Lawn Tractor Cast Iron Front Axle
Cast iron front axle support is an
important iron part for lawn tractors and small agricultural
machines. The followings are introduction to their materials,
production process, main defect problems and casting prices.
Ductile Iron Material
The most suitable cast iron materials for cast iron lawn tractor
front axles, should be ductile iron ASTM
A536 Class 60-40-18, 65-45-12, 70-50-05, 80-55-06 in USA, or
DIN 1693 GGG40 and GGG50 in
Germany. In China, their equivalent grades will be ductile iron
QT400-15, QT400-18, QT450-10 and QT500-7.
Gray cast iron is not suitable for producing these parts because of
low tensile strength, barely zero yield strength and elongation.
The suitable production processes of lawn tractor front axle should
be sand casting by molding machines, or manual molding processes.
Although manual molding sand casting process will cause more
sand casting defects,
but it also has advantages. Manual molding process could allow the
tractor front axles cooled in sand molds for longer time, which will
reduce the straightness deformation.
Main Quality Problems and Defects
The common sand castings defects happened on the lawn tractor cast
iron front axles includes sand inclusion, inside shrinkage, air
holes on surfaces, and straightness deformation.
Because most of front axles are very long, so the
cast iron foundries
should inspect the castings one by one for the straightness.
Otherwise, the center of drilling holes at the two ends will have
Whatever by molding machines or manual molding processes, the
molding materials will be green sand, so its casting price will not
be high. Normally, the raw casting price per kg should be in the
range of 1.52 to 1.67 USD/kg.
The surface painting normally are black electrophoretic coating,
which will cause extra painting costs about 0.30 to 0.32 USD/kg.
All these above prices per kg has included the packing costs, but
without shipping costs.
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