Ductile iron exhaust manifold, method for preparing the same and device used in preparation
A technology of ductile iron and exhaust manifolds, which is applied in the direction of exhaust devices, noise reduction devices, mechanical equipment, etc., to overcome shrinkage, overcome unsatisfactory product quality, and improve quality
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[0030] The embodiment of ductile iron exhaust manifold preparation method of the present invention:
[0031] 1. Preparation of nodular cast iron material. Add 4500kg of return material and 300kg of pig iron into the cupola, and melt it into molten iron through bottom coke combustion, heat exchange and metallurgical reaction process. Bottom coke combustion means that the bottom coke in the cupola is heated under the action of wind pressure and airflow and starts to burn. When the air passes through the coke, oxygen and carbon undergo a combustion reaction to produce carbon dioxide and carbon monoxide. As the combustion reaction proceeds, the oxygen in the furnace gas gradually disappears, the concentration of carbon dioxide increases, and the furnace temperature also rises. Heat exchange means that the gas in the cupola is mainly convective heat transfer, and the heat exchange between the furnace material and the gas in the cupola is carried out. The iron material in the cupola s...
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