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

Steel Making

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

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

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

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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



Lathe And Planer Tools






Category: HIGH-SPEED STEEL

FORGING.--Gently warm the steel to remove any chill, is particularly
desirable in the winter, then heat slowly and carefully to a scaling
heat, that is a lemon heat (1,800 to 2,000 deg.F.), and forge uniformly.
Reheat the tool for further forging directly the steel begins to
stiffen under the hammer. Under no circumstances forge the steel
when the temperature falls below a dark lemon to an orange color
about 1,700 deg.F. Reheat as often as is necessary to finish forging
the tool to shape. Allow the tool to cool after forging by burying
the tool in dry ashes or lime. Do not place on the damp ground
or in a draught of air.

The heating for forging should be done preferably in a pipe or
muffle furnace but if this is not convenient use a good clean fire
with plenty of fuel between the blast pipe and the tool. Never
allow the tool to soak after the desired forging heat has been
reached. Do not heat the tool further back than is necessary to
shape the tool, but give the tool sufficient heat. See that the
back of the tool is flatly dressed to provide proper support under
the nose of the tool.

HARDENING HIGH-SPEED STEEL.--Slowly reheat the cutting edge of
the tool to a cherry red, 1,400 deg.F., then force the blast so as
to raise the temperature quickly to a full white heat, 2,200 to
2,250 deg.F., that is, until the tool starts to sweat at the cutting
face. Cool the point of the tool in a dry air blast or preferably
in oil, further cool in oil keeping the tool moving until the tool
has become black hot.

To remove hardening strains reheat the tool to from 500 to 1,100 deg.F.
Cool in oil or atmosphere. This second heat treatment adds to the
toughness of the tool and therefore to its life.

GRINDING TOOLS.--Grind tools to remove all scale. Use a quick-cutting,
dry, abrasive wheel. If using a wet wheel, be sure to use plenty
of water. Do not under any circumstances force the tool against
the wheel so as to draw the color, as this is likely to set up
checks on the surface of the tool to its detriment.





Next: For Milling Cutters And Formed Tools

Previous: Cutting-off Steel From Bar



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 4147