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Air-hardening Steels
These steels are recommended for boring, turning and planing...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Hardening
Steel is hardened by quenching from above the upper critical....

Gears
The material used for all gears on the Liberty engine was sel...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Impact Tests
Impact tests are of considerable importance as an indication ...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...



Temperature Recording And Regulation






Category: HEAT TREATMENT 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
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.





Next: Hardening Operation

Previous: Testing And Inspection Of Heat Treatment



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