Articles and materials

Draw tube bending process

Draw tube bending means the bending of the tube around of the bending die with the use of bending arm of tube bending machine. Tube bending tools are made according to the tube sizes and radius of the required bends. All the movements usually are the same for every manufacturer of standard tube bending machine with the possibility of mandrel bending (mandreless bending machine construction has some differences). All the movements could be controlled with different ways (from manual or hydraulic to servo-drived) but the specification of movements is equal.
To show the simple bending of tube we prepared the draw bending visualisation which could be easy to understand for more knowledge of the tube bending process. Please note that because it is one bend the rotation of tube to bend in 3D mode as well as mandrel loading-unloading movement is not presented. For sure if you need better explanation you can contact us.



Draw tube bending process All units are in idle position.
Tube is loaded on the machine and clamped with the collet of the carriage.
All clamps are retracted to prevent any collisions.
Draw tube bending process Clamp (or front clamp) moves toward to the bending die center to clamp the tube inside the clamp and clamp die (part of bending die).
Tube is securely fixed for bending process.
Area of clamping usually is equal to min. straight part to have between the bends.
Draw tube bending process Pressure die (or guide) moves to contact with the tube. The purpose of pressure die to follow the tube during the bending process.
Pressure die could be moved simultaneously with the clamp to save the time of operations or after clamp movement.
Draw tube bending process Bending arm with installed bending die performs the necessary rotation (the degree for angle of bending) for the tube bending. Rotation is performed around the center of bending die shaft which is "0" point.
Carriage with the holded tube moves forward or follows the tube without additional force.
Pressure die moves forward to follow the tube and prevents inclination of the part after the bending zone.
Draw tube bending process Clamp is retraced to free the tube after the bending. The purpose of this action to prevent collisions with the tube and the tooling.
Draw tube bending process Pressure die is retracted.
Pressure die could be moved simultaneously with the clamp to save the time of operations or after clamp movement.
Draw tube bending process Carriage with the holded tube moves forward for start of new bend or finish of the operations.
This moving helps to prevent collisions with the tube and the tooling.
Draw tube bending process Bending arm with installed bending die performs to the the primary position at 0 degrees.
Now the next bend could be initiated or the operator can hold the tube and unlock the clamping collet to unload the part.


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