Vacuum heat treatment process of aluminum foil

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As a product widely used in industry and civil use, aluminum foil is an important part of ensuring product quality in the process of softening and annealing. In this paper, the structural characteristics and production process of aluminum foil are analyzed. It is pointed out that vacuum annealing in a protective atmosphere has obvious advantages over other heat treatment methods. At the same time, the components, main technical parameters and structural characteristics of the equipment are described. Through equipment testing and practical application by manufacturers for many years, it is proved that the equipment has The reliability has accumulated valuable experience for the development of similar equipment in the future.

Aluminum foil is supplied in coils. After the billet is cold rolled and coiled, it must be softened and annealed to eliminate the stress generated during the rolling process, improve the flexibility and uniformity during stretching, and eliminate deviation during uncoiling. Rate. In the manufacturing process of aluminum foil, full oil lubrication is adopted in the process, and the finished product has strict control on degreasing. The vacuum annealing has the function of degreasing and degassing, which can remove the residual grease, so the product quality can be significantly improved.

Aluminum has a very high chemical affinity with oxygen, and can form a dense AI2O3 protective film at room temperature. Since the oxygen content is only about 0.5% in medium and high vacuum, it can be as low as 0.1% ~ 0.01% after baking, so it can effectively Prevent oxide film or compound formation. At the same time, processing in a vacuum furnace can obtain a bright surface, and the furnace temperature is uniform, the workpiece deformation is small, energy saving and no pollution, etc., especially for the heat treatment of some active metals. Therefore, annealing aluminum foil in vacuum has obvious advantages over other heat treatment methods.

Selection of furnace type according to the characteristics of aluminum foil heat treatment process

Since the aluminum foil is in a rolled state, its heat treatment requires slow heating and slow cooling. The melting point of aluminum is 660.24C, and the thermal expansion coefficient (20 ~ 100°C) is 23.8 times 10-6/K. Controlling the temperature difference between the surface and the core of the aluminum foil to reduce thermal stress becomes the key to heat treatment. Vacuum heating has the characteristics of slow temperature rise, uniform heating and small thermal stress. In a vacuum state, if heat is transferred only by radiation.

Vacuum annealing furnace, mainly suitable for stainless steel deep drawing parts such as plumbing equipment, water expansion parts, pins, medical equipment, stainless steel nails, stainless steel screws, pressure riveting parts, stainless steel bearings, watch cases, watch straps, knives, micro shafts, A multi-purpose furnace for continuous bright annealing, solid solution, demagnetization and stainless steel quenching treatment of stainless steel products such as self-tapping and self-drilling, tableware and other stainless steel products under the control of protective atmosphere.

Horizontal vacuum annealing furnace is mainly suitable for stainless steel tensile parts such as plumbing equipment, water expansion parts, pins, medical equipment, stainless steel nails, stainless steel screws, riveting parts, stainless steel bearings, watch cases, watch straps, knives, micro shafts, It is a multi-purpose furnace for continuous bright annealing, solid solution, demagnetization and stainless steel quenching treatment under the control of protective atmosphere for stainless steel products such as self-tapping and self-drilling, tableware, magnetic materials and other rare metal sheet materials. After treatment, the surface of the product is smooth, non-oxidized and non-decarbonized. It has the advantages of high production efficiency, low energy consumption, less pollution, convenient operation and use, and low labor intensity. It can also be used for brazing and sintering of metal materials.

Equipment selection: The RVA series vacuum annealing furnace produced by SIMUWU is a high-quality product for vacuum heat treatment process. Good temperature control accuracy and temperature control uniformity ensure the effective progress of the vacuum heat treatment process. SIMUWU specializes in the manufacture of vacuum furnaces, has more than ten years of relevant experience, and has a good reputation in the field of vacuum furnace manufacturing. The product line includes vacuum air quenching furnace, vacuum oil quenching furnace, vacuum brazing furnace, etc., which are widely sold in developed and developing countries.