Internal and External Spring for Bending Pipe

These coiled springs sit snugly inside the end of the tube or pipe to be bent. As the bend commences and the walls collapse, the spring expands forcefully - pressing back against the interior surface. This creates counterforce to support the otherwise weakening walls.

Benefits include:

• Controlled elasticity - The spring footing conforms smoothly along the bend while robust outward pressure prevents uncontrolled dimpling, flattening or wrinkles.
• Reduced thinning - The supported walls maintain close to original thickness around the fulcrum without excessive thinning or tearing.
• Tighter radii bends - Compensates for thinning and wrinkling to permit tighter turn angles and smaller diameters than otherwise possible.
• Wide applicability - Available for tube/pipe widths from 1/8 inch to 2 inches. Suitable for copper, mild steel, stainless commercial steel, exhaust piping and more. Can assist hand benders, scroll bending machines and tube manipulators alike.

These compact compression springs encircle the pipe exterior at the desired bend point before manipulation. As the pipe gets angled, the sleeve springs compress - creating inward pressure against the walls.

This addresses:

• Wall weak spots - Counteracts tendency for exterior stretching and thinning at the bend apex.
• Wrinkle flattening - Presses any developing ripples back flush with surrounding surface.
• Fold/crease prevention - Solid sleeve leaves no exterior gaps for walls to fold into at peak bend angles.
• Concentricity - Eliminates egg-shaping through bidirectional compression pressure.
• Spring sleevesallow similar tight radius possibilities as internal expander springs with enhanced convenience.
• Quick positioning - Slide sleeves over any section mid-run without needing preset tube insertion points.
• Interchangeability - Switch or add sleeves in any sequence without axis or directional limits.
• Versatile pairings - Pair with any hand or machine tube bending process. Use multiple sleeves in series on a single tube.

Spring Wire Material

Materials like carbon spring steel and stainless steel which tolerate repeated compression without fracturing or taking permanent set provide the highest longevity and performance over thousands of bend cycles.

Coating treatments add further surface protection across continual abrasive friction contact with piping.

Spring Index

The ratio between coil diameter vs. thickness affects flexibility and spacing. Tighter index (under 6) prevents exterior gaps while higher index (8-12) allows greater compression ranges to tune progressive bending resistance.

Number of Active Coils

More coils exert distributed pressures for a smoother gradient of support across the entire bend instead of concentrated points of isolated force.

Closed and Ground Ends

Closed coil ends containing the expansion along with precision ground flat surfaces ensure the coil maintains stable footing along the bend without slippage or misaligned torque forces during manipulation.

Whether confronted by a few gentle curves or multi-plane complex bends, appropriate spring assisted tooling improves efficiency, control and precision - preventing costly rework. Matching tube thickness and machine parameters to optimal spring type and performance specifications (determined through the provided guidance) empowers benders to successfully conquer more diverse and demanding challenges. This opens new realms of possibility around the elegance and exactitude of fabricated pipe designs. Over years of continual usage, spring-enhanced adaptability and precision will prove well worth the meager investment by multiplying productivity and minimizing wasted materials and effort.

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