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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Annealing Work
With the exception of several of the higher types of alloy s...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...



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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