[China Aluminum Network] In order to repair aluminum extrusion dies, in addition to the correct analysis and judgment, it is also necessary to reasonably adjust the flow rate of the metal.
We start with the main job of extruding the mold. The main work of the extrusion die correction is to adjust the proportion of metal flow distribution (such as: the size of the diversion hole or diversion trough, the depth adjustment of the electrolytic corrosion drainage trough, etc.), adjust the contact friction coefficient, and block the interception method (such as: Barrier barriers, etc.) and adjustment of the length of the die hole work belt and other methods to change the speed of metal out of the die hole, so that the metal evenly out of the die hole to produce a qualified extruded product. Therefore, the mold repair personnel must master the relevant inspection techniques to correctly analyze and judge the cause of product defects, and thus perform effective mold correction.
Next is the proportion of metal supply, which is mainly determined by the mold designer and manufacturer. When the mold is manufactured, the proportion of metal is basically fixed. Designers must strive for a reasonable distribution. If the distribution is unreasonable, the flow velocity in the various parts of the profile will be uneven, which will cause difficulties in repairing the mold, and even if it is severe, it will not be possible to repair the mold. For most molds, the frictional resistance between the metal and the mold can be changed, although the metal distribution has been determined. In order to achieve the purpose of adjusting the metal flow rate. The friction between the metal and the mold consists of three parts: the contact friction between the metal and the die face, the contact friction between the die hole working tape, and the friction between the metal and the metal. Improve the metal and mold surface friction conditions, can play a role in adjusting the metal flow rate. Changing the amount of metal dispensed, the friction conditions, the length of the working belt, and the squeezing speed can adjust the speed at which the metal flows out of the die hole. The mold modification mainly focuses on adjusting the metal distribution ratio, contact friction conditions, and the length of the die hole working belt to perform various effective methods to change the flow characteristics of the metal, so that the metal evenly flows out of the die hole and produces a qualified profile product. In order to overcome the defects caused by the uneven flow of metal, it is necessary to study how to make the metal flow rate at each section of the profile uniform. This is the principle that mold design should follow, and it is also the basic principle that molders follow. Although there are many factors influencing the velocity of metal flowing out of the die hole, it can be summarized as two basic factors: a. Is the metal distribution flow rate suitable for each part of the profile section supplied? That is, the ratio of the ratio of the cross-sectional area of ​​each part of the profile to the metal flow of the corresponding supply part is equal; b. The magnitude of the frictional resistance when the metal flows, when the amount of metal in a certain part of the supply profile increases, the frictional resistance becomes smaller. The faster the outflow rate of this part of the die hole is, the slower it is.
Only with the above requirements can we have aluminum extrusion dies.
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