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Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

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

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

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Annealing
There is no mystery or secret about the proper annealing of d...

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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



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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