Quick answer: Single-line bending processes one bar at a time and usually supports the wider diameter range. Double-line bending processes two bars together within a narrower diameter range and can raise output on suitable repeat jobs. Choose based on the bar size and stirrup drawings you actually run, then confirm the mode-specific limits for the machine model.
Mode comparison
| Decision point | Single-line | Double-line |
|---|---|---|
| Bars processed together | One | Two, when the model and product support it |
| Diameter range | Typically wider | Typically narrower |
| Best suited to | Mixed sizes, larger diameters, varied jobs | Repeated compatible sizes and shapes |
| Output expectation | Use model and drawing-specific estimate | Potentially higher on suitable jobs; verify with a sample calculation |
Por ejemplo, published reference ranges are 4–14 mm single-line and 4–10 mm double-line for HH4-14S; the 13E reference ranges are 5–13 mm single-line and 5–10 mm double-line. Ranges are model-specific and must be checked against the final technical offer.
How double-line mode changes the workflow
Processing two bars together can increase pieces per cycle when both bars can be fed, doblado, and cut in the same sequence. It does not simply double output: alignment, wire diameter, shape geometry, bend direction, cut length, and material handling can limit the cycle. Some complex shapes or large diameters may require single-line operation, depending on the machine design.
A practical selection method
- List the bar diameters and grades used most often.
- Sort your stirrup drawings by monthly volume and complexity.
- Mark which products fall inside the model’s double-line range.
- Estimate output separately for each high-volume product.
- Compare setup time and material loading with the potential cycle gain.
When selecting between the HH4-14S y 13E stirrup bender, compare diameters, drawings, and shift targets rather than comparing headline hourly numbers alone.
Frequently asked questions
Is double-line always more productive?
No. It may help on compatible repeated jobs. Changeovers, complex shapes, large diameters, or inconsistent feedstock may reduce the advantage.
Can I use the machine’s maximum diameter in double-line mode?
Usually the double-line limit is lower. Check the mode-specific range for your exact model; HH4-14S and 13E have different limits.
What drawing should I send for confirmation?
Send a dimensioned drawing showing bar diameter, bend sequence, hook or end details, and the required cut length.
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