| 摘要 |
PURPOSE:To produce a thin cast strip having excellent surface property and shape characteristic without any defect of crack, etc., by specifying size of recesses and distance between the adjoining recesses arranged at circumferential face of the cooling drum constituting a part of a casting mold. CONSTITUTION:The above cooling drum 1 has opening parts having circle-shape or ellipse-shape of 0.1-1.2mm diameter D and forms the recesses 5 independently having 5-100mum depths on circumferential face constituting a part of the mold. The relation shown with the inequality I between the diameter D (mm) and the distance L (mm) of the dents is to be maintained. In this result, it is prevented that the excess stress to thin part 3b of solidified shell 3 having yet insufficient strength is concentrated, and the growth of the solidified shell is executed. Therefore, the cast strip having excellent surface property without any defect of crack, etc., can be produced. Then, in the figure, 4 shows 'air gas'. |
