Using a narrower range for the forging temperature of aluminum alloy, forging in a narrow temperature range, undoubtedly the alloy has good plasticity, less deformation resistance, and the obtained recrystallized structure is uniform and fine. What is the forging process of aluminum alloy?

Deformation speed does not have much effect on the plasticity of most aluminum alloys, but the plasticity of a few highly alloyed aluminum alloys decreases significantly when they are deformed at high speed. In addition, when transitioning from a low deformation speed to a high deformation speed, the deformation resistance becomes about 0.5-2.0 times larger with the degree of alloying of the alloy. Therefore, aluminum 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 degree of deformation and increase production efficiency, reduce deformation resistance and improve the fluidity of the alloy filling mold cavity, it is better to use press and die forging to forge aluminum alloy than hammer forging. This is especially true for large aluminum alloy forgings and die forgings.

When aluminum alloy is forged on a high-speed hammer, due to the large deformation speed, large internal friction and large thermal effect, the temperature rise (about 100 ℃) of the alloy during forging is more obvious. For this reason, the initial forging temperature of aluminum alloy should be adjusted, and the heating temperature of the blank before forging should be the lower limit of the original forging temperature. In addition, due to the large external friction coefficient of aluminum alloy and poor fluidity, if the deformation speed is too fast, it is easy to cause defects such as skinning, folding and uneven crystalline structure of the forging. For high-strength aluminum alloy with low plasticity, it is also easy to cause cracking of the forging. . Therefore, this type of aluminum alloy is more suitable for forging on a low-speed press.

Selecting a reasonable degree of deformation can ensure that the alloy does not crack during the forging process, and the deformation is uniform, and good structure and performance are obtained. In order to ensure that the aluminum alloy does not crack during the forging process, the allowable degree of large deformation during each blow or compression on the selected forging equipment should be determined according to the plastic map of the alloy.