What is the forging process of aluminium alloy
Release time:
2021-04-19
The forging temperature of aluminium alloy adopts a narrower range, forging in a narrower temperature range, no doubt the alloy has good plasticity, small deformation resistance, and the obtained recrystallization structure is uniform and fine. What is the forging process of aluminium alloy?
The forging temperature of aluminium alloy adopts a narrower range, forging in a narrower temperature range, no doubt the alloy has good plasticity, small deformation resistance, and the obtained recrystallization structure is uniform and fine. What is the forging process of aluminium alloy?
The deformation speed of most of the aluminium alloy plasticity does not have much influence, only the individual high alloyed aluminium alloy in high speed shape, the plasticity decreased significantly. In addition, when the transition from low deformation rate to high deformation rate, the deformation resistance increases by about 0.5 -2.0 times with the alloying degree of the alloy. Therefore, the aluminium alloy forging can be carried out either at a low deformation speed or at a high deformation speed. However, in order to increase the allowable deformation degree and improve the production efficiency, reduce the deformation resistance and improve the fluidity of the alloy filling mold cavity, it is better to use a press and die forging to forge aluminium alloy than hammer forging. This is especially true for large aluminium alloy forgings and die forgings.
When the aluminium alloy is forged on the high-speed hammer, the deformation speed is very large, the internal friction is very large, and the thermal effect is also large, so that the temperature rise (about 100 ℃) of the alloy during forging is more obvious. For this reason, the starting forging temperature of aluminium alloy should be adjusted, and the heating temperature of the blank before forging should be the lower limit of the original starting forging temperature. In addition, due to the large external friction coefficient of aluminium alloy and poor fluidity, if the deformation speed is too fast, it is easy to cause defects such as peeling, folding and uneven crystal structure of the forging. For high-strength aluminium alloy with low plasticity, it is also easy to cause forgings. Cracking. Therefore, this kind of aluminium alloy is more suitable for forging on the low speed press.
The reasonable degree of deformation can ensure that the alloy does not crack during the forging process, and the deformation is uniform, and good organization and performance are obtained. In order to ensure that the aluminium alloy does not crack during the forging process, the degree of deformation allowed for each blow or compression on the selected forging equipment should be determined according to the plasticity diagram of the alloy.
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