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Hydraulic Warping Head GR220
Hydraulic warping
head is used for the hydraulic capstan
in tugboats. The material is mainly grey
cast iron
BS1452 GR220.
There are some iron foundries who have
good experience to produce these capstan
heads.
Dandong Foundry has made many
warping head for the clients overseas.
Herein, I will talk about some quality
issues about them.
Hydraulic warping heads are not
difficult to manufacture since they have
a suitable structure for casting
process, however, as a buyer, you still
need to notice some aspects as
following:
1. Dynamic balance
Dynamic balancing is important for the
warping heads although their rotation
rate is not high. In order to keep the
good dynamic balancing, you should
require your suppliers to use the resin
sand casting process to produce them. By
this casting process, the dimensions and
dynamic balance can be kept.
2. Material Physical
Properties
Since the hydraulic warping head has to
take heavy tensile, so their material
should have good tensile strength and
hardness. Otherwise, it will cause the
potential danger in your application.
Most of iron foundries in China have the
capability to do the tensile strength
and hardness test. So, these issues are
not difficult for suppliers, but just
need them to take them seriously.
Some clients may
choose the ductile iron (SG) as the
material considering the higher tensile
strength and better physical properties.
Such as ductile iron
ASTM A536
60-40-18 or 65-45-12. This is correct
choice. However, if grey iron can meet
your tensile strength requirement, you
do not need to choose the ductile iron
since ductile iron is more costly.
3. Surface Quality
Since most of the surfaces are rough
surfaces, so as a buyer, you should ask
your suppliers to grind them carefully.
Remove all the sharp edges and burrs,
and grind them smoothly. Welding should
be permitted, but the welding positions
should not affect the use.
4. Coating and
Painting
The suppliers should do the anti-rust
primer painting before delivery.
Normally, our clients will paint the
finish painting by themselves, but we
can do the finish painting if you need.
As I said, the hydraulic warping heads
are not difficult to produce, just need
the careful works of the manufacturers.
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