Made in Dandong Foundry
These large belt
pulley are from 500kg to 2tons, which are used for
the large rock crushers. We made them for our
clients in Germany.
large belt pulley is very difficult to make
the raw castings very well, The material is ductile
cast iron GGG40. They are about one ton weight, and
over one meter diameter. In order to keep all the
surfaces away from any small sand holes, air holes
and shrinkage. We have to take the special pouring
process to keep the enough liquid iron to replenish
the shrinkage, at the same time, we have to keep the
high temperature to reduce the cooling time for the
iron. We used about half of year and waste about 15
tons cast iron to test them. Finally, we succeeded.
We can make the very well, and the defective rate is
very low by the improved casting process. By the
way, the resin sand casting process is very
necessary for this pulley. The green sand can not
guarantee the surface quality and dimensional
requirements. When the belt pulley is too large, the
inter stress is very large, so the green sand is not
strong enough to hold it.
By the way, the
dynamic balance is also very necessary for them.