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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Hardness Testing
The word hardness is used to express various properties of me...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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



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



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