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| The
low pressure cast urethane process
offers a very economical method to
bond urethane to steel or aluminum.
The bond can either be mechanical
or chemical. The choice of bonding
process depends on the design of the
metal insert the urethane is to be
bonded too. In a mechanical bond there
will be holes in the metal insert
where the liquid urethane will flow
through the holes and set, this will
fully encapsulate the metal with urethane
insert. In the chemical bonding process
an adhesive is sprayed on to the metal
part as the urethane sets the adhesive
chemically bonds the two materials
together. Do to the less complex tooling
involved in low pressure urethane
molding steel inserts can be easily
incorporated without high tooling
investments or tight insert tolerancing
as within some other processes. The
insert can be as complicated as a
metal stamping or as simple as a bolt/
nut molded in to the urethane. |
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| Mechanical
Bonding |
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| Click Picture
For Full Size Image |
Click Picture
For Full Size Image |
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| Raw
metal insert. |
Cross
section view showing urethane
mechanically bonded through
the metal
insert. |
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| Chemical
Bonding |
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| Click For Full
Size Image |
Click For Full
Size Image |
Click For Full
Size Image |
Click For Full
Size Image |
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| Metal
insert is wheelabrated
to remove any dirt/ oxidation
from the part to ensure
a good bond with the adhesive. |
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| Metal
insert is sprayed with
adhesive. |
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| Finished
part - urethane bonded
to metal insert . |
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