Two weary parents once advertised: "WANTED, AT ONCE--Two fluent and well-learned persons, male or female, to answer the questions of a little girl of three and a boy of four; each to take four hours per day and rest the parents of said chil... Read more of CHILDREN at Free Jokes.caInformational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

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

Heating
Although it is possible to work steels cold, to an extent de...

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

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

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

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...



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



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 2818