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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

Quenching
It is considered good practice to quench alloy steels from th...

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

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Heating
Although it is possible to work steels cold, to an extent de...

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Conclusions
Martien was probably never a serious contender for the honor ...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...



Shrinking And Enlarging Work






Category: HARDENING CARBON STEEL FOR TOOLS

Steel can be shrunk or enlarged by proper heating and cooling.
Pins for forced fits can be enlarged several thousandths of an
inch by rapid heating to a dull red and quenching in water. The
theory is that the metal is expanded in heating and that the sudden
cooling sets the outer portion before the core can contract. In
dipping the piece is not held under water till cold but is dipped,
held a moment and removed. Then dipped again and again until cold.

Rings and drawing dies are also shrunk in a similar way. The rings
are slowly heated to a cherry red, slipped on a rod and rolled
in a shallow pan of water which cools only the outer edge. This
holds the outside while the inner heated portion is forced inward,
reducing the hole. This operation can be repeated a number of times
with considerable success.





Next: Tempering Round Dies

Previous: Preventing Cracks In Hardening



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