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Alloying Elements
Commercial steels of even the simplest types are therefore p...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Hardening
The forgings can be hardened by cooling in still air or quen...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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



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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