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Steel Making

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

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

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Molybdenum steels have been made commercially for twenty-five...

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

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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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