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Art.070 User Guide EN 28
4.3 APPENDIX 3
BENDING TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
Wrinkles inner side Low pressure on tube Apply more pressure on the tube (the
maximum pressure is obtained when
former and counterbending die are
almost touching each other)
Wrinkles inner side Counterbending die and former
touch each other
Move them apart to avoid contact
Wrinkles inner side Counterbending die and former
touch each other
Worn counterbending die. Replace it
with a new one
Wrinkles inner side Former radius is too small Use a larger radius former
Excessive tube crushing
(ovalization)
Excessive tube pressure Decrease force or use a larger radius
former
Excessive curve starting and ending
compression
Excessive tube pressure Decrease force or use larger radius
former
The machine is not able to bend a
tube because of its chemical
composition and it is overloaded
Tube with chemical characteristics
exceeding machine capacity
Try bending using the special
Ercolina® roll
For any other technical problem regarding bending operations contact your Ercolina® dealer.
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