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Orbital Riveting is
a cold forming process in which an orbiting tool held at a fixed
angle (3 to 6 degrees) is used to progressively move malleable
material into a desired, predetermined shape. |
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Orbital Riveting is
also called spinning, radial riveting, brackering, spin
riveting, peening or noiseless riveting. |
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Orbital Riveting is
used to head, swage, crown, flare or draw a column or projection
of malleable material and is often used in fastening and
assembly to produce a high quality head form - to rivet without
disruption of component material grain structure. |
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Similar to impact
or compression forming and riveting, the axial load is reduced
due to the mechanical advantage of the angular orbiting tool and
progressive forming action. The axial load required is reduced
up to 80% with orbital forming. |
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This reduction in
compressive axial load has several advantages: |
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Many
Applications |
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- Most of the work done during
orbital riveting occurs at the orbiting tool’s line of
contact. Internal stress loads, caused by a high compressive
axial load applied to the assembled components, are greatly
reduced. Forming work is focused. Fastener sees less stress.
Mating parts experience less stress.
- Orbital Riveting produces a
smooth finished surface. In some applications, it has been
used to eliminate cracks that could not be avoided with impact
riveting. See crack free rivet clinches.
- Cold head forming without
bending or swelling of the fastener shank is possible since
the forming load does not typically exceed the column strength
of the fastener.
- Less axial load required for
forming means much lighter press requirements. On larger
parts, equipment tonnage, floor space and cost are greatly
reduced.
- Lower forming force
requirements means less rigid fixturing is required, reducing
initial tooling costs.
- Due to lower forces, tools and
fixtures last longer.
- As one of the orbital riveting
synonyms (noiseless riveting) implies, orbital riveting is
much quieter than impact forming or peening.
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