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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

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

Corrosion
This steel like any other steel when distorted by cold worki...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

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



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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