The life of aluminum extrusion die has become the main bottleneck in the development of aluminum profile industry in China. The design and manufacturing cost of aluminum extrusion die accounts for about 20% of the total production cost. It is one of the key technologies for the aluminum extrusion industry with many variables and rapid development. It involves materials, design, manufacturing, testing, mold repair and management. Many links are also one of the areas with great development potential.
How to use this kind of mold more rationally, we can start from the following aspects.
(1) Strict implementation of aluminum profile production process regulations
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.
(2) Ensuring "three hearts in one"
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 length of the extruded product will be affected. Large and unable to squeeze production.
(3) Reasonable use of support pads
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 in formation 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. After that, because the support pad is too long, the mold is cooled too much and the car is boring; (4) Strengthening the feedback of the aluminum extrusion process
A: Information feedback of the extrusion die
There are many reasons for plugging molds. It is generally difficult for people without special training to express clearly. It is best to go through the corresponding mold repairers and find out the reasons before they can be modeled.
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. The expression is conducive to the correct judgment and maintenance of the molder.
C: Information feedback of the size difference:
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.
Only such complete feedback on the use situation will be beneficial to the correct judgment and maintenance of the molder, in order to improve the efficiency of mold repair, and to reduce the number of mold repairs and unnecessary test.
Concerned about surprises
Label: points of use of aluminum extrusion die
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