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Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...



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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