. A generator base, its characterized in that: the preparation method of the generator base comprises the steps of adding raw materials weighed according to a proportion into a smelting device for smelting, wherein the Sc and Zr elements are Al-Sc alloy and Al-Zr alloy, heating to 200 ℃ to remove moisture, keeping the temperature at 200 ℃ for 1h, adding an aluminum ingot into the smelting device, heating to 760 ℃, removing a surface oxidation layer of a melt by using a stirring rod wrapped by aluminum foil, adding other raw materials, stirring until the raw materials are completely melted, keeping the temperature for 10-20 min, cooling to 720 ℃, removing the surface oxidation layer of the melt again, refining by using C2Cl6, degassing, removing slag, cooling to 700 ℃ and standing for 30-40 min, pouring the melt into a crystallizer, introducing cooling water into the crystallizer, pulling a blank to obtain an ingot, and processing the ingot by a machine to obtain the generator base.

3. A generator mount according to claim 2, wherein: the temperature of the crystallizer is stabilized at 700-710 ℃.

4. A generator mount according to claim 2, wherein: the diameter of the crystallizer is 120-125 mm.

5. A generator mount according to claim 2, wherein: a stable magnetic field is applied to the periphery of the crystallizer, the frequency is 2400-2500 Hz, and the power is 10 kv.

6. A generator mount according to claim 2, wherein: in the blank drawing process, the blank drawing is started when the melt pouring crystallizer reaches more than 50 mm.

7. The generator mount of claim 5, wherein: the blank drawing speed is 1.3-1.5 mm/s.

8. The generator mount of claim 5, wherein: the flow rate of the cooling water is controlled to be 0.6-0.8 t/h.

Technical Field

The invention belongs to the field of vehicle machinery, and particularly relates to a generator base and a preparation method thereof.

Background

The aluminum alloy has low density, high strength, good plasticity, excellent conductivity, heat conductivity and corrosion resistance. Aluminum alloys are the most widely used non-ferrous structural materials in industry and are used in a large number of applications in the aerospace, automotive, mechanical manufacturing, marine, aluminum alloy and chemical industries. Pure aluminum has a low density of about 1/3 that is iron, a low melting point of 660 ℃, and a face-centered cubic structure, so that the pure aluminum has high plasticity and is easy to process, various sections and plates can be manufactured, the aluminum alloy has good corrosion resistance, but the pure aluminum has low strength and is not suitable for being used as a structural material, and through long-term production practices and scientific experiments, people gradually add alloy elements and apply a heat treatment method to strengthen aluminum to obtain various aluminum alloys with different properties. The alloy formed by adding certain elements can have higher strength while keeping the advantages of light weight of pure aluminum and the like, so that the specific strength is superior to that of a plurality of alloy steels, the alloy becomes an ideal structural material and is widely applied to the aspects of mechanical manufacturing, transportation machinery, power machinery, aviation industry and the like, the airframe, the skin, the air compressor and the like of an airplane are usually made of the aluminum alloy to reduce the dead weight, the aluminum alloy is adopted to replace the welding of a steel plate material, and the structural weight can be reduced by more than 50%.

The generator base is used as a support and a stress point of the whole equipment, and is required to have good mechanical property and yield resistance and impact resistance, so that the common aluminum alloy cannot meet the requirements, and the aluminum alloy cast by a special process can meet the mechanical conditions of the use.

Disclosure of Invention

In order to solve the above problems, the present invention provides a generator base and a method for manufacturing the same.

The scheme provided by the invention is as follows:

the generator base is prepared from aluminum alloy, wherein the aluminum alloy comprises, by weight, 0.02-0.04% of Sc, 0.03-0.05% of ZrC, 0.03-0.05% of MgC, 0.002-0.004% of MnC, 0.005-0.007% of ZnC, 0.02-0.04% of Ti, 0.05-0.07% of CrC and the balance of Al.

The microstructure of the Al-Mg binary alloy is a coarse grain structure formed by a dendritic crystal structure; after Sc is added, the alloy structure has obvious thinning effect. However, when Sc and Zr are added simultaneously, the alloy produces a significant grain refining effect and the degree of structure refinement is better than when Sc is added alone. Due to the addition of Sc and Zr alloy elements, primary Al can be preferentially formed in the aluminum alloy melt in the process of solidification₃(Sc, Zr) particles which are effective in subsequent solidificationOn the other hand, during subsequent deformation or hot working, the supersaturated solid solution containing Sc and Zr alloy elements can decompose to form Al of nanometer scale₃The (Sc, Zr) particles, which are in coherent relation with the matrix, can effectively pin dislocation and subboundary, simulate the movement of the boundary, generate strong substructure strengthening and dispersion strengthening effects, and further greatly improve the strength of the alloy. Therefore, the comprehensive performance of the aluminum alloy can be greatly improved by adding trace Sc and Zr alloy elements into the aluminum alloy.

A generator base is prepared by the steps of adding raw materials weighed according to a proportion into a smelting device for smelting, wherein Sc and Zr are derived from Al-Sc alloy and Al-Zr alloy, heating to 200 ℃ to remove moisture, keeping the temperature at 200 ℃ for 1h, adding an aluminum ingot into the smelting device, heating to 760 ℃, removing a surface oxide layer of a melt by using a stirring rod wrapped by aluminum foil, adding other raw materials, stirring until the raw materials are completely melted, keeping the temperature for 10-20 min, cooling to 720 ℃, removing the surface oxide layer of the melt again, refining by using a C2Cl6 machine, degassing, slagging, cooling to 700 ℃ and standing for 30-40 min, pouring the melt into a crystallizer, introducing cooling water into the crystallizer, pulling a blank to obtain an ingot, and machining the ingot to obtain the generator base.

After the electromagnetic field is applied, the liquid metal is forcedly solidified by water cooling in a state where the free surface is maintained. Therefore, the cast ingot surface is bright and has no defects of cold shut, segregation tumor, pulling, scratching and the like, the surface milling can be reduced or even not be carried out before further processing, and the dendritic crystal is easy to break to form a large amount of new crystal nuclei to refine the crystal grains. The mechanical property, particularly the rolling property, of the coarse grain belt material which appears near the surface layer of the continuous casting ingot is eliminated, and the density and the hardness of the cross section of the ingot are increased.

Further, the temperature of the crystallizer is stabilized at 700-710 ℃.

Furthermore, the diameter of the crystallizer is 120-125 mm.

Furthermore, a stable magnetic field is applied to the periphery of the crystallizer, the frequency is 2400-2500 Hz, and the power is 10 kv.

Further, in the blank drawing process, the blank drawing is started when the melt casting crystallizer reaches more than 50 mm.

Further, the blank drawing speed is 1.3-1.5 mm/s.

Furthermore, the flow rate of the cooling water is controlled to be 0.6-0.8 t/h.

The invention has the advantages that: the prepared aluminum alloy shell has good wear resistance and corrosion resistance, and the service life of the whole automobile shell is prolonged.

Detailed Description