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Steel Making

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

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

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

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

Chromium
Chromium when alloyed with steel, has the characteristic func...



Carburizing Low-carbon Sleeves






Category: HEAT TREATMENT OF STEEL

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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