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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

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

Hardening
The forgings can be hardened by cooling in still air or quen...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...



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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