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

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

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

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Critical Points
One of the most important means of investigating the properti...

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

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

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

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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



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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