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Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...



Heat Treatment Of Punches And Dies Shears Taps Etc






Category: HIGH-SPEED STEEL

HEATING.--The degree to which tools of the above classes should
be heated depends upon the shape, size and use for which they are
intended. Generally, they should not be heated to quite as high a
heat as lathe tools or milling cutters. They should have a high
heat, but not enough to make the flux run on the steel (by pyrometer
1,900 to 2,100 deg.F.).

COOLING.--Depending on the tools, some should be dipped in oil
all over, some only part way, and others allowed to cool down in
the air naturally, or under air blast. In cooling, the toughness
is retained by allowing some parts to cool slowly and quenching
parts that should be hard.

DRAWING THE TEMPER.--As in cooling, some parts of these tools will
require more drawing than others, but, on the whole, they must
be drawn more than water hardening tools for the same purpose or
to about 500 deg.F. all over, so that a good file will just touch
the cutting or working parts.

BARIUM CHLORIDE PROCESS.--This is a process developed for treating
certain classes of tools, such as taps, forming tools, etc. It is
being successfully used in many large plants. Briefly the treatment
is as follows:

In this treatment the tools are first preheated to a red heat,
but small tools may be immersed without preheating. The barium
chloride bath is kept at a temperature of from 2,000 to 2,100 deg.F.,
and tools are held in it long enough to reach the same temperature.
They are then dipped in oil. The barium chloride which adheres
to the tools is brushed off, leaving the tools as dean as before
heating.





Next: A Chromium-cobalt Steel

Previous: Heat Treatment Of Milling Cutters Drills Reamers Etc



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