On 2018-08-08 14:48:54
Annealing furnace for aluminum coil heat treatment
Aluminum coil annealing furnace is mainly used for heat treatment of metal equipment, which can adapt to the heat degree of process production line and guarantee the processing quality. Today, we mainly analyze its characteristics and common problems.
Function of aluminum coil annealing furnace:
1. Reliable sealing
The annealing furnace not only inherits the advantages of the traditional annealing furnace, such as compact structure and convenient operation, but also has the characteristics of reliable sealing. It adopts integral pouring and has no gap in the furnace.
2. Safety and stability
Each burner is equipped with an independent and complete combustion controller, with automatic ignition, flame detection, fire alarm and automatic gas cut-off. In this way, the stability and safety of the combustion temperature control system of the aluminum coil annealing furnace can be fully guaranteed.
3. High efficiency and energy saving
Users feedback that the furnace has a high utilization rate of charging, can load and unload a large number of annealed workpieces at a time, and greatly saves energy.
4. Strong and durable
The annealing furnace is made of high-strength non stick aluminum castable, which can increase the overall strength, wear resistance and thermal shock stability, and greatly extend the service life of the furnace.
5. Wide use
In addition to reducing the hardness and softening the workpiece, the furnace can refine the grains, improve the mechanical properties of the workpiece, and reduce the deformation, cracking or crack inclination of the workpiece.
Analysis of common problems of aluminum coil annealing furnace:
1. Whether the annealing temperature reaches the specified temperature
In terms of technology, solution heat treatment is generally adopted, which is commonly known as "annealing", and the temperature range is 1040 ~ 1120 ℃. It can be observed through the observation hole of the annealing furnace that the stainless steel pipe in the annealing area shall be in incandescent state, but there is no softening and sagging.
2. Annealing atmosphere
Generally, pure hydrogen is used as annealing atmosphere. The purity of the atmosphere is more than 99.99%. If the other part of the atmosphere is inert gas, the purity can be a little lower, but it must not contain too much oxygen and water vapor.
3. Tightness of furnace body
The aluminum coil annealing furnace shall be closed and isolated from the outside air; if hydrogen is used as the protective gas, only one exhaust port is open. The inspection method can be applied to the joints of the annealing furnace with soapy water to see if there is gas leakage. The most easy place to gas leakage is the place where the annealing furnace enters the pipe and the place where the pipe exits. The sealing ring in this place is particularly easy to wear, so it should be inspected and replaced frequently.
4. Protection gas pressure
In order to prevent micro leakage, the protection gas in the furnace shall be kept at a certain positive pressure. If it is hydrogen protection gas, it is generally required to be more than 20kbar.
5. Water vapor in furnace
On the one hand, check whether the furnace body material is dry. When the furnace is installed for the first time, the furnace body material must be dried; on the other hand, check whether there is too much water stain on the stainless steel pipe entering the furnace, especially if there is hole on the pipe, do not leak in, otherwise the atmosphere of the furnace will be completely destroyed. If there are no such problems, the stainless steel pipe that should be retreated about 20 meters after opening will start to shine, which is the kind of light reflecting.