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Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

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

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

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

The Influence Of Size
The size of the piece influences the physical properties obta...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Annealing Method
Forgings which are too hard to machine are put in pots with ...



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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