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

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

Martien was probably never a serious contender for the honor ...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

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

Carburizing Low-carbon Sleeves


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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