| 摘要 |
PURPOSE:To melt thoroughly an inoculant in a molten cast iron and improve efficiently mechanical characteristic owing to the improvement in the structure of a cast iron casting in the stage of adding the inoculant to the molten cast iron by adding acceleratively the inoculant to the molten cast iron. CONSTITUTION:Ferrosilicon and other inoculants are added to a molten cast iron to improve the precipitation of graphite and the shape of graphite owing to decomposition of the cementite in the cast iron and to improve the mechanical strength of a casting in the stage of casting the molten cast iron into a casting mold and producing the casting. The addition of the inoculant M is accomplished by dropping the inoculant M in a hopper 3 into an accelerator 5 by means of a screw conveyor 4, accelerating the inoculant by a fan 5b, etc. and adding the same to the molten cast iron flowing in a charging port 1b in the stage of charging the molten cast iron R in an automatic charging furnace 1 through said charging port into a casting mold 2. Since the inoculant is accelerated, the inoculant intrudes into the molten cast iron R without floating thereon and is thoroughly melted therein so that the inoculant provides efficiently an inoculating effect on the molten cast iron R. |
