Process, Casting Product Development Trend
With the progress of science and technology and the vigorous
development of the foundry industry, different casting methods
have different mould for content.
In the most widely used sand mold casting, for example, mold
preparation including molding materials preparation and molding
core making two categories of work. The model used in sand
casting core making all kinds of raw materials, such as casting
sand, sand binder, and other accessories, and a mixture of sand,
their core sand, coating etc are collectively referred to as
molding material molding materials prepared by the nature of the
task is in accordance with the requirements of the castings,
metal, choose appropriate raw sand, binder and auxiliary
materials, and then according to certain proportion mixed them
into has certain properties of the sand and core sand. Commonly
used sand mixing equipment have grinding wheel sand mixer,
counter-current type sand mixing machine and blade groove type
sand mixer. The latter is designed for mixing chemical process
and the design of continuous mixing, fast.
Modelling of core making is according to casting process
requirements, in determining the good modelling method, molding
materials ready. On the basis of the The accuracy of castings
and economic effect of all the production process, mainly
depends on the procedure. In many modern foundry, core making
modelling has realized mechanization and automation. Commonly
used modelling sand core making equipment have high, medium and
low pressure molding machine, sand slinger, no cases of
shoot-squeeze molding machine, shoot core machine, cold and hot
core box machine and so on.
Casting after pouring cooling of the casting to retrieve, sprue
and riser, metal burrs, feng and die line, also adhesion of sand
mold casting casting sand, so must go through cleaning process.
For devices of this kind of job have a polishing machine, shot
blasting machine, casting riser cutting machine, etc. Sand mold
casting sand cleaning is a process with the poor working
conditions, so the choice modelling method, should be considered
as far as possible to create convenient conditions for shakeout
to clear. Some castings due to special requirements, but also
the casting post-processing, such as heat treatment, shaping,
anti-rust treatment, rough machining, etc.
1.Casting blank forming methods is more economic, more can show
it to complicated shape parts of the economy.
Such as automobile engine cylinder block and cylinder head,
Marine propeller and exquisite works of art, etc. Some difficult
to cutting the parts, such as gas turbine nickel-based alloy
parts forming without casting method.
2.The size and weight of casting parts to adapt to the range is
very wide, almost unlimited types metal.
Parts in the general mechanical properties, but also has
wear-resisting, corrosion resistant, shock absorption, such as
comprehensive performance, is other metal forming methods, such
as forging, rolling, welding, punching, etc. So using produced
by the method of casting blank parts in the machine
manufacturing industry, on the number and tonnage so far is
still the most.
3.Casting production often want to use the material with various
metals, coke, wood, plastics, gas and liquid fuels, molding
Smelting metal required equipment have to use all kinds of the
stove, with all kinds of sand mixer, sand mixing with various
molding machine molding core making, core making machine, have
clean castings with shakeout machine, shot blasting machine,
etc. And for special casting machinery and equipment and many
transportation and materials handling equipment.
4.Casting production have different characteristics with other
technology, wide adaptability, more materials and equipment will
be needed, pollute the environment.
Casting production will produce dust, harmful gases, and noise
pollution to the environment, compared with other mechanical
manufacturing process is more serious, need to take measures to
5.For casting engineers and mechanical structure design
engineer, heat treatment is a very meaningful and very high
value to improve the method of material quality, through heat
treatment can change or influence the organization and
properties of cast iron, and can obtain higher strength,
hardness, and improve the wear resistance and so on.
Because purpose is different, the kinds of heat treatment is
very much, basically can be divided into two main categories：
(1). The first category is the organization structure will not
change or through heat treatment and should not be changed.
(2). The second is the basic organizational structure change.
The first heat treatment procedure, is mainly used to eliminate
the internal stress, and the internal stress in the casting
process due to different cooling conditions and conditions.
Organization, strength and other mechanical properties, no
obvious changes due to heat treatment.
For the second heat treatment, al qaeda has had the obvious
change, can be roughly divided into five categories:
(1) the purpose is to decompose carbide, its hardness is
reduced, and improve the processing performance, for the
spherical graphite cast iron, its aim is to obtain iron group
has a very high fertility.
(2) the normalization processing: mainly used to improve or make
completely is a wave to cast iron products for mechanical
properties of uniform distribution.
(3) hardening: mainly in order to obtain a higher hardness and
abrasion strength, at the same time to the surface of the high
(4) surface hardening treatment: mainly for surface hardening
layer, at the same time, get very high surface wear-resisting
(5) precipitation hardening treatment: mainly in order to obtain
high strength and elongation is not so drastic change.
Casting product development trend is the requirement of castings
have better comprehensive performance, higher accuracy, less
allowance and more bright and clean surface. In addition, the
requirements of energy saving and society calls for recovery of
the natural environment is becoming more and more high. To meet
these requirements, a new casting alloy will be development,
smelting new technology and new equipment will appear
Foundry production of mechanization degree of automation in
improving at the same time, the more the flexible production
direction, to broaden the adaptability of different production
batch and many varieties. To save energy and the new technology
will get the priority to the development of raw materials,
produce or not produce less pollution of the new technology of
new equipment will be the first to be taken seriously. Quality
control technology in the process of testing and nondestructive
flaw detection, determination of stress, there will be a new
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