Analyze the whole process of valve production. The most important part of the casting process is the smelting of qualified molten steel, which is injected into a qualified casting mold. The qualified casting mold mainly ensures the shape and dimensional accuracy of the casting. The intrinsic quality of the qualified molten steel is to ensure the valve's service performance, ensure the service life, and use the reliability. Therefore, the smelting quality of molten steel is a key link in the casting production process.
Valve casting is a cross-metallurgy and machinery industry involving a wide range of professional industries. There are many influencing factors and the control of the production process is very difficult. Stable production quality, in addition to strict control of feed, to achieve automation of the production process, to eliminate human factors to the maximum extent possible to interfere with the use of equipment systems to ensure the quality and stability of the process, it is China's current improvement in valve production quality, improve production efficiency and reduce Cost effective measures.
How to control the internal quality of the valve casting relates to the survival of a company. Casting is an old and emerging industry. Valve casting is an important basic part of the machinery industry, which determines the service life and reliability of machinery and equipment. Through decades of accumulation of production practices, scientific research, and deep understanding from macroscopical understanding to microscopic theory, with tremendous development, and continuous disclosure of the control of technical parameters during the production process of castings, it is possible to guarantee the performance of the castings and thus guarantee The service life of the valve and the reliability of use. To produce high-quality castings, first of all, it is necessary to study the factors that affect the performance of steel, that is, how to improve the purity of molten steel: how to obtain a good shape of graphite; control of chemical composition fluctuation range, etc., and study the technical control to solve the above problems. Parameters; and study what smelting method is used to achieve the goal.
Steel smelting quality control
(1) Control of the purity of molten steel:
1. Oxide inclusions resulting from the oxidation of elements;
2. Molten oxygen-derived smeltable pores;
3. Sulfur content control to prevent the formation of sulfur eutectic;
4. The control of phosphorus content prevents the formation of phosphorus eutectic;
5. Limit the content of trace elements below the amount of interference.
(2) Molten steel process control:
1. Control of molten steel oxidation;
2. Eliminate the heredity of graphite and obtain good graphite morphology;
3. Control chemical composition fluctuations to obtain accurate chemical composition;
4. Molten steel temperature control;
5. The choice of the best smelting method and the corresponding equipment system.
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