China's economy in rapid development, makes China's industry
also fly boom, casting as China's industrial essential part of
course is often taken for granted and to develop up, casting can
be divided into large ductile casting, aluminum casting, copper
casting and so on the many kinds of industrial applications, but
the most widely used is the most large ductile casting the.
Large ductile casting as a large mechanical main parts, its
quality is very important, decided to large ductile casting
quality of the main criteria is its casting process, large
machine tool castings including is by lathe, milling machine,
the planer, the grinding machine, CNC machine tools, etc.
Large ductile casting is often a single small batch production
no ready tooling sand box greater investment especially CNC
machine tool bed structure shape than force complicated in shape
production, sand core fastening, such as modelling operation
there is a big difficulty, its material requirements has good
accuracy stability, compressive strength and shock resistance
good cutting performance and castability its hardness
requirements 180241 HB hardness difference HB acuities 35.
Casting the biggest characteristic is to guide a long in general
a few meters or more than ten meters very can easily lead to
bending deformation and guide is very large and thick in general
and ~ 100 mm guide easy to produce tissue defect, especially 10
m long guide to ensure that no hole blister is more difficult.
Improve the immanent quality of castings. Metal heat treatment
is one of the important mechanical manufacturing technology,
large ductile casting must after heat treatment punishment
ability to improve their performance. Compared with other
processing technology, heat treatment punish generally does not
change the shape of the workpiece and the chemical composition
of the whole, but through the change of the internal
microstructure, or change the surface chemical composition, gift
or improve the performance, its characteristic is to improve the
With China's rapid economic growth and the recovery of the
economy, the international market is large ductile casting
resources in short supply, prices, in order to speed up the
development of large scale ductile casting localization, break
through the bottleneck of heavy equipment manufacturing
industry, avoid are, the domestic large ductile casting main
manufacturers began to speed up the pace of development.
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