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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Corrosion
This steel like any other steel when distorted by cold worki...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

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

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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



Hardening High-speed Steels






Category: HIGH-SPEED STEEL

We will now take up the matter of hardening high-speed steels. The
most ordinary tools used are for lathes and planers. The forging
should be done at carbon-steel heat. Rough-grind while still hot
and preheat to about carbon-steel hardening heat, then heat quickly
in high-speed furnace to white heat, and quench in oil. If a very
hard substance is to be cut, the point of tool may be quenched in
kerosene or water and when nearly black, finish cooling in oil.
Tempering must be done to suit the material to be cut. For cutting
cast iron, brass castings, or hard steel, tempering should be done
merely to take strains out of steel.

On ordinary machinery steel or nickel steel the temper can be drawn
to a dark blue or up to 900 deg.F. If the tool is of a special form
or character, the risk of melting or scaling the point cannot be
taken. In these cases the tool should be packed, but if there is
no packing equipment, a tool can be heated to as high heat as is
safe without risk to cutting edges, and cyanide or prussiate of
potash can be sprinkled over the face and then quenched in oil.

Some very adverse criticism may be heard on this point, but experience
has proved that such tools will stand up very nicely and be perfectly
free from scales or pipes. Where packing cannot be done, milling
cutters, and tools to be hardened all over, can be placed in muffled
furnace, brought to 2,220 deg. and quenched in oil. All such tools,
however, must be preheated slowly to 1,400 to 1,500 deg. then placed in
a high-speed furnace and brought up quickly. Do not soak high-speed
steel at high heats. Quench in oil.

We must bear in mind that the heating furnace is likely to expand
tools, therefore provision must be made to leave extra stock to
take care of such expansion. Tools with shanks such as counter
bores, taps, reamers, drills, etc., should be heated no further
than they are wanted hard, and quench in oil. If a forge is not
at hand and heating must be done, use a muffle furnace and cover
small shanks with a paste from fire clay or ground asbestos. Hollow
mills, spring threading dies, and large cutting tools with small
shanks should have the holes thoroughly packed or covered with
asbestos cement as far as they are wanted soft.





Next: Cutting-off Steel From Bar

Previous: Quality And Structure



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