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Steel Making

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

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

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

Quenching
It is considered good practice to quench alloy steels from th...

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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...



Flange Shields For Furnaces






Category: FURNACES

Such portable flame shields as the
one illustrated in Fig. 106 may prove serviceable before furnaces
required for plate work, where the doors are often only opened
for a moment at a time. This shield can be placed far enough in
front of the furnace, that it will be possible to work under it
or around it, in removing bulky work from the furnace, and yet
it will afford the furnace tender some relief from the excessive
glare that will come out the wide-opened door. To have this shield
of light weight so that it may be readily pushed aside when not
wanted, the frame may be made up of pipe and fittings, and a piece
of thin sheet steel fastened in the panel by rings about the frame.

About the most disagreeable task in a heat-treating shop is the
removal of the pots from the case-hardening furnaces; these must
be handled at a bright red heat in order that their contents may be
dumped into the quenching tank with a minimum-time contact with the
air, and before they have cooled sufficiently to require reheating.
Facing the heat before the large open doors of the majority of
these furnaces, in a man-killing task even when the weather is
moderately cool. The boxes soon become more or less distorted,
and then even the best of lifting devices will not remove a hot
pot without several minutes labor in front of the doors.

In Fig. 107 is shown a method of arranging a shield on one type of
charging and removing truck. This shield cannot afford more than
a partial protection to the body of the furnace tender, because
he must be able to see around it, and in some cases even push it
partly through the door of the furnace, but even small as it is it
may still afford some welcome protection. The great advantage in
this case of having the shield on the truck instead of stationary
in front of the furnace, is that it still affords protection as
long as the hot pot is being handled through the shop on its way
to the quenching tank.

It might be interesting to many engaged in the heat-treating or
case hardening of steel parts, to make a special note of the design
of the truck that is illustrated in connection with the shield;
the general form is shown although the actual details for the
construction of such a truck are lacking; these being simple, may be
readily worked out by anyone wishing to build one. This is considered
to be one of the quickest and easiest operated devices for the
removal of this class of work from the furnace. To be sure it may
only be used where the floor of the furnace has been built level
with the floor of the room, but many of the modern furnaces of
this class are so designed.

The pack-hardening pots are cast with legs, from two to three inches
high, to permit the circulation of the hot gases, and so heat more
quickly. Between these legs and under the body of the pot, the two
forward prongs of the truck are pushed, tilting the outer handle
to make these prongs as low as possible. The handle is then lowered
and, as it has a good leverage, the pot is easily raised from the
floor, and the truck and its load rolled out.





Next: Heating Of Manganese Steel

Previous: Heavy Forging Practice



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