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Nickel
Nickel may be considered as the toughest among the non-rare a...

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

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

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

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

Hardness Testing
The word hardness is used to express various properties of me...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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



Separating The Work From The Compound






Category: CASE-HARDENING OR SURFACE-CARBURIZING

During the pulling of the heat, the pots are dumped upon a cast-iron
screen which forms a table or apron for the furnace. Directly beneath
this table is located one of the steel conveyor carts, shown in Fig.
43, which is provided with two wheels at the rear and a dolly clevis
at the front, which allows it to be hauled away from beneath the
furnace apron while filled with red-hot compound. A steel cover is
provided for each box, and the material is allowed to cool without
losing much of the evolved gases which are still being thrown off
by the compound.




As this compound comes from the carburizing pots it contains bits
of fireclay which represent a part of the luting used for sealing,
and there may be small parts of work or bits of fused material
in it as well. After cooling, the compound is very dusty and
disagreeable to handle, and, before it can be used again, must be
sifted, cleaned and blended.

Some time ago the writer was confronted with this proposition for
one of the largest consumers of carburizing compound in the world,
and the problem was handled in the following manner: The cooled
compound was dumped from the cooling cars and sprinkled with a
low-grade oil which served the dual purposes of settling the dust
and adding a certain percentage of valuable hydrocarbon to the
compound. In Fig. 44 is shown the machine that was designed to do
the cleaning and blending.





Next: Blending The Compound

Previous: The Care Of Carburizing Compounds



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