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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...



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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