In production process of aluminum annealing technology is introduced

by:AAG     2020-11-06

aluminum annealing technology is introduced in the process of aluminum processing annealing are divided into plate strip annealing and foil annealing. Annealing: the purpose of eliminating cold hardening in order to continue rolling or deep processing; Control the product status and performance; Removal of rolling oil and improve the surface quality. According to production capacity and scale, industrial aluminum annealing furnace is divided into single annealing and annealing furnace group composed of annealing production line, the annealing production line by several commonly annealing furnace, composite loading and unloading skip, loading area outside the furnace, cooling chamber ( Some of the stove with bypass cooler) Composition. Furnace with large air volume fan to cyclic heating of industrial aluminum profile, guiding device inside the furnace can effectively ensure uniform air flow through the industrial aluminum, heat evenly, heater USES the monolithic structure, tear open outfit, maintenance is very convenient. Oven door opening and closing adopts pneumatic compression type or mechanical lift, stable operation, good sealing. The furnace platoon lampblack system can effectively remove oil film on the surface of the aluminum industry, adjust the pressure inside the furnace. This kind of furnace charge for 10 ~ 50 t commonly. Industrial aluminum annealing furnace is the most widely used in aluminum processing and heat treatment equipment. With the development of technology and the improvement of product quality requirements, puts forward higher requirements on industrial aluminum annealing, such as annealing the appearance of product quality and consistency of performance indicators. Appearance quality including peeling, bubbles, staining, oxidation corrosion, surface finish, etc. Inner quality including mechanical properties, grain size, anisotropy, etc. In addition to the annealing process and equipment, product annealing processing history, such as ingredients, such as casting process, the cold working rate, the intrinsic quality of annealing products has important influence. In order to improve the quality of annealed products, atmosphere in the furnace, furnace temperature control, furnace type, etc, need to take improvement measures. 1) products, for some special requirements of annealing can use oxygen and moisture content of the minimal protective gas for annealing furnace atmosphere, in order to prevent cracking in the process of volatile oil molecules of rolling, produce tiny carbon hydrocarbons and free, in the product surface staining; Can reduce the thickness of the surface oxide film at the same time, make the product after annealing basic protection of the original metallic luster. When in the use of protective gas, will first furnace heated to a temperature of about 150 ℃, filling the protective gas to wash out after loading, then heat up. Industrial aluminium profile during heating, product surface oil film evaporation, and is discharged from the exhaust mouth, supplementary protective gas at the same time, in order to maintain positive pressure chamber of a stove or furnace. After being oil film all volatile, high temperature heating and heat preservation, recrystallization, make the product in a relatively short time and then cooling. (2) is a relatively new aluminum vacuum annealing processing annealing technology, can prevent oil molecules, oxidation and polymerization of rolling, in vacuum annealing furnace smoke to a certain vacuum degree first, and then heating, in the process of heating to drive away into a small amount of protective gas used in the oil and gas, reducing load of vacuum pump, and accelerate the heat convection. At the beginning of the cooling stage, the need to filling the more than the normal operation of the protective gas to keep furnace negative pressure and positive pressure, by convection fan and cooler will furnace cooled down quickly. Strict seal of the vacuum annealing furnace, vacuum pump capacity is big, the equipment demand is higher, generally used for high purity aluminum foil annealing electrolytic capacitor.
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