Enamel is the vitreous enamel coated on the surface of the metal substrate, after high temperature sintering, enamel and metal physical and chemical reaction between the strong combination of the overall mechanical strength of the metal surface corrosion of glass, heat, Wear-resistant, easy to clean and decorative features such as a coating material. It is mainly used for steel, cast iron, aluminum products and other surfaces, widely used. First, the basic components of enamel Porcelain enamel is a certain composition of the frit glass frit with additives added to make a mixture of glaze, and then coated on the metal surface coating formed. Second, the enamel substrate surface cleaning Metal preform must be washed before the base, pickling or sand blasting to rust, degreasing and clean. Pump casting is generally shot peening → blasting → low temperature drying. Third, the enamel coating and enamel firing 1. enamel coating methods are mainly hand-painted enamel, spray enamel, dip enamel, electrophoresis enamel, electrostatic spray enamel and other. Generally according to the number of products, quality requirements, raw materials, productivity, etc. to choose a reasonable coating method. 2. Enamel firing according to different products choose the right temperature and time. Enamel firing pump casting process is generally: <300 ℃ into the furnace → heating 550 ~ 820 ℃ → off furnace cold → <300 ℃ baked. Fourth, the performance requirements of castings Castings with enamel should have good mobility, organizational structure must be dense, fine graphite, no pores, cracks and other defects. The mechanical properties and chemical composition should meet the following requirements: Enamel on the pump performance Enamel coating with its outstanding glass properties and good physical and mechanical properties, making it more widely used in the pump industry. 1. The application of enamel technology Cast iron pump produces good corrosion resistance to chemical medium, resistant to a variety of inorganic acids and organic acids, weak acids and organic solvents, as well as oil, non-toxic, non-polluting, non-hanging materials and electrical insulation, etc. , Significantly expanded the application area of ​​cast iron pump. 2. The application of enamel technology to make the pump flow components smoother, thereby reducing the flow of friction loss and improve pump efficiency, proven to increase efficiency of about 5%, significant energy saving.
Round nut is a kind of large fastener, which is widely used in hydraulic oil cylinder and railway internal combustion engine equipment, so the relevant performance is also important. If the round nut is of good quality, it can save the cost of locomotive maintenance and reduce the labor intensity of maintenance workers.
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