The extrusion temperature of industrial aluminum profiles is an important process parameter in the extrusion production process. In order to reduce the deformation resistance of the metal and reduce the extrusion pressure, it is necessary to increase the extrusion temperature of industrial aluminum profiles. However, when the extrusion temperature is increased to a certain temperature, thermal embrittlement is likely to occur, resulting in defects such as cracks. In order to avoid this phenomenon, in order to increase the extrusion speed, it is necessary to lower the extrusion temperature. These two conditions are contradictory. In order to reduce the deformation resistance while using a larger extrusion speed, a good metal plasticity temperature range needs to be selected.
However, in the extrusion production process of industrial aluminum profiles, the friction between the metal and the lining of the extrusion cylinder, the die, and the gasket, as well as the deformation of the metal itself, will increase the temperature of the metal, often destroying the intended extrusion. temperature range. The experimental results show that during the whole extrusion process, the extrusion temperature increases gradually, and the extrusion speed increases with the decrease of the metal content of the ingot. Therefore, due to the increase of extrusion temperature and the acceleration of extrusion speed, cracks often appear at the ends of industrial aluminum products. The increase of extrusion temperature during extrusion is related to the properties and extrusion conditions of industrial aluminum profiles. For industrial aluminum profiles, the temperature difference before and after ejection is between 10°C and 60°C.
In the extrusion process of industrial aluminum profiles, isothermal extrusion can be performed in order to keep the extrusion temperature within the temperature range where the metal has good plasticity. This is a new process that engineers and technicians have explored over the years. In order to achieve isothermal extrusion, automatic adjustment can be performed in all aspects of the extrusion process, such as the temperature of the ingot, the temperature of the extrusion tube can be heated gradiently, the mold can be cooled, the temperature can be adjusted, and the extrusion speed can be adjusted. It can be changed automatically, or isokinetic extrusion can be used. In addition, after changing the mold, due to the change of extrusion coefficient, the above conditions can also be adjusted accordingly.
Post time: Aug-03-2022