During the process of cast iron smelting (for medium frequency induction furnaces), due to various factors, shrinkage cavities, slag holes, pores and crack defects (collectively referred to as three holes and one crack) are prone to occur. Their genesis is mainly related to the chemical composition of the alloy, the smelting process and quality, the mold conditions, and the process plan. When the chemical composition and mold conditions of the alloy are constant, the smelting process and the quality of the smelting become the primary research topics.
After several years of actual operation, it was found that shrinkage cavities, pores and cracks are closely related to the composition of cast iron. As long as the melting temperature reaches 1500 ° C or more, and the composition of the alloy liquid is constant, the casting process is unchanged, and shrinkage and pores are generally less likely to occur. At present, most of the shrinkage pores and pores are defects caused by the failure of the chemical composition of the cast iron.
Therefore, in order to eliminate the adverse effects caused by the unqualified chemical composition of pig iron, the following principles should be followed in the iron liquid batching: the upper limit of the carbon content, the lower limit of the silicon content, and the lower limit of the manganese content.
For example, for the clutch platen, material grade HT250, thickness ≥ 30mm, the batching scheme is as follows: w C = 3.35%, w Si = 1.75%, w Mn = 0.6%. The smelting loss rate of carbon was set at 5%, and the smelting loss rate of manganese was set at 10%.
After several years of production practice, the mechanical properties of the castings produced by our company have been stable to meet the technical requirements, and the phenomenon of “three holes and one crack†rarely occurs, and the casting quality is also very stable.
Many types of Grinding Wheels can be used for knife grinding and sharpening, such as aluminum grinding wheels, pink grinding wheels, Silicon Carbide Grinding Wheels,SG grinding wheels, electroplated grinding wheels, ceramic Diamond Grinding Wheels, resin bond diamond grinding wheels and CBN Grinding Wheels.
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Henan Jinlun Superhard Material Co., Ltd , https://www.jinlungrindingtools.com