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Steel Making

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

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

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

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

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...



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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