HC surface treatment network: automotive coating production line coating process, generally can be divided into two parts: one is the surface treatment of metal before painting, also known as pre-treatment technology; the second is the coating construction process. The surface treatment mainly includes removing oil stains, dust, rust on the surface of the workpiece, and removing the old paint layer during the repair work to improve the surface state of the workpiece. This includes machining and chemical treatment of the workpiece surface according to various specific conditions, such as phosphating, oxidation and passivation.

    Automobile painting production line

    The anti-rust coating process of engineering machinery can be generally divided into the surface treatment process before painting and the anti-rust primer coating process.

    Surface treatment is one of the important processes of rust-proof coating. The quality of anti-corrosion coatings for construction machinery depends to a large extent on the way the surface is treated. According to the British Imperial Chemical Company, the coating life is limited by three factors:

    Surface treatment, accounting for 60%; coating construction, accounting for 25%; coating itself quality, accounting for 15%. Construction machinery industry, the surface treatment of different parts.

    Mechanical cleaning can effectively remove rust, welding slag and oxide scale on the workpiece, eliminate welding stress, and increase the bonding force between the rust-proof coating film and the metal substrate.

    Thereby greatly improving the anti-rust quality of engineering machinery parts. The mechanical cleaning standard requires Sa2.5 to be achieved. The surface roughness should be 1/3 of the thickness of the rust preventive coating. Steel shots used for spraying and shot blasting should reach GB6484

    Claim. The surface treatment of sheet metal stampings is generally referred to as chemical surface treatment.

    Automobile painting production line

    The process is: pre-degreasing→degreasing→hot water washing→cold water washing→acid washing→cold water washing→neutralization→cold water washing→surface adjustment→phosphating→cold water washing→hot water washing→pure water washing→drying

    The above process can also be appropriately adjusted according to the oil and rust condition of the sheet metal stamping parts, or the acid washing process or the pre-degreasing process. Degreasing and phosphating are key processes in chemical processing.

    These two processes directly affect the quality of the workpiece chemical treatment and the quality of the rust-proof coating. Relevant process parameters and related auxiliary equipment are also factors that can not be ignored influencing the quality of surface treatment. Due to the wide range of construction machinery, many specifications, heavy machine parts and large parts

    It is generally painted by spraying.

    Automobile painting production line

    Spraying tools include air spray guns, high pressure airless spray guns, air assisted spray guns and portable electrostatic spray guns. Air spray gun spraying efficiency is low (about 30%), high pressure airless spray gun wastes paint,

    The common feature of both is that environmental pollution is more serious.

    So it has been and is being replaced by air-assisted spray guns and portable electrostatic spray guns. For example, Caterpillar Inc., the world’s No. 1 construction machinery company, sprayed with an air-assisted spray gun.

    A portable electrostatic spray gun is used for a thin plate cover such as a hood. Painting equipment for construction machinery generally uses a more advanced water spray paint booth. Small and medium-sized parts can also be used in the water curtain spray booth or the non-pump spray booth, the former has advanced performance.

    The latter is economical, convenient and practical. Due to the heavy weight of the construction machinery and components, the heat capacity is large, so the anti-rust coating is dry.

    Generally, a uniform drying method of hot air convection is used. The heat source can be adapted to local conditions, such as steam, electricity, light diesel oil, natural gas and liquefied petroleum gas.