. Railway mechanical engineer . he bar mill (Fig. 1) where it passes through a seriesof rolls which changes the square bloom into a round barof smaller size and greater length. Different sizes of roundbars are thus rolled according to the size of tubes requiredto be made from them. Some of the bars are 8 in. indiameter when finished, while others are as small as 3 still at rolling heat, the round bars are cut to differentweights (according to the length and wall thickness of thefinished tube) bv a circular saw, and centered while still hot(Fij ^) They are then allowed to become cold,
. Railway mechanical engineer . he bar mill (Fig. 1) where it passes through a seriesof rolls which changes the square bloom into a round barof smaller size and greater length. Different sizes of roundbars are thus rolled according to the size of tubes requiredto be made from them. Some of the bars are 8 in. indiameter when finished, while others are as small as 3 still at rolling heat, the round bars are cut to differentweights (according to the length and wall thickness of thefinished tube) bv a circular saw, and centered while still hot(Fij ^) They are then allowed to become cold, afterwardsbeinginspected, marked with a die to identify the steel, andsent to the piercing mill. , „ j The l)urs are now known as billets, or rounds, and Pig Billet Entering Bar Mill est to railway shop men. Satisfactor)- tubes cannot be madewithout uniform steel of good quality. This steel is de-livered to the heating furnace in blooms of several sizes andweights 6 to 10 in. square by 11 ft. long and weighing 1,^00.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
