Factors affecting the size of aluminum profile（一）

1. Temperature

The melting point of 6000 series aluminum alloy is about 660 °C, and softening occurs at 560 °C, at which time the viscosity is greatly increased and the extrusion is not conducive to extrusion.

Mold temperature: 420 °C ~ 500 °C

Extrusion temperature: 450 °C ~ 510 °C

Barrel temperature: 350°C-400°C

The temperature of the hollow mold / solid mold，Control the upper/lower limit values described above, respectively

During the extrusion process, due to the friction between the metal and the inner lining of the extrusion cylinder, the mold, the gasket, and the deformation of the metal itself, the temperature of the metal will increase, and it will often break through the extrusion temperature range selected in advance. Experiments have proved that the extrusion temperature is gradually increased during the entire extrusion process, and the extrusion speed gradually increases with the reduction of the ingot metal. Therefore, the phenomenon of cracks occurring at the tail end of the product is often caused by the increase of the extrusion temperature and the acceleration of the extrusion speed. The increase in extrusion temperature during extrusion is related to the nature of the alloy and the extrusion conditions. For aluminum alloys, the temperature difference between the metal before and after the mold outlet is between 10 and 60 °C.

In order to keep the extrusion temperature constant within the temperature range with the best plasticity of the metal, it is best to implement isothermal extrusion.