The following points are decisive the selection surface finish:
- properties the contact material
- environmental conditions (for example dampness, aggressive industrial
environments, etc. Contact
pressure plays immeasurably important role determining the useful life
and handling properties contacts. Additional surface
treatment required protect them against environmental influences.)
- frequency insertion
- low manufacturing costs
Why surface protection important? constant low contact resistance is
fundamental maintaining the quality the contact. The contact material must fulfil wide range requirements. the case multicontact connectors,
the force required connect and disconnect them can become great that
it can longer done hand.Insert 175
4.
.
The following are proven techniques for the surface finishing industrial
connectors. Its value depends on
various factors:
- smoothness surface
- sufficient contact pressure
- point contact free interfering oxidized layers
As far contact surface concerned, balance must found between
function and economic considerations (manufacturing costs). Over a
long period time, corrosion makes contacts unusable.
Some these requirements are follows:
- the material should conduct electrical current well
- should mechanically strong (abrasion-proof)
- should have good elastic properties (female contact)
- manufacturers should able process easily (manufacturing)
- electricians should able form easily (for example crimping)
- the material should resistant environmental influences
A suitable brass alloy fulfils most these requirements quite well.7 Contact Finish
Nearly all contacts for industrial connectors are made copper alloys
(brass)
