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Steel Making

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

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

Corrosion
This steel like any other steel when distorted by cold worki...

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

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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



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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