By the side of a wood, in a country a long way off, ran a fine stream of water; and upon the stream there stood a mill. The miller's house was close by, and the miller, you must know, had a very beautiful daughter. She was, moreover, very shrew... Read more of Rumpelstiltskin at Children Stories.caInformational Site Network Informational
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Steel Making

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

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

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

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

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

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

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



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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