Ductile casting gating system structure is simple. 
Generally is 1520 ° ~ 1600 ℃, because of the high pouring
temperature, liquid steel superheat is big, long are connected
with the liquid, the liquid can be improved. But the water
temperature is too high, will cause coarse grains, hot cracking,
porosity and defects such as adhering sand. Therefore, generally
small, thin wall and complex shape ductile castings, the pouring
temperature is about steel melting point temperature of + 150 ℃;
Large, thick squash ink casting pouring temperature about 100 ℃
higher than the melting point.
Ductile casting performance is worse than cast iron.
Because the melting point of stainless steel precision ductile
casting is higher, the mechanical properties of ductile casting
is higher than cast iron. Easy oxidation of liquid steel, steel
illiquid, shrinkage, shrinkage rate is 1014%, the body line
contraction for 1.82.5 %.
To prevent the steel misrun and cold shut, shrinkage cavity
and shrinkage, cracks and defects such as adhering sand,
necessary than cast iron complex process steps:
1, because the stainless steel precision ductile casting
shrinkage greatly over cast iron, ductile castings to prevent
flush shrinkage cavity, shrinkage defects, mostly USES the riser
and the casting process, cold iron and subsidies and other
measures, in order to realize sequential solidification.
2, due to poor liquidity of liquid steel, to prevent the steel
casting cold-lap and misrun, steel wall thickness not less than
8 mm including floor boring machine table, floor boring and
milling machine table is one of the most use of the machine
table.
Landed milling machine workbench, etc can be customized
according to the drawing directly.
1. The floor boring and milling machine table usually have
molding drawings. The same specifications of the flat ground
boring and milling machine with the same general practices.
Practice ground boring and milling machine table provides some
spot, also can be customized according to customer requirements
in accordance with the drawings, or design. Eliminating white
cast iron plate department organization, improving the ground
boring and milling machine table.
2. The floor boring machine table of material: for the hardness
of high strength cast iron HT200-300 working face of HB220-350,
after two manual processing (annealing 600 degrees - 700 degrees
and natural aging 2-3 years) on the ground boring and milling
machine table, ground milling machine table for the purpose of
heat treatment to reduce the stress gradually. Ground profile
milling machine table work of hardness and wear resistance, make
the cast iron platform, cast iron plate precision stability,
wear-resisting performance is good.
3. The ground boring and milling machine table specifications
for: 1120 * 38004000 * 9000 heterosexual specifications can be
customized according to the drawing.
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