Introduction
In a word, it boils down to having accurate analysis and judgment, as well as making appropriate adjustments to the metal flow rate.
The main tasks required in modifying the aluminum extrusion die are:
Adjusting the metal flow distribution ratio (by doing things like adjusting the size of the shunt hole or the diversion groove, adjusting the depth of the electro-erosion drainage groove, etc.), adjusting the contact friction coefficient, hindering interception, etc., and adjusting the length of the die hole working belt are some of the various methods that are utilized. Modifying the rate at which the metal flows out of the die hole in order to ensure that the metal flows out of the die hole in an even manner and that a product that is suitable for extrusion is created.
As a result, those who repair moulds need to be well-versed in the essential inspection procedures in order to be able to accurately identify and evaluate the factors that contribute to product flaws. This is necessary for aluminum extrusion alloy profiles to be able to effectively mend moulds.
The designer and manufacturer of the aluminum extrusion die determines the metal supply ratio.
When the mould is created, the proportion of the metal that is distributed to each cavity is essentially set in stone. The goal of appropriate distribution should be pursued by designers. If the distribution is inappropriate, the flow rate of each area of the wood finish aluminum profile will be uneven.
This will cause certain issues to arise during the repair of the mould, and in extreme circumstances, the mould may not even be repairable. Although the quantity of metal that will be discharged from the mould has already been calculated, the frictional resistance that exists between the metal and the mould may typically be adjusted. to accomplish the goal of achieving the desired adjustment of the metal flow rate.
The contact friction force that exists between the metal and the surface of the die, the contact friction force that exists between the working belts of the die hole, and the friction force that exists as a result of relative movement between the metal and the metal are the three components that make up the friction force that exists between the metal and the die.
Adjusting the flow rate of the metal may be accomplished by improving the frictional conditions that exist between the metal and the surface of the die. Altering the quantity of metal that is distributed throughout the die, the circumstances of the friction, the length of the working belt, and the speed at which the extrusion occurs are the variables that may be used to modify the speed at which the metal flows out of the die hole.
Die correction primarily focuses on adjusting the metal distribution ratio, contact friction conditions, and the length of the working belt of the die hole, in addition to other effective methods to change the flow characteristics of the metal. This ensures that the metal can flow out of the die hole evenly, which in turn results in the production of qualified aluminium profile products.
It is vital to investigate how to make the metal outflow speed of each area of the aluminium profile section constant so that flaws brought on by uneven metal flow may be avoided. This will allow for the defects brought on by uneven metal flow to be overcome. This is the fundamental idea that should be adhered to in mould design, and it is also the principle that mould repairers should adhere to.
Even though there are a great number of variables that contribute to the rate at which metal is extruded from the die hole, these variables may be broken down into two categories:
- Determine whether the flow of metal that is distributed across each component of the aluminium profile section is adequate.
That is, if the ratio of the metal flow of the corresponding supply portion is equal to the ratio of the cross-sectional area of each component of the aluminium profile.
- The amount of frictional resistance that is encountered while the metal is flowing. When a certain amount of metal is supplied to a particular part of the aluminium profile, the frictional resistance is proportional to the amount of metal that is supplied, and the faster the outflow speed of the die hole of this particular part of the aluminium profile, the smaller the amount of metal that is supplied.
