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Steel Making

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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



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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