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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...

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

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....

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Quenching
It is considered good practice to quench alloy steels from th...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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

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

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



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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