Report on Power and Machinery Employed in Manufactures, Embracing Steam and Water Power Monographs on Pumps and Pumping Engines, Manufacture of Engines and Steam Vessels

Report on Power and Machinery Employed in Manufactures, Embracing Steam and Water Power Monographs on Pumps and Pumping Engines, Manufacture of Engines and Steam Vessels

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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. 1888 edition. Excerpt: ...sand. The upper part or parts are properly placed upon it surrounded by flasks which are filled with sand to make the impression of these parts. A coating of parting sand prevents the green sand in adjoining flasks from sticking together, so that each flask may be handled separately. They may, therefore, be taken apart, and the pieces of the pattern may be lifted out or removed. Then, being replaced in position, a hollow of t-he form of the casting is left into which the metal is poured through holes formed in the mold, while other and partial vents permit the escape of gas from the molten liquid through the body of the mold. To form holes in the casting, cores are made which are set into the mold separately in core-prints. If these cores formed part of the pattern it could not be lifted out of the mold. The difference in form between the pattern and the casting is that where there is a hole in the latter there is in the former a little boss or projection which forms a print in the mold in which the core rests. The cores are commonly made of sand, flour, and molasses, and are baked hard in ovens. The work of the green-sand molder is to fill and ram down the sand in the flasks so as to make a good mold, with proper vents for the pouring in of the metal and the escape of gas. Upon the removal of the pattern the interior of the mold is carefully smoothed and finished by slicks (smoothing tools of various designs for finishing the surface of the mold), and is made ready for the pouring of the metal. For small pieces the flasks and molds may be prepared most conveniently upon raised benches, and this work is called bench-molding. For large work and great variety of design the building and storing of wood flasks and patterns would involve great...show more

Product details

  • Paperback | 304 pages
  • 189 x 246 x 16mm | 544g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236819209
  • 9781236819208