The shape and size of the picture frame aluminum extrusion profile is the most important technological factor to determine the technical indicators in the whole aluminum extrusion process. The original condition to determine the shape and size of the picture frame aluminum extrusion profile is the specified shape and size of the extruded aluminum profile. Obviously, in all cases, it is the most reasonable to use the embryo with the largest volume. When selecting the shape, cross-sectional dimension and length of the embryo, the quality of the extruded aluminum profile should be ensured to be excellent (the geometric dimension accuracy is the highest, and the allowable deformation nonuniformity is the smallest), the allowable stress and total pressure of the aluminum extrusion tool (according to the mechanical characteristics of the extruder It depends. It has more cross-section shape of extrusion products. The blank can be either circular section or rectangular section. In order to reduce the non-uniformity of mechanical properties of extruded products, the minimum allowable extrusion coefficient should be ensured after filling and extrusion of the cross-sectional area of the picture frame aluminum profile.
In lubrication extrusion, the length of the billet has no effect on the quality of extruded aluminum profile, and the mechanical conditions have little relationship with the length of the billet. Therefore, it is better to use the billet from the factory as much as possible.
In the process of unlubricated extrusion, with the growth of picture frame aluminum extrusion profile, the non-uniformity of deformation increases. In addition, under this condition, with the increase of blank length, the extrusion pressure consumed to overcome friction increases. However, if the length of ingot is shortened, the amount of specific metal consumed on the extruded scrap will increase. According to the above points, the reasonable length of the blank should be considered to carry out aluminum extrusion.
