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Steel Making

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

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

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

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

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



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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