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Steel Making

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

SILICON is a very widespread element (symbol Si), being an es...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Carburizing Low-carbon Sleeves


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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