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

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...



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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