Transactions of the American Society of Mechanical Engineers Volume 16

Transactions of the American Society of Mechanical Engineers Volume 16

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...of Mr. West's brief reference to it, that one of the by no means insignificant things which does affect the shrinkage of a casting is the temperature at which the iron is poured. What I contend for is that the temperature at which the iron is put into the mould will determine, to an extent necessary to be taken into account, the amount of shrinkage. We all have seen solid cast iron float when put upon the surface of molten cast iron, and we conclude that its maximum density is, while in liquid form, somewhere near the point of solidification. We also know that the shrinkage of steel castings is something over double that of cast irons, and I presume, in some degree, at least, from the fact that steel castings are poured at a very much higher temperature. Now it occurs to me, that, as a guide for determining the amount of shrinkage of castings, and important factor is left out if we disregard the effect of the temperature at which it is poured. While I may not be able to explain just why castings in many cases have less shrinkage as they are poured cooler, I do know that to be a fact, from observation; but I do not know that this is invariably the case, or that the reverse may not obtain under some conditions. It seems, however, not improbably connected with the explanation given, to the effect that the crystalline structure of the cooled, solidified iron is different under different rates of cooling. We may readily see that a casting of considerable volume, if poured very hot, may have a longer time elapse between the periods when its peripheral parts and the more central bulk assume the solid form, than if poured cooler. As the solidification of the outer or more superficial parts to some small depth will not, probably, more

Product details

  • Paperback | 378 pages
  • 189 x 246 x 20mm | 671g
  • United States
  • English
  • black & white illustrations
  • 1236780302
  • 9781236780300