Integrated Bundy Tube Straightening, Cutting, feeding And Bending Machine

II.Configuration

NOTES:It can adopt the specified brands ofaccessories

III.Equipment Composition

1.Decoiler

 This section is equipped with material shortage and absence detection features.If the material channel switches from “material present” to “no material” during either automatic or manual operation, the system will issue an alarm and automatically stop to ensure safety and prevent process interruption.

2.Straightening

The tube passes through horizontally and vertically arranged straightening rollers to correct deformation.

The straightening deformation amount can be individually adjusted according to the hardness or softness of the galvanized tube.Each straightening roller has a smooth surface and is equipped with two bearings to ensure high straightening accuracy and operational stability.

3.Chipless Cutting 

Three-part clamping die to minimize tube distortion, get smooth cutting end surface. High accuracy concentricity ensures to get good welding quality in following process. Chipless cutting with 360° rotary cutting blade and stretching with two points clamping. Straightening wheel work on the steel tube from both vertical and horizontal directions. Tube Diameter from 4-5mm is suitable for floor mounted decoiler.

4.Marking

The tube ends are marked with colors.

5.Tube End Forming 

After rotary cutting, the next process includes tube end expanding.A servo transfer unit drives dual (or multiple) expanding pins to perform the expansion sequentially.

After expansion, high-pressure nitrogen (2 MPa, 5 s, time adjustable via touch screen) is blown into the opposite tube end. Each single-station module includes front-end expanding, front-end chamfering, and rear-end nitrogen blowing functions.

6.Collecting And Feeding Unit:

The cut tubes will be placed in the silo and arranged neatly. The clamping die will hold the tube and feed it into the bender.    

Clamping dies can be matched to the pipe diameter. Positioning and feeding are precise. 

The length of the receiving frame will be designed to 28m according to the drawings.

7.Taping

To ensure alignment and consistency during multi-tube bending, an automatic taping machine is installed between the bending module and the rotary buffer module.

The machine performs in-line taping of parallel tubes, capable of wrapping 10–15 tubes simultaneously in a single taping cycle.

8.Bending Unit:

The bending station is driven by servo motors to ensure precise feeding accuracy.

Bending power is also servo-controlled, allowing freely adjustable bending angles within the operating range.

The system ensures seamless coordination with the rotary table, maintaining minimal deformation when processing large workpieces.

The bending mechanism operates with smooth startup, stable intermediate motion, and impact-free positioning at the end of bending.

9.Auxiliary Pushing and Discharging System

The auxiliary pushing system consists of left and right pushing units, driven by a single servo motor and connected through an electromagnetic clutch.

This design enables one drive to control two units, while keeping their movements independent of each other.

The rotary table is powered by an independent servo motor and synchronously linked with the dual bending

rollers, providing assisted feeding during the bending process to prevent tube deformation or dislocation.

After automatic bending is completed, a servo-driven pusher (sharing the same drive as the auxiliary pusher) automatically ejects the finished tubes from the bending platform.