Aluminum layer heat treatment process for acoustic board

Abstract

The invention relates to an aluminum layer heat treatment process for an acoustic board, comprising three stages of temperature rise, heat preservation and cooling. The aluminum layer heat treatment process is characterized by comprising the following steps of: (1) uncoiling and cutting a thin aluminum layer, stacking the cut thin aluminum layers, placing the stacked thin aluminum layers into a heat treatment furnace and allowing the aluminum layer to raise the temperature along the maximum power of a furnace to be 290-480DEG C; (2) carrying out the heat preservation on the thin aluminum layer subjected to temperature rise for 30-60 minutes; and (3) cooling the thin aluminum layer subjected to the heat preservation in the step (2) along the furnace to be 130-160DEG C and opening a furnace door for air cooling, reducing the strength and the elongation percentage of the material and softening the thin aluminum layer so as to meet the requirements that the thin aluminum layer is extruded by an aluminum plate net in the rolling press process to naturally crack and the sound wave can transmit through.

Description

technical field [0001] The invention relates to a metal material heat treatment process, in particular to an aluminum layer heat treatment process. Background technique [0002] The noise problem of substation (converter station) has always been a hot spot for surrounding residents to complain to the environmental protection department. With the promotion of UHV power transmission and transformation technology, the noise problem of the supporting substation (converter station) has become more serious than ever, and has caused petitions and mass incidents to increase day by day. [0003] At present, the noise of my country's substation (converter station) is mainly generated by transformers, reactors, filters and fan cooling equipment. Fan noise is mainly medium and high frequency noise, which can be effectively controlled by using traditional noise reduction materials and measures. However, the noise generated by transformers, reactors and filters is dominated by medium an...

AI Technical Summary

Problems solved by technology

[0006] The aluminum fiber sound-absorbing material has high strength, is not affected by the climate, has high heat transfer efficiency, has good sound absorption performance for medium and low frequencies, and is easy to recycle without pollution; it can just meet the above service requirements, and has been widely used in Japanese transportation and construction fields; It is also used in some domestic buildings; but due to its high cost, it cannot be widely used in wider fields. Some domestic manufacturers have begun to produce aluminum fiber sound-absorbing panels with similar performance, but in terms of process control There is still a certain gap: if the temperature distribution inside the heat treatment furnace is not uniform, resulting in uneven structure of the aluminum material, resulting in uneven hardness; another example is hardness control, if the hardness control is not accurate, it is easy to affect the combination of materials of each layer. The combination of materials is the result of plastic deformation, so the hardness has a great influence on the combination

[0007] Aluminum fiber sound-absorbing panels are mainly composed of two layers of expanded aluminum mesh, one layer of aluminum fiber felt, and one layer of thin aluminum layer. The process control of the thin aluminum layer is relatively strict; During the pressing process, the extrusion of the expanded aluminum mesh can naturally crack and meet the requirements of sound wave transmission; the thin aluminum layer is formed by rolling the aluminum ingot multiple times, and multiple heat treatments in the middle to meet the processing requirements. The final product The calendering oil is removed after surface heat treatment, and a certain stress is removed before packaging and selling, but its strength is still too high for the preparation of sound-absorbing panels, and further heat treatment is required. Through heat treatment, the purpose of softening the thin aluminum layer can be achieved. It is known from theory that plasticity After deformation, the recrystallization temperature of aluminum is 260-300°C, and when the heat treatment temperature is above 300°C, there will be no recrystallization nucleation, only grain swallowing and continued growth. If the heat treatment temperature is set in this range, then After heat treatment, the strength and hardness of the material decrease, but the plasticity basically does not change; the grain size above 450°C basically does not change significantly. As the heat treatment temperature rises, the strength and elongation of the aluminum layer change accordingly. The strength and hardness decrease with the increase of the upper limit temperature of heat treatment, and the plasticity first increases and then decreases with the increase of the upper limit temperature of heat treatment. However, there is no conclusion on the reasonable treatment temperature at present.