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

Chromium
Chromium when alloyed with steel, has the characteristic func...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

Critical Points
One of the most important means of investigating the properti...

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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



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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