1. Overview of Automatic Bobbin Winding Machine
The automatic bobbin winding machine is specialized production equipment widely used to manufacture relay coils, transformer coils, inductance coils and other electronic components.
It realizes automated wire feeding, winding, wire arranging and wire cutting, greatly improving production efficiency and product uniformity compared with manual operation.
Precise wire arrangement is the core performance index of high-end coil winding machine. Orderly and compact wire layering not only enhances the electrical performance and structural stability of finished coils, but also reduces defective rates in mass production.
Whether the equipment can achieve ideal winding results depends largely on the structural design and manufacturing precision of the bobbin (wire former).
↑Appearance and finished winding product of GWSX-9-L180- D450--25075KWS (5SJS) ↓Specification
| Parameter | Specification |
|---|---|
| Number of spindles | 1 pc. |
| Maximum coil diameter | 300 mm |
| Traverser travel (wire route) | 0-180 mm |
| Applicable wire diameter | 0.1-1.5 mm (can be adjusted to 0.02 mm minimum depending on the installed tensioner) |
| Spindle rotation speed | 0-1200 rpm |
| Wire movement speed | 0-22 mm/sec |
| Standard tensioner specification | Adapted for wire diameter from 0.10 to 0.50 mm |
| Swing diameter | 0-280 mm |
| Winding type | Parallel winding, turn-to-turn winding |
| Power supply | Single-phase 220 V ± 10%, 50 Hz |
| Standard tooling | Set of tooling for fixing the bobbin on the machine (installation drawing attached) |
| Optional configuration | Servo wire tensioner available |
2. What structural conditions of bobbin are mandatory to realize precise wire arrangement?
To achieve tidy, tight and multi-layer precise wire arrangement, the bobbin or wire former must comply with the following five design standards. These rules are also the basic guidelines for making bobbin molds and hollow coil steel molds, which are indispensable for stable operation of automatic winding equipment:
The bobbin is fitted with flanges on both ends, and the flanges keep a 90° right angle with the surface of the winding shaft. Vertical flanges can effectively prevent wire displacement and slipping during high-speed winding.
Positioning grooves are carved on the winding shaft surface. The pitch of each groove is exactly equal to the actual diameter of the enameled wire. This structure firmly fixes each turn of wire on the first layer and avoids offset.
Discontinuities are set at symmetrical points on the circumference of the grooved shaft. These gaps enable smooth wire transition between adjacent grooves without scratching or extruding the wire.
A dedicated wire hiding slot is reserved at the wire inlet. It ensures there is no gap between the first turn of wire and the flange, laying a solid foundation for orderly follow-up winding.
The total width of the wire storage area is calculated as an integer multiple of the wire diameter, plus a tiny gap slightly smaller than the wire radius. When the first layer is fully wound and the machine moves to the second layer, the first turn of the new layer will be aligned on the same plane with all subsequent turns. Meanwhile, the structure keeps the whole coil tightly packed.
In short, all bobbin molds and hollow coil steel molds must strictly follow the above requirements. They are the fundamental premise to realize qualified multi-layer precise wire arrangement on automatic bobbin winding machines.
3. What are the key factors affecting wire arrangement effect?
Apart from bobbin structure, multiple factors will influence the final winding quality:
Wire tension: Constant and stable tension across the whole winding process is required. Uneven tension will lead to loose winding, wire overlapping or wire breakage.
Equipment precision: The rotating runout of the winding shaft and the positioning accuracy of the wire arranging mechanism directly determine the neatness of coils.
Material of wire: Different types of enameled copper wire, aluminum wire have different hardness and ductility, which need matched tension parameters.
4. What about Practical Case Analysis & Judgment?
We take a large oval bobbin as an example for practical assessment: This kind of large oval bobbin is made of plastic via injection molding. Due to its special shape, it is extremely difficult to control the injection molding precision.
It cannot guarantee the parallelism of two sides and the perpendicularity of the end flanges. What's more, it is technically impossible to machine standard wire positioning grooves on an oval winding surface.
Besides, the wire tension distributed over the 360° circumference of an oval bobbin is always uneven. Combining all the above problems, this type of bobbin does not possess the basic conditions for neat and precise wire arrangement.
Even with a high-performance relay coil winding machine, it is impossible to achieve completely tidy multi-layer winding.
5. What Should Be Noted When Selecting Automatic Bobbin Winding Machines & Designing Matching Bobbins?
To sum up, the matching degree between bobbin structural design and winding equipment is the core prerequisite to achieve ideal precise wire arrangement.
When purchasing automatic bobbin winding equipment and developing supporting bobbins, manufacturers shall prioritize confirming actual production needs first.
Regular right-angle flange bobbins with positioning grooves are the optimal option to maximize the precision winding performance and stably produce qualified relay & electronic coils;
meanwhile, for irregular profiles like oval bobbins, enterprises need to reasonably adjust production targets in advance, since strict neat layer winding cannot be accomplished due to structural limitations of special-shaped skeletons.
Proper pre-check on bobbin design can effectively avoid unnecessary winding defects and extra production loss caused by mismatched machine and workpiece.
If you're looking for a well-matched automatic bobbin winding machine tailored to your bobbin structure and coil production requirements, please click here to get in touch with our professional engineering team.
We provide customized machine selection guidance, bobbin structural optimization suggestion and one-stop after-sales technical support.
