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Steel Making

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Gears
The material used for all gears on the Liberty engine was sel...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

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

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...



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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