. Canadian foundryman (1921). FIG. 1.—Cross section of mold and flask for solid roll. FIG. 4.—Showing cored out roll which must be made by different process. August, 1921 CANADIAN FOUNDRYMAN that the casting will be useless. How-ever, an iron to make a good roll shouldbe low in silicon and low in sulphur andthe combined carbon will automaticallybe high enough. If iron containing sili-con .8, Phos. .6, Manganese, .4, is melted in a fast melting cupolawith plenty of fuel and blast, some ofthe silicon will burn out and some sul-phur will be absorbed but the resultantmetal should make c
. Canadian foundryman (1921). FIG. 1.—Cross section of mold and flask for solid roll. FIG. 4.—Showing cored out roll which must be made by different process. August, 1921 CANADIAN FOUNDRYMAN that the casting will be useless. How-ever, an iron to make a good roll shouldbe low in silicon and low in sulphur andthe combined carbon will automaticallybe high enough. If iron containing sili-con .8, Phos. .6, Manganese, .4, is melted in a fast melting cupolawith plenty of fuel and blast, some ofthe silicon will burn out and some sul-phur will be absorbed but the resultantmetal should make clean sound castingswith good wearing qualities, and wouldbe almost the same without the chill,but the chill sets the grain on the sur-. FIG. 2.—Plan view of flask and pate. face and for some distance inward andalso is lesp apt to make a dirty experience of Mr. Vair in producingchilled rolls will be of interest. Ed. Moulding and Casting Chilled Rolls The production of chilled castings isalways a matter of some uncertainty, anddepends on the initial effect of severalcauses: the quality of the iron, thethickness of the casting, the temperatureof the iron at the time of pouring, andthe conditions of temperature of theiron mould which has a greater effectin striking in when the mould is heat-ed than if quite cold. A very thin strat-um of earthy matter will almost en-tirely obviate the chilling effect. A coldmould does not generally chill so readilyas one which has been heated nearlyto the extent called black hot but thereverse conditions will sometimes oc-cur with some brands of cast iron. Thechilled portion varies in depth accordingto analysis of the iron mixture used. The accompanying drawings illus-trate a
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
