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Steel Making

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

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

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

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...



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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