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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

Impact Tests
Impact tests are of considerable importance as an indication ...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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



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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