Determination of extrusion ratio and deformation degree during extrusion of aluminum profile extrusion press machine plant line
In the extrusion process of aluminum profile extrusion press machine plant line, extrusion ratio and deformation degree are two basic deformation parameters of the extrusion process, which can explain the amount of metal deformation in the extrusion process. During extrusion, increasing the degree of deformation can refine the grain of the product and improve its mechanical properties.
When selecting the deformation parameters of the extrusion process of the extruder aluminum equipment, when the extrusion temperature range is determined, with the increase of the extrusion ratio, the temperature and speed of the products flowing out of the die hole are increased, in order to avoid the surface roughness and extrusion crack of the extruded products, the appropriate extrusion ratio should be selected.
According to the structure and performance requirements of extruded products, in order to obtain higher mechanical properties, should try to choose a large extrusion ratio for extrusion, the general degree of deformation can be taken more than 90%, the extrusion ratio should not be less than 10-- 120; According to the extrusion pressure is proportional to the logarithm of the extrusion ratio, the extrusion ratio of Z is limited by the extrusion pressure of the extruder and the strength of the extrusion tool. When choosing the extrusion ratio, it can not exceed the capacity of the aluminum equipment.
When the extruder is extruding the blank used for secondary extruding, the extrusion ratio can be unlimited. When extruding the small section and profile, in order to make the metal flow uniform, the multi-die hole extrusion can be used to reduce the extrusion ratio. In the actual operation process, once it is found that the extrusion machine clamping extrusion shaft, we should pay attention to the stress parts, must be plane contact.
When pressing on the extrusion machine, manually control the slow pressure and control the pressure is not too high, observe the extrusion shaft move out of the situation. If you can't push, you can't push hard, analyze the problem and take measures to deal with it in accordance with certain methods, so that the extruder can return to normal as soon as possible.