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How to repair aluminum extrusion dies? Hunan Longfeng Aluminum Co., Ltd. gives you a brief introduction through the following articles:
The main contents of aluminum profile extrusion die modification include: adjusting the proportion of metal flow distribution (such as: size adjustment of die diverter hole or diversion slot, depth adjustment of electric erosion drainage slot, etc.), adjustment of contact friction coefficient, and obstruction of interception. Such as: blocking the base, etc.) and adjusting the length of the working belt and other methods to change the speed of metal out of the mold hole, so that the metal evenly out of the mold hole, to produce qualified extrusion products. 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.
The distribution ratio of metal supply is mainly determined by the mold designer and manufacturing. 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, although the amount of metal dispensed has been determined, the frictional resistance between the metal and the mold can be changed 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 surface, the contact friction between the die hole working belt, 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 all 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 that affect the speed at which metal flows out of the die hole, it can be summarized as two basic factors:
a. Is it appropriate to distribute the flow of metal to all parts of the profile? That is, the ratio of the ratio of the cross-sectional area of ​​each section of the profile to the metal flow of the corresponding supply section is equal;
b. When the metal flows, the magnitude of the frictional resistance is affected. When the amount of metal in a certain part of the supply profile increases, the frictional resistance is smaller, the faster the outflow speed of the die hole in this part of the profile, and vice versa.
How to repair aluminum extrusion dies is summarized as follows: correct analysis and judgment, and reasonable adjustment of metal flow rate.
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