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Steel Making

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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



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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