Aluminum alloy forging-aluminum alloy is the most widely used non-ferrous metal data in industry, which has been widely used in aviation, aerospace, car, machinery manufacturing, shipbuilding and chemical industry.

The strength of pure aluminum is very low, and the σb value of annealed state is about 8kgf/mm2, so it is not suitable for structural data. After long-term production practice and scientific experiments, everyone gradually strengthened aluminum by taking part in alloying elements and using heat treatment, and a series of aluminum alloys were obtained. The alloy composed of certain elements can have high strength while adhering to the advantages of pure aluminum and light weight, and the σb value separation can reach 24 ~ 60 kgf/mm2. This makes its "specific strength" (the ratio of strength to specific gravity σb/ρ) better than many alloy steels, and becomes an ideal structural data, which is widely used in machinery manufacturing, transportation machinery, power machinery and aviation industry. The fuselage, skin and compressor of aircraft are often made of aluminum alloy to reduce their own weight. Using aluminum alloy to replace the welding of steel plate data can reduce the structural component by more than 50%. Aluminum alloy has low density, but its strength is relatively high. It is close to or superior to high-quality steel, and has good plasticity. It can be processed into various machines, and has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to that of steel.

Forging stress of aluminum alloy forging

Forging stress of aluminum alloy forging includes thermal stress, transformation stress and contraction stress. The causes of various stresses are different

(1) Thermal stress. The thermal stress is caused by the uneven thickness of the cross section at the intersection of the casting shape and the cooling difference. Compressive stress is formed at the thin wall, resulting in residual stress in the casting.

(2) Phase transformation stress. The phase transformation stress is due to the phase transformation of some cast aluminum alloys during the cooling process after agglutination, which brings about the change of volume and size. What is important is that the wall thickness of aluminum castings is uneven, and different parts produce phase transformation in different time.

(3) Compressive stress. When aluminum castings are contracted, they are blocked by molds and cores, resulting in tensile stress. This stress is temporary, and the aluminum casting will dissipate voluntarily when it is unpacked. However, if the unpacking time is not appropriate, it will often cause thermal cracks, especially when the aluminum alloy cast in metal mold is under this stress.

The residual stress in cast aluminum alloy reduces the mechanical properties of the alloy and affects the machining accuracy of the casting. Residual stress in aluminum castings can be eliminated by annealing treatment. Because of its good thermal conductivity, the alloy has no phase change during the cooling process. As long as the casting layout plan is reasonable, the residual stress of aluminum castings is usually small.

What should be paid attention to in the process of forging aluminum alloy?

Aluminum alloy forging is an object in which metal exerts pressure and plastic deformation to shape the requested shape or appropriate shrinkage force. The end of this kind of pneumatic paradigm is achieved by hammer or pressure. During the casting process, exquisite grain structure was built and the physical properties of metal were improved. In the imaginary use of parts, a correct imagination can make particles flow in the target purpose of main pressure.

Aluminum alloy forging requires each piece to be divergent without any porosity, extra space, inclusions or other defects. The components consumed by this method have a high ratio of strength to weight. These components are commonly used in aircraft structures.

Aluminum alloy forging reminds us that aluminum forgings can stretch in length and shrink in cross section; Contractible length, extensible cross section; A changeable length, a changeable cross section. Therefore, it is widely influenced in all walks of life and is suitable for machinery, metallurgy, engineering and other fields.

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