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

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

Hardening
The forgings can be hardened by cooling in still air or quen...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Conclusions
Martien was probably never a serious contender for the honor ...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

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

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

Furnace Data
In order to give definite information concerning furnaces, fu...

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Air-hardening Steels
These steels are recommended for boring, turning and planing...



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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