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Steel Making

Hardening
Steel is hardened by quenching from above the upper critical....

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

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

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

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

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

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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



Preparing Parts For Local Case-hardening






Category: CASE-HARDENING OR SURFACE-CARBURIZING

At the works of the Dayton Engineering Laboratories Company, Dayton,
Ohio, they have a large quantity of small shafts, Fig. 40, that
are to be case-hardened at A while the ends B and C are to
be left soft. Formerly, the part A was brush-coated with melted
paraffin but, as there were many shafts, this was tedious and great
care was necessary to avoid getting paraffin where it was not wanted.



To insure uniform coating the device shown in Fig. 41 was made.
Melted paraffin is poured in the well A and kept liquid by setting
the device on a hot plate, the paraffin being kept high enough
to touch the bottoms of the rollers. The shaft to be coated is
laid between the rollers with one end against the gage B, when
a turn or two of the crank C will cause it to be evenly coated.





Next: The Penetration Of Carbon

Previous: Preventing Carburizing By Copper-plating



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