Gud Mould Industry Limited |
Zinc alloy has been playing an important role in hot chamber die
casting because of its good die casting and mechanical properties.
Advantages of zinc alloys are low melting point, slow melting and
heat preservation, less heating of chamber and die-casting wall.
How to reduce defects and produce zinc alloy die castings that meet
requirements are mainly affected by five factors.
Die-casting machine is the key equipment in die-casting production.
Its performance objectively determines quality of die-casting.
Correct selection of die-casting machine is very important to
ensure product quality, improve production efficiency and reduce
production cost. Performance of die-casting machine depends on two
aspects.
Because zinc alloy must fill cavity in a short time, design and
fabrication of die casting mould and its runner system is much more
demanding than that of plastic die. Runner system guides metal
solution to fill cavity in a certain way. It plays an important
role in direction of flow, pressure transfer, filling time, exhaust
condition and temperature distribution of metal solution. It is
also an important factor to determine quality of die castings.
Design principle of runner system of die casting mould should be
aggregated from gooseneck pipe to gate, avoid sharp bending angle,
smooth surface of flow path, so as to reduce resistance and
maintain flow speed of liquid zinc alloy.
It is very important to control surface temperature of zinc alloy
die casting mould to produce high quality zinc alloy die casting.
Improper die temperature will lead to dimension instability of zinc
alloy die castings. During production process, casting deformation
will be ejected, resulting in defects such as hot pressure, viscous
die, surface depression, shrinkage holes and hot bubbles. When mold
temperature difference is large, variables in production cycle,
such as filling, cooling and spraying time, will be affected to
varying degrees. Therefore, zinc alloy die casting mould
temperature machine is an important tool to improve quality of zinc
alloy die casting. Die casting die temperature machine can improve
product quality, production efficiency, reduce damage of high
temperature metal alloy liquid to mould.
Main components and impurities in zinc alloy have a great influence
on quality of die castings, which should be strictly controlled and
mastered. Contents of Al, Cu, Mg and Fe should be appropriate, and
no other impurities which may cause intergranular corrosion should
be avoided. Therefore, reasonable control of alloy composition and
prevention of impurity mixing are also key to zinc alloy die
casting.
Even if there are zinc alloy die-casting machine with excellent
performance, reasonable runner die, die-casting temperature machine
with high precision of temperature control and best zinc alloy
material, it is impossible to produce high-quality products with
high efficiency if the management is not good and operation is
improper. Therefore, operators need to be properly trained and
familiar with performance and operation methods of various
equipment.