Precision ductile casting gating system structure is simple.
General for 1520°~ 1600 ℃, because the pouring temperature is
high, degree of superheat of molten steel, link liquid for a
long time, improve liquidity available. But the water
temperature is too high, can cause grain bulky, cracking,
porosity and defects such as adhering sand. So general small,
thin wall and complex shape of nodular casting, the pouring
temperature is about steel melting temperature + 150 ℃; Large,
thick squash ink casting pouring temperature higher than the
melting point of 100 ℃ or so.
Ductile casting performance is better than cast iron difference.
Because stainless steel precision ductile casting’s high melting
point, precision ductile casting mechanical properties is higher
than cast iron. Liquid steel, steel easy oxidation of liquidity
is poor, shrinkage, its body shrinkage rate is 1014%, line
contraction for 1.82.5 %. To prevent steel happen misrun and
cold shut, porosity and shrinkage, crack and adhering sand
defects such as, it is necessary to take more than cast iron
complex process measures:
1, Because the stainless steel precision castings, ductile cast
iron, shrinkage greatly across to prevent nodular casting on the
porosity, and shrinkage, the casting process mostly adopts the
riser and chill and subsidies and other measures, so as to
realize the solidification order.
2, Because the liquid steel poor liquidity, to prevent steel
happen cold shut and water shortage, steel casting wall
thickness not less than 8 mm including landing boring machine
table, floor type boring and milling machine tool table is the
most used one of the machine table.
Be born milling machine table, etc can be directly according to
the drawings to have something made to order,
1. Landing boring and milling machine table usually have molding
drawings. The same specifications of landing boring and milling
machine have the same general practice plate. Practice landing
boring and milling machine table we have part of the spot, also
can according to the customer request according to the drawings
to have something made to order, or to make their own custom
design. Eliminate iron plate department white organization,
improve landing boring and milling machine table,
2. Landing boring table material: for high strength cast iron
HT200-300 working face of hardness is HB220-350 after two
artificial processing (artificial annealing 600 degrees - 700
degrees and natural aging 2-3 years) on the landing boring and
milling machine table, landing milling machine table for the
purpose of heat treatment to reduce the stress gradually. Be
born milling machine table work situation of the hardness and
wear resistance, so that the cast iron platform, cast iron plate
accuracy stability, wear-resisting performance is good.
3. Landing boring and milling machine table specifications for:
1120 * 38004000 * 9000 heterosexual specification can be
customized according to the drawings.
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