Economic Paper Volume 34

Economic Paper Volume 34

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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. 1914 edition. Excerpt: obtained by the addition of loam, clay, or molding sand of strong bond. The permeability is sometimes increased by mixing rye straw in the core sand or by winding the core with rope made of swamp hay. In small cores it is customary to use coarse sand, which insures sufficient permeability, and to add to it a small quantity of clay or molasses water for bond. "The principal requirement of the steel sand is refractoriness, because the temperature of molten steel is considerably in excess of the temperature of the molten iron or brass. In order to obtain sufficient refractoriness, it is necessary to use almost chemically pure silica sand. The grain of the sand varies with the size of the casting and with the smoothness of surface desired. Ordinary glass sand, silica sand, and some furnace sands are adaptable to use in steel molding by the addition of a binder. l "From the foregoing statements it will be seen that it is difficult to formulate a comprehensive definition of molding sand. The variety is great, ranging through many degrees of each of the required properties. Most molding sands are cohesive, some strongly so, but others are wholly lacking in this property, and require the artificial addition of bonding material. Refractoriness varies from so low that a sand burns out with one using to so high that the sand can be used repeatedly. Permeability ranges widely, and molding sands differ from coarse to exceedingly fine. The colors vary from white and yellow to brown and red. "Molding sand in place possesses for the most part relatively little intrinsic value. The cost of excavation and preparation makes the market value, to which should be added freight rates. Although many molders insist on sand from a more

Product details

  • Paperback | 146 pages
  • 189 x 246 x 8mm | 272g
  • United States
  • English
  • black & white illustrations
  • 123689930X
  • 9781236899309