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Steel Making

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

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...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Vanadium has a very marked effect upon alloy steels rich in c...

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

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

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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