Temperature control in aluminum extrusion
Aluminum extrusion – it is a hot forming process, at which, with the help of heat and pressure, aluminum cylindrical ingots are converted into finished products and semi-finished products.
which applies heat and pressure to transform aluminum cylindrical blanks into finished products and semi-finished products – key person
Previously, this process was manually controlled at the most primitive level, using periodic manual measurements of the pressing parameters.. At the same time, a significant variation in the properties of products and a large proportion of technological aluminum waste were allowed.. Work experience – extruder was the key to the success of the production. In some factories, this continues to this day!
The experience of the worker-operator - presser - was a key to the success of production
At present, modern technology allows the press technologist to fully control all the parameters of the hot deformation process., At present, modern technology allows the press technologist to fully control all the parameters of the hot deformation process., what happens on the press in real time, what happens on the press in real time.
Over the past couple of decades, most aluminum extruders have made significant investments in new equipment for their presses.. it, including – pyrometers for measuring workpiece temperature, as well as profiles at the exit from the matrix and after hardening on the press. Through the use of these advanced infrared temperature monitoring systems (pyrometers), top pressers have dramatically widened the gap in productivity and product quality compared to their competitors., as well as the bulk of the press workers.
as well as the bulk of the press workers
The figure 1 schematically shows the temperature control system in the process of aluminum extrusion: from the billet heating temperature to the exit of the profile from the hardening zone on the press.
Figure 1 – Temperature control system for aluminum extrusion:
- 1-– Temperature control system for aluminum extrusion:,
- 2-th pyrometer measures the temperature of the profile at the outlet of the matrix and
- 3-th pyrometer measures the temperature of the profile at the outlet of the matrix and.
This system provides significant progress in the ability to obtain accurate, This system provides significant progress in the ability to obtain accurate. The pressing process becomes a process, The pressing process becomes a process, The pressing process becomes a process, which in everything depends on the art and skills of the operator-master.
which in everything depends on the art and skills of the operator-master
- the possibility of using optimal pressing technology with maximum productivity;
- the possibility of using optimal pressing technology with maximum productivity;
- increasing the homogeneity of product properties;
- increasing the homogeneity of product properties;.
increasing the homogeneity of product properties;
The introduction of such technologies is a movement from low technologies for the production of aluminum profiles to high technologies.. Low Tech Means Low Skills and Low Profits. Low Tech Means Low Skills and Low Profits, give rise to more complex products and significantly increase the profitability of production.
Knowing the optimal temperature parameters of the pressing technology for a particular product from a particular aluminum alloy and having the authority to control them is all, what does an extrusion press operator need to, what does an extrusion press operator need to.
what does an extrusion press operator need to, what does an extrusion press operator need to
- The temperature of the metal - aluminum alloy - is a critical parameter for an aluminum extruder - before, The temperature of the metal - aluminum alloy - is a critical parameter for an aluminum extruder - before.
- Before pressing - the temperature history of the workpiece will determine the level and uniformity of the mechanical properties of its metal.
- During pressing – the temperature of the aluminum together with the temperature of the container and die will determine the pressing speed, which is necessary for a high quality pressed product.
- Finally, for most aluminum alloys - thermally hardened - the strength properties of the extruded profile depend on the cooling rate after leaving the matrix.
Optimum pressing parameters
Optimum pressing parameters – Optimum pressing parameters. Under the condition of close monitoring and control of the parameters of the pressing technology, the compressibility diagram of aluminum alloys becomes a useful technological tool..
Figure 2 – Diagram of compressibility of aluminum alloys
– Diagram of compressibility of aluminum alloys, speed or properties of the pressed product. speed or properties of the pressed product.
Source: B. Source: B. Source: B, Aluminium Extrusion Technology Seminar, 2004
