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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

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

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

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Gears
The material used for all gears on the Liberty engine was sel...

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



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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