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Steel Making

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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



Carburizing Low-carbon Sleeves






Category: HEAT TREATMENT OF STEEL

Low-carbon sleeves are carburized
and pushed on malleable-iron differential-case hubs. Formerly,
these sleeves were given two treatments after carburization in
order to refine the case and the core, and then sent to the grinding
department, where they were ground to a push fit for the hubs. After
this they were pushed on the hubs. By the method now employed,
the first treatment refines the core, and on the second treatment,
the sleeves are pushed on the hub and at the same time hardened.
This method cuts out the internal grinding time, pressing on hubs,
and haulage from one department to another. Also, less work is
lost through splitting of the sleeves.

The machine for pushing the sleeves on is shown in Fig. 64. At
A is the stem on which the hot sleeve B is to be pushed. The
carburized sleeves are heated in an automatic furnace, which takes
them cold at the back and feeds them through to the front, by which
time they are at the correct temperature. The loose mandrel C
is provided with a spigot on the lower end, which fits the hole
in the differential-case hub. The upper end is tapered as shown
and acts as a pilot for the ram D. The action of pushing on and
quenching is similar to the action of the Gleason tempering machine,
with the exception that water instead of oil is used as a quenching
medium. The speed of operation depends on a number of variables,
but from 350 to 500 can be heated and pressed on in 11 hr.





Next: Cyanide Bath For Tool Steels

Previous: Hardening Operation



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