Magnesium alloy automobile wheel extrusion molding method and mold

Abstract

The invention relates to a press forming method of magnesium alloy automobile wheels and a die thereof, the working procedures of the press forming method comprise: blanking-continuous upsetting-backward extrusion-machinery adding-forward extrusion-flaring-thermal treatment-ultimate machinery adding-superficial treatment; the press forming die comprises: a backward extrusion die, a forward extrusion die and a flaring die; the method of the invention can directly form magnesium alloy or aluminium alloy automobile wheels of various shapes, which solves the problem of hard forming of flanges of wheels and reduces the forming force, which particularly suitable for the magnesium alloy of low plasticity with hexagonal close packed lattice, three-direction compressive stress acquired from forward extrusion is beneficial to improve the plasticity of the material; the formed wheel has the advantages of high size precision and surface precision, good comprehensive mechanical property and simple die structure, which improves the quality of the product, simplifies technical process, decreases die frock and equipment and reduces production cost.

Description

1. Technical field [0001] The invention discloses a magnesium alloy automobile wheel extrusion forming method and a die, which is a magnesium alloy extrusion forming technology and belongs to the category of advanced metal material manufacturing technology. Mainly used for the forming of automobile wheels, it can also be applied to the forming of aluminum alloy automobile wheels and other vehicle wheels, and can also be widely used in the forming and manufacturing of various aluminum and magnesium alloy rings or disc-shaped parts. 2. Background technology [0002] With the rapid development of the global automobile industry, automobile lightweight has been put on the agenda. Lightweight structural materials (such as aluminum and magnesium alloys) show great advantages in automobiles, especially magnesium alloys, which are not only light in weight, high in specific strength, but also good in damping performance, and are good vibration-absorbing materials for manufacturing whe...

AI Technical Summary

Problems solved by technology

Obviously, the magnesium alloy wheel made by this method has good structure and mechanical properties, but its process is complicated, the equipment required is many, the investment is large, and the production cost is high

Moreover, for magnesium alloys with low plasticity of close-packed hexagonal lattices, the difficulty of swaging and rolling processes is increased.

[0006] Chinese patent ZL 03100893.3 discloses a casting-extrusion composite forming method for magnesium alloy automobile wheels. The casting process is used to make the required blanks, and the grain structure is refined through critical control deformation, which improves the mechanical properties and surface quality of magnesium alloy wheels. Reduced equipment; but the process is still relatively complicated, the forming force is large, and the required equipment pressure is relatively high

[0007] Chinese patent 200610012829.9 discloses a labor-saving forming method and device for automobile wheel hubs, and proposes a process of casting billet-homogenization treatment-preforming billet-extrusion-upsetting front wheel rim-flare and flanging rear wheel rim process, using hollow billet Extrusion significantly reduces the forming force, but the billet making process is complicated, the front wheel flange is difficult to form, and the spokes need to be finely shaped

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