Nodular casting forging is the use of forging machinery, metal
pressure, so as to produce plastic deformation to obtain certain
mechanical properties, a certain shape and size forging
processing method. Through the forging can eliminate metal cast
loose, welded hole, forging machinery forging by forming method
can be divided into:
(1) Open forging (free forging). Use impact or pressure makes
the metal in the upper and lower two to iron (anvil block) to
obtain the needed between deformation of forgings, basically
have blacksmithing and mechanical forging two.
(2) The closed mode forging. Metal stock in a certain shape of
the die interior compression deformation for forging, can be
divided into die forging, cold heading, rotary forging,
extrusion, etc. According to the deformation temperature forging
and can be divided into hot forging (processing temperature
higher than the blank metal recrystallization temperature),
temperature forging (below the recrystallization temperature)
and cold forging (room temperature). Forging materials mainly is
the various components of the carbon steel and alloy steel,
followed by aluminum, magnesium, titanium, copper and its alloy.
Material of the original state has a bar, ingot casting, metal
powder and liquid metal, etc. Metal in the deformation of the
cross-sectional area before than after deformation die off area
called forging ratio. Choose the right forging than to improve
product quality and reduce cost have very big concern.
Ductile iron casting is metal melting into accord with certain
requirements of the liquid and poured into a mold, the cooling
solidification, cleaning after treatment for have a reservation
shape, size and properties of casting (parts or blank) process.
The modern machinery manufacturing industry base process:
Casting blank production cost, for complicated shape, especially
with complicated inner chamber parts, more can show its economy;
At the same time it's a wide adaptability, and has good
comprehensive mechanical properties. But casting production of
required materials (such as metal, wood, fuel, molding material,
etc.) and equipment (such as metallurgical furnace, sand
machine, molding machine, core making machine, shakeout machine,
shot blasting machine, cast iron plate, etc.) is more, and can
produce dust, harmful gas and noise and pollution of the
environment. Casting is human master earlier a metal hot working
process, and has about 6000 years of history. In 3200 BC,
Mesopotamia appeared copper frog casting.
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