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Steel Making

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

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

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

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

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Gears
The material used for all gears on the Liberty engine was sel...

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

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

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



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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