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Steel Making

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

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

The Influence Of Size
The size of the piece influences the physical properties obta...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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



Hardening Carbon Steel For Tools






Category: HARDENING CARBON STEEL FOR TOOLS

For years the toolmaker had full sway in regard to make of steel
wanted for shop tools, he generally made his own designs, hardened,
tempered, ground and usually set up the machine where it was to
be used and tested it.

Most of us remember the toolmaker during the sewing machine period
when interchangeable tools were beginning to find their way; rather
cautiously at first. The bicycle era was the real beginning of
tool making from a manufacturing standpoint, when interchangeable
tools for rapid production were called for and toolmakers were in
great demand. Even then, jigs, and fixtures were of the toolmaker's
own design, who practically built every part of it from start to
finish.

The old way, however, had to be changed. Instead of the toolmaker
starting his work from cutting off the stock in the old hack saw,
a place for cutting off stock was provided. If, for instance, a
forming tool was wanted, the toolmaker was given the master tool
to make while an apprentice roughed out the cutter. The toolmaker,
however, reserved the hardening process for himself. That was one
of the particular operations that the old toolmaker refused to
give up. It seemed preposterous to think for a minute that any
one else could possibly do that particular job without spoiling
the tools, or at least warp it out of shape (most of us did not
grind holes in cutters 15 to 20 years ago); or a hundred or more
things might happen unless the toolmaker did his own hardening
and tempering.

That so many remarkably good tools were made at that time is still
a wonder to many, when we consider that the large shop had from 30
to 40 different men, all using their own secret compounds, heating
to suit eyesight, no matter if the day was bright or dark, and then
tempering to color. But the day of the old toolmaker has changed.
Now a tool is designed by a tool designer, O.K.'d, and then a print
goes to the foreman of the tool department, who specifies the size
and gets the steel from the cutting-off department. After finishing
the machine work it goes to the hardening room, and this is the
problem we shall now take up in detail.





Next: The Modern Hardening Room

Previous: Restoring Overheated Steel



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