JPS5772768A - Production of composite roll - Google Patents

Abstract

PURPOSE:To cast composite rolls formed with both insie and outside shell layers perfectly in one body by casting the molten metal for the outside shell layer in a mold then turning the mold cover to discharge the unsolidified part and again casting the molten metal into the cavity discharged of said part. CONSTITUTION:A mold 21 is held with a casting and discharging outlet 29 located in upper position, and when molten metal 31 for forming the outside shell layer of a roll is filled in a body 21, the molten metal 31 contacting with the molding part 21a of the roll body part is quickly cooled to solidify. After it is solidified to the intended thickness, the body 21 is turned over and titled by a turning over device 28, by which the unsolidified molten metal 31 is discharged. Again, the body 21 is returned to an upright state, and the molten metal 43 for the inside shell layer of the roll body part including upper, lower neck parts 22, 23 is charged into the cavity produced by the removal of the unsolidified part. Hence, the outside shell layer 41 of the roll body part by the molten metal 31 for the outside shell of the roll having already solidified and the molten metal 43 for the inside shell of the roll body part including the upper, lower neck parts are melt stuck to one body, whereby the composite roll consisting of the outside shell layer 41, the inside shell layer 26, and the upper neck 24 and lower neck 25 formed extendedly on the top and bottom of the layer 26 is obtained.