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Critical Points
One of the most important means of investigating the properti...

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

Furnace Data
In order to give definite information concerning furnaces, fu...

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

The Influence Of Size
The size of the piece influences the physical properties obta...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Hardening
The forgings can be hardened by cooling in still air or quen...

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



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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