A kind of preparation method of aluminum alloy for electric bicycle rim

Abstract

The invention discloses a preparation method of aluminium alloy for an electric bicycle wheel rim. The aluminium alloy comprises components of, by weight: 1.5-2.5 parts of Si, 1.5-2.5 parts of Cu, 2.0-3.2 parts of Mg, 0.4-0.8 part of Zn, 0.2-0.6 part of Ti, 0.35-0.50 part of Zr and the balance of aluminium and inevitable impurities. The preparation method comprises steps of melting, refine, casting, homogenization treatment and extruding. Because of synergism of each alloying element, the aluminium alloy prepared by the invention has high strength, good elongation percentage, low natural ageing effect and good welding performance. After extruding, the aluminium alloy of the present invention has a tensile strength no less than 450 MPa, a yield no less than 400 MPa and an elongation percentage no less than 8%; besides, the aluminium alloy has good processing molding performance and can completely satisfy usage need of the electric bicycle.

Description

technical field [0001] The invention relates to the field of electric bicycles, in particular to a method for preparing an aluminum alloy for electric bicycle rims. Background technique [0002] Electric bicycles are faster than ordinary bicycles, more flexible to use than automobiles, and adapt to a wider range of roads. Therefore, electric bicycles have become an important means of transportation for people to travel. At present, there are a large number of electric bicycles in my country, and people are also improving the performance of electric bicycles. The more important improvements involve further reducing energy consumption and increasing the mileage of a single charge. Most of these studies involve the improvement of rechargeable batteries. [0003] Another important aspect is that starting from the material of the car body, reducing the weight of the car body can also save energy, thereby increasing the mileage of a single charge. The main structure of tradition...

AI Technical Summary

Problems solved by technology

If the solution heat treatment is not carried out, cracking will occur due to insufficient plasticity during the punching and embossing process. Even if there is no cracking, the phenomenon of orange peel will occur on the surface due to the decrease in plasticity, which will seriously affect the appearance.

If the solid solution is carried out again, the cost will inevitably increase and the production efficiency will be low. At the same time, the disappearance of the extrusion effect after solid solution will cause performance degradation.

[0005] If the extrusion outlet temperature is lower than the quenching point temperature, so that the material cannot be fully quenched, it means that the temperature of the extruded rod must be reduced, resulting in a sharp increase in extrusion pressure, a sharp drop in extrusion speed, a decrease in efficiency, and easy damage to the extrusion cylinder and extrusion dies

And because the optimum quenching temperature is not obtained in the extrusion process, it must undergo solid solution in the subsequent processing to exert the properties of the alloy

[0006] To sum up, according to the existing aluminum alloy materials, no matter what kind of process is adopted, the production efficiency will inevitably be low, and at the same time, the material properties cannot be fully utilized.