JPS55144371A - Production of dissimilar material composite casting - Google Patents

Abstract

PURPOSE:To obtain the cylinder or circular column whose outside and inside shells are of dissimilar materials and whose outside shell is of the axially partially dissimilar materials integral with the inside shell by centrifugally casting plural outside shell molten metals of different inoculation amounts into the respective portions of the mold segmented in its axial direction and casting the inside shell molten metal into the outside shell thus obtained. CONSTITUTION:For example, it is assumed that the steel bar rolling roll integrally formed with outside shell portions 3, 4 of varied inoculation amounts meeting respective requirements and inside shell 1 is going to be manufactured. To this end, a partition member 7 is erected to a suitable height on the inside surface of a centrifugal casting mold 5 which is supported and rotated by revolving rolls 6 to segment between sand molds 8. Two kinds of the outside shell molten metals comprising beforehand adding inoculants of different amounts to the molten metal of the same chemical composition in ladles 11, 12 or the like are poured into the respective segment portions through the pouring members such as the spouts 9, 10 or the like inserted into this mold 5 from its one or both opening ends and are centrifugally cast. The inside shell molten metal is poured into the resultant outside shell by a centrifugal or a place-pouring casting method, whereby the composite roll integrally fusion-bonded with the outside and inside shells is obtained.