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Encyclopedia Britannica - Main :: NAN-NEW |
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NEWS ma i7 ui I%/O/// I%///////%//y I'ml /i%/, A rrn dN p m, r II 746 carried on by different men in distinct shops, yet the foregoing principles and methods apply to all alike. Work
loam (which is subsequently dried). Hand and machine moulding are practised in each, the last-named excepted. The differences in working are those due to the various characteristics of the different metals and alloys , which involve differences in the sand mixtures used, in the dimensions of the pouring channels, of the temperature at which the metal or alloy must be poured, of the fluxing and cleansing of the metal, and other details of a practical
brass
brass
A special
ordinary tramway wheels, the rolls of iron and steel rolling
special
ordinary mould of sand. The purpose of chill-casting is to produce a surface hardness in the metal.The shrinkage of metal is a fact which has to be taken account of by the pattern-maker and moulder. A pattern and mould are made larger than the size of the casting required by the exact amount that the metal will shrink in cooling from the molten to the cold state. This amount varies from s in. in 15 in., in thin iron castings, to s in. in 12 in. in heavy ones. It ranges from ag in. to $g in. per foot in steel, brass and aluminium . Its variable amount has to be borne in mind in making light and heavy castings, and castings with or without cores, for massive cores retard shrinkage. It is also a fruitful cause of fracture in badly proportioned castings, particularly of those in steel. Brass is less liable to suffer in this respect than iron, and iron much less than steel. (J. G. H.)End of Article: NEWS If you wish, you can link directly to this article.
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