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Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

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

The Influence Of Size
The size of the piece influences the physical properties obta...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

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

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

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

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

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

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

Care In Annealing
Not only will benefits in machining be found by careful anne...



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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