Main repair methods for aluminum extrusion dies
The main repair methods for aluminum extrusion dies require mold repairers to: correct analysis and judgment, and reasonable adjustment of metal flow rate. The mold repairer must be proficient in the relevant inspection techniques in order to properly analyze and judge the cause of the defects of the product, so as to carry out effective mold correction.
Main contents of aluminum profile extrusion die correction
Adjust the metal flow distribution ratio (such as: mold split hole or guide groove size adjustment, electro-erosion drain groove depth adjustment, etc.), adjust contact friction coefficient, hinder interception and other methods (such as: block obstruction, etc.) and adjust the die hole Various methods, such as the length of the working belt, are used to change the speed at which the metal flows out of the die hole, thereby allowing the metal to uniformly flow out of the die hole to produce a qualified extruded product.
The proportion of metal supply is mainly determined by the mold designer and manufacturing. When the mold is manufactured, the metal distribution ratio is basically fixed. Designers must strive for a reasonable allocation. If the distribution is unreasonable, the flow rate of each part of the profile is not uniform, which brings certain difficulties to the mold repair. In severe cases, it is impossible to repair the mold. For most molds, although the metal distribution 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 face, the contact friction between the die working tape, and the friction between the metal and the metal. Improving the frictional conditions between the metal and the die surface 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 extrusion speed all adjust the speed at which the metal exits the die orifice.
The mold correction mainly focuses on adjusting the metal distribution ratio, the contact friction condition and the length of the die hole working belt, and other effective methods to change the flow characteristics of the metal, so that the metal uniformly flows out of the die hole to produce 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 outflow speed of each part of the section of the profile uniform, which is the principle that the mold design should follow, and also the basic principle followed by the molder. Although there are many factors that affect the rate at which metal exits the die hole, it can be summarized into two basic factors:
a. Whether the metal distribution flow rate of each part of the profile section is suitable. That is, whether the ratio of the sectional area of ​​each part of the profile to the metal flow rate of the corresponding supply part is equal;
b. When the metal flows, the amount of frictional resistance, when the amount of metal in a part of the profile is increased, the smaller the frictional resistance, the faster the outflow speed of the part of the profile hole, and vice versa.
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Label: Main repair methods for aluminum extrusion dies
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