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Steel Making

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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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