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A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

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

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

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

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...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

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

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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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