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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Annealing
There is no mystery or secret about the proper annealing of d...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Hardening
The forgings can be hardened by cooling in still air or quen...



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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