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Steel Making

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...



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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