Canadian foundryman (1917) . o serviceconditions, namely hard tread, softplates and soft hub. Figure No. 1 showsa section of the mould in which thechilled iron wheel is cast, and the sameprinciple of moulding has been in useever, since its introduction. AnnealingWe have found that a 725 lbs. is poured in about twelve molten metal is then subjected todifferent cooling conditions due to thecomplexity of the mould, which is madeup partly of iron, partly of dry sand,and partly of green sand. That part ofthe mould which consists of iron is the These crude methods were later
Canadian foundryman (1917) . o serviceconditions, namely hard tread, softplates and soft hub. Figure No. 1 showsa section of the mould in which thechilled iron wheel is cast, and the sameprinciple of moulding has been in useever, since its introduction. AnnealingWe have found that a 725 lbs. is poured in about twelve molten metal is then subjected todifferent cooling conditions due to thecomplexity of the mould, which is madeup partly of iron, partly of dry sand,and partly of green sand. That part ofthe mould which consists of iron is the These crude methods were later dis-placed with the introduction of cooling-pits lined with fire brick, each pit hold-ing from ten to fifteen wheels. Just assoon as the wheel is solidified, it is re-moved from the mould red hot andplaced in a pit maintained at the propertemperature, and by this process thetread and the plates and the hub re-sume an equilibrium of temperature andthe wheels remain in the pits for sev-eral days until the shrinkage strains are. FIG. 5. COMPOSITE OF 525 LBS. WHEEL FOR CARS OF 10 TONS DESIGN FOR 30 TONS CAPACITY; DESIGN FOR50 TONS CAPACITY CARS. 625 LBS. best conductor of heat, therefore, thetread or running surface is cooled al-most instantaneously, whereas the platesand the hub, having been formed bydry and green sand, cool slowly. Inconsequence, shrinkage strains are en- finally removed by the gradual and uni-form cooling process. The pouring and annealing are im-portant parts of the method by which thewheel is made, but they are only two ofthe multitudinous processes required. (A N A I) I A N VOV NDK Y M A N Tiic intricacies of manufacture are onlyrecognized by those who have actuallyengaged in the business, and complexproblems are continually confronting the manufacturer from the assemblingof the materia! to the finished wheel. We have found the method of manu-facture as to pouring has not been ma-terially changed, ami we have also Foundthat the pattern i
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