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Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

Gears
The material used for all gears on the Liberty engine was sel...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

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

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

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

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

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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



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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