The history of counter weight

    Counter weight: the history of the 20th century, the development of counter weight fast, one of the important factors is the product technology advances, castings of various mechanical and physical performance is better, still has a good mechanical processing performance at the same time; Another reason is that mechanical industry itself and the development of other industries such as chemical industry, instrument, created favorable material conditions for the counterweight iron industry. Such as the development of detection methods, ensures the improvement of casting quality and stability, and provides the conditions for the development of the theory of counterweight iron. The invention of the electron microscope, etc, to help people into the metal microscopic world, explore the mysteries of metal crystallization, the research of metal solidification theory, guide the counterweight iron production. Developed a large number of superior performance in this period, a variety of new counterweight iron metal materials, such as nodular cast iron, the welding of malleable cast iron, ultra-low carbon stainless steel, aluminum and copper, aluminum, silicon, aluminum and magnesium alloys, titanium, nickel base alloy, etc., and the new process of grey cast iron inoculation treatment, the adaptability of castings is more extensive. After the '50 s, the wet sand modelling, high-pressure chemical hardening sand molding and core making, negative pressure molding, and other special counterweight iron, new technology, such as the shotblast cleaning, the casting possesses high precision of the shape, size and good surface finish, weight iron workshop has been greatly improved the working conditions and environmental health.
    Counterweight iron is a metal melting into meet certain requirements of the liquid is poured into the mold, after cooling solidification, men get a predetermined shape, size and performance of the casting process. Counterweight iron is one of the foundation of modern machinery manufacturing industry technology. Counterweight iron is a kind of human grasp early metal hot working process, about 6000 years of history...