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

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

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

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

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

Hardness Testing
The word hardness is used to express various properties of me...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...



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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