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Steel Making

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

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

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

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

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

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

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...



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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