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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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



Tempering Round Dies






Category: HARDENING CARBON STEEL FOR TOOLS

A number of circular dies of carbon tool steel for use in tool
holders of turret lathes were required. No proper tempering oven
was available, so the following method was adopted and proved quite
successful.

After the dies had been hardened dead hard in water, they were
cleaned up bright. A pair of ordinary smiths' tongs was made with
jaws of heavy material and to fit nicely all around the outside of
the die, leaving a 3/32-in. space when the jaws were closed around
the die. The dies being all ready, the tongs were heated red hot, and
the dies were picked up and held by the tongs. This tempered them
from the outside in, left the teeth the temper required and the
outside slightly softer. The dies held up the work successfully
and were better than when tempered in the same bath.





Next: The Effect Of Tempering On Water-quenched Gages

Previous: Shrinking And Enlarging Work



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