. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . English Tiiree-high Rail Mill. .Vinorican Three-high Rail Mill. Fig. 325. — Rolls used in Three-high Rail Mills. (Harbord and Hall. INFLUENCE OF DETAIL OF MANUFACTURE 441 each two of which are driven by a motor. They are arranged intandem, requiring no manipulation from stand to stand. Here, as elsewherethrough the plant, sufficient distance is left between successive sets of rolls toenable a quarter turn of the ingot or bloom to be made, so that it is
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . English Tiiree-high Rail Mill. .Vinorican Three-high Rail Mill. Fig. 325. — Rolls used in Three-high Rail Mills. (Harbord and Hall. INFLUENCE OF DETAIL OF MANUFACTURE 441 each two of which are driven by a motor. They are arranged intandem, requiring no manipulation from stand to stand. Here, as elsewherethrough the plant, sufficient distance is left between successive sets of rolls toenable a quarter turn of the ingot or bloom to be made, so that it is workedequally on all sides. The fiist two mills are equipped with 42-inch rolls,enabling 20-inch by 24-inch ingots to be used. After passing these four millsthe ingot is sent to a 40-inch three-high blooming mill equipped with lifting. Fig. 326. — Three-high Rolls in the Rail Mill at Gary. (Scientific American.) tables and arranged with a combined hydraulic and pneumatic balancing mill, which is driven by a motor, gives the ingot five passes. After being bloomed the ingot is sheared in a 10-inch by 10-inch horizontalblooming shear, and the crop ends or butts are taken outside of the mill by abutt conveyor of unusual construction, which was designed and built by theengineers of the Indiana Steel Company. Each bloom then goes through a28-inch roughing mill, which is three-high and equipped with tilting mill has three stands or rolls. The roughing stand, however, is the onlyone that is three-high, the other two stands being two-high. The mill is driven 442 STEEL RAILS by a motor and gives the bloom three passes. After leaving the rough-ing mill the bloom goes through a two-high 28-inch forming mill driven by , motor, receiving but one pass. Then it is sent to finis
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