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Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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

Hardness Testing
The word hardness is used to express various properties of me...

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

Phosphorus is one of the impurities in steel, and it has been...

Compensating Leads
By the use of compensating leads, formed of the same materia...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

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

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

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...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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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