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Steel Making

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

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

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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Hardness Testing
The word hardness is used to express various properties of me...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

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

The crankshaft was the most highly stressed part of the entir...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Carburizing Low-carbon Sleeves


Low-carbon sleeves are carburized
and pushed on malleable-iron differential-case hubs. Formerly,
these sleeves were given two treatments after carburization in
order to refine the case and the core, and then sent to the grinding
department, where they were ground to a push fit for the hubs. After
this they were pushed on the hubs. By the method now employed,
the first treatment refines the core, and on the second treatment,
the sleeves are pushed on the hub and at the same time hardened.
This method cuts out the internal grinding time, pressing on hubs,
and haulage from one department to another. Also, less work is
lost through splitting of the sleeves.

The machine for pushing the sleeves on is shown in Fig. 64. At
A is the stem on which the hot sleeve B is to be pushed. The
carburized sleeves are heated in an automatic furnace, which takes
them cold at the back and feeds them through to the front, by which
time they are at the correct temperature. The loose mandrel C
is provided with a spigot on the lower end, which fits the hole
in the differential-case hub. The upper end is tapered as shown
and acts as a pilot for the ram D. The action of pushing on and
quenching is similar to the action of the Gleason tempering machine,
with the exception that water instead of oil is used as a quenching
medium. The speed of operation depends on a number of variables,
but from 350 to 500 can be heated and pressed on in 11 hr.

Next: Cyanide Bath For Tool Steels

Previous: Hardening Operation

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