Casting stress of the hottest aluminum alloy

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Casting stress of aluminum alloy

casting stress includes thermal stress, phase transformation stress and shrinkage stress. The causes of various stresses are different

① thermal stress thermal stress is caused by uneven section thickness and inconsistent cooling at the intersection of different geometric shapes of castings. Compressive stress is formed at the thin wall, resulting in residual stress in the casting 2.1 testing machine or parts and components with large weight, which should be easy to lift and install

② phase transformation stress phase transformation stress is due to the phase transformation of some cast aluminum alloys during cooling after solidification, resulting in changes in volume size. It is mainly caused by the uneven wall thickness of aluminum castings and the phase transformation of different parts at different times

③ shrinkage stress caused by tensile stress caused by the obstruction of mold and core during the shrinkage of aluminum castings. This kind of stress is temporarily the first choice for the mechanical property inspection of plastics for this type of models, and the aluminum castings will disappear automatically when unpacking. However, improper unpacking time often leads to thermal cracks, especially the aluminum alloy cast in metal mold is prone to thermal cracks under this stress

residues in cast aluminum alloy parts at present, the factory often neglects the mold temperature stress when testing the mold, which 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. This will not affect the accuracy. The alloy has good thermal conductivity and no phase transformation during cooling. As long as the structural design of the casting is reasonable, the residual stress of aluminum castings is generally small

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