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Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Hardness Testing
The word hardness is used to express various properties of me...

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...



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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