Temperature Recording And Regulation

: HEAT TREATMENT OF STEEL
: The Working Of Steel

Each furnace is equipped

with pyrometers, but the reading and recording of all temperatures

are in the hands of one man, who occupies a room with an opening

into the end of the hardening department. The opening is about 15

ft. above the floor level. On each side of it, easily legible from

all of the furnaces, is a board with the numbers of the various

furnaces, as shown in Figs. 59 and 60. Opposite each furnace number< r />
is a series of hooks whereon are hung metal numbers representing the

pyrometer readings of the temperature in that particular furnace.

Within the room, as shown in Fig. 60, the indicating instrument

is to the right, and to the left is a switchboard to connect it

with the thermo-couples in the various furnaces. The boards shown

to the right and the left swing into the room, which enables the

attendant easily to change the numbers to conform to the pyrometer

readings. Readings of the temperatures of the carburizing furnaces

are taken and tabulated every ten minutes. These, numbered 1 to

10, are shown on the board to the right in Fig. 59. The card shown

in Fig. 61 gives such a record. These records are filed away for

possible future reference.






The temperatures of the reheating furnaces, numbered from 1 to

26 and shown on the board to the left in Fig. 59, are taken every

5 min.



Each furnace has a large metal sign on which is marked the temperature

at which the furnace regulator is required to keep his heat. As

soon as any variation from this is posted on the board outside

the pyrometer room, the attendant sees it and adjusts the burners

to compensate.









DIES FOR GLEASON TEMPERING MACHINES.--In Fig. 62 is shown a set

of dies for the Gleason tempering machine. These accurately made

dies fit and hold the gear true during quenching, thus preventing

distortion.