. Railway mechanical engineer . treating plant and to thefact that some of these tools are made from axle steel andcase-hardened. The use of this material offers a number ofadvantages where occasional jobs come into the shop requir- The Oil Bath Tempering Furnace and Small Oil Burning MuffleFurnace oil and salt water tanks are jacketed and cooled with flow-ing water. These tanks arc conveniently located to the elec-tric furnaces. In hardening carbon steel tools they are firstquenched in water till the viljration ceases and are then trans-ferred to the oil. High speed steel tools are quenched i
. Railway mechanical engineer . treating plant and to thefact that some of these tools are made from axle steel andcase-hardened. The use of this material offers a number ofadvantages where occasional jobs come into the shop requir- The Oil Bath Tempering Furnace and Small Oil Burning MuffleFurnace oil and salt water tanks are jacketed and cooled with flow-ing water. These tanks arc conveniently located to the elec-tric furnaces. In hardening carbon steel tools they are firstquenched in water till the viljration ceases and are then trans-ferred to the oil. High speed steel tools are quenched in oil. Classes of Work HandledWhen a run of high speed steel tools is to be treated bothelectric furnaces are This reduces the time requiredfor the complete heating operation to that required to pre-heat the tools to about 1,800 deg. in the low temperaturefurnace. Work of this kind is handled in lots in order thatas long a run as possible may be obtained without the ne-cessitv of cooling down and reheating the A Number of Special Tools Representative of Work Turned Out ofthe Heat Treating Plant ing s]3ecial tool eciuipment and also for tools which are regu-larly but infrequently used. This material is not used for< utting tools which are expected to operate at high speed. In the illustration showing a number of these siiecial tools,the first one at the right is a hob which was made for usein replacing a broken worm gear from a coaling station onthe line. This cutter was machined out of axle steel, sent tothe blacksmith shop for case-hardening and reheated in thetool room for quenching. By its use the new gear was cut andtlie plant returned to service with only a few days delay atan expense from which the cost of tool material was prac-ticallv eliminated. Such tools manufactured from tool steelare difficult to harden without serious risk of fracture andloss both of the material and time expended in their manu-facture. The case-hardening process is comparativ
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
