In recent years, China's rapid economic development, aerospace, decorative materials and beverages and other industries on the increasing demand for aluminum strip, aluminum foil, PS substrate, aluminum plastic tape, canned materials and other high-precision aluminum sheet and strip has brought rapid development. These products require very strict flatness and cleanliness, and high-precision aluminium bars are usually used for oil cooling and lubrication rolling, a large number of rolling oils and aluminium powder on the surface. In order to obtain good surface quality, it is necessary to clean and remove surface residues. In addition to flatness requirements for aluminum strip and high-tension bending straightening, tension-bending straightening strip gradually produces plastic film ZhongBing releasing internal stress under the effect of secondary and bending, and improves the defects of cold working waveform, warpage, transverse bending, and potential bad shape of strip steel. Considering the straightening process, surface must be carried out first. Clean.
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Principle and Theory of Aluminum Strip Cleaning
In the cold rolling process, fine alumina powder adsorbed on the surface of rolls and rolled aluminium sheet will be produced, and the rolling oil and suspension components will remain on the surface of aluminium sheet, which will affect the processing of composite, coating and other finished products. In straightening, the tension applied to a part of the strip is transformed into the pressure of the strip on the tension roll due to the violent bending deformation. Finally, the friction driving rolls form a set. Therefore, if the surface of the strip is not clean, during the alumina powder shedding deformation, x will adhere to the surface tension roll and grease, resulting in surface wear of the drum and slight damage to the aluminium plate. Therefore, it must be cleaned by a special cleaning equipment. Cleaning is a pressure pump pressurized cleaning medium, non-contact spray washing or contact surface brushing zone, so the oil on the surface of aluminium powder dissolves and falls off into the cleaning medium, and then through extrusion roll extrusion and high-pressure air blowing, even if high-temperature air drying, in order to obtain clean and dry aluminium bars. At the same time, through the continuous supplement of cleaning medium and online circulating filtration system, the cleaning medium can be kept clean enough, and the heat energy and cleaning medium can be saved greatly. At present, the commonly used cleaning media in aluminium processing industry are cleaning agent (or solvent oil), softening hot water and chemical solvent, each of which has its advantages and disadvantages.
Next, the high pressure water jet technology is used to describe the cleaning system.
The jet distance of high pressure water jet is produced by direct injection of dense jet beam, which produces huge impact force. The jet beam is symmetrically arranged with the central line of the nozzle, but divergence exists. The jet is generally divided into three sections. The length of the original section is expressed in L. The characteristic of the jet section is that the dynamic pressure along the axis is almost constant, and the dynamic pressure at the jet tip is the same as that at the nozzle exit. Another feature is very dense texture, mass and air mixing, which is the strongest force. It is mainly used to clean hard dirt, basic parts, length and building owner said that the aircraft is characterized by mixing air with water jet, holes and eddies, which is mild, suitable for various cleaning equipment and materials. It should be pointed out that with the increase of distance, the effective hitting force also decreases gradually. The length of divergence section is expressed by L3, which is characterized by complete mixing of air-water jet, complete atomization of jet, and significant decrease of impact pressure and jet velocity. Technically, this part of Jet has no application value. The key to the application of water jet cleaning lies in the selection and matching of pressure and flow rate. However, under different jet distances and diffusion angles, the pressure and flow rate acting directly are different.
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