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Steel Making

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

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

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Care In Annealing
Not only will benefits in machining be found by careful anne...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

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

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...



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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