In foundry production, when liquid metal by the
holding furnace injection mold, there is still such a problem,
which at this stage any turbulence produces thin scale. These
defects not only not "cure", but also as a weak spot in the cast
iron pieces, and often due to leakage caused by the gap between
wall and make the pressure test failure.
Foam filter can be used as sometimes Gao Bai ORR (Kalpu r A l)
device used for A variety of sand mold casting. In casting, they
not only can reduce the iron content of nonmetallic inclusions
in, still can save significantly with sand. Before using
filters, for example, sprue usually stick on 2 m long cast
aluminum pieces of the ends of the rail. Now just simply put
them through the located at the top of the filter. This
significantly reduces the width of the long sand mold, thereby
reducing the requirement of resin bonded sand. In addition,
improve the quality of the castings, but also decrease the
casting cleaning.
Turbulent flow in gating system tend to occur in the front of
the sprue and runner bar etc. If within the sprue bar placed
across a foam filter, then the first metal flow is blocked, to
fill the sprue, is the smooth casting, so as to prevent the
formation of scale. Foam filter is only with the performance of
the filter.
Do not use filter when pouring casting sprue is not completely
filled with, a mixture of air and liquid metal is suitable sprue.
Result form oxidation film, and entrainment of air into the
cavity, so as to reduce the mechanical properties of castings
and may lack the pressure tightness.
Foam filters for casting industry not only provides the ability
to remove the impurity content in the metal flow, and can
control pouring quantity of pouring smoothly. This ability when
pouring directly, not only can improve the quality standard of
casting, and the more important is that it changed the way the
casting production.
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