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Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Annealing
There is no mystery or secret about the proper annealing of d...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Furnace Data
In order to give definite information concerning furnaces, fu...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...



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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