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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Gears
The material used for all gears on the Liberty engine was sel...

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...



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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