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Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

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

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

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

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

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

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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



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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