How much do you know about die casting?
Die casting is belonged to the special
metal castings; it is a kind of advanced method with long history
which developed based on the common metal casting techniques. The
process is that put the molten or semi-molten state metals into
pressure chambers of die casting machine, under the high pressure,
the metals fill into the cavities of the die casting mould with high
speed, then, the molten or semi-molten state metals will be
concreted to the desired molds. This is a high effective precision
The advantages of die casting
1. The high quality of die castings
The castings sizes are accurate and stable, the interchangeability
is good. It can make metal castings's surface grain thinner, the
density of elongation tissues compact and make the hardness and
intensity of the metals surface stronger and higher. This method
suit to the metal castings which are with complex thin-wall, it
makes the wall of the zinc alloy die castings reach to 0.3mm, make
the wall of the aluminum alloy reach to 0.5mm, besides, it suits to
the complex castings which can not be produced by other methods.
2. The high rate production
The production rate of die casting methods is the higher than
traditional green sand and resin sand casting processes, however,
much lower than automatic molding line. But as for the aluminum
castings, it can reach very high production rate.
3. The good economic results
Because of the die castings sizes are accurate, the surface finish is
high, so it can be used without machine work, or the
amount of metals processing is small, not only increase the
usage rate of the metals, but also decrease the processing
equipments, furthermore, the die castings has good abrasive
resistance, insulation and permeability, so they can instead of some
partial assemble and simplify the production process, not only save
time but also save metals source.
The disadvantages of die casting method
Generally speaking, there are some defects of air holes for the die
castings, and the metal castings can not be heat-treated produced by
die casting method, the die casting method is not effective to the
concave metals, moreover, it does not suit to small volume
production, because the cost of die casting is high, and it has high
production rate, so the small volume production is not economical.
The die casting method is used widely in casing industry, nowadays,
it not only used in Zn, Al, Mg, and Cu which are non-iron alloy, but
also used in iron castings and steel castings. It used widely in all
walks of life in the national economy, such as weapons, automobile,
aerospace and TVs computers, agriculture machines, medical
equipments and so on.
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Aluminum Die Castings and Workshop