BELAN Automation Selection Guide Part 2: Differences Between Rotary, Die and Multi‑Axis Servo Bending for copper‑aluminum busbar bending machine
Choose The Right Bending Technology
The selected bending process directly determines finished‑product yield, processing efficiency and long‑term production costs. Bending mode is one of the core evaluation indicators when purchasing a copper‑aluminum busbar bending machine.
Four mainstream bending solutions are widely available on the market: die bending, standard rotary bending, servo‑driven rotary bending and multi‑axis linkage bending. These technologies differ greatly in material protection, angle accuracy, 3D forming capability, change‑over efficiency and mold investment.
For insulated copper and aluminum busbars used in new‑energy vehicles and energy‑storage systems, strict requirements are placed on scratch‑resistance and complex three‑dimensional forming. An unsuitable bending method may easily cause insulation damage, angular deviation or failure to process special‑shaped workpieces.
Working Principles of Four Mainstream Bending Methods
1. Die Bending
Die bending forms busbars through clamping force between upper and lower forming molds, which is a traditional processing method.
Its advantages include simple machine structure and stable basic bending precision, suitable for mass production of long‑term standardized parts.
Major disadvantages are obvious: custom molds are usually required for new products, resulting in high mold procurement costs and long mold‑swapping downtime. Heavy extrusion force tends to scratch or damage PA12, PVC or mica insulation layers, and material wrinkling may occur during small‑angle bending. It offers low flexibility and limited capacity for complex 3D busbar workpieces.
2. Standard Rotary Bending
Standard rotary bending pushes materials into target shapes by one set of rotary rolling units, without heavy reliance on customized molds. It supports faster product change‑over and lower tooling costs for basic flat and vertical bends.
Limited by fewer actuators and single‑function movements, this structure struggles when flat bends and vertical bends are closely spaced or workpieces contain twist bends and multi‑segment 3D profiles. Workpiece offset frequently happens without auxiliary support, restricting complex 3D forming performance.
3. Servo‑Driven Rotary Bending
Servo‑rotary bending upgrades conventional rotary mechanisms with servo drives for greatly improved angular control. It can stably produce both small‑angle and large‑angle bends with highly controllable feeding and bending motions, and causes less surface damage compared with die bending.
Most standard 3D rotary machines only rely on forward‑backward and left‑right movement of rolling heads, with no auxiliary stations. Machining difficulty rises sharply for short‑distance transitions between flat and vertical bends, and high‑difficulty special‑shaped parts are prone to forming failure.
4. Multi‑Axis Linkage Bending (BELAN 8‑Arm Structure)
BELAN copper‑aluminum busbar bending machine adopts an 8‑arm manipulator layout, equipped with two bending‑rolling units and one cutting module for multi‑axis coordinated forming.
The multi‑arm structure precisely completes flat bending, vertical bending, twist bending and other compound movements. Eight robotic arms provide multi‑point auxiliary support for complex parts, effectively suppressing busbar offset and warpage. Stable forming can still be achieved even with ultra‑short spacing between flat and vertical bends, greatly boosting the capacity for complex 3D busbars. Servo multi‑axis control ensures consistent bending angles and reduces extrusion‑caused insulation damage, while the integrated cutting unit streamlines production workflows.
Multi‑Dimension Performance Comparison
| Comparison Item | Die Bending | Standard Rotary Bending | Servo‑Rotary Bending | BELAN 8‑Arm Multi‑Axis Bending |
|---|---|---|---|---|
| Surface Protection | Highest scratch risk for insulation | Moderate protection | Minor surface damage, good protection | Best protection with multi‑point uniform support |
| Angle Machining | Angles restricted by molds | Stable for regular angles | Stable for small & large angles | Supports variable‑angle & twist‑bend profiles |
| Complex 3D Capacity | Weak, only for simple parts | Basic 2D profiles only | Simple 3D busbars available | High‑difficulty, short‑pitch multi‑bend 3D busbars |
| Change‑over & Mold Cost | Slow change‑over, high custom mold cost | Low mold cost, relatively fast switching | Low mold cost, fast parameter switching | Program‑based switch, nearly no fixture replacement |
| Precision & Automation | Mold‑dependent accuracy, low automation | Basic precision, medium automation | Servo‑controlled, high angular precision | CNC multi‑axis, high repeatability & automation |
Selection Recommendations & Inquiry
Die bending is recommended for simple, standardized workpieces with fixed specifications over long production cycles. Servo‑rotary bending is a budget‑friendly option if most of your parts are basic 2D bends.
The 8‑arm multi‑axis linkage solution delivers the most comprehensive advantages for frequently‑updated complex insulated 3D busbars with multi‑bend positions, twist bends and tight bending spacing.
No single bending structure fits all applications; the key lies in matching machine performance to your process requirements. BELAN Machinery provides professional metal forming automation solutions. If you are choosing a copper‑aluminum busbar bending machine and cannot decide between rotary bending and multi‑axis linkage bending, feel free to contact BELAN Automation.
Please send us your part drawings, material grade, insulation type, bending angles and daily output, and we will offer a free, professional process evaluation for your busbar bending project.
To get a customized bending solution, please reach out to our sales team.
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