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Art.070 User Guide EN 27
4.2 APPENDIX 2
BENDING WITHOUT PROBLEMS
Bending correctly with the Ercolina system.
1. Always use former and counterbending die of the correct size according to the tube to bend: for
example, if the tube external diameter is 30mm, it must be bent with a 30 mm diameter former and
30mm diameter counterbending die.
2. Minimum radius: it depends on the material to bend, its external diameter and thickness. Normally,
the minimum radius goes from 2 to 4 times the tube diameter depending on the type of material.
3. Correct tube tightening. Sufficient pressure must be applied to produce flawless bends. If flaws are
produced in the inner part of the bend even with a greater pressure, use a former with a larger
radius.
4. Verify that there is no flaw on the bent tube. In the contrary, increase the tightening force.
5. Former and counterbending die must never touch each other because the tube may break and the
machine may get damaged.
6. Use the special Ercolina grease spray to avoid excessive friction of parts in motion and to improve
results.
1 Wrinkles Inner Side Deformation
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