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Annealing Work
With the exception of several of the higher types of alloy s...

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

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

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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

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

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Heating
Although it is possible to work steels cold, to an extent de...



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



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