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It must be carried out in strict accordance with the corresponding aluminum extrusion process. During the start-up process, the temperature of the middle section of the aluminum rod furnace is set at 530-550 °C, and the temperature of the outlet section is set at 480-500 °C. The holding time is sufficient to ensure that the aluminum rod is warm enough. Through the heart (that is, the heart and the surface are warm enough), to avoid the increase of the elastic deformation of the mold due to the different temperature of the aluminum rod (the temperature of the core is insufficient), thereby aggravating the phenomenon of "biasing" and "long and short" Occurs even if the extrusion die is plastically deformed and scrapped.
The center of the extrusion tube, the center of the extrusion rod and the center of the mold base must be concentric, and no obvious eccentricity is allowed. Otherwise, the flow velocity of the product will be affected, and even the molding of the product or the difference between the lengths of the extruded product will be affected. Large and unable to squeeze production.
The double-hole special support pad of appropriate size must be selected to reduce the elastic deformation of the lower die, so that the extruded product is stable information and small in dimensional change; and the special support pad for the double hole must be ready for use before the mold is released, so as to prevent the mold from being released. Later, because the support pad was taken too long, the mold was cooled too much and the car was boring.
A: Information feedback of the extrusion die
B: Feedback of the forming condition
In addition to the clear material number of the extrusion die number, it is also necessary to mark the overall flow direction of the material head which is difficult to see on the material head, such as a, "intersection discharge" (indicating that it is two during the actual extrusion process) The inner side of the hole is slow and the outer side is fast); b, "phase separation and discharge" (indicating that the inner side of the two holes is slow and slow in the actual extrusion process); c, "left long and right short" means that the left branch is short and the right branch is short. And to indicate the amount of length difference, because the distance from the saw to the discharge port is about 6 meters, so the form of "A meters / 6 meters" usually means that the difference between the length and the length is about a meters every 6 meters, so that the accuracy is accurate.
C: Information feedback of oversize
In the case of normal forming of the material but the size is out of tolerance, a sample must be taken to complete the correct identification (extrusion die number, discharge direction, dimensional defects, etc.), and any one of the identification errors may result in The mold is fixed, so it must be highly noticed.
First, the material used to manufacture the molding die parts does not meet the requirements of working conditions, causing deformation, corrosion or severe wear of the mold after working for a period of time.
Second, when installing or disassembling the parts in the molding die, tap the parts with a hammer, causing deformation or smooth surface of the mold parts, and impact damage on the working surface.
Third, the splitter cone angle is too large, and the resistance to the flow of the melt is large, causing the splitter cone to be broken.
Forth, the hardness of the working surface of the 4-die and mandrel is low, which causes the surface of the clean surface to wear seriously, resulting in a rough surface.
Fifth, when adjusting the mold, if the working degree is wrong, the mold adjustment screw will be broken, and the die or sizing sleeve will be deformed and cannot be used.
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