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

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

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

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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

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

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

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

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

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

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Impact Tests
Impact tests are of considerable importance as an indication ...



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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