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Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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 ...

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

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Hardening
Steel is hardened by quenching from above the upper critical....

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

Quenching
It is considered good practice to quench alloy steels from th...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...



The Packing Department






Category: HEAT TREATMENT OF STEEL

In Fig. 56 is shown the packing pots where
the work is packed. These are of malleable cast iron, with an internal
vertical flange around the hole A. This fits in a bell on the
end of the cast-iron pipe B, which is luted in position with
fireclay before the packing begins. At C is shown a pot ready
for packing. The crown gears average 10 to 12 in. in diameter and
weigh about 11 lb. each. When placed in the pots, they surround
the central tube, which allows the heat to circulate. Each pot
contains five gears. Two complete scrap gears are in each furnace
(i.e., gears which fail to pass machining inspection), and at
the top of front pot are two or more short segments of scrap gear,
used as test pieces to gage depth of case.



After filling to the top with compound, the lid D is luted on.
Ten pots are then placed in a furnace. It will be noted that the
pots to the right are numbered 1, 2, 3, 4, indicating the position
they are to occupy in the furnace.

The cast-iron ball shown at E is small enough to drop through
the pipe B, but will not pass through the hole A in the bottom
of the pot. It is used as a valve to plug the bottom of the pot
to prevent the carburizing compound from dropping through when
removing the carburized gears to the quenching bath.

Without detracting from the high quality of the work, the metallurgist
in this plant has succeeded in cutting out one entire operation
and reducing the time in the hardening room by about 24 hr.

Formerly, the work was carburized at about 1,700 deg.F. for 9 hr. The
pots were then run out into the yard and allowed to cool slowly.
When cool, the work was taken out of the pots, reheated and quenched
at 1,600 deg.F. to refine the core. It was again reheated to 1,425 deg.F.
and quenched to refine the case. Finally, it was drawn to the proper
temper.





Next: Short Method Of Treatment

Previous: Heat-treating Department



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