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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

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

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

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

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



Heat Treatment Of Lathe Planer And Similar Tools






Category: HIGH-SPEED STEEL

FIRE.--For these tools a good fire is one made of hard foundry
coke, broken in small pieces, in an ordinary blacksmith forge with
a few bricks laid over the top to form a hollow fire. The bricks
should be thoroughly heated before tools are heated. Hard coal
may be used very successfully in place of hard coke and will give
a higher heat. It is very easy to give Blue Chip the proper heat
if care is used in making up the fire.

FORGING.--Heat slowly and uniformly to a good forging heat. Do
not hammer the steel after it cools below a bright red. Avoid as
much as possible heating the body of the tool, so as to retain
the natural toughness in the neck of the tool.

HARDENING.--Heat the point of the tool to an extreme white heat
(about 2,200 deg.F.) until the flux runs. This heat should be the highest
possible short of melting the point. Care should be taken to confine
the heat as near to the point as possible so as to leave the annealing
and consequent toughness in the neck of the tool and where the tool
is held in the tool post.

COOL in an air blast, the open air or in oil, depending upon the
tools or the work they are to do.

For roughing tools temper need not be drawn except for work where
the edge tends to crumble on account of being too hard.

For finishing tools draw the temper to suit the purpose for which
they are to be used.

GRIND thoroughly on dry wheel (or wet wheel if care is used to prevent
checking).





Next: Heat Treatment Of Milling Cutters Drills Reamers Etc

Previous: Lathe And Planer Tools



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