Industrial Aluminum Profile heating and cooling speed
The heating rate is such that the ingot does not cause cracking and excessive deformation. The holding time of the holding time should ensure a certain annealing temperature, so that the non-equilibrium phase is dissolved and the segregation is removed within the crystal, but should be based on alloy characteristics, ingot size, segregation degree, shape and size and distribution of the second phase, heating equipment and temperature , To determine the length of the holding time.
Practice has proved that the rate of homogenization process with time, but by the large step by step. Therefore, excessive insulation time is not appropriate, will make the metal burning and energy consumption increase, reduce productivity. After the cooling rate is homogenized, the ingot may be cooled with the furnace or air cooled.
Industrial Aluminum Profile cooling rate of hard Aluminum Profile and so should not be too fast, so as to avoid quenching effect. The ingot homogenization annealing may be carried out separately or in combination with preheating heating. The ingot is heated to the homogenization annealing temperature, after a certain period of time to heat the hot rolling temperature, followed by hot rolling, both to reduce the process, but also save energy.
However, the industrial Aluminum Profile homogenization annealing temperature is high, long time and energy consumption, the composition is simple, segregation is not serious and good plastic alloy, do not have to be homogenized. General super-hard Aluminum Profile alloy, hard Aluminum Profile, forged Aluminum Profile and rust-proof Aluminum Profile are required to be homogenized annealing.
Resulting in Aluminum Profile hardness is too low a few factors to help you find the cause, as soon as possible to improve the hardness of industrial Aluminum Profile.
In fact, can affect the industrial Aluminum Profile hardness factors are many, a little bit of local attention may cause industrial Aluminum Profile hardness is too low. In this regard, Hua Jian that should be considered from the following aspects:
1, industrial Aluminum Profile temperature setting and control. Under normal circumstances, the actual temperature and the apparent temperature or there is a certain error, so we must set the table temperature according to the actual temperature of the furnace to set, and pay close attention to the temperature fluctuations.
2, industrial Aluminum Profile temporary insulation. In this regard we have to strictly in accordance with the requirements of the process to set the time limit, the insulation time to be appropriate to prevent the lack of time or over time due to the hardness of Aluminum Profile is not enough.
3, industrial Aluminum Profile extrusion frame can not be too dense, there should be between the material and the interval between the industrial Aluminum Profile, especially non-ventilated small material, thick material interval is greater, pipe material and small materials, sheet metal When assembling a frame, the tube is placed in such a way as to facilitate the regular circulation of the air.
Industrial Aluminum Profile heat treatment has four fire, respectively, annealing, normalizing, quenching and tempering.
Aluminum Profile heat treatment is the Aluminum Profile products in a certain medium to heat to the appropriate temperature, Aluminum Profile in this temperature to maintain a certain time, but also a different speed of cooling a process. Aluminum Profile heat treatment is one of the most important processes in the production of materials. Compared with other processes, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but by changing the internal microstructure of the workpiece or changing the workpiece Surface chemical composition, to give or improve the use of the workpiece performance. Which is characterized by improving the intrinsic quality of the workpiece, which is generally not visible to the naked eye.
Annealing refers to the heating of the workpiece to the appropriate temperature, according to the size of the material and the workpiece with different holding time, and then slow cooling, the main purpose is to reduce the hardness of the material to improve the plastic, in order to facilitate the subsequent processing to reduce residual stress, Organization and composition of the homogenization. Annealing is divided into recrystallization annealing according to the purpose, stress annealing annealing annealing, complete annealing and so on.
Analysis of industrial Aluminum Profile manufacturers, normalizing the workpiece is heated to the appropriate temperature in the air after cooling, normalizing effect similar to annealing, but get the organization more fine, often used to improve the cutting performance of materials, and sometimes for the right Some of the less demanding parts of the final heat treatment. Quenching is the workpiece after the heat insulation, in water, oil or other inorganic salts, organic water quenching medium in the rapid cooling. After quenching the material for the unbalanced organization, usually very hard and very brittle, need to be higher than room temperature at a certain temperature for a long time insulation, and then cooling, this process called tempering.
As can be seen from the above definition, industrial Aluminum Profile, whether it is annealing, normalizing, quenching or tempering, heat treatment process should be the workpiece heating, insulation and cooling. Therefore, Aluminum Profile heat treatment, heating speed, holding time and cooling rate of heat treatment process to become the most important process parameters.