Informational Site NetworkInformational Site Network
Privacy
 
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...



Shrinking And Enlarging Work






Category: HARDENING CARBON STEEL FOR TOOLS

Steel can be shrunk or enlarged by proper heating and cooling.
Pins for forced fits can be enlarged several thousandths of an
inch by rapid heating to a dull red and quenching in water. The
theory is that the metal is expanded in heating and that the sudden
cooling sets the outer portion before the core can contract. In
dipping the piece is not held under water till cold but is dipped,
held a moment and removed. Then dipped again and again until cold.

Rings and drawing dies are also shrunk in a similar way. The rings
are slowly heated to a cherry red, slipped on a rod and rolled
in a shallow pan of water which cools only the outer edge. This
holds the outside while the inner heated portion is forced inward,
reducing the hole. This operation can be repeated a number of times
with considerable success.





Next: Tempering Round Dies

Previous: Preventing Cracks In Hardening



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 2986