. Railway mechanical engineer . an extended rfjd; be faced with alicaring metal that will not only stand a temperature of 618 dcg.!•■., but will also be malleable enough to permit of hammering insegments into dovetail grooves. We have made laboratory testsof a new bull ring metal which showed an extending point of 1,150deg. v., an average scleroscope hardness of 8, and which can beeasily peened into a dovetailed groove J4 in. to % in. deep. Thisis not an experiment, for pistons as large as 50 in. in diameter,faced with bearing metal, are in use in many heavy duty rollingmill engines. Such a pi
. Railway mechanical engineer . an extended rfjd; be faced with alicaring metal that will not only stand a temperature of 618 dcg.!•■., but will also be malleable enough to permit of hammering insegments into dovetail grooves. We have made laboratory testsof a new bull ring metal which showed an extending point of 1,150deg. v., an average scleroscope hardness of 8, and which can beeasily peened into a dovetailed groove J4 in. to % in. deep. Thisis not an experiment, for pistons as large as 50 in. in diameter,faced with bearing metal, are in use in many heavy duty rollingmill engines. Such a piston weighing 3,400 lb. may be foundin operation at the I lomcstead steel works. Time and test will prove whether the bearing metal mentionedwill stand the ravages of superheated steam, but it is safe toassume that if it will not do, another bearing metal can be de-veloped which will be satisfactory. We have known for manyyears that the proper kind of bearing metal will reduce friction, L:- SH I itt hi ^ I i/y-^/KW iHh-i i. Forged and Rolled Steel Piston Faced with Bearing Metal and losses by friction in locomotive cylinders are more than amere trifle. It has been suggested that rolled and forged pistons be facedwith a cast iron ring like piston rings except wider, set in agroove % in. less in depth than the thickness of the ring; thering to be halved, or in three segments, and when assembled inthe piston, to be slightly less in diameter than the cylinder. Thisscheme should work whether the bearing rings are fastened tothe piston or simply held in place by the cylinder walls. It hasa distinct advantage in the ease of replacement of the bearingface, as well as being economical. Many ways can be worked out by which a forged and rolledsteel center can be attached to cast iron bull rings, but if cylinderbushings or cylinders are to be protected against anti-friction face is the logical progression. It is, of course,impossible to roll any kind other than one h
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
