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Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

Annealing Work
With the exception of several of the higher types of alloy s...

The Influence Of Size
The size of the piece influences the physical properties obta...

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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



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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