Processing on surface
The swaging and flat-grinding process to improve the mechanical property. Auger with one spiral wire on the surface is available for Archimedes screw.
An additional filar twisted on top of a cable tube to create an auger screw-type component.
Decreasing O.D. while maintaining inner lumen and stiffness by forging surface, can improve the elongation resistance.
Grinding on the surface in the whole length. It improves the flexibility of the metal tubes without decreasing the inner lumen.
We can put a mark to make clear the position of the metal tubing.
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