Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . rizontal passagesunder the bed, whence it enters the opening under the fire-bars, and reaches the fire at a high temperature. The fur-nace has also been advantageously adopted for puddling.(Journal of the Iron and Steel Institute, i., 1872, p. 132.) Rolling-IIiix Machinery.—The squeezers, and the com-mon form of rolling-mill, or two-high train, as it iscalled, have already been described. In the two-high train,one or more pairs of rolls are connected together, and thepiece of metal req
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . rizontal passagesunder the bed, whence it enters the opening under the fire-bars, and reaches the fire at a high temperature. The fur-nace has also been advantageously adopted for puddling.(Journal of the Iron and Steel Institute, i., 1872, p. 132.) Rolling-IIiix Machinery.—The squeezers, and the com-mon form of rolling-mill, or two-high train, as it iscalled, have already been described. In the two-high train,one or more pairs of rolls are connected together, and thepiece of metal requiring to be rolled is passed alternatelybetween and over the pair, the operation being repeated insuccessive grooves until the iron is reduced to the requiredsize. The rolls present three distinct parts : the body, thenecks or journals, and the ends or wabblers. The different sets of rolls are connected togetherby spindles and coupling-boxes. The wabblers and the ends of the spindles are grooved, and thecoupling-boxes fit loosely over them, allowing a play of about one-eighth of an inch. The rolls are. 198 IRON-WORKING MACHINERY. 2467. supported between chucks inclosed in the housings. Each housing is supplied with a large screws, which pass through large nuts fitted to the caps of the housings, press on the chucksabove the upper roll, and serve to hold them in position. In order to facilitate the entering of thebar in the various grooves, wrought-iron pieces called rests are placed in front of the rolls, nearlybut not quite at the height of the bottom of each groove. On the side of the rolls where the ironleaves the grooves are placed other pieces called guides, with grooves in them to direct the iron fromthe rolls. In the smaller sizes of rolls, or finishing-rolls, guides instead of rests are placed in front of the rolls, which arc then calledguide-rolls. One of the most important im-provements in rolling-mill ma-chinery has been the introduc-tion of the three-
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Keywords: ., bookauthorbenjaminpark18491922, bookcentury1800, bookdecade1880
