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

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

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

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

Heating
Although it is possible to work steels cold, to an extent de...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Chromium
Chromium when alloyed with steel, has the characteristic func...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...



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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