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Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Hardening
The forgings can be hardened by cooling in still air or quen...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...



Heat Treatment Of Gear Blanks






Category: HEAT TREATMENT OF STEEL

This section is based on a paper read before the American Gear
Manufacturers' Association at White Sulphur Springs, W. Va., Apr.
18, 1918.

Great advancement has been made in the heat treating and hardening of
gears. In this advancement the chemical and metallurgical laboratory
have played no small part. During this time, however, the condition
of the blanks as they come to the machine shop to be machined has
not received its share of attention.

There are two distinct types of gears, both types having their
champions, namely, carburized and heat-treated. The difference
between the two in the matter of steel composition is entirely in
the carbon content, the carbon never running higher than 25-point
in the carburizing type, while in the heat-treated gears the carbon
is seldom lower than 35-point. The difference in the final gear
is the hardness. The carburized gear is file hard on the surface,
with a soft, tough and ductile core to withstand shock, while the
heat-treated gear has a surface that can be touched by a file with
a core of the same hardness as the outer surface.





Next: Annealing Work

Previous: Judging The Heat Of Steel



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