| 摘要 |
PURPOSE:To prevent the clogging of a powder adding nozzle and to prevent the quality degradation of an ingot by analyzing the sticking distance of the sticking jet generated in the metallic flow in the powder mixing part of a continuous casting device and providing the opening part of said nozzle in the position higher than the sticking position. CONSTITUTION:The molten steel flow 5 flowing down from a tundish nozzle 2 is bent by the vortexes of air generated in a tightly closed mixing part and sticks on the inside wall 8 of the mixing part. In order to prevent the generation of the internal defects of an ingot, it is necessary to prevent the clogging of a nozzle 6 for adding powder by locating the opening part 9 at the leading end of said nozzle 6 in the position higher than the sticking distance Xr of the stucking jet 5. Said Xr can be determined geometrically and empirically by the equation. Here, Xr; the distance of the sticking jet mm., Ws; the outflow diameter of the down flow metal mm., alpha; the angle of inclination of the wall 8 deg., R; the radius of curvature of the sticking jet mm., theta; the angle of collision of the sticking jet deg., Y; the distance between the point where the centerline of the sticking jet and the wall 8 intersect and the sticking jet line mm.. |
